"""OS-specific functions for: Linux
"""
import platform
import shutil
from pathlib import Path

from milc import cli

from qmk.constants import QMK_FIRMWARE
from .check import CheckStatus


def _udev_rule(vid, pid=None, *args):
    """ Helper function that return udev rules
    """
    rule = ""
    if pid:
        rule = 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", ATTRS{idProduct}=="%s", TAG+="uaccess"' % (
            vid,
            pid,
        )
    else:
        rule = 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", TAG+="uaccess"' % vid
    if args:
        rule = ', '.join([rule, *args])
    return rule


def _deprecated_udev_rule(vid, pid=None):
    """ Helper function that return udev rules

    Note: these are no longer the recommended rules, this is just used to check for them
    """
    if pid:
        return 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", ATTRS{idProduct}=="%s", MODE:="0666"' % (vid, pid)
    else:
        return 'SUBSYSTEMS=="usb", ATTRS{idVendor}=="%s", MODE:="0666"' % vid


def check_udev_rules():
    """Make sure the udev rules look good.
    """
    rc = CheckStatus.OK
    udev_dirs = [
        Path("/usr/lib/udev/rules.d/"),
        Path("/usr/local/lib/udev/rules.d/"),
        Path("/run/udev/rules.d/"),
        Path("/etc/udev/rules.d/"),
    ]
    desired_rules = {
        'atmel-dfu': {
            _udev_rule("03eb", "2fef"),  # ATmega16U2
            _udev_rule("03eb", "2ff0"),  # ATmega32U2
            _udev_rule("03eb", "2ff3"),  # ATmega16U4
            _udev_rule("03eb", "2ff4"),  # ATmega32U4
            _udev_rule("03eb", "2ff9"),  # AT90USB64
            _udev_rule("03eb", "2ffa"),  # AT90USB162
            _udev_rule("03eb", "2ffb")  # AT90USB128
        },
        'kiibohd': {_udev_rule("1c11", "b007")},
        'stm32': {
            _udev_rule("1eaf", "0003"),  # STM32duino
            _udev_rule("0483", "df11")  # STM32 DFU
        },
        'bootloadhid': {_udev_rule("16c0", "05df")},
        'usbasploader': {_udev_rule("16c0", "05dc")},
        'massdrop': {_udev_rule("03eb", "6124", 'ENV{ID_MM_DEVICE_IGNORE}="1"')},
        'caterina': {
            # Spark Fun Electronics
            _udev_rule("1b4f", "9203", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Pro Micro 3V3/8MHz
            _udev_rule("1b4f", "9205", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Pro Micro 5V/16MHz
            _udev_rule("1b4f", "9207", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # LilyPad 3V3/8MHz (and some Pro Micro clones)
            # Pololu Electronics
            _udev_rule("1ffb", "0101", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # A-Star 32U4
            # Arduino SA
            _udev_rule("2341", "0036", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Leonardo
            _udev_rule("2341", "0037", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Micro
            # Adafruit Industries LLC
            _udev_rule("239a", "000c", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Feather 32U4
            _udev_rule("239a", "000d", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # ItsyBitsy 32U4 3V3/8MHz
            _udev_rule("239a", "000e", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # ItsyBitsy 32U4 5V/16MHz
            # dog hunter AG
            _udev_rule("2a03", "0036", 'ENV{ID_MM_DEVICE_IGNORE}="1"'),  # Leonardo
            _udev_rule("2a03", "0037", 'ENV{ID_MM_DEVICE_IGNORE}="1"')  # Micro
        },
        'hid-bootloader': {
            _udev_rule("03eb", "2067"),  # QMK HID
            _udev_rule("16c0", "0478")  # PJRC halfkay
        }
    }

    # These rules are no longer recommended, only use them to check for their presence.
    deprecated_rules = {
        'atmel-dfu': {_deprecated_udev_rule("03eb", "2ff4"), _deprecated_udev_rule("03eb", "2ffb"), _deprecated_udev_rule("03eb", "2ff0")},
        'kiibohd': {_deprecated_udev_rule("1c11")},
        'stm32': {_deprecated_udev_rule("1eaf", "0003"), _deprecated_udev_rule("0483", "df11")},
        'bootloadhid': {_deprecated_udev_rule("16c0", "05df")},
        'caterina': {'ATTRS{idVendor}=="2a03", ENV{ID_MM_DEVICE_IGNORE}="1"', 'ATTRS{idVendor}=="2341", ENV{ID_MM_DEVICE_IGNORE}="1"'},
        'tmk': {_deprecated_udev_rule("feed")}
    }

    if any(udev_dir.exists() for udev_dir in udev_dirs):
        udev_rules = [rule_file for udev_dir in udev_dirs for rule_file in udev_dir.glob('*.rules')]
        current_rules = set()

        # Collect all rules from the config files
        for rule_file in udev_rules:
            for line in rule_file.read_text(encoding='utf-8').split('\n'):
                line = line.strip()
                if not line.startswith("#") and len(line):
                    current_rules.add(line)

        # Check if the desired rules are among the currently present rules
        for bootloader, rules in desired_rules.items():
            if not rules.issubset(current_rules):
                deprecated_rule = deprecated_rules.get(bootloader)
                if deprecated_rule and deprecated_rule.issubset(current_rules):
                    cli.log.warning("{fg_yellow}Found old, deprecated udev rules for '%s' boards. The new rules on https://docs.qmk.fm/#/faq_build?id=linux-udev-rules offer better security with the same functionality.", bootloader)
                else:
                    # For caterina, check if ModemManager is running
                    if bootloader == "caterina" and check_modem_manager():
                        cli.log.warning("{fg_yellow}Detected ModemManager without the necessary udev rules. Please either disable it or set the appropriate udev rules if you are using a Pro Micro.")

                    rc = CheckStatus.WARNING
                    cli.log.warning("{fg_yellow}Missing or outdated udev rules for '%s' boards. Run 'sudo cp %s/util/udev/50-qmk.rules /etc/udev/rules.d/'.", bootloader, QMK_FIRMWARE)

    else:
        cli.log.warning("{fg_yellow}Can't find udev rules, skipping udev rule checking...")
        cli.log.debug("Checked directories: %s", ', '.join(str(udev_dir) for udev_dir in udev_dirs))

    return rc


def check_systemd():
    """Check if it's a systemd system
    """
    return bool(shutil.which("systemctl"))


def check_modem_manager():
    """Returns True if ModemManager is running.

    """
    if check_systemd():
        mm_check = cli.run(["systemctl", "--quiet", "is-active", "ModemManager.service"], timeout=10)
        if mm_check.returncode == 0:
            return True
    else:
        """(TODO): Add check for non-systemd systems
        """
    return False


def os_test_linux():
    """Run the Linux specific tests.
    """
    # Don't bother with udev on WSL, for now
    if 'microsoft' in platform.uname().release.lower():
        cli.log.info("Detected {fg_cyan}Linux (WSL){fg_reset}.")

        # https://github.com/microsoft/WSL/issues/4197
        if QMK_FIRMWARE.as_posix().startswith("/mnt"):
            cli.log.warning("I/O performance on /mnt may be extremely slow.")
            return CheckStatus.WARNING

        return CheckStatus.OK
    else:
        cli.log.info("Detected {fg_cyan}Linux{fg_reset}.")

        return check_udev_rules()
