using Microsoft.Extensions.Configuration;
using Moq;
using sh.actions.package_cleanup.Models;
using sh.actions.package_cleanup.Service;
using Xunit;

namespace sh.actions.package_cleanup.Tests.Service;

public class PackageServiceSemanticVersionTests
{
    private Mock<IConfiguration> _configurationMock;
    private Mock<IGiteaPackageService> _giteaPackageServiceMock;
    private IPackageService _packageService;

    private void SetupMocks()
    {
        _configurationMock = new Mock<IConfiguration>();
        _giteaPackageServiceMock = new Mock<IGiteaPackageService>();
        _packageService = new PackageService(_configurationMock.Object, _giteaPackageServiceMock.Object);
    }

    #region Version Detection Tests

    [Theory]
    [InlineData("1.0.0.0")]
    [InlineData("2.5.3.1")]
    [InlineData("10.20.30.100")]
    [InlineData("1.0.0")]
    [InlineData("2.5")]
    public void FilterPackagesToDelete_WithSemanticVersions_ShouldIdentifyCorrectly(string version)
    {
        // Arrange
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = version, Type = "docker", CreatedAt = DateTime.UtcNow }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Single prod version should not be deleted (CLEAN_PROD_VERSIONS=false by default)
        Assert.NotNull(result);
        Assert.Empty(result);
    }

    [Theory]
    [InlineData("1.0.0.0-dev")]
    [InlineData("2.5.3.1-alpha")]
    [InlineData("10.20.30.100-beta")]
    [InlineData("1.0.0-rc1")]
    [InlineData("2.5-preview")]
    public void FilterPackagesToDelete_WithSemanticVersionsAndSuffixes_ShouldIdentifyCorrectly(string version)
    {
        // Arrange
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = version, Type = "docker", CreatedAt = DateTime.UtcNow }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Single prerelease/dev should be kept
        Assert.NotNull(result);
        Assert.Empty(result);
    }

    #endregion

    #region Prod Release Tests - Semantic Versioning

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithOnlyProdReleases_ShouldReturnEmpty()
    {
        // Arrange - CLEAN_PROD_VERSIONS not set, defaults to false
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1.0.0.1", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-30) },
            new() { Id = 2, Name = "test", Version = "1.1.0.1", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-20) },
            new() { Id = 3, Name = "test", Version = "1.2.0.1", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-10) }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Prod releases should be protected by default (CLEAN_PROD_VERSIONS=false)
        Assert.Empty(result);
        Assert.DoesNotContain(result, p => p.Id == 1 || p.Id == 2 || p.Id == 3);
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithProdReleasesAndCleaningEnabled_ShouldDeleteOldest()
    {
        // Arrange
        SetupMocks();
        _configurationMock.Setup(c => c["CLEAN_PROD_VERSIONS"]).Returns("true");
        _configurationMock.Setup(c => c["KEEP_PROD_VERSIONS"]).Returns("2");
        
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1.0.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-30) },
            new() { Id = 2, Name = "test", Version = "1.1.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-20) },
            new() { Id = 3, Name = "test", Version = "2.0.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-10) },
            new() { Id = 4, Name = "test", Version = "2.1.0.0", Type = "docker", CreatedAt = DateTime.UtcNow }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should delete oldest 2 (1.0.0.0 and 1.1.0.0), keep newest 2 (2.0.0.0 and 2.1.0.0)
        Assert.Equal(2, result.Count);
        Assert.Contains(result, p => p.Id == 1);
        Assert.Contains(result, p => p.Id == 2);
        Assert.DoesNotContain(result, p => p.Id == 3 || p.Id == 4);
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithMultipleProdVersions_ShouldKeepNewest()
    {
        // Arrange
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1.0.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-30) },
            new() { Id = 2, Name = "test", Version = "1.0.1.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-20) },
            new() { Id = 3, Name = "test", Version = "2.0.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-10) },
            new() { Id = 4, Name = "test", Version = "2.1.0.0", Type = "docker", CreatedAt = DateTime.UtcNow }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Default is CLEAN_PROD_VERSIONS=false, so nothing should be deleted
        Assert.Empty(result);
    }

