using AppUI.Manager.Role;
using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace AppUI.Util.Avatar
{
    [Serializable]
    public struct AvatarItem
    {
        public int id;
        public Sprite avatar;
        public string name;
        public Transform avatarLine;
    }

    /// <summary>
    /// 预设头像网格：点击项更新 <see cref="targetImage"/>，并可通过 <see cref="OnAvatarSelected"/> 与 <see cref="AppUI.View.RegisterView"/> 等串联。
    /// </summary>
    public class AvatarGroup : MonoBehaviour
    {
        [SerializeField]
        Sprite[] _avatars;

        [Tooltip("可选：与 _avatars 一一对应的服务端 avatarID；未配置或长度不一致时用 RoleManager.PresetGridIndexToAvatarId")]
        [SerializeField]
        int[] _presetAvatarIds;

        /// <summary>与 Inspector 中配置的头像 Sprite 数组同源，供 <see cref="AppUI.View.RegisterView"/> 等读取，避免重复配置。</summary>
        public Sprite[] Avatars => _avatars;

        /// <summary>头像数量，与 <see cref="Avatars"/> 长度一致。</summary>
        public int AvatarCount => _avatars != null ? _avatars.Length : 0;

        List<AvatarItem> _avatarItems;

        public GameObject imagePanel;

        public GameObject imageObj;

        /// <summary>选中后写入的 Image；<see cref="AppUI.View.RegisterView"/> 可在运行时赋值为 <c>avatarPreviewImage</c> 以共用同一预览图。</summary>
        public Image targetImage;

        [Header("关联输入框文案颜色（可选）")]
        [SerializeField]
        TMP_InputField linkedInputField;

        [SerializeField]
        TMP_Text linkedLabelText;

        [SerializeField]
        Color textColorWhenHasValue = Color.black;

        [SerializeField]
        Color textColorWhenEmpty = new Color(0.5f, 0.5f, 0.5f, 1f);

        [Header("关联输入框图标（可选，与上面同一套 hasValue 逻辑）")]
        [SerializeField]
        Image linkedStateImage;

        [SerializeField]
        Sprite spriteWhenHasValue;

        [SerializeField]
        Sprite spriteWhenEmpty;

        /// <summary>当前选中下标，与 <see cref="_avatars"/> 一致。</summary>
        public int SelectedIndex { get; private set; }

        /// <summary>用户点击或通过 <see cref="SelectByIndex"/> 选中时触发（含索引与 Sprite）。</summary>
        public event Action<int, Sprite> OnAvatarSelected;

        void OnEnable()
        {
            BindLinkedInputField();
        }

        void OnDisable()
        {
            UnbindLinkedInputField();
        }

        void Start()
        {
            BuildListIfNeeded();
            if (_avatarItems != null && _avatarItems.Count > 0 && _avatars != null && _avatars.Length > 0)
                SelectByIndex(0, notify: false);
            RefreshLinkedLabelTextColor();
        }

        void BindLinkedInputField()
        {
            if (linkedInputField == null)
                return;
            linkedInputField.onValueChanged.RemoveListener(OnLinkedInputValueChanged);
            linkedInputField.onValueChanged.AddListener(OnLinkedInputValueChanged);
            RefreshLinkedLabelTextColor();
        }

        void UnbindLinkedInputField()
        {
            if (linkedInputField == null)
                return;
            linkedInputField.onValueChanged.RemoveListener(OnLinkedInputValueChanged);
        }

        void OnLinkedInputValueChanged(string _)
        {
            RefreshLinkedLabelTextColor();
        }

        /// <summary>
        /// 根据 <see cref="linkedInputField"/> 是否有内容：更新 <see cref="linkedLabelText"/> 颜色、
        /// <see cref="linkedStateImage"/> 的 Sprite（有值 / 空 两套）。
        /// </summary>
        public void RefreshLinkedLabelTextColor()
        {
            var hasValue = linkedInputField != null && linkedInputField.text.Trim().Length > 0;

            if (linkedLabelText != null)
                linkedLabelText.color = hasValue ? textColorWhenHasValue : textColorWhenEmpty;

            if (linkedStateImage == null)
                return;
            var sp = hasValue ? spriteWhenHasValue : spriteWhenEmpty;
            if (sp != null)
                linkedStateImage.sprite = sp;
        }

        void BuildListIfNeeded()
        {
            if (_avatarItems != null)
                return;

            _avatarItems = new List<AvatarItem>();
            if (_avatars == null || _avatars.Length == 0 || imagePanel == null || imageObj == null)
                return;

            for (var i = 0; i < _avatars.Length; i++)
            {
                var item = new AvatarItem
                {
                    id = i,
                    avatar = _avatars[i],
                    name = $"Avatar {i}"
                };

                var o = Instantiate(imageObj, imagePanel.transform);
                var img = o.GetComponent<Image>();
                if (img != null)
                    img.sprite = item.avatar;

                var lineTr = o.transform.Find("AvatarLine");
                if (lineTr != null)
                    item.avatarLine = lineTr;

                _avatarItems.Add(item);

                o.SetActive(true);
                var index = i;
                var btn = o.GetComponent<Button>();
                if (btn != null)
                    btn.onClick.AddListener(() => OnAvatarItemClick(index));
            }
        }

        void OnAvatarItemClick(int index)
        {
            SelectByIndex(index, notify: true);
            if (targetImage != null)
            {
                var p = targetImage.transform.parent;
                if (p != null && p.parent != null)
                    p.parent.gameObject.SetActive(true);
            }

            HideObj();
        }

        /// <summary>代码侧选中（与点击一致），用于与外部列表或 <see cref="AppUI.View.RegisterView.OnSelectPresetAvatar"/> 同步。</summary>
        public void SelectByIndex(int index, bool notify = true)
        {
            BuildListIfNeeded();
            if (_avatars == null || index < 0 || index >= _avatars.Length)
                return;

            SelectedIndex = index;

            if (targetImage != null)
                targetImage.sprite = _avatars[index];

            if (_avatarItems != null)
            {
                foreach (var avatarItem in _avatarItems)
                {
                    if (avatarItem.avatarLine != null)
                        avatarItem.avatarLine.gameObject.SetActive(avatarItem.id == index);
                }
            }

            if (notify)
                OnAvatarSelected?.Invoke(index, _avatars[index]);
        }

        public Sprite GetAvatarSprite(int index)
        {
            if (_avatars == null || index < 0 || index >= _avatars.Length)
                return null;
            return _avatars[index];
        }

        public Sprite GetSelectedSprite()
        {
            return GetAvatarSprite(SelectedIndex);
        }

        /// <summary>当前选中项对应的服务端 avatarID（与 <see cref="RoleManager.SetAvatarToImage"/> 资源约定一致）。</summary>
        public int GetSelectedAvatarId()
        {
            if (_presetAvatarIds != null
                && SelectedIndex >= 0
                && SelectedIndex < _presetAvatarIds.Length)
            {
                return _presetAvatarIds[SelectedIndex];
            }
            return RoleManager.PresetGridIndexToAvatarId(SelectedIndex);
        }

        public void HideObj()
        {
            if (imagePanel != null)
                imagePanel.SetActive(false);
        }

        public void ShowObj()
        {
            if (imagePanel != null)
                imagePanel.SetActive(true);
        }

        public void ToggleObj()
        {
            if (imagePanel != null)
                imagePanel.SetActive(!imagePanel.activeSelf);
        }
    }
}