Move form state ownership from Home to leaf controls

RpgRoller/Components/Pages/HomeControls/CampaignManagementPanel.razor

@@ -29,7 +29,7 @@
         {
             <p class="form-error">@CampaignState.ErrorMessage</p>
         }
-        <form class="form-grid" @onsubmit="CreateCampaignSubmitted" @onsubmit:preventDefault>
+        <form class="form-grid" @onsubmit="SubmitCreateCampaignAsync" @onsubmit:preventDefault>
             <label for="campaign-name">Campaign name</label>
             <input id="campaign-name" @bind="CampaignState.Model.Name" @bind:event="oninput" />
             @if (CampaignState.Errors.TryGetValue("name", out var campaignNameError))
@@ -98,6 +98,8 @@
 </main>
 
 @code {
+    private FormState<CampaignFormModel> CampaignState { get; } = new();
+
     [Parameter]
     public IReadOnlyList<CampaignSummary> Campaigns { get; set; } = [];
 
@@ -110,9 +112,6 @@
     [Parameter]
     public CampaignDetails? SelectedCampaign { get; set; }
 
-    [Parameter]
-    public FormState<CampaignFormModel> CampaignState { get; set; } = new();
-
     [Parameter]
     public IReadOnlyList<RulesetDefinition> Rulesets { get; set; } = [];
 
@@ -129,11 +128,42 @@
     public EventCallback<ChangeEventArgs> CampaignSelectionChanged { get; set; }
 
     [Parameter]
-    public EventCallback CreateCampaignSubmitted { get; set; }
+    public Func<CampaignFormModel, Task<FormSubmissionResult>> CreateCampaignSubmitted { get; set; } = _ => Task.FromResult(new FormSubmissionResult());
 
     [Parameter]
     public EventCallback CreateCharacterRequested { get; set; }
 
     [Parameter]
     public EventCallback<CharacterSummary> EditCharacterRequested { get; set; }
+
+    protected override void OnParametersSet()
+    {
+        if (string.IsNullOrWhiteSpace(CampaignState.Model.RulesetId) && Rulesets.Count > 0)
+        {
+            CampaignState.Model.RulesetId = Rulesets[0].Id;
+        }
+    }
+
+    private async Task SubmitCreateCampaignAsync()
+    {
+        CampaignState.ResetValidation();
+
+        var result = await CreateCampaignSubmitted.Invoke(new CampaignFormModel
+        {
+            Name = CampaignState.Model.Name,
+            RulesetId = CampaignState.Model.RulesetId
+        });
+
+        CampaignState.Errors.Clear();
+        foreach (var (key, value) in result.Errors)
+        {
+            CampaignState.Errors[key] = value;
+        }
+
+        CampaignState.ErrorMessage = result.ErrorMessage;
+        if (result.IsSuccess)
+        {
+            CampaignState.Model.Name = string.Empty;
+        }
+    }
 }