import {IChainForkConfig} from "@lodestar/config";
import {Slot, ssz} from "@lodestar/types";
import {IDatabaseController, Bucket, Repository} from "@lodestar/db";
import {bytesToInt} from "@lodestar/utils";

/**
 * Slot to slot ranges that ensure that block range is fully backfilled
 *
 * If node starts backfilling at slots 1000, and backfills to 800, there will be an entry
 * 1000 -> 800
 *
 * When the node is backfilling if it starts at 1200 and backfills to 1000, it will find this sequence and,
 * jump directly to 800 and delete the key 1000.
 */
export class BackfilledRanges extends Repository<Slot, Slot> {
  constructor(config: IChainForkConfig, db: IDatabaseController<Uint8Array, Uint8Array>) {
    super(config, db, Bucket.backfilled_ranges, ssz.Slot);
  }

  decodeKey(data: Buffer): number {
    return bytesToInt((super.decodeKey(data) as unknown) as Uint8Array, "be");
  }

  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  getId(value: Slot): number {
    throw new Error("Cannot get the db key from slot");
  }
}