#!/usr/bin/env python3

# $Id$
# Author: Martin Blais <blais@furius.ca>
# Copyright: This module has been placed in the public domain.

"""
Test the `Publisher` facade and the ``publish_*`` convenience functions.
"""
import os.path
import pickle
from pathlib import Path
import sys
import unittest

if __name__ == '__main__':
    # prepend the "docutils root" to the Python library path
    # so we import the local `docutils` package.
    sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

import docutils
from docutils import core, nodes

# DATA_ROOT is ./test/data/ from the docutils root
DATA_ROOT = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'data')

test_document = """\
Test Document
=============

This is a test document with a broken reference: nonexistent_
"""
pseudoxml_output = """\
<document ids="test-document" names="test\\ document" source="<string>" title="Test Document">
    <title>
        Test Document
    <paragraph>
        This is a test document with a broken reference: \n\
        <problematic ids="problematic-1" refid="system-message-1">
            nonexistent_
    <section classes="system-messages">
        <title>
            Docutils System Messages
        <system_message backrefs="problematic-1" ids="system-message-1" level="3" line="4" source="<string>" type="ERROR">
            <paragraph>
                Unknown target name: "nonexistent".
"""
exposed_pseudoxml_output = """\
<document ids="test-document" internal:refnames="{'nonexistent': [<reference: <#text: 'nonexistent'>>]}" names="test\\ document" source="<string>" title="Test Document">
    <title>
        Test Document
    <paragraph>
        This is a test document with a broken reference: \n\
        <problematic ids="problematic-1" refid="system-message-1">
            nonexistent_
    <section classes="system-messages">
        <title>
            Docutils System Messages
        <system_message backrefs="problematic-1" ids="system-message-1" level="3" line="4" source="<string>" type="ERROR">
            <paragraph>
                Unknown target name: "nonexistent".
"""


class PublisherTests(unittest.TestCase):

    settings = {'_disable_config': True,
                'datestamp': False}

    def test_input_error_handling(self):
        # core.publish_cmdline(argv=['nonexisting/path'])
        # exits with a short message, if `traceback` is False,

        # pass IOErrors to calling application if `traceback` is True
        with self.assertRaises(IOError):
            core.publish_cmdline(argv=['nonexisting/path'],
                                 settings_overrides={'traceback': True})

    def test_output_error_handling(self):
        # pass IOErrors to calling application if `traceback` is True
        with self.assertRaises(docutils.io.OutputError):
            core.publish_cmdline(argv=[os.path.join(DATA_ROOT, 'include.txt'),
                                       'nonexisting/path'],
                                 settings_overrides={'traceback': True})

    def test_set_destination(self):
        # Exit if `_destination` and `output` settings conflict.
        publisher = core.Publisher()
        publisher.get_settings(output='out_name', _destination='out_name')
        # no conflict if both have same value:
        publisher.set_destination()
        # no conflict if both are overridden:
        publisher.set_destination(destination_path='winning_dest')
        # ... also sets _destination to 'winning_dest' -> conflict
        with self.assertRaises(SystemExit):
            publisher.set_destination()

    def test_destination_output_conflict(self):
        # Exit if positional argument and --output option conflict.
        settings = {'output': 'out_name'}
        with self.assertRaises(SystemExit):
            core.publish_cmdline(argv=['-', 'dest_name'],
                                 settings_overrides=settings)

    def test_publish_string_input_encoding(self):
        """Test handling of encoded input."""
        # Transparently decode `bytes` source (with "input_encoding" setting)
        # default: auto-detect, fallback utf-8
        # Output is encoded according to "output_encoding" setting.
        settings = dict(self.settings)
        source = 'test → me'
        expected = ('<document source="<string>">\n'
                    '    <paragraph>\n'
                    '        test → me\n').encode('utf-8')
        output = core.publish_string(source.encode('utf-16'),
                                     settings_overrides=settings)
        self.assertEqual(output, expected)

