import os
from flask import Flask, request, render_template_string, redirect, url_for, jsonify
from werkzeug.utils import secure_filename
from flask_cors import CORS
from clickhouse_client import clickhouse_client
from config import Config
from datetime import datetime


app = Flask(__name__)
CORS(app)  # 允许跨域请求
app.config.from_object(Config)

# 配置
UPLOAD_FOLDER = 'uploads'
ALLOWED_EXTENSIONS = {'txt'}

# 确保上传目录存在
if not os.path.exists(UPLOAD_FOLDER):
    os.makedirs(UPLOAD_FOLDER)

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER

def upload_file():
    message = ''
    filename = ''

    # 检查是否有文件部分
    if 'file' not in request.files:
        message = '没有文件部分'
        return_info = {
            "code": 203,
            "message": message
        }
        return jsonify(return_info)

    file = request.files['file']

    # 如果用户没有选择文件
    if file.filename == '':
        message = '没有选择文件'
        return_info = {
            "code": 203,
            "message": message
        }

        return jsonify(return_info)

    if file and allowed_file(file.filename):
        # 安全处理文件名
        filename = secure_filename(file.filename)

        # 处理同名文件：添加时间戳
        name, ext = os.path.splitext(filename)
        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        filename = f"{name}_{timestamp}{ext}"

        # 保存文件
        filepath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
        file.save(filepath)

        message = '文件上传成功！'
        return_info = {
            "code": 203,
            "message": message
        }

        return jsonify(return_info)
    else:
        message = '文件类型不允许'

def allowed_file(filename):
    """检查文件扩展名是否允许"""
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

# ========== API路由 ==========

@app.route('/')
def index():
    """首页"""
    return jsonify({
        'message': 'ClickHouse Flask API',
        'endpoints': {
            'GET /health': '检查服务健康状态',
            'POST /users/<user_uuid>/records': '创建用户记录',
            'POST /users/<user_uuid>/records/batch': '批量创建记录',
            'GET /users/<user_uuid>/records': '获取用户所有记录',
            'GET /users/<user_uuid>/records/<record_id>': '获取单条记录',
            'PUT /users/<user_uuid>/records/<record_id>': '更新记录',
            'DELETE /users/<user_uuid>/records/<record_id>': '删除单条记录',
            'DELETE /users/<user_uuid>/records': '删除用户所有记录',
            'PUT /users/<user_uuid>/records/<record_id>/restore': '恢复已删除记录',
            'GET /users/<user_uuid>/search': '搜索用户记录',
            'GET /users/<user_uuid>/stats': '获取用户统计信息'
        }
    })


@app.route('/health', methods=['GET'])
def health_check():
    """健康检查"""
    try:
        # 测试ClickHouse连接
        clickhouse_client.client.execute('SELECT 1')
        return jsonify({'status': 'healthy', 'database': 'connected'})
    except Exception as e:
        return jsonify({'status': 'unhealthy', 'error': str(e)}), 500


# ========== 用户记录操作 ==========

@app.route('/users/<user_uuid>/records', methods=['POST'])
def create_record(user_uuid):
    """创建用户记录"""
    try:
        data = request.get_json()
        if not data:
            return jsonify({'error': 'No data provided'}), 400

        file_path = data.get('file_path')
        is_delete = data.get('is_delete', 0)

        if not file_path:
            return jsonify({'error': 'file_path is required'}), 400

        # 调用更新后的方法，返回record_id
        record_id = clickhouse_client.create_user_record(user_uuid, file_path, is_delete)

        if record_id:
            return jsonify({
                'message': 'Record created successfully',
                'user_uuid': user_uuid,
                'record_id': record_id,
                'file_path': file_path
            }), 201
        else:
            return jsonify({'error': 'Failed to create record'}), 500

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/records/batch', methods=['POST'])
def batch_create_records(user_uuid):
    """批量创建用户记录"""
    try:
        data = request.get_json()
        if not data or not isinstance(data, list):
            return jsonify({'error': 'Data must be a list of records'}), 400

        # 为每条记录添加user_uuid
        records = []
        for item in data:
            if not isinstance(item, dict):
                continue

            record = {
                'user_uuid': user_uuid,
                'file_path': item.get('file_path', ''),
                'is_delete': item.get('is_delete', 0)
            }

            if record['file_path']:  # 只添加有文件路径的记录
                records.append(record)

        if not records:
            return jsonify({'error': 'No valid records provided'}), 400

        # 调用更新后的方法，返回record_ids
        record_ids = clickhouse_client.batch_create_records(records)

        if record_ids:
            return jsonify({
                'message': f'{len(record_ids)} records created successfully',
                'user_uuid': user_uuid,
                'record_ids': record_ids,
                'count': len(record_ids)
            }), 201
        else:
            return jsonify({'error': 'Failed to create records'}), 500

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/records', methods=['GET'])
def get_records(user_uuid):
    """获取用户的所有记录"""
    try:
        include_deleted = request.args.get('include_deleted', 'false').lower() == 'true'

        records = clickhouse_client.get_user_records(user_uuid, include_deleted)

        return jsonify({
            'user_uuid': user_uuid,
            'count': len(records),
            'records': records
        })

