---------------------------------------------------------------------------
-- @author Julien Danjou <julien@danjou.info>
-- @copyright 2008-2009 Julien Danjou
-- @release @AWESOME_VERSION@
---------------------------------------------------------------------------

-- Grab environment we need
local capi = { screen = screen,
               image = image,
               client = client }
local ipairs = ipairs
local type = type
local setmetatable = setmetatable
local table = table
local common = require("awful.widget.common")
local beautiful = require("beautiful")
local client = require("awful.client")
local util = require("awful.util")
local tag = require("awful.tag")
local layout = require("awful.widget.layout")

--- Tasklist widget module for awful
module("awful.widget.tasklist")

-- Public structures
filter = {}

local function tasklist_label(c, args)
    if not args then args = {} end
    local theme = beautiful.get()
    local fg_focus = args.fg_focus or theme.tasklist_fg_focus or theme.fg_focus
    local bg_focus = args.bg_focus or theme.tasklist_bg_focus or theme.bg_focus
    local fg_urgent = args.fg_urgent or theme.tasklist_fg_urgent or theme.fg_urgent
    local bg_urgent = args.bg_urgent or theme.tasklist_bg_urgent or theme.bg_urgent
    local fg_minimize = args.fg_minimize or theme.tasklist_fg_minimize or theme.fg_minimize
    local bg_minimize = args.bg_minimize or theme.tasklist_bg_minimize or theme.bg_minimize
    local font = args.font or theme.tasklist_font or theme.font or ""
    local bg = nil
    local text = "<span font_desc='"..font.."'>"
    local name = ""
    if client.floating.get(c) then name = name .. "✈" end
    if c.maximized_horizontal then name = name .. '⬌' end
    if c.maximized_vertical then name = name .. "⬍" end
    if c.minimized then
        name = name .. (util.escape(c.icon_name) or util.escape(c.name) or util.escape("<untitled>"))
    else
        name = name .. (util.escape(c.name) or util.escape("<untitled>"))
    end
    if capi.client.focus == c then
        bg = bg_focus
        if fg_focus then
            text = text .. "<span color='"..util.color_strip_alpha(fg_focus).."'>"..name.."</span>"
        else
            text = text .. name
        end
    elseif c.urgent and fg_urgent then
        bg = bg_urgent
        text = text .. "<span color='"..util.color_strip_alpha(fg_urgent).."'>"..name.."</span>"
    elseif c.minimized and fg_minimize and bg_minimize then
        bg = bg_minimize
        text = text .. "<span color='"..util.color_strip_alpha(fg_minimize).."'>"..name.."</span>"
    else
        text = text .. name
    end
    text = text .. "</span>"
    return text, bg, nil, c.icon
end

local function tasklist_update(s, w, buttons, filter, data, style, template)
    local clients = {}
    for k, c in ipairs(capi.client.get()) do
        if not (c.skip_taskbar or c.hidden
            or c.type == "splash" or c.type == "dock" or c.type == "desktop")
            and filter(c, s) then
            table.insert(clients, c)
        end
    end

    local function label(c) return tasklist_label(c, style) end

    common.list_update(w, buttons, label, data, template, clients)
end

--- Create a new tasklist widget.
-- @param screen The screen to draw tasklist for.
-- @param filter Filter function to define what clients will be listed.
-- @param buttons A table with buttons binding to set.
-- @param style The style overrides default theme.
-- bg_focus The background color for focused client.
-- fg_focus The foreground color for focused client.
-- bg_urgent The background color for urgent clients.
-- fg_urgent The foreground color for urgent clients.
-- bg_minimize The background color for minimized clients.
-- fg_minimize The foreground color for minimized clients.
-- floating_icon The icon for flating clients.
-- font The font.
-- @param template The template to use for each item.
-- The default template:<br/>
-- <code>
-- {<br/>
-- &nbsp; {<br/>
-- &nbsp; &nbsp; item = "icon"<br/>
-- &nbsp; },<br/>
-- &nbsp; {<br/>
-- &nbsp; &nbsp; {<br/>
-- &nbsp; &nbsp; &nbsp; item = "title",<br/>
-- &nbsp; &nbsp; &nbsp; margin = { left  = 2, right = 2 },<br/>
-- &nbsp; &nbsp; &nbsp; bg_resize = true,<br/>
-- &nbsp; &nbsp; &nbsp; bg_align  = "right"<br/>
-- &nbsp; &nbsp; },<br/>
-- &nbsp; &nbsp; layout = layout.horizontal.flex<br/>
-- &nbsp; },<br/>
-- &nbsp; layout = layout.horizontal.leftright<br/>
-- }<br/>
-- </code>
function new(screen, filter, buttons, style, template)
    local w = {
        layout = layout.horizontal.flex
    }
    template = template or {
        {
            item = "icon"
        },
        {
            {
                item = "title",
                margin = { left  = 2, right = 2 },
                bg_resize = true,
                bg_align  = "right"
            },
            layout = layout.horizontal.flex
        },
        layout = layout.horizontal.leftright
    }

    local data = setmetatable({}, { __mode = 'k' })
    local u = function () tasklist_update(screen, w, buttons, filter, data, style, template) end
    for s = 1, capi.screen.count() do
        tag.attached_add_signal(s, "property::filtered", u)
        capi.screen[s]:add_signal("tag::attach", u)
        capi.screen[s]:add_signal("tag::detach", u)
        capi.screen[s]:add_signal("tag::history::update", u)
    end
    capi.client.add_signal("new", function (c)
        c:add_signal("property::urgent", u)
        c:add_signal("property::floating", u)
        c:add_signal("property::maximized_horizontal", u)
        c:add_signal("property::maximized_vertical", u)
        c:add_signal("property::name", u)
        c:add_signal("property::icon_name", u)
        c:add_signal("property::icon", u)
        c:add_signal("property::skip_taskbar", u)
        c:add_signal("property::hidden", u)
        c:add_signal("tagged", u)
        c:add_signal("untagged", u)
    end)
    capi.client.add_signal("unmanage", u)
    capi.client.add_signal("list", u)
    capi.client.add_signal("focus", u)
    capi.client.add_signal("unfocus", u)
    u()
    return w
end

--- Filtering function to include all clients.
-- @param c The client.
-- @param screen The screen we are drawing on.
-- @return true
function filter.allscreen(c, screen)
    return true
end

--- Filtering function to include the clients from all tags on the screen.
-- @param c The client.
-- @param screen The screen we are drawing on.
-- @return true if c is on screen, false otherwise
function filter.alltags(c, screen)
    -- Only print client on the same screen as this widget
    if c.screen ~= screen then return false end
    return true
end

--- Filtering function to include only the clients from currently selected tags.
-- @param c The client.
-- @param screen The screen we are drawing on.
-- @return true if c is in a selected tag on screen, false otherwise
function filter.currenttags(c, screen)
    -- Only print client on the same screen as this widget
    if c.screen ~= screen then return false end
    -- Include sticky client too
    if c.sticky then return true end
    tags = capi.screen[screen]:tags()
    for k, t in ipairs(tags) do
        if t.selected then
            local ctags = c:tags()
            for _, v in ipairs(ctags) do
                if v == t then
                    return true
                end
            end
        end
    end
    return false
end

--- Filtering function to include only the currently focused client.
-- @param c The client.
-- @param screen The screen we are drawing on.
-- @return true if c is focused on screen, false otherwise
function filter.focused(c, screen)
    -- Only print client on the same screen as this widget
    if c.screen == screen and capi.client.focus == c then
        return true
    end
    return false
end

setmetatable(_M, { __call = function(_, ...) return new(...) end })

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