/*
 * meli
 *
 * Copyright 2017-2018 Manos Pitsidianakis
 *
 * This file is part of meli.
 *
 * meli is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * meli is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with meli. If not, see <http://www.gnu.org/licenses/>.
 */

use super::EntryStrings;
use super::*;
use crate::components::PageMovement;
use crate::jobs::JoinHandle;
use std::cmp;
use std::iter::FromIterator;

macro_rules! address_list {
    (($name:expr) as comma_sep_list) => {{
        let mut ret: String =
            $name
                .into_iter()
                .fold(String::new(), |mut s: String, n: &Address| {
                    s.extend(n.to_string().chars());
                    s.push_str(", ");
                    s
                });
        ret.pop();
        ret.pop();
        ret
    }};
}

macro_rules! row_attr {
    ($color_cache:expr, $even: expr, $unseen:expr, $highlighted:expr, $selected:expr  $(,)*) => {{
        ThemeAttribute {
            fg: if $highlighted {
                if $even {
                    $color_cache.even_highlighted.fg
                } else {
                    $color_cache.odd_highlighted.fg
                }
            } else if $selected {
                if $even {
                    $color_cache.even_selected.fg
                } else {
                    $color_cache.odd_selected.fg
                }
            } else if $unseen {
                if $even {
                    $color_cache.even_unseen.fg
                } else {
                    $color_cache.odd_unseen.fg
                }
            } else if $even {
                $color_cache.even.fg
            } else {
                $color_cache.odd.fg
            },
            bg: if $highlighted {
                if $even {
                    $color_cache.even_highlighted.bg
                } else {
                    $color_cache.odd_highlighted.bg
                }
            } else if $selected {
                if $even {
                    $color_cache.even_selected.bg
                } else {
                    $color_cache.odd_selected.bg
                }
            } else if $unseen {
                if $even {
                    $color_cache.even_unseen.bg
                } else {
                    $color_cache.odd_unseen.bg
                }
            } else if $even {
                $color_cache.even.bg
            } else {
                $color_cache.odd.bg
            },
            attrs: if $highlighted {
                if $even {
                    $color_cache.even_highlighted.attrs
                } else {
                    $color_cache.odd_highlighted.attrs
                }
            } else if $selected {
                if $even {
                    $color_cache.even_selected.attrs
                } else {
                    $color_cache.odd_selected.attrs
                }
            } else if $unseen {
                if $even {
                    $color_cache.even_unseen.attrs
                } else {
                    $color_cache.odd_unseen.attrs
                }
            } else if $even {
                $color_cache.even.attrs
            } else {
                $color_cache.odd.attrs
            },
        }
    }};
}

/// A list of all mail (`Envelope`s) in a `Mailbox`. On `\n` it opens the `Envelope` content in a
/// `MailView`.
#[derive(Debug)]
pub struct PlainListing {
    /// (x, y, z): x is accounts, y is mailboxes, z is index inside a mailbox.
    cursor_pos: (AccountHash, MailboxHash, usize),
    new_cursor_pos: (AccountHash, MailboxHash, usize),
    length: usize,
    sort: (SortField, SortOrder),
    subsort: (SortField, SortOrder),
    rows: RowsState<(ThreadHash, EnvelopeHash)>,
    /// Cache current view.
    data_columns: DataColumns<4>,

    #[allow(clippy::type_complexity)]
    search_job: Option<(String, JoinHandle<Result<SmallVec<[EnvelopeHash; 512]>>>)>,
    filter_term: String,
    filtered_selection: Vec<EnvelopeHash>,
    filtered_order: HashMap<EnvelopeHash, usize>,
    local_collection: Vec<EnvelopeHash>,
    /// If we must redraw on next redraw event
    dirty: bool,
    force_draw: bool,
    /// If `self.view` exists or not.
    focus: Focus,
    view: MailView,
    color_cache: ColorCache,
    movement: Option<PageMovement>,
    modifier_active: bool,
    modifier_command: Option<Modifier>,
    id: ComponentId,
}

impl MailListingTrait for PlainListing {
    fn row_updates(&mut self) -> &mut SmallVec<[EnvelopeHash; 8]> {
        &mut self.rows.row_updates
    }

    fn selection(&mut self) -> &mut HashMap<EnvelopeHash, bool> {
        &mut self.rows.selection
    }

    fn get_focused_items(&self, _context: &Context) -> SmallVec<[EnvelopeHash; 8]> {
        let is_selection_empty: bool = !self
            .rows
            .selection
            .values()
            .cloned()
            .any(std::convert::identity);
        if is_selection_empty {
            return self
                .get_env_under_cursor(self.cursor_pos.2)
                .into_iter()
                .collect::<_>();
        }
        SmallVec::from_iter(
            self.rows
                .selection
                .iter()
                .filter(|(_, &v)| v)
                .map(|(k, _)| *k),
        )
    }

    /// Fill the `self.data_columns` `CellBuffers` with the contents of the account mailbox the user has
    /// chosen.
    fn refresh_mailbox(&mut self, context: &mut Context, force: bool) {
        self.dirty = true;
        let old_cursor_pos = self.cursor_pos;
        if !(self.cursor_pos.0 == self.new_cursor_pos.0
            && self.cursor_pos.1 == self.new_cursor_pos.1)
        {
            self.cursor_pos.2 = 0;
            self.new_cursor_pos.2 = 0;
        }
        self.cursor_pos.1 = self.new_cursor_pos.1;
        self.cursor_pos.0 = self.new_cursor_pos.0;

