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

-- Grab environment we need
local ipairs = ipairs
local pairs = pairs
local table = table
local otable = otable
local capi =
{
    screen = screen,
    client = client,
    button = button,
    widget = widget,
    mouse = mouse
}
local util = require("awful.util")
local hooks = require("awful.hooks")
local beautiful = require("beautiful")
local menu = require("awful.menu")

--- Widget module for awful
module("awful.widget")

-- Various public structures
taglist = {}
taglist.label = {}
tasklist = {}
tasklist.label = {}

local function taglist_update (screen, w, label, buttons, data)
    local tags = capi.screen[screen]:tags()
    -- Hack: if it has been registered as a widget in a wibox,
    -- it's w.len since __len meta does not work on table until Lua 5.2.
    -- Otherwise it's standard #w.
    local len = w.len or #w
    -- Add more widgets
    if len < #tags then
        for i = len + 1, #tags do
            w[i] = capi.widget({ type = "textbox" })
        end
    -- Remove widgets
    elseif len > #tags then
        for i = #tags + 1, len do
            w[i] = nil
        end
    end
    -- Update widgets text
    for k, tag in ipairs(tags) do
        w[k].text = label(tag)
        if buttons then
            if not data[tag] then
                -- Replace press function by a new one calling with tags as
                -- argument.
                -- This is done here because order of tags can change
                data[tag] = {}
                for kb, b in ipairs(buttons) do
                    -- Copy object
                    data[tag][kb] = capi.button(b)
                    data[tag][kb].press = function () b.press(tag) end
                end
            end
            w[k]:buttons(data[tag])
        end
    end
end

--- Create a new taglist widget.
-- @param screen The screen to draw tag list for.
-- @param label Label function to use.
-- @param buttons A table with buttons binding to set.
function taglist.new(screen, label, buttons)
    local w = {}
    local data = otable()
    local u = function (s)
        if s == screen then
            taglist_update(s, w, label, buttons, data)
        end
    end
    local uc = function (c) return u(c.screen) end
    hooks.focus.register(uc)
    hooks.unfocus.register(uc)
    hooks.arrange.register(u)
    hooks.tags.register(u)
    hooks.tagged.register(uc)
    hooks.property.register(function (c, prop)
        if prop == "urgent" then
            u(c.screen)
        end
    end)
    -- Free data on tag removal
    hooks.tags.register(function (s, tag, action)
        if action == "remove" then data[tag] = nil end
    end)
    u(screen)
    return w
end

--- Return labels for a taglist widget with all tag from screen.
-- It returns the tag name and set a special
-- foreground and background color for selected tags.
-- @param t The tag.
-- @param args The arguments table.
-- bg_focus The background color for selected tag.
-- fg_focus The foreground color for selected tag.
-- bg_urgent The background color for urgent tags.
-- fg_urgent The foreground color for urgent tags.
-- squares_sel Optional: a user provided image for selected squares.
-- squares_unsel Optional: a user provided image for unselected squares.
-- squares_resize Optional: true or false to resize squares.
-- @return A string to print.
function taglist.label.all(t, args)
    if not args then args = {} end
    local theme = beautiful.get()
    local fg_focus = args.fg_focus or theme.taglist_fg_focus or theme.fg_focus
    local bg_focus = args.bg_focus or theme.taglist_bg_focus or theme.bg_focus
    local fg_urgent = args.fg_urgent or theme.taglist_fg_urgent or theme.fg_urgent
    local bg_urgent = args.bg_urgent or theme.taglist_bg_urgent or theme.bg_urgent
    local taglist_squares_sel = args.squares_sel or theme.taglist_squares_sel
    local taglist_squares_unsel = args.squares_unsel or theme.taglist_squares_unsel
    local taglist_squares_resize = theme.taglist_squares_resize or args.squares_resize or "true"
    local font = args.font or theme.taglist_font or theme.font or ""
    local text = "<span font_desc='"..font.."'>"
    local background = ""
    local sel = capi.client.focus
    local bg_color = nil
    local fg_color = nil
    if t.selected then
        bg_color = bg_focus
        fg_color = fg_focus
    end
    if sel and sel:tags()[t] then
        if taglist_squares_sel then
            background = "resize=\"" .. taglist_squares_resize .. "\" image=\"" .. taglist_squares_sel .. "\""
        end
    else
        local cls = t:clients()
        if #cls > 0 and taglist_squares_unsel then
            background = "resize=\"" .. taglist_squares_resize .. "\" image=\"" .. taglist_squares_unsel .. "\""
        end
        for k, c in pairs(cls) do
            if c.urgent then
                if bg_urgent then bg_color = bg_urgent end
                if fg_urgent then fg_color = fg_urgent end
                break
            end
        end
    end
    if bg_color and fg_color then
        text = text .. "<bg "..background.." color='"..bg_color.."'/> <span color='"..util.color_strip_alpha(fg_color).."'>"..util.escape(t.name).."</span> "
    else
        text = text .. " <bg "..background.." />"..util.escape(t.name).." "
    end
    text = text .. "</span>"
    return text
end

