<?php
function required_env($name) {
    $value = getenv($name);
    if (!$value) { throw new Exception("Set $name before running this example."); }
    return $value;
}

function request_json($method, $url, $payload = null, $token = null, $correlationId = null) {
    $ch = curl_init($url);
    $headers = ["Content-Type: application/json"];
    if ($token) { $headers[] = "Authorization: Bearer $token"; }
    if ($correlationId) { $headers[] = "X-Correlation-Id: $correlationId"; }
    curl_setopt_array($ch, [
        CURLOPT_CUSTOMREQUEST => $method,
        CURLOPT_HTTPHEADER => $headers,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 45
    ]);
    if ($payload !== null) { curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload)); }
    $body = curl_exec($ch);
    $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    if ($body === false || $status < 200 || $status >= 300) {
        throw new Exception("HTTP $status: " . ($body ?: curl_error($ch)));
    }
    curl_close($ch);
    return json_decode($body, true);
}

function values($fit, $demand, $margin, $cost, $risk, $customer) {
    return [
        "determine_trade_in_value_vehicle_fit_score" => $fit,
        "determine_trade_in_value_market_demand_score" => $demand,
        "determine_trade_in_value_gross_margin_potential" => $margin,
        "determine_trade_in_value_reconditioning_or_process_cost" => $cost,
        "determine_trade_in_value_compliance_risk_score" => $risk,
        "determine_trade_in_value_customer_value_score" => $customer
    ];
}

try {
    $identityUrl = getenv("DECISIOQ_IDENTITY_URL") ?: "https://identity.vinquery.com/connect/token";
    $catalogUrl = rtrim(getenv("DECISIOQ_DKS_URL") ?: "https://dks.vinquery.com", "/");
    $decisionServiceUrl = rtrim(getenv("DECISIOQ_DDE_URL") ?: "https://dde.vinquery.com", "/");
    $correlationId = "auto-ucd-008-php-" . bin2hex(random_bytes(8));

    $tokenResponse = request_json("POST", $identityUrl, [
        "clientId" => required_env("DECISIOQ_CLIENT_ID"),
    "clientSecret" => required_env("DECISIOQ_CLIENT_SECRET"),
        "audience" => getenv("DECISIOQ_AUDIENCE") ?: "vinquery:api:decisioq"
    ]);
    $token = $tokenResponse["jwtToken"];
    request_json("GET", "$catalogUrl/decisioncatalog/decisions/AUTO-UCD-008", null, $token, $correlationId);

    $result = request_json("POST", "$decisionServiceUrl/api/v1/decide", [
        "decisionId" => "AUTO-UCD-008",
        "profileId" => "balanced",
        "scenarioId" => "standard_retail",
        "algorithm" => "TOPSIS",
        "weightStrategy" => "Expert",
        "runSensitivity" => false,
        "requestContext" => ["correlationId" => $correlationId],
        "options" => [
            ["optionId" => "OPTION-001", "name" => "Retail Trade Option", "values" => values(86, 92, 3200, 900, 22, 84)],
            ["optionId" => "OPTION-002", "name" => "Wholesale Backup Option", "values" => values(78, 73, 4100, 1600, 35, 76)],
            ["optionId" => "OPTION-003", "name" => "Certified Retail Option", "values" => values(91, 85, 2300, 650, 18, 88)]
        ]
    ], $token, $correlationId);
    echo json_encode($result, JSON_PRETTY_PRINT) . PHP_EOL;
} catch (Exception $ex) {
    fwrite(STDERR, $ex->getMessage() . PHP_EOL);
    exit(1);
}
?>