using UnityEngine;
using TMPro;
using UnityEngine.InputSystem;

public class IncenseController : MonoBehaviour
{
    [Header("References")]
    public Transform incensePivot;
    public Transform incenseStick;
    public ParticleSystem smokeParticles;

    [Header("Light (URP only)")]
    public UnityEngine.Rendering.Universal.Light2D glowLight;  // URP 版本
                                                               // 如果用 Built-in，用這個：
                                                               // public SpriteRenderer glowSprite;

    [Header("Falling Settings")]
    public float startHeight = 3f;
    public float targetHeight = -2.5f;
    public float fallDuration = 30f;

    [Header("Struggle Settings")]
    public float windForceMin = 20f;
    public float windForceMax = 60f;
    public float windChangeSpeed = 5f;
    public float playerControlStrength = 100f;

    [Header("Visual Settings")]
    public float maxGlowIntensity = 3f;

    [Header("UI")]
    public TextMeshProUGUI messageText;
    public TextMeshProUGUI angleText;
    public TextMeshProUGUI timerText;

    [Header("Audio (Optional)")]
    public AudioSource backgroundMusic;

    private float currentAngle = 90f;
    private float targetWindAngle = 90f;
    private float lastAngleValue = 90f;
    private float stability = 1f;
    private float fallTimer = 0f;
    private bool hasLanded = false;
    private float finalSincerity = 0f;

    void Start()
    {
        if (incensePivot != null)
        {
            Vector3 pos = incensePivot.position;
            pos.y = startHeight;
            incensePivot.position = pos;
        }

        currentAngle = Random.Range(60f, 120f);
        targetWindAngle = currentAngle;

        if (glowLight != null)
        {
            glowLight.intensity = 1f;
        }

        Debug.Log($"遊戲開始！時長: {fallDuration} 秒");
    }

    void Update()
    {
        // 按 R 重新開始
        if (Keyboard.current.rKey.wasPressedThisFrame)  
        {
            UnityEngine.SceneManagement.SceneManager.LoadScene(
                UnityEngine.SceneManagement.SceneManager.GetActiveScene().name
            );
        }

        if (!hasLanded)
        {
            UpdateFalling();
            HandleInput();
            CalculateStability();
            UpdateVisuals();
            UpdateUI();
        }
        else
        {
            DisplayFinalResult();
        }
    }

    void UpdateFalling()
    {
        fallTimer += Time.deltaTime;

        if (fallTimer >= fallDuration)
        {
            hasLanded = true;
            fallTimer = fallDuration;

            float angleDeviation = Mathf.Abs(currentAngle - 90f);
            finalSincerity = 1f - (angleDeviation / 30f);
            finalSincerity = Mathf.Clamp01(finalSincerity);

            Debug.Log($"角度: {currentAngle:F1}°, 誠意度: {finalSincerity * 100:F0}%");
            return;
        }

        // 計算下降
        float t = fallTimer / fallDuration;
        float currentHeight = Mathf.Lerp(startHeight, targetHeight, t);

        if (incensePivot != null)
        {
            Vector3 pos = incensePivot.position;
            pos.y = currentHeight;
            incensePivot.position = pos;
        }

        // 風力計算
        float windMultiplier = 1f - (t * 0.5f);
        float currentWindMax = windForceMax * windMultiplier;

        float windChange = Random.Range(-currentWindMax, currentWindMax) * Time.deltaTime;
        targetWindAngle += windChange;
        targetWindAngle = Mathf.Clamp(targetWindAngle, 30f, 150f);

        currentAngle = Mathf.Lerp(currentAngle, targetWindAngle, windChangeSpeed * Time.deltaTime);
        currentAngle = Mathf.Clamp(currentAngle, 30f, 150f);

        // 2D 旋轉（Z 軸）
        if (incensePivot != null)
        {
            incensePivot.rotation = Quaternion.Euler(0, 0, currentAngle - 90f);
        }
    }

    void HandleInput()
    {
        if (Mouse.current.leftButton.isPressed)
        {
            Vector2 mouseDelta = Mouse.current.delta.ReadValue();
            float mouseX = mouseDelta.x;
            currentAngle += mouseX * playerControlStrength * Time.deltaTime * 0.1f;  // 可能需要調整係數
            currentAngle = Mathf.Clamp(currentAngle, 30f, 150f);
        }
    }
        void CalculateStability()
    {
        float angleChange = Mathf.Abs(currentAngle - lastAngleValue);
        stability = Mathf.Clamp01(1f - angleChange / 10f);
        lastAngleValue = currentAngle;
    }

    void UpdateVisuals()
    {
        float angleDeviation = Mathf.Abs(currentAngle - 90f);
        float sincerity = 1f - (angleDeviation / 30f);
        sincerity = Mathf.Clamp01(sincerity);

