package cmd

import (
	"bufio"
	"fmt"
	"os"
	"strings"

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

var editCmd = &cobra.Command{
	Use:   "edit [file]",
	Short: "Edit a file in-place with Grok (safe preview)",
	Long:  `Ask Grok to edit a file. Shows a preview diff and requires explicit confirmation before writing.`,
	Run:   runEdit,
}

var editInstruction string // set by agent mode when calling from chat --agent

func init() {
	editCmd.Flags().String("instruction", "", "Edit instruction (used internally by agent mode)")
	rootCmd.AddCommand(editCmd)
}

func runEdit(cmd *cobra.Command, args []string) {
	if len(args) == 0 {
		color.Red("Usage: grokkit edit <file>")
		return
	}
	file := args[0]

	// If agent mode passed an instruction, use it directly (no prompt)
	var instruction string
	if editInstruction != "" {
		instruction = editInstruction
		color.Cyan("Agent instruction: %s", instruction)
	} else {
		// Normal interactive mode
		color.Yellow("Enter edit instruction for %s: ", file)
		scanner := bufio.NewScanner(os.Stdin)
		if scanner.Scan() {
			instruction = strings.TrimSpace(scanner.Text())
		}
		if instruction == "" {
			color.Yellow("No instruction provided.")
			return
		}
	}

	client := grok.NewClient()
	messages := buildEditMessages(file, instruction)

	color.Yellow("Asking Grok to edit %s...", file)
	edited := client.Stream(messages, config.GetModel("edit", ""))

	// Show preview
	color.Cyan("\n--- Proposed changes to %s ---\n%s\n--------------------------------", file, edited)

	var confirm string
	color.Yellow("Apply these changes to %s? (y/n): ", file)
	fmt.Scanln(&confirm)

	if confirm != "y" && confirm != "Y" {
		color.Yellow("Aborted.")
		return
	}

	if err := os.WriteFile(file, []byte(edited), 0644); err != nil {
		color.Red("Failed to write file: %v", err)
		return
	}

	color.Green("✅ Successfully edited %s", file)
}

// buildEditMessages is kept unchanged from original
func buildEditMessages(file, instruction string) []map[string]string {
	content, _ := os.ReadFile(file)
	return []map[string]string{
		{
			"role":    "system",
			"content": "You are an expert programmer. Edit the following file according to the user's instruction. Return ONLY the full new file content. Do not include any explanations.",
		},
		{
			"role":    "user",
			"content": fmt.Sprintf("File: %s\n\nCurrent content:\n%s\n\nInstruction: %s", file, string(content), instruction),
		},
	}
}