        self.color_cache = ColorCache {
            even: crate::conf::value(context, "mail.listing.plain.even"),
            odd: crate::conf::value(context, "mail.listing.plain.odd"),
            even_unseen: crate::conf::value(context, "mail.listing.plain.even_unseen"),
            odd_unseen: crate::conf::value(context, "mail.listing.plain.odd_unseen"),
            even_highlighted: crate::conf::value(context, "mail.listing.plain.even_highlighted"),
            odd_highlighted: crate::conf::value(context, "mail.listing.plain.odd_highlighted"),
            even_selected: crate::conf::value(context, "mail.listing.plain.even_selected"),
            odd_selected: crate::conf::value(context, "mail.listing.plain.odd_selected"),
            tag_default: crate::conf::value(context, "mail.listing.tag_default"),
            theme_default: crate::conf::value(context, "theme_default"),
            ..self.color_cache
        };
        if !context.settings.terminal.use_color() {
            self.color_cache.highlighted.attrs |= Attr::REVERSE;
            self.color_cache.tag_default.attrs |= Attr::REVERSE;
            self.color_cache.even_highlighted.attrs |= Attr::REVERSE;
            self.color_cache.odd_highlighted.attrs |= Attr::REVERSE;
        }

        // Get mailbox as a reference.
        //
        match context.accounts[&self.cursor_pos.0].load(self.cursor_pos.1) {
            Ok(()) => {}
            Err(_) => {
                let message: String =
                    context.accounts[&self.cursor_pos.0][&self.cursor_pos.1].status();
                self.data_columns.columns[0] =
                    CellBuffer::new_with_context(message.len(), 1, None, context);
                self.length = 0;
                write_string_to_grid(
                    message.as_str(),
                    &mut self.data_columns.columns[0],
                    self.color_cache.theme_default.fg,
                    self.color_cache.theme_default.bg,
                    self.color_cache.theme_default.attrs,
                    ((0, 0), (message.len().saturating_sub(1), 0)),
                    None,
                );
                return;
            }
        }
        self.local_collection = context.accounts[&self.cursor_pos.0]
            .collection
            .get_mailbox(self.cursor_pos.1)
            .iter()
            .cloned()
            .collect();
        let env_lck = context.accounts[&self.cursor_pos.0]
            .collection
            .envelopes
            .read()
            .unwrap();
        let sort = self.sort;
        self.local_collection.sort_by(|a, b| match sort {
            (SortField::Date, SortOrder::Desc) => {
                let ma = &env_lck[a];
                let mb = &env_lck[b];
                mb.date().cmp(&ma.date())
            }
            (SortField::Date, SortOrder::Asc) => {
                let ma = &env_lck[a];
                let mb = &env_lck[b];
                ma.date().cmp(&mb.date())
            }
            (SortField::Subject, SortOrder::Desc) => {
                let ma = &env_lck[a];
                let mb = &env_lck[b];
                ma.subject().cmp(&mb.subject())
            }
            (SortField::Subject, SortOrder::Asc) => {
                let ma = &env_lck[a];
                let mb = &env_lck[b];
                mb.subject().cmp(&ma.subject())
            }
        });
        let items = Box::new(self.local_collection.clone().into_iter())
            as Box<dyn Iterator<Item = EnvelopeHash>>;

        self.redraw_list(context, items);
        drop(env_lck);

        if let Some(env_hash) = self.get_env_under_cursor(self.cursor_pos.2) {
            let temp = (self.new_cursor_pos.0, self.new_cursor_pos.1, env_hash);
            if !force && old_cursor_pos == self.new_cursor_pos {
                self.view.update(temp, context);
            } else if self.unfocused() {
                self.view = MailView::new(temp, None, None, context);
            }
        }
    }

    fn redraw_threads_list(
        &mut self,
        context: &Context,
        items: Box<dyn Iterator<Item = ThreadHash>>,
    ) {
        let account = &context.accounts[&self.cursor_pos.0];
        let threads = account.collection.get_threads(self.cursor_pos.1);
        let roots = items
            .filter_map(|r| threads.groups[&r].root().map(|r| r.root))
            .collect::<_>();
        let thread_nodes: &HashMap<ThreadNodeHash, ThreadNode> = threads.thread_nodes();
        let env_hash_iter = Box::new(
            threads
                .threads_group_iter(roots)
                .filter_map(|(_, thread_node_hash, _)| {
                    let thread_node = &thread_nodes[&thread_node_hash];

                    thread_node.message()
                })
                .collect::<SmallVec<[EnvelopeHash; 2048]>>()
                .into_iter(),
        ) as Box<dyn Iterator<Item = EnvelopeHash>>;
        self.redraw_list(context, env_hash_iter);
    }
}

impl ListingTrait for PlainListing {
    fn coordinates(&self) -> (AccountHash, MailboxHash) {
        (self.new_cursor_pos.0, self.new_cursor_pos.1)
    }

    fn set_coordinates(&mut self, coordinates: (AccountHash, MailboxHash)) {
        self.new_cursor_pos = (coordinates.0, coordinates.1, 0);
        self.focus = Focus::None;
        self.view = MailView::default();
        self.filtered_selection.clear();
        self.filtered_order.clear();
        self.filter_term.clear();
        self.rows.row_updates.clear();
    }

    fn highlight_line(&mut self, grid: &mut CellBuffer, area: Area, idx: usize, context: &Context) {
        let i = if let Some(i) = self.get_env_under_cursor(idx) {
            i
        } else {
            // self.length == 0
            return;
        };

        let account = &context.accounts[&self.cursor_pos.0];
        let envelope: EnvelopeRef = account.collection.get_env(i);

        let row_attr = row_attr!(
            self.color_cache,
            idx % 2 == 0,
            !envelope.is_seen(),
            self.cursor_pos.2 == idx,
            self.rows.selection[&i]
        );

        let (upper_left, bottom_right) = area;
        let x = get_x(upper_left)
            + self.data_columns.widths[0]
            + self.data_columns.widths[1]
            + self.data_columns.widths[2]
            + 3 * 2;

        for c in grid.row_iter(
            get_x(upper_left)..(get_x(bottom_right) + 1),
            get_y(upper_left),
        ) {
            grid[c]
                .set_fg(row_attr.fg)
                .set_bg(row_attr.bg)
                .set_attrs(row_attr.attrs);
        }
        copy_area(
            grid,
            &self.data_columns.columns[3],
            (set_x(upper_left, x), bottom_right),
            (
                (0, idx),
                pos_dec(self.data_columns.columns[3].size(), (1, 1)),
            ),
        );
        for c in grid.row_iter(x..get_x(bottom_right), get_y(upper_left)) {
            grid[c].set_bg(row_attr.bg).set_attrs(row_attr.attrs);
        }
    }

