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using UnityEngine;

namespace Naninovel.UI
{
    public class TitleAutoContinueButton : ScriptableButton
    {
        private IStateManager stateManager;
        private IScriptPlayer scriptPlayer;
        private IScriptManager scriptManager;
        private ISaveSlotManager<GameStateMap> slotManager => stateManager?.GameSlotManager;
        
        protected override void Awake ()
        {
            base.Awake();

            stateManager = Engine.GetService<IStateManager>();
            scriptPlayer = Engine.GetService<IScriptPlayer>();
            scriptManager = Engine.GetService<IScriptManager>();
        }

        protected override void Start ()
        {
            base.Start();

            ControlInteractability(default);
        }

        protected override void OnEnable ()
        {
            base.OnEnable();

            stateManager.GameSlotManager.OnSaved += ControlInteractability;
            stateManager.GameSlotManager.OnDeleted += ControlInteractability;
        }

        protected override void OnDisable ()
        {
            base.OnDisable();

            stateManager.GameSlotManager.OnSaved -= ControlInteractability;
            stateManager.GameSlotManager.OnDeleted -= ControlInteractability;
        }

        protected override void OnButtonClick ()
        {
            HandleLoadSlot();
        }
        
        protected virtual async void HandleLoadSlot ()
        {
            string lastSaveId = null;
            GameStateMap lastSave = null;
            
            for (int slotNumber = 0; slotNumber < stateManager.Configuration.SaveSlotLimit; slotNumber++)
            {
                var slotId = stateManager.Configuration.IndexToSaveSlotId(slotNumber);
                if (!slotManager.SaveSlotExists(slotId)) continue;
                var state = await slotManager.LoadAsync(slotId);
                if (lastSave == null || lastSave.SaveDateTime < state.SaveDateTime)
                {
                    lastSaveId = slotId;
                    lastSave = state;
                }
            }

            for (int slotNumber = 0; slotNumber < stateManager.Configuration.QuickSaveSlotLimit; slotNumber++ )
            {
                var slotId = stateManager.Configuration.IndexToQuickSaveSlotId(slotNumber);
                if (!slotManager.SaveSlotExists(slotId)) continue;
                var state = await slotManager.LoadAsync(slotId);
                if (lastSave == null || lastSave.SaveDateTime < state.SaveDateTime)
                {
                    lastSaveId = slotId;
                    lastSave = state;
                }
            }

            if (!slotManager.SaveSlotExists(lastSaveId)) return;
            await PlayTitleLoad();
            using (await LoadingScreen.ShowAsync())
            {
                Hide();
                Engine.GetService<IUIManager>()?.GetUI<ITitleUI>()?.Hide();
                await stateManager.LoadGameAsync(lastSaveId);
            }
        }

        private void ControlInteractability (string _) => UIComponent.interactable = stateManager.AnyGameSaveExists;
        
        protected virtual async UniTask PlayTitleLoad ()
        {
            const string label = "OnLoad";
            var scriptName = scriptManager.Configuration.TitleScript;
            if (!scriptManager.TryGetScript(scriptName, out var script) || !script.LabelExists(label)) return;
            scriptPlayer.ResetService();
            await scriptPlayer.PreloadAndPlayAsync(scriptName, label: label);
            await UniTask.WaitWhile(() => scriptPlayer.Playing);
        }
    }
}