# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import os
import re
import time

from ansible.module_utils.six.moves import reduce

from ansible.module_utils.facts.hardware.base import Hardware, HardwareCollector
from ansible.module_utils.facts.timeout import TimeoutError, timeout

from ansible.module_utils.facts.utils import get_file_content, get_file_lines, get_mount_size
from ansible.module_utils.facts.sysctl import get_sysctl


class NetBSDHardware(Hardware):
    """
    NetBSD-specific subclass of Hardware.  Defines memory and CPU facts:
    - memfree_mb
    - memtotal_mb
    - swapfree_mb
    - swaptotal_mb
    - processor (a list)
    - processor_cores
    - processor_count
    - devices
    - uptime_seconds
    """
    platform = 'NetBSD'
    MEMORY_FACTS = ['MemTotal', 'SwapTotal', 'MemFree', 'SwapFree']

    def populate(self, collected_facts=None):
        hardware_facts = {}
        self.sysctl = get_sysctl(self.module, ['machdep'])
        cpu_facts = self.get_cpu_facts()
        memory_facts = self.get_memory_facts()

        mount_facts = {}
        try:
            mount_facts = self.get_mount_facts()
        except TimeoutError:
            pass

        dmi_facts = self.get_dmi_facts()
        uptime_facts = self.get_uptime_facts()

        hardware_facts.update(cpu_facts)
        hardware_facts.update(memory_facts)
        hardware_facts.update(mount_facts)
        hardware_facts.update(dmi_facts)
        hardware_facts.update(uptime_facts)

        return hardware_facts

    def get_cpu_facts(self):
        cpu_facts = {}

        i = 0
        physid = 0
        sockets = {}
        if not os.access("/proc/cpuinfo", os.R_OK):
            return cpu_facts
        cpu_facts['processor'] = []
        for line in get_file_lines("/proc/cpuinfo"):
            data = line.split(":", 1)
            key = data[0].strip()
            # model name is for Intel arch, Processor (mind the uppercase P)
            # works for some ARM devices, like the Sheevaplug.
            if key == 'model name' or key == 'Processor':
                if 'processor' not in cpu_facts:
                    cpu_facts['processor'] = []
                cpu_facts['processor'].append(data[1].strip())
                i += 1
            elif key == 'physical id':
                physid = data[1].strip()
                if physid not in sockets:
                    sockets[physid] = 1
            elif key == 'cpu cores':
                sockets[physid] = int(data[1].strip())
        if len(sockets) > 0:
            cpu_facts['processor_count'] = len(sockets)
            cpu_facts['processor_cores'] = reduce(lambda x, y: x + y, sockets.values())
        else:
            cpu_facts['processor_count'] = i
            cpu_facts['processor_cores'] = 'NA'

        return cpu_facts

    def get_memory_facts(self):
        memory_facts = {}
        if not os.access("/proc/meminfo", os.R_OK):
            return memory_facts
        for line in get_file_lines("/proc/meminfo"):
            data = line.split(":", 1)
            key = data[0]
            if key in NetBSDHardware.MEMORY_FACTS:
                val = data[1].strip().split(' ')[0]
                memory_facts["%s_mb" % key.lower()] = int(val) // 1024

        return memory_facts

    @timeout()
    def get_mount_facts(self):
        mount_facts = {}

        mount_facts['mounts'] = []
        fstab = get_file_content('/etc/fstab')

        if not fstab:
            return mount_facts

        for line in fstab.splitlines():
            if line.startswith('#') or line.strip() == '':
                continue
            fields = re.sub(r'\s+', ' ', line).split()
            mount_statvfs_info = get_mount_size(fields[1])
            mount_info = {'mount': fields[1],
                          'device': fields[0],
                          'fstype': fields[2],
                          'options': fields[3]}
            mount_info.update(mount_statvfs_info)
            mount_facts['mounts'].append(mount_info)
        return mount_facts

    def get_dmi_facts(self):
        dmi_facts = {}
        # We don't use dmidecode(8) here because:
        # - it would add dependency on an external package
        # - dmidecode(8) can only be ran as root
        # So instead we rely on sysctl(8) to provide us the information on a
        # best-effort basis. As a bonus we also get facts on non-amd64/i386
        # platforms this way.
        sysctl_to_dmi = {
            'machdep.dmi.system-product': 'product_name',
            'machdep.dmi.system-version': 'product_version',
            'machdep.dmi.system-uuid': 'product_uuid',
            'machdep.dmi.system-serial': 'product_serial',
            'machdep.dmi.system-vendor': 'system_vendor',
        }

        for mib in sysctl_to_dmi:
            if mib in self.sysctl:
                dmi_facts[sysctl_to_dmi[mib]] = self.sysctl[mib]

        return dmi_facts

    def get_uptime_facts(self):
        # On NetBSD, we need to call sysctl with -n to get this value as an int.
        sysctl_cmd = self.module.get_bin_path('sysctl')
        cmd = [sysctl_cmd, '-n', 'kern.boottime']

        rc, out, err = self.module.run_command(cmd)

        if rc != 0:
            return {}

        kern_boottime = out.strip()
        if not kern_boottime.isdigit():
            return {}

        return {
            'uptime_seconds': int(time.time() - int(kern_boottime)),
        }


class NetBSDHardwareCollector(HardwareCollector):
    _fact_class = NetBSDHardware
    _platform = 'NetBSD'