import hashlib
import os

from PyQt4 import QtGui

import state
from addresses import addBMIfNotPresent
from bmconfigparser import BMConfigParser

str_broadcast_subscribers = '[Broadcast subscribers]'
str_chan = '[chan]'


def identiconize(address):
    size = 48

    if not BMConfigParser().getboolean('bitmessagesettings', 'useidenticons'):
        return QtGui.QIcon()

    # If you include another identicon library, please generate an
    # example identicon with the following md5 hash:
    # 3fd4bf901b9d4ea1394f0fb358725b28

    identicon_lib = BMConfigParser().safeGet(
        'bitmessagesettings', 'identiconlib', 'qidenticon_two_x')

    # As an 'identiconsuffix' you could put "@bitmessge.ch" or "@bm.addr"
    # to make it compatible with other identicon generators. (Note however,
    # that E-Mail programs might convert the BM-address to lowercase first.)
    # It can be used as a pseudo-password to salt the generation of
    # the identicons to decrease the risk of attacks where someone creates
    # an address to mimic someone else's identicon.
    identiconsuffix = BMConfigParser().get('bitmessagesettings', 'identiconsuffix')
    if identicon_lib[:len('qidenticon')] == 'qidenticon':
        # originally by:
        # :Author:Shin Adachi <shn@glucose.jp>
        # Licesensed under FreeBSD License.
        # stripped from PIL and uses QT instead (by sendiulo, same license)
        import qidenticon
        icon_hash = hashlib.md5(
            addBMIfNotPresent(address) + identiconsuffix).hexdigest()
        use_two_colors = identicon_lib[:len('qidenticon_two')] == 'qidenticon_two'
        opacity = int(
            identicon_lib not in (
                'qidenticon_x', 'qidenticon_two_x',
                'qidenticon_b', 'qidenticon_two_b'
            )) * 255
        penwidth = 0
        image = qidenticon.render_identicon(
            int(icon_hash, 16), size, use_two_colors, opacity, penwidth)
        # filename = './images/identicons/'+hash+'.png'
        # image.save(filename)
        idcon = QtGui.QIcon()
        idcon.addPixmap(image, QtGui.QIcon.Normal, QtGui.QIcon.Off)
        return idcon
    elif identicon_lib == 'pydenticon':
        # Here you could load pydenticon.py
        # (just put it in the "src" folder of your Bitmessage source)
        from pydenticon import Pydenticon
        # It is not included in the source, because it is licensed under GPLv3
        # GPLv3 is a copyleft license that would influence our licensing
        # Find the source here:
        # https://github.com/azaghal/pydenticon
        # note that it requires pillow (or PIL) to be installed:
        # https://python-pillow.org/
        idcon_render = Pydenticon(
            addBMIfNotPresent(address) + identiconsuffix, size * 3)
        rendering = idcon_render._render()
        data = rendering.convert("RGBA").tostring("raw", "RGBA")
        qim = QtGui.QImage(data, size, size, QtGui.QImage.Format_ARGB32)
        pix = QtGui.QPixmap.fromImage(qim)
        idcon = QtGui.QIcon()
        idcon.addPixmap(pix, QtGui.QIcon.Normal, QtGui.QIcon.Off)
        return idcon


def avatarize(address):
    """
    Loads a supported image for the given address' hash form 'avatars' folder
    falls back to default avatar if 'default.*' file exists
    falls back to identiconize(address)
    """
    idcon = QtGui.QIcon()
    icon_hash = hashlib.md5(addBMIfNotPresent(address)).hexdigest()
    if address == str_broadcast_subscribers:
        # don't hash [Broadcast subscribers]
        icon_hash = address
    # https://www.riverbankcomputing.com/static/Docs/PyQt4/qimagereader.html#supportedImageFormats
    # QImageReader.supportedImageFormats ()
    extensions = [
        'PNG', 'GIF', 'JPG', 'JPEG', 'SVG', 'BMP', 'MNG', 'PBM', 'PGM', 'PPM',
        'TIFF', 'XBM', 'XPM', 'TGA']
    # try to find a specific avatar
    for ext in extensions:
        lower_hash = state.appdata + 'avatars/' + icon_hash + '.' + ext.lower()
        upper_hash = state.appdata + 'avatars/' + icon_hash + '.' + ext.upper()
        if os.path.isfile(lower_hash):
            idcon.addFile(lower_hash)
            return idcon
        elif os.path.isfile(upper_hash):
            idcon.addFile(upper_hash)
            return idcon
    # if we haven't found any, try to find a default avatar
    for ext in extensions:
        lower_default = state.appdata + 'avatars/' + 'default.' + ext.lower()
        upper_default = state.appdata + 'avatars/' + 'default.' + ext.upper()
        if os.path.isfile(lower_default):
            default = lower_default
            idcon.addFile(lower_default)
            return idcon
        elif os.path.isfile(upper_default):
            default = upper_default
            idcon.addFile(upper_default)
            return idcon
    # If no avatar is found
    return identiconize(address)