        // 更新光線（URP）
        if (glowLight != null)
        {
            Color lightColor = Color.Lerp(Color.red, Color.yellow, sincerity);
            glowLight.color = lightColor;
            glowLight.intensity = Mathf.Lerp(0.5f, maxGlowIntensity, sincerity);
        }

        // 更新煙霧
        if (smokeParticles != null)
        {
            var emission = smokeParticles.emission;
            emission.rateOverTime = Mathf.Lerp(5f, 30f, 1f - stability);
        }

        // 更新音樂音量（如果有）
        if (backgroundMusic != null)
        {
            backgroundMusic.volume = Mathf.Lerp(0.2f, 0.8f, sincerity);
        }
    }

    void UpdateUI()
    {
        // 角度顯示
        if (angleText != null)
        {
            angleText.text = $"角度: {currentAngle:F0}°";
        }

        // 倒數計時
        if (timerText != null)
        {
            float remaining = fallDuration - fallTimer;
            timerText.text = $"倒計時{remaining:F1}秒";

            if (remaining <= 5f)
            {
                float flicker = Mathf.Sin(Time.time * 10f) * 0.5f + 0.5f;
                timerText.color = Color.Lerp(Color.red, Color.yellow, flicker);
                timerText.fontSize = 40 + Mathf.Sin(Time.time * 8f) * 5f;
            }
            else if (remaining <= 10f)
            {
                timerText.color = Color.yellow;
                timerText.fontSize = 40;
            }
            else
            {
                timerText.color = Color.white;
                timerText.fontSize = 40;
            }
        }

        // 誠意訊息
        if (messageText != null)
        {
            float angleDeviation = Mathf.Abs(currentAngle - 90f);
            float sincerity = 1f - (angleDeviation / 30f);
            sincerity = Mathf.Clamp01(sincerity);

            string message = "";
            Color messageColor = Color.white;

            if (sincerity >= 0.95f)
            {
                message = "😊 完美!最高誠意!";
                messageColor = new Color(0.2f, 1f, 0.2f);
            }
            else if (sincerity >= 0.75f)
            {
                message = "不錯!還算虔誠";
                messageColor = new Color(0.5f, 1f, 0.5f);
            }
            else if (sincerity >= 0.60f)
            {
                message = "普通~可以更好";
                messageColor = new Color(1f, 1f, 0.3f);
            }
            else if (sincerity >= 0.40f)
            {
                message = "誠意不足...需努力";
                messageColor = new Color(1f, 0.6f, 0.2f);
            }
            else
            {
                message = "太歪了!需要反省";
                messageColor = new Color(1f, 0.2f, 0.2f);
            }

            messageText.text = message;
            messageText.color = messageColor;
        }
    }

    void DisplayFinalResult()
    {
        // 光線閃爍
        if (glowLight != null)
        {
            float flicker = 0.8f + Mathf.Sin(Time.time * 3f) * 0.2f;
            glowLight.intensity = maxGlowIntensity * finalSincerity * flicker;
        }

        // UI 顯示
        if (timerText != null)
        {
            timerText.text = "時間到!";
            timerText.color = Color.yellow;
        }

        if (angleText != null)
        {
            angleText.text = $"最終角度: {currentAngle:F0}°";
        }

        if (messageText != null)
        {
            if (finalSincerity >= 0.95f)
            {
                messageText.text = "完美插香!最高誠意!";
                messageText.color = Color.yellow;
            }
            else if (finalSincerity >= 0.75f)
            {
                messageText.text = $"不錯!誠意度: {finalSincerity * 100:F0}%";
                messageText.color = new Color(0.5f, 1f, 0.5f);
            }
            else
            {
                messageText.text = $"可惜!誠意度: {finalSincerity * 100:F0}%";
                messageText.color = new Color(1f, 0.6f, 0.2f);
            }
        }
    }
}