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

interface RangeSetAttrsJson {
  stepType: "range.setAttrs";
  id: Range["id"];
  type: Range["type"];
  prev: Range["attrs"];
  curr: Range["attrs"];
}

export class RangeSetAttrsStep extends Step {
  constructor(public readonly id: Range["id"], public readonly type: Range["type"], public readonly prev: Range["attrs"], public readonly curr: Range["attrs"]) {
    super();
  }

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

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

  public invert() {
    return new RangeSetAttrsStep(this.id, this.type, this.curr, this.prev);
  }

  public map(_: Mapping) {
    return new RangeSetAttrsStep(this.id, this.type, this.prev, this.curr);
  }

  public merge() {
    return null;
  }

  public toJSON(): RangeSetAttrsJson {
    return {
      stepType: "range.setAttrs",
      id: this.id,
      type: this.type,
      prev: this.prev,
      curr: this.curr
    };
  }

  public static fromJSON(_: Schema, json: RangeSetAttrsJson): RangeSetAttrsStep {
    return new RangeSetAttrsStep(json.id, json.type, json.prev, json.curr);
  }
}

Step.jsonID(assertType<RangeSetAttrsJson["stepType"]>("range.setAttrs"), RangeSetAttrsStep);