@using Sandbox;
@using Sandbox.UI;
@inherits PanelComponent
@namespace VehicleProto

@* Drive HUD — clean mode (design board 1a). Always visible while driving unless H hides it. *@

<root>
	@if ( UiState.HudHidden )
	{
		<div class="hints restore" onclick=@ToggleHud>
			<div class="hint">
				<span class="mono key">H</span>
				<span class="cap">Show UI</span>
			</div>
		</div>
	}
	else
	{
		<div class="topbar left">
			<div class="chip brand">
				<div class="dot"></div>
				<div class="name">VEHICLE PROTOTYPING</div>
			</div>
		</div>

		<div class="topbar right">
			<div class="chip">
				<div class="lbl">Car</div>
				<div class="carname">@CarName</div>
				<div class="mono tag">@CarClass</div>
			</div>
			<div class="chip">
				<div class="lbl">Assist</div>
				<div class="assist">@AssistText</div>
			</div>
		</div>

		<div class="cluster">
			<div class="topline">
				<div class="speedblock">
					<div class="mono speed">@SpeedDisplay</div>
					<div class="unit">@UserSettings.SpeedUnitLabel</div>
				</div>
				<div class="gearblock">
					<div class="mono gearchip @GearState">@GearText</div>
					<div class="gearlbl @(GearState == "shifting" ? "hot" : "")">@GearCaption</div>
				</div>
			</div>

			<div class="rpmblock">
				<div class="rpmhead">
					<div class="lbl">RPM</div>
					<div class="mono rpmtext @(RpmFraction > 0.97f ? "over" : "")">@RpmText <span>/ @RedlineText</span></div>
				</div>
				<div class="rpm">
					<div class="redzone"></div>
					<div class="fill @(RpmFraction > 0.9f ? "redline" : "")" style="width: @UiFmt.Pct( RpmFraction * 100f )%"></div>
				</div>
			</div>
		</div>

		@if ( !UiState.TelemetryOpen )
		{
			<div class="hints">
				<div class="hint"><span class="mono key">L</span><span class="cap">Telemetry</span></div>
				<div class="hint"><span class="mono key">T</span><span class="cap">Tuning</span></div>
				<div class="hint"><span class="mono key">I</span><span class="cap">Help</span></div>
				<div class="hint"><span class="mono key">TAB</span><span class="cap">Session</span></div>
				<div class="hint hide" onclick=@ToggleHud>
					<span class="mono key">H</span>
					<span class="cap">Hide UI</span>
				</div>
			</div>
		}
	}
</root>

@code {
	public VehicleController Target { get; set; }

	// DISPLAY ONLY: SignedSpeedMs stays SI (magnitude = SpeedMs, sign = travel direction); UserSettings
	// picks km/h vs mph at the last mile. Truncate toward zero (int cast) so reverse reads a negative
	// number and standstill jitter stays a steady 0 — the old abs-magnitude "F0" round-nearest flapped
	// 0/1 as the crawl speed crossed the 0.5-unit boundary when easing into reverse.
	string SpeedDisplay => ((int)UserSettings.ToDisplaySpeed( Target?.SignedSpeedMs ?? 0f )).ToString();
	string RpmText => (Target?.Drivetrain?.Rpm ?? 0f).ToString( "F0" );
	string RedlineText => (Target?.Definition?.RedlineRpm ?? 0f).ToString( "F0" );
	string CarName => Target?.Definition?.Name ?? "—";
	string CarClass => (Target?.Definition?.Layout ?? DriveLayout.FWD).ToString().ToLower();
	string AssistText => (Target?.Assists ?? AssistLevel.Casual).ToString().ToUpper();

	float RpmFraction => Target?.Drivetrain is null || Target.Definition is null
		? 0f
		: Math.Clamp( Target.Drivetrain.Rpm / Target.Definition.RedlineRpm, 0f, 1f );

	int GearNum => Target?.Drivetrain?.Gear ?? 1;

	string GearText => GearNum switch
	{
		-1 => "R",
		0 => "N",
		var g => g.ToString()
	};

	// normal / shifting / limiter / neutral / reverse (design 1d gear-chip states)
	string GearState
	{
		get
		{
			if ( Target?.Drivetrain is null ) return "";
			if ( Target.Drivetrain.IsShifting ) return "shifting";
			if ( GearNum == -1 ) return "reverse";
			if ( GearNum == 0 ) return "neutral";
			if ( RpmFraction > 0.97f && (Target?.Throttle ?? 0f) > 0.1f ) return "limiter";
			return "";
		}
	}

	string GearCaption => GearState == "shifting" ? "shifting" : "gear";

	void ToggleHud()
	{
		UiState.HudHidden = !UiState.HudHidden;
		StateHasChanged();
	}

	protected override void OnUpdate()
	{
		if ( Input.Pressed( "HideHud" ) )
			ToggleHud();

		// Esc is host-routed to the pause menu unless we CONSUME it via EscapePressed.
		// Close any cursor modal with Esc (same key that players expect); leave Esc alone
		// when nothing of ours is open so the engine pause path still works.
		// GUARD: while a tune rename OR the tuning dial-help overlay is active, that overlay owns Esc (Esc
		// backs out of the nested overlay, not the whole Tuning panel) — skip here so we don't consume first.
		if ( Input.EscapePressed && UiState.AnyCursorModalOpen && !TuneRenameState.Active && !UiState.TuneHelpOpen )
		{
			UiState.TuningOpen = false;
			UiState.SessionOpen = false;
			UiState.WorldOpen = false;
			UiState.HelpOpen = false;
			Input.EscapePressed = false;
			Mouse.Visibility = MouseVisibility.Hidden;
			StateHasChanged();
		}
	}

	protected override int BuildHash() => System.HashCode.Combine(
		System.HashCode.Combine( SpeedDisplay, GearText, GearState, (int)(RpmFraction * 60f),
			CarName, AssistText, UiState.TelemetryOpen ),
		// UserSettings.SpeedUnit: re-render the unit label the instant the player flips km/h↔mph,
		// even while stationary (both units read "0", so SpeedDisplay alone wouldn't change the hash).
		System.HashCode.Combine( UiState.HudHidden, UserSettings.SpeedUnit ) );
}