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import {greatest, group, least} from "d3";

import {maybeZ, valueof} from "../mark.js";

import {basic} from "./basic.js";

export function selectFirst(options) {

return select(first, undefined, options);

}

export function selectLast(options) {

return select(last, undefined, options);

}

export function selectMinX(options = {}) {

const x = options.x;

if (x == null) throw new Error("missing channel: x");

return select(min, x, options);

}

export function selectMinY(options = {}) {

const y = options.y;

if (y == null) throw new Error("missing channel: y");

return select(min, y, options);

}

export function selectMaxX(options = {}) {

const x = options.x;

if (x == null) throw new Error("missing channel: x");

return select(max, x, options);

}

export function selectMaxY(options = {}) {

const y = options.y;

if (y == null) throw new Error("missing channel: y");

return select(max, y, options);

}

// TODO If the value (for some required channel) is undefined, scan forward?

function* first(I) {

yield I[0];

}

// TODO If the value (for some required channel) is undefined, scan backward?

function* last(I) {

yield I[I.length - 1];

}

function* min(I, X) {

yield least(I, i => X[i]);

}

function* max(I, X) {

yield greatest(I, i => X[i]);

}

function select(selectIndex, v, options) {

const z = maybeZ(options);

return basic(options, (data, facets) => {

const Z = valueof(data, z);

const V = valueof(data, v);

const selectFacets = [];

for (const facet of facets) {

const selectFacet = [];

for (const I of Z ? group(facet, i => Z[i]).values() : [facet]) {

for (const i of selectIndex(I, V)) {

selectFacet.push(i);

}

selectFacets.push(selectFacet);

}

return {data, facets: selectFacets};

});

}

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