using FluentAssertions;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using StellaOps.Concelier.Persistence.Postgres.Models;
using StellaOps.Concelier.Persistence.Postgres;
using StellaOps.Concelier.Persistence.Postgres.Repositories;
using Xunit;

using StellaOps.TestKit;
namespace StellaOps.Concelier.Persistence.Tests;

/// <summary>
/// Integration tests for <see cref="SourceStateRepository"/>.
/// </summary>
[Collection(ConcelierPostgresCollection.Name)]
public sealed class SourceStateRepositoryTests : IAsyncLifetime
{
    private readonly ConcelierPostgresFixture _fixture;
    private readonly ConcelierDataSource _dataSource;
    private readonly SourceRepository _sourceRepository;
    private readonly SourceStateRepository _repository;

    public SourceStateRepositoryTests(ConcelierPostgresFixture fixture)
    {
        _fixture = fixture;

        var options = fixture.CreateOptions();
        _dataSource = new ConcelierDataSource(Options.Create(options), NullLogger<ConcelierDataSource>.Instance);
        _sourceRepository = new SourceRepository(_dataSource, NullLogger<SourceRepository>.Instance);
        _repository = new SourceStateRepository(_dataSource, NullLogger<SourceStateRepository>.Instance);
    }

    public ValueTask InitializeAsync() => new(_fixture.TruncateAllTablesAsync());
    public async ValueTask DisposeAsync() => await _dataSource.DisposeAsync();

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task UpsertAsync_ShouldCreateNewState()
    {
        // Arrange
        var source = await CreateTestSourceAsync();
        var state = new SourceStateEntity
        {
            Id = Guid.NewGuid(),
            SourceId = source.Id,
            LastSyncAt = DateTimeOffset.UtcNow,
            LastSuccessAt = DateTimeOffset.UtcNow,
            Cursor = """{"lastModified": "2025-01-01T00:00:00Z"}""",
            ErrorCount = 0,
            SyncCount = 1
        };

        // Act
        var result = await _repository.UpsertAsync(state);

        // Assert
        result.Should().NotBeNull();
        result.SourceId.Should().Be(source.Id);
        result.Cursor.Should().Contain("lastModified");
        result.SyncCount.Should().Be(1);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task GetBySourceIdAsync_ShouldReturnState_WhenExists()
    {
        // Arrange
        var source = await CreateTestSourceAsync();
        var state = new SourceStateEntity
        {
            Id = Guid.NewGuid(),
            SourceId = source.Id,
            LastSyncAt = DateTimeOffset.UtcNow
        };
        await _repository.UpsertAsync(state);

        // Act
        var result = await _repository.GetBySourceIdAsync(source.Id);

        // Assert
        result.Should().NotBeNull();
        result!.SourceId.Should().Be(source.Id);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task GetBySourceIdAsync_ShouldReturnNull_WhenNotExists()
    {
        // Act
        var result = await _repository.GetBySourceIdAsync(Guid.NewGuid());

        // Assert
        result.Should().BeNull();
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task UpsertAsync_ShouldUpdateExistingState()
    {
        // Arrange
        var source = await CreateTestSourceAsync();
        var state = new SourceStateEntity
        {
            Id = Guid.NewGuid(),
            SourceId = source.Id,
            LastSyncAt = DateTimeOffset.UtcNow.AddHours(-1),
            ErrorCount = 0,
            SyncCount = 1
        };
        await _repository.UpsertAsync(state);

        // Create updated version (same source_id triggers update)
        var updatedState = new SourceStateEntity
        {
            Id = Guid.NewGuid(), // Different ID but same source_id
            SourceId = source.Id,
            LastSyncAt = DateTimeOffset.UtcNow,
            LastSuccessAt = DateTimeOffset.UtcNow,
            Cursor = """{"page": 10}""",
            ErrorCount = 0,
            SyncCount = 2
        };

        // Act
        var result = await _repository.UpsertAsync(updatedState);

        // Assert
        result.Should().NotBeNull();
        result.LastSuccessAt.Should().NotBeNull();
        result.Cursor.Should().Contain("page");
        result.SyncCount.Should().Be(2);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task UpsertAsync_ShouldTrackErrorCount()
    {
        // Arrange
        var source = await CreateTestSourceAsync();
        var state = new SourceStateEntity
        {
            Id = Guid.NewGuid(),
            SourceId = source.Id,
            LastSyncAt = DateTimeOffset.UtcNow,
            ErrorCount = 3,
            LastError = "Connection failed"
        };

        // Act
        var result = await _repository.UpsertAsync(state);

        // Assert
        result.Should().NotBeNull();
        result.ErrorCount.Should().Be(3);
        result.LastError.Should().Be("Connection failed");
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task UpsertAsync_ShouldTrackSyncMetrics()
    {
        // Arrange
        var source = await CreateTestSourceAsync();
        var syncTime = DateTimeOffset.UtcNow;
        var state = new SourceStateEntity
        {
            Id = Guid.NewGuid(),
            SourceId = source.Id,
            LastSyncAt = syncTime,
            LastSuccessAt = syncTime,
            SyncCount = 100,
            ErrorCount = 2
        };

        // Act
        var result = await _repository.UpsertAsync(state);

        // Assert
        result.Should().NotBeNull();
        result.SyncCount.Should().Be(100);
        result.LastSyncAt.Should().BeCloseTo(syncTime, TimeSpan.FromSeconds(1));
        result.LastSuccessAt.Should().BeCloseTo(syncTime, TimeSpan.FromSeconds(1));
    }

    private async Task<SourceEntity> CreateTestSourceAsync()
    {
        var id = Guid.NewGuid();
        var key = $"source-{id:N}"[..20];
        var source = new SourceEntity
        {
            Id = id,
            Key = key,
            Name = $"Test Source {key}",
            SourceType = "nvd",
            Priority = 100,
            Enabled = true
        };
        return await _sourceRepository.UpsertAsync(source);
    }
}