local InputContainer = require("ui/widget/container/inputcontainer")
local LoginDialog = require("ui/widget/logindialog")
local InfoMessage = require("ui/widget/infomessage")
local UIManager = require("ui/uimanager")
local Screen = require("ui/screen")
local Event = require("ui/event")
local DEBUG = require("dbg")
local _ = require("gettext")

local slt2 = require('slt2')
local MyClipping = require("clip")
local EvernoteOAuth = require("EvernoteOAuth")
local EvernoteClient = require("EvernoteClient")

local EvernoteExporter = InputContainer:new{
    login_title = _("Login to Evernote"),
    notebook_name = _("Koreader Notes"),
    --evernote_domain = "sandbox",

    evernote_token,
    notebook_guid,
}

function EvernoteExporter:init()
    self.ui.menu:registerToMainMenu(self)

    local settings = G_reader_settings:readSetting("evernote") or {}
    self.evernote_username = settings.username or ""
    self.evernote_token = settings.token
    self.notebook_guid = settings.notebook

    self.parser = MyClipping:new{
        my_clippings = "/mnt/us/documents/My Clippings.txt",
        history_dir = "./history",
    }
    self.template = slt2.loadfile(self.path.."/note.tpl")
end

function EvernoteExporter:addToMainMenu(tab_item_table)
    table.insert(tab_item_table.plugins, {
        text = _("Evernote"),
        sub_item_table = {
            {
                text_func = function()
                    return self.evernote_token and _("Logout") or _("Login")
                end,
                callback = function()
                    if self.evernote_token then
                        self:logout()
                    else
                        self:login()
                    end
                end
            },
            {
                text = _("Export all notes in this book"),
                callback = function()
                    UIManager:scheduleIn(0.5, function()
                        self:exportCurrentNotes(self.view)
                    end)

                    UIManager:show(InfoMessage:new{
                        text = _("This may take several seconds..."),
                        timeout = 3,
                    })
                end
            },
            {
                text = _("Export all notes in your library"),
                callback = function()
                    UIManager:scheduleIn(0.5, function()
                        self:exportAllNotes()
                    end)

                    UIManager:show(InfoMessage:new{
                        text = _("This may take several minutes..."),
                        timeout = 3,
                    })
                end
            },
        }
    })
end

function EvernoteExporter:login()
    self.login_dialog = LoginDialog:new{
        title = self.login_title,
        username = self.evernote_username or "",
        buttons = {
            {
                {
                    text = _("Cancel"),
                    enabled = true,
                    callback = function()
                        self:closeDialog()
                    end,
                },
                {
                    text = _("Login"),
                    enabled = true,
                    callback = function()
                        local username, password = self:getCredential()
                        self:closeDialog()
                        UIManager:scheduleIn(0.5, function()
                            self:doLogin(username, password)
                        end)
                    end,
                },
            },
        },
        width = Screen:getWidth() * 0.8,
        height = Screen:getHeight() * 0.4,
    }

    self.login_dialog:onShowKeyboard()
    UIManager:show(self.login_dialog)
end

function EvernoteExporter:closeDialog()
    self.login_dialog:onClose()
    UIManager:close(self.login_dialog)
end

function EvernoteExporter:getCredential()
    return self.login_dialog:getCredential()
end

function EvernoteExporter:doLogin(username, password)
    self:closeDialog()

    local oauth = EvernoteOAuth:new{
        domain = self.evernote_domain,
        username = username,
        password = password,
    }
    self.evernote_username = username
    local ok, token = pcall(oauth.getToken, oauth)
    if not ok or not token then
        UIManager:show(InfoMessage:new{
            text = _("Error occurs when login:") .. "\n" .. token,
        })
        return
    end

    local client = EvernoteClient:new{
        domain = self.evernote_domain,
        authToken = token,
    }
    local ok, guid = pcall(self.getExportNotebook, self, client)
    if not ok or not guid then
        UIManager:show(InfoMessage:new{
            text = _("Error occurs when login:") .. "\n" .. guid,
        })
    elseif guid then
        self.evernote_token = token
        self.notebook_guid = guid
        UIManager:show(InfoMessage:new{
            text = _("Login to Evernote successfully"),
        })
    end

    self:saveSettings()
end

function EvernoteExporter:logout()
    self.evernote_token = nil
    self.notebook_guid = nil
    self:saveSettings()
end

function EvernoteExporter:saveSettings()
    local settings = {
        username = self.evernote_username,
        token = self.evernote_token,
        notebook = self.notebook_guid,
    }
    G_reader_settings:saveSetting("evernote", settings)
end

function EvernoteExporter:getExportNotebook(client)
    local name = self.notebook_name
    return client:findNotebookByTitle(name) or client:createNotebook(name).guid
end

function EvernoteExporter:exportCurrentNotes(view)
    local client = EvernoteClient:new{
        domain = self.evernote_domain,
        authToken = self.evernote_token,
    }

    local clippings = self.parser:parseCurrentDoc(view)
    self:exportClippings(client, clippings)
end

function EvernoteExporter:exportAllNotes()
    local client = EvernoteClient:new{
        domain = self.evernote_domain,
        authToken = self.evernote_token,
    }

    local clippings = self.parser:parseMyClippings()
    if next(clippings) == nil then
        clippings = self.parser:parseHistory()
    end
    -- remove blank entries
    for title, booknotes in pairs(clippings) do
        -- chapter number is zero
        if #booknotes == 0 then
            clippings[title] = nil
        end
    end
    --DEBUG("clippings", clippings)
    self:exportClippings(client, clippings)
end

function EvernoteExporter:exportClippings(client, clippings)
    local export_count, error_count = 0, 0
    local export_title, error_title
    for title, booknotes in pairs(clippings) do
        local ok, err = pcall(self.exportBooknotes, self, client, title, booknotes)

        -- error reporting
        if not ok then
            DEBUG("Error occurs when exporting book:", title, err)
            error_count = error_count + 1
            error_title = title
        else
            DEBUG("Exported notes in book:", title)
            export_count = export_count + 1
            export_title = title
        end
    end

    local msg = ""
    local all_count = export_count + error_count
    if export_count > 0 and error_count == 0 then
        if all_count == 1 then
            msg = _("Exported notes in book:") .. "\n" .. export_title
        else
            msg = _("Exported notes in book:") .. "\n" .. export_title
            msg = msg .. "\n" .. _("and ") .. all_count-1 .. _("others.")
        end
    elseif error_count > 0 then
        if all_count == 1 then
            msg = _("Error occurs when exporting book:") .. "\n" .. error_title
        else
            msg = _("Errors occur when exporting book:") .. "\n" .. error_title
            msg = msg .. "\n" .. _("and ") .. error_count-1 .. ("others.")
        end
    end
    UIManager:show(InfoMessage:new{ text = msg })

end

function EvernoteExporter:exportBooknotes(client, title, booknotes)
    local content = slt2.render(self.template, {
        booknotes = booknotes,
        notemarks = _("Note: "),
    })
    --DEBUG("content", content)
    local note_guid = client:findNoteByTitle(title, self.notebook_guid)
    if not note_guid then
        client:createNote(title, content, {}, self.notebook_guid)
    else
        client:updateNote(note_guid, title, content, {}, self.notebook_guid)
    end
end

return EvernoteExporter