<?php

// Set default timezone
date_default_timezone_set('Europe/Berlin');

// Define currencies that should *not* be included in the list
$excludedCurrencies = ['bits', 'sats'];

// Fetch the previously stored data
$previousData = json_decode(file_get_contents("coingecko.json"), true);
$output = $previousData;

$currentTime = time();

// Check if five seconds have passed since the last update
if (($currentTime - $previousData['time']) >= 5) {
	// Fetch the available currencies from CoinGecko API
	$availableCurrencies = json_decode(file_get_contents("https://api.coingecko.com/api/v3/simple/supported_vs_currencies"), true);

	// Remove excluded currencies
	$availableCurrencies = array_diff($availableCurrencies, $excludedCurrencies);

	$currencies = array_map('strtoupper', $availableCurrencies);

	// Fetch the latest data from CoinGecko API
	$apiUrl = 'https://api.coingecko.com/api/v3/simple/price?ids=monero&vs_currencies=' . implode('%2C', array_map('strtolower', $currencies)) . '&include_market_cap=true&include_24hr_vol=true&include_24hr_change=true&include_last_updated_at=true';

	$ch = curl_init($apiUrl);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	$json = curl_exec($ch);

	if (curl_errno($ch)) {
		echo 'Curl error: ' . curl_error($ch);
		curl_close($ch);
		exit;
	}

	curl_close($ch);

	// Decode the fetched data
	$fetchedData = json_decode($json, true);
	$moneroData = $fetchedData['monero'];

	// Initialize new data array
	$newData = ['time' => $currentTime];

	// Update the data for each currency
	foreach ($currencies as $currency) {
		$currencyLower = strtolower($currency);
		if (isset($moneroData[$currencyLower])) {
			$newData[$currencyLower] = [
				'lastValue' => $moneroData[$currencyLower],
				'lastDate' => $currentTime
			];
		} else {
			$newData[$currencyLower] = [
				'lastValue' => $previousData[$currencyLower]['lastValue'] ?? null,
				'lastDate' => $previousData[$currencyLower]['lastDate'] ?? null
			];
		}
	}

	// Save the new data to JSON files
	file_put_contents("coingecko.json", json_encode($newData, JSON_PRETTY_PRINT));
	file_put_contents("coingecko-original.json", json_encode($moneroData, JSON_PRETTY_PRINT));

	$output = $newData;
}

// Output the data
header('Content-Type: application/json');
echo json_encode($newData, JSON_PRETTY_PRINT);