package manifest

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

const testSemanticDigest = "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"

func TestSemanticConfigFingerprintRoundTripsAndRemainsOptional(t *testing.T) {
	ctx := context.Background()
	store := &LocalStore{}
	dir := t.TempDir()
	fingerprint := &SemanticConfigFingerprint{Version: 3, Digest: testSemanticDigest}

	session := New("session", time.Now().UTC())
	session.MarkStageSucceeded("prepare", time.Now().UTC(), nil)
	session.Stages["prepare"].SemanticConfig = fingerprint
	sessionPath := filepath.Join(dir, "session.json")
	if err := store.Save(ctx, sessionPath, session); err != nil {
		t.Fatal(err)
	}
	loadedSession, err := store.Load(ctx, sessionPath)
	if err != nil {
		t.Fatal(err)
	}
	if loadedSession.Stages["prepare"].SemanticConfig == nil || !loadedSession.Stages["prepare"].SemanticConfig.Equal(*fingerprint) {
		t.Fatalf("session fingerprint = %#v", loadedSession.Stages["prepare"].SemanticConfig)
	}

	path := filepath.Join(dir, "without-fingerprint.json")
	data := `{"schema_version":"narratio.session-manifest.v1","session_id":"session","created_at":"2026-01-01T00:00:00Z","updated_at":"2026-01-01T00:00:00Z","stages":{"prepare":{"name":"prepare","status":"succeeded","created_at":"2026-01-01T00:00:00Z","updated_at":"2026-01-01T00:00:00Z"}}}`
	if err := os.WriteFile(path, []byte(data), 0o644); err != nil {
		t.Fatal(err)
	}
	loadedWithoutFingerprint, err := store.Load(ctx, path)
	if err != nil {
		t.Fatal(err)
	}
	if loadedWithoutFingerprint.Stages["prepare"].SemanticConfig != nil {
		t.Fatalf("fingerprint = %#v, want nil", loadedWithoutFingerprint.Stages["prepare"].SemanticConfig)
	}
}

func TestSemanticConfigFingerprintValidation(t *testing.T) {
	for _, test := range []struct {
		name  string
		value SemanticConfigFingerprint
		want  string
	}{
		{name: "zero version", value: SemanticConfigFingerprint{Digest: testSemanticDigest}, want: "positive"},
		{name: "uppercase digest", value: SemanticConfigFingerprint{Version: 1, Digest: strings.ToUpper(testSemanticDigest)}, want: "lowercase"},
		{name: "short digest", value: SemanticConfigFingerprint{Version: 1, Digest: "abcd"}, want: "lowercase"},
	} {
		t.Run(test.name, func(t *testing.T) {
			if err := test.value.Validate(); err == nil || !strings.Contains(err.Error(), test.want) {
				t.Fatalf("Validate() error = %v, want %q", err, test.want)
			}
		})
	}
}