add ai feature

tests/contract/ai_ledger_entry_test.go

@@ -0,0 +1,68 @@
+package contract
+
+import (
+	"context"
+	"io"
+	"path/filepath"
+	"testing"
+
+	"github.com/rogeecn/renamer/internal/ai"
+	"github.com/rogeecn/renamer/internal/ai/flow"
+)
+
+func TestAIMetadataPersistedInLedgerEntry(t *testing.T) {
+	t.Setenv("RENAMER_AI_KEY", "test-key")
+
+	tmp := t.TempDir()
+	createFile(t, filepath.Join(tmp, "clip.mov"))
+
+	suggestions := []flow.Suggestion{
+		{Original: "clip.mov", Suggested: "highlight-01.mov"},
+	}
+
+	validation := ai.ValidateSuggestions([]string{"clip.mov"}, suggestions)
+	if len(validation.Conflicts) != 0 {
+		t.Fatalf("expected no conflicts, got %#v", validation)
+	}
+
+	entry, err := ai.Apply(context.Background(), tmp, suggestions, validation, ai.ApplyMetadata{
+		Prompt:            "Highlight Reel",
+		PromptHistory:     []string{"Highlight Reel", "Celebration Cut"},
+		Notes:             []string{"accepted preview"},
+		Model:             "googleai/gemini-1.5-flash",
+		SequenceSeparator: "_",
+	}, io.Discard)
+	if err != nil {
+		t.Fatalf("apply error: %v", err)
+	}
+
+	if entry.Command != "ai" {
+		t.Fatalf("expected command 'ai', got %q", entry.Command)
+	}
+
+	if entry.Metadata == nil {
+		t.Fatalf("expected metadata to be recorded")
+	}
+
+	if got := entry.Metadata["prompt"]; got != "Highlight Reel" {
+		t.Fatalf("unexpected prompt metadata: %#v", got)
+	}
+
+	history, ok := entry.Metadata["promptHistory"].([]string)
+	if !ok || len(history) != 2 {
+		t.Fatalf("unexpected prompt history: %#v", entry.Metadata["promptHistory"])
+	}
+
+	model, _ := entry.Metadata["model"].(string)
+	if model == "" {
+		t.Fatalf("expected model metadata to be present")
+	}
+
+	if sep, ok := entry.Metadata["sequenceSeparator"].(string); !ok || sep != "_" {
+		t.Fatalf("expected sequence separator metadata, got %#v", entry.Metadata["sequenceSeparator"])
+	}
+
+	if _, err := ai.Apply(context.Background(), tmp, suggestions, validation, ai.ApplyMetadata{Prompt: "irrelevant"}, io.Discard); err == nil {
+		t.Fatalf("expected error when renaming non-existent file")
+	}
+}