using UnityEngine;
using System.Collections;

public class DayNightCycle : MonoBehaviour
{
    [SerializeField] private Light sunlight;
    [SerializeField] private GameObject sunTarget;
    [SerializeField] private GameObject sunriseTarget;
    [SerializeField] private GameObject sunsetTarget;
    [SerializeField] private GameObject noonTarget;
    [SerializeField] private float minIntensity = 0.1f;
    [SerializeField] private float maxIntensity = 2f;
    [SerializeField] private float sunriseTime = 21600f; // 6:00 AM
    [SerializeField] private float sunsetTime = 72000f; // 8:00 PM
    [SerializeField] private float noonTime = 43200f; // 12:00 PM
    [SerializeField] private float dayLengthInSeconds = 120f; // Real seconds for a full day
    [SerializeField] public bool isCityScriptPresent = true;

    public float CurrentTime { get; private set; } = 0f;
    private bool running = true;

    private void Start()
    {
        if (!isCityScriptPresent)
        {
            StartCoroutine(DayNightRoutine());
        }
    }

    private IEnumerator DayNightRoutine()
    {
        while (running)
        {
            // Advance time
            CurrentTime += (86400f / dayLengthInSeconds) * Time.deltaTime;
            if (CurrentTime >= 86400f)
            {
                CurrentTime = 0f;
                // Optionally: trigger a new day event here
            }
            UpdateDayCycle(CurrentTime);
            yield return null;
        }
    }

    public void UpdateDayCycle(float curTime)
    {
        if (sunlight == null || sunTarget == null) return;

        float intensity = minIntensity;
        Vector3 sunPosition = sunriseTarget != null ? sunriseTarget.transform.position : Vector3.zero;

        if (curTime >= sunriseTime && curTime <= sunsetTime)
        {
            if (curTime <= noonTime)
            {
                float t = (curTime - sunriseTime) / (noonTime - sunriseTime);
                intensity = Mathf.Lerp(minIntensity, maxIntensity, t);
                if (sunriseTarget != null && noonTarget != null)
                    sunPosition = Vector3.Lerp(sunriseTarget.transform.position, noonTarget.transform.position, t);
            }
            else
            {
                float t = (curTime - noonTime) / (sunsetTime - noonTime);
                intensity = Mathf.Lerp(maxIntensity, minIntensity, t);
                if (noonTarget != null && sunsetTarget != null)
                    sunPosition = Vector3.Lerp(noonTarget.transform.position, sunsetTarget.transform.position, t);
            }
        }
        else
        {
            intensity = minIntensity;
            if (sunsetTarget != null)
                sunPosition = sunsetTarget.transform.position;
        }

        sunlight.transform.position = sunPosition;
        sunlight.intensity = intensity;
        sunlight.transform.LookAt(sunTarget.transform.position);
    }

    private void Update()
    {
        if (!isCityScriptPresent)
            return;
        // If City script is present, expect UpdateDayCycle to be called externally with correct time
    }

    public void StopDayNightCycle()
    {
        running = false;
    }
}