    #endregion

    #region Prerelease Tests - Semantic Versioning

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithPrereleaseVersions_ShouldKeepLatest()
    {
        // Arrange - Default KEEP_PRERELEASE_VERSIONS=3
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1.0.0-alpha", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-5) },
            new() { Id = 2, Name = "test", Version = "1.0.0-beta", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-4) },
            new() { Id = 3, Name = "test", Version = "1.0.0-rc1", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-3) },
            new() { Id = 4, Name = "test", Version = "1.0.0-preview", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-2) }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should delete oldest 1 (alpha, id=1), keep newest 3 (beta, rc1, preview)
        Assert.Single(result);
        Assert.Contains(result, p => p.Id == 1); // alpha is oldest, should be deleted
        Assert.DoesNotContain(result, p => p.Id == 2 || p.Id == 3 || p.Id == 4); // Keep newest 3
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithManyPrereleases_ShouldEnforceLimit()
    {
        // Arrange - Custom KEEP_PRERELEASE_VERSIONS=2
        SetupMocks();
        _configurationMock.Setup(c => c["KEEP_PRERELEASE_VERSIONS"]).Returns("2");
        
        var packages = new List<GiteaPackage>();
        for (int i = 0; i < 10; i++)
        {
            packages.Add(new GiteaPackage
            {
                Id = i,
                Name = "test",
                Version = $"1.0.0-beta{i}",
                Type = "docker",
                CreatedAt = DateTime.UtcNow.AddDays(-(10 - i))
            });
        }

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should delete 8 oldest, keep only 2 newest (Id=8,9)
        Assert.Equal(8, result.Count);
        Assert.DoesNotContain(result, p => p.Id >= 8);
        Assert.Contains(result, p => p.Id < 8);
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithMixedPrereleases_ShouldOrderByVersion()
    {
        // Arrange
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1.0.0-beta", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-10) },
            new() { Id = 2, Name = "test", Version = "2.0.0-beta", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-5) },
            new() { Id = 3, Name = "test", Version = "1.5.0-alpha", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-3) }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Default keep 3, so all should be kept
        Assert.Empty(result);
    }

    #endregion

    #region Dev Release Tests - Semantic Versioning

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithDevVersions_ShouldKeepLatest()
    {
        // Arrange - Default KEEP_DEV_VERSIONS=5
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1.0.0-dev", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-5) },
            new() { Id = 2, Name = "test", Version = "1.0.1-dev", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-4) },
            new() { Id = 3, Name = "test", Version = "2.0.0-dev", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-3) }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Default keep 5, so all 3 should be kept
        Assert.Empty(result);
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithManyDevReleases_ShouldEnforceLimit()
    {
        // Arrange - Custom KEEP_DEV_VERSIONS=3
        SetupMocks();
        _configurationMock.Setup(c => c["KEEP_DEV_VERSIONS"]).Returns("3");
        
        var packages = new List<GiteaPackage>();
        for (int i = 0; i < 10; i++)
        {
            packages.Add(new GiteaPackage
            {
                Id = i,
                Name = "test",
                Version = $"1.0.{i}-dev",
                Type = "docker",
                CreatedAt = DateTime.UtcNow.AddDays(-i)
            });
        }

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should delete 7 oldest, keep only 3 newest (Id=7,8,9 are newest by CreatedAt)
        Assert.Equal(7, result.Count);
        Assert.DoesNotContain(result, p => p.Id >= 7); // Keep newest 3
        Assert.Contains(result, p => p.Id < 7); // Delete oldest 7
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithManyDevReleases_ShouldIdentifyAll()
    {
        // Arrange
        SetupMocks();
        var packages = new List<GiteaPackage>();
        for (int i = 0; i < 20; i++)
        {
            packages.Add(new GiteaPackage
            {
                Id = i,
                Name = "test",
                Version = $"1.0.{i}-dev",
                Type = "docker",
                CreatedAt = DateTime.UtcNow.AddDays(-i)
            });
        }

