"""Lifecycle für media_assets (Papierkorb) — MEDIA_ASSETS_AND_ARCHIVE_SPEC §5."""
from __future__ import annotations

from typing import Literal

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel

from db import get_db, get_cursor
from tenant_context import TenantContext, get_tenant_context
from media_lifecycle import (
    assert_can_manage_media_asset_lifecycle,
    fetch_media_asset_row,
    purge_media_asset,
    transition_recover_from_hidden,
    transition_to_trash_hidden,
    transition_to_trash_soft,
)

router = APIRouter(prefix="/api/media-assets", tags=["media-assets"])


class MediaLifecycleBody(BaseModel):
    action: Literal["trash_soft", "trash_hidden", "recover", "purge"]


@router.post("/{asset_id}/lifecycle")
def post_media_asset_lifecycle(
    asset_id: int,
    body: MediaLifecycleBody,
    tenant: TenantContext = Depends(get_tenant_context),
):
    """Papierkorb-Übergänge (manuell). Rechte gemäß Spec §5.2."""
    with get_db() as conn:
        cur = get_cursor(conn)
        asset = fetch_media_asset_row(cur, asset_id)
        if not asset:
            raise HTTPException(status_code=404, detail="Medium nicht gefunden")
        assert_can_manage_media_asset_lifecycle(cur, tenant, asset)

        action = body.action
        if action == "trash_soft":
            return transition_to_trash_soft(cur, conn, asset_id)
        if action == "trash_hidden":
            return transition_to_trash_hidden(cur, conn, asset_id)
        if action == "recover":
            return transition_recover_from_hidden(cur, conn, asset_id)
        if action == "purge":
            state = (asset.get("lifecycle_state") or "").strip().lower()
            if state != "trash_hidden":
                raise HTTPException(
                    status_code=400,
                    detail="Nur ausgeblendete Medien (Stufe 2) dürfen endgültig gelöscht werden",
                )
            ok = purge_media_asset(cur, conn, asset_id)
            if not ok:
                raise HTTPException(status_code=400, detail="Löschen nicht möglich")
            return {"ok": True, "purged": asset_id}

        raise HTTPException(status_code=500, detail="Interner Fehler: lifecycle action")