<?php

namespace Services;

use Libs\Logger;

class UnipileClient
{
    private string $dsn;
    private string $apiKey;

    public function __construct()
    {
        $this->dsn = trim((string) ($_ENV['UNIPILE_DSN'] ?? ''));
        $this->apiKey = trim((string) ($_ENV['UNIPILE_API_KEY'] ?? ''));
    }

    public function isConfigured(): bool
    {
        return $this->dsn !== '' && $this->apiKey !== '';
    }

    public function createHostedAuthLink(array $payload): array
    {
        return $this->requestJson('POST', '/hosted/accounts/link', $payload);
    }

    public function sendTextMessage(string $chatId, string $text): array
    {
        return $this->requestMultipart('POST', '/chats/' . rawurlencode($chatId) . '/messages', ['text' => $text]);
    }

    public function apiUrl(): string
    {
        return $this->baseEndpoint();
    }

    private function requestJson(string $method, string $path, array $payload = []): array
    {
        return $this->request($method, $path, [
            'Content-Type: application/json',
        ], $payload === [] ? '' : json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES));
    }

    private function requestMultipart(string $method, string $path, array $payload): array
    {
        return $this->request($method, $path, [], $payload);
    }

    private function request(string $method, string $path, array $headers, $body): array
    {
        if (!$this->isConfigured()) {
            throw new \RuntimeException('Unipile is not configured.');
        }

        if (!function_exists('curl_init')) {
            throw new \RuntimeException('PHP cURL extension is required for Unipile requests.');
        }

        $url = $this->baseUrl() . $path;
        $requestHeaders = array_merge([
            'X-API-KEY: ' . $this->apiKey,
            'Accept: application/json',
        ], $headers);

        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, strtoupper($method));
        curl_setopt($ch, CURLOPT_HTTPHEADER, $requestHeaders);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);

        if ($body !== '' && $body !== []) {
            curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
        }

        $raw = curl_exec($ch);
        $error = curl_error($ch);
        $status = (int) curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($raw === false) {
            Logger::error('Unipile request failed', ['path' => $path, 'error' => $error]);
            throw new \RuntimeException('Unipile request failed.');
        }

        $decoded = json_decode((string) $raw, true);
        if (!is_array($decoded)) {
            $decoded = ['raw' => (string) $raw];
        }

        if ($status < 200 || $status >= 300) {
            Logger::warning('Unipile returned an error', ['path' => $path, 'status' => $status, 'response' => $decoded]);
            throw new \RuntimeException('Unipile returned HTTP ' . $status . '.');
        }

        return $decoded;
    }

    private function baseUrl(): string
    {
        return $this->baseEndpoint() . '/api/v1';
    }

    private function baseEndpoint(): string
    {
        $dsn = preg_replace('#^https?://#', '', $this->dsn) ?? $this->dsn;
        $dsn = rtrim($dsn, '/');
        $dsn = preg_replace('#/api/v1$#', '', $dsn) ?? $dsn;

        return 'https://' . $dsn;
    }
}