using System;
using System.Collections.Generic;
using System.Text.Json;
using ModelContextProtocol;
using ModelContextProtocol.Protocol;

namespace Sozsoft.Mcp.Tools;

/// <summary>
/// Servis sonucunu arac sonucuna cevirir. Deger SDK'nin donus degerini yazdigi bicimde
/// (<see cref="McpJsonUtilities.DefaultOptions"/>) JSON metnidir. <see cref="McpProblem"/> hata
/// sonucudur (<c>IsError</c>): istisna atilmadan modele ulasir, model nedeni okuyup girdiyi duzeltir.
/// </summary>
internal static class McpToolResult
{
    /// <summary>Degeri olmayan araclarin (not ekleme, silme) basari cevabi.</summary>
    private const string Done = "ok";

    public static CallToolResult From<T>(McpOutcome<T> outcome)
        => outcome.TryGetValue(out var value, out var problem)
            ? Text(JsonSerializer.Serialize(value, McpJsonUtilities.DefaultOptions))
            : Error(problem.Message);

    public static CallToolResult From(McpProblem? problem)
        => problem is null ? Text(Done) : Error(problem.Message);

    /// <summary>Degeri metin disinda icerik (resim) tasiyan araclar icin.</summary>
    public static CallToolResult From<T>(McpOutcome<T> outcome, Func<T, IList<ContentBlock>> toContent)
        => outcome.TryGetValue(out var value, out var problem)
            ? new CallToolResult { Content = toContent(value) }
            : Error(problem.Message);

    public static CallToolResult Error(string message)
        => new() { IsError = true, Content = [new TextContentBlock { Text = message }] };

    private static CallToolResult Text(string text)
        => new() { Content = [new TextContentBlock { Text = text }] };
}