#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
多GPU多模态检索系统 - Web应用
专为双GPU部署优化
"""

import os
import json
import time
from flask import Flask, render_template, request, jsonify, send_file, url_for
from werkzeug.utils import secure_filename
from PIL import Image
import base64
import io
import logging
import traceback
import glob

# 设置环境变量优化GPU内存
os.environ['PYTORCH_CUDA_ALLOC_CONF'] = 'expandable_segments:True'

# 配置日志
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

app = Flask(__name__)
app.config['SECRET_KEY'] = 'multigpu_multimodal_retrieval_2024'
app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024  # 16MB max file size

# 配置上传文件夹
UPLOAD_FOLDER = 'uploads'
SAMPLE_IMAGES_FOLDER = 'sample_images'
TEXT_DATA_FOLDER = 'text_data'
ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'bmp', 'webp'}

# 确保文件夹存在
os.makedirs(UPLOAD_FOLDER, exist_ok=True)
os.makedirs(SAMPLE_IMAGES_FOLDER, exist_ok=True)
os.makedirs(TEXT_DATA_FOLDER, exist_ok=True)

# 全局检索系统实例
retrieval_system = None

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

def image_to_base64(image_path):
    """将图片转换为base64编码"""
    try:
        with open(image_path, "rb") as img_file:
            return base64.b64encode(img_file.read()).decode('utf-8')
    except Exception as e:
        logger.error(f"图片转换失败: {e}")
        return None

@app.route('/')
def index():
    """主页"""
    return render_template('index.html')

@app.route('/api/status')
def get_status():
    """获取系统状态"""
    global retrieval_system
    
    status = {
        'initialized': retrieval_system is not None,
        'gpu_count': 0,
        'model_loaded': False
    }
    
    try:
        import torch
        if torch.cuda.is_available():
            status['gpu_count'] = torch.cuda.device_count()
            
        if retrieval_system and retrieval_system.model:
            status['model_loaded'] = True
            status['device_ids'] = retrieval_system.device_ids
            
    except Exception as e:
        logger.error(f"获取状态失败: {e}")
    
    return jsonify(status)

@app.route('/api/init', methods=['POST'])
def initialize_system():
    """初始化多GPU检索系统"""
    global retrieval_system
    
    try:
        logger.info("正在初始化多GPU检索系统...")
        
        # 导入多GPU检索系统
        from multimodal_retrieval_multigpu import MultiGPUMultimodalRetrieval
        
        # 初始化系统
        retrieval_system = MultiGPUMultimodalRetrieval()
        
        if retrieval_system.model is None:
            raise Exception("模型加载失败")
        
        logger.info("✅ 多GPU系统初始化成功")
        
        return jsonify({
            'success': True,
            'message': '多GPU系统初始化成功',
            'device_ids': retrieval_system.device_ids,
            'gpu_count': len(retrieval_system.device_ids)
        })
        
    except Exception as e:
        error_msg = f"系统初始化失败: {str(e)}"
        logger.error(error_msg)
        logger.error(traceback.format_exc())
        
        return jsonify({
            'success': False,
            'message': error_msg
        }), 500

@app.route('/api/search/text_to_text', methods=['POST'])
def search_text_to_text():
    """文本搜索文本"""
    return handle_search('text_to_text')

@app.route('/api/search/text_to_image', methods=['POST'])
def search_text_to_image():
    """文本搜索图片"""
    return handle_search('text_to_image')

@app.route('/api/search/image_to_text', methods=['POST'])
def search_image_to_text():
    """图片搜索文本"""
    return handle_search('image_to_text')

@app.route('/api/search/image_to_image', methods=['POST'])
def search_image_to_image():
    """图片搜索图片"""
    return handle_search('image_to_image')