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Default keep 5, so 15 should be deleted
        Assert.Equal(15, result.Count);
        Assert.DoesNotContain(result, p => p.Id >= 15); // Keep newest 5 (Id 15-19)
        Assert.Contains(result, p => p.Id < 15);
    }

    #endregion

    #region Mixed Release Types - Semantic Versioning

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithMixedReleaseTypes_ShouldSeparateAndCleanCorrectly()
    {
        // Arrange - CLEAN_PROD_VERSIONS=false, KEEP_PRERELEASE_VERSIONS=2, KEEP_DEV_VERSIONS=2
        SetupMocks();
        _configurationMock.Setup(c => c["KEEP_PRERELEASE_VERSIONS"]).Returns("2");
        _configurationMock.Setup(c => c["KEEP_DEV_VERSIONS"]).Returns("2");
        
        var packages = new List<GiteaPackage>
        {
            // Prod releases (should not be deleted - CLEAN_PROD_VERSIONS=false)
            new() { Id = 1, Name = "test", Version = "1.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-30) },
            new() { Id = 2, Name = "test", Version = "1.1.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-25) },
            // Prerelease (keep 2 newest)
            new() { Id = 3, Name = "test", Version = "1.2.0-alpha", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-20) },
            new() { Id = 4, Name = "test", Version = "1.2.0-beta", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-15) },
            new() { Id = 5, Name = "test", Version = "1.2.1-rc", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-10) },
            // Dev (keep 2 newest)
            new() { Id = 6, Name = "test", Version = "1.2.1-dev", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-5) },
            new() { Id = 7, Name = "test", Version = "1.2.2-dev", Type = "docker", CreatedAt = DateTime.UtcNow }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert
        Assert.Equal(1, result.Count); // Should delete 1 prerelease (alpha), 0 dev (keep both)
        Assert.DoesNotContain(result, p => p.Id <= 2); // Prod not deleted
        Assert.DoesNotContain(result, p => p.Id >= 6); // Keep 2 latest dev
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithLargeSet_ShouldHandleCorrectly()
    {
        // Arrange
        SetupMocks();
        _configurationMock.Setup(c => c["CLEAN_PROD_VERSIONS"]).Returns("false");
        _configurationMock.Setup(c => c["KEEP_PRERELEASE_VERSIONS"]).Returns("3");
        _configurationMock.Setup(c => c["KEEP_DEV_VERSIONS"]).Returns("5");
        
        var packages = new List<GiteaPackage>();
        
        // Add prod releases
        for (int i = 0; i < 5; i++)
        {
            packages.Add(new GiteaPackage
            {
                Id = i,
                Name = "test",
                Version = $"1.{i}.0",
                Type = "docker",
                CreatedAt = DateTime.UtcNow.AddDays(-(5 - i))
            });
        }
        
        // Add prerelease
        for (int i = 5; i < 15; i++)
        {
            packages.Add(new GiteaPackage
            {
                Id = i,
                Name = "test",
                Version = $"2.0.{i - 5}-beta",
                Type = "docker",
                CreatedAt = DateTime.UtcNow.AddDays(-(15 - i))
            });
        }
        
        // Add dev
        for (int i = 15; i < 30; i++)
        {
            packages.Add(new GiteaPackage
            {
                Id = i,
                Name = "test",
                Version = $"2.1.{i - 15}-dev",
                Type = "docker",
                CreatedAt = DateTime.UtcNow.AddDays(-(30 - i))
            });
        }

