feat: v0 tab completion

.gitignore

@@ -50,3 +50,6 @@ overleaf.kubeconfig
 # coverage report
 coverage.out
 coverage.html
+
+# claude code
+CLAUDE.md

internal/api/chat/get_citation_keys.go

@@ -0,0 +1,43 @@
+package chat
+
+import (
+	"context"
+
+	"paperdebugger/internal/libs/contextutil"
+	"paperdebugger/internal/models"
+	chatv2 "paperdebugger/pkg/gen/api/chat/v2"
+)
+
+func (s *ChatServerV2) GetCitationKeys(
+	ctx context.Context,
+	req *chatv2.GetCitationKeysRequest,
+) (*chatv2.GetCitationKeysResponse, error) {
+	actor, err := contextutil.GetActor(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	settings, err := s.userService.GetUserSettings(ctx, actor.ID)
+	if err != nil {
+		return nil, err
+	}
+
+	llmProvider := &models.LLMProviderConfig{
+		APIKey: settings.OpenAIAPIKey,
+	}
+
+	citationKeys, err := s.aiClientV2.GetCitationKeys(
+		ctx,
+		req.GetSentence(),
+		actor.ID,
+		req.GetProjectId(),
+		llmProvider,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &chatv2.GetCitationKeysResponse{
+		CitationKeys: citationKeys,
+	}, nil
+}

internal/services/toolkit/client/get_citation_keys.go

@@ -0,0 +1,53 @@
+package client
+
+// TODO: This file should not place in the client package.
+import (
+	"context"
+	"fmt"
+	"paperdebugger/internal/models"
+	"strings"
+
+	"github.com/openai/openai-go/v3"
+	"go.mongodb.org/mongo-driver/v2/bson"
+)
+
+func (a *AIClientV2) GetCitationKeys(ctx context.Context, sentence string, userId bson.ObjectID, projectId string, llmProvider *models.LLMProviderConfig) (string, error) {
+	// Get bibliography from mongodb
+	project, err := a.projectService.GetProject(ctx, userId, projectId)
+	if err != nil {
+		return "", err
+	}
+
+	var bibFiles []string
+	for _, doc := range project.Docs {
+		if doc.Filepath != "" && strings.HasSuffix(doc.Filepath, ".bib") {
+			bibFiles = append(bibFiles, doc.Lines...)
+		}
+	}
+	bibliography := strings.Join(bibFiles, "\n")
+
+	// Get citation keys from LLM
+	emptyCitation := "none"
+	message := fmt.Sprintf("Sentence: %s\nBibliography: %s\nBased on the sentence and bibliography, suggest only the most relevant citation keys separated by commas with no spaces (e.g. key1,key2). Be selective and only include citations that are directly relevant. Avoid suggesting more than 3 citations. If no relevant citations are found, return '%s'.", sentence, bibliography, emptyCitation)
+
+	_, resp, err := a.ChatCompletionV2(ctx, "gpt-5.2", OpenAIChatHistory{
+		openai.SystemMessage("You are a helpful assistant that suggests relevant citation keys."),
+		openai.UserMessage(message),
+	}, llmProvider)
+
+	if err != nil {
+		return "", err
+	}
+
+	if len(resp) == 0 {
+		return "", nil
+	}
+
+	citationKeys := strings.TrimSpace(resp[0].Payload.GetAssistant().GetContent())
+
+	if citationKeys == emptyCitation {
+		return "", nil
+	}
+
+	return citationKeys, nil
+}