@app.route('/api/search', methods=['POST'])
def search():
    """通用搜索接口（兼容旧版本）"""
    mode = request.form.get('mode') or request.json.get('mode', 'text_to_text')
    return handle_search(mode)

def handle_search(mode):
    """处理搜索请求的通用函数"""
    global retrieval_system
    
    if not retrieval_system:
        return jsonify({
            'success': False,
            'message': '系统未初始化，请先点击初始化按钮'
        }), 400
    
    try:
        top_k = int(request.form.get('top_k', 5))
        
        if mode in ['text_to_text', 'text_to_image']:
            # 文本查询
            query = request.form.get('query') or request.json.get('query', '')
            if not query.strip():
                return jsonify({
                    'success': False,
                    'message': '请输入查询文本'
                }), 400
            
            logger.info(f"执行{mode}搜索: {query}")
            
            # 执行搜索
            if mode == 'text_to_text':
                raw_results = retrieval_system.search_text_to_text(query, top_k=top_k)
                # 格式化文本搜索结果
                results = []
                for text, score in raw_results:
                    results.append({
                        'text': text,
                        'score': float(score)
                    })
            else:  # text_to_image
                raw_results = retrieval_system.search_text_to_image(query, top_k=top_k)
                # 格式化图像搜索结果
                results = []
                for image_path, score in raw_results:
                    try:
                        # 读取图像并转换为base64
                        with open(image_path, 'rb') as img_file:
                            image_data = img_file.read()
                            image_base64 = base64.b64encode(image_data).decode('utf-8')
                        
                        results.append({
                            'filename': os.path.basename(image_path),
                            'image_path': image_path,
                            'image_base64': image_base64,
                            'score': float(score)
                        })
                    except Exception as e:
                        logger.error(f"读取图像失败 {image_path}: {e}")
                        results.append({
                            'filename': os.path.basename(image_path),
                            'image_path': image_path,
                            'image_base64': '',
                            'score': float(score)
                        })
            
            return jsonify({
                'success': True,
                'mode': mode,
                'query': query,
                'results': results,
                'result_count': len(results)
            })
            
        elif mode in ['image_to_text', 'image_to_image']:
            # 图片查询
            if 'image' not in request.files:
                return jsonify({
                    'success': False,
                    'message': '请上传查询图片'
                }), 400
            
            file = request.files['image']
            if file.filename == '' or not allowed_file(file.filename):
                return jsonify({
                    'success': False,
                    'message': '请上传有效的图片文件'
                }), 400
            
            # 保存上传的图片
            filename = secure_filename(file.filename)
            timestamp = str(int(time.time()))
            filename = f"query_{timestamp}_{filename}"
            filepath = os.path.join(UPLOAD_FOLDER, filename)
            file.save(filepath)
            
            logger.info(f"执行{mode}搜索，图片: {filename}")
            
            # 执行搜索
            if mode == 'image_to_text':
                raw_results = retrieval_system.search_image_to_text(filepath, top_k=top_k)
                # 格式化文本搜索结果
                results = []
                for text, score in raw_results:
                    results.append({
                        'text': text,
                        'score': float(score)
                    })
            else:  # image_to_image
                raw_results = retrieval_system.search_image_to_image(filepath, top_k=top_k)
                # 格式化图像搜索结果
                results = []
                for image_path, score in raw_results:
                    try:
                        # 读取图像并转换为base64
                        with open(image_path, 'rb') as img_file:
                            image_data = img_file.read()
                            image_base64 = base64.b64encode(image_data).decode('utf-8')
                        
                        results.append({
                            'filename': os.path.basename(image_path),
                            'image_path': image_path,
                            'image_base64': image_base64,
                            'score': float(score)
                        })
                    except Exception as e:
                        logger.error(f"读取图像失败 {image_path}: {e}")
                        results.append({
                            'filename': os.path.basename(image_path),
                            'image_path': image_path,
                            'image_base64': '',
                            'score': float(score)
                        })
            
