<?php

class ZoraLinksError extends Exception
{
    public int $status;
    public string $errorCode;
    public array $payload;

    public function __construct(int $status, string $errorCode = 'request_error', string $message = '', array $payload = [])
    {
        parent::__construct($message !== '' ? $message : $errorCode);
        $this->status = $status;
        $this->errorCode = $errorCode;
        $this->payload = $payload;
    }
}

class ZoraLinks
{
    private string $apiKey;
    private string $baseUrl;
    private int $timeout;
    private ?string $caBundle;

    public function __construct(?string $apiKey = null, string $baseUrl = 'https://zoralinks.com/api/v1', int $timeout = 20, ?string $caBundle = null)
    {
        $apiKey = $apiKey ?: getenv('ZORALINKS_API_KEY');
        if (!$apiKey) {
            throw new InvalidArgumentException('ZoraLinks: falta apiKey o ZORALINKS_API_KEY');
        }
        $this->apiKey = $apiKey;
        $this->baseUrl = rtrim($baseUrl, '/');
        $this->timeout = $timeout;
        $this->caBundle = $caBundle ?: (getenv('ZORALINKS_CA_BUNDLE') ?: null);
    }

    private function request(string $method, string $path, array $params = [], ?array $body = null): array
    {
        $url = $this->baseUrl . $path;
        $clean = array_filter($params, static fn($value) => $value !== null && $value !== '');
        if ($clean) {
            $url .= '?' . http_build_query($clean);
        }

        $headers = [
            'Accept: application/json',
            'Authorization: Bearer ' . $this->apiKey,
            'User-Agent: ZoraLinks-PHP-SDK/1.0',
        ];
        $options = [
            CURLOPT_CUSTOMREQUEST => $method,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_TIMEOUT => $this->timeout,
        ];
        if ($this->caBundle) {
            $options[CURLOPT_CAINFO] = $this->caBundle;
        }
        if ($body !== null) {
            $headers[] = 'Content-Type: application/json';
            $options[CURLOPT_HTTPHEADER] = $headers;
            $options[CURLOPT_POSTFIELDS] = json_encode($body, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
        }

        $curl = curl_init($url);
        curl_setopt_array($curl, $options);
        $raw = curl_exec($curl);
        if ($raw === false) {
            $message = curl_error($curl);
            curl_close($curl);
            throw new ZoraLinksError(0, 'network_error', $message, []);
        }
        $status = (int) curl_getinfo($curl, CURLINFO_HTTP_CODE);
        curl_close($curl);

        $payload = json_decode($raw, true);
        if (!is_array($payload)) {
            $payload = ['error' => 'invalid_response', 'message' => substr((string) $raw, 0, 300)];
        }
        if ($status >= 400) {
            throw new ZoraLinksError(
                $status,
                (string) ($payload['error'] ?? 'request_error'),
                (string) ($payload['message'] ?? ''),
                $payload
            );
        }
        return $payload;
    }

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

    public function listLinks(int $limit = 50, int $offset = 0, ?string $status = null): array
    {
        return $this->request('GET', '/links', [
            'limit' => $limit,
            'offset' => $offset,
            'status' => $status,
        ]);
    }

    public function getLink(string $idOrAlias): array
    {
        return $this->request('GET', '/links/' . rawurlencode($idOrAlias));
    }

    public function createLink(string $alias, string $destination, ?string $title = null, int $steps = 3): array
    {
        return $this->request('POST', '/links', [], [
            'alias' => $alias,
            'destination' => $destination,
            'title' => $title,
            'steps' => $steps,
        ]);
    }

    public function updateLink(string $idOrAlias, array $data, string $method = 'PATCH'): array
    {
        return $this->request($method, '/links/' . rawurlencode($idOrAlias), [], $data);
    }

    public function deleteLink(string $idOrAlias): array
    {
        return $this->request('DELETE', '/links/' . rawurlencode($idOrAlias));
    }

    public function stats(string $period = 'all'): array
    {
        return $this->request('GET', '/stats', ['period' => $period]);
    }

    public function analytics(string $period = '30d'): array
    {
        return $this->request('GET', '/analytics', ['period' => $period]);
    }

    public function linkAnalytics(string $idOrAlias, string $period = '30d'): array
    {
        return $this->request('GET', '/links/' . rawurlencode($idOrAlias) . '/analytics', ['period' => $period]);
    }
}