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import {registry, position, radius} from "./scales/index.js";

import {ScaleDiverging, ScaleLinear, ScalePow, ScaleLog, ScaleSymlog} from "./scales/quantitative.js";

import {ScaleTime, ScaleUtc} from "./scales/temporal.js";

import {ScaleOrdinal, ScalePoint, ScaleBand} from "./scales/ordinal.js";

export function Scales(channels, {inset, round, nice, align, padding, ...options} = {}) {

const scales = {};

for (const key of registry.keys()) {

if (channels.has(key) || options[key]) {

const scale = Scale(key, channels.get(key), {

inset: key === "x" || key === "y" ? inset : undefined, // not for facet

round,

nice,

align,

padding,

...options[key]

});

if (scale) scales[key] = scale;

}

return scales;

}

// Mutates scale.range!

export function autoScaleRange({x, y, fx, fy}, dimensions) {

if (fx) autoScaleRangeX(fx, dimensions);

if (fy) autoScaleRangeY(fy, dimensions);

if (x) autoScaleRangeX(x, fx ? {width: fx.scale.bandwidth()} : dimensions);

if (y) autoScaleRangeY(y, fy ? {height: fy.scale.bandwidth()} : dimensions);

}

function autoScaleRangeX(scale, dimensions) {

if (scale.range === undefined) {

const {inset = 0} = scale;

const {width, marginLeft = 0, marginRight = 0} = dimensions;

scale.scale.range([marginLeft + inset, width - marginRight - inset]);

}

function autoScaleRangeY(scale, dimensions) {

if (scale.range === undefined) {

const {inset = 0} = scale;

const {height, marginTop = 0, marginBottom = 0} = dimensions;

const range = [height - marginBottom - inset, marginTop + inset];

if (scale.type === "ordinal") range.reverse();

scale.scale.range(range);

}

function Scale(key, channels = [], options = {}) {

switch (inferScaleType(key, channels, options)) {

case "diverging": return ScaleDiverging(key, channels, options);

case "categorical": case "ordinal": return ScaleOrdinal(key, channels, options);

case "cyclical": case "sequential": case "linear": return ScaleLinear(key, channels, options);

case "sqrt": return ScalePow(key, channels, {...options, exponent: 0.5});

case "pow": return ScalePow(key, channels, options);

case "log": return ScaleLog(key, channels, options);

case "symlog": return ScaleSymlog(key, channels, options);

case "utc": return ScaleUtc(key, channels, options);

case "time": return ScaleTime(key, channels, options);

case "point": return ScalePoint(key, channels, options);

case "band": return ScaleBand(key, channels, options);

case undefined: return;

default: throw new Error(`unknown scale type: ${options.type}`);

}

function inferScaleType(key, channels, {type, domain, range}) {

if (type !== undefined) {

for (const {type: t} of channels) {

if (t !== undefined && type !== t) {

throw new Error(`scale incompatible with channel: ${type} !== ${t}`);

}

return type;

}

if (registry.get(key) === radius) return "sqrt";

for (const {type} of channels) if (type !== undefined) return type;

if ((domain || range || []).length > 2) return inferOrdinalType(key);

if (domain !== undefined) {

type = inferScaleTypeFromValues(key, domain);

if (type !== undefined) return type;

}

channels = channels.filter(({value}) => value !== undefined);

if (!channels.length) return;

for (const {value} of channels) {

type = inferScaleTypeFromValues(key, value);

if (type !== undefined) return type;

}

return "linear";

}

function inferScaleTypeFromValues(key, values) {

for (const value of values) {

if (value == null) continue;

if (typeof value === "string") return inferOrdinalType(key);

if (typeof value === "boolean") return inferOrdinalType(key);

if (value instanceof Date) return "utc";

return "linear";

}

// Positional scales default to a point scale instead of an ordinal scale.

function inferOrdinalType(key) {

return registry.get(key) === position ? "point" : "ordinal";

}

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