local config = require "awesome-wm-nice.config"
local shapes = require "awesome-wm-nice.shapes"
local wibox = require "wibox"
local wlayout_manual = require "wibox.layout.manual"

local shade = {}

-- Legacy global variables
local bottom_edge_height = 3

-- Adds a window shade to the given client
function shade.add_window_shade(c, src_top, src_bottom)
    local geo = c:geometry()
    local w = wibox()
    w.width = geo.width
    w.background = "transparent"
    w.x = geo.x
    w.y = geo.y
    w.height = config.titlebar_height + bottom_edge_height
    w.ontop = true
    w.visible = false
    w.shape = shapes.rounded_rect {
        tl = config.titlebar_radius,
        tr = config.titlebar_radius,
        bl = 4,
        br = 4,
    }
    -- Need to use a manual layout because layout fixed seems to introduce a thin gap
    src_top.point = { x = 0, y = 0 }
    src_top.forced_width = geo.width
    src_bottom.point = { x = 0, y = config.titlebar_height }
    w.widget = { src_top, src_bottom, layout = wlayout_manual }
    -- Clean up resources when a client is killed
    c:connect_signal("request::unmanage", function()
        if c._nice_window_shade then
            c._nice_window_shade.visible = false
            c._nice_window_shade = nil
        end
        -- Clean up
        collectgarbage "collect"
    end)
    c._nice_window_shade_up = false
    c._nice_window_shade = w
end

-- Shows the window contents
function shade.shade_roll_down(c)
    if not c._nice_window_shade_up then
        return
    end
    c:geometry { x = c._nice_window_shade.x, y = c._nice_window_shade.y }
    c:activate()
    c._nice_window_shade.visible = false
    c._nice_window_shade_up = false
end

-- Hides the window contents
function shade.shade_roll_up(c)
    if c._nice_window_shade_up then
        return
    end
    local w = c._nice_window_shade
    local geo = c:geometry()
    w.x = geo.x
    w.y = geo.y
    w.width = geo.width
    c.minimized = true
    w.visible = true
    w.ontop = true
    c._nice_window_shade_up = true
end

-- Toggles the window shade state
function shade.shade_toggle(c)
    c.minimized = not c.minimized
    c._nice_window_shade.visible = c.minimized
end

return shade