<?php
header('Content-Type: application/json');

// --- Configuration ---
// Default to BTCUSDT if no symbol is provided in the URL query string.
$symbol = isset($_GET['symbol']) ? strtoupper($_GET['symbol']) : 'BTCUSDT';
$api_url = "https://api.bitget.com/api/v2/spot/market/tickers?symbol=" . $symbol;

// --- cURL Execution ---
$ch = curl_init();
curl_setopt_array($ch, [
    CURLOPT_URL => $api_url,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_TIMEOUT => 10,
    CURLOPT_HTTPHEADER => [
        'Accept: application/json'
    ],
    // It's good practice to set a user-agent
    CURLOPT_USERAGENT => 'FlatlogicMarketDetector/1.0'
]);

$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$error = curl_error($ch);
curl_close($ch);

// --- Response Handling ---
if ($error) {
    http_response_code(500);
    echo json_encode(['error' => 'cURL Error: ' . $error]);
    exit;
}

if ($http_code !== 200) {
    http_response_code($http_code);
    echo json_encode(['error' => 'Bitget API returned non-200 status', 'details' => json_decode($response)]);
    exit;
}

$data = json_decode($response, true);

// --- Data Validation & Output ---
if (json_last_error() !== JSON_ERROR_NONE || empty($data['data'])) {
    http_response_code(500);
    echo json_encode(['error' => 'Failed to parse JSON response or data is empty']);
    exit;
}

// Extract the first ticker object from the response data array
$ticker_data = $data['data'][0] ?? null;

if (!$ticker_data) {
    http_response_code(404);
    echo json_encode(['error' => 'Ticker data for symbol not found in API response']);
    exit;
}

// --- Log to Database ---
try {
    require_once __DIR__ . '/../db/config.php';
    $price_to_log = $ticker_data['lastPr'] ?? null;
    if ($price_to_log) {
        $pdo = db();
        $stmt = $pdo->prepare(
            "INSERT INTO price_history (symbol, price) VALUES (:symbol, :price)"
        );
        $stmt->execute(['symbol' => $symbol, 'price' => $price_to_log]);
    }
} catch (Exception $e) {
    // If DB fails, log error but don't crash the API endpoint
    error_log('DB logging failed in ticker.php: ' . $e->getMessage());
}

// --- Sanitize and Structure Output ---
// We select and sanitize the fields we want to send to the frontend.
$output = [
    'exchange' => 'Bitget',
    'symbol' => $ticker_data['symbol'] ?? 'N/A',
    'price' => $ticker_data['lastPr'] ?? '0.00',
    // Bitget provides the 24h change as a decimal, e.g., 0.025 for +2.5%
    'change_24h_percent' => isset($ticker_data['priceChangePercent']) ? (float)$ticker_data['priceChangePercent'] * 100 : 0,
    'signal' => '-' // Placeholder for future signal detection
];

echo json_encode($output);