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

public class MoonOrbitPluto : MonoBehaviour
{
    public Transform pluto;

    public PlutoMoonType moonType = PlutoMoonType.Charon;
    public bool autoCalculateOrbit = true;
    public float manualOrbitRadius = 10f;

    public float orbitInclination = 0.08f;
    public float startAngleDegrees = 0f;

    public float timeScale = 10f;

    public bool showDebugInfo = false;

    private const float PLUTO_RADIUS_KM = 1188f;

    private const float CHARON_RADIUS_KM = 606f;
    private const float CHARON_DISTANCE_KM = 19591f;
    private const float CHARON_PERIOD_HOURS = 153.3f;

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

    public enum PlutoMoonType
    {
        Charon
    }

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

        CalculateOrbit();
        SetInitialPosition();
    }

    void CalculateOrbit()
    {
        float plutoRadius = pluto.localScale.x / 2f;

        if (autoCalculateOrbit)
        {
            switch (moonType)
            {
                case PlutoMoonType.Charon:
                    orbitRadius = plutoRadius * (CHARON_DISTANCE_KM / PLUTO_RADIUS_KM);
                    angularSpeed = (2f * Mathf.PI / (CHARON_PERIOD_HOURS * 3600f)) * timeScale;
                    orbitInclination = 0.08f;
                    break;
            }
        }
        else
        {
            orbitRadius = manualOrbitRadius;
            float period = GetPeriod() * 3600f;
            angularSpeed = (2f * Mathf.PI / period) * timeScale;
        }
    }

    float GetPeriod()
    {
        switch (moonType)
        {
            case PlutoMoonType.Charon: return CHARON_PERIOD_HOURS;
            default: return CHARON_PERIOD_HOURS;
        }
    }

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

    void Update()
    {
        if (pluto == 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 = pluto.position + new Vector3(x, y, z);
    }

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

        Color gizmoColor = new Color(0.7f, 0.7f, 0.7f, 0.5f);

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