#!/usr/bin/env python
#
# archey3 [version 0.4]
#
# Copyright 2010 Melik Manukyan <melik@archlinux.us>
# Copyright 2010-2011 Laurie Clark-Michalek <bluepeppers@archlinux.us>
# Distributed under the terms of the GNU General Public License v3.
# See http://www.gnu.org/licenses/gpl.txt for the full license text.
#
# Simple python script to display an Archlinux logo in ASCII art 
# Along with basic system information.

# Import libraries
import collections
import subprocess, optparse, re, sys, configparser
from subprocess import Popen, PIPE
from optparse import OptionParser
from getpass import getuser
from time import ctime, sleep
from os import getenv
import re
import os.path
import multiprocessing

try:
    from logbook import Logger, lookup_level
except ImportError:
    class Logger(object):
        def __init__(self, name, level=0):
            self.name = name
            self.level = level
        debug = info = warn = warning = notice = error = exception = \
            critical = log = lambda *a, **kw: None
    
    def lookup_level(_):
        return 0

UNAME_FLAG_MEANINGS = {
    'a': 'System Infomation',
    's': 'Kernel Name',
    'n': 'Hostname',
    'r': 'Kernel Release',
    'v': 'Kernel Version',
    'm': 'Machine Hardware name',
    'p': 'Processor Type',
    'i': 'Hardware Platform',
}

LOGOS = {'Arch Linux': '''{c1}
{c1}               +                {results[0]}
{c1}               #                {results[1]}
{c1}              ###               {results[2]}
{c1}             #####              {results[3]}
{c1}             ######             {results[4]}
{c1}            ; #####;            {results[5]}
{c1}           +##.#####            {results[6]}
{c1}          +##########           {results[7]}
{c1}         ######{c2}#####{c1}##;         {results[8]}
{c1}        ###{c2}############{c1}+        {results[9]}
{c1}       #{c2}######   #######        {results[10]}
{c2}     .######;     ;###;`\".      {results[11]}
{c2}    .#######;     ;#####.       {results[12]}
{c2}    #########.   .########`     {results[13]}
{c2}   ######'           '######    {results[14]}
{c2}  ;####                 ####;   {results[15]}
{c2}  ##'                     '##   {results[16]} 
{c2} #'                         `#  {results[17]}
\x1b[0m'''
}

CLASS_MAPPINGS = {}

def module_register(name):
    """
    Registers the class in the CLASS_MAPPING global.
    """
    def decorator(cls):
        CLASS_MAPPINGS[name] = cls
        return cls
    return decorator

DE_DICT = {'gnome-session': 'GNOME',
    'ksmserver': 'KDE',
    'xfce4-session': 'Xfce 4.10',
    'lxsession': 'LXDE',
    '': 'None',
}
        
WM_DICT = {
    'awesome': 'Awesome',
    'beryl': 'Beryl',
    'blackbox': 'Blackbox',
    'dwm': 'DWM',
    'enlightenment': 'Enlightenment',
    'fluxbox': 'Fluxbox',
    'fvwm': 'FVWM',
    'i3': 'i3',
    'icewm': 'IceWM',
    'kwin': 'KWin',
    'metacity': 'Metacity',
    'musca': 'Musca',
    'openbox': 'Openbox',
    'pekwm': 'PekWM',
    'ratpoison': 'ratpoison',
    'scrotwm': 'ScrotWM',
    'subtle': 'subtle',
    'wmaker': 'Window Maker',
    'wmfs': 'Wmfs',
    'wmii': 'wmii',
    'xfwm4': 'Xfwm',
    'emerald': 'Emerald',
    'compiz': 'Compiz',
    re.compile('xmonad-*'): 'xmonad',
    '': 'None',
}

COLORS = {
    'black': '0',
    'red': '1',
    'green': '2',
    'yellow': '3',
    'blue': '4',
    'magenta': '5',
    'cyan': '6',
    'white': '7'
}

class ArgumentError(Exception):
    def __init__(self, caller, message):
        msg = "{0}: {1}".format(caller.__class__.__name__, message)
        super().__init__(msg)

