<?php

class DeviceMonitoringController extends mfBaseController
{
    private string $ZABBIX_API_URL = ZABBIX_API_URL;
    private string $ZABBIX_API_KEY = ZABBIX_API_KEY;
    private ?Zabbix $zabbix = null;

    protected function init(): void
    {
        $this->needlogin = true;
        $me = new User();
        $me->loadMe();
        $this->layout()->set("me", $me);
        $this->me = $me;

        if (!$this->me->is("Admin")) {
            http_response_code(403);
            self::returnJson(['success' => false, 'message' => 'Permission denied']);
            die();
        }

        if (defined('ZABBIX_API_URL') && defined('ZABBIX_API_KEY') && ZABBIX_API_URL && ZABBIX_API_KEY) {
            $this->zabbix = new Zabbix($this->ZABBIX_API_URL, $this->ZABBIX_API_KEY);
        } else {
            http_response_code(500);
            self::returnJson(['error' => 'Zabbix API is not configured on the server.']);
            die();
        }
        $this->postData = json_decode(file_get_contents('php://input'), true) ?? [];
    }

    /**
     * Gets a list of all available interfaces, grouping Sent/Received items.
     */
    protected function listInterfacesAction()
    {
        $hostId = $this->request->hostId;
        $items = $this->zabbix->getHostInterfaceItems($hostId);
        $interfaces = [];

        foreach ($items as $item) {
            $baseName = preg_replace('/:\s*Bits\s*(sent|received)$/i', '', $item['name']);
            $direction = str_contains(strtolower($item['name']), 'received') ? 'rx' : 'tx';

            if (!isset($interfaces[$baseName])) {
                $interfaces[$baseName] = ['name' => $baseName, 'rx' => null, 'tx' => null];
            }
            $interfaces[$baseName][$direction] = $item;
        }

        $sortedInterfaces = array_values($interfaces);
        usort($sortedInterfaces, fn($a, $b) => strcmp($a['name'], $b['name']));
        self::returnJson($sortedInterfaces);
    }

    /**
     * Gets historical data for a specific list of item IDs.
     */
    protected function interfaceDataAction()
    {
        $itemIds = $this->postData['itemIds'] ?? [];
        if (empty($itemIds)) {
            self::returnJson([]);
            return;
        }
        $timeRange = $this->postData['timeRange'] ?? '24h';

        $time_from = strtotime('-' . str_replace(['m', 'h', 'd'], [' minutes', ' hours', ' days'], $timeRange));

        $params = [
            'itemids'   => $itemIds,
            'output'    => 'extend',
            'history'   => 3, // Numeric (unsigned)
            'sortfield' => 'clock',
            'sortorder' => 'ASC',
            'time_from' => $time_from,
        ];
        $history = $this->zabbix->zabbixRequest('history.get', $params)['result'] ?? [];

        $historyByItemId = [];
        foreach ($history as $point) {
            $historyByItemId[$point['itemid']][] = [
                'x' => intval($point['clock']) * 1000,
                'y' => round(floatval($point['value']) / 1000000, 2)
            ];
        }

        self::returnJson($historyByItemId);
    }

    /**
     * Gets general monitoring data (Uptime, Ping, Temp).
     */
    protected function generalDataAction() {
        $hostId = $this->request->hostId;

        $itemsToFetch = [
            'ping' => $this->zabbix->getICMPItems($hostId),
            'uptime' => $this->zabbix->getUptimeItems($hostId),
        ];

        $itemIds = [];
        $itemMap = [];
        foreach ($itemsToFetch as $type => $items) {
            if (!empty($items)) {
                foreach($items as $item) {
                    $itemIds[] = $item['itemid'];
                    $itemMap[$item['itemid']] = ['type' => $type, 'name' => $item['name'], 'units' => $item['units']];
                }
            }
        }

        $values = [];
        if(!empty($itemIds)) {
            $history = $this->zabbix->getItemValues($itemIds, 1);
            foreach($history as $h) {
                $info = $itemMap[$h['itemid']];
                $values[$info['type']][] = ['name' => $info['name'], 'value' => $h['value'], 'clock' => $h['clock'], 'units' => $info['units']];
            }
        }

        self::returnJson($values);
    }

    /**
     * Gets Zabbix problems (triggers) for the host.
     */
    protected function getProblemsAction() {
        $hostId = $this->request->hostId;
        $problems = $this->zabbix->zabbixRequest('problem.get', [
            'hostids' => $hostId,
            'output' => 'extend',
            'recent' => true, // Use boolean true
            'sortfield' => ['eventid'],
            'sortorder' => 'DESC'
        ])['result'] ?? [];

        self::returnJson($problems);
    }

    /**
     * Forces a Zabbix item check and returns the latest value for live graphs.
     */
    protected function liveDataAction() {
        $itemId = $this->request->itemId;
        if(empty($itemId)) {
            http_response_code(400);
            self::returnJson(['error' => 'Item ID is required.']);
            return;
        }

        $this->zabbix->createTask($itemId);
        sleep(3);
        $history = $this->zabbix->getItemValues([$itemId], 1);

        if(empty($history)) {
            self::returnJson(null);
            return;
        }

        $point = $history[0];
        $formattedPoint = [
            'x' => intval($point['clock']) * 1000,
            'y' => round(floatval($point['value']) / 1000000, 2)
        ];

        self::returnJson($formattedPoint);
    }

    /**
     * Renders a dedicated HTML page for the live graph popup.
     */
    public function liveGraphPageAction() {
        $this->layout(false);
        $this->layout()->set('API_BASE_URL', self::getUrl("DeviceMonitoring"));
        $this->layout()->setTemplate('Device/LiveGraph');
    }
}