<?php

namespace Modules\MarketingAddon\App\WhatsappGateways;

use Illuminate\Support\Facades\Http;

class WhatsAppCloudApi
{
    public static function send_message($gateway, $phone, $template, $name, $data)
    {
        $payload = [
            'messaging_product' => 'whatsapp',
            'recipient_type' => 'individual',
            'to' => $phone,
            'type' => 'template',
            'template' => [
                'name' => $template->template,
                'language' => [
                    'code' => $gateway->params['language_code'] ?? 'en_US',
                ],
            ],
        ];

        $components = self::buildComponents($template, $data);

        if (!empty($components)) {
            $payload['template']['components'] = $components;
        }

        $apiVersion = $gateway->params['api_version'] ?? 'v25.0';
        $phoneNumberId = $gateway->params['phone_number_id'];
        $url = "https://graph.facebook.com/{$apiVersion}/{$phoneNumberId}/messages";

        $response = Http::withToken($gateway->params['access_token'])
            ->withHeaders([
                'Content-Type' => 'application/json',
            ])
            ->post($url, $payload);

        if ($response->successful()) {
            return $response->json();
        }

        throw new \Exception(
            'WhatsApp Cloud API Error: ' . $response->body()
        );
    }

    protected static function buildComponents($template, array $data): array
    {
        $components = [];
        $header = self::buildHeader($template);
        $body = self::buildBody($template, $data);
        $button = self::buildButton($data['copy_text'] ?? null);

        if (!empty($header)) {
            $components[] = $header;
        }

        if (!empty($body)) {
            $components[] = $body;
        }

        if (!empty($button)) {
            $components[] = $button;
        }

        return $components;
    }

    protected static function buildBody($template, array $data): ?array
    {
        if (empty($template->variables) || !is_array($template->variables)) {
            return null;
        }

        $parameters = [];

        foreach ($template->variables as $variable) {
            if (in_array($variable, ['copy_text', 'expire_at'])) {
                continue;
            }

            if (!isset($data[$variable])) {
                continue;
            }

            $parameters[] = [
                'type' => 'text',
                'text' => (string) $data[$variable],
            ];
        }

        if (empty($parameters)) {
            return null;
        }

        return [
            'type' => 'body',
            'parameters' => $parameters,
        ];
    }

    protected static function buildHeader($template): ?array
    {
        if (empty($template?->attachment)) {
            return null;
        }

        $mediaType = self::mediaType($template->attachment);
        $media = ['link' => asset($template->attachment)];

        if ($mediaType === 'document') {
            $media['filename'] = basename($template->attachment);
        }

        return [
            'type' => 'header',
            'parameters' => [
                [
                    'type' => $mediaType,
                    $mediaType => $media,
                ],
            ],
        ];
    }

    protected static function buildButton(?string $copyText = null): ?array
    {
        if (!$copyText) {
            return null;
        }

        return [
            'type' => 'button',
            'sub_type' => 'url',
            'index' => 0,
            'parameters' => [
                [
                    'type' => 'text',
                    'text' => $copyText,
                ],
            ],
        ];
    }

    protected static function mediaType(string $attachment): string
    {
        $extension = strtolower(pathinfo($attachment, PATHINFO_EXTENSION));

        if (in_array($extension, ['jpg', 'jpeg', 'png', 'webp'])) {
            return 'image';
        }

        if (in_array($extension, ['mp4', '3gp'])) {
            return 'video';
        }

        return 'document';
    }
}