<?php

$clientID="94351d4d-4909-4056-ad9d-8052a332d6b9";
$clientSecret="bf665590-2519-49af-8d1f-7cd0dce1dc7a";

//CONTINENTAL CAPITAL
$clientID="9ff18a6d-331e-4ec5-9ecc-4e512e13747c";
$clientSecret="40f44254-10e7-4eb8-b161-38125117f4ba";

$authURL="https://openapiuat.airtel.africa/auth/oauth2/token";
$res=authenticate($authURL, $clientID, $clientSecret);

if($res['success']){
	$bearerToken=$res['token'];
	$country = "MW";  
	$currency = "MWK";
	//enquire trans status
	$res=getAirtelBalance($country, $currency, $bearerToken); 
	
	
	if ($res["status"] === "SUCCESS") {
		echo "Balance: {$res['balance']} {$res['currency']}\n";
		echo "Account Status: {$res['account_status']}";
	} else {
		echo "Error: " . $res["message"];
	}
	
	
}else{
	echo(print_r($res,true));
	exit();
}


function getAirtelBalance($country, $currency, $token) {
    $url = "https://openapiuat.airtel.africa/standard/v1/users/balance";

    // Initialize cURL
    $curl = curl_init();

    curl_setopt_array($curl, [
        CURLOPT_URL => $url,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => "",
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 30,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => "GET",
        CURLOPT_HTTPHEADER => [
            "Accept: application/json",
            "X-Country: $country",
            "X-Currency: $currency",
            "Authorization: Bearer $token"
        ],
    ]);

    $response = curl_exec($curl);
	
	if (curl_errno($curl)) {
        $error = curl_error($curl);
        curl_close($curl);
        return [
            "status"  => "ERROR",
            "message" => "cURL Error: $error"
        ];
    }

    curl_close($curl);

    // Decode response
    $result = json_decode($response, true);

    // Handle invalid JSON
    if (!$result) {
        return [
            "status"  => "ERROR",
            "message" => "Invalid JSON response from Airtel API"
        ];
    }

    // Check for API structure
    if (!isset($result["status"])) {
        return [
            "status"  => "ERROR",
            "message" => "Unexpected API response format".print_r($result,true)
        ];
    }

    $statusCode = $result["status"]["code"] ?? null;
    $message    = $result["status"]["message"] ?? "Unknown error";

    // ✅ SUCCESS case
    if ($statusCode == "200" && isset($result["data"])) {
        return [
            "status"         => "SUCCESS",
            "balance"        => $result["data"]["balance"] ?? "0",
            "currency"       => $result["data"]["currency"] ?? $currency,
            "account_status" => $result["data"]["account_status"] ?? "Unknown"
        ];
    }

    // ❌ ERROR case (e.g. "User not found", "Invalid token", etc.)
    return [
        "status"       => "ERROR",
        "message"      => $message,
        "code"         => $statusCode,
        "responseCode" => $result["status"]["response_code"] ?? null,
        "resultCode"   => $result["status"]["result_code"] ?? null
    ];
}

function authenticate($baseURL, $wallet, $password)
{
    // JSON payload
    $postData = json_encode([
        'client_id' => $wallet,
        'client_secret' => $password,
		'grant_type' => "client_credentials"
    ]);

    // Initialize cURL
    $ch = curl_init($baseURL);

    // Set cURL options
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return the response
    curl_setopt($ch, CURLOPT_POST, true);           // Use POST method
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);// Set the request body
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Content-Type: application/json',
        'Content-Length: ' . strlen($postData)
    ]);

    // Execute the request
    $response = curl_exec($ch);

    // Check for cURL errors
    if (curl_errno($ch)) {
        curl_close($ch);
        return [
            'success' => false,
            'error' => 'Curl error: ' . curl_error($ch)
        ];
    }

    // Get HTTP status code
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    // Decode JSON response
    $result = json_decode($response, true);

    // Check if token is present
    if ($httpCode === 200 && isset($result['access_token'])) {
        return [
            'success' => true,
            'token' => $result['access_token']
        ];
    } else {
        return [
            'success' => false,
            'error' => $result['error_description'] ?? 'Unknown error',
            'details' => $result['error'] ?? []
        ];
    }
}


?>