import logging
from datetime import datetime, timezone

from fastapi import FastAPI, HTTPException, Depends, Header
from pydantic import BaseModel

from ntr_fetcher.db import Database
from ntr_fetcher.week import get_show_week

logger = logging.getLogger(__name__)


class RefreshRequest(BaseModel):
    full: bool = False


class AddTrackRequest(BaseModel):
    soundcloud_url: str | None = None
    track_id: int | None = None
    position: int | None = None


class MoveTrackRequest(BaseModel):
    position: int


def create_app(db: Database, poller, admin_token: str) -> FastAPI:
    app = FastAPI(title="NtR SoundCloud Fetcher")

    def _require_admin(authorization: str | None = Header(None)):
        if authorization is None or not authorization.startswith("Bearer "):
            raise HTTPException(status_code=401, detail="Missing or invalid token")
        token = authorization.removeprefix("Bearer ")
        if token != admin_token:
            raise HTTPException(status_code=401, detail="Invalid token")

    def _current_show():
        now = datetime.now(timezone.utc)
        week_start, week_end = get_show_week(now, show_day=2, show_hour=22)
        return db.get_or_create_show(week_start, week_end)

    @app.get("/health")
    def health():
        show = _current_show()
        tracks = db.get_show_tracks(show.id)
        return {
            "status": "ok",
            "poller_alive": poller.alive,
            "last_fetch": poller.last_fetch.isoformat() if poller.last_fetch else None,
            "current_week_track_count": len(tracks),
        }

    @app.get("/playlist")
    def playlist():
        show = _current_show()
        tracks = db.get_show_tracks(show.id)
        return {
            "show_id": show.id,
            "week_start": show.week_start.isoformat(),
            "week_end": show.week_end.isoformat(),
            "tracks": tracks,
        }

    @app.get("/playlist/{position}")
    def playlist_track(position: int):
        show = _current_show()
        track = db.get_show_track_by_position(show.id, position)
        if track is None:
            raise HTTPException(status_code=404, detail=f"No track at position {position}")
        return track

    @app.get("/shows")
    def list_shows(limit: int = 20, offset: int = 0):
        shows = db.list_shows(limit=limit, offset=offset)
        return [
            {
                "id": s.id,
                "week_start": s.week_start.isoformat(),
                "week_end": s.week_end.isoformat(),
                "created_at": s.created_at.isoformat(),
            }
            for s in shows
        ]

    @app.get("/shows/{show_id}")
    def show_detail(show_id: int):
        shows = db.list_shows(limit=1000, offset=0)
        show = next((s for s in shows if s.id == show_id), None)
        if show is None:
            raise HTTPException(status_code=404, detail="Show not found")
        tracks = db.get_show_tracks(show.id)
        return {
            "show_id": show.id,
            "week_start": show.week_start.isoformat(),
            "week_end": show.week_end.isoformat(),
            "tracks": tracks,
        }

    @app.post("/admin/refresh")
    async def admin_refresh(body: RefreshRequest = RefreshRequest(), _=Depends(_require_admin)):
        await poller.poll_once(full=body.full)
        show = _current_show()
        tracks = db.get_show_tracks(show.id)
        return {"status": "refreshed", "track_count": len(tracks)}

    @app.post("/admin/tracks")
    def admin_add_track(body: AddTrackRequest, _=Depends(_require_admin)):
        show = _current_show()
        if body.track_id is not None:
            db.add_track_to_show(show.id, body.track_id, body.position)
            return {"status": "added"}
        raise HTTPException(status_code=400, detail="Provide track_id")

    @app.delete("/admin/tracks/{track_id}")
    def admin_remove_track(track_id: int, _=Depends(_require_admin)):
        show = _current_show()
        if not db.has_track_in_show(show.id, track_id):
            raise HTTPException(status_code=404, detail="Track not in current show")
        db.remove_show_track(show.id, track_id)
        return {"status": "removed"}

    @app.put("/admin/tracks/{track_id}/position")
    def admin_move_track(track_id: int, body: MoveTrackRequest, _=Depends(_require_admin)):
        show = _current_show()
        if not db.has_track_in_show(show.id, track_id):
            raise HTTPException(status_code=404, detail="Track not in current show")
        db.move_show_track(show.id, track_id, body.position)
        return {"status": "moved"}

    return app