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import {range as sequence} from "d3-array";
import {initRange} from "./init.js";
import ordinal from "./ordinal.js";
export default function band() {
var scale = ordinal().unknown(undefined),
domain = scale.domain,
ordinalRange = scale.range,
r0 = 0,
r1 = 1,
step,
bandwidth,
round = false,
paddingInner = 0,
paddingOuter = 0,
align = 0.5;
delete scale.unknown;
function rescale() {
var n = domain().length,
reverse = r1 < r0,
start = reverse ? r1 : r0,
stop = reverse ? r0 : r1;
step = (stop - start) / Math.max(1, n - paddingInner + paddingOuter * 2);
if (round) step = Math.floor(step);
start += (stop - start - step * (n - paddingInner)) * align;
bandwidth = step * (1 - paddingInner);
if (round) start = Math.round(start), bandwidth = Math.round(bandwidth);
var values = sequence(n).map(function(i) { return start + step * i; });
return ordinalRange(reverse ? values.reverse() : values);
}
scale.domain = function(_) {
return arguments.length ? (domain(_), rescale()) : domain();
};
scale.range = function(_) {
return arguments.length ? ([r0, r1] = _, r0 = +r0, r1 = +r1, rescale()) : [r0, r1];
};
scale.rangeRound = function(_) {
return [r0, r1] = _, r0 = +r0, r1 = +r1, round = true, rescale();
};
scale.bandwidth = function() {
return bandwidth;
};
scale.step = function() {
return step;
};
scale.round = function(_) {
return arguments.length ? (round = !!_, rescale()) : round;
};
scale.padding = function(_) {
return arguments.length ? (paddingInner = Math.min(1, paddingOuter = +_), rescale()) : paddingInner;
};
scale.paddingInner = function(_) {
return arguments.length ? (paddingInner = Math.min(1, _), rescale()) : paddingInner;
};
scale.paddingOuter = function(_) {
return arguments.length ? (paddingOuter = +_, rescale()) : paddingOuter;
};
scale.align = function(_) {
return arguments.length ? (align = Math.max(0, Math.min(1, _)), rescale()) : align;
};
scale.copy = function() {
return band(domain(), [r0, r1])
.round(round)
.paddingInner(paddingInner)
.paddingOuter(paddingOuter)
.align(align);
};
return initRange.apply(rescale(), arguments);
}
function pointish(scale) {
var copy = scale.copy;
scale.padding = scale.paddingOuter;
delete scale.paddingInner;
delete scale.paddingOuter;
scale.copy = function() {
return pointish(copy());
};
return scale;
}
export function point() {
return pointish(band.apply(null, arguments).paddingInner(1));
}
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