"""WizardKit: Volume functions"""
# vim: sts=2 sw=2 ts=2

import logging
import re

from wk import os as wk_os
from wk.cfg.hw import (
  VOLUME_FAILURE_THRESHOLD,
  VOLUME_WARNING_THRESHOLD,
  VOLUME_SIZE_THRESHOLD,
  )
from wk.std import PLATFORM, bytes_to_string
from wk.ui.ansi import color_string


# STATIC VARIABLES
LOG = logging.getLogger(__name__)


# Functions
def add_dev_line(test_obj, details) -> None:
  """Add device line to test report."""
  if details is test_obj.dev:
    details = details.raw_details
  filesystem = details['fstype']
  report_line = re.sub(r"^/dev/", "  ", details['name'])
  label = details['label']
  if label:
    label = f', "{color_string(label, "CYAN")}"'
  report_line += f' ({filesystem}{label if label else ""})'

  # Bail early
  if not filesystem:
    # Skip devices without a filesystem
    return

  # Get sizes
  used = -1
  percent_used = -1
  size = details['size']
  if PLATFORM == 'Darwin':
    size = int(details.get('TotalSize', -1))
    free = int(details.get('FreeSpace', 0))
    used = size - free
  elif PLATFORM == 'Linux':
    free = details.get('fsavail', 0)
    used = details.get('fsused', -1)
    if free is None:
      free = 0
    if used is None:
      used = -1
  percent_used = (used / size) * 100

  # Report Bitlocker
  if filesystem == 'BitLocker':
    test_obj.report.append(f'{report_line} {bytes_to_string(size)}')

  # Handle unsupported devices
  if not details['mountpoint']:
    # Under Linux the volume needs to be mounted to get used space
    used = -1

  # Check for failures
  if (used > 0
      and percent_used >= VOLUME_FAILURE_THRESHOLD
      and size >= VOLUME_SIZE_THRESHOLD * 1024**3):
    test_obj.failed = True

  # Build and color size_line if needed
  color = None
  if test_obj.failed:
    color = 'RED'
  elif percent_used >= VOLUME_WARNING_THRESHOLD:
    color = 'YELLOW'
  size_line = f'{bytes_to_string(size)}'
  if used > 0:
    size_line += f' ({bytes_to_string(used)} used, {percent_used:0.0f}% full)'
  size_line = color_string(size_line, str(color))

  # Done
  test_obj.report.append(f'{report_line} {size_line}')


def check_volume_utilization(test_obj) -> None:
  """Check volume utilization using OS specific methods."""
  dev = test_obj.dev

  # Mount all volumes (read only if possible)
  mount_all_volumes(test_obj.dev)
  dev.update_details(skip_children=False)

  # Build report
  test_obj.report.append(color_string('Disk Utilization', 'BLUE'))
  for _d in (dev, *dev.children):
    add_dev_line(test_obj, _d)

  # Update test object
  if test_obj.failed:
    test_obj.dev.add_note('Full volume(s) detected', color='YELLOW')
    test_obj.passed = False
    test_obj.set_status('Failed')
  else:
    test_obj.passed = True
    test_obj.set_status('Passed')


def mount_all_volumes(dev) -> None:
  """Mount all volumes for dev using."""
  if PLATFORM == 'Darwin':
    # NOTE: Disabled due to a bug they should already be mounted by macOS
    #wk_os.mac.mount_disk(device_path=dev.path)
    pass
  elif PLATFORM == 'Linux':
    wk_os.linux.mount_volumes(
      device_path=dev.path,
      read_write=False,
      scan_corestorage=not any(t.failed for t in dev.tests),
      )


if __name__ == '__main__':
  print("This file is not meant to be called directly.")