@inherits DComponentBase

@* daisyUI Collapse: https://daisyui.com/components/collapse/ . The open state lives in C# (@bind-IsOpen) and is
   rendered with collapse-open / collapse-close; clicking the header (or Enter/Space on it) toggles it. neo-raised
   gives it the neumorphic panel look (see Styles/neo.css for why it isn't a @utility override). *@
<div @attributes="AdditionalAttributes" class="@CssClass">
	<div class="@Cx("collapse-title", Disabled ? "cursor-not-allowed" : "cursor-pointer", HeaderClass)" role="button"
		 tabindex="@(Disabled ? "-1" : "0")" aria-expanded="@(IsOpen ? "true" : "false")" aria-disabled="@(Disabled ? "true" : null)"
		 @onclick="Toggle" @onkeydown="OnKeyDown">
		@Header
	</div>
	<div class="@Cx("collapse-content", ContentClass)">
		@ChildContent
	</div>
</div>

@code {
	[Parameter] public RenderFragment Header { get; set; }
	[Parameter] public RenderFragment ChildContent { get; set; }
	[Parameter] public bool IsOpen { get; set; }
	[Parameter] public EventCallback<bool> IsOpenChanged { get; set; }
	[Parameter] public DCollapseIcon Icon { get; set; }
	[Parameter] public bool Disabled { get; set; }
	[Parameter] public string HeaderClass { get; set; }
	[Parameter] public string ContentClass { get; set; }

	string CssClass => Cx("collapse neo-raised", IconClass, IsOpen ? "collapse-open" : "collapse-close", Class);

	string IconClass => Icon switch
	{
		DCollapseIcon.Arrow => "collapse-arrow",
		DCollapseIcon.Plus => "collapse-plus",
		_ => null
	};

	async Task Toggle()
	{
		if (Disabled)
			return;
		IsOpen = !IsOpen;
		await IsOpenChanged.InvokeAsync(IsOpen);
	}

	Task OnKeyDown(KeyboardEventArgs e) => e.Key is "Enter" or " " ? Toggle() : Task.CompletedTask;
}