/**
 * Copyright (c) 2007-2012, Timothy Stack
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * * Neither the name of Timothy Stack nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @file view_curses.cc
 */

#include "config.h"

#include <string>
#include <algorithm>

#include "lnav_log.hh"
#include "view_curses.hh"

using namespace std;

string_attr_type view_curses::VC_STYLE;
string_attr_type view_curses::VC_GRAPHIC;

const struct itimerval ui_periodic_timer::INTERVAL = {
    { 0, 350 * 1000 },
    { 0, 350 * 1000 }
};

ui_periodic_timer::ui_periodic_timer()
{
    struct sigaction sa;

    sa.sa_handler = ui_periodic_timer::sigalrm;
    sa.sa_flags = SA_RESTART;
    sigemptyset(&sa.sa_mask);
    sigaction(SIGALRM, &sa, NULL);
    if (setitimer(ITIMER_REAL, &INTERVAL, NULL) == -1) {
        perror("setitimer");
    }
}

ui_periodic_timer &ui_periodic_timer::singleton()
{
    static ui_periodic_timer retval;

    return retval;
}

void ui_periodic_timer::sigalrm(int sig)
{
    singleton().upt_counter += 1;
}

alerter &alerter::singleton() {
    static alerter retval;

    return retval;
}

void view_curses::mvwattrline(WINDOW *window,
                              int y,
                              int x,
                              attr_line_t &al,
                              const struct line_range &lr,
                              view_colors::role_t base_role)
{
    int text_attrs, attrs, line_width;
    string_attrs_t &         sa   = al.get_attrs();
    string &                 line = al.get_string();
    string_attrs_t::iterator iter;
    std::map<size_t, size_t, std::greater<size_t> > tab_list;
    int    tab_count = 0;
    char  *expanded_line;
    size_t exp_index = 0;
    string full_line;

    require(lr.lr_end >= 0);

    line_width    = lr.length();
    tab_count     = count(line.begin(), line.end(), '\t');
    expanded_line = (char *)alloca(line.size() + tab_count * 8 + 1);

    for (size_t lpc = 0; lpc < line.size(); lpc++) {
        switch (line[lpc]) {
        case '\t':
            do {
                expanded_line[exp_index] = ' ';
                exp_index += 1;
            } while (exp_index % 8);
            tab_list[lpc] = exp_index;
            break;

        case '\r':
            /* exp_index = -1; */
            break;

        case '\n':
            expanded_line[exp_index] = ' ';
            exp_index += 1;
            break;

        default:
            expanded_line[exp_index] = line[lpc];
            exp_index += 1;
            break;
        }
    }

    expanded_line[exp_index] = '\0';
    full_line = string(expanded_line);

    text_attrs = view_colors::singleton().attrs_for_role(base_role);
    attrs      = text_attrs;
    wmove(window, y, x);
    wattron(window, attrs);
    if (lr.lr_start < (int)full_line.size()) {
        waddnstr(window, &full_line.c_str()[lr.lr_start], line_width);
    }
    if (lr.lr_end > (int)full_line.size()) {
        whline(window, ' ', lr.lr_end - full_line.size());
    }
    wattroff(window, attrs);

    std::vector<line_range> graphic_range;
    std::vector<int>        graphic_in;

    stable_sort(sa.begin(), sa.end());
    for (iter = sa.begin(); iter != sa.end(); ++iter) {
        struct line_range attr_range = iter->sa_range;
        std::map<size_t, size_t>::iterator tab_iter;

        require(attr_range.lr_start >= 0);
        require(attr_range.lr_end >= -1);

        tab_iter = tab_list.lower_bound(attr_range.lr_start);
        if (tab_iter != tab_list.end()) {
            if (attr_range.lr_start > tab_iter->first) {
                attr_range.lr_start += (tab_iter->second - tab_iter->first) - 1;
            }
        }

        if (attr_range.lr_end != -1) {
            tab_iter = tab_list.lower_bound(attr_range.lr_end);
            if (tab_iter != tab_list.end()) {
                if (attr_range.lr_end >= tab_iter->first) {
                    attr_range.lr_end += (
                        tab_iter->second - tab_iter->first) - 1;
                }
            }
        }

        attr_range.lr_start = max(0, attr_range.lr_start - lr.lr_start);
        if (attr_range.lr_end == -1) {
            attr_range.lr_end = lr.lr_start + line_width;
        }

        attr_range.lr_end = min((int)line_width,
            attr_range.lr_end - lr.lr_start);

        if (attr_range.lr_end > attr_range.lr_start) {
            string_attrs_t::iterator range_iter;
            int awidth = attr_range.length();
            int color_pair = -1;