# State must be serializable
State = collections.namedtuple("State", "color config logger")

class display(object):
    command_line = ''
    stdindata = ''
    
    def __init__(self, state, args=()):
        self.state = state
        # Python3 unpacking is awesome
        self.arg1, self.arg2, self.arg3, *_ = tuple(args) + ('', '', '')
    
    @staticmethod
    def call_command(command):
        """
        Calls a command, waits for it to exit and returns all text from stdout.
        Discards all other information.
        """
        proc = Popen(command.split(), stdout=PIPE)
        proc.wait()
        return proc.communicate()[0].decode()
    
    def run_command(self):
        if self.command_line:
            if '{arg3}' in self.command_line:
                cmd = self.command_line.format(arg1=self.arg1, arg2=self.arg2,
                                               arg3=self.arg3)
            elif '{arg2}' in self.command_line:
                cmd = self.command_line.format(arg1=self.arg1, arg2=self.arg2)
            elif '{arg1}' in self.command_line:
                cmd = self.command_line.format(arg1=self.arg1)
            else:
                cmd = self.command_line
            
            try:
                self.process = Popen(cmd.split(), stdin=PIPE, stdout=PIPE,
                                      stderr=PIPE)
            except Exception as e:
                self.state.logger.error("Could not run command {0}".format(cmd))
    
    def render(self):
        (stdoutdata, stderrdata) = self.process.communicate(self.stdindata
                                                             or None)
        
        return self.format_output(stdoutdata.decode())
        
    def color_me(self, output, number=None, low=30, low_color='green',
                 medium=60, medium_color='yellow', high_color='red'):
        if number is None and output.isdigit():
            number = int(output)
        elif number is None:
            return output
        
        if number <= low:
            color_= low_color
        elif low < number <= medium:
            color_ = medium_color
        elif medium < number:
            color_ = high_color
        
        return '{0}{1}{2}'.format(color(self.state, color_), output,
                                  color(self.state, 'clear'))
    
    regex_class = re.compile("").__class__
    def process_exists(self, key):
        global PROCESSES
        if isinstance(key, self.regex_class):
            for proc in PROCESSES._processes:
                if key.search(proc):
                    return True
        return PROCESSES(key)


@module_register("fs")
class fsDisplay(display):
    command_line = "df -TPh {arg1}"
    
    conversions = {
        'binary': {
               'K': 2 ** 10,
               'M': 2 ** 20,
               'G': 2 ** 30,
               'T': 2 ** 40,
               },
        'si': {
            'K': 10 ** 3,
            'M': 10 ** 6,
            'G': 10 ** 9,
            'T': 10 ** 12,
            },
    }
    
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        if not self.arg1:
            msg = "Did not any arguments, require one, the fs to display"
            self.state.logger.error(msg)
            raise ArgumentError(self, msg)
    
    def format_output(self, instring):
        try:
            decimal_point = self.call_command(
                'locale -ck decimal_point').split('\n')[1].split('=')[1]
        except Exception as e:
            self.state.logger.warning('Could not determine locale decimal point,' +
                   'defaulting to \'.\', failed with error {0}'.format(e))
            decimal_point = '.'
        values = [line for line in instring.split('\n') if line][1].split()
        used = values[3].replace(decimal_point, '.')
        total = values[2].replace(decimal_point, '.')
        fstype = values[1]
        conversion_type = self.state.config.get('fs', 'unit', fallback="si").lower()
        conversions = self.conversions[conversion_type]
        
        mount = '/root' if self.arg1 == '/' else self.arg1 
        title = mount.split('/')[-1].title()
        
        low = self.state.config.getint('fs', 'low_bound', fallback=40)
        medium = self.state.config.getint('fs', 'medium_bound', fallback=70)
        
        try:
            #convert to straight float
            used_ = float(used[:-1]) * conversions[used[-1].upper()]
            total_ = float(total[:-1]) * conversions[total[-1].upper()]
            persentage = used_ / total_ * 100
        except Exception as e:
            self.state.logger.error(
                "Could not colorize output, errored with {0}".format(e))
            return
        else:
            used = self.color_me(used, persentage, low=low, medium=medium)
        
        if self.state.config.getboolean("fs", "persentage", fallback=True):
            part = '{used} / {total} ({persentage}%) ({fstype})'.format(
                used=used, total=total, persentage=int(persentage),
                fstype=fstype)
        else:
            part = '{used} / {total} ({fstype})'.format(
                used=used, total=total, fstype=fstype)
        return title, part