    /// Draw the list of `Envelope`s.
    fn draw_list(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) {
        if self.cursor_pos.1 != self.new_cursor_pos.1 || self.cursor_pos.0 != self.new_cursor_pos.0
        {
            self.refresh_mailbox(context, false);
        }
        let upper_left = upper_left!(area);
        let bottom_right = bottom_right!(area);
        if self.length == 0 {
            clear_area(grid, area, self.color_cache.theme_default);
            copy_area(
                grid,
                &self.data_columns.columns[0],
                area,
                ((0, 0), pos_dec(self.data_columns.columns[0].size(), (1, 1))),
            );
            context.dirty_areas.push_back(area);
            return;
        }
        let rows = get_y(bottom_right) - get_y(upper_left) + 1;
        if rows == 0 {
            return;
        }

        if let Some(mvm) = self.movement.take() {
            match mvm {
                PageMovement::Up(amount) => {
                    self.new_cursor_pos.2 = self.new_cursor_pos.2.saturating_sub(amount);
                }
                PageMovement::PageUp(multiplier) => {
                    self.new_cursor_pos.2 = self.new_cursor_pos.2.saturating_sub(rows * multiplier);
                }
                PageMovement::Down(amount) => {
                    if self.new_cursor_pos.2 + amount + 1 < self.length {
                        self.new_cursor_pos.2 += amount;
                    } else {
                        self.new_cursor_pos.2 = self.length - 1;
                    }
                }
                PageMovement::PageDown(multiplier) => {
                    if self.new_cursor_pos.2 + rows * multiplier + 1 < self.length {
                        self.new_cursor_pos.2 += rows * multiplier;
                    } else if self.new_cursor_pos.2 + rows * multiplier > self.length {
                        self.new_cursor_pos.2 = self.length - 1;
                    } else {
                        self.new_cursor_pos.2 = (self.length.saturating_sub(1) / rows) * rows;
                    }
                }
                PageMovement::Right(_) | PageMovement::Left(_) => {}
                PageMovement::Home => {
                    self.new_cursor_pos.2 = 0;
                }
                PageMovement::End => {
                    self.new_cursor_pos.2 = self.length.saturating_sub(1);
                }
            }
        }

        let prev_page_no = (self.cursor_pos.2).wrapping_div(rows);
        let page_no = (self.new_cursor_pos.2).wrapping_div(rows);

        let top_idx = page_no * rows;

        /* If cursor position has changed, remove the highlight from the previous position and
         * apply it in the new one. */
        if self.cursor_pos.2 != self.new_cursor_pos.2 && prev_page_no == page_no {
            let old_cursor_pos = self.cursor_pos;
            self.cursor_pos = self.new_cursor_pos;
            for &(idx, highlight) in &[(old_cursor_pos.2, false), (self.new_cursor_pos.2, true)] {
                if idx >= self.length {
                    continue; //bounds check
                }
                let new_area = nth_row_area(area, idx % rows);
                self.data_columns
                    .draw(grid, idx, self.cursor_pos.2, grid.bounds_iter(new_area));
                if highlight {
                    let row_attr = row_attr!(self.color_cache, idx % 2 == 0, false, true, false);
                    change_colors(grid, new_area, row_attr.fg, row_attr.bg);
                } else if let Some(row_attr) = self.rows.row_attr_cache.get(&idx) {
                    change_colors(grid, new_area, row_attr.fg, row_attr.bg);
                }
                context.dirty_areas.push_back(new_area);
            }
            return;
        } else if self.cursor_pos != self.new_cursor_pos {
            self.cursor_pos = self.new_cursor_pos;
        }
        if self.new_cursor_pos.2 >= self.length {
            self.new_cursor_pos.2 = self.length - 1;
            self.cursor_pos.2 = self.new_cursor_pos.2;
        }

        /* Page_no has changed, so draw new page */
        _ = self
            .data_columns
            .recalc_widths((width!(area), height!(area)), top_idx);
        clear_area(grid, area, self.color_cache.theme_default);
        /* copy table columns */
        self.data_columns
            .draw(grid, top_idx, self.cursor_pos.2, grid.bounds_iter(area));
        /* apply each row colors separately */
        for i in top_idx..(top_idx + height!(area)) {
            if let Some(row_attr) = self.rows.row_attr_cache.get(&i) {
                change_colors(grid, nth_row_area(area, i % rows), row_attr.fg, row_attr.bg);
            }
        }

        /* highlight cursor */
        let row_attr = row_attr!(
            self.color_cache,
            self.cursor_pos.2 % 2 == 0,
            false,
            true,
            false
        );
        change_colors(
            grid,
            nth_row_area(area, self.cursor_pos.2 % rows),
            row_attr.fg,
            row_attr.bg,
        );

