using MAF1.Tools;
using MAF1.Utils;
using Microsoft.Extensions.Configuration;

namespace MAF1.Route;

/// <summary>
/// 命令行宿主：读配置和图 JSON，用 MAF WithHandoff 按方案 C 跑路由。
/// </summary>
internal static class CliHost
{
    public static async Task RunAsync(string[] args)
    {
        if (args.Length > 0 && args[0] is "-h" or "--help")
        {
            PrintUsage();
            return;
        }

        IConfiguration config = new ConfigurationBuilder()
            .SetBasePath(AppContext.BaseDirectory)
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: false)
            .AddEnvironmentVariables()
            .Build();

        string graphPath = args.Length > 0 ? args[0] : Path.Combine("Graphs", "city-weather.json");
        string? resolvedGraph = ResolveExisting(graphPath);
        if (resolvedGraph is null)
        {
            Console.WriteLine($"找不到路由图：{graphPath}");
            PrintUsage();
            return;
        }

        RouteGraph graph = RouteGraph.LoadFile(resolvedGraph);
        Console.WriteLine($"路由图: {resolvedGraph}");
        Console.WriteLine();

        RouteUserInput input = RouteUserInput.ReadFromConsole(graph);
        if (!input.HasRaw)
        {
            Console.WriteLine("没有输入，已取消。");
            return;
        }

        Console.WriteLine($"本次输入: {input.Describe()}");
        Console.WriteLine();

        AgentFactory factory = new(AgentFactory.Load(config));
        WeatherOptions weatherOptions = config.GetSection("Weather").Get<WeatherOptions>() ?? new WeatherOptions();
        using HttpClient http = WeatherTools.CreateHttpClient();
        WeatherTools weatherTools = new(weatherOptions, http);
        Console.WriteLine($"天气数据源: {weatherOptions.Provider}");
        Console.WriteLine();

        await RouteOrchestrator.RunAsync(factory, weatherTools, graph, input);
    }

    private static string? ResolveExisting(string path)
        => RouteUserInput.ResolveExisting(path);

    private static void PrintUsage()
    {
        Console.WriteLine(
            """
            命令行路由（方案 C + MAF WithHandoff）:
              dotnet run --project MAF1.Route
              dotnet run --project MAF1.Route -- Graphs/city-weather.json
              dotnet run --project MAF1.Route -- Graphs/nodes-only.json

            启动后在控制台输入即可，专家自己判断：
              Data/cities.txt
              帮我查成都和杭州的天气
              明天去上海出差
            直接回车则用图节点 config 里的默认 filePath。

            city-weather.json：专家之间仍是抽城市→天气；主管若认定用户已给出城市名，可直接交给天气。
            nodes-only.json 无边：主管可把对话直接交给白名单里任一专家。

            对照工作流（不是 Handoff）:
              dotnet run --project MAF1 -- node Data/cities.txt
            """);
    }
}