package cmd

import (
	"fmt"

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

func RetryCmd(ctx *lmcli.Context) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "retry <conversation>",
		Short: "Retry the last user reply in a conversation",
		Long:  `Prompt the conversation from the last user response.`,
		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)

			// Load the complete thread from the root message
			messages, err := ctx.Store.PathToLeaf(conversation.SelectedRoot)
			if err != nil {
				return fmt.Errorf("Could not retrieve messages for conversation: %s", conversation.Title)
			}

			// Find the last user message in the conversation
			var lastUserMessage *model.Message
			var i int
			for i = len(messages) - 1; i >= 0; i-- {
				if messages[i].Role == model.MessageRoleUser {
					lastUserMessage = &messages[i]
					break
				}
			}

			if lastUserMessage == nil {
				return fmt.Errorf("No user message found in the conversation: %s", conversation.Title)
			}

			// Start a new branch at the last user message
			cmdutil.HandleReply(ctx, lastUserMessage, true)
			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
		},
	}

	applyPromptFlags(ctx, cmd)
	return cmd
}