#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2025 Any2MIF Project
# All rights reserved.

"""
Any2MIF - 批量队列管理器
负责管理批量转换任务
"""

import os
import threading
import queue
from PyQt6.QtCore import QObject, pyqtSignal

class BatchManager(QObject):
    """批量队列管理器"""
    
    # 自定义信号
    progress_updated = pyqtSignal(int, int, str)  # 进度更新信号 (当前, 总数, 文件名)
    conversion_completed = pyqtSignal(int, int)  # 转换完成信号 (成功数, 失败数)
    
    def __init__(self, converter):
        """
        初始化批量队列管理器
        
        参数:
            converter: MIF转换器实例
        """
        super().__init__()
        self.converter = converter
        self.task_queue = queue.Queue()
        self.is_running = False
        self.worker_thread = None
        self.success_count = 0
        self.fail_count = 0
    
    def start_batch(self, files, output_dir, params, processed_image=None):
        """
        启动批量转换
        
        参数:
            files (list): 文件路径列表
            output_dir (str): 输出目录
            params (dict): 转换参数
            processed_image (PIL.Image, optional): 处理后的图像，如果提供则用于所有图像文件
        """
        # 如果已经在运行，则返回
        if self.is_running:
            return
        
        # 重置计数器
        self.success_count = 0
        self.fail_count = 0
        
        # 清空队列
        while not self.task_queue.empty():
            self.task_queue.get()
        
        # 添加任务到队列
        for file_path in files:
            output_file = os.path.join(
                output_dir,
                f"{os.path.splitext(os.path.basename(file_path))[0]}.mif"
            )
            # 如果有处理后的图像，并且是图像文件，则标记为使用处理后的图像
            use_processed = processed_image is not None and file_path.lower().endswith(('.jpg', '.jpeg', '.png', '.bmp', '.gif', '.tiff'))
            self.task_queue.put((file_path, output_file, params, use_processed, processed_image))
        
        # 设置运行标志
        self.is_running = True
        
        # 创建并启动工作线程
        self.worker_thread = threading.Thread(target=self._worker)
        self.worker_thread.daemon = True
        self.worker_thread.start()
    
    def _worker(self):
        """工作线程函数"""
        total_tasks = self.task_queue.qsize()
        current_task = 0
        
        try:
            while not self.task_queue.empty():
                # 获取任务
                file_path, output_file, params, use_processed, processed_image = self.task_queue.get()
                current_task += 1
                
                # 发出进度更新信号
                self.progress_updated.emit(current_task, total_tasks, os.path.basename(file_path))
                
                try:
                    # 执行转换
                    if use_processed and processed_image:
                        # 使用处理后的图像直接转换
                        success = self.converter.convert_from_image(processed_image, output_file, params)
                    else:
                        # 使用文件路径转换
                        success = self.converter.convert(file_path, output_file, params)
                    
                    # 更新计数器
                    if success:
                        self.success_count += 1
                    else:
                        self.fail_count += 1
                except Exception as e:
                    print(f"转换错误: {str(e)}")
                    self.fail_count += 1
                
                # 标记任务完成
                self.task_queue.task_done()
        finally:
            # 设置运行标志
            self.is_running = False
            
            # 发出转换完成信号
            self.conversion_completed.emit(self.success_count, self.fail_count)
    
    def is_busy(self):
        """
        检查是否正在处理任务
        
        返回:
            bool: 是否正在处理任务
        """
        return self.is_running
    
    def get_progress(self):
        """
        获取当前进度
        
        返回:
            tuple: (当前任务数, 总任务数, 成功数, 失败数)
        """
        total_tasks = self.task_queue.qsize() + self.success_count + self.fail_count
        current_task = self.success_count + self.fail_count
        return (current_task, total_tasks, self.success_count, self.fail_count)
    
    def cancel(self):
        """取消所有任务"""
        # 清空队列
        while not self.task_queue.empty():
            self.task_queue.get()
            self.task_queue.task_done()