using System.Collections.Generic;
using GameFramework.DataTable;
using GeometryTD.CustomEvent;
using GeometryTD.DataTable;
using GeometryTD.Definition;
using GeometryTD.Factory;
using GeometryTD.Procedure;
using Newtonsoft.Json.Linq;
using GeometryTD.UI;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace GeometryTD.CustomComponent
{
    public class EventNodeComponent : GameFrameworkComponent
    {
        private RunNodeExecutionContext _activeContext;

        private readonly List<EventItem> _eventItems = new List<EventItem>();

        private EventFormUseCase _eventFormUseCase;
        private bool _initialized;

        public void OnInit()
        {
            _eventItems.Clear();

            IDataTable<DREvent> dtEvent = GameEntry.DataTable.GetDataTable<DREvent>();
            if (dtEvent == null)
            {
                Log.Warning("Event data table is not loaded.");
                _initialized = true;
                return;
            }

            DREvent[] rows = dtEvent.GetAllDataRows();
            foreach (var drEvent in rows)
            {
                EventOption[] options = ParseOptions(drEvent.OptionsRaw);
                _eventItems.Add(new EventItem(drEvent.Id, drEvent.Title, drEvent.Description, options));
            }

            if (_eventFormUseCase == null)
            {
                _eventFormUseCase = new EventFormUseCase();
            }

            GameEntry.UIRouter.BindUIUseCase(UIFormType.EventForm, _eventFormUseCase);

            _initialized = true;
            Log.Info("EventNodeComponent initialized with {0} events.", _eventItems.Count);
        }

        public void StartEvent(RunNodeExecutionContext context = null)
        {
            if (!_initialized)
            {
                OnInit();
            }

            if (_eventItems.Count <= 0)
            {
                Log.Warning("EventNodeComponent has no event data.");
                return;
            }

            int index = Random.Range(0, _eventItems.Count);
            EventItem randomEvent = _eventItems[index];

            if (_eventFormUseCase == null)
            {
                Log.Warning("EventNodeComponent StartEvent failed. Event form is not initialized.");
                return;
            }
            
            _activeContext = context != null ? context.Clone() : null;
            _eventFormUseCase.SetCurrentEvent(randomEvent);
            GameEntry.UIRouter.OpenUI(UIFormType.EventForm);
            GameEntry.Event.Fire(
                this,
                NodeEnterEventArgs.Create(
                    _activeContext?.RunId,
                    _activeContext?.NodeId ?? 0,
                    _activeContext?.NodeType ?? RunNodeType.None,
                    _activeContext?.SequenceIndex ?? -1));
        }

        public void EndEvent()
        {
            GameEntry.UIRouter.CloseUI(UIFormType.EventForm);
            GameEntry.Event.Fire(
                this,
                NodeCompleteEventArgs.Create(
                    _activeContext?.RunId,
                    _activeContext?.NodeId ?? 0,
                    _activeContext?.NodeType ?? RunNodeType.None,
                    _activeContext?.SequenceIndex ?? -1,
                    RunNodeCompletionStatus.Completed,
                    true,
                    _activeContext != null
                        ? _activeContext.CreateCompletionSnapshot(
                            GameEntry.PlayerInventory != null ? GameEntry.PlayerInventory.GetInventorySnapshot() : null)
                        : null));
            ClearActiveNodeContext();
        }

        private void ClearActiveNodeContext()
        {
            _activeContext = null;
        }

        private static EventOption[] ParseOptions(string optionsRaw)
        {
            if (string.IsNullOrWhiteSpace(optionsRaw))
            {
                return System.Array.Empty<EventOption>();
            }

            try
            {
                JArray array = JArray.Parse(optionsRaw);
                List<EventOption> options = new List<EventOption>(array.Count);

                for (int i = 0; i < array.Count; i++)
                {
                    if (!(array[i] is JObject optionObj))
                    {
                        continue;
                    }

                    string optionText = optionObj.Value<string>("optionText") ?? string.Empty;
                    float probability = optionObj.Value<float?>("probability") ?? 1f;

                    EventRequirementBase[] requirements = ParseRequirements(optionObj["requirements"] as JArray);
                    EventEffectBase[] costEffects = ParseEffects(optionObj["costEffects"] as JArray, probability);
                    EventEffectBase[] rewardEffects = ParseEffects(optionObj["rewardEffects"] as JArray, probability);

                    options.Add(new EventOption(optionText, requirements, costEffects, rewardEffects, probability));
                }

                return options.ToArray();
            }
            catch (System.Exception e)
            {
                Log.Warning("Failed to parse event options json. {0}", e.Message);
                return System.Array.Empty<EventOption>();
            }
        }

        private static EventRequirementBase[] ParseRequirements(JArray requirementsArray)
        {
            if (requirementsArray == null || requirementsArray.Count == 0)
            {
                return System.Array.Empty<EventRequirementBase>();
            }

            List<EventRequirementBase> requirements = new List<EventRequirementBase>(requirementsArray.Count);
            for (int i = 0; i < requirementsArray.Count; i++)
            {
                if (!(requirementsArray[i] is JObject reqObj))
                {
                    continue;
                }

                string type = reqObj.Value<string>("type");
                JObject param = reqObj["param"] as JObject;
                EventRequirementBase requirement = EventRequirementFactory.Create(type, param);
                if (requirement != null)
                {
                    requirements.Add(requirement);
                }
            }

            return requirements.ToArray();
        }

        private static EventEffectBase[] ParseEffects(JArray effectsArray, float probability)
        {
            if (effectsArray == null || effectsArray.Count == 0)
            {
                return System.Array.Empty<EventEffectBase>();
            }

            List<EventEffectBase> effects = new List<EventEffectBase>(effectsArray.Count);
            for (int i = 0; i < effectsArray.Count; i++)
            {
                if (!(effectsArray[i] is JObject effectObj))
                {
                    continue;
                }

                string type = effectObj.Value<string>("type");
                JObject param = effectObj["param"] as JObject;
                EventEffectBase effect = EventEffectFactory.Create(type, param, probability);
                if (effect != null)
                {
                    effects.Add(effect);
                }
            }

            return effects.ToArray();
        }
    }
}