#!/usr/bin/python3
"""install.py

copy files from to_system into system directories
"""

import os
import filecmp
import shutil
from glob import glob
from ipaddress import IPv4Interface
from configparser import ConfigParser
from os.path import join, getmtime, exists, basename

os.chdir('/root/aputools/to_system')

DEL = '__to_delete__'
CFGPATH = '/root/aputools/servercfg/%s.cfg'


def write_when_new(filename, content, doit):
    if not content.endswith('\n'):
        content += '\n'
    with open(filename) as fil:
        old = fil.read()
    if old == content:
        return False
    if doit:
        with open(filename, 'w') as fil:
            fil.write(content)
    return True


def create_if(name, cfg, mac):
    result = dict(
        TYPE='Ethernet',
        NAME=name,
        DEVICE=name,
        BOOTPROTO='none',
        ONBOOT='yes',
        PROXY_METHOD='none',
        BROWSER_ONLY='no',
        IPV4_FAILURE_FATAL='yes',
        IPV6INIT='no')
    if cfg == 'off':
        result['ONBOOT']='no'
    elif cfg == 'dhcp':
        result['BOOTPROTO']='dhcp'
    else:
        interface = IPv4Interface(cfg)
        if '/' not in cfg:
            if interface < IPv4Interface('128.0.0.0'):
                cfg += '/8'
            elif interface < IPv4Interface('192.0.0.0'):
                cfg += '/16'
            else:
                cfg += '/24'
                interface = IPv4Interface(cfg)
        result['IPADDR'], result['NETMASK'] = interface.with_netmask.split('/')
        _, result['PREFIX'] = interface.with_prefixlen.split('/')
    return result


def walk(action):
    for dirpath, _, files in os.walk('.'):
        syspath = dirpath[1:]  # remove leading '.'
        action.dirpath = dirpath
        action.syspath = syspath
        if files:
            match, mismatch, missing = filecmp.cmpfiles(dirpath, syspath, files)
            if mismatch:
                newer = [f for f in mismatch if getmtime(join(syspath, f)) > getmtime(join(dirpath, f))]
                if newer:
                    action.newer(newer)
                if len(newer) < len(mismatch):
                    newer = set(newer)
                    action.older([f for f in mismatch if f not in newer])
            if missing:
                if DEL in missing:
                    missing.remove(DEL)
                    with open(join(dirpath, DEL)) as fil:
                        to_delete = []
                        for f in fil:
                            f = f.strip()
                            if f and exists(join(syspath, f)):
                                if exists(join(dirpath, f)):
                                    print('ERROR: %s in %s, but also in repo -> ignored' % (f, DEL))
                                else:
                                    to_delete.append(f)
                        action.delete(to_delete)
                if missing:
                    action.missing(missing)


class Show:
    dirty = False

    def show(self, title, files):
        self.dirty = True
        print('%s %s:\n  %s' % (title, self.syspath, ' '.join(files)))

    def newer(self, files):
        self.show('get from', files)

    def older(self, files):
        self.show('replace in', files)

    def missing(self, files):
        self.show('install in', files)

    def delete(self, files):
        self.show('remove from', files)


class Do:
    def newer(self, files):
        for file in files:
            shutil.copy(join(self.syspath, file), join(self.dirpath, file))

    def older(self, files):
        for file in files:
            shutil.copy(join(self.dirpath, file), join(self.syspath, file))

    def missing(self, files):
        self.older(files)

    def delete(self, files):
        for file in files:
            os.remove(join(self.syspath, file))


IFNAMES = ['enp%ds0' % i for i in range(1,5)]


def network(doit):
    netaddr_dict = {}
    for ifname in IFNAMES:
        with open('/sys/class/net/%s/address' % ifname) as f:
            netaddr_dict[ifname] = f.read().strip().lower()
    netaddr = netaddr_dict[IFNAMES[0]]
    apuid = int(''.join(netaddr.split(':')[-3:]), 16) & 0xfffffc
    cfgfile = None
    cfgfiles = []
    for i in range(4):
        # goodie: look for mac addresses of all 4 ports
        cfgfiles += glob(CFGPATH % ('*_%6.6x' % (apuid + i)))
    if not cfgfiles:
        print('no cfg file found for %s' % netaddr)
    elif len(cfgfiles) > 1:
        print('ERROR: ambiguous cfg files: %s' % ', '.join(cfgfiles))
    else:
        cfgfile = cfgfiles[0]
    for ntry in range(1 + bool(doit)):
        with open('/etc/hostname') as f:
            hostname = f.read().strip()
        if cfgfile == CFGPATH % ('%s_%6.6x' % (hostname, apuid)):
            break
        if doit:
            if ntry == 0:
                os.system('sh sethostname.sh')
            else:
                print('ERROR: can not set host name')
                return False
        else:
            if cfgfile:
                print('host name does not match %r -> %r' % (hostname, basename(cfgfile).rpartition('_')[0]))
                show.dirty = True
            break
    if cfgfile is None:
        return False
    ifname = ''
    parser = ConfigParser()
    try:
        parser.read(cfgfile)
        network = dict(parser['NETWORK'])
        for ifname in IFNAMES:
            content = create_if(ifname, network.get(ifname, 'off'), netaddr_dict[ifname])
            content = '\n'.join('%s=%s' % kv for kv in content.items())
            todo = write_when_new('/etc/sysconfig/network-scripts/ifcfg-%s' % ifname, content, doit)
            if todo:
                print('change ', ifname)
                show.dirty = True
    except Exception as e:
        print('ERROR: can not handle %s %s: %r' % (hostname, ifname, e))
        return False
    return True


print('---')
show = Show()
result = network(False)
walk(show)

if not result:
    print('fix first above errors')
elif show.dirty:
    print('---')
    answer = input('do above? ')
    if answer.lower().startswith('y'):
        network(True)
        walk(Do())
else:
    print('nothing to do')