/*!
 * All material copyright ESRI, All Rights Reserved, unless otherwise specified.
 * See https://github.com/Esri/calcite-components/blob/master/LICENSE.md for details.
 * v1.0.0-beta.97
 */
import { proxyCustomElement, HTMLElement, forceUpdate, h } from '@stencil/core/internal/client/index.js';
import { g as guid } from './guid.js';
import { c as createObserver } from './observers.js';

/**
 * Calculate slope of the tangents
 * uses Steffen interpolation as it's monotonic
 * http://jrwalsh1.github.io/posts/interpolations/
 *
 * @param p0
 * @param p1
 * @param p2
 */
function slope(p0, p1, p2) {
  const dx = p1[0] - p0[0];
  const dx1 = p2[0] - p1[0];
  const dy = p1[1] - p0[1];
  const dy1 = p2[1] - p1[1];
  const m = dy / (dx || (dx1 < 0 && 0));
  const m1 = dy1 / (dx1 || (dx < 0 && 0));
  const p = (m * dx1 + m1 * dx) / (dx + dx1);
  return (Math.sign(m) + Math.sign(m1)) * Math.min(Math.abs(m), Math.abs(m1), 0.5 * Math.abs(p)) || 0;
}
/**
 * Calculate slope for just one tangent (single-sided)
 *
 * @param p0
 * @param p1
 * @param m
 */
function slopeSingle(p0, p1, m) {
  const dx = p1[0] - p0[0];
  const dy = p1[1] - p0[1];
  return dx ? ((3 * dy) / dx - m) / 2 : m;
}
/**
 * Given two points and their tangent slopes,
 * calculate the bezier handle coordinates and return draw command.
 *
 * Translates Hermite Spline to Beziér curve:
 * stackoverflow.com/questions/42574940/
 *
 * @param p0
 * @param p1
 * @param m0
 * @param m1
 * @param t
 */
function bezier(p0, p1, m0, m1, t) {
  const [x0, y0] = p0;
  const [x1, y1] = p1;
  const dx = (x1 - x0) / 3;
  const h1 = t([x0 + dx, y0 + dx * m0]).join(",");
  const h2 = t([x1 - dx, y1 - dx * m1]).join(",");
  const p = t([x1, y1]).join(",");
  return `C ${h1} ${h2} ${p}`;
}
/**
 * Generate a function which will translate a point
 * from the data coordinate space to svg viewbox oriented pixels
 *
 * @param root0
 * @param root0.width
 * @param root0.height
 * @param root0.min
 * @param root0.max
 */
function translate({ width, height, min, max }) {
  const rangeX = max[0] - min[0];
  const rangeY = max[1] - min[1];
  return (point) => {
    const x = ((point[0] - min[0]) / rangeX) * width;
    const y = height - (point[1] / rangeY) * height;
    return [x, y];
  };
}
/**
 * Get the min and max values from the dataset
 *
 * @param data
 */
function range(data) {
  const [startX, startY] = data[0];
  const min = [startX, startY];
  const max = [startX, startY];
  return data.reduce(({ min, max }, [x, y]) => ({
    min: [Math.min(min[0], x), Math.min(min[1], y)],
    max: [Math.max(max[0], x), Math.max(max[1], y)]
  }), { min, max });
}
/**
 * Generate drawing commands for an area graph
 * returns a string can can be passed directly to a path element's `d` attribute
 *
 * @param root0
 * @param root0.data
 * @param root0.min
 * @param root0.max
 * @param root0.t
 */
function area({ data, min, max, t }) {
  if (data.length === 0) {
    return "";
  }
  // important points for beginning and ending the path
  const [startX, startY] = t(data[0]);
  const [minX, minY] = t(min);
  const [maxX] = t(max);
  // keep track of previous slope/points
  let m;
  let p0;
  let p1;
  // iterate over data points, calculating command for each
  const commands = data.reduce((acc, point, i) => {
    p0 = data[i - 2];
    p1 = data[i - 1];
    if (i > 1) {
      const m1 = slope(p0, p1, point);
      const m0 = m === undefined ? slopeSingle(p0, p1, m1) : m;
      const command = bezier(p0, p1, m0, m1, t);
      m = m1;
      return `${acc} ${command}`;
    }
    return acc;
  }, `M ${minX},${minY} L ${minX},${startY} L ${startX},${startY}`);
  // close the path
  const last = data[data.length - 1];
  const end = bezier(p1, last, m, slopeSingle(p1, last, m), t);
  return `${commands} ${end} L ${maxX},${minY} Z`;
}

const graphCss = "@keyframes in{0%{opacity:0}100%{opacity:1}}@keyframes in-down{0%{opacity:0;transform:translate3D(0, -5px, 0)}100%{opacity:1;transform:translate3D(0, 0, 0)}}@keyframes in-up{0%{opacity:0;transform:translate3D(0, 5px, 0)}100%{opacity:1;transform:translate3D(0, 0, 0)}}@keyframes in-scale{0%{opacity:0;transform:scale3D(0.95, 0.95, 1)}100%{opacity:1;transform:scale3D(1, 1, 1)}}:root{--calcite-animation-timing:calc(150ms * var(--calcite-internal-duration-factor));--calcite-internal-duration-factor:var(--calcite-duration-factor, 1);--calcite-internal-animation-timing-fast:calc(100ms * var(--calcite-internal-duration-factor));--calcite-internal-animation-timing-medium:calc(200ms * var(--calcite-internal-duration-factor));--calcite-internal-animation-timing-slow:calc(300ms * var(--calcite-internal-duration-factor))}.calcite-animate{opacity:0;animation-fill-mode:both;animation-duration:var(--calcite-animation-timing)}.calcite-animate__in{animation-name:in}.calcite-animate__in-down{animation-name:in-down}.calcite-animate__in-up{animation-name:in-up}.calcite-animate__in-scale{animation-name:in-scale}@media (prefers-reduced-motion: reduce){:root{--calcite-internal-duration-factor:0.01}}:root{--calcite-floating-ui-transition:var(--calcite-animation-timing)}:host([hidden]){display:none}:host{display:block;block-size:100%}.svg{fill:currentColor;stroke:transparent;margin:0px;display:block;block-size:100%;inline-size:100%;padding:0px}.svg .graph-path--highlight{fill:var(--calcite-ui-brand);opacity:0.5}";

