"""
Router "image" provides:

- listing image files
- finding image files by name prefix
- getting image files in a uniform format by name prefix
"""

import logging
from io import BytesIO

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

from ...core.config import Config, ImageUIConfig
from ...core.dav.webdav import WebDAV
from ...core.dav_common import webdav_ensure_files, webdav_ensure_path
from ._common import LM_IMAGE, RP_IMAGE, get_config

_logger = logging.getLogger(__name__)

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


@router.on_event("startup")
async def start_router() -> None:
    _logger.debug(f"{router.prefix} router starting.")

    remote_path = await RP_IMAGE()
    if not webdav_ensure_path(remote_path):
        webdav_ensure_files(
            remote_path,
            "img1.jpg",
            "img2.jpg",
            "img3.jpg",
        )


@router.get(
    "/list",
    responses=LM_IMAGE.lister.responses,
)
async def list_images(
    names: list[str] = Depends(LM_IMAGE.lister.func),
) -> list[str]:
    return names


@router.get(
    "/find/{prefix}",
    responses=LM_IMAGE.filter.responses,
)
async def find_images_by_prefix(
    names: list[str] = Depends(LM_IMAGE.filter.func),
) -> list[str]:
    return names


@router.get(
    "/get/{prefix}",
    responses=LM_IMAGE.getter.responses,
    response_class=StreamingResponse,
)
async def get_image_by_prefix(
    cfg: Config = Depends(get_config),
    remote_path: str = Depends(RP_IMAGE),
    name: str = Depends(LM_IMAGE.getter.func),
) -> StreamingResponse:
    img = Image.open(BytesIO(await WebDAV.read_bytes(f"{remote_path}/{name}")))

    img_buffer = BytesIO()

    width, height = img.size
    target_height = cfg.image.height
    target_width = int(width * target_height / height)

    img = img.resize(
        size=(target_width, target_height),
        resample=Image.LANCZOS,
    )

    img.save(img_buffer, **cfg.image.save_params)
    img_buffer.seek(0)

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


@router.get("/config")
async def get_ui_config(
    cfg: Config = Depends(get_config),
) -> ImageUIConfig:
    return cfg.image