from app.db.database import get_connection


HEALTH_STATUSES = ("healthy", "unhealthy", "unreachable")


def get_latest_service_health():
    con = get_connection()

    try:
        rows = con.execute(
            """
            SELECT
                h.service_id,
                COALESCE(a.name, h.service_id) AS service_name,
                h.status,
                h.http_status,
                h.response_time_ms,
                h.error_text,
                h.checked_at
            FROM service_health h
            LEFT JOIN apps a ON a.id = h.service_id
            INNER JOIN (
                SELECT service_id, MAX(id) AS max_id
                FROM service_health
                GROUP BY service_id
            ) latest ON latest.max_id = h.id
            """
        ).fetchall()
    except Exception:
        rows = []

    con.close()
    return {row["service_id"]: dict(row) for row in rows}


def get_service_health(service_id: str):
    con = get_connection()

    try:
        row = con.execute(
            """
            SELECT
                h.service_id,
                COALESCE(a.name, h.service_id) AS service_name,
                h.status,
                h.http_status,
                h.response_time_ms,
                h.error_text,
                h.checked_at
            FROM service_health h
            LEFT JOIN apps a ON a.id = h.service_id
            WHERE h.service_id = ?
            ORDER BY h.id DESC
            LIMIT 1
            """,
            (service_id,),
        ).fetchone()
    except Exception:
        row = None

    con.close()
    return dict(row) if row else None


def get_service_health_history(service_id: str, limit: int = 50):
    con = get_connection()

    try:
        rows = con.execute(
            """
            SELECT id, service_id, status, http_status, response_time_ms, error_text, checked_at
            FROM service_health
            WHERE service_id = ?
            ORDER BY id DESC
            LIMIT ?
            """,
            (service_id, limit),
        ).fetchall()
    except Exception:
        rows = []

    con.close()
    return [dict(row) for row in rows]


def get_health_summary():
    latest = get_latest_service_health()
    summary = {"healthy": 0, "unhealthy": 0, "unreachable": 0}
    for item in latest.values():
        status = item.get("status")
        if status in summary:
            summary[status] += 1
    return summary


def get_problem_service_health():
    latest = get_latest_service_health()
    return [
        item for item in latest.values()
        if item.get("status") in {"unhealthy", "unreachable"}
    ]