using System;
using System.Collections.Generic;
using AibisDream.Utility;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace AibisDream.UI
{
    /// <summary>
    /// 终端 Record Page（遗留类名 Panel）。挂在局内 InGameTerminalPanel 壳下。
    /// </summary>
    public class TerminalRecordPanel : MonoBehaviour
    {
        [SerializeField] private TerminalPanelAnimator panelAnimator;
        [SerializeField] private Button backButton;
        [SerializeField] private ScrollRect scrollRect;
        [SerializeField] private Transform recordRoot;
        [SerializeField] private TerminalRecordItemView recordItemPrefab;
        [SerializeField] private TMP_Text emptyText;

        private readonly List<LineInfo> _recordDataList = new List<LineInfo>();
        private InGameTerminalPanel _owner;

        public bool IsOpen => gameObject.activeSelf;

        public void SetOwner(InGameTerminalPanel owner)
        {
            _owner = owner;
        }

        private void Awake()
        {
            backButton?.onClick.AddListener(ReturnGame);
            EnsureScrollViewportMask();
        }

        private void EnsureScrollViewportMask()
        {
            if (scrollRect == null)
            {
                return;
            }

            var legacyMask = scrollRect.GetComponent<Mask>();
            if (legacyMask != null)
            {
                legacyMask.enabled = false;
            }

            if (scrollRect.TryGetComponent<Image>(out var scrollImage))
            {
                var color = scrollImage.color;
                color.a = 0f;
                scrollImage.color = color;
                scrollImage.raycastTarget = true;
            }

            if (scrollRect.viewport == null)
            {
                return;
            }

            if (scrollRect.viewport.GetComponent<RectMask2D>() == null)
            {
                scrollRect.viewport.gameObject.AddComponent<RectMask2D>();
            }
        }

        private void OnDestroy()
        {
            backButton?.onClick.RemoveListener(ReturnGame);
        }

        public void Show()
        {
            _owner?.SetHeader("termnial_header_record", "REPAIR_STATION_07 - AUTH_VERIFIED");
            if (panelAnimator != null)
            {
                panelAnimator.Show(onComplete: () => StartCoroutine(DrawRecordsWhenReady()));
            }
            else
            {
                gameObject.SetActive(true);
                StartCoroutine(DrawRecordsWhenReady());
            }
        }

        public void Hide(Action onComplete = null)
        {
            if (panelAnimator != null)
            {
                panelAnimator.Hide(() =>
                {
                    ClearRecordItems();
                    onComplete?.Invoke();
                });
            }
            else
            {
                ClearRecordItems();
                gameObject.SetActive(false);
                onComplete?.Invoke();
            }
        }

        public void AppendDialogLine(LineInfo lineInfo)
        {
            _recordDataList.Add(lineInfo);
        }

        public void ClearDialog()
        {
            _recordDataList.Clear();
        }

        private System.Collections.IEnumerator DrawRecordsWhenReady()
        {
            DrawRecords();
            yield return null;
            ScrollToBottom();
        }

        private void ConfigureContentRect()
        {
            if (recordRoot is not RectTransform content)
            {
                return;
            }

            content.anchorMin = new Vector2(0f, 1f);
            content.anchorMax = new Vector2(1f, 1f);
            content.pivot = new Vector2(0.5f, 1f);
            content.anchoredPosition = Vector2.zero;
            content.sizeDelta = Vector2.zero;
        }

        private static void ConfigureRecordItemRect(RectTransform itemRect)
        {
            itemRect.anchorMin = new Vector2(0f, 1f);
            itemRect.anchorMax = new Vector2(1f, 1f);
            itemRect.pivot = new Vector2(0.5f, 1f);
            itemRect.sizeDelta = Vector2.zero;
        }

        private static void SyncUiLayer(GameObject target, int layer)
        {
            target.layer = layer;
            for (var i = 0; i < target.transform.childCount; i++)
            {
                SyncUiLayer(target.transform.GetChild(i).gameObject, layer);
            }
        }

        private void DrawRecords()
        {
            ClearRecordItems();
            ConfigureContentRect();

            var hasRecords = _recordDataList.Count > 0;

            if (emptyText != null)
            {
                emptyText.gameObject.SetActive(!hasRecords);
            }

            foreach (var recordData in _recordDataList)
            {
                var item = Instantiate(recordItemPrefab, recordRoot);
                SyncUiLayer(item.gameObject, recordRoot.gameObject.layer);
                item.Init(recordData);

                if (item.transform is RectTransform itemRect)
                {
                    ConfigureRecordItemRect(itemRect);
                }
            }

            if (recordRoot is RectTransform contentRect)
            {
                LayoutRebuilder.ForceRebuildLayoutImmediate(contentRect);
            }
        }

        private void ScrollToBottom()
        {
            if (scrollRect == null)
            {
                return;
            }

            if (recordRoot is RectTransform contentRect)
            {
                LayoutRebuilder.ForceRebuildLayoutImmediate(contentRect);
            }

            Canvas.ForceUpdateCanvases();
            scrollRect.verticalNormalizedPosition = 0f;
        }

        private void ClearRecordItems()
        {
            if (recordRoot != null)
            {
                recordRoot.DestroyAllChildren();
            }
        }

        private void ReturnGame()
        {
            _owner?.Back();
        }
    }
}