// -----------------------------------------------------------------------------
// ArtifactMigrationState.cs
// Sprint: SPRINT_20260118_017_Evidence_artifact_store_unification
// Task: AS-006 - Migrate existing evidence to unified store
// Description: Tracks migration progress state
// -----------------------------------------------------------------------------
namespace StellaOps.Artifact.Infrastructure;

internal sealed class ArtifactMigrationState
{
    private readonly TimeProvider _timeProvider;

    public ArtifactMigrationState(int totalItems, TimeProvider timeProvider)
    {
        ArgumentNullException.ThrowIfNull(timeProvider);
        _timeProvider = timeProvider;
        TotalItems = totalItems;
        StartedAt = _timeProvider.GetUtcNow();
        LastUpdateAt = StartedAt;
    }

    public int TotalItems { get; }
    public int ProcessedItems { get; private set; }
    public int SuccessCount { get; private set; }
    public int FailureCount { get; private set; }
    public int SkippedCount { get; private set; }
    public DateTimeOffset StartedAt { get; }
    public DateTimeOffset LastUpdateAt { get; private set; }

    public MigrationProgress Apply(ArtifactMigrationResult result)
    {
        ProcessedItems++;
        if (result.Success && !result.Skipped)
        {
            SuccessCount++;
        }
        else if (result.Skipped)
        {
            SkippedCount++;
        }
        else
        {
            FailureCount++;
        }

        LastUpdateAt = _timeProvider.GetUtcNow();

        return new MigrationProgress
        {
            TotalItems = TotalItems,
            ProcessedItems = ProcessedItems,
            SuccessCount = SuccessCount,
            FailureCount = FailureCount,
            SkippedCount = SkippedCount,
            StartedAt = StartedAt,
            LastUpdateAt = LastUpdateAt,
            CurrentItem = result.OriginalPath
        };
    }
}