using Microsoft.EntityFrameworkCore;
using StellaOps.Scanner.Triage.Entities;
using StellaOps.TestKit;
using Xunit;

namespace StellaOps.Scanner.Triage.Tests;

/// <summary>
/// Integration tests for the Triage schema using Testcontainers.
/// </summary>
[Collection("triage-postgres")]
public sealed class TriageSchemaIntegrationTests : IAsyncLifetime
{
    private readonly TriagePostgresFixture _fixture;
    private TriageDbContext? _context;

    public TriageSchemaIntegrationTests(TriagePostgresFixture fixture)
    {
        _fixture = fixture;
    }

    public ValueTask InitializeAsync()
    {
        var optionsBuilder = new DbContextOptionsBuilder<TriageDbContext>()
            .UseNpgsql(_fixture.ConnectionString);

        _context = new TriageDbContext(optionsBuilder.Options);
        return ValueTask.CompletedTask;
    }

    public async ValueTask DisposeAsync()
    {
        if (_context != null)
        {
            await _context.DisposeAsync();
        }
    }

    private TriageDbContext Context => _context ?? throw new InvalidOperationException("Context not initialized");

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Schema_Creates_Successfully()
    {
        // Arrange / Act
        await Context.Database.EnsureCreatedAsync();

        // Assert - verify tables exist by querying the metadata
        var findingsCount = await Context.Findings.CountAsync();
        var decisionsCount = await Context.Decisions.CountAsync();

        Assert.Equal(0, findingsCount);
        Assert.Equal(0, decisionsCount);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Can_Create_And_Query_TriageFinding()
    {
        // Arrange
        await Context.Database.EnsureCreatedAsync();

        var now = DateTimeOffset.UtcNow;
        var finding = new TriageFinding
        {
            Id = Guid.NewGuid(),
            AssetId = Guid.NewGuid(),
            AssetLabel = "prod/api-gateway:1.2.3",
            Purl = "pkg:npm/lodash@4.17.20",
            CveId = "CVE-2021-23337",
            FirstSeenAt = now,
            LastSeenAt = now,
            UpdatedAt = now
        };

        // Act
        Context.Findings.Add(finding);
        await Context.SaveChangesAsync();

        // Assert
        var retrieved = await Context.Findings.FirstOrDefaultAsync(f => f.Id == finding.Id);
        Assert.NotNull(retrieved);
        Assert.Equal(finding.AssetLabel, retrieved.AssetLabel);
        Assert.Equal(finding.Purl, retrieved.Purl);
        Assert.Equal(finding.CveId, retrieved.CveId);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Can_Create_TriageDecision_With_Finding()
    {
        // Arrange
        await Context.Database.EnsureCreatedAsync();

        var now = DateTimeOffset.UtcNow;
        var finding = new TriageFinding
        {
            Id = Guid.NewGuid(),
            AssetId = Guid.NewGuid(),
            AssetLabel = "prod/api-gateway:1.2.3",
            Purl = "pkg:npm/lodash@4.17.20",
            CveId = "CVE-2021-23337",
            FirstSeenAt = now,
            LastSeenAt = now,
            UpdatedAt = now
        };

        Context.Findings.Add(finding);
        await Context.SaveChangesAsync();

        var decision = new TriageDecision
        {
            Id = Guid.NewGuid(),
            FindingId = finding.Id,
            Kind = TriageDecisionKind.MuteReach,
            ReasonCode = "NOT_REACHABLE",
            Note = "Code path is not reachable per RichGraph analysis",
            ActorSubject = "user:test@example.com",
            ActorDisplay = "Test User",
            CreatedAt = now
        };

        // Act
        Context.Decisions.Add(decision);
        await Context.SaveChangesAsync();

        // Assert
        var retrieved = await Context.Decisions
            .Include(d => d.Finding)
            .FirstOrDefaultAsync(d => d.Id == decision.Id);

        Assert.NotNull(retrieved);
        Assert.Equal(TriageDecisionKind.MuteReach, retrieved.Kind);
        Assert.Equal("NOT_REACHABLE", retrieved.ReasonCode);
        Assert.NotNull(retrieved.Finding);
        Assert.Equal(finding.Purl, retrieved.Finding!.Purl);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Can_Create_TriageRiskResult_With_Finding()
    {
        // Arrange
        await Context.Database.EnsureCreatedAsync();

        var now = DateTimeOffset.UtcNow;
        var finding = new TriageFinding
        {
            Id = Guid.NewGuid(),
            AssetId = Guid.NewGuid(),
            AssetLabel = "prod/api-gateway:1.2.3",
            Purl = "pkg:npm/lodash@4.17.20",
            CveId = "CVE-2021-23337",
            FirstSeenAt = now,
            LastSeenAt = now,
            UpdatedAt = now
        };