        /* clear gap if available height is more than count of entries */
        if top_idx + rows > self.length {
            clear_area(
                grid,
                (
                    pos_inc(upper_left, (0, self.length - top_idx)),
                    bottom_right,
                ),
                self.color_cache.theme_default,
            );
        }
        context.dirty_areas.push_back(area);
    }

    fn filter(
        &mut self,
        filter_term: String,
        results: SmallVec<[EnvelopeHash; 512]>,
        context: &Context,
    ) {
        if filter_term.is_empty() {
            return;
        }

        self.length = 0;
        self.filtered_selection.clear();
        self.filtered_order.clear();
        self.filter_term = filter_term;
        self.rows.row_updates.clear();
        for v in self.rows.selection.values_mut() {
            *v = false;
        }

        let account = &context.accounts[&self.cursor_pos.0];
        for env_hash in results {
            if !account.collection.contains_key(&env_hash) {
                continue;
            }
            if self.filtered_order.contains_key(&env_hash) {
                continue;
            }
            if self.rows.contains_env(env_hash) {
                self.filtered_selection.push(env_hash);
                self.filtered_order
                    .insert(env_hash, self.filtered_selection.len() - 1);
            }
        }
        if !self.filtered_selection.is_empty() {
            self.new_cursor_pos.2 =
                std::cmp::min(self.filtered_selection.len() - 1, self.cursor_pos.2);
        } else {
            self.data_columns.columns[0] = CellBuffer::new_with_context(0, 0, None, context);
        }
        self.redraw_list(
            context,
            Box::new(self.filtered_selection.clone().into_iter())
                as Box<dyn Iterator<Item = EnvelopeHash>>,
        );
    }

    fn unfocused(&self) -> bool {
        !matches!(self.focus, Focus::None)
    }

    fn set_modifier_active(&mut self, new_val: bool) {
        self.modifier_active = new_val;
    }

    fn set_modifier_command(&mut self, new_val: Option<Modifier>) {
        self.modifier_command = new_val;
    }

    fn modifier_command(&self) -> Option<Modifier> {
        self.modifier_command
    }

    fn set_movement(&mut self, mvm: PageMovement) {
        self.movement = Some(mvm);
        self.set_dirty(true);
    }

    fn set_focus(&mut self, new_value: Focus, context: &mut Context) {
        match new_value {
            Focus::None => {
                self.view
                    .process_event(&mut UIEvent::VisibilityChange(false), context);
                self.dirty = true;
                /* If self.rows.row_updates is not empty and we exit a thread, the row_update events
                 * will be performed but the list will not be drawn. So force a draw in any case.
                 * */
                self.force_draw = true;
            }
            Focus::Entry => {
                if let Some(env_hash) = self.get_env_under_cursor(self.cursor_pos.2) {
                    let temp = (self.cursor_pos.0, self.cursor_pos.1, env_hash);
                    self.view = MailView::new(temp, None, None, context);
                    self.force_draw = true;
                    self.dirty = true;
                    self.view.set_dirty(true);
                }
            }
            Focus::EntryFullscreen => {
                self.dirty = true;
                self.view.set_dirty(true);
            }
        }
        self.focus = new_value;
    }

    fn focus(&self) -> Focus {
        self.focus
    }
}

impl fmt::Display for PlainListing {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "mail")
    }
}

impl PlainListing {
    pub fn new(coordinates: (AccountHash, MailboxHash)) -> Box<Self> {
        Box::new(PlainListing {
            cursor_pos: (0, 1, 0),
            new_cursor_pos: (coordinates.0, coordinates.1, 0),
            length: 0,
            sort: (Default::default(), Default::default()),
            subsort: (SortField::Date, SortOrder::Desc),
            rows: RowsState::default(),
            local_collection: Vec::new(),
            filter_term: String::new(),
            search_job: None,
            filtered_selection: Vec::new(),
            filtered_order: HashMap::default(),
            data_columns: DataColumns::default(),
            dirty: true,
            force_draw: true,
            focus: Focus::None,
            view: MailView::default(),
            color_cache: ColorCache::default(),
            movement: None,
            modifier_active: false,
            modifier_command: None,
            id: ComponentId::new_v4(),
        })
    }

    fn make_entry_string(&self, e: &Envelope, context: &Context) -> EntryStrings {
        let mut tags = String::new();
        let mut colors = SmallVec::new();
        let account = &context.accounts[&self.cursor_pos.0];
        if account.backend_capabilities.supports_tags {
            let tags_lck = account.collection.tag_index.read().unwrap();
            for t in e.labels().iter() {
                if mailbox_settings!(
                    context[self.cursor_pos.0][&self.cursor_pos.1]
                        .tags
                        .ignore_tags
                )
                .contains(t)
                    || account_settings!(context[self.cursor_pos.0].tags.ignore_tags).contains(t)
                    || context.settings.tags.ignore_tags.contains(t)
                    || !tags_lck.contains_key(t)
                {
                    continue;
                }
                tags.push(' ');
                tags.push_str(tags_lck.get(t).as_ref().unwrap());
                tags.push(' ');
                colors.push(
                    mailbox_settings!(context[self.cursor_pos.0][&self.cursor_pos.1].tags.colors)
                        .get(t)
                        .cloned()
                        .or_else(|| {
                            account_settings!(context[self.cursor_pos.0].tags.colors)
                                .get(t)
                                .cloned()
                                .or_else(|| context.settings.tags.colors.get(t).cloned())
                        }),
                );
            }
            if !tags.is_empty() {
                tags.pop();
            }
        }
        let mut subject = e.subject().to_string();
        subject.truncate_at_boundary(150);
        EntryStrings {
            date: DateString(PlainListing::format_date(e)),
            subject: SubjectString(subject),
            flag: FlagString(format!(
                "{selected}{unseen}{attachments}{whitespace}",
                selected = if self.rows.selection.get(&e.hash()).cloned().unwrap_or(false) {
                    mailbox_settings!(
                        context[self.cursor_pos.0][&self.cursor_pos.1]
                            .listing
                            .selected_flag
                    )
                    .as_ref()
                    .map(|s| s.as_str())
                    .unwrap_or(super::DEFAULT_SELECTED_FLAG)
                } else {
                    ""
                },
                unseen = if !e.is_seen() {
                    mailbox_settings!(
                        context[self.cursor_pos.0][&self.cursor_pos.1]
                            .listing
                            .unseen_flag
                    )
                    .as_ref()
                    .map(|s| s.as_str())
                    .unwrap_or(super::DEFAULT_UNSEEN_FLAG)
                } else {
                    ""
                },
                attachments = if e.has_attachments() {
                    mailbox_settings!(
                        context[self.cursor_pos.0][&self.cursor_pos.1]
                            .listing
                            .attachment_flag
                    )
                    .as_ref()
                    .map(|s| s.as_str())
                    .unwrap_or(super::DEFAULT_ATTACHMENT_FLAG)
                } else {
                    ""
                },
                whitespace = if self.rows.selection.get(&e.hash()).cloned().unwrap_or(false)
                    || !e.is_seen()
                    || e.has_attachments()
                {
                    " "
                } else {
                    ""
                },
            )),
            from: FromString(address_list!((e.from()) as comma_sep_list)),
            tags: TagString(tags, colors),
        }
    }

