using Moq;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Instances;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Repositories;
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
using ZB.MOM.WW.ScadaBridge.TemplateEngine.Services;

namespace ZB.MOM.WW.ScadaBridge.TemplateEngine.Tests.Services;

public class SiteServiceTests
{
    private readonly Mock<ISiteRepository> _repoMock = new();
    private readonly Mock<IAuditService> _auditMock = new();
    private readonly SiteService _sut;

    /// <summary>Initializes the test class with a mocked repository and the service under test.</summary>
    public SiteServiceTests()
    {
        _sut = new SiteService(_repoMock.Object, _auditMock.Object);
    }

    /// <summary>Verifies that creating a site with valid input succeeds.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task CreateSite_ValidInput_ReturnsSuccess()
    {
        _repoMock.Setup(r => r.GetSiteByIdentifierAsync("SITE-001", It.IsAny<CancellationToken>()))
            .ReturnsAsync((Site?)null);
        _repoMock.Setup(r => r.SaveChangesAsync(It.IsAny<CancellationToken>()))
            .ReturnsAsync(1);

        var result = await _sut.CreateSiteAsync("Plant Alpha", "SITE-001", "Main plant", "admin");

        Assert.True(result.IsSuccess);
        Assert.Equal("Plant Alpha", result.Value.Name);
        Assert.Equal("SITE-001", result.Value.SiteIdentifier);
    }

    /// <summary>Verifies that creating a site with a duplicate identifier fails.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task CreateSite_DuplicateIdentifier_ReturnsFailure()
    {
        _repoMock.Setup(r => r.GetSiteByIdentifierAsync("SITE-001", It.IsAny<CancellationToken>()))
            .ReturnsAsync(new Site("Existing", "SITE-001") { Id = 1 });

        var result = await _sut.CreateSiteAsync("New", "SITE-001", null, "admin");

        Assert.True(result.IsFailure);
        Assert.Contains("already exists", result.Error);
    }

    /// <summary>Verifies that creating a site with an empty name fails.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task CreateSite_EmptyName_ReturnsFailure()
    {
        var result = await _sut.CreateSiteAsync("", "SITE-001", null, "admin");

        Assert.True(result.IsFailure);
        Assert.Contains("required", result.Error);
    }

    /// <summary>Verifies that deleting a site that has instances fails.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task DeleteSite_WithInstances_ReturnsFailure()
    {
        _repoMock.Setup(r => r.GetSiteByIdAsync(1, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new Site("Plant", "SITE-001") { Id = 1 });
        _repoMock.Setup(r => r.GetInstancesBySiteIdAsync(1, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<Instance>
            {
                new("Inst1") { Id = 1, SiteId = 1 },
                new("Inst2") { Id = 2, SiteId = 1 }
            });

        var result = await _sut.DeleteSiteAsync(1, "admin");

        Assert.True(result.IsFailure);
        Assert.Contains("2 instance(s)", result.Error);
    }

    /// <summary>Verifies that deleting a site without instances succeeds.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task DeleteSite_NoInstances_Success()
    {
        _repoMock.Setup(r => r.GetSiteByIdAsync(1, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new Site("Plant", "SITE-001") { Id = 1 });
        _repoMock.Setup(r => r.GetInstancesBySiteIdAsync(1, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<Instance>());
        _repoMock.Setup(r => r.SaveChangesAsync(It.IsAny<CancellationToken>()))
            .ReturnsAsync(1);

        var result = await _sut.DeleteSiteAsync(1, "admin");

        Assert.True(result.IsSuccess);
    }

    /// <summary>
    /// Review 2026-10-21 08/C1: SiteService must not offer a data-connection create/update
    /// that audits the raw <c>DataConnection</c> entity — its Primary/BackupConfiguration
    /// can embed protocol credentials, which would land in plaintext in the indefinitely
    /// retained config audit. The Management Service path (which audits the scrubbed
    /// public shape) is the only writer.
    /// </summary>
    [Theory]
    [InlineData("CreateDataConnectionAsync")]
    [InlineData("UpdateDataConnectionAsync")]
    public void SiteService_HasNoRawDataConnectionWriter(string method)
    {
        Assert.Null(typeof(SiteService).GetMethod(method));
    }

    /// <summary>Verifies that updating a site with valid input succeeds.</summary>
    /// <returns>A task that represents the asynchronous operation.</returns>
    [Fact]
    public async Task UpdateSite_ValidInput_Success()
    {
        _repoMock.Setup(r => r.GetSiteByIdAsync(1, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new Site("Old", "S1") { Id = 1 });
        _repoMock.Setup(r => r.SaveChangesAsync(It.IsAny<CancellationToken>()))
            .ReturnsAsync(1);

        var result = await _sut.UpdateSiteAsync(1, "New Name", "New desc", "admin");

        Assert.True(result.IsSuccess);
        Assert.Equal("New Name", result.Value.Name);
    }
}