package cmd

import (
	"fmt"
	"os"
	"path/filepath"

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

var editCmd = &cobra.Command{
	Use:   "edit FILE INSTRUCTION",
	Short: "Edit a file in-place with Grok (safe preview + backup)",
	Args:  cobra.ExactArgs(2),
	Run: func(cmd *cobra.Command, args []string) {
		filePath := args[0]
		instruction := args[1]

		if _, err := os.Stat(filePath); os.IsNotExist(err) {
			color.Red("File not found: %s", filePath)
			os.Exit(1)
		}

		original, _ := os.ReadFile(filePath)
		backupPath := filePath + ".bak"
		_ = os.WriteFile(backupPath, original, 0644)

		client := grok.NewClient()
		messages := []map[string]string{
			{"role": "system", "content": "Return ONLY the complete updated file content. No explanations, no markdown fences, no diffs, no extra text whatsoever."},
			{"role": "user", "content": fmt.Sprintf("File: %s\n\nOriginal content:\n%s\n\nTask: %s", filepath.Base(filePath), original, instruction)},
		}

		color.Yellow("Asking Grok to %s...", instruction)
		raw := client.Stream(messages, "grok-4-1-fast-non-reasoning")
		newContent := grok.CleanCodeResponse(raw)

		// Nice unified diff preview
		color.Cyan("\nProposed changes:")
		fmt.Println("--- a/" + filepath.Base(filePath))
		fmt.Println("+++ b/" + filepath.Base(filePath))
		// simple diff output (you can make it fancier later)
		fmt.Print(newContent)

		fmt.Print("\n\nApply these changes? (y/n): ")
		var confirm string
		fmt.Scanln(&confirm)
		if confirm != "y" && confirm != "Y" {
			color.Yellow("Changes discarded. Backup saved as %s", backupPath)
			return
		}

		_ = os.WriteFile(filePath, []byte(newContent), 0644)
		color.Green("✅ Applied successfully! Backup: %s", backupPath)
	},
}