    fn redraw_list(&mut self, context: &Context, iter: Box<dyn Iterator<Item = EnvelopeHash>>) {
        let account = &context.accounts[&self.cursor_pos.0];
        let mailbox = &account[&self.cursor_pos.1];
        let threads = account.collection.get_threads(self.cursor_pos.1);

        self.rows.clear();
        self.length = 0;
        let mut min_width = (0, 0, 0, 0, 0);

        for i in iter {
            if !context.accounts[&self.cursor_pos.0].contains_key(i) {
                debug!("key = {}", i);
                debug!(
                    "name = {} {}",
                    mailbox.name(),
                    context.accounts[&self.cursor_pos.0].name()
                );
                debug!("{:#?}", context.accounts);

                panic!();
            }
            let envelope: EnvelopeRef = context.accounts[&self.cursor_pos.0].collection.get_env(i);
            use melib::search::QueryTrait;
            if let Some(filter_query) = mailbox_settings!(
                context[self.cursor_pos.0][&self.cursor_pos.1]
                    .listing
                    .filter
            )
            .as_ref()
            {
                if !envelope.is_match(filter_query) {
                    continue;
                }
            }
            let row_attr = row_attr!(
                self.color_cache,
                self.length % 2 == 0,
                !envelope.is_seen(),
                false,
                false
            );
            self.rows.row_attr_cache.insert(self.length, row_attr);

            let entry_strings = self.make_entry_string(&envelope, context);
            min_width.1 = cmp::max(min_width.1, entry_strings.date.grapheme_width()); /* date */
            min_width.2 = cmp::max(min_width.2, entry_strings.from.grapheme_width()); /* from */
            min_width.3 = cmp::max(
                min_width.3,
                entry_strings.flag.grapheme_width()
                    + entry_strings.subject.grapheme_width()
                    + 1
                    + entry_strings.tags.grapheme_width(),
            ); /* tags + subject */
            self.rows.insert_thread(
                threads.envelope_to_thread[&i],
                (threads.envelope_to_thread[&i], i),
                smallvec::smallvec![i],
                entry_strings,
            );

            self.length += 1;
        }

        min_width.0 = self.length.saturating_sub(1).to_string().len();

        self.data_columns.elasticities[0].set_rigid();
        self.data_columns.elasticities[1].set_rigid();
        self.data_columns.elasticities[2].set_grow(5, Some(35));
        self.data_columns.elasticities[3].set_rigid();
        self.data_columns
            .cursor_config
            .set_handle(true)
            .set_even_odd_theme(
                self.color_cache.even_highlighted,
                self.color_cache.odd_highlighted,
            );
        self.data_columns
            .theme_config
            .set_even_odd_theme(self.color_cache.even, self.color_cache.odd);

        /* index column */
        self.data_columns.columns[0] =
            CellBuffer::new_with_context(min_width.0, self.rows.len(), None, context);
        /* date column */
        self.data_columns.columns[1] =
            CellBuffer::new_with_context(min_width.1, self.rows.len(), None, context);
        /* from column */
        self.data_columns.columns[2] =
            CellBuffer::new_with_context(min_width.2, self.rows.len(), None, context);
        /* subject column */
        self.data_columns.columns[3] =
            CellBuffer::new_with_context(min_width.3, self.rows.len(), None, context);

        let iter = if self.filter_term.is_empty() {
            Box::new(self.local_collection.iter().cloned())
                as Box<dyn Iterator<Item = EnvelopeHash>>
        } else {
            Box::new(self.filtered_selection.iter().cloned())
                as Box<dyn Iterator<Item = EnvelopeHash>>
        };

        let columns = &mut self.data_columns.columns;
        for ((idx, i), (_, strings)) in iter.enumerate().zip(self.rows.entries.iter()) {
            if !context.accounts[&self.cursor_pos.0].contains_key(i) {
                //debug!("key = {}", i);
                //debug!(
                //    "name = {} {}",
                //    mailbox.name(),
                //    context.accounts[&self.cursor_pos.0].name()
                //);
                //debug!("{:#?}", context.accounts);

                panic!();
            }

            let row_attr = self.rows.row_attr_cache[&idx];

