namespace KArtSell.Integration.Tests.ApprovalWorkflow;

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Xunit;
using KArtSell.BuildingBlocks.Time;
using KArtSell.Modules.ModelOperations.ApprovalWorkflow;

public class ApprovalWorkflowTests : IAsyncLifetime
{
    private readonly string _connectionString;
    private readonly ApprovalSql _sql;
    private readonly ApprovalPolicy _policy;
    private readonly IOutbox _outbox;

    public ApprovalWorkflowTests()
    {
        _connectionString = "Host=localhost;Port=5432;Database=kartselldb;Username=kartsell;Password=kartsell4321@!";
        _sql = new ApprovalSql(_connectionString, new SystemClock());
        _policy = new ApprovalPolicy(new SystemClock());
        _outbox = new InMemoryOutbox();
    }

    public async Task InitializeAsync()
    {
        // Ensure database is ready
        await Task.CompletedTask;
    }

    public async Task DisposeAsync()
    {
        await Task.CompletedTask;
    }

    [Fact]
    public void CanCreateProposal_WithMakerRole_ReturnsTrue()
    {
        // Arrange
        var makerEmail = "maker@company.com";
        var makerRole = "Maker";

        // Act
        var result = _policy.CanCreateProposal(makerEmail, makerRole);

        // Assert
        Assert.True(result);
    }

    [Fact]
    public void CanCreateProposal_WithoutMakerRole_ReturnsFalse()
    {
        // Arrange
        var email = "user@company.com";
        var role = "Viewer";

        // Act
        var result = _policy.CanCreateProposal(email, role);

        // Assert
        Assert.False(result);
    }

    [Fact]
    public void CanApproveApproval_WithDifferentChecker_ReturnsTrue()
    {
        // Arrange
        var maker = "maker@company.com";
        var checker = "checker@company.com";
        var proposal = new ApprovalProposal { CreatedBy = maker, Status = ApprovalStatus.Proposed };

        // Act
        var result = _policy.CanApproveApproval(proposal, checker, maker);

        // Assert
        Assert.True(result);
    }

    [Fact]
    public void CanApproveApproval_WithSameMaker_ReturnsFalse()
    {
        // Arrange
        var maker = "maker@company.com";
        var proposal = new ApprovalProposal { CreatedBy = maker, Status = ApprovalStatus.Proposed };

        // Act
        var result = _policy.CanApproveApproval(proposal, maker, maker);

        // Assert
        Assert.False(result);
    }

    [Fact]
    public void CreateProposal_SetsCorrectDefaults()
    {
        // Arrange
        var modelId = Guid.NewGuid();
        var maker = "maker@company.com";
        var justification = "Model passed OOS testing";
        var effectiveAt = DateOnly.FromDateTime(DateTime.UtcNow.AddDays(7));

        // Act
        var proposal = _policy.CreateProposal(modelId, maker, justification, effectiveAt);

        // Assert
        Assert.Equal(modelId, proposal.ModelId);
        Assert.Equal(maker, proposal.CreatedBy);
        Assert.Equal(ApprovalStatus.Draft, proposal.Status);
        Assert.Equal(justification, proposal.Justification);
        Assert.Equal(effectiveAt, proposal.EffectiveAt);
    }

    [Fact]
    public void ProposeApproval_TransitionsToProposed()
    {
        // Arrange
        var proposal = new ApprovalProposal
        {
            Id = Guid.NewGuid(),
            CreatedBy = "maker@company.com",
            Status = ApprovalStatus.Draft,
            Justification = "Test",
            EffectiveAt = DateOnly.FromDateTime(DateTime.UtcNow)
        };

        // Act
        var updated = _policy.ProposeApproval(proposal, "maker@company.com");

        // Assert
        Assert.Equal(ApprovalStatus.Proposed, updated.Status);
        Assert.NotNull(updated.ProposedAt);
    }

    [Fact]
    public void ApproveApproval_AddsEvidence()
    {
        // Arrange
        var proposal = new ApprovalProposal
        {
            Id = Guid.NewGuid(),
            CreatedBy = "maker@company.com",
            Status = ApprovalStatus.Proposed,
            Evidence = [],
            CorrelationId = Guid.NewGuid()
        };
        var evidence = new List<EvidenceItem>
        {
            new() { Type = "PBO_SCORE", Url = "s3://pbo-0.95.json", Comment = "Verified" }
        };

        // Act
        var updated = _policy.ApproveApproval(proposal, "checker@company.com", "Looks good", evidence);

        // Assert
        Assert.Equal(ApprovalStatus.Approved, updated.Status);
        Assert.Equal("checker@company.com", updated.ApprovedBy);
        Assert.Single(updated.Evidence);
        Assert.Equal("PBO_SCORE", updated.Evidence[0].EvidenceType);
    }

    [Fact]
    public async Task InsertAndRetrieveProposal_RoundTrips()
    {
        // Arrange
        var id = Guid.NewGuid();
        var modelId = Guid.NewGuid();
        var correlationId = Guid.NewGuid();

        // Act
        await _sql.InsertProposalAsync(
            id,
            modelId,
            "Draft",
            "maker@company.com",
            "Test justification",
            DateOnly.FromDateTime(DateTime.UtcNow),
            DateTimeOffset.UtcNow,
            correlationId);

        var retrieved = await _sql.GetProposalByIdAsync(id, DateTimeOffset.UtcNow.AddDays(1));

        // Assert
        Assert.NotNull(retrieved);
        Assert.Equal(id, retrieved.Id);
        Assert.Equal(modelId, retrieved.ModelId);
        Assert.Equal(correlationId, retrieved.CorrelationId);
    }
}

public class InMemoryOutbox : IOutbox
{
    public List<(string EventType, Guid CorrelationId, object Data)> Events { get; } = [];

    public Task PublishAsync(string eventType, Guid correlationId, object data)
    {
        Events.Add((eventType, correlationId, data));
        return Task.CompletedTask;
    }
}