import type { UndoOperation, UndoStackEntry } from '../../shared/undo'
import { UndoStackRepository } from '../db/repositories/undo.repo'
import type { SqliteDb } from '../db/types'

export class UndoStackService {
  constructor(private db: SqliteDb) {}

  push(chapterId: string, operation: UndoOperation): UndoStackEntry {
    return new UndoStackRepository(this.db).push(chapterId, operation)
  }

  list(chapterId: string): UndoStackEntry[] {
    return new UndoStackRepository(this.db).list(chapterId)
  }

  apply(entryId: number): UndoOperation | null {
    const entry = new UndoStackRepository(this.db).get(entryId)
    return entry?.operation ?? null
  }
}