@using Management.Web.Shared.Components
@using Management.Web.Shared.Components.AssignmentForm
@using Management.Web.Shared.Components.Forms

@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;
      lockAtDueDate = assignmentContext.Assignment.LockAtDueDate;
    }
    this.InvokeAsync(this.StateHasChanged);
  }
  public void Dispose()
  {
    assignmentContext.StateHasChanged -= reload;
  }

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

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

      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
          .Select(a => a.Id)
          .Contains(assignment.Id)
        ) ?? 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.Id != assignment.Id).ToArray()
          }
        : m
      ).ToArray();

      planner.LocalCourse = planner.LocalCourse with
      {
        Modules = newModules
      };
      if (assignment.CanvasId != null && planner.LocalCourse.CanvasId != null)
      {
        ulong courseId = planner.LocalCourse.CanvasId ?? throw new Exception("cannot delete if no course id");
        await canvas.Assignments.Delete(courseId, assignment);
      }
    }
  }

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

  private void handleLockAtDueDateChange(ChangeEventArgs e)
  {
    if (assignmentContext.Assignment != null)
    {
      var lockAtDueDate = (bool)(e.Value ?? false);
      var lockAtDate = lockAtDueDate
        ? assignmentContext.Assignment.DueAt
        : assignmentContext.Assignment.LockAt;
      var newAssignment = assignmentContext.Assignment with { 
        LockAtDueDate = lockAtDueDate,
        LockAt = lockAtDate,
      };
      assignmentContext.SaveAssignment(newAssignment);
    }
  }

  private void setAssignmentGroup(LocalAssignmentGroup group)
  {
    if(assignmentContext.Assignment == null)
      return;
    
    var newAssignment = assignmentContext.Assignment with 
    {
      LocalAssignmentGroupId = group.Id
    };

    assignmentContext.SaveAssignment(newAssignment);
  }

  private LocalAssignmentGroup? selectedAssignmentGroup =>
    planner
      .LocalCourse?
      .AssignmentGroups
      .FirstOrDefault(g => g.Id == assignmentContext.Assignment?.LocalAssignmentGroupId);
}

@assignmentContext.Assignment?.Name

@if (assignmentContext.Assignment != null)
{
  <div class="m-1">
    <label class="form-label">
      Name
    </label>
    <input 
      class="form-control" 
      @bind="name"
      @oninput="handleNameChange" 
    />
  </div>
  <ButtonSelect
    Label="Assignment Group"
    Options="planner.LocalCourse.AssignmentGroups"
    GetId="(g) => g.Id"
    GetName="(g) => g.Name"
    OnSelect="(g) => setAssignmentGroup(g)"
    SelectedOption="selectedAssignmentGroup"
  />
  <div class="m-1">
    <AssignmentDescriptionEditor />
  </div>

  <div class="form-check m-1">
    <input 
      class="form-check-input" 
      id="lockAtDueDate" 
      type="checkbox" 
      @bind="lockAtDueDate"
      @oninput="handleLockAtDueDateChange" 
    />
    <label 
      class="form-check-label" 
      for="lockAtDueDate"
    >
      Lock At Due Date
    </label>
  </div>
  <div class="container">
    <RubricEditor />
    <hr>
    <div class="mx-5 px-5">
      <SubmissionTypeSelector />
    </div>
  </div>
}

<div class="d-flex justify-content-end m-3">

  <ConfirmationModal Label="Delete" Class="btn btn-danger" OnConfirmAsync="HandleDelete" />

  <button 
    class="btn btn-primary mx-2" 
    @onclick="@(() => {
      assignmentContext.Assignment = null;
      Navigation.NavigateTo("/course/" + planner.LocalCourse?.Name);
    })"
  >
    Done
  </button>
</div>

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