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

"""
Galleria directive
"""

import uuid
import json

from docutils import nodes
from docutils.parsers.rst import Directive
import docutils.parsers.rst.directives as directives

from sphinx.writers.html import HTMLTranslator
from sphinx.writers.latex import LaTeXTranslator
from sphinx.writers.texinfo import TexinfoTranslator
from sphinx.writers.text import TextTranslator
from sphinx.writers.manpage import ManualPageTranslator
from sphinx.util.osutil import relative_uri
from sphinx.locale import __


class galleria(nodes.General, nodes.Element):
    pass


def html_visit_galleria(self: HTMLTranslator, node: galleria) -> None:
    galleria_id = 'galleria-%s' % uuid.uuid4()

    self.body.append(
        "<div id='%s' class='%s' width='%s' height='%s'>" % (
            galleria_id,
            node['class'] + ' align-%s' % node['options']['align'],
            node['options']['width'],
            node['options']['height'],
        )
    )

    if len(node['images']) > 0:
        self.body.append("<figure><div class='row'>")
        self.body.append("<img src='%s' title='%s' alt='%s'>" % (
            node['images'][0]['image'],
            node['images'][0]['title'],
            node['images'][0]['alt']
        ))
        self.body.append('</div></figure>')

    self.body.append(
        "</div><script type='module'>" +
        "import {SphinxGalleria} from './%s';\n" %
        relative_uri(
            self.builder.get_target_uri(self.builder.current_docname),
            '_static/sphinxgalleria/sphinxgalleria.mjs') +
        "new SphinxGalleria('%s', %s, %s).init();</script>" % (
            galleria_id,
            json.dumps(node['options']),
            json.dumps(node['images'])
        )
    )

    raise nodes.SkipNode


def latex_visit_galleria(self: LaTeXTranslator, node: galleria) -> None:
    for image in node['images']:
        self.body.append('[%s]' % image['alt'])
    raise nodes.SkipNode


def texinfo_visit_galleria(self: TexinfoTranslator, node: galleria) -> None:
    for image in node['images']:
        self.body.append('[%s]' % image['alt'])
    raise nodes.SkipNode


def text_visit_galleria(self: TextTranslator, node: galleria) -> None:
    for image in node['images']:
        self.body.append('[%s]' % image['alt'])
    raise nodes.SkipNode


def gemini_visit_galleria(self, node: galleria) -> None:
    for image in node['images']:
        self.body.append('=> %s %s' % (image['path'], image['alt']))
    raise nodes.SkipNode


def man_visit_galleria(self: ManualPageTranslator, node: galleria) -> None:
    if 'alt' in node.attributes:
        self.body.append('[%s]' % node['alt'])
    raise nodes.SkipNode


def align_choices(argument):
    return directives.choice(argument, ('left', 'right', 'center'))


class GalleriaDirective(Directive):

    has_content = False
    required_arguments = 1
    final_argument_whitespace = True

    option_spec = {
        "class": directives.class_option,
        "galleria": directives.unchanged,
        "alt": directives.unchanged,
        "title": directives.unchanged,
        "thumbsize": directives.unchanged,
        "transition": directives.unchanged,
        'width': directives.length_or_percentage_or_unitless,
        'height': directives.length_or_unitless,
        'align': align_choices,
        'hide_title': directives.flag,
        'hide_alt': directives.flag,
    }

    def run(self):
        source = self.state.document.settings._source
        document = self.state.document
        if not document.hasattr('galleria_nodes'):
            document.galleria_nodes = {}
        if source not in document.galleria_nodes:
            document.galleria_nodes[source] = {}

        galleria_name = self.options.get('galleria') or uuid.uuid4()
        created = False

        if galleria_name in document.galleria_nodes[source]:
            node = document.galleria_nodes[source][galleria_name]

        else:
            node = galleria()
            node['class'] = 'galleria'
            node['options'] = {
                'transition': 'fade',
                'label_prev': __('Previous'),
                'label_next': __('Next'),
                'label_close': __('Close'),
                'label_thumbnail': __('Thumbnail, click to enlarge'),
            }
            node['images'] = []
            document.galleria_nodes[source][galleria_name] = node

            created = True

        if self.options.get('class'):
            node['class'] = self.options['class']
        if self.options.get('transition'):
            node['options']['transition'] = self.options['transition']

        node['options']["width"] = self.options.get('width') or 'auto'
        node['options']["height"] = self.options.get('height') or 'auto'
        node['options']["align"] = self.options.get('align') or 'center'

        images_path = self.arguments
        for path in images_path:
            image = {}
            image["alt"] = self.options.get('alt')
            image["title"] = self.options.get('title')
            image["thumbsize"] = self.options.get('thumbsize') or '100x100'
            image["hide_alt"] = bool(self.options.get('hide_alt'))
            image["hide_title"] = bool(self.options.get('hide_title'))
            image["image"] = path
            node['images'].append(image)

        if created:
            return [node]
        return []