#!/usr/bin/env python
# -*- coding: utf-8 -*-

from secretary import Renderer

from datetime import datetime
import locale
from PIL import Image
import re

from django.conf import settings


RE_UNITS = re.compile("([.0-9]+)([a-z]+)")


def parse_value_unit(value):
    m = RE_UNITS.match(value)
    if not m:
        return None, None
    value, unit = m.groups()
    value = float(value)
    return value, unit


def human_date_filter(value):
    try:
        value = datetime.strptime(value, "%Y-%m-%d")
    except ValueError:
        return ""
    language_code = settings.LANGUAGE_CODE.split('-')
    language_code = language_code[0] + "_" + language_code[1].upper()
    for language_suffix in (".utf8", ""):
        try:
            locale.setlocale(locale.LC_TIME, language_code + language_suffix)
            break
        except locale.Error:
            pass
    return value.strftime(settings.DATE_FORMAT).decode("utf-8")


class IshtarSecretaryRenderer(Renderer):
    def __init__(self, *args, **kwargs):
        super(IshtarSecretaryRenderer, self).__init__(*args, **kwargs)
        self.media_callback = self.ishtar_media_loader
        self.environment.filters['human_date'] = human_date_filter

    def ishtar_media_loader(self, media, *args, **kwargs):
        image_file, mime = self.fs_loader(media, *args, **kwargs)
        if "width" in kwargs:
            kwargs['frame_attrs']['svg:width'] = kwargs["width"]
        if "height" in kwargs:
            kwargs['frame_attrs']['svg:height'] = kwargs["height"]
        if "keep_ratio" in args:
            image = Image.open(image_file.name)
            width, width_unit = parse_value_unit(
                kwargs['frame_attrs']['svg:width'])
            height, height_unit = parse_value_unit(
                kwargs['frame_attrs']['svg:height'])
            if "height" not in kwargs and width:
                new_height = width * image.height / image.width
                kwargs['frame_attrs']['svg:height'] = "{}{}".format(
                    new_height, width_unit
                )
            if "width" not in kwargs and height:
                new_width = height * image.width / image.height
                kwargs['frame_attrs']['svg:width'] = "{}{}".format(
                    new_width, height_unit
                )
        return image_file, mime