            let (x, _) = write_string_to_grid(
                &idx.to_string(),
                &mut columns[0],
                row_attr.fg,
                row_attr.bg,
                row_attr.attrs,
                ((0, idx), (min_width.0, idx)),
                None,
            );
            for c in columns[0].row_iter(x..min_width.0, idx) {
                columns[0][c].set_bg(row_attr.bg).set_attrs(row_attr.attrs);
            }
            let (x, _) = write_string_to_grid(
                &strings.date,
                &mut columns[1],
                row_attr.fg,
                row_attr.bg,
                row_attr.attrs,
                ((0, idx), (min_width.1, idx)),
                None,
            );
            for c in columns[1].row_iter(x..min_width.1, idx) {
                columns[1][c].set_bg(row_attr.bg).set_attrs(row_attr.attrs);
            }
            let (x, _) = write_string_to_grid(
                &strings.from,
                &mut columns[2],
                row_attr.fg,
                row_attr.bg,
                row_attr.attrs,
                ((0, idx), (min_width.2, idx)),
                None,
            );
            for c in columns[2].row_iter(x..min_width.2, idx) {
                columns[2][c].set_bg(row_attr.bg).set_attrs(row_attr.attrs);
            }
            let (x, _) = write_string_to_grid(
                &strings.flag,
                &mut columns[3],
                row_attr.fg,
                row_attr.bg,
                row_attr.attrs,
                ((0, idx), (min_width.3, idx)),
                None,
            );
            let (x, _) = write_string_to_grid(
                &strings.subject,
                &mut columns[3],
                row_attr.fg,
                row_attr.bg,
                row_attr.attrs,
                ((x, idx), (min_width.3, idx)),
                None,
            );
            let x = {
                let mut x = x + 1;
                for (t, &color) in strings.tags.split_whitespace().zip(strings.tags.1.iter()) {
                    let color = color.unwrap_or(self.color_cache.tag_default.bg);
                    let (_x, _) = write_string_to_grid(
                        t,
                        &mut columns[3],
                        self.color_cache.tag_default.fg,
                        color,
                        self.color_cache.tag_default.attrs,
                        ((x + 1, idx), (min_width.3, idx)),
                        None,
                    );
                    for c in columns[3].row_iter(x..(x + 1), idx) {
                        columns[3][c].set_bg(color);
                    }
                    for c in columns[3].row_iter(_x..(_x + 1), idx) {
                        columns[3][c].set_bg(color).set_keep_bg(true);
                    }
                    for c in columns[3].row_iter((x + 1)..(_x + 1), idx) {
                        columns[3][c].set_keep_fg(true).set_keep_bg(true);
                    }
                    for c in columns[3].row_iter(x..(x + 1), idx) {
                        columns[3][c].set_keep_bg(true);
                    }
                    x = _x + 1;
                }
                x
            };
            for c in columns[3].row_iter(x..min_width.3, idx) {
                columns[3][c].set_bg(row_attr.bg).set_attrs(row_attr.attrs);
            }
        }
        if self.length == 0 && self.filter_term.is_empty() {
            let message: String = account[&self.cursor_pos.1].status();
            self.data_columns.columns[0] =
                CellBuffer::new_with_context(message.len(), self.length + 1, None, context);
            write_string_to_grid(
                &message,
                &mut self.data_columns.columns[0],
                self.color_cache.theme_default.fg,
                self.color_cache.theme_default.bg,
                self.color_cache.theme_default.attrs,
                ((0, 0), (message.len() - 1, 0)),
                None,
            );
        }
    }

    fn get_env_under_cursor(&self, cursor: usize) -> Option<EnvelopeHash> {
        if self.filter_term.is_empty() {
            self.local_collection.get(cursor).cloned()
        } else {
            self.filtered_selection.get(cursor).cloned()
        }
    }

    fn format_date(envelope: &Envelope) -> String {
        let d = std::time::UNIX_EPOCH + std::time::Duration::from_secs(envelope.date());
        let now: std::time::Duration = std::time::SystemTime::now()
            .duration_since(d)
            .unwrap_or_else(|_| std::time::Duration::new(std::u64::MAX, 0));
        match now.as_secs() {
            n if n < 10 * 60 * 60 => format!("{} hours ago{}", n / (60 * 60), " ".repeat(8)),
            n if n < 24 * 60 * 60 => format!("{} hours ago{}", n / (60 * 60), " ".repeat(7)),
            n if n < 4 * 24 * 60 * 60 => {
                format!("{} days ago{}", n / (24 * 60 * 60), " ".repeat(9))
            }
            _ => melib::datetime::timestamp_to_string(envelope.datetime(), None, false),
        }
    }
}

impl Component for PlainListing {
    fn draw(&mut self, grid: &mut CellBuffer, area: Area, context: &mut Context) {
        if !self.is_dirty() {
            return;
        }

        if matches!(self.focus, Focus::EntryFullscreen) {
            return self.view.draw(grid, area, context);
        }

        if matches!(self.focus, Focus::None) {
            let mut area = area;
            if !self.filter_term.is_empty() {
                let (upper_left, bottom_right) = area;
                let (x, y) = write_string_to_grid(
                    &format!(
                        "{} results for `{}` (Press ESC to exit)",
                        self.filtered_selection.len(),
                        self.filter_term
                    ),
                    grid,
                    self.color_cache.theme_default.fg,
                    self.color_cache.theme_default.bg,
                    self.color_cache.theme_default.attrs,
                    area,
                    Some(get_x(upper_left)),
                );
                clear_area(
                    grid,
                    ((x, y), set_y(bottom_right, y)),
                    self.color_cache.theme_default,
                );
                context
                    .dirty_areas
                    .push_back((upper_left, set_y(bottom_right, y + 1)));

