from flask import Blueprint, request, jsonify, session, current_app
from extensions import db, redis_client
from models import User
from middlewares.auth import login_required
from services.logger import system_logger
import json

# Import Services
from services.system_service import get_system_config_data, get_user_latest_notification, mark_notification_as_read
from services.history_service import get_user_history_data
from services.file_service import handle_file_uploads, get_remote_file_stream
from services.generation_service import (
    validate_generation_request, deduct_points, handle_chat_generation_sync, 
    start_async_image_task, validate_video_request, start_async_video_task
)

api_bp = Blueprint('api', __name__)

@api_bp.route('/api/task_status/<task_id>')
@login_required
def get_task_status(task_id):
    """查询异步任务状态"""
    try:
        data = redis_client.get(f"task:{task_id}")
        if not data:
            return jsonify({"status": "pending"})
        
        if isinstance(data, bytes):
            data = data.decode('utf-8')
        
        return jsonify(json.loads(data))
    except Exception as e:
        system_logger.error(f"查询任务状态异常: {str(e)}")
        return jsonify({"status": "error", "message": "状态查询失败"})

@api_bp.route('/api/config')
def get_config():
    """从本地数据库字典获取配置"""
    try:
        return jsonify(get_system_config_data())
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@api_bp.route('/api/upload', methods=['POST'])
@login_required
def upload():
    try:
        files = request.files.getlist('images')
        img_urls = handle_file_uploads(files)
        system_logger.info(f"用户上传文件: {len(files)} 个", user_id=session.get('user_id'))
        return jsonify({"urls": img_urls})
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@api_bp.route('/api/generate', methods=['POST'])
@login_required
def generate():
    try:
        user_id = session.get('user_id')
        user = db.session.get(User, user_id)
        
        data = request.json if request.is_json else request.form
        
        # 1. 验证请求与权限
        api_key, target_api, cost, use_trial, error = validate_generation_request(user, data)
        if error:
            return jsonify({"error": error}), 400

        # 2. 扣除积分 (如果是试用模式)
        if use_trial:
            deduct_points(user_id, cost)

        model_value = data.get('model')
        prompt = data.get('prompt')
        is_chat_model = "gemini" in model_value.lower() or "gpt" in model_value.lower()

        # 3. 处理聊天模型 (同步)
        if is_chat_model:
            result, status_code = handle_chat_generation_sync(user_id, api_key, model_value, prompt, use_trial, cost)
            return jsonify(result), status_code

        # 4. 构造生图 Payload
        payload = {
            "prompt": prompt,
            "model": model_value,
            "response_format": "url",
            "aspect_ratio": data.get('ratio')
        }
        image_data = data.get('image_data', [])
        if image_data:
            payload["image"] = [img.split(',', 1)[1] if ',' in img else img for img in image_data]
            
        if model_value == "nano-banana-2" and data.get('size'):
            payload["image_size"] = data.get('size')

        # 5. 启动异步生图任务
        app = current_app._get_current_object()
        task_id = start_async_image_task(app, user_id, payload, api_key, target_api, cost, data.get('mode'), model_value)

        return jsonify({
            "task_id": task_id,
            "message": "已开启异步生成任务"
        })
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@api_bp.route('/api/video/generate', methods=['POST'])
@login_required
def video_generate():
    try:
        user_id = session.get('user_id')
        user = db.session.get(User, user_id)
        
        data = request.json
        
        # 1. 验证请求
        model_value, cost, error = validate_video_request(user, data)
        if error:
            return jsonify({"error": error}), 400
            
        # 2. 扣除积分
        deduct_points(user_id, cost)

        # 3. 构造 Payload
        payload = {
            "model": model_value,
            "prompt": data.get('prompt'),
            "enhance_prompt": data.get('enhance_prompt', False),
            "images": data.get('images', []),
            "aspect_ratio": data.get('aspect_ratio', '9:16')
        }

        # 4. 启动异步视频任务
        app = current_app._get_current_object()
        task_id = start_async_video_task(app, user_id, payload, cost, model_value)

        return jsonify({
            "task_id": task_id,
            "message": "视频生成任务已提交，系统正在导演中..."
        })
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@api_bp.route('/api/notifications/latest', methods=['GET'])
@login_required
def get_latest_notification():
    try:
        user_id = session.get('user_id')
        data = get_user_latest_notification(user_id)
        return jsonify(data)
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@api_bp.route('/api/notifications/read', methods=['POST'])
@login_required
def mark_notif_read():
    try:
        user_id = session.get('user_id')
        data = request.json
        notif_id = data.get('id')
        if not notif_id:
            return jsonify({"error": "缺少通知 ID"}), 400
            
        mark_notification_as_read(user_id, notif_id)
        return jsonify({"status": "ok"})
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@api_bp.route('/api/history', methods=['GET'])
@login_required
def get_history():
    try:
        user_id = session.get('user_id')
        page = request.args.get('page', 1, type=int)
        per_page = request.args.get('per_page', 10, type=int)
        filter_type = request.args.get('filter_type', 'all')
        
        data = get_user_history_data(user_id, page, per_page, filter_type)
        return jsonify(data)
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@api_bp.route('/api/stats/points', methods=['GET'])
@login_required
def get_user_point_stats():
    """获取积分统计图表数据"""
    from services.stats_service import get_point_stats
    user_id = session.get('user_id')
    days = request.args.get('days', 7, type=int)
    return jsonify(get_point_stats(user_id, days))

@api_bp.route('/api/stats/details', methods=['GET'])
@login_required
def get_user_point_details():
    """获取积分消耗明细"""
    from services.stats_service import get_point_details
    user_id = session.get('user_id')
    page = request.args.get('page', 1, type=int)
    return jsonify(get_point_details(user_id, page))

@api_bp.route('/api/download_proxy', methods=['GET'])
@login_required
def download_proxy():
    import time
    url = request.args.get('url')
    # 默认文件名逻辑
    default_name = f"video-{int(time.time())}.mp4"
    filename = request.args.get('filename') or default_name
    
    if not url:
        return jsonify({"error": "缺少 URL 参数"}), 400
        
    try:
        req, headers = get_remote_file_stream(url)
        headers['Content-Disposition'] = f'attachment; filename="{filename}"'
        
        def generate():
            for chunk in req.iter_content(chunk_size=4096):
                yield chunk
                
        return current_app.response_class(generate(), headers=headers)
        
    except Exception as e:
        system_logger.error(f"代理下载失败: {str(e)}")
        return jsonify({"error": "下载失败"}), 500