local M = {}

function M.reset(theme)
	vim.opt.background = (theme.variant == "light") and "light" or "dark"
	vim.g.colors_name = theme.name
end

local function list_integrations(theme_name)
	local path = vim.fn.stdpath("config") .. "/lua/themes/" .. theme_name .. "/groups/integrations/"

	local files = {}
	for name, type in vim.fs.dir(path) do
		if type == "file" then
			local mod_name = vim.fn.fnamemodify(name, ":r")
			table.insert(files, mod_name)
		end
	end
	return files
end

function M.apply(theme)
	local base = "themes." .. theme.name
	local P = require(base .. ".palette").get()
	local C = require(base .. ".colors").get(P)

	local modules = {
		require(base .. ".groups.editor"),
		require(base .. ".groups.syntax"),
		require(base .. ".groups.terminal"),
	}

	local exclude = theme.exclude_integrations or {}

	local function should_load(name)
		return not vim.tbl_contains(exclude, name)
	end

	-- auto-discover integrations
	for _, plugin in ipairs(list_integrations(theme.name)) do
		if should_load(plugin) then
			local ok_mod, mod = pcall(require, base .. ".groups.integrations." .. plugin)
			if ok_mod then
				table.insert(modules, mod)
			end
		end
	end

	-- Apply highlights
	for _, mod in ipairs(modules) do
		local groups = mod.get(C) or {}
		for group, opts in pairs(groups) do
			if type(opts) ~= "table" then
				print("Non-table opts detected in group:", group, "value:", vim.inspect(opts))
			end
			local hl = {}

			-- ALT: Use both scenarios
			-- if type(v) == "number" then
			--   hl.ctermfg = v
			-- else
			--   hl.fg = v
			-- end

			for k, v in pairs(opts) do
				if k == "fg" then
					hl.ctermfg = v
				elseif k == "bg" then
					hl.ctermbg = v
				else
					hl[k] = v -- bold, italic, underline, sp, etc.
				end
			end

			vim.api.nvim_set_hl(0, group, hl)
		end
	end
end

return M