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

DEPLOYMENT_SUCCESS_STATUSES = ("ok", "success", "succeeded", "done", "deployed", "completed")
DEPLOYMENT_FAILED_STATUSES = ("failed", "failure", "error", "cancelled", "canceled")
DEPLOYMENT_RUNNING_STATUSES = ("running", "pending", "queued", "in_progress", "starting")


def _table_columns(con, table_name: str) -> set[str]:
    rows = con.execute(f"PRAGMA table_info({table_name})").fetchall()
    return {row["name"] for row in rows}


def get_operations_summary():
    run_migrations()
    con = get_connection()

    workers = con.execute(
        """
        SELECT last_seen_at
        FROM workers
        """
    ).fetchall()
    workers_online = sum(1 for worker in workers if is_worker_online(worker["last_seen_at"]))

    running_jobs = con.execute(
        """
        SELECT COUNT(*) AS count
        FROM jobs
        WHERE status = 'running'
        """
    ).fetchone()["count"]
    queued_jobs = con.execute(
        """
        SELECT COUNT(*) AS count
        FROM jobs
        WHERE status = 'queued'
        """
    ).fetchone()["count"]
    failed_jobs_24h = con.execute(
        """
        SELECT COUNT(*) AS count
        FROM jobs
        WHERE status = 'failed'
          AND created_at >= datetime('now', '-24 hours')
        """
    ).fetchone()["count"]

    deployment_columns = _table_columns(con, "deployments")
    deployments_today = 0
    if "created_at" in deployment_columns:
        deployments_today = con.execute(
            """
            SELECT COUNT(*) AS count
            FROM deployments
            WHERE date(created_at) = date('now')
            """
        ).fetchone()["count"]
    elif "started_at" in deployment_columns:
        deployments_today = con.execute(
            """
            SELECT COUNT(*) AS count
            FROM deployments
            WHERE date(started_at) = date('now')
            """
        ).fetchone()["count"]

    app_columns = _table_columns(con, "apps")
    if "enabled" in app_columns:
        active_applications = con.execute(
            """
            SELECT COUNT(*) AS count
            FROM apps
            WHERE enabled = 1
               OR LOWER(CAST(enabled AS TEXT)) IN ('1', 'true', 'yes', 'enabled')
            """
        ).fetchone()["count"]
    else:
        active_applications = con.execute(
            """
            SELECT COUNT(*) AS count
            FROM apps
            WHERE LOWER(COALESCE(status, '')) NOT IN ('disabled', 'deleted', 'archived')
            """
        ).fetchone()["count"]

    con.close()
    return {
        "workers_online": workers_online,
        "running_jobs": running_jobs,
        "queued_jobs": queued_jobs,
        "failed_jobs_24h": failed_jobs_24h,
        "deployments_today": deployments_today,
        "active_applications": active_applications,
    }


def get_recent_jobs(limit: int = 20):
    run_migrations()
    con = get_connection()

    rows = con.execute(
        """
        SELECT id, type, target_type, target_id, status, source, created_at
        FROM jobs
        ORDER BY id DESC
        LIMIT ?
        """,
        (limit,),
    ).fetchall()

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


def get_recent_deployments(limit: int = 20):
    con = get_connection()

    rows = con.execute(
        """
        SELECT id, app_id, kind, status, started_at, finished_at, trigger_source
        FROM deployments
        ORDER BY id DESC
        LIMIT ?
        """,
        (limit,),
    ).fetchall()

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


def get_recent_audit_events(limit: int = 20):
    con = get_connection()

    rows = con.execute(
        """
        SELECT id, username, action, target_type, target_id, source, created_at
        FROM audit_events
        ORDER BY id DESC
        LIMIT ?
        """,
        (limit,),
    ).fetchall()

