using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace AI.Models.SpecialMessages
{
    /// <summary>
    /// 表格数据预览行 - 一行单元格
    /// </summary>
    public class TableDataRow : INotifyPropertyChanged
    {
        /// <summary>该行单元格（与列顺序一致）</summary>
        public ObservableCollection<string> Cells { get; } = new ObservableCollection<string>();

        public event PropertyChangedEventHandler? PropertyChanged;
        protected void OnPropertyChanged(string propertyName) =>
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    /// <summary>
    /// 表格数据展示特殊消息 - 用于导入数据等在聊天流中做数据预览
    /// </summary>
    public class TableDataMessage : ISpecialMessage, INotifyPropertyChanged
    {
        private string _title = "数据预览";
        private int _totalRowCount;
        private int _maxPreviewRows = 50;

        /// <summary>消息唯一标识符</summary>
        public string Id { get; set; } = Guid.NewGuid().ToString();

        /// <summary>类型名称</summary>
        public string TypeName => "Table";

        /// <summary>不需要实时更新</summary>
        public bool IsLive => false;

        /// <summary>标题（如“数据预览”）</summary>
        public string Title
        {
            get => _title;
            set => SetProperty(ref _title, value);
        }

        /// <summary>列名（表头）</summary>
        public ObservableCollection<string> ColumnNames { get; } = new ObservableCollection<string>();

        /// <summary>预览行数据</summary>
        public ObservableCollection<TableDataRow> Rows { get; } = new ObservableCollection<TableDataRow>();

        /// <summary>数据总行数（用于显示“共 N 行，仅显示前 M 行”）</summary>
        public int TotalRowCount
        {
            get => _totalRowCount;
            set => SetProperty(ref _totalRowCount, value);
        }

        /// <summary>最多预览行数</summary>
        public int MaxPreviewRows
        {
            get => _maxPreviewRows;
            set => SetProperty(ref _maxPreviewRows, value);
        }

        /// <summary>是否有多余行未显示</summary>
        public bool HasMoreRows => TotalRowCount > Rows.Count;

        /// <summary>摘要文案（如“共 100 行，仅显示前 50 行”）</summary>
        public string SummaryText => $"共 {TotalRowCount} 行，仅显示前 {Rows.Count} 行";

        public event PropertyChangedEventHandler? PropertyChanged;

        protected void OnPropertyChanged([CallerMemberName] string? propertyName = null) =>
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

        protected bool SetProperty<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
        {
            if (EqualityComparer<T>.Default.Equals(field, value))
                return false;
            field = value;
            OnPropertyChanged(propertyName);
            if (propertyName == nameof(TotalRowCount) || propertyName == nameof(MaxPreviewRows))
            {
                OnPropertyChanged(nameof(HasMoreRows));
                OnPropertyChanged(nameof(SummaryText));
            }
            return true;
        }

        /// <summary>从列名与行数据批量填充（每行为字符串数组，与列顺序一致）</summary>
        public void SetData(IEnumerable<string> columnNames, IEnumerable<IEnumerable<string>> rows, int? totalRowCount = null)
        {
            ColumnNames.Clear();
            foreach (var c in columnNames)
                ColumnNames.Add(c ?? string.Empty);

            Rows.Clear();
            foreach (var row in rows)
            {
                var r = new TableDataRow();
                foreach (var cell in row)
                    r.Cells.Add(cell?.ToString() ?? string.Empty);
                Rows.Add(r);
            }

            TotalRowCount = totalRowCount ?? Rows.Count;
            OnPropertyChanged(nameof(HasMoreRows));
            OnPropertyChanged(nameof(SummaryText));
        }
    }
}