from flask import request, jsonify, current_app
from datetime import datetime
from app import db
from app.models import Product, License, Device, Version
from . import api_bp
from .decorators import require_login, require_admin
from sqlalchemy import func, case
import traceback
import sys
from app.utils.logger import log_operation

@api_bp.route('/products', methods=['GET'])
@require_login
def get_products():
    """获取产品列表"""
    try:
        page = request.args.get('page', 1, type=int)
        per_page = min(request.args.get('per_page', 20, type=int), 100)
        keyword = request.args.get('keyword', '').strip()
        include_stats = request.args.get('include_stats', 'true').lower() == 'true'

        query = Product.query

        if keyword:
            query = query.filter(
                Product.product_name.like(f'%{keyword}%') |
                Product.description.like(f'%{keyword}%')
            )

        query = query.order_by(Product.create_time.desc())
        pagination = query.paginate(page=page, per_page=per_page, error_out=False)

        products = pagination.items
        
        # 优化：批量查询统计信息，避免N+1查询问题
        if include_stats and products:
            product_ids = [p.product_id for p in products]
            
            # 批量查询license统计
            license_stats = db.session.query(
                License.product_id,
                func.count(License.license_id).label('total_licenses'),
                func.sum(case((License.status == 1, 1), else_=0)).label('active_licenses')
            ).filter(License.product_id.in_(product_ids)).group_by(License.product_id).all()
            
            license_dict = {pid: {'total': 0, 'active': 0} for pid in product_ids}
            for stat in license_stats:
                license_dict[stat.product_id] = {
                    'total': stat.total_licenses or 0,
                    'active': stat.active_licenses or 0
                }
            
            # 批量查询device统计
            device_stats = db.session.query(
                Device.product_id,
                func.count(Device.device_id).label('total_devices')
            ).filter(
                Device.product_id.in_(product_ids),
                Device.status == 1
            ).group_by(Device.product_id).all()
            
            device_dict = {pid: 0 for pid in product_ids}
            for stat in device_stats:
                device_dict[stat.product_id] = stat.total_devices or 0
            
            # 批量查询最新版本
            version_stats = db.session.query(
                Version.product_id,
                Version.version_num,
                Version.create_time
            ).filter(
                Version.product_id.in_(product_ids),
                Version.publish_status == 1
            ).order_by(Version.create_time.desc()).all()
            
            version_dict = {}
            for v in version_stats:
                if v.product_id not in version_dict:
                    version_dict[v.product_id] = v.version_num
            
            # 为每个产品添加统计信息
            for product in products:
                pid = product.product_id
                stats = license_dict.get(pid, {'total': 0, 'active': 0})
                product._cached_stats = {
                    'total_licenses': stats['total'],
                    'active_licenses': stats['active'],
                    'total_devices': device_dict.get(pid, 0),
                    'latest_version': version_dict.get(pid)
                }
        
        products = [product.to_dict(include_stats=include_stats) for product in products]

        return jsonify({
            'success': True,
            'data': {
                'products': products,
                'pagination': {
                    'page': page,
                    'per_page': per_page,
                    'total': pagination.total,
                    'pages': pagination.pages,
                    'has_prev': pagination.has_prev,
                    'has_next': pagination.has_next
                }
            }
        })

    except Exception as e:
        current_app.logger.error(f"获取产品列表失败: {str(e)}")
        current_app.logger.error(f"错误类型: {type(e)}")
        current_app.logger.error(f"错误堆栈: {traceback.format_exc()}")
        
        return jsonify({
            'success': False,
            'message': '服务器内部错误，请稍后重试'
        }), 500

@api_bp.route('/products', methods=['POST'])
@require_login
def create_product():
    """创建产品"""
    try:
        data = request.get_json()
        if not data:
            return jsonify({
                'success': False,
                'message': '请求数据为空'
            }), 400

        product_name = data.get('product_name', '').strip()
        description = data.get('description', '').strip()
        custom_id = data.get('product_id', '').strip()

        if not product_name:
            return jsonify({
                'success': False,
                'message': '产品名称不能为空'
            }), 400

        # 检查自定义ID是否重复
        if custom_id:
            existing = Product.query.filter_by(product_id=custom_id).first()
            if existing:
                return jsonify({
                    'success': False,
                    'message': '产品ID已存在'
                }), 400

        # 创建产品
        product = Product(
            product_id=custom_id if custom_id else None,
            product_name=product_name,
            description=description,
            status=1
        )

        db.session.add(product)
        db.session.commit()

        # 记录操作日志
        log_operation('CREATE_PRODUCT', 'PRODUCT', product.product_id, {
            'product_name': product.product_name,
            'description': product.description
        })

        return jsonify({
            'success': True,
            'message': '产品创建成功',
            'data': product.to_dict()
        })

    except Exception as e:
        db.session.rollback()
        current_app.logger.error(f"创建产品失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500

@api_bp.route('/products/<product_id>', methods=['GET'])
@require_login
def get_product(product_id):
    """获取产品详情"""
    try:
        product = Product.query.filter_by(product_id=product_id).first()
        if not product:
            return jsonify({
                'success': False,
                'message': '产品不存在'
            }), 404

        return jsonify({
            'success': True,
            'data': product.to_dict(include_stats=True)
        })

    except Exception as e:
        current_app.logger.error(f"获取产品详情失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500

