package artifacts

import (
	"context"
	"encoding/json"
	"errors"
	"testing"
	"time"

	"gitea.maximumdirect.net/eric/narratio/internal/adapters/storage"
)

func TestLoadCurrentStateRequiresCommitPointer(t *testing.T) {
	store := &storage.FakeBackend{}
	prefix := S3SessionPrefix("dnd", "sample-campaign", "2026-05-03")
	_, err := LoadCurrentState(context.Background(), store, prefix, CurrentStateValidation{})
	var missing *CurrentCommitPointerMissingError
	if !errors.As(err, &missing) || !errors.Is(err, ErrCurrentCommitPointerMissing) {
		t.Fatalf("LoadCurrentState() error = %v, want missing commit pointer", err)
	}
	if missing.Key != S3CurrentCommitPointerKey(prefix) {
		t.Fatalf("missing pointer key = %q", missing.Key)
	}
}

func testCurrentSessionPrefix() string {
	return S3SessionPrefix("dnd", "sample-campaign", "2026-05-03")
}

func testManifestJSON(t *testing.T, sessionID, campaign, runID string) []byte {
	t.Helper()
	now := time.Date(2026, 5, 19, 23, 0, 0, 0, time.UTC).Format(time.RFC3339Nano)
	data, err := json.Marshal(map[string]any{
		"schema_version": "narratio.session-manifest.v1", "session_id": sessionID,
		"campaign": campaign, "run_id": runID, "created_at": now, "updated_at": now,
		"stages": map[string]any{},
	})
	if err != nil {
		t.Fatalf("marshal manifest payload: %v", err)
	}
	return append(data, '\n')
}