"""Klipy (feed Swipe), etap 2: podstawowy listing i statystyki do pilota.

Właściwy feed z afinicznością, pamięcią widzianych i telemetrią to etap 3
(`/clips/feed`, `/clips/events`). Tu tylko to, czego trzeba, żeby zweryfikować ingest
i odtwarzanie z apki/emulatora: lista najnowszych żywych klipów z filtrem po tagu,
źródle i audio oraz zbiorcze liczniki.
"""
from __future__ import annotations

import uuid
from datetime import datetime

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel
from sqlalchemy import func, select
from sqlalchemy.orm import Session

from app.auth import require_api_key
from app.db import get_session
from app.models.clip import Clip, ClipTag

router = APIRouter(prefix="/clips", tags=["clips"], dependencies=[Depends(require_api_key)])


class ClipOut(BaseModel):
    id: uuid.UUID
    source: str
    source_id: str
    title: str | None
    creator: str | None
    creator_verified: bool
    duration_sec: float | None
    width: int | None
    height: int | None
    has_audio: bool
    content_type: str | None
    niches: list[str]
    tags: list[str]
    hd_url: str | None
    sd_url: str | None
    poster_url: str | None
    thumb_url: str | None
    likes: int
    views: int
    published_at: datetime | None


class ClipListOut(BaseModel):
    items: list[ClipOut]
    limit: int
    offset: int
    has_more: bool


class ClipStatsOut(BaseModel):
    total: int
    alive: int
    dead: int
    with_audio: int
    verified: int
    by_source: dict[str, int]
    newest_published_at: datetime | None
    tags: int


def _tags_for(session: Session, clip_ids: list[uuid.UUID]) -> dict[uuid.UUID, list[str]]:
    if not clip_ids:
        return {}
    out: dict[uuid.UUID, list[str]] = {}
    for cid, tag in session.execute(
        select(ClipTag.clip_id, ClipTag.tag).where(ClipTag.clip_id.in_(clip_ids)).order_by(ClipTag.tag)
    ):
        out.setdefault(cid, []).append(tag)
    return out


@router.get("", response_model=ClipListOut)
def list_clips(
    session: Session = Depends(get_session),
    tag: str | None = Query(default=None, max_length=64),
    source: str | None = Query(default=None, max_length=16),
    creator: str | None = Query(default=None, max_length=128),
    has_audio: bool | None = None,
    max_duration_sec: float | None = Query(default=None, gt=0),
    limit: int = Query(default=50, ge=1, le=200),
    offset: int = Query(default=0, ge=0),
) -> ClipListOut:
    q = select(Clip).where(Clip.dead_at.is_(None))
    if tag:
        q = q.where(Clip.id.in_(select(ClipTag.clip_id).where(ClipTag.tag == tag)))
    if source:
        q = q.where(Clip.source == source)
    if creator:
        q = q.where(Clip.creator == creator)
    if has_audio is not None:
        q = q.where(Clip.has_audio.is_(has_audio))
    if max_duration_sec is not None:
        q = q.where(Clip.duration_sec <= max_duration_sec)
    rows = session.execute(
        q.order_by(Clip.published_at.desc().nullslast(), Clip.id).offset(offset).limit(limit + 1)
    ).scalars().all()
    has_more = len(rows) > limit
    rows = rows[:limit]
    tags = _tags_for(session, [r.id for r in rows])
    items = [
        ClipOut(
            id=r.id,
            source=r.source,
            source_id=r.source_id,
            title=r.title,
            creator=r.creator,
            creator_verified=r.creator_verified,
            duration_sec=r.duration_sec,
            width=r.width,
            height=r.height,
            has_audio=r.has_audio,
            content_type=r.content_type,
            niches=list(r.niches or []),
            tags=tags.get(r.id, []),
            hd_url=r.hd_url,
            sd_url=r.sd_url,
            poster_url=r.poster_url,
            thumb_url=r.thumb_url,
            likes=r.likes,
            views=r.views,
            published_at=r.published_at,
        )
        for r in rows
    ]
    return ClipListOut(items=items, limit=limit, offset=offset, has_more=has_more)


@router.get("/stats", response_model=ClipStatsOut)
def clip_stats(session: Session = Depends(get_session)) -> ClipStatsOut:
    row = session.execute(
        select(
            func.count(),
            func.count().filter(Clip.dead_at.is_(None)),
            func.count().filter(Clip.dead_at.is_not(None)),
            func.count().filter(Clip.has_audio.is_(True), Clip.dead_at.is_(None)),
            func.count().filter(Clip.creator_verified.is_(True), Clip.dead_at.is_(None)),
            func.max(Clip.published_at),
        )
    ).one()
    by_source = {
        s: n for s, n in session.execute(select(Clip.source, func.count()).group_by(Clip.source))
    }
    tags = session.execute(select(func.count(func.distinct(ClipTag.tag)))).scalar_one()
    return ClipStatsOut(
        total=row[0],
        alive=row[1],
        dead=row[2],
        with_audio=row[3],
        verified=row[4],
        by_source=by_source,
        newest_published_at=row[5],
        tags=tags,
    )