            # 转换查询图片为base64
            query_image_b64 = image_to_base64(filepath)
            
            return jsonify({
                'success': True,
                'mode': mode,
                'query_image': query_image_b64,
                'results': results,
                'result_count': len(results)
            })
        
        else:
            return jsonify({
                'success': False,
                'message': f'不支持的搜索模式: {mode}'
            }), 400
            
    except Exception as e:
        error_msg = f"搜索失败: {str(e)}"
        logger.error(error_msg)
        logger.error(traceback.format_exc())
        
        return jsonify({
            'success': False,
            'message': error_msg
        }), 500

@app.route('/api/upload/images', methods=['POST'])
def upload_images():
    """批量上传图片"""
    try:
        uploaded_files = []
        
        if 'images' not in request.files:
            return jsonify({'success': False, 'message': '没有选择文件'}), 400
        
        files = request.files.getlist('images')
        
        for file in files:
            if file and file.filename != '' and allowed_file(file.filename):
                filename = secure_filename(file.filename)
                timestamp = str(int(time.time()))
                filename = f"{timestamp}_{filename}"
                filepath = os.path.join(SAMPLE_IMAGES_FOLDER, filename)
                file.save(filepath)
                uploaded_files.append(filename)
        
        return jsonify({
            'success': True,
            'message': f'成功上传 {len(uploaded_files)} 个图片文件',
            'uploaded_count': len(uploaded_files),
            'files': uploaded_files
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'message': f'上传失败: {str(e)}'
        }), 500

@app.route('/api/upload/texts', methods=['POST'])
def upload_texts():
    """批量上传文本数据"""
    try:
        data = request.get_json()
        
        if not data or 'texts' not in data:
            return jsonify({'success': False, 'message': '没有提供文本数据'}), 400
        
        texts = data['texts']
        if not isinstance(texts, list):
            return jsonify({'success': False, 'message': '文本数据格式错误'}), 400
        
        # 保存文本数据到文件
        timestamp = str(int(time.time()))
        filename = f"texts_{timestamp}.json"
        filepath = os.path.join(TEXT_DATA_FOLDER, filename)
        
        with open(filepath, 'w', encoding='utf-8') as f:
            json.dump(texts, f, ensure_ascii=False, indent=2)
        
        return jsonify({
            'success': True,
            'message': f'成功上传 {len(texts)} 条文本',
            'uploaded_count': len(texts)
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'message': f'上传失败: {str(e)}'
        }), 500

@app.route('/api/upload/file', methods=['POST'])
def upload_single_file():
    """上传单个文件"""
    if 'file' not in request.files:
        return jsonify({'success': False, 'message': '没有选择文件'}), 400
    
    file = request.files['file']
    if file.filename == '':
        return jsonify({'success': False, 'message': '没有选择文件'}), 400
    
    if file and allowed_file(file.filename):
        filename = secure_filename(file.filename)
        timestamp = str(int(time.time()))
        filename = f"{timestamp}_{filename}"
        filepath = os.path.join(SAMPLE_IMAGES_FOLDER, filename)
        file.save(filepath)
        
        return jsonify({
            'success': True,
            'message': '文件上传成功',
            'filename': filename
        })
    
    return jsonify({'success': False, 'message': '不支持的文件类型'}), 400

@app.route('/api/data/list', methods=['GET'])
def list_data():
    """列出已上传的数据"""
    try:
        # 列出图片文件
        images = []
        if os.path.exists(SAMPLE_IMAGES_FOLDER):
            for filename in os.listdir(SAMPLE_IMAGES_FOLDER):
                if allowed_file(filename):
                    filepath = os.path.join(SAMPLE_IMAGES_FOLDER, filename)
                    stat = os.stat(filepath)
                    images.append({
                        'filename': filename,
                        'size': stat.st_size,
                        'modified': stat.st_mtime
                    })
        
