using MAF1.Agents;

namespace MAF1.Route;

/// <summary>控制台里用户原话。路径还是描述，交给专家自己判断，不在 C# 里写死。</summary>
public sealed class RouteUserInput
{
    public string Raw { get; init; } = "";
    public string? ResolvedFilePath { get; init; }

    public bool HasRaw => !string.IsNullOrWhiteSpace(Raw);

    public string Describe()
    {
        if (!string.IsNullOrWhiteSpace(ResolvedFilePath))
        {
            return $"已解析到文件 {ResolvedFilePath}";
        }

        string preview = Raw.Replace("\r\n", " ").Replace('\n', ' ').Trim();
        if (preview.Length > 80)
        {
            preview = preview[..80] + "…";
        }

        return $"用户原话「{preview}」";
    }

    public string ToTask()
        => $"""
            请根据用户下面这句话完成任务：提取有效城市，并在图允许时查询天气。
            若这句话是本地文件路径，就读文件；若是描述、问句或城市名单，就直接从这句话提取，不要读文件。

            用户输入：
            {Raw}
            """;

    public static RouteUserInput ReadFromConsole(RouteGraph graph)
    {
        string? fallback = graph.Nodes
            .Select(n => n.Type == SystemNodeTypes.FileCity && n.Config.TryGetValue("filePath", out string? path) ? path : null)
            .FirstOrDefault(p => !string.IsNullOrWhiteSpace(p));

        Console.WriteLine("请输入：本地文件路径，或一段描述/城市名单（例如：帮我查成都和杭州的天气）。");
        if (!string.IsNullOrWhiteSpace(fallback))
        {
            Console.WriteLine($"直接回车则使用图里的默认文件：{fallback}");
        }

        Console.Write("> ");
        string? line = Console.ReadLine();
        string trimmed = line?.Trim() ?? "";
        if (trimmed.Length == 0)
        {
            trimmed = fallback ?? "";
        }

        return new RouteUserInput
        {
            Raw = trimmed,
            ResolvedFilePath = ResolveExisting(trimmed),
        };
    }

    public static string? ResolveExisting(string path)
    {
        if (string.IsNullOrWhiteSpace(path))
        {
            return null;
        }

        try
        {
            if (path.IndexOfAny(Path.GetInvalidPathChars()) >= 0)
            {
                return null;
            }
        }
        catch (ArgumentException)
        {
            return null;
        }

        if (File.Exists(path))
        {
            return Path.GetFullPath(path);
        }

        string fromBase = Path.Combine(AppContext.BaseDirectory, path);
        if (File.Exists(fromBase))
        {
            return Path.GetFullPath(fromBase);
        }

        return null;
    }
}