<?php
/**
 * C-Relay-PG Admin — JSON status endpoint for dashboard polling.
 *
 * Returns all dashboard stats in a single JSON object.
 * Called by index.php's JavaScript every 10 seconds.
 */
require_once __DIR__ . '/../lib/helpers.php';

$pdo = db();

// Service state
$state = $pdo->query("SELECT * FROM caching_service_state WHERE id = 1")->fetch();

// Active backfill target (table may not exist yet on fresh start)
$active = ['active_pubkey' => '', 'active_relay' => ''];
try {
    $active = $pdo->query("SELECT active_pubkey, active_relay FROM caching_backfill_active WHERE id = 1")->fetch() ?: $active;
} catch (PDOException $e) { /* table doesn't exist yet */ }

// Error relay summary (consecutive_errors column may not exist yet on fresh start)
$error_stats = ['auto_completed' => 0, 'error_count' => 0, 'timeout_count' => 0];
try {
    $error_stats = $pdo->query("
        SELECT
            COUNT(*) FILTER (WHERE consecutive_errors >= 3) AS auto_completed,
            COUNT(*) FILTER (WHERE last_status LIKE 'error%') AS error_count,
            COUNT(*) FILTER (WHERE last_status = 'timeout') AS timeout_count
        FROM caching_backfill_relay_progress
    ")->fetch() ?: $error_stats;
} catch (PDOException $e) { /* column/table doesn't exist yet */ }

// Inbox stats
$inbox = $pdo->query("
    SELECT
        COUNT(*) AS pending,
        COUNT(*) FILTER (WHERE source_class = 'live') AS live,
        COUNT(*) FILTER (WHERE source_class = 'backfill') AS backfill
    FROM caching_event_inbox
")->fetch();

// Event count
$events = $pdo->query("SELECT COUNT(*) AS total FROM events")->fetch();

// Heartbeat age
$hb_age = intval($state['heartbeat_at'] ?? 0);
$hb_ago = $hb_age > 0 ? time() - $hb_age : 0;

json_response([
    'service_state'      => $state['service_state'] ?? 'unknown',
    'heartbeat_ago'      => $hb_ago > 0 ? $hb_ago . 's ago' : 'never',
    'config_generation'  => intval($state['config_generation'] ?? 0),
    'followed_count'     => intval($state['followed_author_count'] ?? 0),
    'selected_relays'    => intval($state['selected_relay_count'] ?? 0),
    'connected_relays'   => intval($state['connected_relay_count'] ?? 0),
    'bf_complete'        => intval($state['backfill_authors_complete'] ?? 0),
    'bf_total'           => intval($state['backfill_authors_total'] ?? 0),
    'events_fetched'     => intval($state['events_fetched'] ?? 0),
    'inbox_inserts'      => intval($state['inbox_inserts'] ?? 0),
    'db_events'          => intval($events['total'] ?? 0),
    'inbox_pending'      => intval($inbox['pending'] ?? 0),
    'inbox_live'         => intval($inbox['live'] ?? 0),
    'inbox_backfill'     => intval($inbox['backfill'] ?? 0),
    'error_count'        => intval($error_stats['error_count'] ?? 0),
    'timeout_count'      => intval($error_stats['timeout_count'] ?? 0),
    'auto_completed'     => intval($error_stats['auto_completed'] ?? 0),
    'active_pubkey'      => $active['active_pubkey'] ?? '',
    'active_relay'       => $active['active_relay'] ?? '',
]);