package cmd

import (
	"fmt"
	"image"
	"image/jpeg"
	"log"
	"os"
	"strconv"

	"github.com/nfnt/resize"
	"github.com/spf13/cobra"
)

// resizeCmd represents the resize command
var resizeCmd = &cobra.Command{
	Use:   "resize [input_file] [output_file] [width]",
	Short: "Resize an image to the specified width",
	Long: `Resize an image to the specified width using Lanczos3 interpolation.
	Example: dttt resize input.jpg output.jpg 300`,
	Args: cobra.ExactArgs(3),
	Run: func(cmd *cobra.Command, args []string) {
		if len(args) == 0 {
			cmd.Help()
			return
		}

		inputFile := args[0]
		outputFile := args[1]
		widthStr := args[2]

		width, err := strconv.Atoi(widthStr)
		if err != nil {
			log.Fatal("Invalid width:", err)
		}

		resizeImage(inputFile, outputFile, width)
	},
}

func init() {
	rootCmd.AddCommand(resizeCmd)
}

func resizeImage(inputFile, outputFile string, width int) {
	// Open the input image file
	input, err := os.Open(inputFile)
	if err != nil {
		log.Fatal("Error opening input file:", err)
	}
	defer input.Close()

	// Decode the input image file
	img, _, err := image.Decode(input)
	if err != nil {
		log.Fatal("Error decoding input image:", err)
	}

	// Resize the image to the target width
	resizedImg := resize.Resize(uint(width), 0, img, resize.Lanczos3)

	// Create the output image file
	output, err := os.Create(outputFile)
	if err != nil {
		log.Fatal("Error creating output file:", err)
	}
	defer output.Close()

	// Write the resized image to the output file
	if err := jpeg.Encode(output, resizedImg, nil); err != nil {
		log.Fatal("Error encoding resized image:", err)
	}

	fmt.Println("Image resized successfully!")
}