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import absFloor from '../utils/abs-floor';
import { cloneWithOffset } from '../units/offset';
import { normalizeUnits } from '../units/aliases';
export function diff (input, units, asFloat) {
var that,
zoneDelta,
delta, output;
if (!this.isValid()) {
return NaN;
}
that = cloneWithOffset(input, this);
if (!that.isValid()) {
return NaN;
}
zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;
units = normalizeUnits(units);
switch (units) {
case 'year': output = monthDiff(this, that) / 12; break;
case 'month': output = monthDiff(this, that); break;
case 'quarter': output = monthDiff(this, that) / 3; break;
case 'second': output = (this - that) / 1e3; break; // 1000
case 'minute': output = (this - that) / 6e4; break; // 1000 * 60
case 'hour': output = (this - that) / 36e5; break; // 1000 * 60 * 60
case 'day': output = (this - that - zoneDelta) / 864e5; break; // 1000 * 60 * 60 * 24, negate dst
case 'week': output = (this - that - zoneDelta) / 6048e5; break; // 1000 * 60 * 60 * 24 * 7, negate dst
default: output = this - that;
}
return asFloat ? output : absFloor(output);
}
function monthDiff (a, b) {
// difference in months
var wholeMonthDiff = ((b.year() - a.year()) * 12) + (b.month() - a.month()),
// b is in (anchor - 1 month, anchor + 1 month)
anchor = a.clone().add(wholeMonthDiff, 'months'),
anchor2, adjust;
if (b - anchor < 0) {
anchor2 = a.clone().add(wholeMonthDiff - 1, 'months');
// linear across the month
adjust = (b - anchor) / (anchor - anchor2);
} else {
anchor2 = a.clone().add(wholeMonthDiff + 1, 'months');
// linear across the month
adjust = (b - anchor) / (anchor2 - anchor);
}
//check for negative zero, return zero if negative zero
return -(wholeMonthDiff + adjust) || 0;
}
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