<?php
/**
 * admin/api/kind_1_report.php — Markdown relay status report.
 *
 * Returns a markdown-formatted relay status report suitable for use as
 * a kind 1 event content. Includes:
 *   - Relay name header
 *   - 1H ASCII chart (event rate)
 *   - Database overview
 *   - Top 10 event kinds
 *   - Time-based statistics
 *   - Top pubkeys
 *
 * Accessible at: /relay/admin/api/kind_1_report.php
 */
require_once __DIR__ . '/../lib/helpers.php';
require_once __DIR__ . '/../lib/ascii_chart.php';

header('Content-Type: text/plain; charset=utf-8');

$pdo = db();

// --- Relay info ---
$relay_name = 'C-Relay-PG';
$relay_version = '';
try {
    $relay_name = $pdo->query("SELECT value FROM config WHERE key = 'relay_name'")->fetchColumn() ?: 'C-Relay-PG';
    $relay_version = $pdo->query("SELECT value FROM config WHERE key = 'relay_version'")->fetchColumn() ?: '';
} catch (PDOException $e) {}
$display_name = $relay_version ? "$relay_name v$relay_version" : $relay_name;

// --- Total events ---
$total_events = 0;
try {
    $total_events = intval($pdo->query("SELECT COUNT(*) FROM events")->fetchColumn());
} catch (PDOException $e) {}

// --- Database size ---
$db_size = '-';
try {
    $bytes = intval($pdo->query("SELECT pg_database_size(current_database())")->fetchColumn());
    if ($bytes < 1073741824) {
        $db_size = round($bytes / 1048576, 1) . ' MB';
    } else {
        $db_size = round($bytes / 1073741824, 2) . ' GB';
    }
} catch (PDOException $e) {}

// --- Process ID ---
$process_id = '-';
try {
    $pid = $pdo->query("SELECT pg_backend_pid()")->fetchColumn();
    $process_id = strval($pid);
} catch (PDOException $e) {}

// --- WebSocket connections (estimate from pg_class) ---
$ws_connections = 0;
try {
    $est = intval($pdo->query("SELECT reltuples FROM pg_class WHERE relname = 'subscriptions'")->fetchColumn());
    $ws_connections = max(0, intval($est * 0.2));
} catch (PDOException $e) {}

// --- Active subscriptions (same estimate) ---
$active_subscriptions = $ws_connections;

// --- Memory usage ---
$memory_usage = '-';
$mem_total = 0;
$mem_avail = 0;
$meminfo = @file_get_contents('/proc/meminfo');
if ($meminfo !== false) {
    // /proc/meminfo uses "Key:       Value kB" format (colon, not equals sign)
    foreach (explode("\n", $meminfo) as $line) {
        if (preg_match('/^MemTotal:\s+(\d+)\s+kB/i', $line, $m)) {
            $mem_total = intval($m[1]) * 1024;
        } elseif (preg_match('/^MemAvailable:\s+(\d+)\s+kB/i', $line, $m)) {
            $mem_avail = intval($m[1]) * 1024;
        }
    }
}
if ($mem_total > 0) {
    $used = $mem_total - $mem_avail;
    if ($used < 1073741824) {
        $memory_usage = round($used / 1048576, 1) . ' MB / ' . round($mem_total / 1073741824, 2) . ' GB';
    } else {
        $memory_usage = round($used / 1073741824, 2) . ' GB / ' . round($mem_total / 1073741824, 2) . ' GB';
    }
}

// --- CPU ---
$cpu_usage = '-';
$cpu_core = '-';
if (is_readable('/proc/cpuinfo')) {
    $cores = intval(@shell_exec('nproc 2>/dev/null') ?: 1);
    $cpu_core = strval($cores) . ' cores';
}
$load = @file_get_contents('/proc/loadavg');
if ($load !== false) {
    $cpu_usage = trim(explode(' ', $load)[0] ?? '-');
}

// --- Oldest / newest event ---
$oldest_event = '-';
$newest_event = '-';
try {
    $row = $pdo->query("SELECT MIN(created_at) AS oldest, MAX(created_at) AS newest FROM events")->fetch();
    if ($row && $row['oldest']) $oldest_event = date('Y-m-d H:i:s', intval($row['oldest']));
    if ($row && $row['newest']) $newest_event = date('Y-m-d H:i:s', intval($row['newest']));
} catch (PDOException $e) {}

// --- Time-based stats ---
$now = time();
$events_24h = 0; $events_7d = 0; $events_30d = 0;
try {
    $events_24h = intval($pdo->query("SELECT COUNT(*) FROM events WHERE created_at >= $now - 86400")->fetchColumn());
    $events_7d  = intval($pdo->query("SELECT COUNT(*) FROM events WHERE created_at >= $now - 604800")->fetchColumn());
    $events_30d = intval($pdo->query("SELECT COUNT(*) FROM events WHERE created_at >= $now - 2592000")->fetchColumn());
} catch (PDOException $e) {}

