<?php

namespace App\Filament\Widgets;

use App\Services\PrometheusService;
use Filament\Widgets\ChartWidget;

class PrometheusMemory extends ChartWidget
{
    protected static ?int $sort = 4;

    protected static ?string $heading = '内存占用率';

    // 固定显示的数据点数
    private const MAX_POINTS = 6;

    protected function getData(): array
    {
        $prometheus = new PrometheusService();

        // 查询过去 1 分钟内的每 6 秒一个数据点
        $memoryUsageRange = $prometheus->queryRange(
            '(1 - (avg_over_time(node_memory_MemAvailable_bytes[1m]) / avg_over_time(node_memory_MemTotal_bytes[1m]))) * 100',
            now()->subMinutes(1)->timestamp,
            now()->timestamp,
            6 // 每6秒一个数据点
        );

        $labels = [];
        $data = [];

        if (!empty($memoryUsageRange['data']['result'][0]['values'])) {
            date_default_timezone_set('Asia/Shanghai');

            // 获取内存使用率数据
            $memoryValues = array_column($memoryUsageRange['data']['result'][0]['values'], 1, 0);

            // 只保留最新的 MAX_POINTS 个数据点
            $timestamps = array_keys($memoryValues);
            $timestamps = array_slice($timestamps, -self::MAX_POINTS);

            foreach ($timestamps as $timestamp) {
                $labels[] = date('H:i:s', $timestamp); // 格式化时间戳为小时:分钟:秒
                $data[] = round(floatval($memoryValues[$timestamp]), 2); // 取出每个时间点的内存使用率，并保留两位小数
            }
        }

        return [
            'labels' => $labels,
            'datasets' => [
                [
                    'label' => '内存占用率 (%)',
                    'data' => $data,
                    'borderColor' => '#4CAF50',
                    'backgroundColor' => 'rgba(76, 175, 80, 0.2)',
                    'fill' => true,
                    'tension' => 0.2,
                ],
            ],
        ];
    }

    protected function getType(): string
    {
        return 'line';
    }

    protected function getOptions(): array
    {
        return [
            'scales' => [
                'y' => [
                    'beginAtZero' => true,
                    'min' => 0, // 设置 y 轴最小值
                    'max' => 100, // 设置 y 轴最大值
                ],
            ],
        ];
    }

    protected function getPollingInterval(): ?string
    {
        return '6s'; // 每 6 秒更新一次
    }
}