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

@api_bp.route('/devices', methods=['GET'])
@require_login
def get_devices():
    """获取设备列表"""
    try:
        page = request.args.get('page', 1, type=int)
        per_page = min(request.args.get('per_page', 20, type=int), 100)
        product_id = request.args.get('product_id')
        software_version = request.args.get('software_version')
        status = request.args.get('status', type=int)
        keyword = request.args.get('keyword', '').strip()
        product = request.args.get('product')
        license_key = request.args.get('license')

        # 使用join预加载Product和License关系，避免N+1查询
        query = db.session.query(Device).join(Product, Device.product_id == Product.product_id).outerjoin(License, Device.license_id == License.license_id)
        
        # 添加搜索条件
        if product_id:
            query = query.filter(Device.product_id == product_id)
        if software_version:
            query = query.filter(Device.software_version == software_version)
        if status is not None:
            query = query.filter(Device.status == status)
        if keyword:
            query = query.filter(
                or_(
                    func.lower(Device.machine_code).like(f'%{keyword.lower()}%'),
                    func.cast(Device.device_id, db.String).like(f'%{keyword}%'),
                    Product.product_name.like(f'%{keyword}%')
                )
            )
        if product:
            query = query.filter(
                or_(
                    db.cast(Product.product_id, db.String).like(f'%{product}%'),
                    Product.product_name.like(f'%{product}%')
                )
            )
        if license_key and license_key.strip():
            query = query.filter(db.cast(License.license_key, db.String).like(f'%{license_key}%'))

        query = query.order_by(db.desc(Device.last_verify_time))
        pagination = query.paginate(page=page, per_page=per_page, error_out=False)

        devices = [device.to_dict() for device in pagination.items]

        return jsonify({
            'success': True,
            'data': {
                'devices': devices,
                '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"获取设备列表失败: {str(e)}")
        return jsonify({'success': False, 'message': '服务器内部错误'}), 500

@api_bp.route('/devices/<int:device_id>/status', methods=['PUT'])
@require_login
def update_device_status(device_id):
    """更新设备状态"""
    try:
        device = Device.query.get(device_id)
        if not device:
            return jsonify({'success': False, 'message': '设备不存在'}), 404

        data = request.get_json()
        status = data.get('status')
        
        if status is None:
            return jsonify({'success': False, 'message': '状态参数不能为空'}), 400
            
        if status not in [0, 1, 2]:
            return jsonify({'success': False, 'message': '无效的状态值'}), 400

        device.status = status
        db.session.commit()

        # 记录操作日志
        log_operation('UPDATE_DEVICE_STATUS', 'DEVICE', device.device_id, {
            'status': status
        })

        return jsonify({
            'success': True,
            'message': '设备状态更新成功',
            'data': device.to_dict()
        })

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

@api_bp.route('/devices/<int:device_id>', methods=['DELETE'])
@require_login
def delete_device(device_id):
    """删除设备"""
    try:
        device = Device.query.get(device_id)
        if not device:
            return jsonify({'success': False, 'message': '设备不存在'}), 404

        db.session.delete(device)
        db.session.commit()

        # 记录操作日志
        log_operation('DELETE_DEVICE', 'DEVICE', device.device_id, {
            'machine_code': device.machine_code
        })

        return jsonify({
            'success': True,
            'message': '设备删除成功'
        })

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


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

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

        # 查找所有要删除的设备
        devices = Device.query.filter(Device.device_id.in_(device_ids)).all()
        if len(devices) != len(device_ids):
            found_ids = [d.device_id for d in devices]
            missing_ids = [did for did in device_ids if did not in found_ids]
            return jsonify({
                'success': False,
                'message': f'以下设备不存在: {", ".join(map(str, missing_ids))}'
            }), 404

        # 批量删除设备
        for device in devices:
            db.session.delete(device)
        
        db.session.commit()

        # 记录操作日志
        device_ids = [device.device_id for device in devices]
        log_operation('BATCH_DELETE_DEVICES', 'DEVICE', None, {
            'device_ids': device_ids,
            'count': len(devices)
        })

        return jsonify({
            'success': True,
            'message': f'成功删除 {len(devices)} 个设备'
        })

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


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

        device_ids = data['device_ids']
        status = data['status']
        
        if not isinstance(device_ids, list) or len(device_ids) == 0:
            return jsonify({
                'success': False,
                'message': 'device_ids必须是非空列表'
            }), 400
            
        if status not in [0, 1, 2]:
            return jsonify({
                'success': False,
                'message': 'status必须是0(禁用)、1(正常)或2(离线)'
            }), 400

        # 查找所有要更新的设备
        devices = Device.query.filter(Device.device_id.in_(device_ids)).all()
        if len(devices) != len(device_ids):
            found_ids = [d.device_id for d in devices]
            missing_ids = [did for did in device_ids if did not in found_ids]
            return jsonify({
                'success': False,
                'message': f'以下设备不存在: {", ".join(map(str, missing_ids))}'
            }), 404

        # 批量更新设备状态
        for device in devices:
            device.status = status
        
        db.session.commit()

        # 记录操作日志
        device_ids = [device.device_id for device in devices]
        log_operation('BATCH_UPDATE_DEVICE_STATUS', 'DEVICE', None, {
            'device_ids': device_ids,
            'status': status,
            'count': len(devices)
        })

        status_names = {0: '禁用', 1: '正常', 2: '离线'}
        status_name = status_names.get(status, '未知')
        return jsonify({
            'success': True,
            'message': f'成功将 {len(devices)} 个设备状态更新为{status_name}'
        })

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