<?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 = [], $httpMethod = 'POST') {
        $url = "{$this->apiUrl}/{$method}";
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        
        // --- MEJORAS ---
        // 1. Forzar el uso de IPv4.
        curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
    
        // 2. Añadir timeouts de seguridad.
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5); // 5 segundos para conectar
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);      // 10 segundos para la transferencia total

        // 3. (ÚLTIMO INTENTO) Forzar versión de TLS.
        curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);

        if ($httpMethod === 'POST') {
            curl_setopt($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_URL, $url);
        } else { // GET request
            $url .= empty($data) ? '' : '?' . http_build_query($data);
            curl_setopt($ch, CURLOPT_URL, $url);
        }

        $response = curl_exec($ch);

        // Añadir manejo de errores de cURL
        if (curl_errno($ch)) {
            error_log("cURL Error en {$method}: " . curl_error($ch));
            curl_close($ch);
            return null;
        }

        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', [], 'GET');
    }

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

    // --- NUEVOS MÉTODOS PARA CENTRALIZAR COMUNICACIONES ---
    public function getWebhookInfo() {
        return $this->request('getWebhookInfo', [], 'GET');
    }

    public function deleteWebhook() {
        return $this->request('deleteWebhook', []);
    }

    public function setWebhook($webhookUrl, $allowedUpdates = ['message', 'callback_query']) {
        return $this->request('setWebhook', [
            'url' => $webhookUrl,
            'allowed_updates' => $allowedUpdates
        ]);
    }


    public function sendKeyboard($chatId, $text) {
        $keyboard = [
            'inline_keyboard' => [
                [
                    ['text' => 'Ver Turnos', 'callback_data' => 'ver_turnos'],
                    ['text' => 'Semana Actual', 'callback_data' => 'semana_actual']
                ],
                [
                    ['text' => '📄 Horarios PDF', 'callback_data' => 'mi_pdf']
                ],
                [
                    ['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' OR rol = 'coordinador') 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);
    }

    public function sendPDF($chatId, $userId) {
        require_once __DIR__ . '/../src/PDFGenerator.php';
        require_once __DIR__ . '/../src/User.php';
        require_once __DIR__ . '/../src/DiasHorarios.php';
        require_once __DIR__ . '/../src/Asignacion.php';
        require_once __DIR__ . '/../src/Database.php';

        $userModel = new User();
        $userData = $userModel->getById($userId);

        if (!$userData) {
            $this->sendMessage($chatId, "Usuario no encontrado.");
            return;
        }

        $horariosModel = new DiasHorarios();
        $asignacionModel = new Asignacion();
        $db = \Database::getInstance()->getConnection();

        $horarios = $horariosModel->getActivos();
        $ayudantes = $asignacionModel->getAyudantesPorOrden();

        $semanasFuturas = [];
        $hoy = new DateTime();
        $diaSemana = (int)$hoy->format('w');
        $domingoEstaSemana = clone $hoy;
        $domingoEstaSemana->modify('-' . $diaSemana . ' days');

        for ($i = 0; $i <= 4; $i++) {
            $semanaDomingo = clone $domingoEstaSemana;
            $semanaDomingo->modify("+{$i} weeks");
            $semanaInicio = $semanaDomingo->format('Y-m-d');
            $asignacionesSemana = $asignacionModel->getTodasAsignacionesPorSemana($semanaInicio);
            $semanasFuturas[] = [
                'inicio' => $semanaInicio,
                'fin' => date('Y-m-d', strtotime('+5 days', strtotime($semanaInicio))),
                'asignaciones' => $asignacionesSemana,
            ];
        }

        $diasNombres = [
            'domingo' => 'Domingo', 'lunes' => 'Lunes', 'martes' => 'Martes',
            'miercoles' => 'Miercoles', 'jueves' => 'Jueves', 'viernes' => 'Viernes', 'sabado' => 'Sabado'
        ];
        $diasOrden = ['domingo', 'lunes', 'martes', 'miercoles', 'jueves', 'viernes', 'sabado'];

        $html = PDFGenerator::getStyles();
        $html .= PDFGenerator::getHeader('Horarios y Turnos - ' . $userData['nombre']);

