import SwiftUI

class Settings: ObservableObject {
  #if DEBUG
    @AppStorage("detailViewType")
    var detailViewType: BooruPostFileType = .sample
  #else
    @AppStorage("detailViewType")
    var detailViewType: BooruPostFileType = .original
  #endif

  @AppStorage("thumbnailType")
  var thumbnailType: BooruPostFileType = .preview

  @AppStorage("searchSuggestions")
  var searchSuggestions: Bool = false

  @AppStorage("columns")
  var columns: Int = 2

  @AppStorage("blurNSFWThumbnails")
  var blurNSFWThumbnails: Bool = true

  @AppStorage("showNSFWPosts")
  var showNSFWPosts: Bool = false

  @AppStorage("bookmarks")
  private var bookmarksData: Data = .init()

  @AppStorage("preferredBooru")
  var preferredBooru: BooruProvider = .yandere

  @AppStorage("enableShareShortcut")
  var enableShareShortcut: Bool = false

  @AppStorage("displayRatings")
  private var displayRatingsData: Data = Settings.initialiseRatingsData()

  @AppStorage("blurRatings")
  private var blurRatingsData: Data = Settings.initialiseRatingsData()

  var bookmarks: [Bookmark] {
    get {
      if let bookmarks = try? JSONDecoder().decode([Bookmark].self, from: bookmarksData) {
        return bookmarks
      }

      return []
    }

    set {
      if let data = try? JSONEncoder().encode(newValue) {
        bookmarksData = data
      }
    }
  }

  var displayRatings: [BooruRating] {
    get { Self.decodeRatings(from: displayRatingsData) }
    set { if let data = Self.encodeRatings(newValue) { displayRatingsData = data } }
  }

  var blurRatings: [BooruRating] {
    get { Self.decodeRatings(from: blurRatingsData) }
    set { if let data = Self.encodeRatings(newValue) { blurRatingsData = data } }
  }

  private static func initialiseRatingsData() -> Data {
    do {
      return try JSONEncoder().encode(BooruRating.allCases)
    } catch {
      return Data()
    }
  }

  private static func decodeRatings(from data: Data) -> [BooruRating] {
    if let ratings = try? JSONDecoder().decode([BooruRating].self, from: data) {
      return ratings
    }

    return BooruRating.allCases
  }

  private static func encodeRatings(_ ratings: [BooruRating]) -> Data? {
    try? JSONEncoder().encode(ratings)
  }

  func resetToDefaults() {
    #if DEBUG
      detailViewType = .preview
    #else
      detailViewType = .original
    #endif
    thumbnailType = .preview
    searchSuggestions = false
    columns = 2
    blurNSFWThumbnails = true
    showNSFWPosts = false
  }

  func addBookmark(provider: BooruProvider, tags: [String]) {
    var currentBookmarks = bookmarks

    currentBookmarks.append(Bookmark(provider: provider, tags: tags.map { $0.lowercased() }))

    bookmarks = currentBookmarks
  }

  func removeBookmark(at index: IndexSet) {
    var currentBookmarks = bookmarks

    currentBookmarks.remove(atOffsets: index)

    bookmarks = currentBookmarks
  }

  func removeBookmark(withTags tags: [String]) {
    var currentBookmarks = bookmarks

    currentBookmarks.removeAll { bookmark in
      bookmark.tags.contains(where: tags.contains)
    }

    bookmarks = currentBookmarks
  }

  func removeBookmark(withID: UUID) {
    var currentBookmarks = bookmarks

    currentBookmarks.removeAll { bookmark in
      bookmark.id == withID
    }

    bookmarks = currentBookmarks
  }
}