<?php
// Agent metrics history — returns CPU/RAM samples for sparklines
require_once __DIR__ . '/../config.php';
header('Content-Type: application/json');

$agentId = $_GET['agent_id'] ?? '';
$hours   = min((int)($_GET['hours'] ?? 2), 24);

if (!$agentId) {
    // Return all online agents' last 2h in one shot
    $agents = JarvisDB::query(
        "SELECT DISTINCT agent_id FROM agent_metrics WHERE recorded_at > DATE_SUB(NOW(), INTERVAL ? HOUR)",
        [$hours]
    ) ?? [];

    $out = [];
    foreach ($agents as $a) {
        $rows = JarvisDB::query(
            "SELECT CAST(JSON_EXTRACT(metric_data, '$.cpu_percent') AS DECIMAL(5,1)) as cpu,
                    CAST(JSON_EXTRACT(metric_data, '$.memory.percent') AS DECIMAL(5,1)) as mem,
                    recorded_at
             FROM agent_metrics
             WHERE agent_id = ? AND recorded_at > DATE_SUB(NOW(), INTERVAL ? HOUR)
             ORDER BY recorded_at ASC",
            [$a['agent_id'], $hours]
        ) ?? [];
        if ($rows) {
            $out[$a['agent_id']] = array_map(fn($r) => [
                'cpu' => (float)($r['cpu'] ?? 0),
                'mem' => (float)($r['mem'] ?? 0),
            ], $rows);
        }
    }
    echo json_encode($out);
} else {
    $rows = JarvisDB::query(
        "SELECT CAST(JSON_EXTRACT(metric_data, '$.cpu_percent') AS DECIMAL(5,1)) as cpu,
                CAST(JSON_EXTRACT(metric_data, '$.memory.percent') AS DECIMAL(5,1)) as mem,
                recorded_at
         FROM agent_metrics
         WHERE agent_id = ? AND recorded_at > DATE_SUB(NOW(), INTERVAL ? HOUR)
         ORDER BY recorded_at ASC",
        [$agentId, $hours]
    ) ?? [];
    echo json_encode(array_map(fn($r) => [
        'cpu' => (float)($r['cpu'] ?? 0),
        'mem' => (float)($r['mem'] ?? 0),
    ], $rows));
}