            attrs = 0;
            for (range_iter = iter;
                 range_iter != sa.end() && range_iter->sa_range == iter->sa_range;
                 ++range_iter) {
                if (range_iter->sa_type == &VC_STYLE) {
                    if (color_pair <= 0) {
                        color_pair = PAIR_NUMBER(range_iter->sa_value.sav_int);
                    }
                    attrs |= range_iter->sa_value.sav_int;
                }
            }

            if (attrs != 0) {
                int x_pos = x + attr_range.lr_start;
                int ch_width = min(awidth, (line_width - attr_range.lr_start));
                chtype row_ch[ch_width + 1];

                mvwinchnstr(window, y, x_pos, row_ch, ch_width);
                for (int lpc = 0; lpc < ch_width; lpc++) {
                    if (color_pair > 0) {
                        row_ch[lpc] &= ~A_COLOR;
                        row_ch[lpc] |= (attrs & ~A_COLOR) | COLOR_PAIR(color_pair);
                    } else {
                        row_ch[lpc] |= (attrs);
                    }
                }
                mvwaddchnstr(window, y, x_pos, row_ch, ch_width);
            }
            for (range_iter = iter;
                 range_iter != sa.end() && range_iter->sa_range == iter->sa_range;
                 ++range_iter) {
                if (range_iter->sa_type == &VC_GRAPHIC) {
                    graphic_range.push_back(attr_range);
                    graphic_in.push_back(range_iter->sa_value.sav_int | attrs);
                }
            }
        }
    }

    for (size_t lpc = 0; lpc < graphic_range.size(); lpc++) {
        for (int lpc2 = graphic_range[lpc].lr_start;
             lpc2 < graphic_range[lpc].lr_end;
             lpc2++) {
            mvwaddch(window, y, lpc2, graphic_in[lpc]);
        }
    }
}

view_colors &view_colors::singleton(void)
{
    static view_colors s_vc;

    return s_vc;
}

view_colors::view_colors()
    : vc_next_highlight(0), vc_next_plain_highlight(0)
{
}

void view_colors::init(void)
{
    if (has_colors()) {
        static int ansi_colors_to_curses[] = {
            COLOR_BLACK,
            COLOR_RED,
            COLOR_GREEN,
            COLOR_YELLOW,
            COLOR_BLUE,
            COLOR_MAGENTA,
            COLOR_CYAN,
            COLOR_WHITE,
        };

        start_color();

        /* use_default_colors(); */
        for (int fg = 0; fg < 8; fg++) {
            for (int bg = 0; bg < 8; bg++) {
                if (fg == 0 && bg == 0)
                    continue;
                init_pair(ansi_color_pair_index(fg, bg),
                          ansi_colors_to_curses[fg],
                          ansi_colors_to_curses[bg]);
            }
        }

        if (COLORS == 256) {
            int color_pair_base = VC_ANSI_END;

            for (int z = 0; z < 6; z++) {
                for (int x = 1; x < 6; x += 2) {
                    for (int y = 1; y < 6; y += 2) {
                        int fg = 16 + x + (y * 6) + (z * 6 * 6);

                        init_pair(color_pair_base,
                                  fg,
                                  COLOR_BLACK);
                        init_pair(color_pair_base + HL_COLOR_COUNT,
                                  COLOR_BLACK,
                                  fg);
                        color_pair_base += 1;
                    }
                }
            }
        }
    }

    singleton().init_roles();
}

void view_colors::init_roles(void)
{
    int lpc;

    /* Setup the mappings from roles to actual colors. */
    this->vc_role_colors[VCR_TEXT]   =
        ansi_color_pair(COLOR_WHITE, COLOR_BLACK) | A_DIM;
    this->vc_role_colors[VCR_SEARCH] =
        this->vc_role_colors[VCR_TEXT] | A_REVERSE;
    this->vc_role_colors[VCR_OK]      = ansi_color_pair(COLOR_GREEN, COLOR_BLACK) | A_BOLD;
    this->vc_role_colors[VCR_ERROR]   = ansi_color_pair(COLOR_RED, COLOR_BLACK) | A_BOLD;
    this->vc_role_colors[VCR_WARNING] = ansi_color_pair(COLOR_YELLOW, COLOR_BLACK) | A_BOLD;
    this->vc_role_colors[VCR_ALT_ROW] = ansi_color_pair(COLOR_WHITE, COLOR_BLACK) | A_BOLD;
    this->vc_role_colors[VCR_ADJUSTED_TIME] = ansi_color_pair(COLOR_MAGENTA, COLOR_BLACK);