@module_register("ram")
class ramDisplay(display):
    command_line = "free -m"
    
    def format_output(self, instring):
        ram = ''.join(line for line in str(instring).split('\n') if\
                      line.startswith('Mem:')).split()
        used = int(ram[2]) - int(ram[5]) - int(ram[6])
        total = int(ram[1])
        title = 'RAM'
        try:
            persentage = (used / total * 100)
        except:
            used += ' MB'
        else:
            used = self.color_me(number=persentage, output=str(used) + ' MB')
        part = '{used} / {total} MB'.format(used=used, total=total)
        return title, part
        
@module_register("sensor")
class sensorDisplay(display):
    command_line = "sensors {arg1}"
    
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        arg_from_conf = self.state.config.get('sensor', 'sensor',
                                        fallback='coretemp-*')
        try:
            arg_from_arg = kwargs["args"][0]
        except IndexError:
            self.state.logger.error(
               "Did not get any arguments, require one, the sensor to display.")
            raise
        
        if arg_from_arg:
            self.arg1 = arg_from_arg
        else:
            self.arg1 = arg_from_conf
    
    def format_output(self, instring):
        tempinfo = instring.split('\n')[2::4]
        
        out = []
        for line in tempinfo:
            info = [re.sub("\s\s+", "", line) for line in line.split('  ') if\
                    line]
            value = info[1]
            intvalue = int(value[:3])
            if intvalue > 45:
                temp = (color(self.state, "red") + info[1] +
                        color(self.state, "clear"))
            elif intvalue in range(30, 45):
                temp = (color(self.state, "magenta") + info[1] +
                        color(self.state, "clear"))
            else:
                temp = (color(self.state, "green") + info[1] +
                        color(self.state, "clear"))
            out.append((info[0], temp))
        return out

@module_register("env")
class envDisplay(display):
    def __init__(self, **kwargs):
        try:
            self.arg1 = kwargs["args"][0]
        except IndexError:
            self.state.logger.error("Did not get any arguments, require one," +
                              " the env variable to display.")
            raise
        
        super().__init__(**kwargs)
    
    def render(self):
        argvalue = getenv(self.arg1.upper())
        return ('$' + self.arg1.upper(), argvalue)

@module_register("uname")
class unameDisplay(display):
    command_line = "uname {arg1}"
    
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        
        try:
            flag = kwargs["args"][0]
        except IndexError:
            self.state.logger.error("Did not get any arguments, require one," +
                              " the flag to pass to uname")
            raise
        
        arg_from_conf = self.state.config.get('uname', 'argument', fallback="")
        arg_from_arg = flag
        if arg_from_arg:
            self.arg1 = '-' + arg_from_arg
        elif arg_from_conf:
            self.arg1 = '-' + arg_from_conf
        else:
            self.arg1 = ''
    
    def format_output(self, instring):
        return (UNAME_FLAG_MEANINGS[self.arg1[1]], instring)

@module_register("uptime")
class uptimeDisplay(display):
    def render(self):
        with open("/proc/uptime") as upfile:
            raw = upfile.read()
            fuptime = int(raw.split('.')[0])
            
            day = int(fuptime / 86400)
            fuptime = fuptime % 86400
            hour = int(fuptime / 3600)
            fuptime = fuptime % 3600
            minute = int(fuptime / 60)
            uptime = '{daystring}{hours}:{mins:02d}'.format(
                daystring='{days} day{s}, '.format(days=day, s=('s' if day > 1
                                                     else '')) if day else '',
                hours = hour, mins = minute
            )
            return "Uptime", uptime

