Implemented add comments

internal/commands/issues/comment.go

@@ -0,0 +1,76 @@
+package issuesCmd
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+// commentFlags holds the flag values for the comment command.
+var commentFlags struct {
+	message string
+	author  string
+}
+
+const commentCmdExample = `pm comment ISSUE-1 "Fix the login bug"
+pm comment ISSUE-1 "LGTM" --author "alice"
+pm comment ISSUE-1 -m "Needs review"`
+
+// CommentCmd represents the comment command,
+// which allows users to add a comment on an existing issue by its ID.
+var CommentCmd = &cobra.Command{
+	Use:     "comment [issue ID] [message]",
+	Short:   "Add a comment on an issue",
+	Long:    `Add a comment on an issue by ID. Message can be passed as an argument or via --message.`,
+	Example: commentCmdExample,
+
+	Args:              cobra.RangeArgs(1, 2),
+	RunE:              runCommentCmd,
+	ValidArgsFunction: completeIssues,
+}
+
+// runCommentCmd executes the comment command logic,
+// which adds a comment on an issue by its ID.
+func runCommentCmd(cmd *cobra.Command, args []string) error {
+	issueID := args[0]
+	var text string
+	if len(args) >= 2 {
+		text = args[1]
+	} else {
+		text = commentFlags.message
+	}
+	if strings.TrimSpace(text) == "" {
+		return fmt.Errorf("comment text cannot be empty (use --message or pass as argument)")
+	}
+
+	app := AppFromContext(cmd.Context())
+
+	// Ensure issue exists.
+	issue, err := app.Issues.GetIssue(cmd.Context(), issueID)
+	if err != nil {
+		return fmt.Errorf("error fetching issue: %w", err)
+	}
+	if issue == nil {
+		return fmt.Errorf("issue with ID %s not found", issueID)
+	}
+
+	author := commentFlags.author
+	if author == "" {
+		author = "cli"
+	}
+
+	comment, err := app.Issues.AddIssueComment(cmd.Context(), issue.ID, author, text)
+	if err != nil {
+		return fmt.Errorf("error adding comment: %w", err)
+	}
+
+	cmd.Printf("Comment added on %s:\n", issueID)
+	cmd.Printf("  %s @ %s: %s\n", comment.Author, comment.CreatedAt.Format("2006-01-02 15:04"), comment.Text)
+	return nil
+}
+
+func init() {
+	CommentCmd.Flags().StringVarP(&commentFlags.message, "message", "m", "", "Comment text (alternative to positional argument)")
+	CommentCmd.Flags().StringVarP(&commentFlags.author, "author", "a", "cli", "Author name for the comment")
+}