<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:DodoSSH.Client.Shell.ViewModels"
             xmlns:views="using:DodoSSH.Client.App.Views"
             x:Class="DodoSSH.Client.App.Views.HostDrawer"
             x:DataType="vm:VaultViewModel">

  <!--
    Everything about one thing: what the selected host is, the editor for it, or the editor for a group.

    ── THIS WAS HostSidebar, AND THE HOST LIST IS NOT IN IT ANY MORE. ───────────────────────────────────
    It used to be a 268-pixel column on the left holding a filter box, the list of every host, and the
    editor underneath. That column was doing two jobs at two-thirds size — choosing among forty machines,
    and editing one of them — and it did the first one badly enough that the second was the only reason to
    keep it narrow. The list is now a grid of cards filling the screen, so this control kept the half that
    is about one host and moved to the right, which is where the thing you selected belongs.

    Renamed with the job rather than kept as HostSidebar, unlike NavRail, which kept its name when it only
    changed width. This one changed what it holds, which side it is on, and whether it is there at all.

    ── EXACTLY ONE OF THE THREE PANELS IS SHOWING ───────────────────────────────────────────────────────
    Detail, host editor, group editor. They are exclusive by construction rather than by three flags that
    could disagree: IsShowingHostDetail is defined as "neither editor is open and something is selected",
    so no two of these can be true at once. The whole control collapses when none of them is — see
    IsDrawerOpen, which the hosts screen binds — rather than standing there empty, because an empty
    300-pixel column beside a grid is 300 pixels the grid could have had.

    Its data context is the VaultViewModel, so every binding here is a property of the vault. The hosts
    screen hands it over.

    Nothing in here may be laid over the terminal's rectangle: it is a column of the hosts screen, and the
    hosts screen is a sibling of the WebView. See MainWindow.axaml's occlusion rule.
  -->

  <Border Width="304" Background="{StaticResource Sidebar}"
          BorderBrush="{StaticResource Border}" BorderThickness="1,0,0,0">

    <!--
      ◆ IT SCROLLS AS A WHOLE, and the host editor no longer carries a MaxHeight of its own.

      The old column gave the editor 300 pixels and let the list above have the rest, so the editor had to
      be bounded separately. Here the drawer is the only thing in its column, so one ScrollViewer over all
      three panels is both simpler and more honest: whichever panel is up gets the whole height, and the
      one that overflows is the one that scrolls.

      The cost is the one the old note recorded and it has not changed: the layout harness skips anything
      with a ScrollViewer in its ancestry — see LayoutHarness.IsScrollable — so from here on it certifies
      that this pane fits the column rather than that every field inside it does. That is the true claim
      about a pane that scrolls, and the tag picker is why it has to scroll: its height is a chip per tag
      in the keychain, wrapped, so no fixed height holds it for somebody with fifteen.
    -->
    <ScrollViewer HorizontalScrollBarVisibility="Disabled">
      <Panel>

        <!-- ============ WHAT THIS HOST IS ============ -->
        <StackPanel Margin="16" Spacing="12" IsVisible="{Binding IsShowingHostDetail}">

          <StackPanel Orientation="Horizontal" Spacing="8">
            <Ellipse Classes="dot" Classes.live="{Binding SelectedHost.IsConnected}"
                     VerticalAlignment="Center" />
            <TextBlock Text="{Binding SelectedHost.Label}" FontSize="16" FontWeight="SemiBold"
                       Foreground="{StaticResource Text}" VerticalAlignment="Center"
                       TextTrimming="CharacterEllipsis" />
          </StackPanel>

          <SelectableTextBlock Classes="mono" Text="{Binding SelectedHost.Address}" FontSize="12"
                               Foreground="{StaticResource TextDim}" TextWrapping="Wrap" />

          <!--
            Which of the three ways this host authenticates, and where it came from. The note rather than
            the one-word Authentication the card shows: a host that inherits its group's key is the case
            where the word alone is misleading, and there is room for the sentence here.
          -->
          <TextBlock Classes="hint" FontSize="12" Text="{Binding SelectedHostAuthenticationNote}" />

          <!--
            The tags it wears, as the same chips the card draws. Repeated rather than shared with the card's
            template because the two are different shapes — the card wraps them under a two-line summary and
            this is a column 304 wide — and a shared template would have to be told which.
          -->
          <ItemsControl ItemsSource="{Binding SelectedHost.TagLabels}"
                        IsVisible="{Binding SelectedHost.HasTags}">
            <ItemsControl.ItemsPanel>
              <ItemsPanelTemplate><WrapPanel /></ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
              <DataTemplate x:DataType="x:String">
                <Border Classes="chip" Padding="6,1" Margin="0,0,4,4">
                  <TextBlock Text="{Binding}" FontSize="9.5" />
                </Border>
              </DataTemplate>
            </ItemsControl.ItemTemplate>
          </ItemsControl>

