using Deal.Contracts.Integrations.Models;
using Deal.Grpc.Ai;
using Deal.Infrastructure.Data;
using Deal.Infrastructure.Integrations.Exceptions;
using Deal.Infrastructure.Integrations.Models;
using Deal.Infrastructure.Integrations.Options;
using Deal.Infrastructure.Integrations.Services;
using Deal.Modules.Settings.Application.Abstractions;
using Deal.Modules.Settings.Application.Models;
using Deal.Modules.Tenants.Application.Services;
using Deal.SharedKernel.Tenants.Models;
using Deal.Tests.Unit.Grpc;
using Deal.Tests.Unit.Modules.Settings;
using Deal.Tests.Unit.Modules.Tenants;
using Deal.Tests.Unit.Support;
using Microsoft.Extensions.Logging.Abstractions;
using Deal.Contracts.Integrations.Abstractions;
using Deal.SharedKernel.Tenants.Abstractions;

namespace Deal.Tests.Unit.Contracts;

/// <summary>
/// Тесты gRPC-адаптера IAiTools к ai-service
/// </summary>
[Collection("MlGrpcTests")]
public sealed class GrpcAiToolsTests
{
    // Id тенанта сценариев строкой (формат N) — ожидаемое значение metadata tenant-id.
    private const string TenantIdValue = "fedcba9876543210fedcba9876543210";

    private static readonly Guid TenantGuid = Guid.Parse(TenantIdValue);

    [Fact]
    public async Task GenerateKeywordsAsync_MapsKeywordsAndSendsProviderConfigAndMetadata()
    {
        await AiGrpcTestHost.RunAsync(AiGrpcTestHost.DefaultToken, new RecordingAiService(), async (port, service) =>
        {
            var reply = new GenerateKeywordsReply { Usage = new Usage { Prompt = 300, Completion = 60, Total = 360 } };
            reply.Keywords.Add("python разработка");
            reply.Keywords.Add("telegram каналы");
            service.GenerateKeywordsReply = reply;
            FakeSettingsStore settings = new();
            ISecretCipher cipher = TestCiphers.New();
            FakeTenantLimitStore limits = new();

            IAiTools tools = CreateTools(port, settings, cipher, limits);
            AiGenerateKeywordsResultDto result = await tools.GenerateKeywordsAsync("Бэкенд-разработка на Python", CancellationToken.None);

            Assert.True(result.Ok);
            Assert.Equal(new[] { "python разработка", "telegram каналы" }, result.Keywords);
            Assert.Null(result.Error);

            Assert.NotNull(service.LastKeywords);
            Assert.Equal("Бэкенд-разработка на Python", service.LastKeywords!.Description);
            Assert.Equal("deepseek", service.LastKeywords.ProviderConfig.ProviderId);
            Assert.Equal(TenantIdValue, Assert.Single(service.RequestTenantIds));
            Assert.Equal(AiGrpcTestHost.DefaultToken, Assert.Single(service.RequestTokens));
            Assert.Equal("{\"prompt\":300,\"completion\":60,\"total\":360}", settings.GetStoredJson(SettingsKeys.AiTokenUsage));
            Assert.Equal(360, limits.UsedTokens(TenantGuid));
        });
    }

    [Fact]
    public async Task GenerateKeywordsAsync_Unavailable_ReturnsSoftErrorWithKeywordsEmpty()
    {
        await AiGrpcTestHost.RunAsync(AiGrpcTestHost.DefaultToken, new RecordingAiService(), async (port, service) =>
        {
            service.KeywordsUnavailable = true;
            IAiTools tools = CreateTools(port, new FakeSettingsStore(), TestCiphers.New());

            AiGenerateKeywordsResultDto result = await tools.GenerateKeywordsAsync("описание", CancellationToken.None);

            Assert.False(result.Ok);
            Assert.Empty(result.Keywords);
            Assert.NotNull(result.Error);
            Assert.Contains("не ответил корректно", result.Error);
        });
    }

    [Fact]
    public async Task EvaluateFitAsync_MapsReplyAndSendsTaskFields()
    {
        await AiGrpcTestHost.RunAsync(AiGrpcTestHost.DefaultToken, new RecordingAiService(), async (port, service) =>
        {
            service.EvaluateFitReply = new EvaluateFitReply
            {
                Fit = false,
                Reason = "другая сфера",
                Usage = new Usage { Prompt = 200, Completion = 10, Total = 210 },
            };
            FakeTenantLimitStore limits = new();
            IAiTools tools = CreateTools(port, new FakeSettingsStore(), TestCiphers.New(), limits);

            AiEvaluateFitResultDto result = await tools.EvaluateFitAsync(
                "Ищу дизайнера для лендинга", "Разработка сайтов на Python", new[] { "python", "бэкенд" }, CancellationToken.None);

            Assert.False(result.Fit);
            Assert.Equal("другая сфера", result.Reason);
            Assert.NotNull(service.LastFit);
            Assert.Equal("Ищу дизайнера для лендинга", service.LastFit!.Text);
            Assert.Equal("Разработка сайтов на Python", service.LastFit.Description);
            Assert.Equal(new[] { "python", "бэкенд" }, service.LastFit.Keywords);
            Assert.Equal("deepseek", service.LastFit.ProviderConfig.ProviderId);
            Assert.Equal(TenantIdValue, Assert.Single(service.RequestTenantIds));
            Assert.Equal(AiGrpcTestHost.DefaultToken, Assert.Single(service.RequestTokens));
            Assert.Equal(210, limits.UsedTokens(TenantGuid));
        });
    }

    [Fact]
    public async Task EvaluateFitAsync_Unavailable_ThrowsAiUnavailable()
    {
        await AiGrpcTestHost.RunAsync(AiGrpcTestHost.DefaultToken, new RecordingAiService(), async (port, service) =>
        {
            service.FitUnavailable = true;
            IAiTools tools = CreateTools(port, new FakeSettingsStore(), TestCiphers.New());

            await Assert.ThrowsAsync<AiUnavailableException>(
                () => tools.EvaluateFitAsync("текст", "описание", new[] { "ключ" }, CancellationToken.None));
        });
    }

    // Создаёт GrpcAiTools к хосту-фейку на эфемерном порту в tenant-контексте теста.
    // port: Порт хоста-фейка ai-service.
    // settings: KV-хранилище тенанта (дефолты при пустом).
    // cipher: Шифр секретов (расшифровка apiKey).
    // limits: Фейк-хранилище лимитов (списание usage; при null — собственный экземпляр).
    // Возвращает: Экземпляр GrpcAiTools.
    private static GrpcAiTools CreateTools(
        int port,
        FakeSettingsStore settings,
        ISecretCipher cipher,
        FakeTenantLimitStore? limits = null)
    {
        ITenantContext tenantContext = new TenantContext();
        tenantContext.SetTenant(new TenantId(TenantIdValue));
        var connection = new AiGrpcConnection(new AiServiceOptions { UseLocal = false, Endpoint = $"http://127.0.0.1:{port}" });
        return new GrpcAiTools(
            tenantContext,
            connection,
            new AiProviderConfigBuilder(settings, cipher),
            new TokenUsageRecorder(settings, limits ?? new FakeTenantLimitStore(), tenantContext, new TokenUsageEventService(new TestTokenUsageEventStore().Store)),
            NullLogger<GrpcAiTools>.Instance);
    }
}