#!/usr/bin/env python3
"""
导入更新脚本

此脚本帮助识别和更新旧模块的导入引用。
"""

import os
import re
from pathlib import Path
from typing import List, Tuple

# 导入映射：旧模块 -> 新模块
IMPORT_MAPPINGS = {
    # 向量搜索相关
    'src.api.sdk.search_infinity': 'src.application.vector_search.handlers',
    'src.api.db.services.vector_search_service': 'src.infrastructure.vector_db',
    
    # 数据库相关
    'src.api.db.repositories': 'src.infrastructure.database.repositories',
    'src.api.db.models': 'src.presentation.schemas',
    
    # 文档解析相关
    'src.api.dataset': 'src.application.document_parsing',
    
    # 其他
    'src.api.sdk': 'src.application',
}


def find_python_files(root_dir: str, exclude_dirs: List[str] = None) -> List[Path]:
    """
    查找所有 Python 文件
    
    Args:
        root_dir: 根目录
        exclude_dirs: 要排除的目录列表
    
    Returns:
        Python 文件路径列表
    """
    if exclude_dirs is None:
        exclude_dirs = ['.git', '__pycache__', '.pytest_cache', 'venv', '.venv', 'node_modules']
    
    python_files = []
    root_path = Path(root_dir)
    
    for file_path in root_path.rglob('*.py'):
        # 检查是否在排除目录中
        if any(excluded in file_path.parts for excluded in exclude_dirs):
            continue
        python_files.append(file_path)
    
    return python_files


def find_old_imports(file_path: Path) -> List[Tuple[int, str, str]]:
    """
    在文件中查找旧的导入语句
    
    Args:
        file_path: 文件路径
    
    Returns:
        (行号, 旧导入, 建议的新导入) 的列表
    """
    old_imports = []
    
    try:
        with open(file_path, 'r', encoding='utf-8') as f:
            lines = f.readlines()
        
        for line_num, line in enumerate(lines, 1):
            line = line.strip()
            
            # 跳过注释和空行
            if not line or line.startswith('#'):
                continue
            
            # 检查 import 语句
            for old_module, new_module in IMPORT_MAPPINGS.items():
                if old_module in line and ('import' in line or 'from' in line):
                    suggested = line.replace(old_module, new_module)
                    old_imports.append((line_num, line, suggested))
    
    except Exception as e:
        print(f"Error reading {file_path}: {e}")
    
    return old_imports


def scan_project(root_dir: str = '.') -> dict:
    """
    扫描整个项目，查找需要更新的导入
    
    Args:
        root_dir: 项目根目录
    
    Returns:
        文件路径到旧导入列表的映射
    """
    print(f"Scanning project in {root_dir}...")
    
    python_files = find_python_files(root_dir)
    print(f"Found {len(python_files)} Python files")
    
    results = {}
    
    for file_path in python_files:
        old_imports = find_old_imports(file_path)
        if old_imports:
            results[str(file_path)] = old_imports
    
    return results


def generate_report(results: dict) -> str:
    """
    生成扫描报告
    
    Args:
        results: 扫描结果
    
    Returns:
        报告文本
    """
    if not results:
        return "✅ No old imports found!"
    
    report_lines = [
        "# Import Update Report",
        "",
        f"Found {len(results)} files with old imports:",
        ""
    ]
    
    for file_path, old_imports in results.items():
        report_lines.append(f"## {file_path}")
        report_lines.append("")
        
        for line_num, old_line, suggested in old_imports:
            report_lines.append(f"Line {line_num}:")
            report_lines.append(f"  Old: {old_line}")
            report_lines.append(f"  New: {suggested}")
            report_lines.append("")
    
    report_lines.append("## Summary")
    report_lines.append("")
    report_lines.append(f"Total files: {len(results)}")
    report_lines.append(f"Total imports to update: {sum(len(imports) for imports in results.values())}")
    
    return "\n".join(report_lines)


def main():
    """主函数"""
    print("=" * 60)
    print("Import Update Scanner")
    print("=" * 60)
    print()
    
    # 扫描项目
    results = scan_project()
    
    # 生成报告
    report = generate_report(results)
    
    # 打印报告
    print()
    print(report)
    
    # 保存报告到文件
    report_file = Path('import_update_report.md')
    with open(report_file, 'w', encoding='utf-8') as f:
        f.write(report)
    
    print()
    print(f"Report saved to: {report_file}")
    
    if results:
        print()
        print("⚠️  Please review and update the imports manually.")
        print("   The old modules are deprecated and will be removed in version 2.0.0")
    else:
        print()
        print("✅ All imports are up to date!")


if __name__ == '__main__':
    main()