from fastapi import APIRouter, Depends, Request
from fastapi.templating import Jinja2Templates
from sqlalchemy import select

from app.db import get_db
from app.models import JobRun
from app.security.deps import require_auth
from app.services import beets_service, credential_service, playlist_service

router = APIRouter(tags=["dashboard"])
templates = Jinja2Templates(directory="app/templates")


def _human_bytes(n: int) -> str:
    size = float(n)
    for unit in ("B", "KB", "MB", "GB", "TB"):
        if size < 1024 or unit == "TB":
            return f"{size:.1f} {unit}"
        size /= 1024
    return f"{size:.1f} TB"


@router.get("/")
async def dashboard(request: Request, user: dict = Depends(require_auth), db=Depends(get_db)):
    stats = beets_service.stats()
    playlists = playlist_service.list_all(db)
    recent_runs = list(
        db.execute(select(JobRun).order_by(JobRun.started_at.desc()).limit(10)).scalars()
    )
    return templates.TemplateResponse(
        request,
        "dashboard.html",
        {
            "user": user,
            "stats": stats,
            "total_size_human": _human_bytes(stats.get("total_bytes", 0)),
            "playlist_count": len(playlists),
            "active_playlist_count": len([p for p in playlists if p.active]),
            "recent_runs": recent_runs,
            "auth_states": credential_service.auth_states(db),
        },
    )