@module_register("packages")
class packageDisplay(display):
    command_line = "pacman -Q"
    
    def format_output(self, instring):
        return "Packages", len(instring.split('\n'))

@module_register("distro")
class distroCheck(display):
    def render(self):
        try:
            _ = open("/etc/pacman.conf")
        except IOError:
            distro = self.call_command("uname -o")
        else:
            distro = "Arch Linux"
        distro = '{0} {1}'.format(distro, self.call_command("uname -m"))
        return "OS", distro

@module_register("process")
class processCheck(display):
    command_line = "ps -u " + getuser()
    
    render = lambda self: self
    
    def run_command(self):
        super().run_command()
        out = str(self.process.communicate()[0])
        
        self._processes = set()
        for line in out.split("\\n"):
            words = line.split()
            if len(words) <= 3:
                continue
            
            self._processes.add(words[3])
    
    def __call__(self, proc):
        if proc in self._processes:
            return True
        return False
        
@module_register("wm")
class wmDisplay(display):
    def render(self):
        if self.state.config.get('wm', 'manual', fallback=False):
            return "WM", self.state.config.get('wm', 'manual')
        wm = ''
        for key in WM_DICT.keys():
            if self.process_exists(key):
                wm = key
                break
        return "WM", WM_DICT[wm]

@module_register("de")
class deDisplay(display):
    def render(self):
        if self.state.config.get('de', 'manual', fallback=False):
            return "DE", self.state.config.get('de', 'manual')
        de = ''
        for key in DE_DICT.keys():
            if self.process_exists(key):
                de = key
                break
        return "DE", DE_DICT[de]

@module_register("mpd")
class mpdDisplay(display):
    """
    Displays certain stat about MPD database. If mpd not installed, output
    nothing.
    """
    command_line = "mpc stats --host {arg1} --port {arg2}"
    
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        
        try:
            self.stat = kwargs["args"][0]
        except IndexError:
            self.state.logger.error("Did not get any arguments, require one," +
                              " the stat to display.")
        self.arg1 = self.state.config.get('mpd', 'host', fallback='localhost')
        self.arg2 = self.state.config.getint('mpd', 'port', fallback=6600)
    
    def format_output(self, instring):
        lines = instring.split('\n')
        stats = {}
        try:
            stats['artists'] = lines[0].split(':')[1].strip()
            stats['albums'] = lines[1].split(':')[1].strip()
            stats['songs'] = lines[2].split(':')[1].strip()
        #if people don't have mpc installed then return None)
        except:
            self.state.logger.error(
                "Could not parse mpc output, is mpc installed?")
            return
        
        return ('{statname} in MPD database'.format(statname=self.stat.title()),
               stats[self.stat])

#------------ Config    -----------

class ArcheyConfigParser(configparser.SafeConfigParser):
    """
    A parser for the archey config file.
    """

    defaults = {'core': {'align': 'top',
                         'color': 'blue',
                         'display_modules':
                         """\
distro(), uname(n), uname(r), uptime(), wm(), de(), packages(), ram(),\
 uname(p), env(editor), fs(/), mpd(albums)"""
                         },
                }
    
    def read(self, file_location=None):
        """
        Loads the config options stored in at file_location. If file_location
        does not exist, it will attempt to load from the default config location
        ($XDG_CONFIG_HOME/archey3.cfg). If that does not exist, it will write a
        default config file to $XDG_CONFIG_HOME/archey3.cfg.
        """
        
        config_location = os.path.expandvars(os.path.expanduser(
                file_location or "$XDG_CONFIG_HOME/archey3.cfg"))
        
        loaded = super(ArcheyConfigParser, self).read(config_location)
        
        if file_location == None and not loaded:
            self.load_default_config()
            self.write_config(config_location)
            return [config_location]
        if not loaded:
            #Try with default
            loaded = super(ArcheyConfigParser, self).read()
        return loaded

    def load_default_config(self):
        """
        Loads the config options stored at self.defaults.
        """
        for section, values in self.defaults.items():
            if not self.has_section(section):
                self.add_section(section)
            
            for option, value in values.items():
                #strip any excess spaces
                value = re.sub("( +)", " ", value)
                self.set(section, option, value)

    def write_config(self, location):
        """
        Writes the current config to the given location.
        """
        with open(location, 'w') as configfile:
            self.write(configfile)
    