          <SelectableTextBlock Text="{Binding SelectedHost.Host.Notes}" FontSize="12"
                               Foreground="{StaticResource TextDim}" TextWrapping="Wrap"
                               IsVisible="{Binding SelectedHost.Host.Notes,
                                                   Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />

          <Border Height="1" Background="{StaticResource BorderSubtle}" Margin="0,2" />

          <!--
            Connecting, and the box a host that wants a typed password needs. A sentence in the box's place
            when it does not, because "nothing needs typing" and "something needs typing and the box has not
            appeared" look identical and only one of them is fine.

            It is here rather than in a bar across the top of the screen, which is where it used to be: the
            password belongs to the host, and a box at the top of a grid of forty machines is one whose
            subject you have to work out. That move is also what this arrangement is for — the bar had one
            row and had to fit the box, the tick, the note and CONNECT along it; a column has room to put
            the tick under the box it qualifies, which is where it reads as a property of the password
            rather than as a fourth control in a row.

            REMEMBER travels with the box and hides with it. It is the two-step chore the box's tooltip used
            to describe — add a password under Keychain, then bind the host to it — done from the one place
            that already has the password, and it takes effect only once the remote has accepted it.
          -->
          <TextBox Text="{Binding ConnectPassword}" PlaceholderText="password"
                   PasswordChar="•" HorizontalAlignment="Stretch"
                   IsVisible="{Binding SelectedHostAsksForAPassword}"
                   ToolTip.Tip="Typed each time unless REMEMBER is ticked, in which case it is saved to your keychain and bound to this host once the connection succeeds." />
          <CheckBox IsChecked="{Binding RemembersConnectPassword}"
                    IsVisible="{Binding SelectedHostAsksForAPassword}"
                    ToolTip.Tip="Saves this password to your keychain, bound to this host, so it is not asked for again. It syncs to your other machines, and only happens if the connection works.">
            <TextBlock Text="Remember this password" Classes="hint" FontSize="12" />
          </CheckBox>

          <StackPanel Orientation="Horizontal" Spacing="6" IsVisible="{Binding ShowsHostActions}">
            <Button Classes="accent" Content="CONNECT" Command="{Binding ConnectCommand}"
                    IsEnabled="{Binding !IsBusy}" />
            <Button Classes="ghost" Content="EDIT" Command="{Binding EditSelectedHostCommand}" />
            <Button Classes="ghost" Content="DELETE" Command="{Binding DeleteHostCommand}" />
          </StackPanel>

          <!--
            Swapped for the buttons rather than stacked under them, as it always was, so DELETE cannot be
            pressed again while its own question is on screen. See VaultViewModel.ShowsHostActions.
          -->
          <Border Padding="10" Background="{StaticResource DangerWash}" CornerRadius="6"
                  IsVisible="{Binding IsConfirmingHostDeletion}">
            <views:ConfirmDeleteCard />
          </Border>

          <TextBlock Classes="hint" FontSize="11" TextWrapping="Wrap"
                     Text="Double-clicking the card does the same as CONNECT. The terminal opens as a tab in the strip above and stays there while you look at anything else." />

        </StackPanel>

        <!-- ============ THE HOST EDITOR ============ -->
        <!--
          The editor doubles as the "add" form; there is no separate dialog.
        -->
        <StackPanel Margin="16" Spacing="6" IsVisible="{Binding IsEditing}">

          <TextBlock Classes="label" Text="HOST" Foreground="{StaticResource TextDim}" Margin="0,0,0,4" />

          <TextBox Text="{Binding EditorLabel}" PlaceholderText="name" />
          <TextBox Text="{Binding EditorHostname}" PlaceholderText="hostname or address" />
          <!--
            Both boxes are allowed to be empty, and empty means "take the group's" rather than "unset". The
            watermark is what the host will actually use if it is left that way, which is why it is bound
            rather than literal: it changes when the group picker below moves.
          -->
          <Grid ColumnDefinitions="*,8,*">
            <NumericUpDown Grid.Column="0" Value="{Binding EditorPort}" Minimum="1" Maximum="65535"
                           FormatString="0" ShowButtonSpinner="False"
                           PlaceholderText="{Binding EditorPortPlaceholder}" />
            <TextBox Grid.Column="2" Text="{Binding EditorUsername}"
                     PlaceholderText="{Binding EditorUsernamePlaceholder}" />
          </Grid>
          <TextBox Text="{Binding EditorNotes}" PlaceholderText="notes" AcceptsReturn="True"
                   Height="56" TextWrapping="Wrap" />
          <!--
            How this host authenticates: a typed password, one of the vault's keys, or one of its credentials.
            Part of the host rather than of the connection, so it follows the host to every machine; a host
            bound to something since deleted keeps a placeholder entry here, so that editing the port cannot
            quietly turn it back into a typed-password host.

