"""
File tools - sandboxed file system operations.
"""

from typing import Optional, List
from pathlib import Path
from .base import tool, ToolResult


# TODO: Configure allowed paths
ALLOWED_PATHS: List[Path] = []


def _validate_path(path: str) -> Optional[str]:
    """Validate path is within allowed directories."""
    # TODO: Implement chroot validation
    # resolved = Path(path).resolve()
    # for allowed in ALLOWED_PATHS:
    #     if resolved.is_relative_to(allowed):
    #         return None
    # return f"Path {path} not in allowed directories"
    return None  # Stub: allow all for now


@tool
async def read_file(
    path: str,
    encoding: str = "utf-8",
    binary: bool = False,
) -> ToolResult:
    """
    Read contents of a file.

    Args:
        path: Path to file
        encoding: Text encoding (default: utf-8)
        binary: Return base64 if true (default: false)

    Security:
        - Chroot to allowed directories
        - No path traversal (..)
        - Size limit enforced
    """
    if error := _validate_path(path):
        return ToolResult(success=False, error=error)

    # TODO: Implement
    # try:
    #     p = Path(path)
    #     if binary:
    #         import base64
    #         content = base64.b64encode(p.read_bytes()).decode()
    #     else:
    #         content = p.read_text(encoding=encoding)
    #     return ToolResult(success=True, data=content)
    # except Exception as e:
    #     return ToolResult(success=False, error=str(e))

    return ToolResult(success=False, error="Not implemented")


@tool
async def write_file(
    path: str,
    content: str,
    mode: str = "overwrite",
    encoding: str = "utf-8",
) -> ToolResult:
    """
    Write content to a file.

    Args:
        path: Path to file
        content: Content to write
        mode: "overwrite" or "append" (default: overwrite)
        encoding: Text encoding (default: utf-8)

    Security:
        - Chroot to allowed directories
        - No path traversal
        - Max file size enforced
    """
    if error := _validate_path(path):
        return ToolResult(success=False, error=error)

    # TODO: Implement
    # try:
    #     p = Path(path)
    #     if mode == "append":
    #         with open(p, "a", encoding=encoding) as f:
    #             f.write(content)
    #     else:
    #         p.write_text(content, encoding=encoding)
    #     return ToolResult(success=True, data={"bytes_written": len(content.encode(encoding))})
    # except Exception as e:
    #     return ToolResult(success=False, error=str(e))

    return ToolResult(success=False, error="Not implemented")


@tool
async def list_dir(
    path: str,
    pattern: str = "*",
) -> ToolResult:
    """
    List directory contents.

    Args:
        path: Directory path
        pattern: Glob pattern filter (default: *)

    Returns:
        Array of {name, type, size, modified}
    """
    if error := _validate_path(path):
        return ToolResult(success=False, error=error)

    # TODO: Implement
    # try:
    #     p = Path(path)
    #     entries = []
    #     for entry in p.glob(pattern):
    #         stat = entry.stat()
    #         entries.append({
    #             "name": entry.name,
    #             "type": "dir" if entry.is_dir() else "file",
    #             "size": stat.st_size,
    #             "modified": stat.st_mtime,
    #         })
    #     return ToolResult(success=True, data=entries)
    # except Exception as e:
    #     return ToolResult(success=False, error=str(e))

    return ToolResult(success=False, error="Not implemented")