#------------ Functions -----------

def screenshot(state):
    print('Screenshotting in')
    screenshot_time = state.config.getint("core", "screenshotwait", fallback=5)
    for x in sorted(range(1, screenshot_time + 1), reverse=True):
        print('%s' % x, end='')
        sys.stdout.flush()
        sleep(1.0/3)
        for x in range(3):
            print('.', end='')
            sys.stdout.flush()
            sleep(1.0/3)
            
    print('Say Cheese!')
    sys.stdout.flush()
    
    screenshot_command = state.config.get('core', 'screenshot_command', 
                                  fallback="import -window root <datetime>.jpg")
    try:
        subprocess.check_call(
            screenshot_command.replace('<datetime>',
                                       ctime().replace(' ','_')).split(" "))
    except subprocess.CalledProcessError as e:
        state.logger.critical('Screenshot failed with return code {0}.'.format(
                e.returncode))
        raise

def color(state, code, bold=False):
    """
    Returns a character color sequence acording to the code given, and the
    color theme in the state argument.
    """
    if code == 2:
        bold = True
    first_bitty_bit = '\x1b[{0};'.format(int(not bold))
    if code in range(3):
        second_bitty_bit = '3{0}m'.format(state.color)
    elif code == "clear":
        return '\x1b[0m'
    else:
        second_bitty_bit = '3{0}m'.format(COLORS[code])

    return first_bitty_bit + second_bitty_bit

def _mp_render_helper(container):
    """
    A little helper to get round the one iterator argument with
    multiprocessing.Pool.map.
    """
    state = container["state"]
    cls_name = container["cls_name"]
    args = container["args"]
    cls = CLASS_MAPPINGS[cls_name]
    return render_class(state, cls, args)

def render_class(state, cls, args):
    """
    Returns the result of the run_command method for the class passed.
    """
    try:
        instance = cls(args=args, state=State(
            logger=Logger(cls.__name__, state.logger.level),
            color=state.color,
            config=state.config))
    
    except Exception as e:
        state.logger.error(
            "Could not instantiate {0}, failed with error {1}".format(
                cls.__name__, e))
        return
    try:
        instance.run_command()
        return instance.render()
    except Exception as e:
        state.logger.error(
            "Could not render line for {0}, failed with error {1}".format(
                cls.__name__, e))

#------------ Display object ---------

class Archey(object):
    DISPLAY_PARSING_REGEX = "(?P<func>\w+)\((|(?P<args>[\w, /]+))\)"
    
    def __init__(self, config, options):
        log_level = lookup_level(options.log_level)
        logger = Logger("Core", log_level)
        
        self.display = config.get("core", "display_modules")
        colorscheme = options.color or config.get(
            "core", "color", fallback="blue")
        for key in COLORS.keys():
            if key == colorscheme:
                colorcode = COLORS[key]
        
        self.state = State(colorcode, config, logger)
        
        global PROCESSES
        PROCESSES = render_class(self.state, processCheck, ())
        
        distro_out = render_class(self.state, distroCheck, ())
        
        if not distro_out:
            self.state.logger.critical(
                "Unrecognised distribution.")
            raise RuntimeException("Unrecognised distribution.")
        