    this->vc_role_colors[VCR_STATUS] =
        ansi_color_pair(COLOR_BLACK, COLOR_WHITE);
    this->vc_role_colors[VCR_WARN_STATUS] =
        ansi_color_pair(COLOR_YELLOW, COLOR_WHITE) | A_BOLD;
    this->vc_role_colors[VCR_ALERT_STATUS] =
        ansi_color_pair(COLOR_RED, COLOR_WHITE);
    this->vc_role_colors[VCR_ACTIVE_STATUS] =
        ansi_color_pair(COLOR_GREEN, COLOR_WHITE);
    this->vc_role_colors[VCR_ACTIVE_STATUS2] =
        ansi_color_pair(COLOR_GREEN, COLOR_WHITE) | A_BOLD;
    this->vc_role_colors[VCR_BOLD_STATUS] =
        ansi_color_pair(COLOR_BLACK, COLOR_WHITE) | A_BOLD;

    this->vc_role_colors[VCR_KEYWORD] = ansi_color_pair(COLOR_BLUE, COLOR_BLACK);
    this->vc_role_colors[VCR_STRING] = ansi_color_pair(COLOR_GREEN, COLOR_BLACK) | A_BOLD;
    this->vc_role_colors[VCR_COMMENT] = ansi_color_pair(COLOR_GREEN, COLOR_BLACK);
    this->vc_role_colors[VCR_VARIABLE] = ansi_color_pair(COLOR_CYAN, COLOR_BLACK);

    this->vc_role_colors[VCR_DIFF_DELETE]  = ansi_color_pair(COLOR_RED, COLOR_BLACK);
    this->vc_role_colors[VCR_DIFF_ADD]     = ansi_color_pair(COLOR_GREEN, COLOR_BLACK);
    this->vc_role_colors[VCR_DIFF_SECTION] = ansi_color_pair(COLOR_MAGENTA, COLOR_BLACK);

    for (lpc = 0; lpc < VCR_HIGHLIGHT_START; lpc++) {
        this->vc_role_reverse_colors[lpc] =
            this->vc_role_colors[lpc] | A_REVERSE;
    }

    static int basic_hl_pairs[HL_BASIC_COLOR_COUNT] = {
        ansi_color_pair(COLOR_BLUE, COLOR_BLACK),
        ansi_color_pair(COLOR_CYAN, COLOR_BLACK),
        ansi_color_pair(COLOR_GREEN, COLOR_BLACK),
        ansi_color_pair(COLOR_MAGENTA, COLOR_BLACK),
    };

    static int basic_rev_hl_pairs[HL_BASIC_COLOR_COUNT] = {
        ansi_color_pair(COLOR_BLUE, COLOR_WHITE),
        ansi_color_pair(COLOR_CYAN, COLOR_BLACK),
        ansi_color_pair(COLOR_GREEN, COLOR_WHITE),
        ansi_color_pair(COLOR_MAGENTA, COLOR_WHITE),
    };

    for (lpc = 0; lpc < HL_COLOR_COUNT / 2; lpc++) {
        this->vc_role_colors[VCR_HIGHLIGHT_START + (lpc * 2)] = basic_hl_pairs[
            lpc % HL_BASIC_COLOR_COUNT];
        this->vc_role_colors[VCR_HIGHLIGHT_START + (lpc * 2) + 1] = basic_hl_pairs[
            lpc % HL_BASIC_COLOR_COUNT] | A_BOLD;

        this->vc_role_reverse_colors[VCR_HIGHLIGHT_START + (lpc * 2)] = basic_rev_hl_pairs[
            lpc % HL_BASIC_COLOR_COUNT] | A_REVERSE;
        this->vc_role_reverse_colors[VCR_HIGHLIGHT_START + (lpc * 2) + 1] = basic_rev_hl_pairs[
            lpc % HL_BASIC_COLOR_COUNT] | A_BOLD | A_REVERSE;
    }

    if (COLORS >= 256) {
        int color_pair_base = VC_ANSI_END;

        /*
         * Prime the highlight vector.  The first HL_COLOR_COUNT color
         * pairs are assumed to be the highlight colors.
         */
        for (lpc = VCR_HIGHLIGHT_START + HL_BASIC_COLOR_COUNT * 2;
             lpc < VCR__MAX;
             lpc++) {

            this->vc_role_colors[lpc] = COLOR_PAIR(color_pair_base);

            this->vc_role_reverse_colors[lpc] =
                COLOR_PAIR(color_pair_base) | A_REVERSE;

            color_pair_base += 1;
        }
    }
}

view_colors::role_t view_colors::next_highlight()
{
    role_t retval = (role_t)(VCR_HIGHLIGHT_START + this->vc_next_highlight);

    this->vc_next_highlight = (this->vc_next_highlight + 1) % HL_COLOR_COUNT;

    return retval;
}

view_colors::role_t view_colors::next_plain_highlight()
{
    role_t retval = (role_t)(VCR_HIGHLIGHT_START + this->vc_next_plain_highlight);

    this->vc_next_plain_highlight = (this->vc_next_plain_highlight + 2) %
                                    (HL_COLOR_COUNT);

    return retval;
}