<?php

class TimeTrackingAPI
{
    private string $baseUrl;
    private string $token;
    private string $apiSite;

    public function __construct(string $baseUrl, string $token, string $apiSite = '')
    {
        $this->baseUrl = rtrim($baseUrl, '/');
        $this->token = $token;
        $this->apiSite = trim($apiSite, '/');
    }

    private function request(string $method, string $endpoint, array $headers = [], ?array $body = null): array
    {
        $url = "{$this->baseUrl}/{$this->apiSite}/{$endpoint}";
        $ch = curl_init($url);

        $defaultHeaders = [
            "Authorization: {$this->token}",
        ];
        if ($body !== null) {
            $defaultHeaders[] = 'Content-Type: application/json';
            $body = json_encode($body);
        }

        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CUSTOMREQUEST => strtoupper($method),
            CURLOPT_HTTPHEADER => array_merge($defaultHeaders, $headers),
            CURLOPT_POSTFIELDS => $body,
        ]);

        $response = curl_exec($ch);
        if (curl_errno($ch)) {
            throw new RuntimeException('cURL Error: ' . curl_error($ch));
        }

        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        $data = json_decode($response, true);
        if ($httpCode >= 400) {
            throw new RuntimeException("API request failed with status $httpCode: " . ($data['Message'] ?? $response));
        }

        return $data;
    }

    public function getExportDefinitions(): array
    {
        return $this->request('GET', 'api/export/');
    }

    public function getOrganizationUnits(): array
    {
        return $this->request('GET', 'api/organization/');
    }

    public function requestExport(string $exportDefinitionId, string $organizationUnitId, string $dateFrom, string $dateUntil): string
    {
        $body = [
            'ExportDefinition' => $exportDefinitionId,
            'organizationUnit' => $organizationUnitId,
            'DateFrom' => $dateFrom,
            'DateUntil' => $dateUntil,
        ];
        $response = $this->request('POST', 'api/export', [], $body);
        return $response['Result'] ?? throw new RuntimeException('Unexpected response: ' . json_encode($response));
    }

    public function getExportData(string $guid): array|string
    {
            $url = "api/export/{$guid}";

        $response = $this->rawRequest('GET', $url);

        // Versuche, JSON zu dekodieren
        $decoded = json_decode($response, true);

        if (json_last_error() === JSON_ERROR_NONE) {
            return $decoded;
        }

        // Kein JSON – gib den Rohinhalt zurück (CSV, Text etc.)
        return $response;
    }
}