        $html .= '<h2>Mis Turnos</h2>';
        $html .= '<table><thead><tr><th>Semana</th><th>Periodo</th><th>Estado</th></tr></thead><tbody>';

        foreach ($semanasFuturas as $index => $semana) {
            $esMiTurno = !empty($semana['asignaciones']) && in_array($userId, array_column($semana['asignaciones'], 'id'));
            $html .= '<tr class="' . ($esMiTurno ? 'table-success' : '') . '">';
            $html .= '<td>' . date('d/m/Y', strtotime($semana['inicio']));
            if ($index === 0) {
                $html .= ' <span class="badge badge-primary">Actual</span>';
            }
            if ($esMiTurno) {
                $html .= ' <span class="badge badge-success">Tu turno</span>';
            }
            $html .= '</td>';
            $html .= '<td>' . date('d/m/Y', strtotime($semana['inicio'])) . ' - ' . date('d/m/Y', strtotime($semana['fin'])) . '</td>';
            $html .= '<td>' . ($esMiTurno ? 'Asignado' : 'Sin asignar') . '</td>';
            $html .= '</tr>';
        }
        $html .= '</tbody></table>';

        $html .= '<h2>Horarios por Semana</h2>';
        $html .= '<table><thead><tr><th>Semana</th>';
        foreach ($diasOrden as $dia) {
            $html .= '<th class="text-center">' . $diasNombres[$dia] . '</th>';
        }
        $html .= '</tr></thead><tbody>';

        foreach ($semanasFuturas as $index => $semana) {
            $esMiTurno = !empty($semana['asignaciones']) && in_array($userId, array_column($semana['asignaciones'], 'id'));
            $html .= '<tr class="' . ($esMiTurno ? 'table-success' : '') . '">';
            $html .= '<td>' . date('d/m', strtotime($semana['inicio']));
            if ($index === 0) {
                $html .= ' <span class="badge badge-primary">Actual</span>';
            }
            $html .= '</td>';

            foreach ($diasOrden as $dia) {
                $horarioDia = null;
                foreach ($horarios as $h) {
                    if ($h['dia_semana'] === $dia) {
                        $horarioDia = $h;
                        break;
                    }
                }
                $esActivo = $horarioDia && $horarioDia['activo'];

                if ($esMiTurno && $esActivo) {
                    $html .= '<td class="text-center" style="background-color: #198754; color: white;">';
                    $html .= date('H:i', strtotime($horarioDia['hora_apertura'])) . '<br>' . date('H:i', strtotime($horarioDia['hora_cierre']));
                    $html .= '</td>';
                } elseif (!$esActivo) {
                    $html .= '<td class="text-center text-muted">Cerrado</td>';
                } else {
                    $html .= '<td class="text-center">' . date('H:i', strtotime($horarioDia['hora_apertura'])) . '<br>' . date('H:i', strtotime($horarioDia['hora_cierre'])) . '</td>';
                }
            }
            $html .= '</tr>';
        }
        $html .= '</tbody></table>';
        $html .= PDFGenerator::getFooter();

        $pdfGenerator = new PDFGenerator();
        $pdfContent = $pdfGenerator->generateFromHtml($html);

        $pdfFile = tempnam(sys_get_temp_dir(), 'turnos');
        file_put_contents($pdfFile, $pdfContent);

        $this->sendDocument($chatId, $pdfFile, 'mis-turnos-' . date('Y-m-d') . '.pdf');

        unlink($pdfFile);
    }

    public function sendDocument($chatId, $documentPath, $filename) {
        $url = "{$this->apiUrl}/sendDocument";
        $postFields = [
            'chat_id' => $chatId,
            'document' => new CURLFile($documentPath, 'application/pdf', $filename)
        ];

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_exec($ch);
        curl_close($ch);
    }

    public function sendPDFGeneral($chatId) {
        require_once __DIR__ . '/../src/PDFGenerator.php';
        require_once __DIR__ . '/../src/User.php';
        require_once __DIR__ . '/../src/DiasHorarios.php';
        require_once __DIR__ . '/../src/Asignacion.php';
        require_once __DIR__ . '/../src/Database.php';

        $userModel = new User();
        $horariosModel = new DiasHorarios();
        $asignacionModel = new Asignacion();
        $db = \Database::getInstance()->getConnection();

        $horarios = $horariosModel->getActivos();
        $ayudantes = $asignacionModel->getAyudantesPorOrden();

        $semanasFuturas = [];
        $hoy = new DateTime();
        $diaSemana = (int)$hoy->format('w');
        $domingoEstaSemana = clone $hoy;
        $domingoEstaSemana->modify('-' . $diaSemana . ' days');

        for ($i = 0; $i <= 4; $i++) {
            $semanaDomingo = clone $domingoEstaSemana;
            $semanaDomingo->modify("+{$i} weeks");
            $semanaInicio = $semanaDomingo->format('Y-m-d');
            $asignacionesSemana = $asignacionModel->getTodasAsignacionesPorSemana($semanaInicio);
            $semanasFuturas[] = [
                'inicio' => $semanaInicio,
                'fin' => date('Y-m-d', strtotime('+5 days', strtotime($semanaInicio))),
                'asignaciones' => $asignacionesSemana,
            ];
        }

