legend-of-mana-calculator/main.js

(() => {
	const level_cap = 99;

	// @todo: verify that initial stats are indeed 1 across the board
	const initial_stats = {
		"Level": 1,
		"Pw": 5,
		"Sk": 5,
		"Df": 5,
		"Mg": 5,
		"Hp": 5,
		"Sp": 5,
		"Ch": 5,
	};

	const weapon_tables = {
		"Swords": {"Pw": 1, "Sk": 1, "Df": 1, "Mg": .75, "Hp": .75, "Sp": .75, "Ch": .75},
		"2H Swords": {"Pw": 1.25, "Sk": 1, "Df": .5, "Mg": .75, "Hp": .75, "Sp": .5, "Ch": .75},
		"Knives": {"Pw": .75, "Sk": 1.25, "Df": .75, "Mg": .75, "Hp": .5, "Sp": 1, "Ch": 1},
		"Axes": {"Pw": 1, "Sk": .75, "Df": 1, "Mg": .75, "Hp": .75, "Sp": 1, "Ch": .5},
		"2H Axes": {"Pw": 1.25, "Sk": 1.25, "Df": .75, "Mg": .75, "Hp": .5, "Sp": .75, "Ch": .5},
		"Staves": {"Pw": .5, "Sk": .75, "Df": .75, "Mg": 1.25, "Hp": .5, "Sp": .75, "Ch": 1.25},
		"Bows": {"Pw": .5, "Sk": 1.75, "Df": .75, "Mg": .75, "Hp": .5, "Sp": .75, "Ch": 1},
		"Spears": {"Pw": .75, "Sk": 1.25, "Df": 1, "Mg": .75, "Hp": .5, "Sp": .75, "Ch": 1},
		"Flails": {"Pw": .75, "Sk": 1.25, "Df": .5, "Mg": .75, "Hp": .5, "Sp": .75, "Ch": 1.25},
		"Hammers": {"Pw": 1.75, "Sk": .75, "Df": .5, "Mg": .75, "Hp": .75, "Sp": .75, "Ch": .75},
		"Gloves": {"Pw": 1.25, "Sk": .75, "Df": .75, "Mg": .5, "Hp": 1, "Sp": .75, "Ch": .75},
	};

	const decimals = document.forms[0]["Decimals"];

	const outputs = {
		"Level":  document.forms[0]["Level"],
		"Pw": document.forms[0]["Pw"],
		"Sk": document.forms[0]["Sk"],
		"Df": document.forms[0]["Df"],
		"Mg": document.forms[0]["Mg"],
		"Hp": document.forms[0]["Hp"],
		"Sp": document.forms[0]["Sp"],
		"Ch": document.forms[0]["Ch"],
	};

	const inputs = {
		"Swords": document.forms[1]["Swords"],
		"2H Swords": document.forms[1]["2H Swords"],
		"Knives": document.forms[1]["Knives"],
		"Axes": document.forms[1]["Axes"],
		"2H Axes": document.forms[1]["2H Axes"],
		"Staves": document.forms[1]["Staves"],
		"Bows": document.forms[1]["Bows"],
		"Spears": document.forms[1]["Spears"],
		"Flails": document.forms[1]["Flails"],
		"Hammers": document.forms[1]["Hammers"],
		"Gloves": document.forms[1]["Gloves"],
	};

	const preflight_check = function() {
		let level = 0;
		for (const key in inputs) {
			if (inputs[key].value == "") {
				inputs[key].value = 0;
			}
			if (!Number.isInteger(inputs[key].value)) {
				inputs[key].value = Math.trunc(inputs[key].value);
			}
			level += Number.parseInt(inputs[key].value);
		}
		if (level > (level_cap - 1)) {
			document.activeElement.value = Number.parseInt(document.activeElement.value) + ((level_cap - 1) - level);
		}
	};

	const recalculating = function() {
		preflight_check();

		for (const key in outputs) {
			outputs[key].value = initial_stats[key];
		}

		for (const key in inputs) {
			const tally = Number.parseInt(inputs[key].value);
			if (tally > 0) {
				outputs["Level"].value = Number(outputs["Level"].value) + tally;
				for (const attribute in weapon_tables[key]) {
					outputs[attribute].value = Number(outputs[attribute].value) + (tally * weapon_tables[key][attribute]);
				}
			}
		}

		if (decimals.checked) {
			for (const key in outputs) {
				outputs[key].value = Math.trunc(outputs[key].value);
			}
		}
	};

	for (const key in inputs) {
		inputs[key].oninput = recalculating;
	}
	decimals.onchange = recalculating;

	recalculating();
})();