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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>fib.html</title>
<style>
#sequence {
overflow-wrap: break-word;
}
</style>
</head>
<body>
<a id="next">Next Term</a>
<a href=".">Reset</a>
<hr/>
<code id="sequence"></code>
<script>
const s = new URLSearchParams(window.location.search).get("s") ?? "0,1";
const i1 = s.lastIndexOf(",");
const i2 = s.lastIndexOf(",", i1 - 1);
const n1 = s.substring(i1 + 1);
const n2 = i2 === -1 ? s.substring(0, i1 - 1) : s.substring(i2 + 1, i1);
const v = Number(n1) + Number(n2);
const output = `${s},${Number(n1) + Number(n2)}`;
document.getElementById("sequence").innerText = output;
const next = document.getElementById("next");
if (v > Number.MAX_SAFE_INTEGER) {
next.remove();
alert(`Sorry the term is past max safe integer (${Number.MAX_SAFE_INTEGER}), can't calculate.`);
} else {
next.href = `${window.location.pathname}?s=${output}`
}
</script>
</body>
</html>
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