using System;
using System.Collections.Generic;
using Aisu.SIM1.Face.Models;
using UnityEngine;
using UnityEngine.UI;

namespace Aisu.SIM1.Face.Samples.FaceDetectionDemo
{
    /// <summary>
    /// MVP 用户列表窗口。
    /// </summary>
    public sealed class FaceDetectionDemoUserList : MonoBehaviour
    {
        [SerializeField] private Transform m_content;            // 列表容器。
        [SerializeField] private Font m_font;                    // UI 字体。

        private Action<int> m_deleteHandler;                     // 删除回调。

        /// <summary>
        /// 绑定 UI。
        /// </summary>
        public void Bind(Transform content, Font font, Action<int> deleteHandler)
        {
            m_content = content;
            m_font = font;
            m_deleteHandler = deleteHandler;
        }

        /// <summary>
        /// 刷新用户列表。
        /// </summary>
        public void SetUsers(IList<FaceUserInfo> users)
        {
            Clear();
            if (users == null || users.Count == 0)
            {
                AddText("暂无用户数据");
                return;
            }

            for (var i = 0; i < users.Count; i++)
            {
                AddRow(users[i]);
            }
        }

        /// <summary>
        /// 清空列表。
        /// </summary>
        public void Clear()
        {
            if (m_content == null)
            {
                return;
            }

            for (var i = m_content.childCount - 1; i >= 0; i--)
            {
                Destroy(m_content.GetChild(i).gameObject);
            }
        }

        private void AddRow(FaceUserInfo user)
        {
            var row = new GameObject("User_" + user.UserId, typeof(RectTransform), typeof(HorizontalLayoutGroup), typeof(Image));
            row.transform.SetParent(m_content, false);
            row.GetComponent<Image>().color = new Color(0.94f, 0.96f, 0.98f);
            var layout = row.GetComponent<HorizontalLayoutGroup>();
            layout.padding = new RectOffset(8, 8, 6, 6);
            layout.spacing = 8;
            layout.childControlWidth = true;
            layout.childForceExpandWidth = false;
            row.AddComponent<LayoutElement>().preferredHeight = 44;

            AddText(row.transform, $"ID: {user.UserId}  姓名: {user.UserName}  管理员: {user.IsAdmin}", 1f);
            AddButton(row.transform, "删除", () => m_deleteHandler?.Invoke(user.UserId));
        }

        private void AddText(string text)
        {
            AddText(m_content, text, 1f);
        }

        private Text AddText(Transform parent, string text, float flexibleWidth)
        {
            var go = new GameObject("Text", typeof(RectTransform), typeof(Text));
            go.transform.SetParent(parent, false);
            var label = go.GetComponent<Text>();
            label.font = m_font;
            label.fontSize = 22;
            label.color = Color.black;
            label.alignment = TextAnchor.MiddleLeft;
            label.text = text;
            go.AddComponent<LayoutElement>().flexibleWidth = flexibleWidth;
            return label;
        }

        private void AddButton(Transform parent, string text, UnityEngine.Events.UnityAction action)
        {
            var go = new GameObject(text, typeof(RectTransform), typeof(Image), typeof(Button));
            go.transform.SetParent(parent, false);
            go.GetComponent<Image>().color = new Color(0.82f, 0.88f, 0.95f);
            var button = go.GetComponent<Button>();
            button.onClick.AddListener(action);
            var layout = go.AddComponent<LayoutElement>();
            layout.preferredWidth = 92;
            layout.preferredHeight = 34;

            var labelGo = new GameObject("Text", typeof(RectTransform), typeof(Text));
            labelGo.transform.SetParent(go.transform, false);
            var rect = labelGo.GetComponent<RectTransform>();
            rect.anchorMin = Vector2.zero;
            rect.anchorMax = Vector2.one;
            rect.offsetMin = Vector2.zero;
            rect.offsetMax = Vector2.zero;
            var label = labelGo.GetComponent<Text>();
            label.font = m_font;
            label.fontSize = 20;
            label.color = Color.black;
            label.alignment = TextAnchor.MiddleCenter;
            label.text = text;
        }
    }
}