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import {create, path} from "d3";

import {filter} from "../defined.js";

import {Mark} from "../mark.js";

import {Curve} from "../curve.js";

import {applyChannelStyles, applyDirectStyles, applyIndirectStyles, applyTransform} from "../style.js";

const defaults = {

fill: "none",

stroke: "currentColor",

strokeMiterlimit: 1

};

export class Link extends Mark {

constructor(data, options = {}) {

const {x1, y1, x2, y2, curve} = options;

super(

data,

[

{name: "x1", value: x1, scale: "x"},

{name: "y1", value: y1, scale: "y"},

{name: "x2", value: x2, scale: "x", optional: true},

{name: "y2", value: y2, scale: "y", optional: true}

options,

defaults

);

this.curve = Curve(curve);

}

render(I, {x, y}, channels) {

const {x1: X1, y1: Y1, x2: X2 = X1, y2: Y2 = Y1} = channels;

const index = filter(I, X1, Y1, X2, Y2);

return create("svg:g")

.call(applyIndirectStyles, this)

.call(applyTransform, x, y, 0.5, 0.5)

.call(g => g.selectAll()

.data(index)

.join("path")

.call(applyDirectStyles, this)

.attr("d", i => {

const p = path();

const c = this.curve(p);

c.lineStart();

c.point(X1[i], Y1[i]);

c.point(X2[i], Y2[i]);

c.lineEnd();

return p + "";

})

.call(applyChannelStyles, channels))

.node();

}

export function link(data, {x, x1, x2, y, y1, y2, ...options} = {}) {

([x1, x2] = maybeSameValue(x, x1, x2));

([y1, y2] = maybeSameValue(y, y1, y2));

return new Link(data, {...options, x1, x2, y1, y2});

}

// If x1 and x2 are specified, return them as {x1, x2}.

// If x and x1 and specified, or x and x2 are specified, return them as {x1, x2}.

// If only x, x1, or x2 are specified, return it as {x1}.

function maybeSameValue(x, x1, x2) {

if (x === undefined) {

if (x1 === undefined) {

if (x2 !== undefined) return [x2];

} else {

if (x2 === undefined) return [x1];

}

} else if (x1 === undefined) {

return x2 === undefined ? [x] : [x, x2];

} else if (x2 === undefined) {

return [x, x1];

}

return [x1, x2];

}

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