// Copyright (c) 2022 Razeware LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
// distribute, sublicense, create a derivative work, and/or sell copies of the
// Software in any work that is designed, intended, or marketed for pedagogical or
// instructional purposes related to programming, coding, application development,
// or information technology.  Permission for such use, copying, modification,
// merger, publication, distribution, sublicensing, creation of derivative works,
// or sale is expressly withheld.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// THE SOFTWARE.

import Combine
import class Foundation.DispatchQueue
import GRDB

enum PersistenceStoreError: Error {
  case argumentError
  case notFound
}

// The object responsible for managing and accessing cached content
final class PersistenceStore: ObservableObject {
  let db: DatabaseWriter
  let workerQueue = DispatchQueue(label: "com.razeware.emitron.persistence", qos: .background)
  
  init(db: DatabaseWriter) {
    self.db = db
  }
}

extension PersistenceStore {
  /// Completely erase the database. Used for logout.
  func erase() throws {
    // Empty it
    try db.erase()
    // Repopulate the structure
    try EmitronDatabase.migrator.migrate(db)
  }
}