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert
        Assert.NotNull(result);
        // Prod releases should never be deleted
        Assert.DoesNotContain(result, p => p.Id < 5);
        // Should delete 7 oldest prerelease (keep 3 newest)
        var prereleaseDeleted = result.Where(p => p.Id >= 5 && p.Id < 15).ToList();
        Assert.Equal(7, prereleaseDeleted.Count);
        // Should delete 10 oldest dev (keep 5 newest)
        var devDeleted = result.Where(p => p.Id >= 15).ToList();
        Assert.Equal(10, devDeleted.Count);
    }

    #endregion

    #region Edge Cases - Semantic Versioning

    [Theory]
    [InlineData("0.0.0.0")]
    [InlineData("99.99.99.99")]
    [InlineData("100.0.0.0")] // Boundary case - might be detected as date version
    public void FilterPackagesToDeleteBySemanticVersion_WithBoundaryVersions_ShouldHandleCorrectly(string version)
    {
        // Arrange
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = version, Type = "docker", CreatedAt = DateTime.UtcNow }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should not throw, and boundary versions should be handled properly
        Assert.NotNull(result);
        // Versions 0.0.0.0 and 99.99.99.99 are semantic, 100.0.0.0 is likely treated as date (will fail date validation)
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithVersionsHavingDifferentLengths_ShouldHandleCorrectly()
    {
        // Arrange
        SetupMocks();
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-5) },
            new() { Id = 2, Name = "test", Version = "1.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-4) },
            new() { Id = 3, Name = "test", Version = "1.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-3) },
            new() { Id = 4, Name = "test", Version = "1.0.0.0", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-2) }
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should not throw and should not delete any prod versions
        Assert.NotNull(result);
        // CLEAN_PROD_VERSIONS=false by default, so all versions should be kept
        // Id=1 is invalid (only 1 component), ids 2-4 are valid but prod
        var validVersions = new[] { 2, 3, 4 };
        foreach (var id in validVersions)
        {
            Assert.DoesNotContain(result, p => p.Id == id);
        }
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithZeroKeepCount_ShouldKeepAll()
    {
        // Arrange - KEEP_DEV_VERSIONS=0 means keep all
        SetupMocks();
        _configurationMock.Setup(c => c["KEEP_DEV_VERSIONS"]).Returns("0");
        
        var packages = new List<GiteaPackage>();
        for (int i = 0; i < 10; i++)
        {
            packages.Add(new GiteaPackage
            {
                Id = i,
                Name = "test",
                Version = $"1.0.{i}-dev",
                Type = "docker",
                CreatedAt = DateTime.UtcNow.AddDays(-i)
            });
        }

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should keep all (0 means infinite/keep all)
        Assert.Empty(result);
        Assert.DoesNotContain(result, p => p.Id >= 0); // No packages should be deleted
    }

    [Fact]
    public void FilterPackagesToDeleteBySemanticVersion_WithInvalidConfigValues_ShouldUseDefaults()
    {
        // Arrange - Set invalid config values
        SetupMocks();
        _configurationMock.Setup(c => c["KEEP_DEV_VERSIONS"]).Returns("invalid");
        _configurationMock.Setup(c => c["CLEAN_PROD_VERSIONS"]).Returns("maybe");
        
        var packages = new List<GiteaPackage>
        {
            new() { Id = 1, Name = "test", Version = "1.0.0-dev", Type = "docker", CreatedAt = DateTime.UtcNow.AddDays(-10) },
            new() { Id = 2, Name = "test", Version = "1.0.1-dev", Type = "docker", CreatedAt = DateTime.UtcNow },
        };

        // Act
        var result = _packageService.FilterPackagesToDelete(packages);

        // Assert - Should use defaults (KEEP_DEV_VERSIONS=5, CLEAN_PROD_VERSIONS=false)
        // With 2 packages and keep 5, no deletion should happen
        Assert.Empty(result);
        Assert.DoesNotContain(result, p => p.Id == 1 || p.Id == 2);
    }

    #endregion
}