import RastrilloApple
import DocsKit
import SwiftUI

/// Each window owns its navigation and model lifetime. Switching an account in
/// one window must never discard another window's unconfirmed edits.
struct DocsAccountWindow: View {
  @StateObject private var connection = NativeConnection(defaultServer: "https://docs.oficina.works")
  #if os(macOS)
  @Bindable var windows: DocsWindows
  @Environment(\.openWindow) private var openWindow
  #endif
  private func transport(for account: String?) -> @MainActor () -> NativeTransport? {
    let connection = connection
    return DocsAccountTransport.supplier(account: account,
                                         active: { [weak connection] in connection?.activeAccountID },
                                         client: { [weak connection] in connection?.client })
  }

  var body: some View {
    Group {
      if let client = connection.client {
        #if os(macOS)
        if let account = connection.activeAccountID {
        DocsWorkspace(client: client, accountID: account, transport: transport(for: account), accounts: connection.showAccounts, signOut: {
          guard connection.activeAccountID == account, windows.canSignOut(account) else { return }
          windows.entries.removeAll { $0.account == account }
          connection.signOut()
        }, createDocument: {
          guard connection.activeAccountID == account else { return }
          let id = windows.reserveDraft(account: account, client: client)
          openWindow(id: "document", value: id)
        }, canSignOut: windows.canSignOut(account), createRequested: $windows.createRequested, accountsRequested: $windows.accountsRequested, openDocument: { document, title in
          guard connection.activeAccountID == account else { return }
          let id = windows.reserve(account: account, document: document, title: title, client: client)
          openWindow(id: "document", value: id)
        }, updateRecents: { documents in
          guard connection.activeAccountID == account else { return }
          windows.updateRecents(documents, account: account, client: client)
        })
          .id(account)
        }
        #else
        DocsWorkspace(client: client, accountID: connection.activeAccountID, transport: transport(for: connection.activeAccountID), accounts: connection.showAccounts, signOut: connection.signOut)
          .id(connection.activeAccountID)
        #endif
      } else {
        NativeAccountsView("Oficina Docs", systemImage: "doc.text", connection: connection)
      }
    }.onOpenURL(perform: connection.handleOpenURL)
    #if os(macOS)
    .onChange(of: windows.accountsRequested, initial: true) { _, requested in
      if requested && connection.client == nil { windows.accountsRequested = false }
    }
    .focusedSceneValue(\.docsWindowAccount, connection.activeAccountID)
    .onChange(of: connection.activeAccountID, initial: true) { _, value in windows.activeAccount = value }
    #endif
  }
}