using Dpz.Core.Public.ViewModel;
using Dpz.Core.Public.ViewModel.Response;

namespace Dpz.Core.Web.Models;

/// <summary>
/// 源码搜索结果视图模型（按父目录分组）
/// </summary>
public class CodeSearchResultsViewModel
{
    /// <summary>
    /// 搜索关键词
    /// </summary>
    public required string Keyword { get; set; }

    /// <summary>
    /// 匹配总数
    /// </summary>
    public int Total { get; set; }

    /// <summary>
    /// 按父目录分组的结果
    /// </summary>
    public List<CodeSearchResultGroup> Groups { get; set; } = [];

    /// <summary>
    /// 根据搜索匹配项构建分组结果
    /// </summary>
    public static CodeSearchResultsViewModel FromSearch(
        string keyword,
        IReadOnlyCollection<CodeFileSystemEntryResponse> entries
    )
    {
        var groups = entries
            .GroupBy(x => string.Join("/", x.ParentPathSegments))
            .OrderBy(x => x.Key, StringComparer.OrdinalIgnoreCase)
            .Select(g => new CodeSearchResultGroup
            {
                ParentPath = g.First().ParentPathSegments.ToList(),
                Items = g.OrderBy(x => x.Name, StringComparer.OrdinalIgnoreCase)
                    .Select(ToChildrenTree)
                    .ToList(),
            })
            .ToList();

        return new CodeSearchResultsViewModel
        {
            Keyword = keyword,
            Total = entries.Count,
            Groups = groups,
        };
    }

    private static ChildrenTree ToChildrenTree(CodeFileSystemEntryResponse entry)
    {
        return new ChildrenTree
        {
            Name = entry.Name,
            LastUpdateTime = entry.LastWriteTime,
            CurrentPath = entry.PathSegments.ToList(),
            Note = entry.Description ?? "",
        };
    }
}

/// <summary>
/// 源码搜索结果分组（同一父目录下的匹配项）
/// </summary>
public class CodeSearchResultGroup
{
    /// <summary>
    /// 父目录路径分段（根目录为空集合）
    /// </summary>
    public List<string> ParentPath { get; set; } = [];

    /// <summary>
    /// 父目录名称（用于图标匹配，根目录为空）
    /// </summary>
    public string? ParentName => ParentPath.Count > 0 ? ParentPath[^1] : null;

    /// <summary>
    /// 该目录下的匹配项
    /// </summary>
    public List<ChildrenTree> Items { get; set; } = [];
}