// --- Kind distribution (top 10) ---
$kinds = [];
try {
    $rows = $pdo->query("SELECT kind, COUNT(*) AS cnt FROM events GROUP BY kind ORDER BY cnt DESC LIMIT 10")->fetchAll();
    foreach ($rows as $r) {
        $kinds[] = ['kind' => intval($r['kind']), 'count' => intval($r['cnt']), 'pct' => $total_events > 0 ? round(intval($r['cnt']) / $total_events * 100, 1) : 0];
    }
} catch (PDOException $e) {}

// --- Top pubkeys (top 20) ---
$top_pubkeys = [];
try {
    $rows = $pdo->query("
        SELECT pubkey, COUNT(*) AS cnt
        FROM events
        GROUP BY pubkey
        ORDER BY cnt DESC LIMIT 20
    ")->fetchAll();
    $pubkeys = array_column($rows, 'pubkey');
    $pmap = profile_map($pubkeys);
    foreach ($rows as $r) {
        $pk = $r['pubkey'];
        $prof = $pmap[$pk] ?? null;
        $top_pubkeys[] = [
            'pubkey' => $pk,
            'name'   => $prof ? $prof['best_name'] : '',
            'count'  => intval($r['cnt']),
            'pct'    => $total_events > 0 ? round(intval($r['cnt']) / $total_events * 100, 1) : 0,
        ];
    }
} catch (PDOException $e) {}

// --- 1H ASCII chart (30 bins of 2 minutes each) ---
$chart = '';
try {
    $span = 3600;
    $bin_size = 120;  // 2 minutes
    $num_bins = 30;
    $epoch = $now - $span;
    $base_bin = (int)floor($epoch / $bin_size);
    $sql = "SELECT FLOOR(created_at / {$bin_size})::BIGINT - {$base_bin} AS bin, COUNT(*) AS cnt
            FROM events
            WHERE created_at >= {$epoch}
            GROUP BY bin
            ORDER BY bin";
    $rows = $pdo->query($sql)->fetchAll();
    $bins = build_bin_array($rows, $num_bins);
    $bins = array_reverse($bins);
    $chart = render_ascii_chart($bins, [
        'title'          => 'Event Rate (Last Hour)',
        'max_height'     => 11,
        'bin_duration'   => $bin_size,
        'label_interval' => 5,  // label every 5 bins (10 min)
    ]);
} catch (PDOException $e) {
    $chart = "Chart unavailable\n";
}

// ================================
// BUILD MARKDOWN OUTPUT
// ================================

$output = '';

// Chart
$output .= "## laantungir.net/relay\n\n";
$output .= "```\n$chart```\n";

// Database Overview
$output .= "## Database Overview\n\n";
$output .= "| Metric | Value |\n";
$output .= "|--------|-------|\n";
$output .= "| Database Size | $db_size |\n";
$output .= "| Total Events | " . number_format($total_events) . " |\n";
$output .= "| Process ID | $process_id |\n";
$output .= "| WebSocket Connections | " . number_format($ws_connections) . " |\n";
$output .= "| Active Subscriptions | " . number_format($active_subscriptions) . " |\n";
$output .= "| Memory Usage | $memory_usage |\n";
$output .= "| CPU Usage | $cpu_usage |\n";
$output .= "| CPU Core | $cpu_core |\n";
$output .= "| Oldest Event | $oldest_event |\n";
$output .= "| Newest Event | $newest_event |\n\n";

// Event Kinds (Top 10)
$output .= "## Event Kinds (Top 10)\n\n";
$output .= "| Kind | Count | % |\n";
$output .= "|------|-------|---|\n";
foreach ($kinds as $k) {
    $output .= "| {$k['kind']} | " . number_format($k['count']) . " | {$k['pct']}% |\n";
}
$output .= "\n";

// Time-Based Statistics
$output .= "## Time-Based Statistics\n\n";
$output .= "| Period | Events |\n";
$output .= "|--------|-------|\n";
$output .= "| 24 Hours | " . number_format($events_24h) . " |\n";
$output .= "| 7 Days | " . number_format($events_7d) . " |\n";
$output .= "| 30 Days | " . number_format($events_30d) . " |\n\n";

// Top Pubkeys
$output .= "## Top Pubkeys\n\n";
$output .= "| Name | Events | % |\n";
$output .= "|------|-------|---|\n";
foreach ($top_pubkeys as $p) {
    if ($p['name']) {
        $name = $p['name'];
    } else {
        $name = substr($p['pubkey'], 0, 4) . '..' . substr($p['pubkey'], -4);
    }
    $output .= "| $name | " . number_format($p['count']) . " | {$p['pct']}% |\n";
}
$output .= "\n";

// Footer
$output .= "---\n";
$output .= "_Report generated: " . date('Y-m-d H:i:s T') . "_\n";

echo $output;