        self.distro_name = ' '.join(distro_out[1].split()[:-1])
    
    def run(self, screenshot_=False):
        """
        Actually print the logo etc, and take a screenshot if required.
        """
        print(self.render())
        
        if screenshot_:
            screenshot(self.state)
    
    def render(self):
        results = self.prepare_results()
        results = self.arrange_results(results)
        
        return LOGOS[self.distro_name].format(c1=color(self.state, 1),
                                              c2=color(self.state, 2),
                                              results = results
                                              )
    
    def prepare_results(self):
        """
        Renders all classes found in the display array, and then returns them
        as a list. The returned list will be exactly 18 items long, with any
        left over spaces being filled with empty strings.
        """
        poolsize = self.state.config.getint("core", "poolsize", fallback=5)
        
        pool = multiprocessing.Pool(poolsize)
        
        arguments = []
        for cls_name, args in self.parse_display():
            arguments.append({
                    'cls_name': cls_name,
                    'args': args,
                    'state': self.state
                    })
        raw_out = pool.map(_mp_render_helper, arguments)
        outputs = list(map(self.format_item,
                           filter(bool, raw_out)))
        
        
        return outputs + [""] * (18 - len(outputs))
    
    def arrange_results(self, results):
        """
        Arranges the results as specified in the config file.
        """
        arrangement = self.state.config.get("core", "align", fallback="top")
        if arrangement == "top":
            return results
        elif arrangement == "bottom":
            actuall_res = [res for res in results if res]
            return [""] * (len(results) - len(actuall_res)) + actuall_res
        elif arrangement == "center":
            actuall_res = [res for res in results if res]
            offset = [""] * int((len(results) - len(actuall_res)) / 2)
            return (offset + actuall_res +
                    [""] * (len(results) - len(actuall_res)))
        else:
            return results
    
    def parse_display(self):
        """
        Iterates over the display attribute of the Archey class, and tries to
        parse them using the DISPLAY_PARSING_REGEX.
        """
        for func in self.display.split(","):
            func = func.strip()
            
            info = re.match(self.DISPLAY_PARSING_REGEX, func)
            if not info:
                self.state.logger.error(
                    "Could not parse display string {0}".format(func))
                continue
            
            groups = info.groupdict()
            if groups["args"]:
                args = [arg.strip() for arg in groups["args"].split(",")]
            else:
                args = ()
            
            yield groups["func"], args
        raise StopIteration

    def format_item(self, item):
        title = item[0].rstrip(':')
        data = str(item[1]).rstrip()
        
        #if we're dealing with a fraction
        if len(data.split('/')) == 2:
            numerator = data.split('/')[0]
            numerator = (color(self.state, 1, bold=True) + numerator +
                         color(self.state, 'clear'))
            denominator = data.split('/')[1]
            data = '/'.join((numerator, denominator))
        
        return "{color}{title}:{clear} {data}".format(
                color=color(self.state, 1),
                title=title,
                data=data,
                clear=color(self.state, "clear")
        )

def main():
    parser = OptionParser(
        usage='%prog',
        description="""%prog is a utility to display system info and take\
 screenshots""",
        version="%prog 0.3")
    parser.add_option('-c', '--color',
            action='store', type='choice', dest='color',
            choices=('black',
                     'red',
                     'green',
                     'yellow',
                     'blue',
                     'magenta',
                     'cyan',
                     'white'),
            help="""choose a color: black, red, green, yellow, blue, magenta,\
            cyan, white [Default: blue]""")
    parser.add_option('-s', '--screenshot',
            action='store_true', dest='screenshot', help='Take a screenshot')
    parser.add_option('--config',
            action='store', dest='config', default=None,
            help="Set the location of the config file to load.")
    parser.add_option('--debug',
            action='store', type='choice', dest='log_level',
            choices=('NOTSET',
                     'DEBUG',
                     'INFO',
                     'WARNING',
                     'ERROR',
                     'CRITICAL'),
            default='CRITICAL',
            help="The level of errors you wish to display. Choices are\
 NOTSET, DEBUG, INFO, WARNING, ERROR, and CRITICAL. CRITICAL is the default.")
    (options, args) = parser.parse_args()
    
    config = ArcheyConfigParser()
    config.read(options.config)
    
    archey = Archey(config=config, options=options)
    archey.run(options.screenshot)

if __name__ == "__main__":
    main()