local function getLen(str, start_pos)
	local byte = string.byte(str, start_pos)
	if not byte then
		return nil
	end

	return (byte < 0x80 and 1) or (byte < 0xE0 and 2) or (byte < 0xF0 and 3) or (byte < 0xF8 and 4) or 1
end

local function colorize(header, header_color_map, colors)
	for letter, color in pairs(colors) do
		local color_name = "AlphaJemuelKwelKwelWalangTatay" .. letter
		vim.api.nvim_set_hl(0, color_name, color)
		colors[letter] = color_name
	end

	local colorized = {}

	for i, line in ipairs(header_color_map) do
		local colorized_line = {}
		local pos = 0

		for j = 1, #line do
			local start = pos
			pos = pos + getLen(header[i], start + 1)

			local color_name = colors[line:sub(j, j)]
			if color_name then
				table.insert(colorized_line, { color_name, start, pos })
			end
		end

		table.insert(colorized, colorized_line)
	end

	return colorized
end

local M = {}

M.setup = function(dashboard)
	local color = require("util.color")
	local alpha = require("alpha")

	local mocha = require("catppuccin.palettes").get_palette("mocha")

	local color_map = {
		[[      AAAA]],
		[[AAAAAA  AAAA]],
		[[AA    AAAA  AAAA        KKHHKKHHHH]],
		[[AAAA    AAAA  AA    HHBBKKKKKKKKKKKKKK]],
		[[  AAAAAA      AAKKBBHHKKBBYYBBKKKKHHKKKKKK]],
		[[      AAAA  BBAAKKHHBBBBKKKKBBYYBBHHHHKKKKKK]],
		[[        BBAABBKKYYYYHHKKYYYYKKKKBBBBBBZZZZZZ]],
		[[    YYBBYYBBKKYYYYYYYYYYKKKKBBKKAAAAZZOOZZZZ]],
		[[    XXXXYYYYBBYYYYYYYYBBBBBBKKKKBBBBAAAAZZZZ]],
		[[    XXXXUUUUYYYYBBYYYYYYBBKKBBZZOOAAZZOOAAAAAA]],
		[[  ZZZZZZXXUUXXXXYYYYYYYYBBAAAAZZOOOOAAOOZZZZAAAA]],
		[[  ZZUUZZXXUUUUXXXXUUXXFFFFFFFFAAAAOOZZAAZZZZ  AA]],
		[[    RRRRUUUUZZZZZZZZXXOOFFFFOOZZOOAAAAAAZZZZAA]],
		[[    CCSSUUUUZZXXXXZZXXOOFFFFOOZZOOOOZZOOAAAA]],
		[[    CCCCUUUUUUUUUURRRROOFFFFOOZZOOOOZZOOZZZZ]],
		[[    CCCCUUUUUUUUSSCCCCEEQQQQOOZZOOOOZZOOZZZZ]],
		[[    CCCCUUGGUUUUCCCCCCEEQQQQOOZZOOOOZZEEZZ]],
		[[    RRRRGGGGUUGGCCCCCCOOOOOOOOZZOOEEZZII]],
		[[      IIRRGGGGGGCCCCCCOOOOOOOOZZEEII]],
		[[            GGRRCCCCCCOOOOEEEEII  II]],
		[[                RRRRRREEEE  IIII]],
		[[                      II]],
		[[]],
	}

	local yellow = "#FAC87C"
	local orange = "#BF854E"
	local maroon = "#502E2B"
	local brown = "#38291B"
	local colors = {
		["A"] = { fg = mocha.rosewater },
		["Y"] = { fg = yellow },
		["B"] = { fg = color.darken(yellow, 5) },
		["X"] = { fg = color.darken(yellow, 20) },
		["U"] = { fg = color.darken(yellow, 25) },
		["F"] = { fg = color.darken(yellow, 35) },
		["O"] = { fg = color.darken(yellow, 45) },
		["K"] = { fg = maroon },
		["H"] = { fg = color.darken(maroon, 10) },
		["Z"] = { fg = mocha.crust },
		["G"] = { fg = color.darken(yellow, 25) },
		["R"] = { fg = orange },
		["Q"] = { fg = color.darken(orange, 20) },
		["E"] = { fg = color.darken(orange, 35) },
		["I"] = { fg = brown },
		["C"] = { fg = mocha.mantle },
		["S"] = { fg = mocha.subtext1 },
	}

	local header = {}
	for _, line in ipairs(color_map) do
		local header_line = [[]]
		for i = 1, #line do
			if line:sub(i, i) ~= " " then
				header_line = header_line .. "█"
			else
				header_line = header_line .. " "
			end
		end
		table.insert(header, header_line)
	end

	local header_add = [[          N        E      O    B   E E         ]]
	table.insert(header, header_add)

	local hl_add = {}
	for i = 1, #header_add do
		table.insert(hl_add, { "NeoBeeTitle", 1, i })
	end

	dashboard.section.header.val = header
	local colorized = colorize(header, color_map, colors)

	table.insert(colorized, hl_add)

	dashboard.section.header.opts = {
		hl = colorized,
		position = "center",
	}

	dashboard.section.buttons.val = {
		dashboard.button("SPC e e", "  New file", "<Cmd>ene <CR>"),
		dashboard.button("SPC f f", "  Find file"),
		dashboard.button("SPC s s", "  NeoBee config", "<Cmd>Neotree reveal ~/.config/nvim<CR>"),
		dashboard.button("SPC q q", "  Quit", "<Cmd>qa<CR>"),
	}
	for _, a in ipairs(dashboard.section.buttons.val) do
		a.opts.width = 49
		a.opts.cursor = -2
	end

	alpha.setup(dashboard.config)
end

return M