        Context.Findings.Add(finding);
        await Context.SaveChangesAsync();

        var riskResult = new TriageRiskResult
        {
            Id = Guid.NewGuid(),
            FindingId = finding.Id,
            PolicyId = "security-policy-v1",
            PolicyVersion = "1.0.0",
            InputsHash = "abc123def456",
            Score = 75,
            Verdict = TriageVerdict.Block,
            Lane = TriageLane.Blocked,
            Why = "High-severity CVE with network exposure",
            ComputedAt = now
        };

        // Act
        Context.RiskResults.Add(riskResult);
        await Context.SaveChangesAsync();

        // Assert
        var retrieved = await Context.RiskResults
            .Include(r => r.Finding)
            .FirstOrDefaultAsync(r => r.Id == riskResult.Id);

        Assert.NotNull(retrieved);
        Assert.Equal(75, retrieved.Score);
        Assert.Equal(TriageVerdict.Block, retrieved.Verdict);
        Assert.Equal(TriageLane.Blocked, retrieved.Lane);
        Assert.NotNull(retrieved.Finding);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Finding_Cascade_Deletes_Related_Entities()
    {
        // Arrange
        await Context.Database.EnsureCreatedAsync();

        var now = DateTimeOffset.UtcNow;
        var finding = new TriageFinding
        {
            Id = Guid.NewGuid(),
            AssetId = Guid.NewGuid(),
            AssetLabel = "prod/api:1.0",
            Purl = "pkg:npm/test@1.0.0",
            CveId = "CVE-2024-0001",
            FirstSeenAt = now,
            LastSeenAt = now,
            UpdatedAt = now
        };

        Context.Findings.Add(finding);
        await Context.SaveChangesAsync();

        var decision = new TriageDecision
        {
            Id = Guid.NewGuid(),
            FindingId = finding.Id,
            Kind = TriageDecisionKind.Ack,
            ReasonCode = "ACKNOWLEDGED",
            ActorSubject = "user:admin",
            CreatedAt = now
        };

        var riskResult = new TriageRiskResult
        {
            Id = Guid.NewGuid(),
            FindingId = finding.Id,
            PolicyId = "policy-v1",
            PolicyVersion = "1.0",
            InputsHash = "hash123",
            Score = 50,
            Why = "Medium risk",
            ComputedAt = now
        };

        Context.Decisions.Add(decision);
        Context.RiskResults.Add(riskResult);
        await Context.SaveChangesAsync();

        // Verify entities exist
        Assert.Single(await Context.Decisions.Where(d => d.FindingId == finding.Id).ToListAsync());
        Assert.Single(await Context.RiskResults.Where(r => r.FindingId == finding.Id).ToListAsync());

        // Act - delete the finding
        Context.Findings.Remove(finding);
        await Context.SaveChangesAsync();

        // Assert - related entities should be cascade deleted
        Assert.Empty(await Context.Decisions.Where(d => d.FindingId == finding.Id).ToListAsync());
        Assert.Empty(await Context.RiskResults.Where(r => r.FindingId == finding.Id).ToListAsync());
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Unique_Constraint_Prevents_Duplicate_Findings()
    {
        // Arrange
        await Context.Database.EnsureCreatedAsync();

        var assetId = Guid.NewGuid();
        var envId = Guid.NewGuid();
        const string purl = "pkg:npm/lodash@4.17.20";
        const string cveId = "CVE-2021-23337";

        var now = DateTimeOffset.UtcNow;
        var finding1 = new TriageFinding
        {
            Id = Guid.NewGuid(),
            AssetId = assetId,
            EnvironmentId = envId,
            AssetLabel = "prod/api:1.0",
            Purl = purl,
            CveId = cveId,
            FirstSeenAt = now,
            LastSeenAt = now,
            UpdatedAt = now
        };

        Context.Findings.Add(finding1);
        await Context.SaveChangesAsync();

        var finding2 = new TriageFinding
        {
            Id = Guid.NewGuid(),
            AssetId = assetId,
            EnvironmentId = envId,
            AssetLabel = "prod/api:1.0",
            Purl = purl,
            CveId = cveId,
            FirstSeenAt = now,
            LastSeenAt = now,
            UpdatedAt = now
        };

        Context.Findings.Add(finding2);

        // Act & Assert - should throw due to unique constraint
        await Assert.ThrowsAsync<DbUpdateException>(async () =>
        {
            await Context.SaveChangesAsync();
        });
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Indexes_Exist_For_Performance()
    {
        // Arrange
        await Context.Database.EnsureCreatedAsync();

        // Act - query for indexes on triage_finding table
        var indexes = await Context.Database.SqlQueryRaw<string>(
            "SELECT indexname FROM pg_indexes WHERE tablename = 'triage_finding'")
            .ToListAsync();

        // Assert - verify expected indexes exist
        Assert.Contains(indexes, i => i.Contains("last_seen"));
        Assert.Contains(indexes, i => i.Contains("purl"));
    }
}