package main

import (
	"fmt"
	"path"
	"strings"

	"dev.justinjudd.org/justin/bmap"
	"github.com/spf13/cobra"
)

func main() {

	var rootCmd = &cobra.Command{
		Use:   "bmap",
		Short: "Create block map (bmap) files and copy files.",
		Long:  "Create block map (bmap) files and copy files.",
		Run: func(cmd *cobra.Command, args []string) {
			cmd.Help()
		},
	}

	var output string
	var noChecksum bool

	var createCmd = &cobra.Command{
		Use:   "create image",
		Short: "Create block map (bmap) file.",
		Long:  "Create block map (bmap) file.",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) != 1 {
				fmt.Println("Must supply image file")
				return
			}
			create(args[0], output, !noChecksum)
		},
	}

	createCmd.Flags().StringVarP(&output, "output", "o", "", "output file name")
	createCmd.Flags().BoolVar(&noChecksum, "no-checksum", false, "don't generate block sum for block ranges")

	var bmapFile string
	var nobmap bool
	var noVerify bool

	var copyCmd = &cobra.Command{
		Use:   "copy image dest",
		Short: "Write an image using bmap .",
		Long:  "Write an image using bmap.",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) != 2 {
				fmt.Println("Must supply image file and destination file")
				return
			}
			copy(args[0], args[1], bmapFile, nobmap, !noVerify)
		},
	}

	copyCmd.Flags().StringVar(&bmapFile, "bmap", "", "block map file for the image")
	copyCmd.Flags().BoolVar(&nobmap, "nobmap", false, "allow copying withut a bmap")
	copyCmd.Flags().BoolVar(&noVerify, "no-verify", false, "do not verify the checksum of data before writing.")

	rootCmd.AddCommand(createCmd, copyCmd)

	var cleanCmd = &cobra.Command{
		Use:   "clean input",
		Short: "clean a bmap file.",
		Long:  "clean a bmap file.",
		Run: func(cmd *cobra.Command, args []string) {
			if len(args) != 1 {
				fmt.Println("Must supply bmap file")
				return
			}
			clean(args[0])
		},
	}
	rootCmd.AddCommand(cleanCmd)

	rootCmd.Execute()

}

func create(image string, output string, noChecksum bool) {
	b, err := bmap.NewBMap(image, noChecksum)
	if err != nil {
		println("Error reading image file:", err.Error())
	}
	err = b.Write(output)
	if err != nil {
		println("Error writing bmap file", err.Error())
	}
}

func copy(image string, dest string, bmapFile string, nobmap bool, noVerify bool) {
	if !nobmap {
		if len(bmapFile) == 0 {
			bmapFile = strings.TrimSuffix(image, path.Ext(image)) + ".bmap"
		}
		b, err := bmap.LoadFromFile(bmapFile, !noVerify)
		if err != nil {
			fmt.Println("Unable to read bmap file: ", bmapFile)
			return
		}
		err = b.Copy(image, dest, noVerify)
		if err != nil {
			fmt.Println("Error copying image: ", err.Error())
			return
		}
	} else {
		err := bmap.Copy(image, dest)
		if err != nil {
			fmt.Println("Error copying image: ", err.Error())
			return
		}
	}

}

func clean(input string) {
	err := bmap.CleanBMap(input)
	if err != nil {
		fmt.Println(err.Error())
	}
}