using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using StellaOps.EvidenceLocker.Core.Builders;
using StellaOps.EvidenceLocker.Core.Domain;
using StellaOps.EvidenceLocker.Core.Repositories;
using StellaOps.EvidenceLocker.Infrastructure.Builders;
using Xunit;

namespace StellaOps.EvidenceLocker.Tests;

public sealed class EvidenceBundleBuilderTests
{
    private readonly FakeRepository _repository = new();
    private readonly IEvidenceBundleBuilder _builder;

    public EvidenceBundleBuilderTests()
    {
        _builder = new EvidenceBundleBuilder(_repository, new MerkleTreeCalculator());
    }

    [Fact]
    public async Task BuildAsync_ComputesDeterministicRootAndPersists()
    {
        var bundleId = EvidenceBundleId.FromGuid(Guid.NewGuid());
        var tenantId = TenantId.FromGuid(Guid.NewGuid());
        var request = new EvidenceBundleBuildRequest(
            bundleId,
            tenantId,
            EvidenceBundleKind.Job,
            DateTimeOffset.Parse("2025-11-03T15:04:05Z"),
            new Dictionary<string, string> { ["run-id"] = "job-42" },
            new List<EvidenceBundleMaterial>
            {
                new("inputs", "config/env.json", "5a6b7c", 1024, "application/json"),
                new("outputs", "reports/result.txt", "7f8e9d", 2048, "text/plain")
            });

        var result = await _builder.BuildAsync(request, CancellationToken.None);

        Assert.Equal(EvidenceBundleStatus.Sealed, _repository.LastStatus);
        Assert.Equal(bundleId, _repository.LastBundleId);
        Assert.Equal(tenantId, _repository.LastTenantId);
        Assert.Equal(DateTimeOffset.Parse("2025-11-03T15:04:05Z"), _repository.LastUpdatedAt);

        Assert.Equal(result.RootHash, _repository.LastRootHash);
        Assert.Equal(2, result.Manifest.Entries.Count);
        Assert.True(result.Manifest.Entries.SequenceEqual(
            result.Manifest.Entries.OrderBy(entry => entry.CanonicalPath, StringComparer.Ordinal)));
    }

    [Fact]
    public async Task BuildAsync_NormalizesSectionAndPath()
    {
        var request = new EvidenceBundleBuildRequest(
            EvidenceBundleId.FromGuid(Guid.NewGuid()),
            TenantId.FromGuid(Guid.NewGuid()),
            EvidenceBundleKind.Evaluation,
            DateTimeOffset.UtcNow,
            new Dictionary<string, string>(),
            new List<EvidenceBundleMaterial>
            {
                new(" Inputs ", "./Config/Env.JSON ", "abc123", 10, "application/json"),
                new("OUTPUTS", "\\Logs\\app.log", "def456", 20, "text/plain")
            });

        var result = await _builder.BuildAsync(request, CancellationToken.None);

        Assert.Collection(result.Manifest.Entries,
            entry => Assert.Equal("inputs/config/env.json", entry.CanonicalPath),
            entry => Assert.Equal("outputs/logs/app.log", entry.CanonicalPath));
    }

    private sealed class FakeRepository : IEvidenceBundleRepository
    {
        public EvidenceBundleId LastBundleId { get; private set; }
        public TenantId LastTenantId { get; private set; }
        public EvidenceBundleStatus LastStatus { get; private set; }
        public string? LastRootHash { get; private set; }
        public DateTimeOffset LastUpdatedAt { get; private set; }

        public Task CreateBundleAsync(EvidenceBundle bundle, CancellationToken cancellationToken)
            => Task.CompletedTask;

        public Task SetBundleAssemblyAsync(
            EvidenceBundleId bundleId,
            TenantId tenantId,
            EvidenceBundleStatus status,
            string rootHash,
            DateTimeOffset updatedAt,
            CancellationToken cancellationToken)
        {
            LastBundleId = bundleId;
            LastTenantId = tenantId;
            LastStatus = status;
            LastRootHash = rootHash;
            LastUpdatedAt = updatedAt;
            return Task.CompletedTask;
        }

        public Task MarkBundleSealedAsync(EvidenceBundleId bundleId, TenantId tenantId, EvidenceBundleStatus status, DateTimeOffset sealedAt, CancellationToken cancellationToken)
            => Task.CompletedTask;

        public Task UpsertSignatureAsync(EvidenceBundleSignature signature, CancellationToken cancellationToken)
            => Task.CompletedTask;

        public Task<EvidenceBundleDetails?> GetBundleAsync(EvidenceBundleId bundleId, TenantId tenantId, CancellationToken cancellationToken)
            => Task.FromResult<EvidenceBundleDetails?>(null);

        public Task<bool> ExistsAsync(EvidenceBundleId bundleId, TenantId tenantId, CancellationToken cancellationToken)
            => Task.FromResult(true);

        public Task<EvidenceHold> CreateHoldAsync(EvidenceHold hold, CancellationToken cancellationToken)
            => Task.FromResult(hold);

        public Task ExtendBundleRetentionAsync(EvidenceBundleId bundleId, TenantId tenantId, DateTimeOffset? holdExpiresAt, DateTimeOffset processedAt, CancellationToken cancellationToken)
            => Task.CompletedTask;

        public Task UpdateStorageKeyAsync(EvidenceBundleId bundleId, TenantId tenantId, string storageKey, CancellationToken cancellationToken)
            => Task.CompletedTask;

        public Task UpdatePortableStorageKeyAsync(EvidenceBundleId bundleId, TenantId tenantId, string storageKey, DateTimeOffset generatedAt, CancellationToken cancellationToken)
            => Task.CompletedTask;
    }
}