package cmd

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

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

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]

		modelFlag, _ := cmd.Flags().GetString("model")
		model := config.GetModel(modelFlag)

		logger.Info("edit command started",
			"file", filePath,
			"instruction", instruction,
			"model", model)

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

		original, err := os.ReadFile(filePath)
		if err != nil {
			logger.Error("failed to read file", "file", filePath, "error", err)
			color.Red("Failed to read file: %v", err)
			os.Exit(1)
		}
		logger.Debug("file read successfully", "file", filePath, "size_bytes", len(original))
		cleanedOriginal := removeLastModifiedComments(string(original))

		backupPath := filePath + ".bak"
		logger.Debug("creating backup", "backup_path", backupPath)
		if err := os.WriteFile(backupPath, original, 0644); err != nil {
			logger.Error("failed to create backup", "backup_path", backupPath, "error", err)
			color.Red("Failed to create backup: %v", err)
			os.Exit(1)
		}
		logger.Info("backup created", "backup_path", backupPath)

		client := grok.NewClient()
		messages := []map[string]string{
			{"role": "system", "content": "You are an expert programmer. Remove all unnecessary comments including last modified timestamps and ownership comments. Return only the cleaned code with no explanations, no markdown, no extra text."},
			{"role": "user", "content": fmt.Sprintf("File: %s\n\nOriginal content:\n%s\n\nTask: %s", filepath.Base(filePath), cleanedOriginal, instruction)},
		}

		color.Yellow("Asking Grok to %s...\n", instruction)
		raw := client.StreamSilent(messages, model)
		newContent := grok.CleanCodeResponse(raw)
		color.Green("✓ Response received")

		color.Cyan("\nProposed changes:")
		fmt.Println("--- a/" + filepath.Base(filePath))
		fmt.Println("+++ b/" + filepath.Base(filePath))
		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
		}

		logger.Debug("applying changes", "file", filePath, "new_size_bytes", len(newContent))
		if err := os.WriteFile(filePath, []byte(newContent), 0644); err != nil {
			logger.Error("failed to write file", "file", filePath, "error", err)
			color.Red("Failed to write file: %v", err)
			os.Exit(1)
		}
		logger.Info("changes applied successfully",
			"file", filePath,
			"backup", backupPath,
			"original_size", len(original),
			"new_size", len(newContent))
		color.Green("✅ Applied successfully! Backup: %s", backupPath)
	},
}

func removeLastModifiedComments(content string) string {
	lines := strings.Split(content, "\n")
	var cleanedLines []string

	for _, line := range lines {
		if strings.Contains(line, "Last modified") {
			continue
		}
		cleanedLines = append(cleanedLines, line)
	}

	return strings.Join(cleanedLines, "\n")
}