-- "Basketweave" Tiling Graphics Element

local util    = require("scada-common.util")

local element = require("graphics.element")

---@class tiling_args
---@field fill_c cpair colors to fill with
---@field even? boolean whether to account for rectangular pixels
---@field border_c? color optional frame color
---@field parent graphics_element
---@field id? string element id
---@field x? integer 1 if omitted
---@field y? integer 1 if omitted
---@field width? integer parent width if omitted
---@field height? integer parent height if omitted
---@field gframe? graphics_frame frame instead of x/y/width/height
---@field fg_bg? cpair foreground/background colors
---@field hidden? boolean true to hide on initial draw

-- new tiling box
---@param args tiling_args
---@return graphics_element element, element_id id
local function tiling(args)
    assert(type(args.fill_c) == "table", "graphics.elements.tiling: fill_c is a required field")

    -- create new graphics element base object
    local e = element.new(args)

    -- draw tiling box

    local fill_a = args.fill_c.blit_a
    local fill_b = args.fill_c.blit_b

    local even = args.even == true

    local start_x = 1
    local start_y = 1
    local inner_width = math.floor(e.frame.w / util.trinary(even, 2, 1))
    local inner_height = e.frame.h
    local alternator = true

    -- border
    if args.border_c ~= nil then
        e.window.setBackgroundColor(args.border_c)
        e.window.clear()

        start_x = 1 + util.trinary(even, 2, 1)
        start_y = 2

        inner_width = math.floor((e.frame.w - 2 * util.trinary(even, 2, 1)) / util.trinary(even, 2, 1))
        inner_height = e.frame.h - 2
    end

    -- check dimensions
    assert(inner_width > 0, "graphics.elements.tiling: inner_width <= 0")
    assert(inner_height > 0, "graphics.elements.tiling: inner_height <= 0")
    assert(start_x <= inner_width, "graphics.elements.tiling: start_x > inner_width")
    assert(start_y <= inner_height, "graphics.elements.tiling: start_y > inner_height")

    -- create pattern
    for y = start_y, inner_height + (start_y - 1) do
        e.window.setCursorPos(start_x, y)
        for _ = 1, inner_width do
            if alternator then
                if even then
                    e.window.blit("  ", "00", fill_a .. fill_a)
                else
                    e.window.blit(" ", "0", fill_a)
                end
            else
                if even then
                    e.window.blit("  ", "00", fill_b .. fill_b)
                else
                    e.window.blit(" ", "0", fill_b)
                end
            end

            alternator = not alternator
        end

        if inner_width % 2 == 0 then alternator = not alternator end
    end

    return e.complete()
end

return tiling