"""
FastAPI dependencies.

Provides database sessions, settings, and common dependencies.
"""

import os
from functools import lru_cache
from typing import Generator

import django
from django.conf import settings as django_settings

# Initialize Django
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mpr.settings")
django.setup()

from mpr.media_assets.models import MediaAsset, TranscodeJob, TranscodePreset


@lru_cache
def get_settings():
    """Get Django settings."""
    return django_settings


def get_asset(asset_id: str) -> MediaAsset:
    """Get asset by ID or raise 404."""
    from fastapi import HTTPException

    try:
        return MediaAsset.objects.get(id=asset_id)
    except MediaAsset.DoesNotExist:
        raise HTTPException(status_code=404, detail="Asset not found")


def get_preset(preset_id: str) -> TranscodePreset:
    """Get preset by ID or raise 404."""
    from fastapi import HTTPException

    try:
        return TranscodePreset.objects.get(id=preset_id)
    except TranscodePreset.DoesNotExist:
        raise HTTPException(status_code=404, detail="Preset not found")


def get_job(job_id: str) -> TranscodeJob:
    """Get job by ID or raise 404."""
    from fastapi import HTTPException

    try:
        return TranscodeJob.objects.get(id=job_id)
    except TranscodeJob.DoesNotExist:
        raise HTTPException(status_code=404, detail="Job not found")