package cmd

import (
	"fmt"
	"strings"

	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
	"github.com/spf13/cobra"
	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
)

func RenameCmd(ctx *lmcli.Context) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "rename <conversation> [title]",
		Short: "Rename a conversation",
		Long:  `Renames a conversation, either with the provided title or by generating a new name.`,
		Args: func(cmd *cobra.Command, args []string) error {
			argCount := 1
			if err := cobra.MinimumNArgs(argCount)(cmd, args); err != nil {
				return err
			}
			return nil
		},
		RunE: func(cmd *cobra.Command, args []string) error {
			shortName := args[0]
			conversation := cmdutil.LookupConversation(ctx, shortName)

			var err error
			var title string

			generate, _ := cmd.Flags().GetBool("generate")
			if generate {
				messages, err := ctx.Store.PathToLeaf(conversation.SelectedRoot)
				if err != nil {
					return fmt.Errorf("Could not retrieve conversation messages: %v", err)
				}
				title, err = cmdutil.GenerateTitle(ctx, messages)
				if err != nil {
					return fmt.Errorf("Could not generate conversation title: %v", err)
				}
			} else {
				if len(args) < 2 {
					return fmt.Errorf("Conversation title not provided.")
				}
				title = strings.Join(args[1:], " ")
			}

			conversation.Title = title
			err = ctx.Store.UpdateConversation(conversation)
			if err != nil {
				lmcli.Warn("Could not update conversation title: %v\n", err)
			}
			return nil
		},
		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
			compMode := cobra.ShellCompDirectiveNoFileComp
			if len(args) != 0 {
				return nil, compMode
			}
			return ctx.Store.ConversationShortNameCompletions(toComplete), compMode
		},
	}

	cmd.Flags().Bool("generate", false, "Generate a conversation title")

	return cmd
}