using OctoCore.Components;
using System;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace OctoCore.UI
{
    /// <summary>
    /// UI management module.
    /// Handles global UI scaling and screen size detection.
    /// </summary>
    [System.Serializable]
    public class OctoUI : IOctoModule
    {
        /// <summary>
        /// Global scale factor for all UI elements.
        /// </summary>
        public float GlobalScale = 1;
        
        /// <summary>
        /// Current screen size in pixels.
        /// </summary>
        [OctoReadOnly] public Vector2Int ScreenSize;

        private Action<float> OnGlobalScaleChange;
        private Action<Vector2Int> OnScreenResize;

        public void Init(OctoSettings settings)
        {
            // Callback OctoEvents

            if (OctoEvents.Instance)
                OctoEvents.Instance.SetUiInitialized();
        }

        public void Tick()
        {
            CheckSize();
        }

        public void OnSceneChanged(Scene current, Scene next)
        {

        }

        public void OnQuit()
        {

        }

        public void UnsubscribeOnGlobalScaleChange(Action<float> handler)
        {
            SubscribeOnGlobalScaleChange(handler, false);
        }

        public void SubscribeOnGlobalScaleChange(Action<float> handler, bool subscribe = true)
        {
            if (subscribe) OnGlobalScaleChange += handler;
            else OnGlobalScaleChange -= handler;
        }

        public void UnsubscribeOnScreenResize(Action<Vector2Int> handler)
        {
            SubscribeOnScreenResize(handler, false);
        }

        public void SubscribeOnScreenResize(Action<Vector2Int> handler, bool subscribe = true)
        {
            if (subscribe) OnScreenResize += handler;
            else OnScreenResize -= handler;
        }

        public void SetGlobalScale(float scale)
        {
            GlobalScale = scale;
            OnGlobalScaleChange?.Invoke(scale);
        }

        public void CheckSize()
        {
            if (ScreenSize.x != Screen.width || ScreenSize.y != Screen.height)
            {
                ScreenSize.x = Screen.width;
                ScreenSize.y = Screen.height;

                OnScreenResize?.Invoke(ScreenSize);
            }
        }

        public void SetCursor()
        {
            bool visible = true;
            CursorLockMode lockMode = CursorLockMode.None;

            if (OctoPlayer.Instance && !OctoPlayer.Instance.IsPaused)
            {
                visible = true;
                lockMode = CursorLockMode.Locked;
            }

            Cursor.visible = visible;
            Cursor.lockState = lockMode;
        }
    }
}