@using Management.Web.Shared.Components
@using Management.Web.Shared.Components.Forms
@using CanvasModel.Assignments

@inject CoursePlanner planner
@inject CanvasService canvas
@inject NavigationManager Navigation
@inject AssignmentEditorContext assignmentContext

@code {
  protected override void OnInitialized()
  {
    assignmentContext.StateHasChanged += reload;
    reload();
  }
  private void reload()
  {
    if (assignmentContext.Assignment != null)
    {
      name = assignmentContext.Assignment.Name;
    }
    this.InvokeAsync(this.StateHasChanged);
  }
  public void Dispose()
  {
    assignmentContext.StateHasChanged -= reload;
  }

  private void OnHide()
  {
    assignmentContext.Assignment = null;
    name = "";
  }
  private string name { get; set; } = String.Empty;
  private bool addingAssignmentToCanvas = false;
  private bool deletingAssignmentFromCanvas = false;
  private bool showHelp = false;

  private void toggleHelp() => showHelp = !showHelp;

  private void submitHandler()
  {
    if (assignmentContext.Assignment != null)
    {
      var newAssignment = assignmentContext.Assignment with
        {
          Name = name,
        };

      assignmentContext.SaveAssignment(newAssignment);
    }
    assignmentContext.Assignment = null;
  }

  private async Task HandleDelete()
  {
    if (planner.LocalCourse != null && assignmentContext.Assignment != null)
    {
      var assignment = assignmentContext.Assignment;

      var currentModule = planner
        .LocalCourse
        .Modules
        .First(m =>
          m.Assignments.Contains(assignment)
        ) ?? throw new Exception("handling assignment delete, could not find module");

      var newModules = planner.LocalCourse.Modules.Select(m =>
          m.Name == currentModule.Name
            ? m with
              {
                Assignments = m.Assignments.Where(a => a != assignment).ToArray()
              }
            : m
        )
        .ToArray();

      planner.LocalCourse = planner.LocalCourse with
      {
        Modules = newModules
      };

      if (assignmentInCanvas != null && planner.LocalCourse.Settings.CanvasId != null)
      {
        ulong courseId = planner.LocalCourse.Settings.CanvasId ?? throw new Exception("cannot delete if no course id");
        await canvas.Assignments.Delete(courseId, assignmentInCanvas.Id, assignment.Name);
      }
      Navigation.NavigateTo("/course/" + planner.LocalCourse?.Settings.Name);
    }
  }

  private void handleNameChange(ChangeEventArgs e)
  {
    if (assignmentContext.Assignment != null)
    {
      var newAssignment = assignmentContext.Assignment with { Name = e.Value?.ToString() ?? "" };
      assignmentContext.SaveAssignment(newAssignment);
    }
  }

  private void setAssignmentGroup(LocalAssignmentGroup? group)
  {
    if (assignmentContext.Assignment == null)
      return;

    var newAssignment = assignmentContext.Assignment with
      {
        LocalAssignmentGroupName = group?.Name
      };

    assignmentContext.SaveAssignment(newAssignment);
  }

  private LocalAssignmentGroup? selectedAssignmentGroup =>
    planner
    .LocalCourse?
    .Settings
    .AssignmentGroups
    .FirstOrDefault(g => g.Name == assignmentContext.Assignment?.LocalAssignmentGroupName);

  private async Task addToCanvas()
  {
    addingAssignmentToCanvas = true;
    await assignmentContext.AddAssignmentToCanvas();
    await planner.LoadCanvasData();
    addingAssignmentToCanvas = false;
  }
  private async Task updateInCanvas()
  {
    if(assignmentInCanvas != null)
    {
      addingAssignmentToCanvas = true;
      await assignmentContext.UpdateInCanvas(assignmentInCanvas.Id);
      await planner.LoadCanvasData();
      addingAssignmentToCanvas = false;
    }
  }

  private CanvasAssignment? assignmentInCanvas =>
    planner.CanvasAssignments?.FirstOrDefault(a => a.Name == assignmentContext.Assignment?.Name);

  private string canvasAssignmentUrl =>
    $"https://snow.instructure.com/courses/{planner.LocalCourse?.Settings.CanvasId}/assignments/{assignmentInCanvas?.Id}";

  private async Task deleteFromCanvas()
  {
    if (assignmentInCanvas == null 
      || planner?.LocalCourse?.Settings.CanvasId == null 
      || assignmentContext.Assignment == null
    )
      return;
      
    deletingAssignmentFromCanvas = true;
    await canvas.Assignments.Delete(
      (ulong)planner.LocalCourse.Settings.CanvasId, 
      assignmentInCanvas.Id,
      assignmentContext.Assignment.Name
    );
    await planner.LoadCanvasData();
    deletingAssignmentFromCanvas = false;
    StateHasChanged();
  }
}

<div class="d-flex flex-column p-2 h-100  w-100" style="height: 100%;" >
  <div>
    @assignmentContext.Assignment?.Name
  </div>

  <section class="flex-grow-1 p-1 border rounded-4 bg-dark-subtle" style="min-height: 0;">
    @if (assignmentContext.Assignment != null)
    {
      <AssignmentMarkdownEditor ShowHelp=@showHelp />
    }
  </section>

  <div class="d-flex justify-content-end  p-3">
    @if (addingAssignmentToCanvas || deletingAssignmentFromCanvas)
    {
      <div>
        <Spinner />
      </div>
    }

    <button class="btn btn-outline-secondary mx-3" @onclick=toggleHelp>
      Toggle Help
    </button>
    <ConfirmationModal Label="Delete" Class="btn btn-danger" OnConfirmAsync="HandleDelete" />
    <button 
      class="btn btn-outline-secondary mx-3" 
      disabled="@(addingAssignmentToCanvas || deletingAssignmentFromCanvas)"
      @onclick="addToCanvas"
    >
      Add To Canvas
    </button>
    @if (assignmentInCanvas != null)
    {
      <a 
        class="btn btn-outline-secondary me-1" 
        href="@canvasAssignmentUrl" 
        target="_blank"
        disabled="@(addingAssignmentToCanvas || deletingAssignmentFromCanvas)"
      >
        View in Canvas
      </a>
      <button 
        class="btn btn-outline-secondary mx-3" 
        disabled="@(addingAssignmentToCanvas || deletingAssignmentFromCanvas)"
        @onclick="updateInCanvas"
      >
        Update In Canvas
      </button>
      <ConfirmationModal 
        Disabled="@(addingAssignmentToCanvas || deletingAssignmentFromCanvas)"
        Label="Delete from Canvas" 
        Class="btn btn-outline-danger mx-3" 
        OnConfirmAsync="deleteFromCanvas" 
      />
    }
    <button class="btn btn-primary mx-2" @onclick="@(() => {
        assignmentContext.Assignment = null;
        Navigation.NavigateTo("/course/" + planner.LocalCourse?.Settings.Name);
      })">
      Done
    </button>
  </div>

  
</div>