"""API routes."""

from datetime import datetime, timezone

from fastapi import APIRouter, File, HTTPException, UploadFile

from app.services.transcriber import transcribe_bytes

router = APIRouter(prefix="/api")

# File size limit: 10 MB
MAX_UPLOAD_SIZE = 10 * 1024 * 1024


@router.get("/health")
async def health():
    """Health check endpoint."""
    return {
        "status": "healthy",
        "service": "micro-api",
        "version": "0.1.0",
        "timestamp": datetime.now(timezone.utc).isoformat(),
    }


@router.post("/transcribe")
async def transcribe_audio(
    file: UploadFile = File(...),
    model: str = "base",
):
    """Transcribe an audio file using Whisper.

    Supported formats: wav, mp3, m4a, ogg, flac, webm.
    Model options: tiny, base, small, medium (default: base).
    """
    # Validate model
    valid_models = {"tiny", "base", "small", "medium"}
    if model not in valid_models:
        raise HTTPException(
            status_code=400,
            detail=f"Invalid model '{model}'. Use: {', '.join(sorted(valid_models))}",
        )

    # Validate file type
    allowed = {"audio/wav", "audio/mpeg", "audio/mp4", "audio/x-m4a",
               "audio/ogg", "audio/flac", "audio/webm", "audio/x-wav"}
    if file.content_type and file.content_type not in allowed:
        raise HTTPException(
            status_code=400,
            detail=f"Unsupported format: {file.content_type}. Supported: wav, mp3, m4a, ogg, flac, webm",
        )

    # Read file
    contents = await file.read()
    if len(contents) > MAX_UPLOAD_SIZE:
        raise HTTPException(
            status_code=413,
            detail=f"File too large. Max {MAX_UPLOAD_SIZE // (1024*1024)} MB.",
        )
    if len(contents) == 0:
        raise HTTPException(400, detail="Empty file.")

    # Transcribe
    try:
        result = transcribe_bytes(contents, model_name=model)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Transcription failed: {str(e)}")

    return {
        "filename": file.filename,
        **result,
    }