#-*- coding: utf-8 -*-

# Copyright 2008-2013 Calculate Ltd. http://www.calculate-linux.org
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

import os
import re
from os import path
from calculate.lib.datavars import Variable,VariableError,ReadonlyVariable
from calculate.lib.utils.files import process, readLinesFile,FilesError
from calculate.lib.utils.common import (getAvailableVideo, getValueFromCmdLine,
                getVideoFromXorgLog, getVideoFromXorgConf, getVideoFromCmdLine,
                getCompositeFromXorgconf,getTupleVersion,
                getVideoFromModules, getVideoFromVendor,getInstalledVideo)
from calculate.lib.utils.portage import isPkgInstalled
from math import sqrt

class VariableOsX11Resolution(Variable):
    """
    X11 resolution (1024x768 and etc)
    """
    def getResByXDpyInfo(self):
        """Get resolution by xdpyinfo utility"""
        try:
            processXDpy = process('xdpyinfo')
            if processXDpy.failed():
                return ""
        except (FilesError,OSError) as e:
            return ""
        lines = processXDpy.readlines()
        reRes = re.compile("dimensions:\s+(\d+)x(\d+)\s+pixels")
        searchRes=False
        for line in lines:
            searchRes = reRes.search(line)
            if searchRes:
                break
        if searchRes:
            return "%sx%s"%(searchRes.group(1), searchRes.group(2))
        return ""

    def get(self):
        """
        Return current screen resolution (width, height).
        Try detect by xdpyinfo, then Xorg.log, xorg.conf
        """
        resolution = self.getResByXDpyInfo() 
        if resolution:
            return resolution
        if self.Get('os_root_type') != 'usb-hdd':
            xlog = "/var/log/Xorg.0.log"
            if os.access(xlog,os.R_OK):
                reXorgLogParser = re.compile("""
                    Virtual\ screen\ size\ determined\ to\ be
                    \ ([0-9]+)\s*x\s*([0-9]+)|
                    Setting\ mode\ "(\d+)x(\d+)[0-9\@]"|
                    Output\ [\S]+\ using\ initial\ mode\ (\d+)x(\d+)|
                    Virtual\ size\ is\ (\d+)x(\d+)""", re.X | re.S)
                resXorgLogParser = reXorgLogParser.search(open(xlog,'r').read())
                if resXorgLogParser:
                    return "%sx%s"%filter(lambda x:x,
                                   resXorgLogParser.groups())[:2]

            # get resolution from xorg.conf
            xorgconf = "/etc/X11/xorg.conf"
            reScreenSections = re.compile('Section "Screen"(.*?)EndSection',
                                          re.S)
            reModes = re.compile('Modes\s+"(\d+x\d+)')
            if os.access(xorgconf,os.R_OK):
                sectionsScreen = filter(lambda x:"Modes" in x,
                    reScreenSections.findall(open('/etc/X11/xorg.conf',
                                             'r').read()))
                modes = map(lambda x:x.groups()[0],
                            filter(lambda x:x,
                                   map(reModes.search, sectionsScreen)))
                if modes:
                    return max(modes,key=lambda x:int(x.partition('x')[0]))

        # get resolution from command line
        reRightResolution = re.compile("^(\d+x\d+|auto)$",re.S)
        kernelResolution = getValueFromCmdLine("calculate",3)
        if kernelResolution and reRightResolution.match(kernelResolution):
            return {'auto':''}.get(kernelResolution,kernelResolution)
        else:
            return ""

class VariableOsX11Height(ReadonlyVariable):
    """
    Vertical resolution for X server
    """
    def get(self):
        return self.Get('os_x11_resolution').partition('x')[2] or "768"

class VariableOsX11Width(ReadonlyVariable):
    """
    Horizontal resolution for X server
    """
    def get(self):
        return self.Get('os_x11_resolution').partition('x')[0] or "1024"

class VariableOsX11Standart(ReadonlyVariable):
    """
    Nearest standard size of image relative current
    """
    def get(self):
        widthVal = self.Get('os_x11_width')
        heightVal = self.Get('os_x11_height')
        if not widthVal or not heightVal:
            return ""
        width = int(widthVal)
        height = int(heightVal)
        gep = sqrt(height**2+width**2)
        k = float(width)/float(height)
        for themePkg in ['media-gfx/cldx-themes',
                         'media-gfx/cld-themes',
                         'media-gfx/cldg-themes']:
            installed = isPkgInstalled(themePkg,
                                       prefix=self.Get('cl_chroot_path'))
            if installed and \
                getTupleVersion(installed[0]['PV']) < getTupleVersion("12"):
                res = [(1024,600), (1024,768),
                       (1280,1024), (1280,800),
                       (1366,768), (1440,900),
                       (1600,1200), (1680,1050),
                       (1920,1200)] 
                break
        else:
            res = [(1024,576), (1024,600),
                   (1024,768), (1200,800), (1280,1024),
                   (1280,720), (1280,768), (1280,800),
                   (1360,768), (1366,768), (1368,768),
                   (1400,1050), (1440,900), (1600,1200),
                   (1600,768), (1600,900), (1680,1050),
                   (1680,945), (1920,1080), (1920,1200),
                   (2048,1152), (2560,1440), (2560,1600),
                   (640,480), (800,480) ]
        bestRes = min(res,
                  key=lambda x:(abs(x[0]/float(x[1])-k),
                                abs(gep-sqrt(x[0]**2+x[1]**2))))
        return "%sx%s"%bestRes

class VariableOsX11Composite(ReadonlyVariable):
    """
    On or off composite mode
    """
    def get(self):
        state = getCompositeFromXorgconf('/')
        return state or "off"

class VariableOsX11VideoDrv(ReadonlyVariable):
    """
    Video driver used by xorg
    """
    def get(self):
        """Get video driver used by xorg"""
        list_video = getInstalledVideo('/')
        methods = ((getVideoFromXorgLog,('/',list_video)),
                   (getVideoFromXorgConf,('/',)),
                   (getVideoFromModules,()),
                   (getVideoFromCmdLine,()),
                   (getVideoFromVendor,(self.Get('hr_video'),list_video)))
        for func,args in methods:
            drv = func(*args)
            if drv in list_video:
                return drv
        return "other"