<?php
// /sms/wa_client.php
declare(strict_types=1);

namespace Sms;

final class WaClient
{
    private string $phoneId;
    private string $token;
    private int    $timeout;

    public function __construct(array $cfg)
    {
        $this->phoneId = $cfg['phone_number_id'] ?? '';
        $this->token   = $cfg['access_token']    ?? '';
        $this->timeout = (int)($cfg['timeout']   ?? 20);

        if ($this->phoneId === '' || $this->token === '') {
            throw new \RuntimeException('Config WhatsApp incomplète: phone_number_id / access_token manquants.');
        }
    }

    /** Normalise en format international chiffres-only (WhatsApp: pas de "+") */
    public static function normalizePhone(string $raw): string
    {
        $n = preg_replace('/\D+/', '', $raw ?? '');
        // Ex: numéro FR commençant par 0 -> remplace 0 initial par 33
        if (preg_match('/^0\d{9}$/', $n)) {
            $n = '33' . substr($n, 1);
        }
        return $n;
    }

    /**
     * Envoi d’un template Utility.
     * $templateName: ex. 'notification_rdv'
     * $lang: 'ru' (ou celui déclaré/validé chez Meta)
     * $to: numéro destinataire (06..., +33..., 336..., etc.)
     * $bodyParams: tableau des valeurs pour {{1}}, {{2}}, ...
     */
    public function sendTemplate(string $templateName, string $lang, string $to, array $bodyParams, ?array $buttonUrlParams = null): array
{
    $toNorm = self::normalizePhone($to);
    if ($toNorm === '' || strlen($toNorm) < 8) {
        throw new \InvalidArgumentException('Numéro destinataire invalide.');
    }

    // BODY params
    $components = [[
        'type'       => 'body',
        'parameters' => array_map(fn($t) => ['type'=>'text','text'=>(string)$t], $bodyParams)
    ]];

    // BUTTON URL params (facultatif)
    // $buttonUrlParams attendu sous la forme: ['0' => ['123']]  // index "0" => [ valeurs pour {{1}}, {{2}} si existait ]
    if ($buttonUrlParams) {
        foreach ($buttonUrlParams as $index => $values) {
            $params = array_map(fn($t) => ['type'=>'text','text'=>(string)$t], (array)$values);
            $components[] = [
                'type'       => 'button',
                'sub_type'   => 'url',
                'index'      => (string)$index,
                'parameters' => $params,
            ];
        }
    }

    $payload = [
        'messaging_product' => 'whatsapp',
        'to'                => $toNorm,
        'type'              => 'template',
        'template'          => [
            'name'       => $templateName,
            'language'   => ['code' => $lang],
            'components' => $components,
        ]
    ];

    $json = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

    $ch = curl_init("https://graph.facebook.com/v23.0/{$this->phoneId}/messages");
    curl_setopt_array($ch, [
        CURLOPT_HTTPHEADER => [
            "Authorization: Bearer {$this->token}",
            "Content-Type: application/json",
            "Accept: application/json",
            "Expect:",
            "Connection: close",
        ],
        CURLOPT_POST           => true,
        CURLOPT_POSTFIELDS     => $json,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT        => $this->timeout,
        CURLOPT_HTTP_VERSION   => CURL_HTTP_VERSION_1_1,
        CURLOPT_SSL_VERIFYPEER => true,
        CURLOPT_SSL_VERIFYHOST => 2,
    ]);

    $resp = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $err  = curl_error($ch);
    curl_close($ch);

    $data = json_decode($resp ?? '', true);

    return [
        'http_code' => $code,
        'error'     => $err ?: null,
        'response'  => $data ?? $resp,
        'payload'   => $payload,
    ];
}

}