using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MoonOrbitJupiter : MonoBehaviour
{
    public Transform jupiter;

    public JupiterMoonType moonType = JupiterMoonType.Io;
    public bool autoCalculateOrbit = true;
    public float manualOrbitRadius = 10f;

    public float orbitInclination = 0.04f;
    public float startAngleDegrees = 0f;

    public float timeScale = 10f;

    public bool showDebugInfo = false;

    private const float JUPITER_RADIUS_KM = 69911f;

    private const float IO_RADIUS_KM = 1821f;
    private const float IO_DISTANCE_KM = 421700f;
    private const float IO_PERIOD_HOURS = 42.5f;

    private const float EUROPA_RADIUS_KM = 1560f;
    private const float EUROPA_DISTANCE_KM = 671100f;
    private const float EUROPA_PERIOD_HOURS = 85.2f;

    private const float GANYMEDE_RADIUS_KM = 2634f;
    private const float GANYMEDE_DISTANCE_KM = 1070400f;
    private const float GANYMEDE_PERIOD_HOURS = 171.7f;

    private const float CALLISTO_RADIUS_KM = 2410f;
    private const float CALLISTO_DISTANCE_KM = 1882700f;
    private const float CALLISTO_PERIOD_HOURS = 400.5f;

    private float orbitRadius;
    private float angularSpeed;
    private float currentAngle = 0f;
    private float orbitCount = 0f;
    private float debugTimer = 0f;

    public enum JupiterMoonType
    {
        Io,
        Europa,
        Ganymede,
        Callisto
    }

    void Start()
    {
        if (jupiter == null)
        {
            jupiter = GameObject.Find("Jupiter")?.transform;
            if (jupiter == null)
            {
                enabled = false;
                return;
            }
        }

        CalculateOrbit();
        SetInitialPosition();

    }

    void CalculateOrbit()
    {
        float jupiterRadius = jupiter.localScale.x / 2f;

        if (autoCalculateOrbit)
        {
            switch (moonType)
            {
                case JupiterMoonType.Io:
                    orbitRadius = jupiterRadius * (IO_DISTANCE_KM / JUPITER_RADIUS_KM);
                    angularSpeed = (2f * Mathf.PI / (IO_PERIOD_HOURS * 3600f)) * timeScale;
                    orbitInclination = 0.04f;
                    break;

                case JupiterMoonType.Europa:
                    orbitRadius = jupiterRadius * (EUROPA_DISTANCE_KM / JUPITER_RADIUS_KM);
                    angularSpeed = (2f * Mathf.PI / (EUROPA_PERIOD_HOURS * 3600f)) * timeScale;
                    orbitInclination = 0.47f;
                    break;

                case JupiterMoonType.Ganymede:
                    orbitRadius = jupiterRadius * (GANYMEDE_DISTANCE_KM / JUPITER_RADIUS_KM);
                    angularSpeed = (2f * Mathf.PI / (GANYMEDE_PERIOD_HOURS * 3600f)) * timeScale;
                    orbitInclination = 0.20f;
                    break;

                case JupiterMoonType.Callisto:
                    orbitRadius = jupiterRadius * (CALLISTO_DISTANCE_KM / JUPITER_RADIUS_KM);
                    angularSpeed = (2f * Mathf.PI / (CALLISTO_PERIOD_HOURS * 3600f)) * timeScale;
                    orbitInclination = 0.51f;
                    break;
            }
        }
        else
        {
            orbitRadius = manualOrbitRadius;
            float period = GetPeriod() * 3600f;
            angularSpeed = (2f * Mathf.PI / period) * timeScale;
        }
    }

    float GetPeriod()
    {
        switch (moonType)
        {
            case JupiterMoonType.Io: return IO_PERIOD_HOURS;
            case JupiterMoonType.Europa: return EUROPA_PERIOD_HOURS;
            case JupiterMoonType.Ganymede: return GANYMEDE_PERIOD_HOURS;
            case JupiterMoonType.Callisto: return CALLISTO_PERIOD_HOURS;
            default: return IO_PERIOD_HOURS;
        }
    }

    void SetInitialPosition()
    {
        currentAngle = startAngleDegrees * Mathf.Deg2Rad;
        UpdatePosition();
    }

    void Update()
    {
        if (jupiter == null) return;

        currentAngle += angularSpeed * Time.deltaTime;

        if (currentAngle >= 2f * Mathf.PI)
        {
            currentAngle -= 2f * Mathf.PI;
            orbitCount++;

            if (showDebugInfo)
            {
                Debug.Log(moonType + " orbit " + orbitCount);
            }
        }

        UpdatePosition();

        if (showDebugInfo)
        {
            debugTimer += Time.deltaTime;
            if (debugTimer >= 10f)
            {
                debugTimer = 0f;
                float progress = (currentAngle / (2f * Mathf.PI)) * 100f;
                Debug.Log(moonType + ": R=" + orbitRadius.ToString("F2") + " P=" + progress.ToString("F1") + "%");
            }
        }
    }

    void UpdatePosition()
    {
        float x = Mathf.Cos(currentAngle) * orbitRadius;
        float z = Mathf.Sin(currentAngle) * orbitRadius;

        float inclinationRad = orbitInclination * Mathf.Deg2Rad;
        float y = z * Mathf.Sin(inclinationRad);
        z = z * Mathf.Cos(inclinationRad);

        transform.position = jupiter.position + new Vector3(x, y, z);
    }

    void OnDrawGizmos()
    {
        if (jupiter == null) return;

        Color gizmoColor = Color.white;
        switch (moonType)
        {
            case JupiterMoonType.Io:
                gizmoColor = new Color(1f, 0.9f, 0.3f, 0.5f);
                break;
            case JupiterMoonType.Europa:
                gizmoColor = new Color(0.8f, 0.9f, 1f, 0.5f);
                break;
            case JupiterMoonType.Ganymede:
                gizmoColor = new Color(0.7f, 0.6f, 0.5f, 0.5f);
                break;
            case JupiterMoonType.Callisto:
                gizmoColor = new Color(0.5f, 0.5f, 0.5f, 0.5f);
                break;
        }

        Gizmos.color = gizmoColor;

        int segments = 64;
        Vector3 prevPos = GetOrbitPoint(0);

        for (int i = 1; i <= segments; i++)
        {
            Vector3 newPos = GetOrbitPoint(i * 2f * Mathf.PI / segments);
            Gizmos.DrawLine(prevPos, newPos);
            prevPos = newPos;
        }
    }

    Vector3 GetOrbitPoint(float angle)
    {
        float x = Mathf.Cos(angle) * orbitRadius;
        float z = Mathf.Sin(angle) * orbitRadius;

        float inclinationRad = orbitInclination * Mathf.Deg2Rad;
        float y = z * Mathf.Sin(inclinationRad);
        z = z * Mathf.Cos(inclinationRad);

        return jupiter.position + new Vector3(x, y, z);
    }
}