"""
Files API Routes

Provides file browsing capabilities for the Canvas Builder.
"""

from fastapi import APIRouter, Query
from pathlib import Path
from typing import List, Optional
import os

router = APIRouter()

# Path to studies root (go up 5 levels from this file)
_file_path = os.path.abspath(__file__)
ATOMIZER_ROOT = Path(os.path.normpath(os.path.dirname(os.path.dirname(os.path.dirname(
    os.path.dirname(os.path.dirname(_file_path))
)))))
STUDIES_ROOT = ATOMIZER_ROOT / "studies"


@router.get("/list")
async def list_files(
    path: str = "",
    types: str = ".sim,.prt,.fem,.afem"
):
    """
    List files in a directory, filtered by type.

    Args:
        path: Relative path from studies root (empty for root)
        types: Comma-separated list of file extensions to include

    Returns:
        List of files and directories with their paths
    """
    allowed_types = [t.strip().lower() for t in types.split(',') if t.strip()]

    base_path = STUDIES_ROOT / path if path else STUDIES_ROOT

    if not base_path.exists():
        return {"files": [], "path": path, "error": "Directory not found"}

    files = []

    try:
        for entry in sorted(base_path.iterdir(), key=lambda x: (not x.is_dir(), x.name.lower())):
            # Skip hidden files and directories
            if entry.name.startswith('.'):
                continue

            if entry.is_dir():
                # Include directories
                files.append({
                    "name": entry.name,
                    "path": str(entry.relative_to(STUDIES_ROOT)).replace("\\", "/"),
                    "isDirectory": True,
                })
            else:
                # Include files matching type filter
                suffix = entry.suffix.lower()
                if suffix in allowed_types:
                    files.append({
                        "name": entry.name,
                        "path": str(entry.relative_to(STUDIES_ROOT)).replace("\\", "/"),
                        "isDirectory": False,
                        "size": entry.stat().st_size,
                    })
    except PermissionError:
        return {"files": [], "path": path, "error": "Permission denied"}
    except Exception as e:
        return {"files": [], "path": path, "error": str(e)}

    return {"files": files, "path": path}


@router.get("/search")
async def search_files(
    query: str,
    types: str = ".sim,.prt,.fem,.afem",
    max_results: int = 50
):
    """
    Search for files by name pattern.

    Args:
        query: Search pattern (partial name match)
        types: Comma-separated list of file extensions to include
        max_results: Maximum number of results to return

    Returns:
        List of matching files with their paths
    """
    allowed_types = [t.strip().lower() for t in types.split(',') if t.strip()]
    query_lower = query.lower()

    files = []

    def search_recursive(directory: Path, depth: int = 0):
        """Recursively search for matching files"""
        if depth > 10 or len(files) >= max_results:  # Limit depth and results
            return

        try:
            for entry in directory.iterdir():
                if len(files) >= max_results:
                    return

                if entry.name.startswith('.'):
                    continue

                if entry.is_dir():
                    search_recursive(entry, depth + 1)
                elif entry.suffix.lower() in allowed_types:
                    if query_lower in entry.name.lower():
                        files.append({
                            "name": entry.name,
                            "path": str(entry.relative_to(STUDIES_ROOT)).replace("\\", "/"),
                            "isDirectory": False,
                            "size": entry.stat().st_size,
                        })
        except (PermissionError, OSError):
            pass

    search_recursive(STUDIES_ROOT)

    return {"files": files, "query": query, "total": len(files)}


@router.get("/exists")
async def check_file_exists(path: str):
    """
    Check if a file exists.

    Args:
        path: Relative path from studies root

    Returns:
        Boolean indicating if file exists and file info
    """
    file_path = STUDIES_ROOT / path
    exists = file_path.exists()

    result = {
        "exists": exists,
        "path": path,
    }

    if exists:
        result["isDirectory"] = file_path.is_dir()
        if file_path.is_file():
            result["size"] = file_path.stat().st_size
            result["name"] = file_path.name

    return result