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/records/<record_id>', methods=['GET'])
def get_single_record(user_uuid, record_id):
    """获取单条记录"""
    try:
        record = clickhouse_client.get_user_record_by_id(record_id)

        if not record:
            return jsonify({'error': 'Record not found'}), 404

        if record['user_uuid'] != user_uuid:
            return jsonify({'error': 'Record does not belong to this user'}), 403

        return jsonify(record)

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/records/<record_id>', methods=['PUT'])
def update_record(user_uuid, record_id):
    """更新记录"""
    try:
        # 先检查记录是否存在且属于该用户
        record = clickhouse_client.get_user_record_by_id(record_id)
        if not record:
            return jsonify({'error': 'Record not found'}), 404

        if record['user_uuid'] != user_uuid:
            return jsonify({'error': 'Record does not belong to this user'}), 403

        data = request.get_json()
        if not data:
            return jsonify({'error': 'No data provided'}), 400

        file_path = data.get('file_path')
        is_delete = data.get('is_delete')

        success = clickhouse_client.update_user_record(record_id, file_path, is_delete)

        if success:
            return jsonify({
                'message': 'Record updated successfully',
                'record_id': record_id,
                'user_uuid': user_uuid
            })
        else:
            return jsonify({'error': 'Failed to update record'}), 500

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/records/<record_id>', methods=['DELETE'])
def delete_record(user_uuid, record_id):
    """删除单条记录"""
    try:
        # 先检查记录是否存在且属于该用户
        record = clickhouse_client.get_user_record_by_id(record_id)
        if not record:
            return jsonify({'error': 'Record not found'}), 404

        if record['user_uuid'] != user_uuid:
            return jsonify({'error': 'Record does not belong to this user'}), 403

        # 获取删除类型参数
        soft_delete = request.args.get('soft_delete', 'true').lower() == 'true'

        success = clickhouse_client.delete_user_record(record_id, soft_delete)

        if success:
            action = 'soft deleted' if soft_delete else 'permanently deleted'
            return jsonify({
                'message': f'Record {action} successfully',
                'record_id': record_id,
                'user_uuid': user_uuid
            })
        else:
            return jsonify({'error': 'Failed to delete record'}), 500

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/records', methods=['DELETE'])
def delete_all_records(user_uuid):
    """删除用户的所有记录"""
    try:
        # 获取删除类型参数
        soft_delete = request.args.get('soft_delete', 'true').lower() == 'true'

        success = clickhouse_client.delete_all_user_records(user_uuid, soft_delete)

        if success:
            action = 'soft deleted' if soft_delete else 'permanently deleted'
            return jsonify({
                'message': f'All records for user {user_uuid} have been {action}',
                'user_uuid': user_uuid
            })
        else:
            return jsonify({'error': 'Failed to delete records'}), 500

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/records/<record_id>/restore', methods=['PUT'])
def restore_record(user_uuid, record_id):
    """恢复已删除的记录"""
    try:
        # 先检查记录是否存在
        record = clickhouse_client.get_user_record_by_id(record_id)
        if not record:
            return jsonify({'error': 'Record not found'}), 404

        if record['user_uuid'] != user_uuid:
            return jsonify({'error': 'Record does not belong to this user'}), 403

        success = clickhouse_client.restore_user_record(record_id)

        if success:
            return jsonify({
                'message': 'Record restored successfully',
                'record_id': record_id,
                'user_uuid': user_uuid
            })
        else:
            return jsonify({'error': 'Failed to restore record'}), 500

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/search', methods=['GET'])
def search_records(user_uuid):
    """搜索用户记录"""
    try:
        keyword = request.args.get('keyword')
        is_delete_param = request.args.get('is_delete')

        is_delete = None
        if is_delete_param is not None:
            is_delete = int(is_delete_param)

        records = clickhouse_client.search_user_records(user_uuid, keyword, is_delete)

        return jsonify({
            'user_uuid': user_uuid,
            'count': len(records),
            'records': records
        })

    except Exception as e:
        return jsonify({'error': str(e)}), 500


@app.route('/users/<user_uuid>/stats', methods=['GET'])
def get_user_stats(user_uuid):
    """获取用户统计信息"""
    try:
        stats = clickhouse_client.get_user_stats(user_uuid)

        if stats:
            return jsonify({
                'user_uuid': user_uuid,
                'stats': stats
            })
        else:
            return jsonify({
                'user_uuid': user_uuid,
                'stats': {
                    'total_count': 0,
                    'active_count': 0,
                    'deleted_count': 0,
                    'first_created': None,
                    'last_created': None
                }
            })

    except Exception as e:
        return jsonify({'error': str(e)}), 500


# ========== 错误处理 ==========

@app.errorhandler(404)
def not_found(error):
    return jsonify({'error': 'Not found'}), 404


@app.errorhandler(500)
def internal_error(error):
    return jsonify({'error': 'Internal server error'}), 500


# ========== 主程序 ==========

if __name__ == '__main__':
    # 创建上传目录（如果需要）
    os.makedirs('uploads', exist_ok=True)

    # 启动Flask应用
    app.run(
        host='0.0.0.0',
        port=28002,
        debug=Config.DEBUG
    )