// SprayCan.cs
// A grabbable spray paint can, one script per can (any colour). Whoever holds it gets a Spray button (on screen, the F
// key on desktop, the right stick click in VR); while it is held down the can hisses, its spray particles run, and it
// sends the paint to whatever wall the player aims at. Walls are separate objects with the SprayWall script: every can
// paints every SprayWall, and a scene can have as many walls as it likes.
//
// Set up: make the can Grabbable (Aim With Camera on, the default), then slot its Particles (a particle system, a child
// of the can) and its SpraySound (an object with an Audio Source). Pick its PaintColor.
using IHXR.Simulation;

public class SprayCan : ScriptBase
{
    protected override bool SyncTransformStateByDefault => false;

    [Tooltip("This can's paint colour.")]
    public Color PaintColor = new Color(0.9f, 0.1f, 0.1f);
    [Tooltip("Spray width in metres right at the nozzle.")]
    public float NozzleSize = 0.03f;
    [Tooltip("How much wider the spray gets per metre from the wall.")]
    public float SpreadPerMetre = 0.18f;
    [Tooltip("No paint reaches a wall from further away than this (metres).")]
    public float MaxDistance = 2.5f;

    [Tooltip("The spray particle system (a child of the can); it runs while spraying.")]
    public SceneObject Particles;
    [Tooltip("An object with an Audio Source: plays over and over while spraying.")]
    public SceneObject SpraySound;

    [Tooltip("The button's label, desktop key and VR button.")]
    public string ButtonLabel = "Spray";
    public string ButtonKey = "F";
    public VRButton ButtonVR = VRButton.RightStickClick;
    [Tooltip("Writes what each spray hits to the script log (to check a wall is being hit).")]
    public bool DebugMode = false;

    private string holder = "";
    private bool spraying;

    public override void Start()
    {
        if (IsValid(Particles)) SetParticlesPlaying(Particles, false);
        ListenForGrab(OnGrab);
        ListenForActionButton("spray", OnSpray);
        holder = GetHolder();
        if (holder.Length > 0) ShowActionButton(holder, "spray", ButtonLabel, ButtonKey, ButtonVR);
    }

    private bool IsValid(SceneObject o) => o != null && !o.IsNull;

    // Picked up: the holder gets the Spray button. Let go: it goes, and any spraying stops.
    private void OnGrab(GrabInfo info)
    {
        if (info.IsGrabbed)
        {
            if (holder.Length > 0 && holder != info.Username) HideActionButton(holder, "spray");
            holder = info.Username;
            ShowActionButton(holder, "spray", ButtonLabel, ButtonKey, ButtonVR);
        }
        else if (info.Username == holder)
        {
            HideActionButton(holder, "spray");
            holder = "";
            SetSpraying(false);
        }
    }

    // While the button is down: paint goes to the wall that is hit (the SprayWall there decides what to do with it).
    private void OnSpray(ActionButtonInfo info)
    {
        if (info.Username != holder) { if (DebugMode) Log("SprayCan: " + info.Username + " pressed Spray but " + (holder.Length > 0 ? holder : "nobody") + " holds the can"); return; }
        SetSpraying(info.IsDown);
        if (!info.IsDown) return;
        if (DebugMode) Log("SprayCan: " + info.State + (info.HasHit ? " hit " + string.Join(" / ", info.HitObjectIds) + (info.HasUV ? " at " + info.HitUV.x.ToString("0.00") + ", " + info.HitUV.y.ToString("0.00") : " (no texture position)") + ", " + info.HitDistance.ToString("0.00") + " m" : " (aiming at nothing)"));
        if (!info.HasHit || !info.HasUV) return;
        float distance = info.HitDistance < 0 ? MaxDistance : info.HitDistance;
        if (distance > MaxDistance) return;
        PostScriptEvent("SprayPaint",
            "objectId", info.HitObjectId, "rootObjectId", info.HitRootObjectId, "objectIds", string.Join("|", info.HitObjectIds), "material", info.HitMaterialIndex,
            "u", info.HitUV.x, "v", info.HitUV.y, "distance", distance, "maxDistance", MaxDistance,
            "nozzle", NozzleSize, "spread", SpreadPerMetre,
            "r", PaintColor.r, "g", PaintColor.g, "b", PaintColor.b,
            "sprayer", holder + "/" + Self.ObjectId);
    }

    private void SetSpraying(bool on)
    {
        if (spraying == on) return;
        spraying = on;
        if (IsValid(Particles)) SetParticlesPlaying(Particles, on);
        if (IsValid(SpraySound)) { if (on) PlayAudioLoop(SpraySound); else StopAudio(SpraySound); }
    }
}