-- Formspec element that governs table columns and their attributes
local tablecolumns = {
	"tablecolumns[color;",
	"text;",
	"text,width=20;",
	"text,width=4;",
	"text,width=4;",
	"text,width=4;",
	"text,width=6;",
	"text,width=6;",
	"text,width=6;",
	"text,width=6]"
}
tablecolumns = table.concat(tablecolumns, "")

local function render_team_stats(red, blue, stat, round)
	local red_stat, blue_stat = red[stat], blue[stat]
	if round then
		red_stat  = math.floor(red_stat  * 10) / 10
		blue_stat = math.floor(blue_stat * 10) / 10
	end
	return red_stat + blue_stat .. " (" ..
			minetest.colorize(red.color, tostring(red_stat)) .. " - " ..
			minetest.colorize(blue.color, tostring(blue_stat)) .. ")"
end

function ctf_stats.get_formspec_match_summary(stats, winner_team, winner_player, time)
	local players = {}
	local red = {
		color = ctf.flag_colors.red:gsub("0x", "#"),
		kills = 0,
		attempts = 0,
		score = 0,
	}
	local blue = {
		color = ctf.flag_colors.blue:gsub("0x", "#"),
		kills = 0,
		attempts = 0,
		score = 0,
	}
	for name, pstat in pairs(stats.red) do
		pstat.name = name
		pstat.color = ctf.flag_colors.red
		table.insert(players, pstat)
		red.kills = red.kills + pstat.kills
		red.attempts = red.attempts + pstat.attempts
		red.score = red.score + pstat.score
	end
	for name, pstat in pairs(stats.blue) do
		pstat.name = name
		pstat.color = ctf.flag_colors.blue
		table.insert(players, pstat)
		blue.kills = blue.kills + pstat.kills
		blue.attempts = blue.attempts + pstat.attempts
		blue.score = blue.score + pstat.score
	end

	local match_length = string.format("%02d:%02d:%02d",
		math.floor(time / 3600),        -- hours
		math.floor((time % 3600) / 60), -- minutes
		math.floor(time % 60))          -- seconds

	local ret = ctf_stats.get_formspec("Match Summary", players, 1)

	if stats[winner_team] then
		local winner_color = ctf.flag_colors[winner_team]:gsub("0x", "#")
		ret = ret .. "item_image[0,0;1,1;ctf_flag:flag_top_"..winner_team.."]"
		ret = ret .. "label[1,0;" .. minetest.colorize(winner_color,
						"TEAM " .. winner_team:upper() .. " WON!") .. "]"
		ret = ret .. "label[1,0.5;Flag captured by " ..
						minetest.colorize(winner_color, winner_player) .. "]"
	else
		ret = ret .. "label[1,0;NO WINNER]"
	end

	ret = ret .. "label[6.5,0;Kills]"
	ret = ret .. "label[8,0;" .. render_team_stats(red, blue, "kills") .. "]"
	ret = ret .. "label[6.5,0.5;Attempts]"
	ret = ret .. "label[8,0.5;" .. render_team_stats(red, blue, "attempts") .. "]"
	ret = ret .. "label[10.5,0;Duration]"
	ret = ret .. "label[12,0;" .. match_length .. "]"
	ret = ret .. "label[10.5,0.5;Total score]"
	ret = ret .. "label[12,0.5;" .. render_team_stats(red, blue, "score", true) .. "]"
	ret = ret .. "label[2,7.75;Tip: type /rankings for league tables]"

	return ret
end

function ctf_stats.get_formspec(title, players, header, hlt_name)
	table.sort(players, function(one, two)
		return one.score > two.score
	end)

	local ret = "size[14," .. 7 + header .. "]"
	ret = ret .. default.gui_bg .. default.gui_bg_img
	ret = ret .. "container[0," .. header .. "]"

	ret = ret .. "vertlabel[0,1;" .. title .. "]"
	ret = ret .. tablecolumns
	ret = ret .. "tableoptions[highlight=#00000000]"
	ret = ret .. "table[0.5,0;13.25,6.1;scores;"
	ret = ret .. "#ffffff,,Player,Kills,Deaths,K/D,Bounty Kills,Captures,Attempts,Score"