                area = (set_y(upper_left, y + 1), bottom_right);
            }

            if !self.rows.row_updates.is_empty() {
                let (upper_left, bottom_right) = area;
                while let Some(env_hash) = self.rows.row_updates.pop() {
                    let row: usize = self.rows.env_order[&env_hash];
                    let rows = get_y(bottom_right) - get_y(upper_left) + 1;
                    let page_no = (self.new_cursor_pos.2).wrapping_div(rows);

                    let top_idx = page_no * rows;
                    if row >= top_idx && row <= top_idx + rows {
                        let new_area = nth_row_area(area, row % rows);
                        self.data_columns.draw(
                            grid,
                            row,
                            self.cursor_pos.2,
                            grid.bounds_iter(new_area),
                        );
                        let envelope: EnvelopeRef = context.accounts[&self.cursor_pos.0]
                            .collection
                            .get_env(env_hash);
                        let row_attr = row_attr!(
                            self.color_cache,
                            row % 2 == 0,
                            !envelope.is_seen(),
                            false,
                            self.rows.selection[&env_hash]
                        );
                        self.rows.row_attr_cache.insert(row, row_attr);

                        change_colors(grid, new_area, row_attr.fg, row_attr.bg);
                        context.dirty_areas.push_back(new_area);
                    }
                }
                if self.force_draw {
                    /* Draw the entire list */
                    self.draw_list(grid, area, context);
                    self.force_draw = false;
                }
            } else {
                /* Draw the entire list */
                self.draw_list(grid, area, context);
            }
        } else {
            if self.length == 0 && self.dirty {
                clear_area(grid, area, self.color_cache.theme_default);
                context.dirty_areas.push_back(area);
                return;
            }

            self.view.draw(grid, area, context);
        }
        self.dirty = false;
    }

    fn process_event(&mut self, event: &mut UIEvent, context: &mut Context) -> bool {
        let shortcuts = self.get_shortcuts(context);

        match (&event, self.focus) {
            (UIEvent::Input(ref k), Focus::Entry)
                if shortcut!(k == shortcuts[Shortcuts::LISTING]["focus_right"]) =>
            {
                self.set_focus(Focus::EntryFullscreen, context);
                return true;
            }
            (UIEvent::Input(ref k), Focus::EntryFullscreen)
                if shortcut!(k == shortcuts[Shortcuts::LISTING]["focus_left"]) =>
            {
                self.set_focus(Focus::Entry, context);
                return true;
            }
            (UIEvent::Input(ref k), Focus::Entry)
                if shortcut!(k == shortcuts[Shortcuts::LISTING]["focus_left"]) =>
            {
                self.set_focus(Focus::None, context);
                return true;
            }
            _ => {}
        }

        if self.unfocused() && self.view.process_event(event, context) {
            return true;
        }

        if self.length > 0 {
            match *event {
                UIEvent::Input(ref k)
                    if matches!(self.focus, Focus::None)
                        && (shortcut!(k == shortcuts[Shortcuts::LISTING]["open_entry"])
                            || shortcut!(k == shortcuts[Shortcuts::LISTING]["focus_right"])) =>
                {
                    self.set_focus(Focus::Entry, context);
                    return true;
                }
                UIEvent::Input(ref k)
                    if !matches!(self.focus, Focus::None)
                        && shortcut!(k == shortcuts[Shortcuts::LISTING]["exit_entry"]) =>
                {
                    self.set_focus(Focus::None, context);
                    return true;
                }
                UIEvent::Input(ref k)
                    if !matches!(self.focus, Focus::None)
                        && shortcut!(k == shortcuts[Shortcuts::LISTING]["focus_left"]) =>
                {
                    match self.focus {
                        Focus::Entry => {
                            self.set_focus(Focus::None, context);
                        }
                        Focus::EntryFullscreen => {
                            self.set_focus(Focus::Entry, context);
                        }
                        Focus::None => {
                            unreachable!();
                        }
                    }
                    return true;
                }
                UIEvent::Input(ref key)
                    if !self.unfocused()
                        && shortcut!(key == shortcuts[Shortcuts::LISTING]["select_entry"]) =>
                {
                    if self.modifier_active && self.modifier_command.is_none() {
                        self.modifier_command = Some(Modifier::default());
                    } else if let Some(env_hash) = self.get_env_under_cursor(self.cursor_pos.2) {
                        self.rows.update_selection_with_env(env_hash, |e| *e = !*e);
                    }
                    return true;
                }
                UIEvent::Action(ref action) => match action {
                    Action::SubSort(field, order) if !self.unfocused() => {
                        debug!("SubSort {:?} , {:?}", field, order);
                        self.subsort = (*field, *order);
                        //if !self.filtered_selection.is_empty() {
                        //    let threads = &account.collection.threads[&self.cursor_pos.1];
                        //    threads.vec_inner_sort_by(&mut self.filtered_selection, self.sort, &account.collection);
                        //} else {
                        //    self.refresh_mailbox(contex, falset);
                        //}
                        return true;
                    }
                    Action::Sort(field, order) if !self.unfocused() => {
                        debug!("Sort {:?} , {:?}", field, order);
                        self.sort = (*field, *order);
                        return true;
                    }

