package dumpfit

import (
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"log"
	"os"

	"github.com/9elements/converged-security-suite/v2/pkg/uefi"
	"github.com/linuxboot/fiano/pkg/intel/metadata/fit"
)

func assertNoError(err error) {
	if err != nil {
		log.Fatal(err)
	}
}

func usageAndExit() {
	flag.Usage()
	os.Exit(2)
}

// Command is the implementation of `commands.Command`.
type Command struct {
}

// Usage prints the syntax of arguments for this command
func (cmd Command) Usage() string {
	return "<firmware>"
}

// Description explains what this verb commands to do
func (cmd Command) Description() string {
	return "dump FIT entries"
}

// SetupFlagSet is called to allow the command implementation
// to setup which option flags it has.
func (cmd *Command) SetupFlagSet(flag *flag.FlagSet) {}

// Execute is the main function here. It is responsible to
// start the execution of the command.
//
// `args` are the arguments left unused by verb itself and options.
func (cmd Command) Execute(ctx context.Context, args []string) {
	if len(args) < 1 {
		_, _ = fmt.Fprintf(flag.CommandLine.Output(), "error: no path to the firmare was specified\n")
		usageAndExit()
	}
	if len(args) > 1 {
		_, _ = fmt.Fprintf(flag.CommandLine.Output(), "error: too many parameters\n")
		usageAndExit()
	}
	imagePath := args[0]

	firmware, err := uefi.ParseUEFIFirmwareFile(imagePath)
	assertNoError(err)

	entries, _ := fit.GetEntries(firmware.Buf())

	jsonBytes, err := json.Marshal(entries)
	assertNoError(err)

	fmt.Println(string(jsonBytes))
}
