using System;
using Ext.B83.Unity.Attributes;
using InterfaceOff.MainMenu;
using InterfaceOff.WorldScene;
using UnityEngine;
using Random = UnityEngine.Random;

namespace InterfaceOff
{
    [Serializable] public struct SpawnableWindowType
    {
        [field: SerializeField, MonoScript] private string Typename { get; set; }
        public Type Type => Type.GetType(Typename);
        
        [field: SerializeField] public int SpawnWeight { get; private set; }
    }

    public class WindowSpawner : MonoBehaviour
    {
        [field: SerializeField] private GameObject SampleChild { get; set; }
        [field: SerializeField] private Canvas GameCanvas { get; set; }
        [field: SerializeField] private GameObject DeathInfo { get; set; }
        [field: SerializeField] private SpawnableWindowType[] WindowTypes { get; set; }
        [field: SerializeField] private GameObject Parent { get; set; }
        private int TotalSpawnWeight { get; set; }
        
        [field: SerializeField] public int SpawnedWindowCount { get; private set; }

        [field: SerializeField] public bool AutoSpawn { get; private set; } = true;
        private int TimeTillNextSpawn { get; set; }
        
        private void Awake()
        {
            /* Logs the amount of types found and errors if there is none */
            Debug.Log($"Found [{WindowTypes.Length}] different window types ");
            if (WindowTypes.Length == 0)
            {
                Debug.LogError("Could not find any window types");
                return;
            }
            
            /* Calculates the total spawn weight */
            TotalSpawnWeight = 0;
            foreach (SpawnableWindowType type in WindowTypes)
            {
                TotalSpawnWeight += type.SpawnWeight;
            }
        }

        private Type GetRandomWindowType()
        {
            int currentTypeWeight = Random.Range(0, TotalSpawnWeight);
            foreach (SpawnableWindowType type in WindowTypes)
            {
                currentTypeWeight -= type.SpawnWeight;
                if (currentTypeWeight <= 0)
                {
                    return type.Type;
                }
            }

            return WindowTypes[0].Type;
        }

        private void SpawnNewRandomWindow()
        {
            /* Creates the gameobject with a random class */
            GameObject go = Instantiate(SampleChild, Parent.transform);
            go.SetActive(true);

            Type type = GetRandomWindowType();
            go.name = type.Name;
            
            WindowBase windowBase = go.AddComponent(type) as WindowBase;

            /* Checks it created correctly before instantiating further */
            if (DebugUtils.IsNull(windowBase))
            {
                Debug.LogError("How did this happen");
                return;
            }
            
            /* Updates the window trackers */
            SpawnedWindowCount++;

            /* Makes sure the WindowInteractions and WindowComponents are set up before passing to user code */
            windowBase.Interactions = go.GetComponent<WindowInteractions>();
            windowBase.Interactions.SetAttachedTo(windowBase);

            windowBase.Components = go.GetComponent<WindowComponents>();
            windowBase.InstantiateWindowBase(creator: this);
        }
        
        public void AlertOfDespawnedWindow() => SpawnedWindowCount--;

        private void FixedUpdate()
        {
            /* Spawns new windows whilst active */
            if (AutoSpawn)
            {
                const int TICKS_PER_SECOND = 20; // Unity constant
                const int MIN_SPAWN_TIME = 2 * TICKS_PER_SECOND;
                const int MAX_SPAWN_TIME = 5 * TICKS_PER_SECOND;

                int currentMaxSpawnTime = MAX_SPAWN_TIME - (int)(ScoreTracker.CurrentScore() / DifficultyManager.DifficultyEffect);
                currentMaxSpawnTime = Math.Clamp(currentMaxSpawnTime, MIN_SPAWN_TIME + 1, MAX_SPAWN_TIME);
                
                /* Decreases the spawn counter and spawns if at 0 */
                TimeTillNextSpawn = Math.Max(0, TimeTillNextSpawn - 1);
                if (TimeTillNextSpawn == 0)
                {
                    float difficulty = DifficultyManager.DifficultyMultiplier;
                    TimeTillNextSpawn = Random.Range((int)(MIN_SPAWN_TIME * difficulty), (int)(currentMaxSpawnTime * difficulty));
                    SpawnNewRandomWindow();
                }
            }
            
            /* Else checks if it should reload the scene */
            else if (Input.GetKey(KeyCode.Space))
            {
                SceneController.ReloadScene();
            }
        }

        public void StartEndSequence()
        {
            /* Destroys all children and stops them from spawning */
            AutoSpawn = false;
            foreach (Transform child in Parent.transform)
            {
                WindowBase window = child.GetComponent<WindowBase>();
                if (DebugUtils.IsNotNull(window))
                {
                    window.DestroyWindow();
                }
            }

            /* Makes the death text visible to the player */
            DeathInfo.SetActive(true);
        }
    }
}