            One control for all three, which is what makes "a key or a credential, never both" impossible to
            express rather than merely invalid. The qualifier beside each label is not decoration: a key called
            "deploy" and the deploy account's password are the ordinary case, and bare labels would offer two
            identical-looking entries that authenticate completely differently.
          -->
          <ComboBox ItemsSource="{Binding EditorAuthenticationChoices}"
                    SelectedItem="{Binding EditorSelectedAuthentication}"
                    HorizontalAlignment="Stretch">
            <ComboBox.ItemTemplate>
              <DataTemplate x:DataType="vm:AuthenticationChoice">
                <StackPanel Orientation="Horizontal" Spacing="6">
                  <TextBlock Text="{Binding Label}" />
                  <TextBlock Text="{Binding Qualifier}" Classes="hint" FontSize="11"
                             VerticalAlignment="Center"
                             IsVisible="{Binding Qualifier, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
                </StackPanel>
              </DataTemplate>
            </ComboBox.ItemTemplate>
          </ComboBox>
          <!--
            Which group this host is filed under. Inside the encrypted payload like everything else here, so
            the server learns nothing about how the estate is organised — and a group the vault no longer has
            keeps a placeholder entry, so that editing the port cannot quietly unfile the host.
          -->
          <ComboBox ItemsSource="{Binding EditorGroupChoices}"
                    SelectedItem="{Binding EditorSelectedGroup}"
                    HorizontalAlignment="Stretch">
            <ComboBox.ItemTemplate>
              <DataTemplate x:DataType="vm:GroupChoice">
                <TextBlock Text="{Binding Label}" />
              </DataTemplate>
            </ComboBox.ItemTemplate>
          </ComboBox>
          <!--
            The tags this host wears. Chips that toggle rather than a multi-select list, because a chip is
            what a tag looks like on the card in the grid — a list of names to tick would make the user
            match an entry to a chip they can already see.

            The box under them creates one and puts it on straight away. That is where a tag is usually
            wanted: while tagging a host and finding it does not exist yet. Unlike every other field here it
            writes to the keychain immediately, because a host can only name a tag that has an id — so
            cancelling this editor leaves the tag behind, which is honest rather than hidden. Renaming and
            deleting are on the keychain screen, where every other item kind is managed.
          -->
          <ItemsControl ItemsSource="{Binding EditorTagChoices}" IsVisible="{Binding HasTagChoices}"
                        Margin="0,4,0,0">
            <ItemsControl.ItemsPanel>
              <ItemsPanelTemplate><WrapPanel /></ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
              <DataTemplate x:DataType="vm:TagChoice">
                <!--
                  Worn is filled, unworn is outlined. One control per tag with two states rather than a
                  checkbox beside a label: the state and the name occupy the same object, so a row of them
                  reads as the host's tags rather than as a form about them.
                -->
                <Button Classes="chiptoggle" Classes.worn="{Binding IsWorn}" Margin="0,0,4,4"
                        Command="{Binding $parent[ItemsControl].((vm:VaultViewModel)DataContext).ToggleEditorTagCommand}"
                        CommandParameter="{Binding}">
                  <TextBlock Text="{Binding Label}" FontSize="10.5" />
                </Button>
              </DataTemplate>
            </ItemsControl.ItemTemplate>
          </ItemsControl>

          <Grid ColumnDefinitions="*,6,Auto">
            <TextBox Grid.Column="0" Text="{Binding EditorNewTag}" PlaceholderText="new tag">
              <TextBox.KeyBindings>
                <KeyBinding Gesture="Enter" Command="{Binding AddEditorTagCommand}" />
              </TextBox.KeyBindings>
            </TextBox>
            <Button Grid.Column="2" Classes="ghost" Content="ADD" Command="{Binding AddEditorTagCommand}" />
          </Grid>

