from flask import Flask, request, jsonify
import os
from image_search import ImageSearchEngine
import time
import config

app = Flask(__name__)

os.makedirs(config.UPLOAD_FOLDER, exist_ok=True)

# 初始化图像搜索引擎
search_engine = ImageSearchEngine()

def allowed_file(filename):
    """检查文件是否允许上传"""
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in config.ALLOWED_EXTENSIONS

@app.route('/add', methods=['POST'])
def add_image_file():
    """处理图片上传请求"""
    try:
        # 获取并验证参数
        data = request.get_json()
        if not data:
            return jsonify({'error': '请求必须包含JSON数据'}), 400
        
        product_id = data.get('imageId')
        image_url = data.get('url')
        
        if not product_id:
            return jsonify({'error': '缺少product_id参数'}), 400
        if not image_url:
            return jsonify({'error': '缺少url参数'}), 400
        
        if not isinstance(image_url, str) or not (image_url.startswith('http://') or image_url.startswith('https://')):
            return jsonify({'error': '无效的图片URL'}), 400
    
        # 添加图片到搜索引擎
        if search_engine.add_image_from_url(image_url, product_id):
            return jsonify({'message': '上传成功', 'product_id': product_id})
        else:
            return jsonify({'error': '处理图片失败'}), 500
       
            
    except Exception as e:
        return jsonify({'error': str(e)}), 500
    
@app.route('/search', methods=['POST'])
def search():
    """处理图片搜索请求"""
    try:
        # 获取并验证参数
        data = request.get_json()
        if not data:
            return jsonify({'error': '请求必须包含JSON数据'}), 400
        image_url = data.get('url')
        if not image_url:
            return jsonify({'error': '缺少url参数'}), 400
        if not isinstance(image_url, str) or not (image_url.startswith('http://') or image_url.startswith('https://')):
            return jsonify({'error': '无效的图片URL'}), 400
            
        print(f"search payload, type:{type(data)}, data: {data}")
        # 获取可选参数
        limit = data.get('limit', config.TOP_K)
        min_score = data.get('min_score', config.MIN_SCORE)
        max_score = data.get('max_score', config.MAX_SCORE)
        
        # 验证参数类型和范围
        try:
            limit = int(limit)
            min_score = float(min_score)
            max_score = float(max_score)
            
            if limit <= 0:
                return jsonify({'error': 'limit必须大于0'}), 400
            if min_score < 0 or min_score > 1.0:
                return jsonify({'error': 'min_score必须在0到1之间'}), 400
            if max_score < 0 or max_score > 1.0:
                return jsonify({'error': 'max_score必须在0到1之间'}), 400
            if min_score > max_score:
                return jsonify({'error': 'min_score不能大于max_score'}), 400
        except ValueError:
            return jsonify({'error': '参数类型错误'}), 400
        print(f"search apply limit:{limit} min_score:{min_score} max_score:{max_score}")

        start_search_time = time.time()

        results = search_engine.search(image_url, top_k=limit)
        # 格式化结果并过滤不在分数范围内的结果
        formatted_results = []
        for product_id, score in results:
            similarity = score  # 转换为百分比
            if min_score <= similarity <= max_score:
                formatted_results.append({
                    'Id': product_id,
                    'Score': similarity
                })
        end_search_time = time.time()
        print(f"搜索耗时: { end_search_time - start_search_time } s",)

        return jsonify(formatted_results), 200
    

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

@app.route('/remove/<product_id>', methods=['POST'])
def remove_image(product_id):
    """移除指定商品ID的图片特征"""
    try:
        # 从索引中移除
        if search_engine.remove_by_product_id(product_id):
            return jsonify({'message': '删除成功', 'product_id': product_id})
        else:
            return jsonify({'error': '商品ID不存在或删除失败'}), 404
            
    except Exception as e:
        return jsonify({'error': str(e)}), 500

@app.route('/clear/<password>', methods=['POST'])
def clear_index(password):
    """清空索引"""
    if password == "infish@2025":
        try:
            search_engine.clear()
        except Exception as e:
            return jsonify({'error': str(e)}), 500

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=False)