local gsurface = require "gears.surface"
local lgi = require "lgi"
local wibox = require "wibox"
local widgets = require "awesome-wm-nice.widgets"
local wlayout_fixed = require "wibox.layout.fixed"

local gdk = lgi.require("Gdk", "3.0")

local utils = {}

function utils.rel_lighten(lum)
    return lum * 90 + 10
end

function utils.rel_darken(lum)
    return -(lum * 70) + 100
end

-- Returns the hex color for the pixel at the given coordinates on the screen
function utils.get_pixel_at(x, y)
    local pixbuf = gdk.pixbuf_get_from_window(
        gdk.get_default_root_window(),
        x,
        y,
        1,
        1
    )
    local bytes = pixbuf:get_pixels()
    return "#"
        .. bytes:gsub(".", function(c)
            return ("%02x"):format(c:byte())
        end)
end

-- Determines the dominant color of the client's top region
function utils.get_dominant_color(client)
    local color
    -- gsurface(client.content):write_to_png(
    --     "/home/mutex/nice/" .. client.class .. "_" .. client.instance .. ".png")
    local pb
    local bytes
    local tally = {}
    local content = gsurface(client.content)
    local cgeo = client:geometry()
    local x_offset = 2
    local y_offset = 2
    local x_lim = math.floor(cgeo.width / 2)
    for x_pos = 0, x_lim, 2 do
        for y_pos = 0, 8, 1 do
            pb = gdk.pixbuf_get_from_surface(
                content,
                x_offset + x_pos,
                y_offset + y_pos,
                1,
                1
            )
            bytes = pb:get_pixels()
            color = "#"
                .. bytes:gsub(".", function(c)
                    return ("%02x"):format(c:byte())
                end)
            if not tally[color] then
                tally[color] = 1
            else
                tally[color] = tally[color] + 1
            end
        end
    end
    local mode
    local mode_c = 0
    for kolor, kount in pairs(tally) do
        if kount > mode_c then
            mode_c = kount
            mode = kolor
        end
    end
    color = mode
    return color
end

-- Returns a titlebar item
function utils.get_titlebar_item(c, name)
    if name == "close" then
        return widgets.create_titlebar_button(c, name, function()
            c:kill()
        end)
    elseif name == "maximize" then
        return widgets.create_titlebar_button(c, name, function()
            c.maximized = not c.maximized
        end, "maximized")
    elseif name == "minimize" then
        return widgets.create_titlebar_button(c, name, function()
            c.minimized = true
        end)
    elseif name == "ontop" then
        return widgets.create_titlebar_button(c, name, function()
            c.ontop = not c.ontop
        end, "ontop")
    elseif name == "floating" then
        return widgets.create_titlebar_button(c, name, function()
            c.floating = not c.floating
            if c.floating then
                c.maximized = false
            end
        end, "floating")
    elseif name == "sticky" then
        return widgets.create_titlebar_button(c, name, function()
            c.sticky = not c.sticky
            return c.sticky
        end, "sticky")
    elseif name == "title" then
        return widgets.create_titlebar_title(c)
    end
end

-- Creates titlebar items for a given group of item names
-- group can be a string (=item name) or a table (= array of "item-name"s)
function utils.create_titlebar_items(c, group)
    if not group then
        return nil
    end
    if type(group) == "string" then
        return utils.get_titlebar_item(c, group)
    end
    local titlebar_group_items = wibox.widget {
        layout = wlayout_fixed.horizontal,
    }
    local item
    for _, name in ipairs(group) do
        item = utils.get_titlebar_item(c, name)
        if item then
            titlebar_group_items:add(item)
        end
    end
    return titlebar_group_items
end

function utils.validate_mb_bindings(private)
    local action_mbs = {
        "mb_move",
        "mb_contextmenu",
        "mb_resize",
        "mb_win_shade_rollup",
        "mb_win_shade_rolldown",
    }
    local mb_specified = { false, false, false, false, false }
    local mb
    local mb_conflict_test
    for _, action_mb in ipairs(action_mbs) do
        mb = private[action_mb]
        if mb then
            assert(mb >= 1 and mb <= 5, "Invalid mouse button specified!")
            mb_conflict_test = mb_specified[mb]
            if not mb_conflict_test then
                mb_specified[mb] = action_mb
            else
                error(
                    ("%s and %s can not be bound to the same mouse button"):format(
                        action_mb,
                        mb_conflict_test
                    )
                )
            end
        end
    end
end

return utils