--- Return labels for a taglist widget with all *non empty* tags from screen.
-- It returns the tag name and set a special
-- foreground and background color for selected tags.
-- @param t The tag.
-- @param args The arguments table.
-- bg_focus The background color for selected tag.
-- fg_focus The foreground color for selected tag.
-- bg_urgent The background color for urgent tags.
-- fg_urgent The foreground color for urgent tags.
-- @return A string to print.
function taglist.label.noempty(t, args)
    if #t:clients() > 0 or t.selected then
        return taglist.label.all(t, args)
    end
end

local function tasklist_update(w, buttons, label, data)
    local clients = capi.client.get()
    local shownclients = {}
    for k, c in ipairs(clients) do
        if not (c.skip_taskbar or c.hide
            or c.type == "splash" or c.type == "dock" or c.type == "desktop") then
            table.insert(shownclients, c)
        end
    end
    clients = shownclients
    -- Hack: if it has been registered as a widget in a wibox,
    -- it's w.len since __len meta does not work on table until Lua 5.2.
    -- Otherwise it's standard #w.
    local len = (w.len or #w) / 2
    -- Add more widgets
    if len < #clients then
        for i = len * 2 + 1, #clients * 2, 2 do
            w[i] = capi.widget({ type = "imagebox", align = "flex" })
            w[i + 1] = capi.widget({ type = "textbox", align = "flex" })
        end
    -- Remove widgets
    elseif len > #clients then
        for i = #clients * 2 + 1, len * 2, 2 do
            w[i] = nil
            w[i + 1] = nil
        end
    end
    -- Update widgets text
    for k = 1, #clients * 2, 2 do
        if buttons then
            local c = clients[(k + 1) / 2]
            if not data[c] then
                data[c] = {}
                -- Replace press function by a new one calling with tags as
                -- argument
                for kb, b in ipairs(buttons) do
                    -- Copy object
                    data[c][kb] = capi.button(b)
                    data[c][kb].press = function () b.press(c) end
                end
            end
            w[k]:buttons(data[c])
            w[k + 1]:buttons(data[c])
        end
        w[k + 1].text, w[k].bg = label(clients[(k + 1) / 2])
        if w[k + 1].text  then
            -- Set icon
            w[k].image = clients[(k + 1) / 2].icon
            if w[k].image then
                w[k].visible = true
            else
                w[k].visible = false
            end
            w[k + 1].visible = true
        else
            w[k].visible = false
            w[k + 1].visible = false
        end
    end
end

--- Create a new tasklist widget.
-- @param label Label function to use.
-- @param buttons A table with buttons binding to set.
function tasklist.new(label, buttons)
    local w = {}
    local data = otable()
    local u = function () tasklist_update(w, buttons, label, data) end
    hooks.arrange.register(u)
    hooks.clients.register(u)
    hooks.tagged.register(u)
    hooks.focus.register(u)
    hooks.unfocus.register(u)
    hooks.property.register(function (c, prop)
        if prop == "urgent"
            or prop == "floating"
            or prop == "maximized_horizontal"
            or prop == "maximized_vertical"
            or prop == "icon"
            or prop == "name"
            or prop == "icon_name" then
            u()
        end
    end)
    u()
    -- Free data on unmanage
    hooks.unmanage.register(function (c) data[c] = nil end)
    return w
end

