using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

namespace OTGIntegrated.Quests
{
    public sealed class QuestLogUI : MonoBehaviour
    {
        public GameObject panelRoot;
        public Transform activeListRoot;
        public Transform completedListRoot;
        public Text titleText;
        public Text detailText;
        public Button closeButton;
        public Font uiFont;

        private QuestManager questManager;
        private QuestState selectedState;
        private readonly List<GameObject> spawnedButtons = new List<GameObject>();

        public void Initialize(QuestManager manager)
        {
            questManager = manager;
            if (questManager != null)
            {
                questManager.OnQuestsChanged -= Refresh;
                questManager.OnQuestsChanged += Refresh;
            }

            if (closeButton != null)
            {
                closeButton.onClick.RemoveAllListeners();
                closeButton.onClick.AddListener(() => FindObjectOfType<OTGIntegrated.UI.UIManager>()?.CloseCurrentWindow());
            }

            Refresh();
        }

        private void OnEnable()
        {
            Refresh();
        }

        private void OnDestroy()
        {
            if (questManager != null)
            {
                questManager.OnQuestsChanged -= Refresh;
            }
        }

        public void Refresh()
        {
            ClearButtons();

            if (titleText != null)
            {
                titleText.text = "Журнал квестов";
            }

            if (questManager == null)
            {
                SetDetails(null);
                return;
            }

            if (selectedState == null && questManager.ActiveQuests.Count > 0)
            {
                selectedState = questManager.ActiveQuests[0];
            }

            CreateButtons(activeListRoot, questManager.ActiveQuests);
            CreateButtons(completedListRoot, questManager.CompletedQuests);
            SetDetails(selectedState);
        }

        private void CreateButtons(Transform parent, IReadOnlyList<QuestState> states)
        {
            if (parent == null || states == null)
            {
                return;
            }

            for (int i = 0; i < states.Count; i++)
            {
                QuestState state = states[i];
                if (state == null || state.questData == null)
                {
                    continue;
                }

                GameObject root = new GameObject(state.questData.displayName, typeof(RectTransform), typeof(Image), typeof(Button));
                root.transform.SetParent(parent, false);
                spawnedButtons.Add(root);
                root.GetComponent<RectTransform>().sizeDelta = new Vector2(320f, 44f);

                Image image = root.GetComponent<Image>();
                image.color = GetStatusColor(state.status);

                Text label = CreateText(root.transform, "Text", state.questData.displayName, 16, TextAnchor.MiddleLeft);
                label.rectTransform.anchorMin = Vector2.zero;
                label.rectTransform.anchorMax = Vector2.one;
                label.rectTransform.offsetMin = new Vector2(12f, 0f);
                label.rectTransform.offsetMax = new Vector2(-8f, 0f);

                Button button = root.GetComponent<Button>();
                button.onClick.AddListener(() =>
                {
                    selectedState = state;
                    SetDetails(selectedState);
                });
            }
        }

        private void SetDetails(QuestState state)
        {
            if (detailText == null)
            {
                return;
            }

            if (state == null || state.questData == null)
            {
                detailText.text = "Нет выбранного квеста.";
                return;
            }

            QuestData quest = state.questData;
            detailText.text =
                $"{quest.displayName}\n\n{quest.description}\n\nСтатус: {state.status}\n\n{questManager.GetStateProgressText(state)}\n\nНаграды:\nОпыт: {quest.rewardExperience}\nОчки талантов: {quest.rewardTalentPoints}";
        }

        private Color GetStatusColor(QuestStatus status)
        {
            switch (status)
            {
                case QuestStatus.ReadyToComplete:
                    return new Color(0.16f, 0.42f, 0.22f, 0.95f);
                case QuestStatus.Completed:
                    return new Color(0.16f, 0.2f, 0.34f, 0.82f);
                default:
                    return new Color(0.46f, 0.34f, 0.12f, 0.92f);
            }
        }

        private Text CreateText(Transform parent, string name, string value, int fontSize, TextAnchor anchor)
        {
            GameObject textObject = new GameObject(name, typeof(RectTransform), typeof(Text));
            textObject.transform.SetParent(parent, false);
            Text text = textObject.GetComponent<Text>();
            text.font = uiFont != null ? uiFont : Resources.GetBuiltinResource<Font>("Arial.ttf");
            text.fontSize = fontSize;
            text.alignment = anchor;
            text.color = new Color(0.94f, 0.93f, 0.88f, 1f);
            text.text = value;
            return text;
        }

        private void ClearButtons()
        {
            for (int i = 0; i < spawnedButtons.Count; i++)
            {
                if (spawnedButtons[i] != null)
                {
                    Destroy(spawnedButtons[i]);
                }
            }

            spawnedButtons.Clear();
        }
    }
}