--[[
Minenews Mod by The-fast-the-curious
https://github.com/The-fast-the-curious/minenews
License: MIT

This mod displays server news to players on login, configurable via a markdown file.
--]]

-- Register bypass priv
minetest.register_privilege("news_bypass", {
	description = "Skip the news display on login.",
	give_to_singleplayer = false
})

-- Create formspec from text file
-- Returns the formspec string on success, or nil if news file is not found or empty
local function get_formspec(name)
	-- Lookup player language preference
	local player_info = minetest.get_player_information(name)
	local lang = player_info.lang_code
	if lang == "" then
		lang = "en"
	end
	-- Lookup news file to display, trying by language first, with a default news.md
	-- fallback.
	local news_filename = minetest.get_worldpath().."/news_"..lang..".md"
	local news_file = io.open(news_filename, "r")
	if not news_file then
		news_filename = minetest.get_worldpath().."/news.md"
		news_file = io.open(news_filename, "r")
	end

	local news = ""
	if news_file then
		news = news_file:read("*a")
		news_file:close()
	end
	
	-- If no news content is found (file doesn't exist or is empty), return nil
	-- to prevent showing an empty formspec.
	if news == "" then
		if news_file then -- Only log if a file existed but was empty
			minetest.log("verbose", "News file found for player "..name.." but it is empty. No formspec will be shown.")
		end
		return nil
	end

	minetest.log("verbose", "Displaying news to player "..name.." in "..lang.." from file "..news_filename)

	-- Settings
	local fg_color = minetest.settings:get("minenews.fg_color") or "#AFAFAF"
	local bg_color = minetest.settings:get("minenews.bg_color") or "#34343400"
	local header_color = minetest.settings:get("minenews.header_color") or "#CFCFCF"
	local mono_color = minetest.settings:get("minenews.mono_color") or "#6ED2CF"
	local discord_link = minetest.settings:get("minenews.discord_invite") or ""

	-- Display the formspec for the server news
	local news_fs = "formspec_version[5]"..
		"size[24,16]"..
		"noprepend[]"..
		"bgcolor["..bg_color.."]"..
		"button_exit[20.8,14.8;3,1;close;OK]"

	if discord_link ~= "" then
		news_fs = news_fs..
			"image[0.2,14.8;1,1;minenews_icon_chat_white.png]"..
			"field[1.3,14.8;19.2,1;discord_invite;;"..discord_link.."]"
	end
	
	-- Render the file as markdown
	local settings = {
		background_color = bg_color,
		font_color = fg_color,
		heading_1_color = header_color,
		heading_2_color = header_color,
		heading_3_color = header_color,
		heading_4_color = header_color,
		heading_5_color = header_color,
		heading_6_color = header_color,
		heading_1_size = "26",
		heading_2_size = "22",
		heading_3_size = "18",
		heading_4_size = "18",
		heading_5_size = "18",
		heading_6_size = "18",
		code_block_mono_color = mono_color,
		code_block_font_size = 14,
		mono_color = mono_color,
		block_quote_color = mono_color,
	}
	news_fs = news_fs..md2f.md2f(0.2, 0.5, 23.6, 13.8, news, "news", settings)
	minetest.log("verbose", "Formspec => "..news_fs)
	return news_fs
end

-- Show news formspec on player join, unless player has bypass priv
local function on_joinplayer(player)
	local name = player:get_player_name()
	if player:get_hp() <= 0 or minetest.get_player_privs(name).news_bypass then
		return
	end

	-- Get the formspec first
	local news_fs = get_formspec(name)
	
	-- Only show the formspec if it's not nil
	if news_fs then
		minetest.show_formspec(name, "news", news_fs)
	end
end
-- Register callback
minetest.register_on_joinplayer(on_joinplayer)

-- Command to display server news at any time
minetest.register_chatcommand("news", {
	description = "Shows server news to the player",
	func = function (name)
		-- Get the formspec first
		local news_fs = get_formspec(name)
		
		-- Only show the formspec if it's not nil
		if news_fs then
			minetest.show_formspec(name, "news", news_fs)
		else
			-- Optional: Give the player feedback that there is no news
			minetest.chat_send_player(name, "There is no news to display at the moment.")
		end
	end
})

-- Exported API
minenews = {}
minenews.on_joinplayer = on_joinplayer