"""Tests for HTMLExporter"""

# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.

import re

from .base import ExportersTestsBase
from ..html import HTMLExporter

from traitlets.config import Config
from nbformat import v4


class TestHTMLExporter(ExportersTestsBase):
    """Tests for HTMLExporter"""
    
    exporter_class = HTMLExporter
    should_include_raw = ['html']

    def test_constructor(self):
        """
        Can a HTMLExporter be constructed?
        """
        HTMLExporter()


    def test_export(self):
        """
        Can a HTMLExporter export something?
        """
        (output, resources) = HTMLExporter().from_filename(self._get_notebook())
        assert len(output) > 0


    def test_export_basic(self):
        """
        Can a HTMLExporter export using the 'basic' template?
        """
        (output, resources) = HTMLExporter(template_file='basic').from_filename(self._get_notebook())
        assert len(output) > 0


    def test_export_full(self):
        """
        Can a HTMLExporter export using the 'full' template?
        """
        (output, resources) = HTMLExporter(template_file='full').from_filename(self._get_notebook())
        assert len(output) > 0

    def test_prompt_number(self):
        """
        Does HTMLExporter properly format input and output prompts?
        """
        (output, resources) = HTMLExporter(template_file='full').from_filename(
            self._get_notebook(nb_name="prompt_numbers.ipynb"))
        in_regex = r"In&nbsp;\[(.*)\]:"
        out_regex = r"Out\[(.*)\]:"

        ins = ["2", "10", "&nbsp;", "&nbsp;", "0"]
        outs = ["10"]

        assert re.findall(in_regex, output) == ins
        assert re.findall(out_regex, output) == outs
        
    def test_prompt_number(self):
        """
        Does HTMLExporter properly format input and output prompts?
        """
        no_prompt_conf = Config(
            {"TemplateExporter":{
                "exclude_input_prompt": True,
                "exclude_output_prompt": True,
                }
            }
        )
        exporter = HTMLExporter(config=no_prompt_conf, template_file='full')    
        (output, resources) = exporter.from_filename(
            self._get_notebook(nb_name="prompt_numbers.ipynb"))
        in_regex = r"In&nbsp;\[(.*)\]:"
        out_regex = r"Out\[(.*)\]:"

        assert not re.findall(in_regex, output)
        assert not re.findall(out_regex, output)

    def test_png_metadata(self):
        """
        Does HTMLExporter with the 'basic' template treat pngs with width/height metadata correctly?
        """
        (output, resources) = HTMLExporter(template_file='basic').from_filename(
            self._get_notebook(nb_name="pngmetadata.ipynb"))
        check_for_png = re.compile(r'<img src="[^"]*?"([^>]*?)>')
        result = check_for_png.search(output)
        attr_string = result.group(1)
        assert 'width' in attr_string
        assert 'height' in attr_string

    def test_javascript_output(self):
        nb = v4.new_notebook(
            cells=[
                v4.new_code_cell(
                    outputs=[v4.new_output(
                        output_type='display_data',
                        data={
                            'application/javascript': "javascript_output();"
                        }
                    )]
                )
            ]
        )
        (output, resources) = HTMLExporter(template_file='basic').from_notebook_node(nb)
        self.assertIn('javascript_output', output)

    def test_attachments(self):
        (output, resources) = HTMLExporter(template_file='basic').from_file(
            self._get_notebook(nb_name='attachment.ipynb')
        )
        check_for_png = re.compile(r'<img src="[^"]*?"([^>]*?)>')
        result = check_for_png.search(output)
        self.assertTrue(result.group(0).strip().startswith('<img src="data:image/png;base64,iVBOR'))
        self.assertTrue(result.group(1).strip().startswith('alt="image.png"'))

        check_for_data = re.compile(r'<img src="(?P<url>[^"]*?)"')
        results = check_for_data.findall(output)
        assert results[0] != results[1], 'attachments only need to be unique within a cell'
        assert 'image/svg' in results[1], 'second image should use svg'


    def test_custom_filter_highlight_code(self):
        # Overwriting filters takes place at: Exporter.from_notebook_node
        nb = v4.new_notebook()
        nb.cells.append(v4.new_code_cell("some_text"))

        def custom_highlight_code(source, language="python", metadata=None):
            return source + " ADDED_TEXT"

        filters = {
            "highlight_code": custom_highlight_code
        }
        (output, resources) = HTMLExporter(template_file='basic', filters=filters).from_notebook_node(nb)
        self.assertTrue("ADDED_TEXT" in output)

