import type { Commit } from "./commit";

export class RegularGraphRows<TNode> {
  protected rows = new Map<Commit["hash"], number>();

  private maxRowCache: number | undefined = undefined;

  public constructor(commits: Array<Commit<TNode>>) {
    this.computeRowsFromCommits(commits);
  }

  public getRowOf(commitHash: Commit["hash"]): number {
    return this.rows.get(commitHash) || 0;
  }

  public getMaxRow(): number {
    // if (this.maxRowCache === undefined) {
    //   this.maxRowCache = uniq(Array.from(this.rows.values())).length - 1;
    // }
    return this.maxRowCache;
  }

  protected computeRowsFromCommits(commits: Array<Commit<TNode>>): void {
    commits.forEach((commit, i) => {
      this.rows.set(commit.hash, i);
    });
    this.maxRowCache = commits.length - 1;

  }
}

/**
 * Creates a duplicate-free version of an array.
 *
 * Don't use lodash's `uniq` as it increased bundlesize a lot for such a
 * simple function.
 * => The way we bundle for browser seems not to work with `lodash-es`.
 * => I didn't to get tree-shaking to work with `lodash` (the CommonJS version).
 *
 * @param array Array of values
 */
// function uniq<T>(array: T[]): T[] {
//   const set = new Set<T>();
//   array.forEach((value) => set.add(value));
//   return Array.from(set);
// }