        $diasNombres = [
            'domingo' => 'Domingo', 'lunes' => 'Lunes', 'martes' => 'Martes',
            'miercoles' => 'Miercoles', 'jueves' => 'Jueves', 'viernes' => 'Viernes', 'sabado' => 'Sabado'
        ];
        $diasOrden = ['domingo', 'lunes', 'martes', 'miercoles', 'jueves', 'viernes', 'sabado'];

        $html = PDFGenerator::getStyles();
        $html .= PDFGenerator::getHeader('Horarios y Turnos - Todos los Ayudantes');

        $html .= '<h2>Turnos de Ayudantes</h2>';
        $html .= '<table><thead><tr><th>Ayudante</th><th>Fecha 1</th><th>Fecha 2</th><th>Fecha 3</th><th>Fecha 4</th></tr></thead><tbody>';

        foreach ($ayudantes as $ayudante) {
            $stmt = $db->prepare("SELECT semana_inicio, semana_fin FROM asignaciones_turnos WHERE user_id = ? AND semana_inicio >= CURDATE() ORDER BY semana_inicio LIMIT 4");
            $stmt->execute([$ayudante['id']]);
            $turnos = $stmt->fetchAll();
            
            $html .= '<tr>';
            $html .= '<td>' . htmlspecialchars($ayudante['nombre']) . '</td>';
            for ($i = 0; $i < 4; $i++) {
                if (isset($turnos[$i])) {
                    $html .= '<td class="text-center">' . date('d/m/Y', strtotime($turnos[$i]['semana_inicio'])) . ' - ' . date('d/m/Y', strtotime($turnos[$i]['semana_fin'])) . '</td>';
                } else {
                    $html .= '<td class="text-center text-muted">-</td>';
                }
            }
            $html .= '</tr>';
        }
        $html .= '</tbody></table>';

        $html .= '<h2>Horarios por Semana</h2>';
        $html .= '<table><thead><tr><th>Semana</th>';
        foreach ($diasOrden as $dia) {
            $html .= '<th class="text-center">' . $diasNombres[$dia] . '</th>';
        }
        $html .= '</tr></thead><tbody>';

        foreach ($semanasFuturas as $index => $semana) {
            $html .= '<tr>';
            $html .= '<td>' . date('d/m', strtotime($semana['inicio']));
            if ($index === 0) {
                $html .= ' <span class="badge badge-primary">Actual</span>';
            }
            $html .= '</td>';

            foreach ($diasOrden as $dia) {
                $horarioDia = null;
                foreach ($horarios as $h) {
                    if ($h['dia_semana'] === $dia) {
                        $horarioDia = $h;
                        break;
                    }
                }
                $esActivo = $horarioDia && $horarioDia['activo'];
                
                if ($esActivo) {
                    $html .= '<td class="text-center">' . date('H:i', strtotime($horarioDia['hora_apertura'])) . '<br>' . date('H:i', strtotime($horarioDia['hora_cierre'])) . '</td>';
                } else {
                    $html .= '<td class="text-center text-muted">Cerrado</td>';
                }
            }
            $html .= '</tr>';
        }
        $html .= '</tbody></table>';

        $html .= '<h2>Horarios de Apertura</h2>';
        $html .= '<table><thead><tr><th>Dia</th><th>Hora Apertura</th><th>Hora Cierre</th><th>Estado</th></tr></thead><tbody>';
        foreach ($horarios as $h) {
            $html .= '<tr>';
            $html .= '<td>' . ucfirst($h['dia_semana']) . '</td>';
            $html .= '<td>' . date('H:i', strtotime($h['hora_apertura'])) . '</td>';
            $html .= '<td>' . date('H:i', strtotime($h['hora_cierre'])) . '</td>';
            $html .= '<td>' . ($h['activo'] ? 'Abierto' : 'Cerrado') . '</td>';
            $html .= '</tr>';
        }
        $html .= '</tbody></table>';
        $html .= PDFGenerator::getFooter();

        $pdfGenerator = new PDFGenerator();
        $pdfContent = $pdfGenerator->generateFromHtml($html);

        $pdfFile = tempnam(sys_get_temp_dir(), 'turnos');
        file_put_contents($pdfFile, $pdfContent);

        $this->sendDocument($chatId, $pdfFile, 'turnos-contenedor-' . date('Y-m-d') . '.pdf');

        unlink($pdfFile);
    }
}