/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
import { useState, useContext } from "react";
import h from "../hyper";
import { NoteLayoutContext, NoteRect } from "./layout";
import { ModelEditorContext } from "../context";
import { NoteEditorContext } from "./editor";
import { HeightRangeAnnotation } from "./height-range";
import NoteDefs from "./defs";

const getHeights = function (position, tolerance = 0.1) {
  let { startHeight, dragHeight, ...rest } = position;
  if (dragHeight == null) {
    dragHeight = startHeight;
  }
  let rng = [startHeight, dragHeight];
  rng.sort();
  let [height, top_height] = rng;
  if (top_height - height < tolerance) {
    top_height = null;
  }
  return { height, top_height, ...rest };
};

const HeightRange = function (props) {
  let { position, tolerance } = props;
  if (!position) {
    return null;
  }
  if (tolerance == null) {
    tolerance = 0.1;
  }
  const val = getHeights(position, tolerance);
  return h(HeightRangeAnnotation, val);
};

const NewNotePositioner = function (props) {
  const { paddingLeft, scale } = useContext(NoteLayoutContext);
  const { onCreateNote } = useContext(NoteEditorContext) as any;
  if (onCreateNote == null) {
    return null;
  }
  const { tolerance } = props;
  const [notePosition, setPosition] = useState(null);
  const { model } = useContext(ModelEditorContext);
  if (model != null) {
    return null;
  }

  const eventHeight = (evt) => scale.invert(evt.nativeEvent.offsetY);

  return h("g.new-note", [
    h(NoteDefs, { fill: "dodgerblue", size: 4, prefix: "new_" }),
    h(NoteRect, {
      width: paddingLeft,
      fill: "transparent",
      padding: 0,
      style: { cursor: "drag" },
      onMouseDown(evt) {
        if (notePosition != null) {
          return;
        }
        return setPosition({
          startHeight: eventHeight(evt),
          offsetX: evt.nativeEvent.offsetX,
        });
      },
      onMouseMove(evt) {
        if (notePosition == null) {
          return;
        }
        return setPosition({
          ...notePosition,
          dragHeight: eventHeight(evt),
        });
      },

      onMouseUp(evt) {
        const dragHeight = eventHeight(evt);
        const finalPos = getHeights({ ...notePosition, dragHeight });
        setPosition(null);
        return onCreateNote(finalPos);
      },
    }),
    h(HeightRange, { position: notePosition }),
  ]);
};

NewNotePositioner.defaultProps = {
  tolerance: 0.1,
};

export { NewNotePositioner };