local function widget_tasklist_label_common(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 floating_icon = args.floating_icon or theme.tasklist_floating_icon
    local floating_icon_align = args.floating_icon_align or theme.tasklist_floating_icon_align or "right"
    local font = args.font or theme.tasklist_font or theme.font or ""
    local bg = nil
    local text = "<margin left=\"2\" right=\"2\"/><span font_desc='"..font.."'>"
    local name
    if c.floating and floating_icon then
        text = text.."<bg image=\"" .. floating_icon .. "\" align=\"" .. floating_icon_align .. "\"/>"
    end
    if c.minimized then
        name = util.escape(c.icon_name) or ""
    else
        name = util.escape(c.name) or ""
    end
    if capi.client.focus == c then
        if bg_focus and fg_focus then
            bg = bg_focus
            text = text .. "<bg color='"..bg_focus.."'/><span color='"..util.color_strip_alpha(fg_focus).."'>"..name.."</span>"
        else
            text = text .. name
        end
    elseif c.urgent and bg_urgent and fg_urgent then
        bg = bg_urgent
        text = text .. "<bg color='"..bg_urgent.."'/><span color='"..util.color_strip_alpha(fg_urgent).."'>"..name.."</span>"
    else
        text = text .. name
    end
    text = text .. "</span>"
    return text, bg
end

--- Return labels for a tasklist widget with clients from all tags and screen.
-- It returns the client name and set a special
-- foreground and background color for focused client.
-- It also puts a special icon for floating windows.
-- @param c The client.
-- @param screen The screen we are drawing on.
-- @param args The arguments table.
-- 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.
-- @return A string to print.
function tasklist.label.allscreen(c, screen, args)
    return widget_tasklist_label_common(c, args)
end

--- Return labels for a tasklist widget with clients from all tags.
-- It returns the client name and set a special
-- foreground and background color for focused client.
-- It also puts a special icon for floating windows.
-- @param c The client.
-- @param screen The screen we are drawing on.
-- @param args The arguments table.
-- 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.
-- @return A string to print.
function tasklist.label.alltags(c, screen, args)
    -- Only print client on the same screen as this widget
    if c.screen ~= screen then return end
    return widget_tasklist_label_common(c, args)
end

--- Return labels for a tasklist widget with clients from currently selected tags.
-- It returns the client name and set a special
-- foreground and background color for focused client.
-- It also puts a special icon for floating windows.
-- @param c The client.
-- @param screen The screen we are drawing on.
-- @param args The arguments table.
-- 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.
-- @return A string to print.
function tasklist.label.currenttags(c, screen, args)
    -- Only print client on the same screen as this widget
    if c.screen ~= screen then return end
    for k, t in ipairs(capi.screen[screen]:tags()) do
        if t.selected and c:tags()[t] then
            return widget_tasklist_label_common(c, args)
        end
    end
end

--- Create a button widget. When clicked, the image is deplaced to make it like
-- a real button.
-- @param args Standard widget table arguments, plus image for the image path.
-- @return A textbox widget configured as a button.
function button(args)
    if not args or not args.image then return end
    args.type = "textbox"
    local w = capi.widget(args)
    local img_release = "<bg image=\"" .. args.image .. "\" resize=\"true\"/>"
    local img_press = "<bg_margin top=\"2\" left=\"2\"/><bg image=\"" .. args.image .. "\" resize=\"true\"/>"
    w.text = img_release
    w:buttons({ capi.button({}, 1, function () w.text = img_press end, function () w.text = img_release end) })
    function w.mouse_leave(s) w.text = img_release end
    function w.mouse_enter(s) if capi.mouse.coords().buttons[1] then w.text = img_press end end
    return w
end

--- Create a button widget which will launch a command.
-- @param args Standard widget table arguments, plus image for the image path
-- and command for the command to run on click, or either menu to create menu.
-- @return A launcher widget.
function launcher(args)
    if not args.command and not args.menu then return end
    local w = button(args)
    if not w then return end
    local b = w:buttons()

    if args.command then
       b[#b + 1] = capi.button({}, 1, nil, function () util.spawn(args.command) end)
    elseif args.menu then
       b[#b + 1] = capi.button({}, 1, nil, function () args.menu:toggle() end)
    end

    w:buttons(b)
    return w
end

-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80