using System.Collections.Generic;
using System.Reflection;
using HutongGames.PlayMaker;
using MSCO;
using UnityEngine;

[assembly: AssemblyTitle("Show Bolt Size")]
[assembly: AssemblyProduct("Show Bolt Size")]
[assembly: AssemblyDescription("Shows the size of the bolt you look at, so you pick the right wrench.")]
[assembly: AssemblyVersion("1.0.1.0")]
[assembly: AssemblyFileVersion("1.0.1.0")]
[assembly: AssemblyInformationalVersion("1.0.1")]

namespace ShowBoltSize
{
    /// <summary>
    /// Zeigt unter dem Fadenkreuz die Größe der Schraube, auf die man schaut ("10 mm"). Jede Schraube hat die FSM "Screw"
    /// mit der Variable "BoltSize". Deren Kollider sind nur mit Werkzeug in der Hand aktiv - deshalb kein Raycast, sondern:
    /// die Schraube, die am nächsten an der Blickrichtung liegt (bis 1,3 m). Nur Anzeige, ändert nichts am Spiel.
    /// </summary>
    public class ShowBoltSize : MscoMod
    {
        public override string ID { get { return "showboltsize"; } }
        public override string Name { get { return "Show Bolt Size"; } }
        public override string Version { get { return "1.0.1"; } }
        public override string Author { get { return "MBM"; } }

        const float MaxDistance = 1.3f;
        const float BoltRadius = 0.025f; // so groß wirkt eine Schraube beim Zielen
        const float ScanInterval = 5f;

        sealed class Bolt
        {
            public Transform Transform;
            public FsmFloat SizeF;
            public FsmInt SizeI;
        }

        readonly List<Bolt> bolts = new List<Bolt>();
        bool inGame;
        float nextScan;
        string label;
        GUIStyle style;
        Camera camera;
        bool reported;

        public override void OnMenuLoad() { inGame = false; bolts.Clear(); label = null; camera = null; reported = false; }
        public override void OnGameLoad() { inGame = true; nextScan = 0f; }

        /// <summary>
        /// Spielerkamera: Camera.main gibt es in My Summer Car nicht immer (die Kamera des Spielers ist "FPSCamera").
        /// </summary>
        Camera FindCamera()
        {
            if (camera != null && camera.enabled && camera.gameObject.activeInHierarchy) return camera;
            camera = null;
            foreach (Camera c in Camera.allCameras)
                if (c.name == "FPSCamera") { camera = c; break; }
            if (camera == null) camera = Camera.main;
            return camera;
        }

        public override void Update()
        {
            label = null;
            if (!inGame) return;
            Camera cam = FindCamera();
            if (cam == null) return;
            if (Time.realtimeSinceStartup >= nextScan) Scan(cam);

            Transform eye = cam.transform;
            Vector3 eyePos = eye.position, forward = eye.forward;
            Bolt best = null;
            float bestAngle = float.MaxValue;
            for (int i = 0; i < bolts.Count; i++)
            {
                Bolt b = bolts[i];
                if (b.Transform == null) continue;
                Vector3 to = b.Transform.position - eyePos;
                float sq = to.sqrMagnitude;
                if (sq > MaxDistance * MaxDistance || sq < 0.0025f) continue;
                if (!b.Transform.gameObject.activeInHierarchy) continue;
                float distance = Mathf.Sqrt(sq);
                float angle = Vector3.Angle(forward, to);
                float limit = Mathf.Atan2(BoltRadius, distance) * Mathf.Rad2Deg + 0.5f;
                if (angle < limit && angle < bestAngle)
                {
                    bestAngle = angle;
                    best = b;
                }
            }
            if (best != null) label = Describe(best);
        }

        /// <summary>
        /// Schrauben aus MSCOs gemeinsamer Liste aller FSMs holen (SceneCache) - nicht selbst das ganze Spiel durchsuchen,
        /// das ließ das Spiel alle paar Sekunden kurz hängen.
        /// </summary>
        void Scan(Camera cam)
        {
            nextScan = Time.realtimeSinceStartup + ScanInterval;
            bolts.Clear();
            foreach (PlayMakerFSM fsm in SceneCache.Fsms(30f))
            {
                if (fsm == null || fsm.FsmName != "Screw") continue;
                FsmFloat f = fsm.FsmVariables.FindFsmFloat("BoltSize");
                FsmInt i = fsm.FsmVariables.FindFsmInt("BoltSize");
                if (f == null && i == null) continue;
                bolts.Add(new Bolt { Transform = fsm.transform, SizeF = f, SizeI = i });
            }
            if (!reported)
            {
                reported = true;
                Log("camera " + cam.name + ", " + bolts.Count + " bolts with a size");
            }
        }

        /// <summary>Größe in mm. Das Spiel speichert sie je nach Schraube als 10 oder als 1.0 (= 10 mm).</summary>
        static string Describe(Bolt b)
        {
            float value = b.SizeF != null ? b.SizeF.Value : b.SizeI.Value;
            if (value <= 0f) return null;
            float mm = value < 2.5f ? value * 10f : value;
            return Mathf.RoundToInt(mm) + " mm";
        }

        public override void OnGUI()
        {
            if (label == null) return;
            if (style == null)
            {
                style = new GUIStyle(GUI.skin.label) { alignment = TextAnchor.MiddleCenter, fontSize = 16, fontStyle = FontStyle.Bold };
                style.normal.textColor = Color.white;
            }
            var r = new Rect(Screen.width / 2f - 50f, Screen.height / 2f + 22f, 100f, 26f);
            Color old = GUI.color;
            GUI.color = new Color(0f, 0f, 0f, 0.6f);
            GUI.DrawTexture(r, Texture2D.whiteTexture);
            GUI.color = old;
            GUI.Label(r, label, style);
        }
    }
}