game.lua
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game.lua
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	--[[
	mattata v2.0 - Game Plugin
	Tic-tac-toe with inline keyboard buttons. Two players take turns.
	Game state stored in Redis as JSON.
	]]

	local plugin = {}
	plugin.name = 'game'
	plugin.category = 'fun'
	plugin.description = 'Play tic-tac-toe with another user'
	plugin.commands = { 'game', 'tictactoe' }
	plugin.help = '/game - Start a tic-tac-toe game. Another user clicks a cell to join as O.'

	local json = require('dkjson')

	local EMPTY = ' '
	local X = 'X'
	local O = 'O'

	-- Symbols for display on buttons
	local DISPLAY = {
	[EMPTY] = '\xE2\xAC\x9C', -- white square
	[X] = '\xE2\x9D\x8C', -- cross mark
	[O] = '\xE2\xAD\x95', -- hollow circle
	}

	local function game_key(chat_id, message_id)
	return 'ttt:' .. chat_id .. ':' .. message_id
	end

	local function new_board()
	return {
	EMPTY, EMPTY, EMPTY,
	EMPTY, EMPTY, EMPTY,
	EMPTY, EMPTY, EMPTY
	}
	end

	local WIN_LINES = {
	{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, -- rows
	{1, 4, 7}, {2, 5, 8}, {3, 6, 9}, -- columns
	{1, 5, 9}, {3, 5, 7} -- diagonals
	}

	local function check_winner(board)
	for _, line in ipairs(WIN_LINES) do
	local a, b, c = board[line[1]], board[line[2]], board[line[3]]
	if a ~= EMPTY and a == b and b == c then
	return a
	end
	end
	-- Check for draw
	for _, cell in ipairs(board) do
	if cell == EMPTY then
	return nil -- game still in progress
	end
	end
	return 'draw'
	end

	local function build_keyboard(api, board, game_over)
	local keyboard = api.inline_keyboard()
	for row = 0, 2 do
	local r = api.row()
	for col = 1, 3 do
	local idx = row * 3 + col
	local label = DISPLAY[board[idx]]
	if game_over then
	r:callback_data_button(label, 'game:noop')
	else
	r:callback_data_button(label, 'game:move:' .. idx)
	end
	end
	keyboard:row(r)
	end
	return keyboard
	end

	local function format_status(game_state, winner)
	local tools = require('telegram-bot-lua.tools')
	local x_name = tools.escape_html(game_state.x_name or 'Player X')
	local o_name = tools.escape_html(game_state.o_name or '???')

	if winner == 'draw' then
	return string.format(
	'<b>Tic-Tac-Toe</b>\n%s %s vs %s %s\n\nIt\'s a draw!',
	DISPLAY[X], x_name, DISPLAY[O], o_name
	)
	elseif winner == X then
	return string.format(
	'<b>Tic-Tac-Toe</b>\n%s %s vs %s %s\n\n%s %s wins!',
	DISPLAY[X], x_name, DISPLAY[O], o_name, DISPLAY[X], x_name
	)
	elseif winner == O then
	return string.format(
	'<b>Tic-Tac-Toe</b>\n%s %s vs %s %s\n\n%s %s wins!',
	DISPLAY[X], x_name, DISPLAY[O], o_name, DISPLAY[O], o_name
	)
	else
	local turn_name = game_state.turn == X and x_name or o_name
	local turn_symbol = DISPLAY[game_state.turn]
	if not game_state.o_id then
	return string.format(
	'<b>Tic-Tac-Toe</b>\n%s %s vs %s ???\n\n%s is waiting for an opponent. Click a cell to join!',
	DISPLAY[X], x_name, DISPLAY[O], x_name
	)
	end
	return string.format(
	'<b>Tic-Tac-Toe</b>\n%s %s vs %s %s\n\n%s %s\'s turn',
	DISPLAY[X], x_name, DISPLAY[O], o_name, turn_symbol, turn_name
	)
	end
	end

	function plugin.on_message(api, message, ctx)
	local board = new_board()
	local game_state = {
	board = board,
	turn = X,
	x_id = message.from.id,
	x_name = message.from.first_name or 'Player X',
	o_id = nil,
	o_name = nil
	}

	local status = format_status(game_state, nil)
	local keyboard = build_keyboard(api, board, false)

	local result = api.send_message(message.chat.id, status, 'html', true, false, nil, keyboard)
	if result and result.result and result.result.message_id then
	local key = game_key(message.chat.id, result.result.message_id)
	ctx.redis.setex(key, 3600, json.encode(game_state))
	end
	end

	function plugin.on_callback_query(api, callback_query, message, ctx)
	local data = callback_query.data

	if data == 'noop' then
	return api.answer_callback_query(callback_query.id)
	end

	local idx = tonumber(data:match('^move:(%d+)$'))
	if not idx or idx < 1 or idx > 9 then
	return api.answer_callback_query(callback_query.id, 'Invalid move.')
	end

	local key = game_key(message.chat.id, message.message_id)
	local raw = ctx.redis.get(key)
	if not raw then
	return api.answer_callback_query(callback_query.id, 'This game has expired.')
	end

	local game_state, _ = json.decode(raw)
	if not game_state then
	return api.answer_callback_query(callback_query.id, 'Failed to load game state.')
	end

	local user_id = callback_query.from.id
	local user_name = callback_query.from.first_name or 'Unknown'

	-- If no opponent yet, the first person who clicks (that isn't X) becomes O
	if not game_state.o_id then
	if user_id == game_state.x_id then
	return api.answer_callback_query(callback_query.id, 'Waiting for an opponent to join. Another user must click a cell.')
	end
	game_state.o_id = user_id
	game_state.o_name = user_name
	end

	-- Check it's this user's turn
	local expected_id = game_state.turn == X and game_state.x_id or game_state.o_id
	if user_id ~= expected_id then
	if user_id ~= game_state.x_id and user_id ~= game_state.o_id then
	return api.answer_callback_query(callback_query.id, 'You are not a player in this game.')
	end
	return api.answer_callback_query(callback_query.id, 'It\'s not your turn.')
	end

	-- Check cell is empty
	if game_state.board[idx] ~= EMPTY then
	return api.answer_callback_query(callback_query.id, 'That cell is already taken.')
	end

	-- Make the move
	game_state.board[idx] = game_state.turn
	local winner = check_winner(game_state.board)

	if winner then
	-- Game over
	local status = format_status(game_state, winner)
	local keyboard = build_keyboard(api, game_state.board, true)
	ctx.redis.del(key)
	api.answer_callback_query(callback_query.id)
	return api.edit_message_text(message.chat.id, message.message_id, status, 'html', true, keyboard)
	end

	-- Switch turns
	game_state.turn = game_state.turn == X and O or X
	local status = format_status(game_state, nil)
	local keyboard = build_keyboard(api, game_state.board, false)

	ctx.redis.setex(key, 3600, json.encode(game_state))
	api.answer_callback_query(callback_query.id)
	return api.edit_message_text(message.chat.id, message.message_id, status, 'html', true, keyboard)
	end

	return plugin

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