package cp

import (
	"bufio"
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"os"
)

type CPReader struct {
	FileHandle   *os.File
	streamReader *bufio.Reader
	cursorOffset uint32
	//h    header
}

const (
	CPE_FILE_IDENTIFIER      string = "CPDFile"
	CPE_FILE_IDENTIFIER_SIZE int    = 7
	CPE_FILE_VER             int    = 2
	CPE_FILE_VER_SIZE        int    = 1
	CPE_ENCRYPTED_FILE_VER   int    = 3
	CPE_FILE_SUBVER          int    = 0
	CPE_FILE_SUBVER_SIZE     int    = 1
	CPE_FILE_HEADER_LENGTH   int    = 9
	CPE_SECTION_NAME_SIZE    int    = 3
	CPE_SECTION_LEN_SIZE     int    = 4
	CPE_SECTION_COUNT        int    = 3
	CPE_SECTION_EXT          string = "EXT"
	CPE_SECTION_CP           string = "CPS"
	CPE_SECTION_LLP          string = "LLP"
	CPE_SECTION_RADIOPASS    string = "RPP"
	CPE_SECTION_TONEFILE     string = "TON"
)

func NewReader(fileName string) (_ CPReader, err error) {
	return CPReader{}.NewReader(fileName)
}
func (r CPReader) NewReader(fileName string) (_ CPReader, err error) {
	r.FileHandle, err = os.Open(fileName)
	if err != nil {
		return r, err
	}
	r.streamReader = bufio.NewReader(r.FileHandle)
	return r, nil
}
func (r *CPReader) Close() {
	r.FileHandle.Close()
}
func (r *CPReader) read32Bit() (value int, err error) {
	bytes := make([]byte, 4)
	_, err = io.ReadFull(r.streamReader, bytes)
	if err != nil {
		return 0, err
	}
	r.cursorOffset += 4
	return int(binary.LittleEndian.Uint32(bytes)), nil
}
func (r *CPReader) Test() (err error) {
	firstInt, _ := r.read32Bit()
	fmt.Printf("first int is %d\n", firstInt)
	if firstInt == 0 {
		return errors.New("table empty")
	}
	tableIndex := 0
	if tableIndex < firstInt {
		recordType, _ := r.read32Bit()
		fmt.Printf("recordType is %d\n", recordType)

	}
	return nil
}