#!/usr/bin/env python3

import os
import struct
from zlib import crc32

from flipper.app import App


class Main(App):
    def init(self):
        self.parser.add_argument("-i", "--input", help=".bin input path", required=True)
        self.parser.add_argument(
            "-o", "--output", help=".dfu output path", required=True
        )
        self.parser.add_argument(
            "-a",
            "--address",
            help="Flash address",
            type=lambda x: int(x, 0),
            required=True,
        )
        self.parser.add_argument(
            "-l", "--label", help="DFU Target label", required=True
        )
        self.parser.add_argument(
            "--vid", help="USB Vendor ID", default=0x0483, type=lambda x: int(x, 0)
        )
        self.parser.add_argument(
            "--pid", help="USB Product ID", default=0xDF11, type=lambda x: int(x, 0)
        )

        self.parser.set_defaults(func=self.convert)

    def convert(self):
        if not os.path.exists(self.args.input):
            self.logger.error(f'"{self.args.input}" does not exist')
            return 1

        with open(self.args.input, mode="rb") as file:
            bin = file.read()

        data = struct.pack("<II", self.args.address, len(bin)) + bin

        # Target prefix
        szTargetName = self.args.label.encode("ascii")

        data = (
            struct.pack("<6sBI255sII", b"Target", 0, 1, szTargetName, len(data), 1)
            + data
        )

        # Prefix
        data = struct.pack("<5sBIB", b"DfuSe", 0x01, len(data) + 11, 1) + data

        # Suffix
        data += struct.pack(
            "<HHHH3sB", 0xFFFF, self.args.pid, self.args.vid, 0x011A, b"UFD", 16
        )

        dwCRC = ~crc32(data) & 0xFFFFFFFF

        data += struct.pack("<I", dwCRC)

        open(self.args.output, "wb").write(data)
        return 0


if __name__ == "__main__":
    Main()()