# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>

from elementmaker import E
from dom import set_css, clear, build_rule
from gettext import gettext as _
from book_list.theme import get_color, get_font_size

modal_container = None

class ModalContainer:

    def __init__(self):
        div = E.div(id='modal-container',
            E.div(  # popup
                E.div(),  # content area
                E.a(E.i(class_='fa fa-close', style='vertical-align:bottom;'), title=_('Close'))
            ),
            E.style(
                build_rule(
                    '#modal-container > div > a:hover',
                    color=get_color('dialog-foreground') + ' !important',
                    background_color=get_color('dialog-background') + ' !important'
                ) +
                build_rule(
                    '#modal-container a.dialog-simple-link:hover', color='red !important'
                )
            )
        )
        document.body.appendChild(div)

        # Container style
        set_css(div,
            position='fixed', top='0', right='0', bottom='0', left='0', # Stretch over entire window
            background_color='rgba(0,0,0,0.8)', z_index='1000',
            display='none', text_align='center', user_select='none'
        )

        # Popup style
        set_css(div.firstChild,
            position='relative', display='inline-block', top='50vh', transform='translateY(-50%)',
            min_width='25vw', max_width='75vw',
            border_radius='1em', padding='1em 2em', margin_right='1em', margin_left='1em',
            background=get_color('dialog-background'), color=get_color('dialog-foreground'),
            background_image=get_color('dialog-background-image'), get_color('dialog-background'), get_color('dialog-background2')
        )

        # Close button style
        set_css(div.firstChild.lastChild,
            font_size='1.5em', line_height='100%', cursor='pointer', position='absolute',
            right='-0.5em', top='-0.5em', width='1em', height='1em',
            background_color=get_color('window-foreground'), color=get_color('window-background'), display='inline-box',
            border_radius='50%', padding='4px', text_align='center', box_shadow='1px 1px 3px black'
        )
        div.firstChild.lastChild.addEventListener('click', def(event): event.preventDefault(), self.close_modal(event);)

        # Content container style
        set_css(div.firstChild.firstChild, user_select='text', max_height='60vh', overflow='auto')

        self.modals = v'[]'
        self.current_modal = None
        self.hide = self.close_modal.bind(self)

    @property
    def modal_container(self):
        return document.getElementById('modal-container')

    def show_modal(self, create_func, on_close=None):
        self.modals.push(v'[create_func, on_close]')
        self.update()

    def update(self):
        if self.current_modal is None and self.modals:
            self.current_modal = self.modals.shift()
            c = self.modal_container
            try:
                self.current_modal[0](c.firstChild.firstChild, self.hide)
            except:
                self.current_modal = None
                raise
            if c.style.display == 'none':
                set_css(c, display='block')

    def close_modal(self, event):
        if self.current_modal is not None:
            if self.current_modal[1] is not None and self.current_modal[1](event) is True:
                return
            self.current_modal = None
            c = self.modal_container
            clear(c.firstChild.firstChild)
            if self.modals.length == 0:
                set_css(c, display='none')
            else:
                self.update()

def create_simple_dialog(title, msg, details, icon_name, prefix):
    details = details or ''
    def create_func(parent):
        show_details = E.a(class_='dialog-simple-link', style='cursor:pointer; color: blue; padding-top:1em; display:inline-block; margin-left: auto', _('Show details'))
        show_details.addEventListener('click', def():
            show_details.style.display = 'none'
            show_details.nextSibling.style.display = 'block'
        )
        is_html_msg = /<[a-zA-Z]/.test(msg)
        html_container = E.div()
        if is_html_msg:
            html_container.innerHTML = msg
        parent.appendChild(
            E.div(
                style='max-width:60em; text-align: left',
                E.h2(
                    E.i(class_='fa fa-lg fa-' + icon_name, style='color:red'), E.span('\xa0' + prefix + '\xa0', style='font-variant:small-caps'), title,
                    style='font-weight: bold; font-size: ' + get_font_size('title')
                ),
                E.div((html_container if is_html_msg else msg), style='padding-top: 1em; margin-top: 1em; border-top: 1px solid currentColor'),
                E.div(style='display: ' + ('block' if details else 'none'),
                    show_details,
                    E.div(details,
                          style='display:none; white-space:pre-wrap; font-size: smaller; margin-top: 1em; border-top: solid 1px currentColor; padding-top: 1em'
                    )
                )
            )
        )
    show_modal(create_func)

def error_dialog(title, msg, details=None):
    create_simple_dialog(title, msg, details, 'bug', _('Error:'))

def warning_dialog(title, msg, details=None):
    create_simple_dialog(title, msg, details, 'warning', _('Warning:'))

# def test_error():
#     error_dialog(
#         'Hello, world!',
#         'Some long text to test rendering/line breaking in error dialogs that contain lots of text like this test error dialog from hell in a handbasket with fruits and muppets making a scene.',
#         ['a word ' for i in range(10000)].join(' ')
#     )

def create_modal_container():
    nonlocal modal_container
    if modal_container is None:
        modal_container = ModalContainer()
    # window.setTimeout(def():
    #     document.getElementById('books-view-1').addEventListener('click', test_error)
    # , 10)
    return modal_container

def show_modal(create_func, on_close=None):
    modal_container.show_modal(create_func, on_close)