from fastapi import APIRouter, Depends, Form, HTTPException, Request
from fastapi.responses import RedirectResponse
from fastapi.templating import Jinja2Templates

from app.db import get_db
from app.security.deps import require_auth
from app.services import beets_service, genre_fix, library_edit, retag

router = APIRouter(prefix="/library", tags=["library"])
templates = Jinja2Templates(directory="app/templates")


@router.get("")
async def library_index(request: Request, grouping: str | None = None, user: dict = Depends(require_auth)):
    items = beets_service.query_items(grouping=grouping)
    return templates.TemplateResponse(
        request, "library/index.html", {"items": items, "grouping": grouping}
    )


@router.get("/track/{item_id}")
async def track_detail(request: Request, item_id: int, user: dict = Depends(require_auth)):
    item = beets_service.get_item(item_id)
    if item is None:
        raise HTTPException(404, "no such track")
    return templates.TemplateResponse(
        request,
        "library/track_detail.html",
        {"item": item, "editable_fields": library_edit.EDITABLE_FIELDS},
    )


@router.post("/track/{item_id}")
async def update_track(
    request: Request,
    item_id: int,
    user: dict = Depends(require_auth),
    db=Depends(get_db),
):
    form = await request.form()
    changes = {
        field: value
        for field, value in form.items()
        if field in library_edit.EDITABLE_FIELDS and value != ""
    }
    changed_by = user.get("email") or user.get("sub", "unknown")
    changed = await library_edit.update_track_fields(db, item_id, changes, changed_by)
    return RedirectResponse(url=f"/library/track/{item_id}?changed={len(changed)}", status_code=303)


@router.post("/track/{item_id}/genre")
async def set_genre(
    item_id: int,
    artist: str = Form(...),
    genre: str = Form(...),
    user: dict = Depends(require_auth),
):
    changed_by = user.get("email") or user.get("sub", "unknown")
    await genre_fix.set_artist_genre(artist, genre, changed_by)
    return RedirectResponse(url=f"/library/track/{item_id}", status_code=303)


@router.post("/track/{item_id}/retag")
async def retag_track(
    item_id: int,
    url: str = Form(...),
    keep_genre: bool = Form(False),
    user: dict = Depends(require_auth),
):
    item = beets_service.get_item(item_id)
    if item is None:
        raise HTTPException(404, "no such track")
    changed_by = user.get("email") or user.get("sub", "unknown")
    await retag.retag_from_url(item["path"], url, changed_by, keep_genre=keep_genre)
    return RedirectResponse(url=f"/library/track/{item_id}", status_code=303)