<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST');
header('Access-Control-Allow-Headers: Content-Type');

$tickerFile = 'ticker-data.json';
$maxItems = 25; // Keep last 25 ticker items

// Read existing ticker data
function readTickerData($file) {
    if (!file_exists($file)) {
        return [];
    }
    $content = file_get_contents($file);
    return json_decode($content, true) ?: [];
}

// Write ticker data
function writeTickerData($file, $data) {
    return file_put_contents($file, json_encode($data, JSON_PRETTY_PRINT));
}

// Handle different HTTP methods
$method = $_SERVER['REQUEST_METHOD'];

if ($method === 'GET') {
    // Return current ticker data
    $tickerData = readTickerData($tickerFile);
    echo json_encode($tickerData);
    
} elseif ($method === 'POST') {
    // Add new ticker item
    $input = json_decode(file_get_contents('php://input'), true);
    
    if (!$input || !isset($input['text']) || !isset($input['type'])) {
        http_response_code(400);
        echo json_encode(['error' => 'Invalid input. Required: text, type']);
        exit;
    }
    
    $tickerData = readTickerData($tickerFile);
    
    // Add new item with timestamp
    $newItem = [
        'text' => $input['text'],
        'type' => $input['type'], // 'buy' or 'sell'
        'timestamp' => time()
    ];
    
    // Add optional SNS fields if provided
    if (isset($input['fullAddress'])) {
        $newItem['fullAddress'] = $input['fullAddress'];
    }
    if (isset($input['snsName'])) {
        $newItem['snsName'] = $input['snsName'];
    }
    
    // Add to beginning of array (most recent first)
    array_unshift($tickerData, $newItem);
    
    // Keep only the last N items
    if (count($tickerData) > $maxItems) {
        $tickerData = array_slice($tickerData, 0, $maxItems);
    }
    
    // Save to file
    if (writeTickerData($tickerFile, $tickerData)) {
        echo json_encode(['success' => true, 'itemsCount' => count($tickerData)]);
    } else {
        http_response_code(500);
        echo json_encode(['error' => 'Failed to save ticker data']);
    }
    
} else {
    http_response_code(405);
    echo json_encode(['error' => 'Method not allowed']);
}
?>