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import Duration from "../duration.js";
function dayDiff(earlier, later) {
const utcDayStart = (dt) => dt.toUTC(0, { keepLocalTime: true }).startOf("day").valueOf(),
ms = utcDayStart(later) - utcDayStart(earlier);
return Math.floor(Duration.fromMillis(ms).as("days"));
}
function highOrderDiffs(cursor, later, units) {
const differs = [
["years", (a, b) => b.year - a.year],
["quarters", (a, b) => b.quarter - a.quarter + (b.year - a.year) * 4],
["months", (a, b) => b.month - a.month + (b.year - a.year) * 12],
[
"weeks",
(a, b) => {
const days = dayDiff(a, b);
return (days - (days % 7)) / 7;
},
],
["days", dayDiff],
];
const results = {};
const earlier = cursor;
let lowestOrder, highWater;
for (const [unit, differ] of differs) {
if (units.indexOf(unit) >= 0) {
lowestOrder = unit;
results[unit] = differ(cursor, later);
highWater = earlier.plus(results);
if (highWater > later) {
results[unit]--;
cursor = earlier.plus(results);
} else {
cursor = highWater;
}
}
}
return [cursor, results, highWater, lowestOrder];
}
export default function (earlier, later, units, opts) {
let [cursor, results, highWater, lowestOrder] = highOrderDiffs(earlier, later, units);
const remainingMillis = later - cursor;
const lowerOrderUnits = units.filter(
(u) => ["hours", "minutes", "seconds", "milliseconds"].indexOf(u) >= 0
);
if (lowerOrderUnits.length === 0) {
if (highWater < later) {
highWater = cursor.plus({ [lowestOrder]: 1 });
}
if (highWater !== cursor) {
results[lowestOrder] = (results[lowestOrder] || 0) + remainingMillis / (highWater - cursor);
}
}
const duration = Duration.fromObject(results, opts);
if (lowerOrderUnits.length > 0) {
return Duration.fromMillis(remainingMillis, opts)
.shiftTo(...lowerOrderUnits)
.plus(duration);
} else {
return duration;
}
}
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