import io
import uuid
from pathlib import Path

from fastapi import HTTPException, UploadFile
from PIL import Image

from app.core.config import settings

UPLOAD_DIR: Path = settings.upload_path

ALLOWED_IMAGE_TYPES = {
    "image/jpeg", "image/jpg", "image/png", "image/webp", "image/svg+xml",
    "image/heic", "image/heif",
}
ALLOWED_AUDIO_PREFIXES = {"audio/webm", "audio/mp4", "audio/ogg", "audio/x-m4a"}

MAX_ORIG_SIZE = (500, 500)

THUMBNAIL_SIZES = {
    "product": (150, 150),
    "note": (300, 300),
    "attachment": (400, 300),
}


async def save_image(file: UploadFile, context: str = "note") -> dict:
    content_type = (file.content_type or "").lower()
    if content_type not in ALLOWED_IMAGE_TYPES:
        raise HTTPException(status_code=400, detail=f"Format non supporté : {content_type}")

    file_id = str(uuid.uuid4())
    content = await file.read()

    orig_dir = UPLOAD_DIR / "images" / "originals"
    orig_dir.mkdir(parents=True, exist_ok=True)

    if content_type == "image/svg+xml":
        orig_path = orig_dir / f"{file_id}.svg"
        orig_path.write_bytes(content)
        return {
            "file_id": file_id,
            "file_path": str(orig_path.relative_to(UPLOAD_DIR)),
            "thumbnail_path": None,
            "file_type": "image",
        }

    orig_path = orig_dir / f"{file_id}.webp"
    img = Image.open(io.BytesIO(content)).convert("RGB")

    # Redimensionne l'original à 500×500 max en conservant l'aspect ratio
    img.thumbnail(MAX_ORIG_SIZE, Image.LANCZOS)
    img.save(orig_path, "WEBP", quality=85)

    thumb_dir = UPLOAD_DIR / "images" / "thumbnails"
    thumb_dir.mkdir(parents=True, exist_ok=True)
    thumb_path = thumb_dir / f"{file_id}_thumb.webp"

    thumb_size = THUMBNAIL_SIZES.get(context, (300, 300))
    img_thumb = img.copy()
    img_thumb.thumbnail(thumb_size, Image.LANCZOS)
    img_thumb.save(thumb_path, "WEBP", quality=80)

    return {
        "file_id": file_id,
        "file_path": str(orig_path.relative_to(UPLOAD_DIR)),
        "thumbnail_path": str(thumb_path.relative_to(UPLOAD_DIR)),
        "file_type": "image",
    }


async def save_audio(file: UploadFile) -> dict:
    ct = (file.content_type or "").lower().split(";")[0].strip()
    if ct not in ALLOWED_AUDIO_PREFIXES:
        raise HTTPException(status_code=400, detail=f"Format audio non supporté : {file.content_type}")

    file_id = str(uuid.uuid4())
    audio_dir = UPLOAD_DIR / "audio"
    audio_dir.mkdir(parents=True, exist_ok=True)

    ext = ".webm" if "webm" in (file.content_type or "") else ".m4a"
    audio_path = audio_dir / f"{file_id}{ext}"
    audio_path.write_bytes(await file.read())

    return {
        "file_id": file_id,
        "file_path": str(audio_path.relative_to(UPLOAD_DIR)),
        "thumbnail_path": None,
        "file_type": "audio",
    }


def delete_media(file_id: str, file_path: str, thumbnail_path: str | None = None) -> None:
    (UPLOAD_DIR / file_path).unlink(missing_ok=True)
    if thumbnail_path:
        (UPLOAD_DIR / thumbnail_path).unlink(missing_ok=True)