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

@*
	Les billets en main, clic droit (Money/Cash.cs) : combien, puis donner au joueur qu'on
	regarde ou poser au sol. Créée par le HUD sur chaque machine (pas dans la scène). L'hôte
	revérifie la somme et la distance.
*@

<root>
	@if ( IsOpen && Me is not null )
	{
		<div class="cash-backdrop">
			<div class="cash-panel">
				<div class="cash-head">
					<div class="cash-icon"><i>payments</i></div>
					<div class="cash-titles">
						<div class="cash-title">Billets</div>
						<div class="cash-sub">@($"Sur vous : {(Format.Money( Me.Wallet ))}")</div>
					</div>
				</div>

				<div class="field-label">Somme</div>
				<TextEntry class="cash-field" Value=@AmountText OnTextEdited=@((string v) => { AmountText = Digits( v ); })></TextEntry>
				<div class="cash-chips">
					@foreach ( var preset in Presets )
					{
						<div class="chip @(Amount == preset ? "on" : "")" onclick=@(() => AmountText = preset.ToString())>@Format.Money( preset )</div>
					}
					<div class="chip @(Amount == Me.Wallet && Me.Wallet > 0 ? "on" : "")" onclick=@(() => AmountText = Me.Wallet.ToString())>Tout</div>
				</div>

				<div class="cash-actions">
					@if ( Target.IsValid() )
					{
						<div class="btn primary @(Valid ? "" : "off")" onclick=@(() => Give())><i>volunteer_activism</i> @($"Donner à {Target.RpName}")</div>
					}
					<div class="btn @(Valid ? "" : "off")" onclick=@(() => Drop())><i>south</i> Poser au sol</div>
					<div class="btn ghost" onclick=@(() => Close())><i>close</i> Annuler</div>
				</div>
				@if ( !Target.IsValid() )
				{
					<div class="cash-hint">Pour donner, regardez quelqu'un de près.</div>
				}
			</div>
		</div>
	}
</root>

@code
{
	static CashMenu instance;

	/// <summary>Le clic gauche billets en main (VehicleKeySystem.LocalInput).</summary>
	public static void Open() => instance?.Show();

	public bool IsOpen { get; private set; }
	string AmountText { get; set; } = "";
	RoleplayPlayer Target { get; set; }

	static int[] Presets => new[] { 10, 50, 100, 500 };

	RoleplayPlayer Me => RoleplayPlayer.Local;

	int Amount => int.TryParse( AmountText, out var a ) ? a : 0;
	bool Valid => Amount > 0 && Me is not null && Amount <= Me.Wallet;

	protected override void OnStart() => instance = this;

	void Show()
	{
		if ( Me is null || UiLock.IsLocked )
			return;
		instance = this;
		Target = PlayerInFront();
		AmountText = "";
		IsOpen = true;
		UiLock.Set( "argent", true );
	}

	void Close()
	{
		IsOpen = false;
		UiLock.Set( "argent", false );
	}

	protected override void OnUpdate()
	{
		instance = this;
		if ( !IsOpen )
			return;
		// Échap, ou plus de billets en main (tombé, monté en voiture) : on referme.
		if ( Input.EscapePressed || !Cash.IsHeld( Me ) )
		{
			Input.EscapePressed = false;
			Close();
		}
	}

	protected override void OnDisabled()
	{
		if ( IsOpen )
			Close();
	}

	/// <summary>Le joueur qu'on regarde, de près (à pied, debout).</summary>
	RoleplayPlayer PlayerInFront()
	{
		var me = Me;
		var eye = me.GetComponent<PlayerController>()?.EyePosition ?? me.WorldPosition + Vector3.Up * 64;
		var forward = Scene.Camera?.WorldRotation.Forward ?? me.WorldRotation.Forward;
		return RoleplayPlayer.All
			.Where( p => p != me && !p.OnTheGround && p.GameObject.GetComponentInParent<Vehicle>() is null )
			.Select( p => (p, d: p.WorldPosition.Distance( me.WorldPosition ), aim: Vector3.Dot( (p.WorldPosition + Vector3.Up * 50 - eye).Normal, forward )) )
			.Where( x => x.d < Cash.Reach * 1.3f && x.aim > 0.6f )
			.OrderBy( x => x.d ).Select( x => x.p ).FirstOrDefault();
	}

	void Give()
	{
		if ( !Valid || !Target.IsValid() )
			return;
		Cash.RequestGive( Target.GameObject.Id, Amount );
		HorizonHud.ShowHotbar( HorizonHud.HandsPosition );
		Close();
	}

	void Drop()
	{
		if ( !Valid )
			return;
		Cash.RequestDrop( Amount );
		// Les billets posés, on revient aux mains (l'hôte les retire de la main).
		HorizonHud.ShowHotbar( HorizonHud.HandsPosition );
		Close();
	}

	static string Digits( string v )
	{
		var d = new string( (v ?? "").Where( char.IsDigit ).Take( 9 ).ToArray() );
		return d.TrimStart( '0' );
	}

	protected override int BuildHash() => HashCode.Combine( IsOpen, AmountText, Me?.Wallet, Target?.RpName );
}