from flask import Blueprint, request, jsonify
from flask_login import current_user
from models import ParseLog
from models import db
from utils.security import get_client_ip
from utils.limiter import RateLimiter
from utils.queue import ParseQueue, ConcurrencyController
from parsers.factory import ParserFactory
import uuid
import time
from datetime import datetime

parser_bp = Blueprint('parser', __name__)

@parser_bp.route('/parse', methods=['POST'])
def parse_video():
    """解析视频"""
    data = request.get_json()
    video_url = data.get('url')

    if not video_url:
        return jsonify({'success': False, 'message': '请提供视频链接'}), 400

    # 获取用户信息
    user_id = current_user.id if current_user.is_authenticated else None
    ip_address = get_client_ip(request)

    # 检查限流
    limit_check = RateLimiter.check_limit(user_id=user_id, ip_address=ip_address)
    if not limit_check['allowed']:
        return jsonify({
            'success': False,
            'message': f"今日解析次数已达上限（{limit_check['limit']}次）",
            'limit_info': limit_check
        }), 429

    # 检测平台
    try:
        platform = ParserFactory.detect_platform(video_url)
    except ValueError as e:
        return jsonify({'success': False, 'message': str(e)}), 400

    # 生成任务ID
    task_id = str(uuid.uuid4())

    # 添加到队列
    ParseQueue.add_task(task_id, video_url, user_id, ip_address)

    # 尝试立即处理
    if ConcurrencyController.can_process():
        result = _process_task(task_id, video_url, platform, user_id, ip_address)
        return jsonify(result)
    else:
        # 返回任务ID，让前端轮询
        return jsonify({
            'success': True,
            'status': 'queued',
            'task_id': task_id,
            'message': '任务已加入队列，请稍候...',
            'queue_status': ParseQueue.get_queue_status()
        })

@parser_bp.route('/task/<task_id>', methods=['GET'])
def get_task_result(task_id):
    """获取任务结果"""
    result = ParseQueue.get_result(task_id)

    if result:
        return jsonify(result)
    else:
        # 检查是否还在队列中
        queue_status = ParseQueue.get_queue_status()
        return jsonify({
            'success': False,
            'status': 'processing',
            'message': '任务处理中...',
            'queue_status': queue_status
        })

@parser_bp.route('/queue-status', methods=['GET'])
def queue_status():
    """获取队列状态"""
    status = ParseQueue.get_queue_status()
    return jsonify({
        'success': True,
        'queue_status': status
    })

def _process_task(task_id, video_url, platform, user_id, ip_address):
    """处理解析任务"""
    start_time = time.time()

    # 获取该平台所有可用的API
    from models import ParserAPI
    available_apis = ParserAPI.query.filter_by(
        platform=platform.lower(),
        is_enabled=True
    ).all()

    if not available_apis:
        return {
            'success': False,
            'status': 'failed',
            'message': f'没有可用的{platform}解析接口',
            'response_time': int((time.time() - start_time) * 1000)
        }

    last_error = None

    # 尝试所有可用的API
    for api_config in available_apis:
        try:
            # 创建解析器
            parser = ParserFactory.create_parser(api_config)

            # 执行解析
            result = parser.parse(video_url)

            # 计算响应时间
            response_time = int((time.time() - start_time) * 1000)

            # 记录日志
            log = ParseLog(
                user_id=user_id,
                ip_address=ip_address,
                platform=platform,
                video_url=video_url,
                parser_api_id=api_config.id,
                status='success',
                response_time=response_time
            )
            db.session.add(log)

            # 更新API统计
            api_config.total_calls += 1
            api_config.success_calls += 1
            api_config.avg_response_time = int(
                (api_config.avg_response_time * (api_config.total_calls - 1) + response_time) / api_config.total_calls
            )
            api_config.fail_count = 0  # 重置失败计数

            # 更新用户统计
            if user_id:
                from models import User
                user = User.query.get(user_id)
                user.total_parse_count += 1

            # 更新限流计数
            RateLimiter.increment_count(user_id=user_id, ip_address=ip_address, success=True)

            db.session.commit()

            # 保存结果
            response = {
                'success': True,
                'status': 'completed',
                'data': result,
                'response_time': response_time
            }
            ParseQueue.complete_task(task_id, response)

            return response

        except Exception as e:
            # 记录失败，继续尝试下一个API
            last_error = str(e)
            api_config.total_calls += 1
            api_config.fail_count += 1
            db.session.commit()
            continue

    # 所有API都失败了
    # 计算响应时间
    response_time = int((time.time() - start_time) * 1000)

    # 记录失败日志
    log = ParseLog(
        user_id=user_id,
        ip_address=ip_address,
        platform=platform,
        video_url=video_url,
        status='failed',
        error_message=last_error or '所有接口都失败',
        response_time=response_time
    )
    db.session.add(log)

    # 更新限流计数（失败也计数）
    RateLimiter.increment_count(user_id=user_id, ip_address=ip_address, success=False)

    db.session.commit()

    # 保存错误结果
    response = {
        'success': False,
        'status': 'failed',
        'message': last_error or '所有解析接口都失败',
        'response_time': response_time
    }
    ParseQueue.complete_task(task_id, response)

    return response