        # 列出文本文件
        texts = []
        if os.path.exists(TEXT_DATA_FOLDER):
            for filename in os.listdir(TEXT_DATA_FOLDER):
                if filename.endswith('.json'):
                    filepath = os.path.join(TEXT_DATA_FOLDER, filename)
                    stat = os.stat(filepath)
                    texts.append({
                        'filename': filename,
                        'size': stat.st_size,
                        'modified': stat.st_mtime
                    })
        
        return jsonify({
            'success': True,
            'data': {
                'images': images,
                'texts': texts
            }
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'message': f'获取数据列表失败: {str(e)}'
        }), 500

@app.route('/api/gpu_status')
def gpu_status():
    """获取GPU状态"""
    try:
        from smart_gpu_launcher import get_gpu_memory_info
        gpu_info = get_gpu_memory_info()
        
        return jsonify({
            'success': True,
            'gpu_info': gpu_info
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'message': f"获取GPU状态失败: {str(e)}"
        }), 500

@app.route('/api/build_index', methods=['POST'])
def build_index():
    """构建检索索引"""
    global retrieval_system
    
    if not retrieval_system:
        return jsonify({
            'success': False,
            'message': '系统未初始化'
        }), 400
    
    try:
        # 获取所有图片和文本文件
        image_files = []
        text_data = []
        
        # 扫描图片文件
        for ext in ALLOWED_EXTENSIONS:
            pattern = os.path.join(SAMPLE_IMAGES_FOLDER, f"*.{ext}")
            image_files.extend(glob.glob(pattern))
        
        # 读取文本文件（支持.json和.txt格式）
        text_files = glob.glob(os.path.join(TEXT_DATA_FOLDER, "*.json"))
        text_files.extend(glob.glob(os.path.join(TEXT_DATA_FOLDER, "*.txt")))
        
        for text_file in text_files:
            try:
                if text_file.endswith('.json'):
                    # 读取JSON格式的文本数据
                    with open(text_file, 'r', encoding='utf-8') as f:
                        data = json.load(f)
                        if isinstance(data, list):
                            text_data.extend([str(item).strip() for item in data if str(item).strip()])
                        else:
                            text_data.append(str(data).strip())
                else:
                    # 读取TXT格式的文本数据
                    with open(text_file, 'r', encoding='utf-8') as f:
                        lines = [line.strip() for line in f.readlines() if line.strip()]
                        text_data.extend(lines)
            except Exception as e:
                logger.warning(f"读取文本文件失败 {text_file}: {e}")
        
        # 检查是否有数据可以构建索引
        if not image_files and not text_data:
            return jsonify({
                'success': False,
                'message': '没有找到可用的图片或文本数据，请先上传数据'
            }), 400
        
        # 构建索引
        if image_files:
            logger.info(f"构建图片索引，共 {len(image_files)} 张图片")
            retrieval_system.build_image_index_parallel(image_files)
        
        if text_data:
            logger.info(f"构建文本索引，共 {len(text_data)} 条文本")
            retrieval_system.build_text_index_parallel(text_data)
        
        return jsonify({
            'success': True,
            'message': f'索引构建完成！图片: {len(image_files)} 张，文本: {len(text_data)} 条',
            'image_count': len(image_files),
            'text_count': len(text_data)
        })
        
    except Exception as e:
        logger.error(f"构建索引失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': f'构建索引失败: {str(e)}'
        }), 500

@app.route('/api/data/stats', methods=['GET'])
def get_data_stats():
    """获取数据统计信息"""
    try:
        # 统计图片文件
        image_count = 0
        for ext in ALLOWED_EXTENSIONS:
            pattern = os.path.join(SAMPLE_IMAGES_FOLDER, f"*.{ext}")
            image_count += len(glob.glob(pattern))
        
