<?php

require_once __DIR__ . '/../config/config.php';
require_once __DIR__ . '/../src/Asignacion.php';
require_once __DIR__ . '/../src/User.php';

class TelegramBot {
    private $token;
    private $apiUrl;

    public function __construct() {
        $config = require __DIR__ . '/../config/config.php';
        $this->token = $config['telegram_bot_token'];
        $this->apiUrl = "https://api.telegram.org/bot{$this->token}";
    }

    private function request($method, $data = []) {
        $url = "{$this->apiUrl}/{$method}";
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
        curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $response = curl_exec($ch);
        curl_close($ch);
        return json_decode($response, true);
    }

    public function sendMessage($chatId, $text, $parseMode = 'HTML', $replyMarkup = null) {
        $data = [
            'chat_id' => $chatId,
            'text' => $text,
            'parse_mode' => $parseMode
        ];
        if ($replyMarkup) {
            $data['reply_markup'] = $replyMarkup;
        }
        return $this->request('sendMessage', $data);
    }

    public function getMe() {
        return $this->request('getMe');
    }

    public function getUpdates($offset = 0) {
        return $this->request('getUpdates', ['offset' => $offset, 'timeout' => 60]);
    }

    public function sendKeyboard($chatId, $text) {
        $keyboard = [
            'inline_keyboard' => [
                [
                    ['text' => 'Ver Turnos', 'callback_data' => 'ver_turnos'],
                    ['text' => 'Semana Actual', 'callback_data' => 'semana_actual']
                ],
                [
                    ['text' => '🔍 Buscar por Nombre', 'callback_data' => 'buscar_nombre']
                ]
            ]
        ];
        
        return $this->sendMessage($chatId, $text, 'HTML', json_encode($keyboard));
    }

    public function answerCallback($callbackId, $text, $showAlert = false) {
        return $this->request('answerCallbackQuery', [
            'callback_query_id' => $callbackId,
            'text' => $text,
            'show_alert' => $showAlert
        ]);
    }

    public function deleteMessage($chatId, $messageId) {
        return $this->request('deleteMessage', [
            'chat_id' => $chatId,
            'message_id' => $messageId
        ]);
    }

    public function editMessage($chatId, $messageId, $text, $keyboard = null) {
        $data = [
            'chat_id' => $chatId,
            'message_id' => $messageId,
            'text' => $text,
            'parse_mode' => 'HTML'
        ];
        if ($keyboard) {
            $data['reply_markup'] = $keyboard;
        }
        return $this->request('editMessageText', $data);
    }

    public function getTablaTurnos($semanas = 4) {
        $asignacion = new Asignacion();
        $ayudantes = $asignacion->getAyudantesPorOrden();
        
        if (empty($ayudantes)) {
            return "No hay ayudantes configurados.";
        }
        
        $hoy = new DateTime();
        $diaSemana = (int)$hoy->format('w');
        $domingo = clone $hoy;
        $domingo->modify('-' . $diaSemana . ' days');
        
        $tabla = "<b>TABLA DE TURNOS</b>\n\n";
        $tabla .= "<code>";
        $tabla .= str_pad("Semana", 10) . " | " . str_pad("Ayudante", 12) . " | Periodo\n";
        $tabla .= str_repeat("-", 45) . "\n";
        
        for ($i = 0; $i < $semanas; $i++) {
            $domingoSemana = clone $domingo;
            $domingoSemana->modify("+{$i} weeks");
            $viernesSemana = clone $domingoSemana;
            $viernesSemana->modify('+5 days');
            
            $posicion = ($i % count($ayudantes));
            $ayudante = $ayudantes[$posicion];
            
            $semanaNum = $i + 1;
            $periodo = $domingoSemana->format('d/m') . '-' . $viernesSemana->format('d/m');
            
            $tabla .= str_pad("Sem $semanaNum", 10) . " | " . 
                     str_pad(substr($ayudante['nombre'], 0, 10), 12) . " | $periodo\n";
        }
        
        $tabla .= "</code>";
        $tabla .= "\n\nCiclo: " . implode(' -> ', array_column($ayudantes, 'nombre'));
        
        return $tabla;
    }

    public function getSemanaActual() {
        $asignacion = new Asignacion();
        
        $hoy = new DateTime();
        $diaSemana = (int)$hoy->format('w');
        $domingo = clone $hoy;
        $domingo->modify('-' . $diaSemana . ' days');
        
        $asignacionActual = $asignacion->getAsignacionPorSemana($domingo->format('Y-m-d'));
        
        if ($asignacionActual) {
            return "<b>SEMANA ACTUAL</b>\n\n" .
                   "Asignado: <b>{$asignacionActual['nombre']}</b>\n" .
                   "Periodo: " . date('d/m/Y', strtotime($asignacionActual['semana_inicio'])) . 
                   " - " . date('d/m/Y', strtotime($asignacionActual['semana_fin'])) . "\n" .
                   "Dias: Domingo a Viernes";
        } else {
            return "No hay asignacion para esta semana.";
        }
    }

    public function getTurnosAyudante($nombre) {
        $config = require __DIR__ . '/../config/config.php';
        
        try {
            $pdo = new PDO(
                "mysql:host={$config['db']['host']};port={$config['db']['port']};dbname={$config['db']['database']};charset=utf8mb4",
                $config['db']['username'],
                $config['db']['password'],
                [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]
            );
        } catch (Exception $e) {
            return "Error de conexion.";
        }
        
        $stmt = $pdo->prepare("SELECT * FROM users WHERE nombre LIKE ? AND rol = 'ayudante' AND activo = 1 LIMIT 1");
        $stmt->execute(["%$nombre%"]);
        $user = $stmt->fetch();
        
        if (!$user) {
            $ayudantes = (new Asignacion())->getAyudantesPorOrden();
            $nombres = implode(', ', array_map(fn($a) => $a['nombre'], $ayudantes));
            return "No encontre '$nombre'.\n\nAyudantes: $nombres";
        }
        
        $stmt = $pdo->prepare("
            SELECT semana_inicio, semana_fin 
            FROM asignaciones_turnos 
            WHERE user_id = ? AND semana_inicio >= CURDATE() 
            ORDER BY semana_inicio 
            LIMIT 4
        ");
        $stmt->execute([$user['id']]);
        $turnos = $stmt->fetchAll();
        
        if (empty($turnos)) {
            return "{$user['nombre']} no tiene turnos proximos.";
        }
        
        $result = "<b>TURNOS DE {$user['nombre']}</b>\n\n";
        
        foreach ($turnos as $turno) {
            $result .= date('d/m/Y', strtotime($turno['semana_inicio'])) . 
                      " - " . date('d/m/Y', strtotime($turno['semana_fin'])) . "\n";
        }
        
        return $result;
    }

    public function getListaAyudantesParaBusqueda() {
        $ayudantes = (new Asignacion())->getAyudantesPorOrden();
        return array_map(fn($a) => $a['nombre'], $ayudantes);
    }
}