# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.forms.widgets import flatatt

from .text import text_value


# Handle HTML and CSS manipulation


def split_css_classes(css_classes):
    """
    Turn string into a list of CSS classes
    """
    classes_list = text_value(css_classes).split(' ')
    return [c for c in classes_list if c]


def add_css_class(css_classes, css_class, prepend=False):
    """
    Add a CSS class to a string of CSS classes
    """
    classes_list = split_css_classes(css_classes)
    classes_to_add = [c for c in split_css_classes(css_class)
                      if c not in classes_list]
    if prepend:
        classes_list = classes_to_add + classes_list
    else:
        classes_list += classes_to_add
    return ' '.join(classes_list)


def remove_css_class(css_classes, css_class):
    """
    Remove a CSS class from a string of CSS classes
    """
    remove = set(split_css_classes(css_class))
    classes_list = [c for c in split_css_classes(css_classes)
                    if c not in remove]
    return ' '.join(classes_list)


def render_link_tag(url, rel='stylesheet', media='all'):
    """
    Build a link tag
    """
    return render_tag(
        'link',
        attrs={'href': url, 'rel': rel, 'media': media},
        close=False)


def render_tag(tag, attrs=None, content=None, close=True):
    """
    Render a HTML tag
    """
    builder = '<{tag}{attrs}>{content}'
    if content or close:
        builder += '</{tag}>'
    return builder.format(
        tag=tag,
        attrs=flatatt(attrs) if attrs else '',
        content=text_value(content),
    )