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

import os
import re
import string
import subprocess

from .Extractor import ArchiveError, CRCError, Extractor, PasswordError
from .misc import Popen, decode, fs_encode, fsjoin, renice


class UnRar(Extractor):
    __name__ = "UnRar"
    __type__ = "extractor"
    __version__ = "1.44"
    __status__ = "testing"

    __config__ = [("ignore_warnings", "bool", "Ignore unrar warnings", False)]

    __description__ = """RAR extractor plugin"""
    __license__ = "GPLv3"
    __authors__ = [("RaNaN", "RaNaN@pyload.org"),
                   ("Walter Purcaro", "vuolter@gmail.com"),
                   ("Immenz", "immenz@gmx.net"),
                   ("GammaCode", "nitzo2001[AT]yahoo[DOT]com")]

    CMD = "unrar"
    EXTENSIONS = ["rar", "cab", "arj", "lzh", "tar", "gz", "ace", "uue",
                  "bz2", "jar", "iso", "xz", "z"]

    _RE_PART = re.compile(r'\.(part|r)\d+(\.rar|\.rev)?(\.bad)?|\.rar$', re.I)
    _RE_FIXNAME = re.compile(r'Building (.+)')
    _RE_FILES_V4 = re.compile(r'^([* ])(.+?)\s+(\d+)\s+(\d+)\s+(\d+%|-->|<--)\s+([\d-]+)\s+([\d:]+)\s*([ACHIRS.rw\-]+)\s+([0-9A-F]{8})\s+(\w+)\s+([\d.]+)', re.M)
    _RE_FILES_V5 = re.compile(r'^([* ])\s*([ACHIRS.rw\-]+)\s+(\d+)(?:\s+\d+)?(?:\s+(?:\d+%|-->|<--))?\s+([\d-]+)\s+([\d:]+)(?:\s+[0-9A-F]{8})?\s+(.+)', re.M)
    _RE_BADPWD = re.compile(r'password', re.I)
    _RE_BADCRC = re.compile(r'encrypted|damaged|CRC failed|checksum error|corrupt', re.I)
    _RE_VERSION = re.compile(r'(?:UN)?RAR\s(\d+\.\d+)', re.I)

    @classmethod
    def find(cls):
        try:
            if os.name == "nt":
                cls.CMD = os.path.join(pypath, "RAR.exe")
            else:
                cls.CMD = "rar"

            p = Popen([cls.CMD],
                      stdout=subprocess.PIPE,
                      stderr=subprocess.PIPE)
            out, err = (_r.strip() if _r else "" for _r in p.communicate())
            # cls.__name__ = "RAR"
            cls.REPAIR = True

        except OSError:
            try:
                if os.name == "nt":
                    cls.CMD = os.path.join(pypath, "UnRAR.exe")
                else:
                    cls.CMD = "unrar"

                p = Popen([cls.CMD],
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
                out, err = (_r.strip() if _r else "" for _r in p.communicate())

            except OSError:
                return False

        m = cls._RE_VERSION.search(out)
        if m is not None:
            cls.VERSION = m.group(1)
            cls._RE_FILES = cls._RE_FILES_V4 if float(cls.VERSION) < 5 else cls._RE_FILES_V5

        return True

    @classmethod
    def ismultipart(cls, filename):
        return True if cls._RE_PART.search(filename) else False

    def verify(self, password=None):
        p = self.call_cmd("l", "-v", self.filename, password=password)
        out, err = (_r.strip() if _r else "" for _r in p.communicate())

        if self._RE_BADPWD.search(err):
            raise PasswordError

        if self._RE_BADCRC.search(err):
            raise CRCError(err)

        #: Output only used to check if passworded files are present
        for groups in self._RE_FILES.findall(out):
            if groups[0] == "*":
                raise PasswordError

    def repair(self):
        p = self.call_cmd("rc", self.filename)

        #: Communicate and retrieve stderr
        self.progress(p)
        out, err = (_r.strip() if _r else "" for _r in p.communicate())

        if err or p.returncode:
            p = self.call_cmd("r", self.filename)

            # communicate and retrieve stderr
            self.progress(p)
            out, err = (_r.strip() if _r else "" for _r in p.communicate())

            if err or p.returncode:
                return False

            else:
                dir = os.path.dirname(self.filename)
                name = self._RE_FIXNAME.search(out).group(1)

                self.filename = os.path.join(dir, name)

        return True

    def progress(self, process):
        s = ""
        while True:
            c = process.stdout.read(1)
            #: Quit loop on eof
            if not c:
                break
            #: Reading a percentage sign -> set progress and restart
            if c == "%" and s:
                self.pyfile.setProgress(int(s))
                s = ""
            #: Not reading a digit -> therefore restart
            elif c not in string.digits:
                s = ""
            #: Add digit to progressstring
            else:
                s += c

    def extract(self, password=None):
        command = "x" if self.fullpath else "e"

        p = self.call_cmd(command, self.filename, self.dest, password=password)

        #: Communicate and retrieve stderr
        self.progress(p)
        out, err = (_r.strip() if _r else "" for _r in p.communicate())

        if err:
            if self._RE_BADPWD.search(err):
                raise PasswordError

            elif self._RE_BADCRC.search(err):
                raise CRCError(err)

            elif self.config.get('ignore_warnings', False) and err.startswith("WARNING:"):
                pass

            else:  #: Raise error if anything is on stderr
                raise ArchiveError(err)

        if p.returncode:
            raise ArchiveError(_("Process return code: %d") % p.returncode)

        return self.list(password)

    def chunks(self):
        files = []
        dir, name = os.path.split(self.filename)

        #: eventually Multipart Files
        files.extend(fsjoin(dir, os.path.basename(_f))
                     for _f in filter(self.ismultipart, os.listdir(dir))
                     if self._RE_PART.sub("", name) == self._RE_PART.sub("", _f))

        #: Actually extracted file
        if self.filename not in files:
            files.append(self.filename)

        return files

    def list(self, password=None):
        command = "v" if self.fullpath else "l"

        p = self.call_cmd(command, "-v", self.filename, password=password)
        out, err = (_r.strip() if _r else "" for _r in p.communicate())

        if "Cannot open" in err:
            raise ArchiveError(_("Cannot open file"))

        if err:  #: Only log error at this point
            self.log_error(err)

        files = set()
        f_grp = 5 if float(self.VERSION) >= 5 else 1
        for groups in self._RE_FILES.findall(decode(out)):
            f = groups[f_grp].strip()
            if not self.fullpath:
                f = os.path.basename(f)
            files.add(fsjoin(self.dest, f))
        self.files = list(files)
        return self.files

    def call_cmd(self, command, *xargs, **kwargs):
        args = []

        #: Overwrite flag
        if self.overwrite:
            args.append("-o+")
        else:
            args.append("-o-")
            args.append("-or")

        for word in self.excludefiles:
            args.append("-x%s" % word.strip())

        #: Assume yes on all queries
        args.append("-y")

        #: Disable comments show
        args.append("-c-")

        #: Set a password
        password = kwargs.get('password')

        if password:
            args.append("-p%s" % password)
        else:
            args.append("-p-")

        if self.keepbroken:
            args.append("-kb")

        #@NOTE: return codes are not reliable, some kind of threading, cleanup whatever issue
        call = [self.CMD, command] + args + list(xargs)
        self.log_debug("EXECUTE " + " ".join(call))

        call = map(fs_encode, call)
        p = Popen(
            call,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE)

        renice(p.pid, self.priority)

        return p
