local g = vim.g
local util = {}

local has_nvim07 = vim.fn.has("nvim-0.7")

function util.highlight(group, color)
	if has_nvim07 then
		if color.link then
			vim.api.nvim_set_hl(0, group, {
				link = color.link,
			})
		else
			if color.style then
				if color.style ~= "NONE" then
					if type(color.style) == "table" then
						for _, style in ipairs(color.style) do
							color[style] = true
						end
					else
						color[color.style] = true
					end
				end
			end

			color.style = nil
			vim.api.nvim_set_hl(0, group, color)
		end
	else
		-- Doc: :h highlight-gui
		if color.style and type(color.style) == "table" then
			color.style = table.concat(color.style, ",")
		end
		local style = color.style and "gui=" .. color.style or "gui=NONE"
		local fg = color.fg and "guifg=" .. color.fg or "guifg=NONE"
		local bg = color.bg and "guibg=" .. color.bg or "guibg=NONE"
		local sp = color.sp and "guisp=" .. color.sp or ""
		local blend = color.blend and "blend=" .. color.blend or ""
		local hl = "highlight " .. group .. " " .. style .. " " .. fg .. " " .. bg .. " " .. sp .. " " .. blend
		vim.cmd(hl)
		if color.link then
			vim.cmd("highlight! link " .. group .. " " .. color.link)
		end
	end
end

function util.syntax(tbl)
	for group, colors in pairs(tbl) do
		util.highlight(group, colors)
	end
end

function util.properties(tbl)
	for property, value in pairs(tbl) do
		vim.o[property] = value
	end
end

function util.terminal(cp)
	g.terminal_color_0 = cp.overlay0
	g.terminal_color_8 = cp.overlay1

	g.terminal_color_1 = cp.red
	g.terminal_color_9 = cp.red

	g.terminal_color_2 = cp.green
	g.terminal_color_10 = cp.green

	g.terminal_color_3 = cp.yellow
	g.terminal_color_11 = cp.yellow

	g.terminal_color_4 = cp.blue
	g.terminal_color_12 = cp.blue

	g.terminal_color_5 = cp.pink
	g.terminal_color_13 = cp.pink

	g.terminal_color_6 = cp.sky
	g.terminal_color_14 = cp.sky

	g.terminal_color_7 = cp.text
	g.terminal_color_15 = cp.text
end

function util.load(theme)
	vim.cmd("hi clear")
	if vim.fn.exists("syntax_on") then
		vim.cmd("syntax reset")
	end
	g.colors_name = "catppuccin"
	local custom_highlights = require("catppuccin.config").options.custom_highlights

	util.properties(theme.properties)
	util.syntax(theme.base)
	util.syntax(theme.integrations)
	util.syntax(custom_highlights)

	if require("catppuccin.config").options["term_colors"] then
		util.terminal(theme.terminal)
	end
end

-- Credit: https://github.com/EdenEast/nightfox.nvim
local fmt = string.format
local function inspect(t)
  local list = {}
  for k, v in pairs(t) do
    local q = type(v) == "string" and [["]] or ""
    table.insert(list, fmt([[%s = %s%s%s]], k, q, v, q))
  end

  table.sort(list)
  return fmt([[{ %s }]], table.concat(list, ", "))
end

function util.compile(theme)
	if vim.fn.has "nvim-0.7" == 0 then
		print "Compiling requires neovim 0.7"
	end
	local lines = { [[
-- This file is autogenerated by CATPPUCCIN.
-- Do not make changes directly to this file.

vim.cmd("hi clear")
if vim.fn.exists("syntax_on") then
	vim.cmd("syntax reset")
end
vim.g.colors_name = "catppuccin"]] }
	local config = require("catppuccin.config").options
	local custom_highlights = config.custom_highlights
	for property, value in pairs(theme.properties) do
		table.insert(lines, fmt("vim.o.%s = %s", property, value))
	end
	local tbl = vim.tbl_deep_extend("keep", theme.integrations, theme.base)
	tbl = vim.tbl_deep_extend("keep", custom_highlights, tbl)

	for group, color in pairs(tbl) do
		if color.link then
			table.insert(lines, fmt([[vim.api.nvim_set_hl(0, "%s", { link = "%s" })]], group, color.link))
		else
			if color.style then
				if color.style ~= "NONE" then
					if type(color.style) == "table" then
						for _, style in ipairs(color.style) do
							color[style] = true
						end
					else
						color[color.style] = true
					end
				end
			end

			color.style = nil
			vim.api.nvim_set_hl(0, group, color)
			table.insert(lines, fmt([[vim.api.nvim_set_hl(0, "%s", %s)]], group, inspect(color)))
		end
	end

	if config.term_colors then
		local colors = { "overlay0", "red", "green", "yellow", "blue", "pink", "sky", "text", "overlay1", "red", "green", "yellow", "blue", "pink", "sky", "text"}
		for i = 0, 15 do
			table.insert(lines, fmt('vim.g.terminal_color_%d = "%s"', i, theme.terminal[colors[i + 1]]))
		end
	end
	os.execute(string.format("mkdir %s %s", vim.loop.os_uname().sysname == 'Windows' and "" or "-p", config.compile.path))
	print(string.format("mkdir %s %s", vim.loop.os_uname().sysname == 'Windows' and "" or "-p", config.compile.path))
	local file = io.open(config.compile.path .. (vim.loop.os_uname().sysname == 'Windows' and "\\" or "/") .. vim.g.catppuccin_flavour .. config.compile.suffix .. ".lua", "w")
	file:write(table.concat(lines, "\n"))
	file:close()
end

return util