from flask import Blueprint, request, jsonify, send_file
import os
import threading
import time
import uuid
from src.mock_scraper import MockVideoScraper
import logging

# Cấu hình logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

video_bp = Blueprint('video', __name__)

# Dictionary để lưu trạng thái các job
video_jobs = {}

class VideoJob:
    def __init__(self, job_id, prompt):
        self.job_id = job_id
        self.prompt = prompt
        self.status = "pending"  # pending, processing, completed, failed
        self.video_path = None
        self.error_message = None
        self.created_at = time.time()

def generate_video_async(job_id, prompt):
    """Tạo video bất đồng bộ"""
    job = video_jobs[job_id]
    job.status = "processing"
    
    scraper = None
    try:
        logger.info(f"Bắt đầu tạo video cho job {job_id} với prompt: {prompt}")
        scraper = MockVideoScraper(headless=True)
        
        video_path = scraper.generate_video_simple(prompt, timeout=300)
        
        if video_path and os.path.exists(video_path):
            job.video_path = video_path
            job.status = "completed"
            logger.info(f"Job {job_id} hoàn thành thành công")
        else:
            job.status = "failed"
            job.error_message = "Không thể tạo video"
            logger.error(f"Job {job_id} thất bại: Không thể tạo video")
            
    except Exception as e:
        job.status = "failed"
        job.error_message = str(e)
        logger.error(f"Job {job_id} thất bại với lỗi: {e}")
    finally:
        if scraper:
            scraper.close()

@video_bp.route('/generate/<path:prompt>', methods=['GET'])
def generate_video_endpoint(prompt):
    """
    Endpoint để tạo video từ prompt
    URL: /api/video/generate/your_prompt_here
    """
    try:
        # Tạo job ID duy nhất
        job_id = str(uuid.uuid4())
        
        # Tạo job mới
        job = VideoJob(job_id, prompt)
        video_jobs[job_id] = job
        
        # Bắt đầu tạo video trong thread riêng
        thread = threading.Thread(target=generate_video_async, args=(job_id, prompt))
        thread.daemon = True
        thread.start()
        
        return jsonify({
            "success": True,
            "job_id": job_id,
            "message": "Video generation started",
            "status_url": f"/api/video/status/{job_id}",
            "download_url": f"/api/video/download/{job_id}"
        }), 202
        
    except Exception as e:
        logger.error(f"Lỗi khi tạo job: {e}")
        return jsonify({
            "success": False,
            "error": str(e)
        }), 500

@video_bp.route('/status/<job_id>', methods=['GET'])
def get_job_status(job_id):
    """Kiểm tra trạng thái job"""
    if job_id not in video_jobs:
        return jsonify({
            "success": False,
            "error": "Job not found"
        }), 404
    
    job = video_jobs[job_id]
    
    response = {
        "success": True,
        "job_id": job_id,
        "status": job.status,
        "prompt": job.prompt,
        "created_at": job.created_at
    }
    
    if job.status == "failed" and job.error_message:
        response["error"] = job.error_message
    
    if job.status == "completed" and job.video_path:
        response["download_url"] = f"/api/video/download/{job_id}"
        response["video_ready"] = True
    
    return jsonify(response)

@video_bp.route('/download/<job_id>', methods=['GET'])
def download_video(job_id):
    """Tải xuống video"""
    if job_id not in video_jobs:
        return jsonify({
            "success": False,
            "error": "Job not found"
        }), 404
    
    job = video_jobs[job_id]
    
    if job.status != "completed" or not job.video_path:
        return jsonify({
            "success": False,
            "error": "Video not ready",
            "status": job.status
        }), 400
    
    if not os.path.exists(job.video_path):
        return jsonify({
            "success": False,
            "error": "Video file not found"
        }), 404
    
    try:
        return send_file(
            job.video_path,
            as_attachment=True,
            download_name=f"video_{job_id}.mp4",
            mimetype='video/mp4'
        )
    except Exception as e:
        logger.error(f"Lỗi khi tải xuống video: {e}")
        return jsonify({
            "success": False,
            "error": "Failed to download video"
        }), 500

@video_bp.route('/jobs', methods=['GET'])
def list_jobs():
    """Liệt kê tất cả jobs"""
    jobs_list = []
    for job_id, job in video_jobs.items():
        job_info = {
            "job_id": job_id,
            "prompt": job.prompt,
            "status": job.status,
            "created_at": job.created_at
        }
        if job.status == "completed":
            job_info["download_url"] = f"/api/video/download/{job_id}"
        jobs_list.append(job_info)
    
    return jsonify({
        "success": True,
        "jobs": jobs_list,
        "total": len(jobs_list)
    })

@video_bp.route('/health', methods=['GET'])
def health_check():
    """Health check endpoint"""
    return jsonify({
        "success": True,
        "message": "Video generation API is running",
        "active_jobs": len([j for j in video_jobs.values() if j.status == "processing"]),
        "total_jobs": len(video_jobs)
    })

# Cleanup old jobs (older than 1 hour)
def cleanup_old_jobs():
    """Dọn dẹp các job cũ"""
    current_time = time.time()
    to_remove = []
    
    for job_id, job in video_jobs.items():
        if current_time - job.created_at > 3600:  # 1 hour
            to_remove.append(job_id)
            # Xóa file video nếu có
            if job.video_path and os.path.exists(job.video_path):
                try:
                    os.remove(job.video_path)
                except:
                    pass
    
    for job_id in to_remove:
        del video_jobs[job_id]
    
    logger.info(f"Cleaned up {len(to_remove)} old jobs")

# Chạy cleanup mỗi 30 phút
import atexit
cleanup_timer = None

def start_cleanup_timer():
    global cleanup_timer
    cleanup_timer = threading.Timer(1800, cleanup_old_jobs)  # 30 minutes
    cleanup_timer.daemon = True
    cleanup_timer.start()

def stop_cleanup_timer():
    global cleanup_timer
    if cleanup_timer:
        cleanup_timer.cancel()

atexit.register(stop_cleanup_timer)
start_cleanup_timer()