"""GET /api/episodes — paginated episode browser."""

from flask import Blueprint, jsonify, request

from ..db import get_db

bp = Blueprint("episodes", __name__)


@bp.route("/episodes")
def list_episodes():
    db = get_db()
    page = request.args.get("page", 1, type=int)
    per_page = request.args.get("per_page", 20, type=int)
    per_page = min(per_page, 100)
    feed = request.args.get("feed")
    status = request.args.get("status")

    conditions = []
    params = []

    if feed:
        conditions.append("feed_name = ?")
        params.append(feed)

    if status == "downloaded":
        conditions.append("downloaded = 1")
    elif status == "queued":
        conditions.append("queued = 1")
    elif status == "played":
        conditions.append("played = 1")

    where = f"WHERE {' AND '.join(conditions)}" if conditions else ""

    total = db.execute(
        f"SELECT COUNT(*) as c FROM episodes {where}", params
    ).fetchone()["c"]

    offset = (page - 1) * per_page
    rows = db.execute(
        f"""SELECT * FROM episodes {where}
            ORDER BY discovered DESC
            LIMIT ? OFFSET ?""",
        params + [per_page, offset],
    ).fetchall()

    return jsonify({
        "episodes": [dict(r) for r in rows],
        "total": total,
        "page": page,
        "per_page": per_page,
        "pages": (total + per_page - 1) // per_page,
    })


@bp.route("/episodes/feeds")
def list_episode_feeds():
    """Return distinct feed names for filter dropdowns."""
    db = get_db()
    rows = db.execute(
        "SELECT DISTINCT feed_name FROM episodes ORDER BY feed_name"
    ).fetchall()
    return jsonify([r["feed_name"] for r in rows])