# -*- encoding: utf-8 -*-

import sublime
import sublime_plugin

import os.path
from html.parser import HTMLParser

from .lib import markdown2
from .escape_amp import *
from .functions import *
from .setting_names import *

__folder__ = os.path.dirname(__file__)

STYLE_FILE = os.path.join(os.path.dirname(__folder__), 'User',
                                          'MarkdownLivePreview.css')
DEFAULT_STYLE_FILE = os.path.join(__folder__, 'default.css')

def get_preview_name(md_view):
    name = md_view.name() \
           or os.path.basename(md_view.file_name()) \
           or 'Untitled'
    return name + '- Preview'

def create_preview(md_view):
    window = md_view.window()
    md_view_settings = md_view.settings()
    md_view_settings.set(JUST_CREATED, True)

    preview = window.new_file()
    preview.settings().set(IS_PREVIEW, True)
    preview.set_name(get_preview_name(md_view))
    preview.set_scratch(True)
    window.run_command('new_pane') # move to new group

    md_view_settings.set(PREVIEW_ID, preview.id())

    return preview

def hide_preview(md_view):
    window = md_view.window()
    if window is None:
        return
    mdvsettings = md_view.settings()
    preview_id = mdvsettings.get(PREVIEW_ID)
    mdvsettings.erase(PREVIEW_ID)
    preview = get_view_from_id(window, preview_id)
    if preview is None:
        return
    psettings = preview.settings()
    psettings.set(IS_HIDDEN, True)
    sublime.set_timeout(preview.close(), 250)

def get_style():
    if os.path.exists(STYLE_FILE):
        with open(STYLE_FILE) as fp:
            return fp.read()

    with open(DEFAULT_STYLE_FILE) as fp:
        content = fp.read()
    content = ''.join([line.strip() for line in content.splitlines()])
    return content + "pre code .space {color: var(--light-bg)}"

def show_html(md_view, preview):
    html = '<style>{}</style>\n{}'.format(get_style(),
            pre_with_br(markdown2.markdown(get_view_content(md_view),
                                           extras=['fenced-code-blocks',
                                                   'no-code-highlighting'])))

    # the option no-code-highlighting does not exists
    # in the official version of markdown2 for now
    # I personaly edited the file (markdown2.py:1743)

    html = html.replace('&nbsp;', '&nbspespace;') # save where are the spaces

    html = HTMLParser().unescape(html)

    html = escape_amp(html)

    # exception, again, because <pre> aren't supported by the phantoms
    html = html.replace('&nbspespace;', '<i class="space">.</i>')
    html = replace_img_src_base64(html)
    preview.erase_phantoms('markdown_preview')
    preview.add_phantom('markdown_preview',
                         sublime.Region(-1),
                         html,
                         sublime.LAYOUT_BLOCK,
                         lambda href: sublime.run_command('open_url',
                                                          {'url': href}))

    # set viewport position

    # 0 < y < 1
    y = md_view.text_to_layout(md_view.sel()[0].begin())[1] / md_view.layout_extent()[1]
    vector = [0, y * preview.layout_extent()[1]]
    # remove half of the viewport_extent.y to center it on the screen (verticaly)
    vector[1] -= preview.viewport_extent()[1] / 2
    vector[1] = mini(vector[1], 0)
    vector[1] += preview.line_height()
    preview.set_viewport_position(vector, animate=False)