using System;
using System.Collections;
using FishNet.Object;
using TMPro;
using Types;
using UnityEngine;
using UnityEngine.Rendering.Universal;

// possible future additions
// weather sys
// skybox changes based on time of day
// moon and stars
// clouds
// rain

// Sound effects, bird chrirping, crickets, wind, etc

// Temperture? 

// Lighting effects! So that the transition is more visually appealing

// Moonlight phases based on day of month ect

// Seasons - impact the length of day, temp, weather, etc

namespace Managers
{
    public class GameTimeManager : NetworkBehaviour
    {
        // public float dayLengthInMinutes = 15f;
        // public float dayStartTimeInHours = 6f; // Start time in hours

        public Light2D globalLight;
        public TMP_Text timeText;
        public TMP_Text dayText;
        public TMP_Text seasonText;

        public Gradient lightColorGradient;
        public Gradient lightIntensityGradient;

        private readonly int _daysPerMonth = 28;
        private readonly int _monthsPerYear = 4;

        // private Season _currentSeason;
        // private float _currentTime;
        // private int _daysPassed;

        private GameManager _gameManager;

        private bool _isFirstDay = true;


        private void Awake()
        {
            _gameManager = GameManager.Instance;
        }

        private void Start()
        {
            if (IsServerInitialized)
            {
                dayText.text = GetCurrentDayOfMonth().ToString();
                seasonText.text = GetCurrentSeason().ToString();

                StartCoroutine(ServerDayNightCycleCoroutine());
                _isFirstDay = false;
            }
        }


        private void Update()
        {
            timeText.text = GetCurrentTime();

            //todo: optimize to only update on day change
            dayText.text = GetCurrentDayOfMonth().ToString();
            seasonText.text = GetCurrentSeason().ToString();
            var timeSettings = GameManager.Instance.GetTimeSettings();
            timeSettings.CurrentTime = timeSettings.DayStartTimeInHours / 24 *
                                       timeSettings.DayLengthInMinutes * 60;

            GameManager.Instance.RequestUpdateTimeSettingsServerRpc(timeSettings);
        }

        public override void OnStartClient()
        {
            base.OnStartClient();
            UpdateUIDisplay();
        }

        private void UpdateUIDisplay()
        {
            timeText.text = GetCurrentTime();

            //todo: optimize to only update on day change
            dayText.text = GetCurrentDayOfMonth().ToString();
            seasonText.text = GetCurrentSeason().ToString();
        }

        public override void OnStartServer()
        {
            base.OnStartServer();
            StartCoroutine(ServerDayNightCycleCoroutine());
        }

        public static event Action OnDayChange;
        public static event Action OnSeasonChange;


        public Season GetCurrentSeason()
        {
            return GetCurrentSeason(GetDaysPassed());
        }

        public Season GetCurrentSeason(int daysPassed)
        {
            var month = GetCurrentMonth(daysPassed);
            return month switch
            {
                0 => Season.Spring,
                1 => Season.Summer,
                2 => Season.Fall,
                3 => Season.Winter,
                _ => Season.Spring
            };
        }

        public int GetCurrentDayOfMonth()
        {
            return _gameManager.GetTimeSettings().DaysPassed % _daysPerMonth;
        }

        public int GetCurrentMonth()
        {
            return GetDaysPassed() / _daysPerMonth % _monthsPerYear;
        }

        public int GetCurrentMonth(int daysPassed)
        {
            return daysPassed / _daysPerMonth % _monthsPerYear;
        }


        private string GetCurrentTime()
        {
            var timeSettings = GameManager.Instance.GetTimeSettings();
            // Calculate the current hour and minute based on the time of day
            var timeOfDay = timeSettings.CurrentTime / (timeSettings.DayLengthInMinutes * 60);
            var hours = Mathf.FloorToInt(timeOfDay * 24);
            var minutes = Mathf.FloorToInt((timeOfDay * 24 - hours) * 60);

            // Convert to 12-hour format and add AM/PM
            var hours12 = hours % 12;
            if (hours12 == 0) hours12 = 12;
            var amPm = hours < 12 ? "AM" : "PM";

            return $"{hours12:D2}:{minutes:D2} {amPm}";
        }

        public int GetDaysPassed()
        {
            var timeSettings = GameManager.Instance.GetTimeSettings();
            return timeSettings.DaysPassed;
        }


        [Server]
        private IEnumerator ServerDayNightCycleCoroutine()
        {
            // var previousSeason = GetCurrentSeason();
            while (true)
            {
                var timeSettings = _gameManager.GetTimeSettings();
                // Calculate the current time of day between 0 (midnight) and 1 (next midnight)
                var timeOfDay = timeSettings.CurrentTime / (timeSettings.DayLengthInMinutes * 60);

                /*// Adjust the intensity of the light source based on the time of day
                globalLight.color = lightColorGradient.Evaluate(timeOfDay);
                globalLight.intensity = lightIntensityGradient.Evaluate(timeOfDay).a;*/

                // increment current time
                timeSettings.CurrentTime += Time.deltaTime;


                // check if a day has passed
                if (timeSettings.CurrentTime >= timeSettings.DayLengthInMinutes * 60)
                {
                    timeSettings.DaysPassed++;
                    Debug.Log("Day " + timeSettings.DaysPassed + " has passed");
                    timeSettings.CurrentTime = 0;
                    _isFirstDay = false;

                    OnDayChange?.Invoke();

                    var newSeason = GetCurrentSeason(timeSettings.DaysPassed);
                    if (newSeason != timeSettings.Season)
                    {
                        Debug.Log("Season changed from " + timeSettings.Season + " to " + newSeason);
                        timeSettings.Season = newSeason;
                        OnSeasonChange?.Invoke();
                    }
                }

                _gameManager.RequestUpdateTimeSettingsServerRpc(timeSettings);

                UpdateClientsRpc(timeOfDay);

                yield return null;
            }
        }

        [ObserversRpc]
        private void UpdateClientsRpc(float timeOfDay)
        {
            globalLight.color = lightColorGradient.Evaluate(timeOfDay);
            globalLight.intensity = lightIntensityGradient.Evaluate(timeOfDay).a;

            UpdateUIDisplay();
        }
    }
}