	local player_in_top_50 = false

	for i = 1, math.min(#players, 50) do
		local pstat = players[i]
		local color
		if hlt_name and pstat.name == hlt_name then
			color = "#ffff00"
			player_in_top_50 = true
		else
			color = pstat.color or "#ffffff"
		end
		local kd = pstat.kills
		if pstat.deaths > 1 then
			kd = kd / pstat.deaths
		end
		ret = ret ..
			  "," .. string.gsub(color, "0x", "#") ..
			  "," .. i ..
			  "," .. pstat.name ..
			  "," .. pstat.kills ..
			  "," .. pstat.deaths ..
			  "," .. math.floor(kd * 10) / 10  ..
			  "," .. pstat.bounty_kills ..
			  "," .. pstat.captures ..
			  "," .. pstat.attempts ..
			  "," .. math.floor(pstat.score * 10) / 10
	end
	ret = ret .. ";-1]"

	-- If hlt_name not in top 50, add a separate table
	-- This would result in the player's score displayed at the bottom
	-- of the list but yet be visible without having to scroll
	if hlt_name and not player_in_top_50 then
		local hlt_player, hlt_rank, hlt_kd

		for i = 1, #players do
			if players[i].name == hlt_name then
				hlt_player = players[i]
				hlt_rank = i
				break
			end
		end

		if hlt_player then
			hlt_kd = hlt_player.kills
			if hlt_player.deaths > 1 then
				hlt_kd = hlt_kd / hlt_player.deaths
			end

			ret = ret .. tablecolumns
			ret = ret .. "tableoptions[highlight=#00000000]"
			ret = ret .. "table[0.5,6.1;13.25,0.4;hlt_score;"
			ret = ret .. "#ffff00" ..
				  "," .. hlt_rank ..
				  "," .. hlt_player.name ..
				  "," .. hlt_player.kills ..
				  "," .. hlt_player.deaths ..
				  "," .. math.floor(hlt_kd * 10) / 10 ..
				  "," .. hlt_player.bounty_kills ..
				  "," .. hlt_player.captures ..
				  "," .. hlt_player.attempts ..
				  "," .. math.floor(hlt_player.score * 10) / 10 .. ";-1]"
		end
	-- else
		-- ret = ret .. "box[0.5,6.1;13.25,0.4;#101010]"
		-- Adds a box where the extra table should be, in order to make it
		-- appear as an extension of the main table, but the color can't be
		-- matched, and looks slightly brighter or slightly darker than the table
	end

	ret = ret .. "button_exit[10,6.5;3,1;close;Close]"
	ret = ret .. "container_end[]"
	return ret
end

function ctf_stats.get_html(title, players)
	table.sort(players, function(one, two)
		return one.score > two.score
	end)

	local ret = "<h1>" .. title .. "</h1>"
	ret = ret .. "<table>" ..
		"<tr><th></th>" ..
		"<th>Player</th>" ..
		"<th>Kills</th>" ..
		"<th>Deaths</th>" ..
		"<th>K/D ratio</th>" ..
		"<th>Bounty kills</th>" ..
		"<th>Captures</th>" ..
		"<th>Attempts</th>" ..
		"<th>Score</th></tr>"

	for i = 1, math.min(#players, 50) do
		local pstat = players[i]
		local kd = pstat.kills
		if pstat.deaths > 1 then
			kd = kd / pstat.deaths
		end
		ret = ret ..
			"<tr><td>" .. i ..
			"</td><td>" .. pstat.name ..
			"</td><td>" .. pstat.kills ..
			"</td><td>" .. pstat.deaths ..
			"</td><td>" .. math.floor(kd * 10) / 10 ..
			"</td><td>" .. pstat.bounty_kills ..
			"</td><td>" .. pstat.captures ..
			"</td><td>" .. pstat.attempts ..
			"</td><td>" .. math.floor(pstat.score*10)/10 .. "</td></tr>"
	end

	ret = ret .. "</table>\n"
	return ret
end

function ctf_stats.html_to_file(filepath)
	local players = {}
	for name, pstat in pairs(ctf_stats.players) do
		pstat.name = name
		pstat.color = nil
		table.insert(players, pstat)
	end
	local html = ctf_stats.get_html("Player Rankings", players)
	local f = io.open(filepath, "w")
	f:write("<!doctype html>\n")
	f:write("<html><head>\n")
	f:write("<meta charset=\"utf-8\">\n")
	f:write("<title>Player Rankings</title>\n")
	f:write("<link rel=\"stylesheet\" href=\"score_style.css\">\n")
	f:write("</head><body>\n")
	f:write(html)
	f:write("</body></html>\n")
	f:close()
end