                    _ => {}
                },
                _ => {}
            }
        }
        match *event {
            UIEvent::ConfigReload { old_settings: _ } => {
                self.color_cache = ColorCache {
                    even: crate::conf::value(context, "mail.listing.plain.even"),
                    odd: crate::conf::value(context, "mail.listing.plain.odd"),
                    even_unseen: crate::conf::value(context, "mail.listing.plain.even_unseen"),
                    odd_unseen: crate::conf::value(context, "mail.listing.plain.odd_unseen"),
                    even_highlighted: crate::conf::value(
                        context,
                        "mail.listing.plain.even_highlighted",
                    ),
                    odd_highlighted: crate::conf::value(
                        context,
                        "mail.listing.plain.odd_highlighted",
                    ),
                    even_selected: crate::conf::value(context, "mail.listing.plain.even_selected"),
                    odd_selected: crate::conf::value(context, "mail.listing.plain.odd_selected"),
                    tag_default: crate::conf::value(context, "mail.listing.tag_default"),
                    theme_default: crate::conf::value(context, "theme_default"),
                    ..self.color_cache
                };
                if !context.settings.terminal.use_color() {
                    self.color_cache.highlighted.attrs |= Attr::REVERSE;
                    self.color_cache.tag_default.attrs |= Attr::REVERSE;
                    self.color_cache.even_highlighted.attrs |= Attr::REVERSE;
                    self.color_cache.odd_highlighted.attrs |= Attr::REVERSE;
                }

                self.refresh_mailbox(context, true);
                self.set_dirty(true);
            }
            UIEvent::MailboxUpdate((ref idxa, ref idxf))
                if (*idxa, *idxf) == (self.new_cursor_pos.0, self.cursor_pos.1) =>
            {
                self.refresh_mailbox(context, false);
                self.set_dirty(true);
            }
            UIEvent::StartupCheck(ref f) if *f == self.cursor_pos.1 => {
                self.refresh_mailbox(context, false);
                self.set_dirty(true);
            }
            UIEvent::EnvelopeRename(ref old_hash, ref new_hash) => {
                let account = &context.accounts[&self.cursor_pos.0];
                if !account.collection.contains_key(new_hash)
                    || !account
                        .collection
                        .get_mailbox(self.cursor_pos.1)
                        .contains(new_hash)
                {
                    return false;
                }

                self.rows.rename_env(*old_hash, *new_hash);
                for h in self.filtered_selection.iter_mut() {
                    if *h == *old_hash {
                        *h = *new_hash;
                        break;
                    }
                }

                self.dirty = true;

                if self.unfocused() {
                    self.view
                        .process_event(&mut UIEvent::EnvelopeRename(*old_hash, *new_hash), context);
                }
            }
            UIEvent::EnvelopeUpdate(ref env_hash) => {
                let account = &context.accounts[&self.cursor_pos.0];
                if !account.collection.contains_key(env_hash)
                    || !account
                        .collection
                        .get_mailbox(self.cursor_pos.1)
                        .contains(env_hash)
                {
                    return false;
                }

                self.rows.row_updates.push(*env_hash);
                self.dirty = true;

                if self.unfocused() {
                    self.view
                        .process_event(&mut UIEvent::EnvelopeUpdate(*env_hash), context);
                }
            }
            UIEvent::ChangeMode(UIMode::Normal) => {
                self.dirty = true;
            }
            UIEvent::Resize => {
                self.dirty = true;
            }
            UIEvent::Input(Key::Esc)
                if !self.unfocused()
                    && self
                        .rows
                        .selection
                        .values()
                        .cloned()
                        .any(std::convert::identity) =>
            {
                self.rows.clear_selection();
                self.dirty = true;
                return true;
            }
            UIEvent::Input(Key::Esc) if !self.unfocused() && !self.filter_term.is_empty() => {
                self.set_coordinates((self.new_cursor_pos.0, self.new_cursor_pos.1));
                self.set_dirty(true);
                self.refresh_mailbox(context, false);
                return true;
            }
            UIEvent::Action(Action::Listing(Search(ref filter_term))) if !self.unfocused() => {
                match context.accounts[&self.cursor_pos.0].search(
                    filter_term,
                    self.sort,
                    self.cursor_pos.1,
                ) {
                    Ok(job) => {
                        let handle = context.accounts[&self.cursor_pos.0]
                            .job_executor
                            .spawn_specialized(job);
                        self.search_job = Some((filter_term.to_string(), handle));
                    }
                    Err(err) => {
                        context.replies.push_back(UIEvent::Notification(
                            Some("Could not perform search".to_string()),
                            err.to_string(),
                            Some(crate::types::NotificationType::Error(err.kind)),
                        ));
                    }
                };
                self.set_dirty(true);
            }
            UIEvent::StatusEvent(StatusEvent::JobFinished(ref job_id))
                if self
                    .search_job
                    .as_ref()
                    .map(|(_, j)| j == job_id)
                    .unwrap_or(false) =>
            {
                let (filter_term, mut handle) = self.search_job.take().unwrap();
                match handle.chan.try_recv() {
                    Err(_) => { /* search was canceled */ }
                    Ok(None) => { /* something happened, perhaps a worker thread panicked */ }
                    Ok(Some(Ok(results))) => self.filter(filter_term, results, context),
                    Ok(Some(Err(err))) => {
                        context.replies.push_back(UIEvent::Notification(
                            Some("Could not perform search".to_string()),
                            err.to_string(),
                            Some(crate::types::NotificationType::Error(err.kind)),
                        ));
                    }
                }
                self.set_dirty(true);
            }
            _ => {}
        }
        false
    }

    fn is_dirty(&self) -> bool {
        match self.focus {
            Focus::None => self.dirty,
            Focus::Entry | Focus::EntryFullscreen => self.view.is_dirty(),
        }
    }

    fn set_dirty(&mut self, value: bool) {
        self.dirty = value;
        if self.unfocused() {
            self.view.set_dirty(value);
        }
    }

    fn get_shortcuts(&self, context: &Context) -> ShortcutMaps {
        let mut map = if self.unfocused() {
            self.view.get_shortcuts(context)
        } else {
            ShortcutMaps::default()
        };

        map.insert(
            Shortcuts::LISTING,
            context.settings.shortcuts.listing.key_values(),
        );

        map
    }

    fn id(&self) -> ComponentId {
        self.id
    }
    fn set_id(&mut self, id: ComponentId) {
        self.id = id;
    }
}