import { type as assertType } from "@heydovetail/assert";
import { Node, Schema } from "prosemirror-model";
import { Mapping, Step, StepMap, StepResult } from "prosemirror-transform";
import { RangeDeleteStep } from "./RangeDeleteStep";
import { Range } from "./types";

export interface RangeCreateJson {
  stepType: "range.create";
  range: Range;
}

export class RangeCreateStep extends Step {
  constructor(public readonly range: Readonly<Range>) {
    super();
  }

  public apply(doc: Node) {
    return StepResult.ok(doc);
  }

  public getMap() {
    return new StepMap([]);
  }

  public invert() {
    return new RangeDeleteStep(this.range);
  }

  public map(mapping: Mapping) {
    return new RangeCreateStep({
      ...this.range,
      from: mapping.map(this.range.from, 1),
      to: mapping.map(this.range.to, -1)
    });
  }

  public merge() {
    return null;
  }

  public toJSON(): RangeCreateJson {
    return {
      stepType: "range.create",
      range: this.range
    };
  }

  public static fromJSON(_: Schema, json: RangeCreateJson): RangeCreateStep {
    return new RangeCreateStep(json.range);
  }
}

Step.jsonID(assertType<RangeCreateJson["stepType"]>("range.create"), RangeCreateStep);