import ctypes
import os
import string
import traceback
import time

from couchpotato import CPLog
from couchpotato.api import addApiView
from couchpotato.core.event import addEvent
from couchpotato.core.helpers.encoding import sp, ss, toUnicode
from couchpotato.core.helpers.variable import getUserDir
from couchpotato.core.plugins.base import Plugin


log = CPLog(__name__)


if os.name == 'nt':
    import imp
    try:
        imp.find_module('win32file')
    except:
        # todo:: subclass ImportError for missing dependencies, vs. broken plugins?
        raise ImportError("Missing the win32file module, which is a part of the prerequisite \
            pywin32 package. You can get it from http://sourceforge.net/projects/pywin32/files/pywin32/")
    else:
        # noinspection PyUnresolvedReferences
        import win32file

autoload = 'FileBrowser'


class FileBrowser(Plugin):

    def __init__(self):
        self.soft_chroot_enabled = False

        self.soft_chroot = Plugin.conf(self, 'soft_chroot', section='core')
        if None != self.soft_chroot:
            self.soft_chroot = self.soft_chroot.strip()
            self.soft_chroot = self.soft_chroot.rstrip(os.path.sep) + os.path.sep
            self.soft_chroot_enabled = True

        addApiView('directory.list', self.view, docs = {
            'desc': 'Return the directory list of a given directory',
            'params': {
                'path': {'desc': 'The directory to scan'},
                'show_hidden': {'desc': 'Also show hidden files'}
            },
            'return': {'type': 'object', 'example': """{
    'is_root': bool, //is top most folder
    'parent': string, //parent folder of requested path
    'home': string, //user home folder
    'empty': bool, //directory is empty
    'dirs': array, //directory names
}"""}
        })

    def getDirectories(self, path = '/', show_hidden = True):

        # Return driveletters or root if path is empty
        if path == '/' or not path or path == '\\':
            if os.name == 'nt':
                return self.getDriveLetters()
            path = '/'

        dirs = []
        path = sp(path)
        for f in os.listdir(path):
            p = sp(os.path.join(path, f))
            if os.path.isdir(p) and ((self.is_hidden(p) and bool(int(show_hidden))) or not self.is_hidden(p)):
                dirs.append(toUnicode('%s%s' % (p, os.path.sep)))

        return sorted(dirs)

    def getFiles(self):
        pass

    def getDriveLetters(self):

        driveletters = []
        for drive in string.ascii_uppercase:
            if win32file.GetDriveType(drive + ':') in [win32file.DRIVE_FIXED, win32file.DRIVE_REMOTE, win32file.DRIVE_RAMDISK, win32file.DRIVE_REMOVABLE]:
                driveletters.append(drive + ':\\')

        return driveletters

    def soft_chroot_is_subdir(self, path):
        if None == path:
            return False

        if not path.endswith(os.path.sep):
            path += os.path.sep

        return path.startswith(self.soft_chroot)

    def soft_chroot_add(self, path):
        if None == path or len(path)==0:
            return self.soft_chroot

        if not path.startswith(os.path.sep):
            raise ValueError("path must starts with '/'")

        return self.soft_chroot[:-1] + path

    def soft_chroot_cut(self, path):
        if None == path or 0==len(path):
            raise ValueError('path is empty')

        if path == self.soft_chroot.rstrip(os.path.sep):
            return '/'

        if not path.startswith(self.soft_chroot):
            raise ValueError("path must starts with soft_chroot")

        l = len(self.soft_chroot)-1

        return path[l:]

    def view(self, path = '/', show_hidden = True, **kwargs):

        home = getUserDir()
        if self.soft_chroot_enabled:
            if not self.soft_chroot_is_subdir(home):
                home = self.soft_chroot

        if not path:
            path = home
            if path.endswith(os.path.sep):
                path = path.rstrip(os.path.sep)
        elif self.soft_chroot_enabled:
            path = self.soft_chroot_add(path)

        try:
            dirs = self.getDirectories(path = path, show_hidden = show_hidden)
        except:
            log.error('Failed getting directory "%s" : %s', (path, traceback.format_exc()))
            dirs = []

        if self.soft_chroot_enabled:
            dirs = map(self.soft_chroot_cut, dirs)

        parent = os.path.dirname(path.rstrip(os.path.sep))
        if parent == path.rstrip(os.path.sep):
            parent = '/'
        elif parent != '/' and parent[-2:] != ':\\':
            parent += os.path.sep

        # TODO : check on windows:
        is_root = path == '/'

        if self.soft_chroot_enabled:
            # path could contain '/' on end, and could not contain..
            # but in 'soft-chrooted' environment path could be included in chroot_dir only when it is root
            is_root = self.soft_chroot.startswith(path)

            # fix paths:
            if self.soft_chroot_is_subdir(parent):
                parent = self.soft_chroot_cut(parent)
            else:
                parent = os.path.sep

            home = self.soft_chroot_cut(home)

        return {
            'is_root': is_root,
            'empty': len(dirs) == 0,
            'parent': parent,
            'home': home,
            'platform': os.name,
            'dirs': dirs,
        }


    def is_hidden(self, filepath):
        name = ss(os.path.basename(os.path.abspath(filepath)))
        return name.startswith('.') or self.has_hidden_attribute(filepath)

    def has_hidden_attribute(self, filepath):

        result = False
        try:
            attrs = ctypes.windll.kernel32.GetFileAttributesW(sp(filepath)) #@UndefinedVariable
            assert attrs != -1
            result = bool(attrs & 2)
        except (AttributeError, AssertionError):
            pass
        except:
            log.error('Failed getting hidden attribute: %s', traceback.format_exc())

        return result