package main

import (
	"fmt"
	"os"
	//"encoding/binary"
	//"bufio"
	//"bytes"
	//"io"
	"path/filepath"

	"github.com/alexflint/go-arg"

	"git.zorchenhimer.com/go-fds"
)

type Arguments struct {
	Input string `arg:"positional,required"`
}


func main() {
	args := &Arguments{}
	arg.MustParse(args)

	err := run(args)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

func run(args *Arguments) error {
	file, err := os.Open(args.Input)
	if err != nil {
		return err
	}
	defer file.Close()

	//reader := bufio.NewReader(file)
	//magic, err := reader.Peek(4)
	//if err != nil {
	//	return fmt.Errorf("Unable to peek header: %w", err)
	//}

	//header := &fds.FdsHeader{}

	//// "FDS" + EOF.  header may be omitted.
	//if bytes.Equal(magic, []byte{0x46, 0x44, 0x53, 0x1A}) {
	//	err = binary.Read(reader, binary.LittleEndian, header)
	//	if err != nil {
	//		return fmt.Errorf("Error reading header: %w", err)
	//	}
	//}

	//if header != nil {
	//	fmt.Println("Header found.  sides:", header.Sides)
	//} else {
	//	fmt.Println("No header")
	//}

	//blocks, err := fds.ReadBlocks(reader, true)
	//if err != nil {
	//	return err
	//}

	rom, err := fds.ReadRom(file, filepath.Ext(args.Input) == ".fds")
	if err != nil {
		return err
	}

	for _, block := range rom.Blocks {
		fmt.Println(block)
	}

	return nil
}