        # encoding declaration in source
        source = '.. encoding: latin1\n\nGrüße'
        # don't encode output (return `str`)
        settings['output_encoding'] = 'unicode'
        output = core.publish_string(source.encode('utf-16'),
                                     settings_overrides=settings)
        self.assertTrue(output.endswith('Grüße\n'))

    def test_publish_string_output_encoding(self):
        settings = dict(self.settings)
        settings['output_encoding'] = 'latin1'
        settings['output_encoding_error_handler'] = 'replace'
        source = 'Grüß → dich'
        expected = ('<document source="<string>">\n'
                    '    <paragraph>\n'
                    '        Grüß → dich\n')
        # encode output, return `bytes`
        output = bytes(core.publish_string(source,
                                           settings_overrides=settings))
        self.assertEqual(output, expected.encode('latin1', 'replace'))

    def test_publish_string_output_encoding_odt(self):
        """The ODT writer generates a zip archive, not a `str`.

        TODO: return `str` with document as "flat XML" (.fodt).
        """
        settings = dict(self.settings)
        settings['output_encoding'] = 'unicode'
        with self.assertRaises(AssertionError) as cm:
            core.publish_string('test', writer_name='odt',
                                settings_overrides=settings)
        self.assertIn('`data` is no `str` instance', str(cm.exception))


class PublishDoctreeTestCase(unittest.TestCase, docutils.SettingsSpec):

    settings_default_overrides = {
        '_disable_config': True,
        'warning_stream': docutils.io.NullOutput()}

    def test_publish_doctree(self):
        # Test `publish_doctree` and `publish_from_doctree`.

        # Produce the document tree.
        doctree = core.publish_doctree(
            source=test_document, reader_name='standalone',
            parser_name='restructuredtext', settings_spec=self,
            settings_overrides={'expose_internals':
                                ['refnames', 'do_not_expose'],
                                'report_level': 5})
        self.assertTrue(isinstance(doctree, nodes.document))

        # Confirm that transforms have been applied (in this case, the
        # DocTitle transform):
        self.assertTrue(isinstance(doctree[0], nodes.title))
        self.assertTrue(isinstance(doctree[1], nodes.paragraph))
        # Confirm that the Messages transform has not yet been applied:
        self.assertEqual(len(doctree), 2)

        # The `do_not_expose` attribute may not show up in the
        # pseudoxml output because the expose_internals transform may
        # not be applied twice.
        doctree.do_not_expose = 'test'
        # Write out the document:
        output = core.publish_from_doctree(
            doctree, writer_name='pseudoxml',
            settings_spec=self,
            settings_overrides={'expose_internals':
                                ['refnames', 'do_not_expose'],
                                'report_level': 1,
                                'output_encoding': 'unicode'})
        self.assertEqual(output, exposed_pseudoxml_output)

        # Test publishing parts using document as the source.
        parts = core.publish_parts(
            reader_name='doctree', source_class=docutils.io.DocTreeInput,
            source=doctree, source_path='test', writer_name='html',
            settings_spec=self)
        self.assertTrue(isinstance(parts, dict))

    def test_publish_pickle(self):
        # Test publishing a document tree with pickling and unpickling.

        # Produce the document tree.
        doctree = core.publish_doctree(
            source=test_document,
            reader_name='standalone',
            parser_name='restructuredtext',
            settings_spec=self)
        self.assertTrue(isinstance(doctree, nodes.document))

        # Pickle the document.  Note: if this fails, some unpickleable
        # reference has been added somewhere within the document tree.
        # If so, you need to fix that.
        #
        # Note: Please do not remove this test, this is an important
        # requirement, applications will be built on the assumption
        # that we can pickle the document.

        # Remove the reporter and the transformer before pickling.
        doctree.reporter = None
        doctree.transformer = None

        doctree_pickled = pickle.dumps(doctree)
        self.assertTrue(isinstance(doctree_pickled, bytes))
        del doctree

        # Unpickle the document.
        doctree_zombie = pickle.loads(doctree_pickled)
        self.assertTrue(isinstance(doctree_zombie, nodes.document))

        # Write out the document:
        output = core.publish_from_doctree(doctree_zombie,
                                           writer_name='pseudoxml',
                                           settings_spec=self)
        self.assertEqual(output.decode(), pseudoxml_output)


if __name__ == '__main__':
    unittest.main()