<?php

class UptimeKumaMetrics
{
    protected string $raw;
    private array $monitors = [];

    public function __construct(string $raw)
    {
        $this->raw = $raw;
    }

    public function process(): self
    {
        $processed = explode(PHP_EOL, $this->raw);

        $monitors = array_filter($processed, function (string $item) {
            return str_starts_with($item, 'monitor_status');
        });
        // TODO: parse the latencies and add them on to the info card
        $latencies = array_filter($processed, function (string $item) {
            return str_starts_with($item, 'monitor_response_time');
        });

        $monitors = array_map(function (string $item) {
            return $this->parseMonitorStatus($item);
        }, $monitors);
        $this->addLatencyToMonitors($monitors, $latencies);
        $this->monitors = array_values(array_filter($monitors));

        return $this;
    }

    public function getMonitors(): array
    {
        return $this->monitors;
    }

    private function parseMonitorStatus(string $status): ?array
    {
        if (substr($status, -1) === '2') {
            return null;
        }

        if (preg_match('/{(.*?)}/', $status, $match) != 1) {
            return null;
        }

        $matches = explode(',', $match[1]);

        $data = [];
        foreach ($matches as $match) {
            switch (true) {
                case str_starts_with($match, "monitor_name"):
                    $data['name'] = $this->getStringBetweenQuotes($match);
                    break;
                case str_starts_with($match, "monitor_url"):
                    $data['url'] = $this->getStringBetweenQuotes($match);
                    break;
                case str_starts_with($match, "monitor_type"):
                    $data['type'] = $this->getStringBetweenQuotes($match);
                    break;
            }
        }

        $up = (substr($status, -1)) == '0' ? false : true;
        $data['status'] = $up;

        return $data;
    }

    private function addLatencyToMonitors(array &$monitors, array $latencies)
    {
        $latencies = $this->getLatenciesByName($latencies);
        foreach ($monitors as &$monitor) {
            $monitor['latency'] = $latencies[$monitor['name']] ?? null;
        }
    }

    private function getLatenciesByName(array $latencies): array
    {
        $l = [];

        foreach ($latencies as $latency) {
            if (preg_match('/monitor_name="(.*)",monitor_type.* ([0-9]{1,})$/', $latency, $match)) {
                $l[$match[1]] = (int) $match[2];
            }
            continue;
        }

        return $l;
    }

    private function getStringBetweenQuotes(string $input): string
    {
        if (preg_match('/"(.*?)"/', $input, $match) == 1) {
            return $match[1];
        }
        return '';
    }
}