const Graph = /*@__PURE__*/ proxyCustomElement(class extends HTMLElement {
  constructor() {
    super();
    this.__registerHost();
    this.__attachShadow();
    //--------------------------------------------------------------------------
    //
    //  Properties
    //
    //--------------------------------------------------------------------------
    /**
     * Array of tuples describing a single data point ([x, y])
     * These data points should be sorted by x-axis value
     */
    this.data = [];
    //--------------------------------------------------------------------------
    //
    //  Private State/Props
    //
    //--------------------------------------------------------------------------
    this.graphId = `calcite-graph-${guid()}`;
    this.resizeObserver = createObserver("resize", () => forceUpdate(this));
  }
  //--------------------------------------------------------------------------
  //
  //  Lifecycle
  //
  //--------------------------------------------------------------------------
  connectedCallback() {
    var _a;
    (_a = this.resizeObserver) === null || _a === void 0 ? void 0 : _a.observe(this.el);
  }
  disconnectedCallback() {
    var _a;
    (_a = this.resizeObserver) === null || _a === void 0 ? void 0 : _a.disconnect();
  }
  render() {
    const { data, colorStops, el, highlightMax, highlightMin, min, max } = this;
    const id = this.graphId;
    const { clientHeight: height, clientWidth: width } = el;
    // if we have no data, return empty svg
    if (!data || data.length === 0) {
      return (h("svg", { class: "svg", height: height, preserveAspectRatio: "none", viewBox: `0 0 ${width} ${height}`, width: width }));
    }
    const { min: rangeMin, max: rangeMax } = range(data);
    let currentMin = rangeMin;
    let currentMax = rangeMax;
    if (min < rangeMin[0] || min > rangeMin[0]) {
      currentMin = [min, 0];
    }
    if (max > rangeMax[0] || max < rangeMax[0]) {
      currentMax = [max, rangeMax[1]];
    }
    const t = translate({ min: currentMin, max: currentMax, width, height });
    const [hMinX] = t([highlightMin, currentMax[1]]);
    const [hMaxX] = t([highlightMax, currentMax[1]]);
    const areaPath = area({ data, min: rangeMin, max: rangeMax, t });
    const fill = colorStops ? `url(#linear-gradient-${id})` : undefined;
    return (h("svg", { class: "svg", height: height, preserveAspectRatio: "none", viewBox: `0 0 ${width} ${height}`, width: width }, colorStops ? (h("defs", null, h("linearGradient", { id: `linear-gradient-${id}`, x1: "0", x2: "1", y1: "0", y2: "0" }, colorStops.map(({ offset, color, opacity }) => (h("stop", { offset: `${offset * 100}%`, "stop-color": color, "stop-opacity": opacity })))))) : null, highlightMin !== undefined ? ([
      h("mask", { height: "100%", id: `${id}1`, width: "100%", x: "0%", y: "0%" }, h("path", { d: `
            M 0,0
            L ${hMinX - 1},0
            L ${hMinX - 1},${height}
            L 0,${height}
            Z
          `, fill: "white" })),
      h("mask", { height: "100%", id: `${id}2`, width: "100%", x: "0%", y: "0%" }, h("path", { d: `
            M ${hMinX + 1},0
            L ${hMaxX - 1},0
            L ${hMaxX - 1},${height}
            L ${hMinX + 1}, ${height}
            Z
          `, fill: "white" })),
      h("mask", { height: "100%", id: `${id}3`, width: "100%", x: "0%", y: "0%" }, h("path", { d: `
                M ${hMaxX + 1},0
                L ${width},0
                L ${width},${height}
                L ${hMaxX + 1}, ${height}
                Z
              `, fill: "white" })),
      h("path", { class: "graph-path", d: areaPath, fill: fill, mask: `url(#${id}1)` }),
      h("path", { class: "graph-path--highlight", d: areaPath, fill: fill, mask: `url(#${id}2)` }),
      h("path", { class: "graph-path", d: areaPath, fill: fill, mask: `url(#${id}3)` })
    ]) : (h("path", { class: "graph-path", d: areaPath, fill: fill }))));
  }
  get el() { return this; }
  static get style() { return graphCss; }
}, [1, "calcite-graph", {
    "data": [16],
    "colorStops": [16],
    "highlightMin": [2, "highlight-min"],
    "highlightMax": [2, "highlight-max"],
    "min": [514],
    "max": [514]
  }]);
function defineCustomElement() {
  if (typeof customElements === "undefined") {
    return;
  }
  const components = ["calcite-graph"];
  components.forEach(tagName => { switch (tagName) {
    case "calcite-graph":
      if (!customElements.get(tagName)) {
        customElements.define(tagName, Graph);
      }
      break;
  } });
}
defineCustomElement();

export { Graph as G, defineCustomElement as d };