<?php
require_once __DIR__ . '/../db/config.php';

class WablasService {
    public static function sendMessage($to, $message) {
        $pdo = db();
        $settings = $pdo->query("SELECT setting_key, setting_value FROM settings WHERE setting_key LIKE 'wablas_%'")->fetchAll(PDO::FETCH_KEY_PAIR);
        
        $token = $settings['wablas_api_token'] ?? '';
        $serverUrl = $settings['wablas_server_url'] ?? '';
        $securityKey = $settings['wablas_security_key'] ?? '';

        if (empty($token) || empty($serverUrl)) {
            error_log("Wablas settings missing.");
            return ['success' => false, 'error' => 'Settings missing'];
        }

        // Clean phone number (remove +, spaces, etc)
        $to = preg_replace('/[^0-9]/', '', $to);
        
        // Add 968 prefix if missing and it's an 8-digit Omani number
        if (strlen($to) === 8) {
            $to = '968' . $to;
        }
        
        // Prepare data
        $data = [
            'phone' => $to,
            'message' => $message,
        ];
        
        // Add security key if provided (using both common keys to ensure compatibility)
        if (!empty($securityKey)) {
            $data['security_key'] = $securityKey;
            $data['secret_key'] = $securityKey;
        }

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_HTTPHEADER, array("Authorization: $token"));
        curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));
        curl_setopt($curl, CURLOPT_URL, rtrim($serverUrl, '/') . "/api/send-message");
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        
        $result = curl_exec($curl);
        $error = curl_error($curl);
        curl_close($curl);

        if ($error) {
            error_log("Wablas CURL error: " . $error);
            return ['success' => false, 'error' => $error];
        }

        $response = json_decode($result, true);
        if (isset($response['status']) && $response['status'] == true) {
            return ['success' => true, 'data' => $response];
        }

        error_log("Wablas API error: " . $result);
        return ['success' => false, 'error' => $result];
    }

    public static function sendThankYou($donation) {
        $name = !empty($donation['donor_name']) ? $donation['donor_name'] : 'Donor';
        $amount = number_format($donation['amount'], 3);
        
        // Fetch case title
        $pdo = db();
        $stmt = $pdo->prepare("SELECT title_en FROM cases WHERE id = ?");
        $stmt->execute([$donation['case_id']]);
        $case = $stmt->fetch();
        $caseTitle = $case ? $case['title_en'] : 'a cause';

        $message = "Dear $name,\n\nThank you for your generous donation of OMR $amount to \"$caseTitle\".\n\nYour support makes a real difference! ❤️\n\nCharityHub Team";
        
        if (!empty($donation['donor_phone'])) {
            return self::sendMessage($donation['donor_phone'], $message);
        }
        
        return ['success' => false, 'error' => 'No phone number provided'];
    }

    public static function sendGiftNotification($donation) {
        if (empty($donation['is_gift']) || empty($donation['gift_recipient_phone'])) {
            return ['success' => false, 'error' => 'Not a gift or no recipient phone'];
        }

        $donorName = !empty($donation['donor_name']) ? $donation['donor_name'] : 'A generous donor';
        $recipientName = !empty($donation['gift_recipient_name']) ? $donation['gift_recipient_name'] : 'Friend';
        $giftMessage = !empty($donation['gift_message']) ? "\n\nMessage: \"" . $donation['gift_message'] . "\"" : "";
        
        // Fetch case title
        $pdo = db();
        $stmt = $pdo->prepare("SELECT title_en FROM cases WHERE id = ?");
        $stmt->execute([$donation['case_id']]);
        $case = $stmt->fetch();
        $caseTitle = $case ? $case['title_en'] : 'a charitable cause';

        $message = "Hello $recipientName! ✨\n\n$donorName has made a donation to \"$caseTitle\" in your name as a special gift.$giftMessage\n\nMay this kindness bring joy to your day! ❤️\n\nCharityHub Team";
        
        return self::sendMessage($donation['gift_recipient_phone'], $message);
    }
}