import os
from pathlib import Path

from fastapi import APIRouter, Depends, HTTPException, status

from materia_server.models import User, Directory, DirectoryInfo
from materia_server.models.directory import DirectoryInfo
from materia_server.routers import middleware
from materia_server.config import Config


router = APIRouter(tags = ["directory"])

@router.post("/directory")
async def create(path: Path = Path(), user: User = Depends(middleware.user), ctx: middleware.Context = Depends()):
    repository_path = Config.data_dir() / "repository" / user.lower_name
    blacklist = [os.sep, ".", "..", "*"]
    directory_path = Path(os.sep.join(filter(lambda part: part not in blacklist, path.parts)))

    async with ctx.database.session() as session:
        session.add(user)
        await session.refresh(user, attribute_names = ["repository"])

        if not user.repository:
            raise HTTPException(status.HTTP_404_NOT_FOUND, "Repository is not found")

        current_directory = None
        current_path = Path()
        directory = None

        for part in directory_path.parts:
            if not await Directory.by_path(user.repository.id, current_path, part, ctx.database):
                directory = Directory(
                    repository_id = user.repository.id,
                    parent_id = current_directory.id if current_directory else None,
                    name = part,
                    path = None if current_path == Path() else str(current_path)
                )
                session.add(directory)

            current_directory = directory 
            current_path /= part

        try:
            (repository_path / directory_path).mkdir(parents = True, exist_ok = True)
        except OSError:
            raise HTTPException(status.HTTP_500_INTERNAL_SERVER_ERROR, "Failed to created a directory")

        await session.commit()

@router.get("/directory")
async def info(path: Path, user: User = Depends(middleware.user), ctx: middleware.Context = Depends()):
    async with ctx.database.session() as session:
        session.add(user)
        await session.refresh(user, attribute_names = ["repository"])

        if not(directory := await Directory.by_path(user.repository.id, None if path.parent == Path() else path.parent, path.name, ctx.database)):
            raise HTTPException(status.HTTP_404_NOT_FOUND, "Directory is not found")

        session.add(directory)
        await session.refresh(directory, attribute_names = ["files"])

        info = DirectoryInfo.model_validate(directory)
        info.used = sum([ file.size for file in directory.files ])

        return info