        # 统计文本数据
        text_count = 0
        text_files = glob.glob(os.path.join(TEXT_DATA_FOLDER, "*.txt"))
        for text_file in text_files:
            try:
                with open(text_file, 'r', encoding='utf-8') as f:
                    lines = [line.strip() for line in f.readlines() if line.strip()]
                    text_count += len(lines)
            except Exception:
                continue
        
        return jsonify({
            'success': True,
            'image_count': image_count,
            'text_count': text_count
        })
        
    except Exception as e:
        logger.error(f"获取数据统计失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': f'获取统计失败: {str(e)}'
        }), 500

@app.route('/api/data/clear', methods=['POST'])
def clear_data():
    """清空所有数据"""
    try:
        # 清空图片文件
        for ext in ALLOWED_EXTENSIONS:
            pattern = os.path.join(SAMPLE_IMAGES_FOLDER, f"*.{ext}")
            for file_path in glob.glob(pattern):
                try:
                    os.remove(file_path)
                except Exception as e:
                    logger.warning(f"删除图片文件失败 {file_path}: {e}")
        
        # 清空文本文件
        text_files = glob.glob(os.path.join(TEXT_DATA_FOLDER, "*.txt"))
        for text_file in text_files:
            try:
                os.remove(text_file)
            except Exception as e:
                logger.warning(f"删除文本文件失败 {text_file}: {e}")
        
        # 重置索引
        global retrieval_system
        if retrieval_system:
            retrieval_system.text_index = None
            retrieval_system.image_index = None
            retrieval_system.text_data = []
            retrieval_system.image_data = []
        
        return jsonify({
            'success': True,
            'message': '数据已清空'
        })
        
    except Exception as e:
        logger.error(f"清空数据失败: {str(e)}")
        return jsonify({
            'success': False,
            'message': f'清空数据失败: {str(e)}'
        }), 500

@app.route('/uploads/<filename>')
def uploaded_file(filename):
    """提供上传文件的访问"""
    return send_file(os.path.join(SAMPLE_IMAGES_FOLDER, filename))

def print_startup_info():
    """打印启动信息"""
    print("🚀 启动多GPU多模态检索Web应用")
    print("=" * 60)
    print("访问地址: http://localhost:5000")
    print("支持功能:")
    print("  📝 文搜文 - 文本查找相似文本")
    print("  🖼️ 文搜图 - 文本查找相关图片") 
    print("  📝 图搜文 - 图片查找相关文本")
    print("  🖼️ 图搜图 - 图片查找相似图片")
    print("  📤 批量上传 - 图片和文本数据管理")
    print("GPU配置:")
    
    try:
        import torch
        if torch.cuda.is_available():
            gpu_count = torch.cuda.device_count()
            print(f"  🖥️ 检测到 {gpu_count} 个GPU")
            for i in range(gpu_count):
                name = torch.cuda.get_device_name(i)
                props = torch.cuda.get_device_properties(i)
                memory_gb = props.total_memory / 1024**3
                print(f"  GPU {i}: {name} ({memory_gb:.1f}GB)")
        else:
            print("  ❌ CUDA不可用")
    except Exception as e:
        print(f"  ❌ GPU检查失败: {e}")
    
    print("=" * 60)

def auto_initialize():
    """启动时自动初始化系统"""
    global retrieval_system
    
    try:
        logger.info("🚀 启动时自动初始化多GPU检索系统...")
        
        # 导入多GPU检索系统
        from multimodal_retrieval_multigpu import MultiGPUMultimodalRetrieval
        
        # 初始化系统
        retrieval_system = MultiGPUMultimodalRetrieval()
        
        if retrieval_system.model is None:
            raise Exception("模型加载失败")
        
        logger.info("✅ 系统自动初始化成功")
        return True
        
    except Exception as e:
        logger.error(f"❌ 系统自动初始化失败: {str(e)}")
        logger.error(traceback.format_exc())
        return False

if __name__ == '__main__':
    print_startup_info()
    
    # 启动时自动初始化
    auto_initialize()
    
    # 启动Flask应用
    app.run(
        host='0.0.0.0',
        port=5000,
        debug=False,
        threaded=True
    )