@api_bp.route('/products/<product_id>', methods=['PUT'])
@require_login
def update_product(product_id):
    """更新产品"""
    try:
        product = Product.query.filter_by(product_id=product_id).first()
        if not product:
            return jsonify({
                'success': False,
                'message': '产品不存在'
            }), 404

        data = request.get_json()
        if not data:
            return jsonify({
                'success': False,
                'message': '请求数据为空'
            }), 400

        if 'product_name' in data:
            product.product_name = data['product_name'].strip()
        if 'description' in data:
            product.description = data['description'].strip()
        if 'status' in data:
            product.status = data['status']

        db.session.commit()

        # 记录操作日志
        log_operation('UPDATE_PRODUCT', 'PRODUCT', product.product_id, {
            'product_name': product.product_name,
            'description': product.description
        })

        return jsonify({
            'success': True,
            'message': '产品更新成功',
            'data': product.to_dict()
        })

    except Exception as e:
        db.session.rollback()
        current_app.logger.error(f"更新产品失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500

@api_bp.route('/products/<product_id>', methods=['DELETE'])
@require_login
def delete_product(product_id):
    """删除产品"""
    try:
        product = Product.query.filter_by(product_id=product_id).first()
        if not product:
            return jsonify({
                'success': False,
                'message': '产品不存在'
            }), 404

        # 检查是否有关联的卡密
        license_count = product.licenses.count()
        if license_count > 0:
            return jsonify({
                'success': False,
                'message': f'产品下还有 {license_count} 个卡密，无法删除'
            }), 400

        db.session.delete(product)
        db.session.commit()

        # 记录操作日志
        log_operation('DELETE_PRODUCT', 'PRODUCT', product.product_id, {
            'product_name': product.product_name
        })

        return jsonify({
            'success': True,
            'message': '产品删除成功'
        })

    except Exception as e:
        db.session.rollback()
        current_app.logger.error(f"删除产品失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500


@api_bp.route('/products/batch', methods=['DELETE'])
@require_login
def batch_delete_products():
    """批量删除产品"""
    try:
        data = request.get_json()
        if not data or 'product_ids' not in data:
            return jsonify({
                'success': False,
                'message': '请求数据为空或缺少product_ids字段'
            }), 400

        product_ids = data['product_ids']
        if not isinstance(product_ids, list) or len(product_ids) == 0:
            return jsonify({
                'success': False,
                'message': 'product_ids必须是非空列表'
            }), 400

        # 查找所有要删除的产品
        products = Product.query.filter(Product.product_id.in_(product_ids)).all()
        if len(products) != len(product_ids):
            found_ids = [p.product_id for p in products]
            missing_ids = [pid for pid in product_ids if pid not in found_ids]
            return jsonify({
                'success': False,
                'message': f'以下产品不存在: {", ".join(missing_ids)}'
            }), 404

        # 检查是否有产品有关联的卡密
        undeletable_products = []
        for product in products:
            license_count = product.licenses.count()
            if license_count > 0:
                undeletable_products.append({
                    'product_id': product.product_id,
                    'product_name': product.product_name,
                    'license_count': license_count
                })

        if undeletable_products:
            return jsonify({
                'success': False,
                'message': '部分产品无法删除，因为有关联的卡密',
                'undeletable_products': undeletable_products
            }), 400

        # 批量删除产品
        for product in products:
            db.session.delete(product)
        
        db.session.commit()

        # 记录操作日志
        product_ids = [p.product_id for p in products]
        log_operation('BATCH_DELETE_PRODUCTS', 'PRODUCT', None, {
            'product_ids': product_ids,
            'count': len(products)
        })

        return jsonify({
            'success': True,
            'message': f'成功删除 {len(products)} 个产品'
        })

    except Exception as e:
        db.session.rollback()
        current_app.logger.error(f"批量删除产品失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500


@api_bp.route('/products/batch/status', methods=['PUT'])
@require_login
def batch_update_product_status():
    """批量更新产品状态"""
    try:
        data = request.get_json()
        if not data or 'product_ids' not in data or 'status' not in data:
            return jsonify({
                'success': False,
                'message': '请求数据为空或缺少product_ids/status字段'
            }), 400

        product_ids = data['product_ids']
        status = data['status']
        
        if not isinstance(product_ids, list) or len(product_ids) == 0:
            return jsonify({
                'success': False,
                'message': 'product_ids必须是非空列表'
            }), 400
            
        if status not in [0, 1]:
            return jsonify({
                'success': False,
                'message': 'status必须是0(禁用)或1(启用)'
            }), 400

        # 查找所有要更新的产品
        products = Product.query.filter(Product.product_id.in_(product_ids)).all()
        if len(products) != len(product_ids):
            found_ids = [p.product_id for p in products]
            missing_ids = [pid for pid in product_ids if pid not in found_ids]
            return jsonify({
                'success': False,
                'message': f'以下产品不存在: {", ".join(missing_ids)}'
            }), 404

        # 批量更新产品状态
        for product in products:
            product.status = status
        
        db.session.commit()

        # 记录操作日志
        product_ids = [p.product_id for p in products]
        log_operation('BATCH_UPDATE_PRODUCT_STATUS', 'PRODUCT', None, {
            'product_ids': product_ids,
            'status': status,
            'count': len(products)
        })

        status_name = '启用' if status == 1 else '禁用'
        return jsonify({
            'success': True,
            'message': f'成功{status_name} {len(products)} 个产品'
        })

    except Exception as e:
        db.session.rollback()
        current_app.logger.error(f"批量更新产品状态失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': '服务器内部错误'
        }), 500