use std::ffi::CString;
use libc::{c_char, c_int};
use std::os::unix::io::AsRawFd;

#[repr(C)]
pub struct RadioDeviceT { _private: [u8; 0] }

extern {
  fn radio_connect() -> *const RadioDeviceT;
  fn radio_disconnect();
  fn radio_download(device: *const RadioDeviceT);
  fn radio_upload(device: *const RadioDeviceT, cont_flag: c_int);
  fn radio_list_c();
  fn radio_verify_config(device: *const RadioDeviceT);
  fn radio_print_version(device: *const RadioDeviceT, stdout: *const libc::FILE);
  fn radio_print_config(device: *const RadioDeviceT, file: *const libc::FILE, verbose: c_int);
  fn radio_read_image(filename: *const c_char) -> *const RadioDeviceT;
  fn radio_save_image(device: *const RadioDeviceT, filename: *const c_char);
  fn radio_parse_config(device: *const RadioDeviceT, filename: *const c_char);
  fn radio_write_csv(device: *const RadioDeviceT, filename: *const c_char);
}

/// Connect to the radio via the serial port.
/// Identify the type of device.
pub fn connect() -> *const RadioDeviceT {
  unsafe {
    radio_connect()
  }
}

/// Close the serial port.
pub fn disconnect() {
  unsafe {
    radio_disconnect()
  }
}

/// Read firmware image from the device
pub fn download(device: *const RadioDeviceT) {
  unsafe {
    radio_download(device)
  }
}

/// Write firmware image to the device.
pub fn upload(device: *const RadioDeviceT, cont_flag: c_int) {
  unsafe {
    radio_upload(device, cont_flag)
  }
}

/// List all supported radios.
pub fn list() {

  unsafe {
    radio_list_c();
  }
}

/// Check the configuration.
pub fn verify_config(device: *const RadioDeviceT) {
  unsafe {
    radio_verify_config(device);
  }
}

/// Read firmware image from the binary file.
pub fn read_image(filename: &str) -> *const RadioDeviceT {
  let filename = CString::new(filename.to_string()).unwrap();
  unsafe {
    radio_read_image(filename.as_ptr())
  }
}

/// Save firmware image to the binary file.
pub fn save_image(device: *const RadioDeviceT, filename: &str) {
  let filename = CString::new(filename.to_string()).unwrap();
  unsafe {
    radio_save_image(device, filename.as_ptr())
  }
}

/// Read the configuration from text file, and modify the firmware.
pub fn parse_config(device: *const RadioDeviceT, filename: &str) {
  let filename = CString::new(filename.to_string()).unwrap();
  unsafe {
    radio_parse_config(device, filename.as_ptr())
  }
}

/// Print full information about the device configuration.
pub fn print_config(device: *const RadioDeviceT, filename: &str) {
  let file = std::fs::File::create(filename).unwrap();
  let fd = file.as_raw_fd();
  let mode = CString::new("w").unwrap();
  unsafe {
    let file =libc::fdopen(fd, mode.as_ptr());
    radio_print_config(device, file, 1);
    libc::fclose(file);
  }
}

pub fn print_config_to_stdout(device: *const RadioDeviceT) {
  let mode = CString::new("w").unwrap();
  unsafe {
    let stdout = libc::fdopen(libc::STDOUT_FILENO, mode.as_ptr());
    let verbosity = if libc::isatty(libc::STDOUT_FILENO) == 1 {
      0
    } else {
      1
    };
    radio_print_config(device, stdout, verbosity);
  }
}

/// Print generic information about the device.
pub fn print_version(device: *const RadioDeviceT) {
  let mode = CString::new("w").unwrap();
  unsafe {
    radio_print_version(device, libc::fdopen(libc::STDOUT_FILENO, mode.as_ptr()));
  }
}

/// Update CSV contacts database.
pub fn write_csv(device: *const RadioDeviceT, filename: &str) {
  let filename = CString::new(filename.to_string()).unwrap();
  unsafe {
    radio_write_csv(device, filename.as_ptr());
  }
}