# -*- coding: utf-8 -*-
"""
RAG 知识库服务 - Flask API
支持与 jar 包同级目录部署
"""
import os
import sys
from flask import Flask, request, jsonify
from flask_cors import CORS
from config import HOST, PORT, KNOWLEDGE_DIR, BASE_DIR
from knowledge_service import knowledge_service
from file_watcher import FileWatcher

app = Flask(__name__)
CORS(app)  # 允许跨域请求

# 文件监控器
file_watcher = None

@app.route('/api/health', methods=['GET'])
def health_check():
    """健康检查"""
    return jsonify({
        'status': 'ok',
        'service': 'RAG Knowledge Service',
        'knowledge_dir': KNOWLEDGE_DIR,
        'base_dir': BASE_DIR
    })

@app.route('/api/documents', methods=['GET'])
def list_documents():
    """列出所有文档"""
    try:
        documents = knowledge_service.list_documents()
        return jsonify({
            'success': True,
            'data': documents
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)}), 500

@app.route('/api/documents/upload', methods=['POST'])
def upload_document():
    """上传文档"""
    try:
        if 'file' not in request.files:
            return jsonify({'success': False, 'error': '没有上传文件'}), 400
        
        file = request.files['file']
        if file.filename == '':
            return jsonify({'success': False, 'error': '文件名为空'}), 400
        
        result = knowledge_service.upload_and_index(file)
        
        if result['success']:
            return jsonify({
                'success': True,
                'data': result
            })
        else:
            return jsonify({'success': False, 'error': result.get('error')}), 400
    
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)}), 500

@app.route('/api/documents/<filename>', methods=['DELETE'])
def delete_document(filename):
    """删除文档"""
    try:
        result = knowledge_service.delete_document(filename)
        return jsonify({
            'success': result['success'],
            'data': result
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)}), 500

@app.route('/api/search', methods=['POST'])
def search():
    """搜索文档"""
    try:
        data = request.get_json()
        query = data.get('query', '')
        top_k = data.get('top_k', 5)
        
        if not query:
            return jsonify({'success': False, 'error': '查询内容不能为空'}), 400
        
        results = knowledge_service.search(query, top_k)
        
        return jsonify({
            'success': True,
            'data': results
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)}), 500

@app.route('/api/stats', methods=['GET'])
def get_stats():
    """获取统计信息"""
    try:
        stats = knowledge_service.get_stats()
        return jsonify({
            'success': True,
            'data': stats
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)}), 500

@app.route('/api/rebuild', methods=['POST'])
def rebuild_index():
    """重建索引"""
    try:
        result = knowledge_service.rebuild_index()
        return jsonify({
            'success': True,
            'data': result
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)}), 500

@app.route('/api/scan', methods=['POST'])
def scan_folder():
    """扫描文件夹并索引新文件"""
    try:
        result = knowledge_service.scan_and_index_folder()
        return jsonify({
            'success': True,
            'data': result
        })
    except Exception as e:
        return jsonify({'success': False, 'error': str(e)}), 500

def init_service():
    """初始化服务"""
    print("=" * 50)
    print("RAG 知识库服务启动中...")
    print("=" * 50)
    
    # 初始化知识库服务
    knowledge_service.init()
    
    # 扫描并索引新文件
    knowledge_service.scan_and_index_folder()
    
    # 启动文件监控
    global file_watcher
    file_watcher = FileWatcher(knowledge_service)
    file_watcher.start()
    
    print("=" * 50)
    print(f"服务已启动: http://{HOST}:{PORT}")
    print(f"知识库文件夹: {KNOWLEDGE_DIR}")
    print("=" * 50)

if __name__ == '__main__':
    init_service()
    app.run(host=HOST, port=PORT, debug=False, threaded=True)