"""
ENDPOINT /api/predict para recibir trabajos desde tu servidor PHP
"""

from flask import Flask, request, jsonify
import json
import time
import threading
import requests
import hashlib
import hmac

app = Flask(__name__)

# Configuración - CAMBIAR ESTE VALOR
WEBHOOK_SECRET = "AB7k9mJlVQ8xR5vL3wE1sT26Y4oI0pZ9c2V26Bn5M8k7"  # EL MISMO que pusiste en webhook.php
JOBS = {}  # Almacenar estado de trabajos en memoria

def create_webhook_signature(payload, secret):
    """Crear firma HMAC para webhook"""
    return 'sha256=' + hmac.new(
        secret.encode(),
        payload.encode(),
        hashlib.sha256
    ).hexdigest()

def send_webhook(webhook_url, data):
    """Enviar webhook a tu servidor"""
    try:
        payload = json.dumps(data)
        signature = create_webhook_signature(payload, WEBHOOK_SECRET)
        
        headers = {
            'Content-Type': 'application/json',
            'X-Signature': signature
        }
        
        response = requests.post(webhook_url, data=payload, headers=headers)
        print(f"Webhook enviado: {response.status_code}")
        return response.status_code == 200
        
    except Exception as e:
        print(f"Error enviando webhook: {e}")
        return False

def process_audiobook_background(job_id, text, voice, language, webhook_url):
    """Procesar audiolibro en background"""
    try:
        # Actualizar estado: iniciado
        JOBS[job_id]['status'] = 'processing'
        JOBS[job_id]['stage'] = 'preprocessing'
        JOBS[job_id]['progress'] = 0
        
        # Notificar inicio
        send_webhook(webhook_url, {
            'event_type': 'job_started',
            'job_id': job_id,
            'estimated_time': len(text) // 10  # Estimación simple
        })
        
        # Simular progreso (reemplazar con tu lógica real)
        stages = [
            ('preprocessing', 10),
            ('text_analysis', 25),
            ('voice_synthesis', 60),
            ('audio_processing', 85),
            ('finalizing', 95)
        ]
        
        for stage, progress in stages:
            JOBS[job_id]['stage'] = stage
            JOBS[job_id]['progress'] = progress
            
            # Enviar progreso
            send_webhook(webhook_url, {
                'event_type': 'job_progress',
                'job_id': job_id,
                'progress': progress,
                'stage': stage
            })
            
            # Simular tiempo de procesamiento
            time.sleep(10)  # En producción, aquí va tu lógica real
        
        # AQUÍ VA TU LÓGICA REAL DE PROCESAMIENTO
        # audio_file = tu_funcion_de_tts(text, voice, language)
        
        # Por ahora, simular archivo de audio
        audio_url = f"https://tu-space.hf.space/audio/{job_id}.mp3"
        
        # Completar trabajo
        JOBS[job_id]['status'] = 'completed'
        JOBS[job_id]['progress'] = 100
        JOBS[job_id]['audio_url'] = audio_url
        JOBS[job_id]['duration'] = len(text) // 5  # Estimación de duración
        
        # Notificar completación
        send_webhook(webhook_url, {
            'event_type': 'job_completed',
            'job_id': job_id,
            'audio_url': audio_url,
            'duration': JOBS[job_id]['duration']
        })
        
    except Exception as e:
        # Error en procesamiento
        JOBS[job_id]['status'] = 'failed'
        JOBS[job_id]['error'] = str(e)
        
        # Notificar error
        send_webhook(webhook_url, {
            'event_type': 'job_failed',
            'job_id': job_id,
            'error': str(e),
            'error_code': 'PROCESSING_ERROR'
        })

@app.route('/api/predict', methods=['POST'])
def predict():
    """Endpoint principal para recibir trabajos"""
    try:
        data = request.get_json()
        
        # Validar datos requeridos
        required_fields = ['job_id', 'text', 'voice', 'language', 'webhook_url']
        for field in required_fields:
            if field not in data:
                return jsonify({'error': f'Campo requerido: {field}'}), 400
        
        job_id = data['job_id']
        text = data['text']
        voice = data['voice']
        language = data['language']
        webhook_url = data['webhook_url']
        
        # Validaciones
        if len(text) < 10:
            return jsonify({'error': 'Texto demasiado corto'}), 400
        
        if len(text) > 500000:  # 500KB
            return jsonify({'error': 'Texto demasiado largo'}), 400
        
        # Crear registro del trabajo
        JOBS[job_id] = {
            'job_id': job_id,
            'status': 'pending',
            'text_length': len(text),
            'voice': voice,
            'language': language,
            'created_at': time.time(),
            'progress': 0,
            'stage': 'pending'
        }
        
        # Iniciar procesamiento en background
        thread = threading.Thread(
            target=process_audiobook_background,
            args=(job_id, text, voice, language, webhook_url)
        )
        thread.daemon = True
        thread.start()
        
        return jsonify({
            'success': True,
            'job_id': job_id,
            'status': 'started',
            'estimated_time': len(text) // 10,
            'message': 'Procesamiento iniciado'
        })
        
    except Exception as e:
        return jsonify({'error': str(e)}), 500

@app.route('/api/status/<job_id>', methods=['GET'])
def get_status(job_id):
    """Obtener estado de un trabajo"""
    if job_id not in JOBS:
        return jsonify({'error': 'Trabajo no encontrado'}), 404
    
    job = JOBS[job_id]
    return jsonify({
        'job_id': job_id,
        'status': job['status'],
        'progress': job.get('progress', 0),
        'stage': job.get('stage', 'pending'),
        'created_at': job['created_at'],
        'audio_url': job.get('audio_url'),
        'duration': job.get('duration'),
        'error': job.get('error')
    })

@app.route('/api/voices', methods=['GET'])
def get_voices():
    """Obtener lista de voces disponibles"""
    voices = [
        {'id': 'maria', 'name': 'María', 'language': 'es', 'gender': 'female'},
        {'id': 'carlos', 'name': 'Carlos', 'language': 'es', 'gender': 'male'},
        {'id': 'laura', 'name': 'Laura', 'language': 'es', 'gender': 'female'},
        {'id': 'john', 'name': 'John', 'language': 'en', 'gender': 'male'},
        {'id': 'sarah', 'name': 'Sarah', 'language': 'en', 'gender': 'female'},
        {'id': 'james', 'name': 'James', 'language': 'en', 'gender': 'male'},
        {'id': 'marie', 'name': 'Marie', 'language': 'fr', 'gender': 'female'},
        {'id': 'pierre', 'name': 'Pierre', 'language': 'fr', 'gender': 'male'},
        {'id': 'hans', 'name': 'Hans', 'language': 'de', 'gender': 'male'},
        {'id': 'greta', 'name': 'Greta', 'language': 'de', 'gender': 'female'},
        {'id': 'marco', 'name': 'Marco', 'language': 'it', 'gender': 'male'},
        {'id': 'sofia', 'name': 'Sofia', 'language': 'it', 'gender': 'female'},
    ]
    
    return jsonify({
        'success': True,
        'voices': voices
    })

@app.route('/health', methods=['GET'])
def health_check():
    """Health check endpoint"""
    return jsonify({
        'status': 'healthy',
        'active_jobs': len([j for j in JOBS.values() if j['status'] in ['pending', 'processing']]),
        'total_jobs': len(JOBS)
    })

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860)