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


def get_operations_snapshot():
    run_migrations()
    con = get_connection()

    workers = con.execute(
        """
        SELECT id, status, started_at, last_seen_at, current_job_id, metadata_json
        FROM workers
        ORDER BY last_seen_at DESC, id
        LIMIT 20
        """
    ).fetchall()
    recent_workers = []
    workers_online = 0
    for row in workers:
        worker = dict(row)
        worker["online"] = is_worker_online(worker.get("last_seen_at"))
        workers_online += 1 if worker["online"] else 0
        recent_workers.append(worker)

    total_workers = con.execute("SELECT COUNT(*) AS count FROM workers").fetchone()["count"]
    online_all = con.execute("SELECT last_seen_at FROM workers").fetchall()
    workers_online = sum(1 for worker in online_all if is_worker_online(worker["last_seen_at"]))

    jobs_summary = con.execute(
        """
        SELECT
            SUM(CASE WHEN status = 'queued' THEN 1 ELSE 0 END) AS queued,
            SUM(CASE WHEN status = 'running' THEN 1 ELSE 0 END) AS running,
            SUM(CASE WHEN status = 'failed' AND created_at >= datetime('now', '-24 hours') THEN 1 ELSE 0 END) AS failed_24h,
            SUM(CASE WHEN status = 'success' AND created_at >= datetime('now', '-24 hours') THEN 1 ELSE 0 END) AS success_24h
        FROM jobs
        """
    ).fetchone()
    recent_jobs = con.execute(
        """
        SELECT id, type, target_type, target_id, status, source, created_at, started_at, finished_at
        FROM jobs
        ORDER BY id DESC
        LIMIT 20
        """
    ).fetchall()

    deployments_summary = con.execute(
        f"""
        SELECT
            SUM(CASE WHEN LOWER(COALESCE(status, '')) IN ({','.join('?' for _ in DEPLOYMENT_RUNNING_STATUSES)}) THEN 1 ELSE 0 END) AS running,
            SUM(CASE WHEN LOWER(COALESCE(status, '')) IN ({','.join('?' for _ in DEPLOYMENT_FAILED_STATUSES)}) AND started_at >= datetime('now', '-24 hours') THEN 1 ELSE 0 END) AS failed_24h,
            SUM(CASE WHEN LOWER(COALESCE(status, '')) IN ({','.join('?' for _ in DEPLOYMENT_SUCCESS_STATUSES)}) AND started_at >= datetime('now', '-24 hours') THEN 1 ELSE 0 END) AS success_24h
        FROM deployments
        """,
        (*DEPLOYMENT_RUNNING_STATUSES, *DEPLOYMENT_FAILED_STATUSES, *DEPLOYMENT_SUCCESS_STATUSES),
    ).fetchone()
    recent_deployments = con.execute(
        """
        SELECT id, app_id, kind, status, started_at, finished_at, trigger_source
        FROM deployments
        ORDER BY id DESC
        LIMIT 20
        """
    ).fetchall()
    recent_audit = con.execute(
        """
        SELECT id, username, action, target_type, target_id, source, created_at
        FROM audit_events
        ORDER BY id DESC
        LIMIT 20
        """
    ).fetchall()

    con.close()
    return {
        "type": "operations.snapshot",
        "jobs": {
            "queued": jobs_summary["queued"] or 0,
            "running": jobs_summary["running"] or 0,
            "failed_24h": jobs_summary["failed_24h"] or 0,
            "success_24h": jobs_summary["success_24h"] or 0,
            "recent": [dict(row) for row in recent_jobs],
        },
        "workers": {
            "online": workers_online,
            "offline": max(0, total_workers - workers_online),
            "recent": recent_workers,
        },
        "deployments": {
            "running": deployments_summary["running"] or 0,
            "failed_24h": deployments_summary["failed_24h"] or 0,
            "success_24h": deployments_summary["success_24h"] or 0,
            "recent": [dict(row) for row in recent_deployments],
        },
        "audit": {
            "recent": [dict(row) for row in recent_audit],
        },
    }