"""
Files API Blueprint

Handles endpoints related to file operations and retrieval.
"""

from dataclasses import dataclass
from typing import TYPE_CHECKING

from quart import Blueprint, current_app
from quart_schema import validate_request, validate_response

if TYPE_CHECKING:
    from cosma_backend.app import app as current_app

files_bp = Blueprint('files', __name__)


@dataclass
class FileResponse:
    """Response model for a single file"""
    id: int
    filename: str
    extension: str
    created: str
    modified: str
    summary: str
    keywords: list[str] | None


@dataclass
class FilesListResponse:
    """Response model for list of files"""
    files: list[FileResponse]
    total: int
    page: int
    per_page: int


# @files_bp.get("/")  # type: ignore[return-value]
# @validate_response(FilesListResponse, 200)
# async def list_files() -> tuple[FilesListResponse, int]:
#     """
#     Get a list of all indexed files.
#     
#     GET /api/files/
#     
#     Query parameters:
#         page: Page number (default: 1)
#         per_page: Items per page (default: 50)
#         extension: Filter by file extension
#     
#     Returns:
#         200: List of files
#     """
#     # TODO: Implement file listing with pagination
#     # 1. Get query parameters
#     # 2. Query database with filters and pagination
#     # 3. Return formatted response
#     
#     return FilesListResponse(
#         files=[],
#         total=0,
#         page=1,
#         per_page=50
#     ), 200


@files_bp.get("/<int:file_id>")  # type: ignore[return-value]
@validate_response(FileResponse, 200)
async def get_file(file_id: int) -> tuple[FileResponse, int]:
    """Get details of a specific file by ID"""
    # TODO: Implement single file retrieval
    # 1. Query database for file by ID
    # 2. Return file details or 404
    
    async with current_app.db.acquire() as conn:
        file = await conn.fetchone(
            "SELECT * FROM files WHERE id = ?;",
            (file_id,)
        )
    
    if not file:
        return {"error": "File not found"}, 404  # type: ignore
    
    # TODO: Parse the file data properly
    return FileResponse(
        id=file['id'],
        filename=file['filename'],
        extension=file['extension'],
        created=str(file['created']),
        modified=str(file['modified']),
        summary=file['summary'],
        keywords=None  # TODO: Parse keywords from database
    ), 200


@dataclass
class DeleteFileResponse:
    """Response for file deletion"""
    success: bool
    message: str


# @files_bp.delete("/<int:file_id>")  # type: ignore[return-value]
# @validate_response(DeleteFileResponse, 200)
# async def delete_file(file_id: int) -> tuple[DeleteFileResponse, int]:
#     """
#     Delete a file from the index.
#     
#     DELETE /api/files/{file_id}
#     
#     Returns:
#         200: File deleted successfully
#         404: File not found
#     """
#     # TODO: Implement file deletion
#     # 1. Check if file exists
#     # 2. Delete from database
#     # 3. Return success/failure
#     
#     return DeleteFileResponse(
#         success=True,
#         message=f"File {file_id} deleted successfully"
#     ), 200


@dataclass
class FileStatsResponse:
    """Response for file statistics"""
    total_files: int
    total_size: int
    file_types: dict[str, int]
    last_indexed: str | None


@files_bp.get("/stats")  # type: ignore[return-value]
@validate_response(FileStatsResponse, 200)
async def get_stats() -> tuple[FileStatsResponse, int]:
    """Get statistics about indexed files"""
    # TODO: Implement statistics gathering
    # 1. Count total files
    # 2. Group by extension
    # 3. Get most recent index timestamp
    
    async with current_app.db.acquire() as conn:
        total = await conn.fetchone("SELECT COUNT(*) as count FROM files;")
    
    return FileStatsResponse(
        total_files=total['count'] if total else 0,
        total_size=0,  # TODO: Add size tracking
        file_types={},
        last_indexed=None
    ), 200