          <CheckBox IsChecked="{Binding EditorRelayEnabled}"
                    Content="Connect through the server relay" />
          <!--
            Stated at the moment the decision is made, which is the only place it means anything. With
            relay off the server stores no address at all; with it on the server must be able to resolve
            the target, or it becomes an authenticated open proxy into the operator's network.
          -->
          <TextBlock Classes="hint" FontSize="11"
                     Text="The relay stores this host's address on the server in plain text. Everything else stays encrypted." />
          <StackPanel Orientation="Horizontal" Spacing="6">
            <Button Classes="accent" Content="SAVE" Command="{Binding SaveHostCommand}" />
            <Button Classes="ghost" Content="CANCEL" Command="{Binding CancelEditCommand}" />
          </StackPanel>
          <!--
            Withdrawing host key trust lives here, in the host's own settings, because a changed host key
            is refused outright with no way to continue past it — so a legitimately rebuilt server needs
            somewhere deliberate to be re-approved from, and that somewhere must not be the warning
            itself. It takes effect when clicked rather than on Save, and the status line says so; it is
            not a field of the host.
          -->
          <Button Classes="danger" Content="FORGET HOST KEY" HorizontalAlignment="Left"
                  Command="{Binding ForgetHostKeyCommand}"
                  IsVisible="{Binding CanForgetHostKey}"
                  ToolTip.Tip="Removes the pinned key for this host's address, so the next connection asks you to check its fingerprint again." />
        </StackPanel>

        <!-- ============ THE GROUP EDITOR ============ -->
        <!--
          Here rather than on the Keychain screen, because a group is not a secret — it is how this screen's
          grid is arranged, and the arranging belongs beside the thing arranged. Filing a host into one is
          done in the host's own editor above, for the same reason its key and its password are.

          One form for both adding and renaming; GroupSaveLabel is what says which of the two is about to
          happen. The four fields under the name are what the hosts inside inherit when they say nothing
          themselves; every one of them may be left empty, and empty means "lend nothing" rather than
          "unset". The parent picker leaves out this group and everything beneath it, so a cycle cannot be
          made here — which is a courtesy rather than the guarantee, because one assembled offline on two
          machines was never offered this list. See HostInheritance.
        -->
        <StackPanel Margin="16" Spacing="6" IsVisible="{Binding IsEditingGroup}">

          <TextBlock Classes="label" Text="GROUP" Foreground="{StaticResource TextDim}" Margin="0,0,0,4" />

          <TextBlock Classes="hint" FontSize="11" TextWrapping="Wrap"
                     Text="A heading for the grid, and the defaults every host under it inherits. Which group a host is in is part of the host, and stays encrypted." />

          <TextBox Text="{Binding GroupEditorLabel}" PlaceholderText="group name" />

          <ComboBox ItemsSource="{Binding GroupEditorParentChoices}"
                    SelectedItem="{Binding GroupEditorSelectedParent}"
                    HorizontalAlignment="Stretch">
            <ComboBox.ItemTemplate>
              <DataTemplate x:DataType="vm:GroupChoice">
                <TextBlock Text="{Binding Label}" />
              </DataTemplate>
            </ComboBox.ItemTemplate>
          </ComboBox>

          <Grid ColumnDefinitions="*,8,*">
            <NumericUpDown Grid.Column="0" Value="{Binding GroupEditorDefaultPort}" Minimum="1"
                           Maximum="65535" FormatString="0" ShowButtonSpinner="False"
                           PlaceholderText="default port" />
            <TextBox Grid.Column="2" Text="{Binding GroupEditorDefaultUsername}"
                     PlaceholderText="default username" />
          </Grid>

          <ComboBox ItemsSource="{Binding GroupEditorAuthenticationChoices}"
                    SelectedItem="{Binding GroupEditorSelectedAuthentication}"
                    HorizontalAlignment="Stretch">
            <ComboBox.ItemTemplate>
              <DataTemplate x:DataType="vm:AuthenticationChoice">
                <StackPanel Orientation="Horizontal" Spacing="6">
                  <TextBlock Text="{Binding Label}" />
                  <TextBlock Text="{Binding Qualifier}" Classes="hint" FontSize="11"
                             VerticalAlignment="Center"
                             IsVisible="{Binding Qualifier, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
                </StackPanel>
              </DataTemplate>
            </ComboBox.ItemTemplate>
          </ComboBox>

          <StackPanel Orientation="Horizontal" Spacing="6">
            <Button Classes="accent" Content="{Binding GroupSaveLabel}"
                    Command="{Binding SaveGroupCommand}" />
            <Button Classes="ghost" Content="CANCEL" Command="{Binding CancelGroupEditCommand}" />
          </StackPanel>

        </StackPanel>

      </Panel>
    </ScrollViewer>
  </Border>

</UserControl>
