import re
from io import BytesIO
from typing import Iterator

from fastapi import APIRouter, Depends
from fastapi.responses import StreamingResponse
from PIL import Image

from ..dav_file import DavFile
from ._common import FileNameLister, FilePrefixFinder, FilePrefixLoader

router = APIRouter(prefix="/image", tags=["image"])

_lister = FileNameLister(
    remote_path="img",
    re=re.compile(
        r"\.(gif|jpe?g|tiff?|png|bmp)$",
        flags=re.IGNORECASE,
    ),
)

_finder = FilePrefixFinder(_lister)
_loader = FilePrefixLoader(_finder)


@router.get("/list", response_model=list[str])
async def list_images(
    image_file_names: Iterator[str] = Depends(_lister),
) -> list[str]:
    return list(image_file_names)


@router.get("/find/{prefix}", response_model=list[str])
async def find_images(
    file_names: Iterator[str] = Depends(_finder),
) -> list[str]:
    return list(file_names)


@router.get(
    "/get/{prefix}",
    response_class=StreamingResponse,
    responses=_loader.responses,
)
async def get_image(
    prefix: str,
    dav_file: DavFile = Depends(_loader),
) -> str:
    img = Image.open(BytesIO(await dav_file.bytes)).convert("RGB")

    img_buffer = BytesIO()
    img.save(img_buffer, format='JPEG', quality=85)
    img_buffer.seek(0)

    return StreamingResponse(
        content=img_buffer,
        media_type="image/jpeg",
        headers={
            "Content-Disposition": f"filename={prefix}.jpg"
        },
    )