local function return_as_chat_result(to, name)
	local players = {}
	for pname, pstat in pairs(ctf_stats.players) do
		pstat.name = pname
		pstat.color = nil
		table.insert(players, pstat)
	end

	table.sort(players, function(one, two)
		return one.score > two.score
	end)

	local place = -1
	local me = nil
	for i = 1, #players do
		local pstat = players[i]
		if pstat.name == name then
			me = pstat
			place = i
			break
		end
	end
	if place < 1 then
		place = #players + 1
	end
	local you_are_in = (to == name) and "You are in " or name .. " is in "
	local result = you_are_in .. place .. " place.\n"
	if me then
		local kd = me.kills
		if me.deaths > 1 then
			kd = kd / me.deaths
		end
		result = result .. "Kills: " .. me.kills ..
			" | Deaths: " .. me.deaths ..
			" | K/D: " .. math.floor(kd * 10) / 10 ..
			"\nBounty kills: " .. me.bounty_kills ..
			" | Captures: " .. me.captures ..
			" | Attempts: " .. me.attempts ..
			"\nScore: " .. math.floor(me.score)
	end
	return true, result
end

minetest.register_chatcommand("r", {
	params = "[<name>]",
	description = "Display rankings of yourself or another player as a chat result.",
	func = function(name, param)
		local target
		if param ~= "" then
			param = param:trim()
			if ctf_stats.players[param] then
				target = param
			else
				return false, "Can't find player '" .. param .. "'"
			end
		else
			target = name
		end
		return return_as_chat_result(name, target)
	end
})

minetest.register_chatcommand("rankings", {
	params = "[<name>]",
	description = "Display rankings of yourself or another player.",
	func = function(name, param)
		local target
		if param ~= "" then
			param = param:trim()
			if ctf_stats.players[param] then
				target = param
			else
				return false, "Can't find player '" .. param .. "'"
			end
		else
			target = name
		end

		if not minetest.get_player_by_name(name) then
			return return_as_chat_result(name, target)
		else
			local players = {}
			for pname, pstat in pairs(ctf_stats.players) do
				pstat.name = pname
				pstat.color = nil
				table.insert(players, pstat)
			end

			local fs = ctf_stats.get_formspec("Player Rankings", players, 0, target)
			minetest.show_formspec(name, "ctf_stats:rankings", fs)
		end
	end
})

local reset_y = {}
minetest.register_chatcommand("reset_rankings", {
	params = "[<name>]",
	description = "Reset the rankings of yourself or another player",
	func = function(name, param)
		param = param:trim()
		if param ~= "" and not minetest.check_player_privs(name, {ctf_admin = true}) then
			return false, "Missing privilege: ctf_admin"
		end

		local reset_name = param == "" and name or param

		if not ctf_stats.players[reset_name] then
			return false, "Player '" .. reset_name .. "' does not exist."
		end

		if reset_name == name and not reset_y[name] then
			reset_y[name] = true
			minetest.after(30, function()
				reset_y[name] = nil
			end)
			return true, "This will reset your stats and rankings completely."
				.. " You will lose access to any special privileges such as the"
				.. " team chest or userlimit skip. This is irreversable. If you're"
				.. " sure, re-type /reset_rankings within 30 seconds to reset."
		end
		reset_y[name] = nil

		ctf_stats.players[reset_name] = nil
		ctf_stats.player(reset_name)
		ctf.needs_save = true
		return true, "Successfully reset the stats and ranking of " .. reset_name
	end
})

minetest.register_chatcommand("transfer_rankings", {
	params = "<src> <dest>",
	description = "Transfer rankings of one player to another.",
	privs = {ctf_admin = true},
	func = function(name, param)
		if not param then
			return false, "Invalid syntax. Provide source and destination player names."
		end
		param = param:trim()
		local src, dest = param:trim():match("([%a%d_-]+) ([%a%d_-]+)")
		if not src or not dest then
			return false, "Invalid usage, see /help transfer_rankings"
		end
		if not ctf_stats.players[src] then
			return false, "Player '" .. src .. "' does not exist."
		end
		if not ctf_stats.players[dest] then
			return false, "Player '" .. dest .. "' does not exist."
		end

		ctf_stats.players[dest] = ctf_stats.players[src]
		ctf_stats.players[src] = nil
		ctf.needs_save = true

		return true, "Stats of '" .. src .. "' have been transferred to '" .. dest .. "'."
	end
})