#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
sscp - 简化从L3到L0的文件传输工具
用法: sscp <源文件/目录> [<源文件/目录>...] <目标路径>
"""

import os
import sys
import json
import argparse
import subprocess
import re
import shutil
from pathlib import Path

def parse_arguments():
    """解析命令行参数"""
    parser = argparse.ArgumentParser(description='从L3向L0传输文件的简化工具')
    parser.add_argument('sources', nargs='+', help='源文件或目录路径')
    parser.add_argument('target', help='目标路径')
    parser.add_argument('-v', '--verbose', action='store_true', help='显示详细信息')
    parser.add_argument('-r', '--recursive', action='store_true', help='递归处理目录')
    return parser.parse_args()

def get_mount_points():
    """从配置文件获取挂载点信息"""
    config_path = Path.home() / ".config" / "sscp" / "config.json"
    
    if not config_path.exists():
        print(f"警告: 找不到配置文件 {config_path}，将使用默认挂载点 ~/mnt")
        return {str(Path.home() / "mnt"): "/l0"}
    
    with open(config_path, 'r') as f:
        config = json.load(f)
    
    # 从配置中提取挂载点信息
    mount_points = []
    mount_points = config['mounts'].copy()
    return mount_points
def encode_path(path):
    """
    对L0路径进行编码
    将 /l0x/path/to/file 编码为 l0x@path@to@file
    同时处理路径中已有的@符号
    """
    # 先将已有的@符号替换为特殊序列
    path_escaped = path.replace('@', '@@')
    
    # 将路径中的斜杠替换为@符号
    encoded_path = path_escaped.replace('/', '@')
    
    # 确保路径以l0开头
    if not encoded_path.startswith('@l0'):
        raise ValueError(f"无法识别的L0路径格式: {path}")
    
    # 移除开头的@
    return encoded_path[1:]

def create_symlink(source_path, encoded_path):
    """创建源文件或目录到临时位置的软链接"""
    temp_dir = Path("/tmp/sscp")
    temp_dir.mkdir(exist_ok=True)
    
    temp_link = temp_dir / encoded_path
    # 确保父目录存在
    temp_link.parent.mkdir(parents=True, exist_ok=True)
    
    # 如果已存在，先删除
    if temp_link.exists():
        if temp_link.is_dir() and not temp_link.is_symlink():
            shutil.rmtree(temp_link)
        else:
            temp_link.unlink()
    
    # 创建软链接
    os.symlink(os.path.abspath(source_path), temp_link)
    return temp_link

def call_ssbuild(encoded_path, verbose=False):
    """调用ssbuild工具发送文件或目录"""
    try:
        cmd = ["ssbuild", str(encoded_path)]
        if verbose:
            print(f"执行命令: {' '.join(cmd)}")
        
        result = subprocess.run(
            cmd, 
            check=True, 
            capture_output=True, 
            text=True
        )
        return result.stdout
    except subprocess.CalledProcessError as e:
        print(f"调用ssbuild失败: {e}")
        print(f"错误输出: {e.stderr}")
        sys.exit(1)
    except FileNotFoundError:
        print("错误: 找不到ssbuild命令，请确保它已安装并在PATH中")
        sys.exit(1)

def is_mount_path(path, mount_points):
    """检查路径是否在挂载点中"""
    path_str = str(path)
    for mount_point in mount_points:
        if path_str.startswith(mount_point):
            return mount_point
    return None

def process_source(source_path, target_path, mount_points, verbose=False):
    """处理单个源文件或目录"""
    source_path = Path(source_path).resolve()
    target_path = Path(target_path)
    
    # 检查源是否存在
    if not source_path.exists():
        print(f"错误: 源 '{source_path}' 不存在")
        return False
    
    # 如果目标是目录，添加源文件名
    if target_path.is_dir() or (len(mount_points) > 0 and not target_path.suffix):
        final_target = target_path / source_path.name
    else:
        final_target = target_path
    
    # 检查目标路径是否在挂载点中
    mount_point = is_mount_path(final_target, mount_points)
    if not mount_point:
        print(f"错误: 目标路径 '{final_target}' 不在已知的挂载目录中")
        print(f"有效的挂载点: {', '.join(mount_points.keys())}")
        return False
    
    try:
        # 从挂载路径提取L0路径部分
        target_str = str(final_target)
        relative_path = target_str[len(mount_point):]
        
        # 构建完整的L0路径
        l0_path = mount_points[mount_point] + relative_path
        
        # 对L0路径进行编码
        encoded_path = encode_path(l0_path)
        
        if verbose:
            print(f"源路径: {source_path}")
            print(f"目标路径: {final_target}")
            print(f"挂载点: {mount_point}")
            print(f"L0路径: {l0_path}")
            print(f"编码后的路径: {encoded_path}")
        
        # 创建源的软链接
        temp_link = create_symlink(source_path, encoded_path)
        
        if verbose:
            print(f"创建软链接: {source_path} -> {temp_link}")
        
        # 调用ssbuild工具发送文件或目录
        print(f"正在发送: {source_path} -> {final_target}")
        output = call_ssbuild(temp_link, verbose)
        
        if verbose and output:
            print(f"ssbuild输出: {output}")
        
        print(f"已成功传输到 {final_target}")
        return True
        
    except Exception as e:
        print(f"处理 {source_path} 时出错: {e}")
        return False

def main():
    args = parse_arguments()
    
    # 获取挂载点信息
    mount_points = get_mount_points()
    
    if args.verbose:
        print(f"已识别的挂载点: {mount_points}")
    
    # 最后一个参数是目标路径
    target = args.sources.pop()
    sources = args.sources
    
    if not sources:
        print("错误: 至少需要一个源文件或目录")
        sys.exit(1)
    
    # 处理每个源文件或目录
    success_count = 0
    for source in sources:
        if process_source(source, target, mount_points, args.verbose):
            success_count += 1
    
    # 报告结果
    if success_count == len(sources):
        print(f"所有 {len(sources)} 个文件/目录已成功传输")
    else:
        print(f"传输完成: {success_count}/{len(sources)} 个文件/目录成功")
        sys.exit(1)

if __name__ == "__main__":
    main()