from app.db.database import get_connection
from app.db.migrations import run_migrations


def _incident_select() -> str:
    return """
        SELECT
            i.id,
            i.service_id,
            COALESCE(a.name, i.service_id) AS service_name,
            i.status,
            i.started_at,
            i.ended_at,
            CASE
                WHEN i.duration_seconds IS NOT NULL THEN i.duration_seconds
                WHEN LOWER(COALESCE(i.status, '')) = 'open' THEN CAST(strftime('%s', 'now') - strftime('%s', i.started_at) AS INTEGER)
                ELSE NULL
            END AS duration_seconds,
            i.title,
            i.description
        FROM service_incidents i
        LEFT JOIN apps a ON a.id = i.service_id
    """


def get_open_incidents(limit: int | None = None):
    run_migrations()
    con = get_connection()

    sql = f"""
        {_incident_select()}
        WHERE LOWER(COALESCE(i.status, '')) = 'open'
        ORDER BY i.started_at DESC, i.id DESC
    """
    params = ()
    if limit is not None:
        sql += " LIMIT ?"
        params = (limit,)

    rows = con.execute(sql, params).fetchall()
    con.close()
    return [dict(row) for row in rows]


def get_recent_incidents(limit: int = 100):
    run_migrations()
    con = get_connection()

    rows = con.execute(
        f"""
        {_incident_select()}
        ORDER BY i.started_at DESC, i.id DESC
        LIMIT ?
        """,
        (limit,),
    ).fetchall()

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


def get_service_incidents(service_id: str, limit: int = 20):
    run_migrations()
    con = get_connection()

    rows = con.execute(
        f"""
        {_incident_select()}
        WHERE i.service_id = ?
        ORDER BY i.started_at DESC, i.id DESC
        LIMIT ?
        """,
        (service_id, limit),
    ).fetchall()

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


def count_open_incidents() -> int:
    run_migrations()
    con = get_connection()

    row = con.execute(
        """
        SELECT COUNT(*) AS count
        FROM service_incidents
        WHERE LOWER(COALESCE(status, '')) = 'open'
        """
    ).fetchone()

    con.close()
    return row["count"] if row else 0