package cmd

import (
	"fmt"

	"github.com/fatih/color"
	"github.com/spf13/cobra"
	"gmgauthier.com/grokkit/config"
)

var prDescribeCmd = &cobra.Command{
	Use:   "pr-describe",
	Short: "Generate full PR description from current branch",
	Run:   runPRDescribe,
}

func init() {
	prDescribeCmd.Flags().StringP("base", "b", "master", "Base branch to compare against")
}

func runPRDescribe(cmd *cobra.Command, args []string) {
	base, _ := cmd.Flags().GetString("base")

	diff, err := gitRun([]string{"diff", fmt.Sprintf("%s..HEAD", base), "--no-color"})
	if err != nil || diff == "" {
		diff, err = gitRun([]string{"diff", fmt.Sprintf("origin/%s..HEAD", base), "--no-color"})
		if err != nil {
			color.Red("Failed to get branch diff: %v", err)
			return
		}
	}
	if diff == "" {
		color.Yellow("No changes on this branch compared to %s/origin/%s.", base, base)
		return
	}
	modelFlag, _ := cmd.Flags().GetString("model")
	model := config.GetModel("prdescribe", modelFlag)

	client := newGrokClient()
	messages := buildPRDescribeMessages(diff)
	color.Yellow("Writing PR description...")
	client.Stream(messages, model)
}

func buildPRDescribeMessages(diff string) []map[string]string {
	return []map[string]string{
		{"role": "system", "content": "Write a professional GitHub PR title + detailed body (changes, motivation, testing notes)."},
		{"role": "user", "content": fmt.Sprintf("Diff:\n%s", diff)},
	}
}