import warnings

from django.template import (
    Context, Engine, TemplateDoesNotExist, TemplateSyntaxError, loader,
)
from django.test import SimpleTestCase, ignore_warnings
from django.utils.deprecation import RemovedInDjango21Warning

from ..utils import setup
from .test_basic import basic_templates

include_fail_templates = {
    'include-fail1': '{% load bad_tag %}{% badtag %}',
    'include-fail2': '{% load broken_tag %}',
}


class IncludeTagTests(SimpleTestCase):
    libraries = {'bad_tag': 'template_tests.templatetags.bad_tag'}

    @setup({'include01': '{% include "basic-syntax01" %}'}, basic_templates)
    def test_include01(self):
        output = self.engine.render_to_string('include01')
        self.assertEqual(output, 'something cool')

    @setup({'include02': '{% include "basic-syntax02" %}'}, basic_templates)
    def test_include02(self):
        output = self.engine.render_to_string('include02', {'headline': 'Included'})
        self.assertEqual(output, 'Included')

    @setup({'include03': '{% include template_name %}'}, basic_templates)
    def test_include03(self):
        output = self.engine.render_to_string(
            'include03',
            {'template_name': 'basic-syntax02', 'headline': 'Included'},
        )
        self.assertEqual(output, 'Included')

    @setup({'include04': 'a{% include "nonexistent" %}b'})
    def test_include04(self):
        template = self.engine.get_template('include04')

        if self.engine.debug:
            with self.assertRaises(TemplateDoesNotExist):
                template.render(Context({}))
        else:
            with warnings.catch_warnings(record=True) as warns:
                warnings.simplefilter('always')
                output = template.render(Context({}))

            self.assertEqual(output, "ab")

            self.assertEqual(len(warns), 1)
            self.assertEqual(
                str(warns[0].message),
                "Rendering {% include 'include04' %} raised "
                "TemplateDoesNotExist. In Django 2.1, this exception will be "
                "raised rather than silenced and rendered as an empty string.",
            )

    @setup({
        'include 05': 'template with a space',
        'include06': '{% include "include 05"%}',
    })
    def test_include06(self):
        output = self.engine.render_to_string('include06')
        self.assertEqual(output, "template with a space")

    @setup({'include07': '{% include "basic-syntax02" with headline="Inline" %}'}, basic_templates)
    def test_include07(self):
        output = self.engine.render_to_string('include07', {'headline': 'Included'})
        self.assertEqual(output, 'Inline')

    @setup({'include08': '{% include headline with headline="Dynamic" %}'}, basic_templates)
    def test_include08(self):
        output = self.engine.render_to_string('include08', {'headline': 'basic-syntax02'})
        self.assertEqual(output, 'Dynamic')

    @setup(
        {'include09': '{{ first }}--'
                      '{% include "basic-syntax03" with first=second|lower|upper second=first|upper %}'
                      '--{{ second }}'},
        basic_templates,
    )
    def test_include09(self):
        output = self.engine.render_to_string('include09', {'first': 'Ul', 'second': 'lU'})
        self.assertEqual(output, 'Ul--LU --- UL--lU')

    @setup({'include10': '{% include "basic-syntax03" only %}'}, basic_templates)
    def test_include10(self):
        output = self.engine.render_to_string('include10', {'first': '1'})
        if self.engine.string_if_invalid:
            self.assertEqual(output, 'INVALID --- INVALID')
        else:
            self.assertEqual(output, ' --- ')

    @setup({'include11': '{% include "basic-syntax03" only with second=2 %}'}, basic_templates)
    def test_include11(self):
        output = self.engine.render_to_string('include11', {'first': '1'})
        if self.engine.string_if_invalid:
            self.assertEqual(output, 'INVALID --- 2')
        else:
            self.assertEqual(output, ' --- 2')

    @setup({'include12': '{% include "basic-syntax03" with first=1 only %}'}, basic_templates)
    def test_include12(self):
        output = self.engine.render_to_string('include12', {'second': '2'})
        if self.engine.string_if_invalid:
            self.assertEqual(output, '1 --- INVALID')
        else:
            self.assertEqual(output, '1 --- ')

    @setup(
        {'include13': '{% autoescape off %}{% include "basic-syntax03" %}{% endautoescape %}'},
        basic_templates,
    )
    def test_include13(self):
        output = self.engine.render_to_string('include13', {'first': '&'})
        if self.engine.string_if_invalid:
            self.assertEqual(output, '& --- INVALID')
        else:
            self.assertEqual(output, '& --- ')

    @setup(
        {'include14': '{% autoescape off %}'
                      '{% include "basic-syntax03" with first=var1 only %}'
                      '{% endautoescape %}'},
        basic_templates,
    )
    def test_include14(self):
        output = self.engine.render_to_string('include14', {'var1': '&'})
        if self.engine.string_if_invalid:
            self.assertEqual(output, '& --- INVALID')
        else:
            self.assertEqual(output, '& --- ')

    # Include syntax errors
    @setup({'include-error01': '{% include "basic-syntax01" with %}'})
    def test_include_error01(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('include-error01')

    @setup({'include-error02': '{% include "basic-syntax01" with "no key" %}'})
    def test_include_error02(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('include-error02')

    @setup({'include-error03': '{% include "basic-syntax01" with dotted.arg="error" %}'})
    def test_include_error03(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('include-error03')

    @setup({'include-error04': '{% include "basic-syntax01" something_random %}'})
    def test_include_error04(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('include-error04')

    @setup({'include-error05': '{% include "basic-syntax01" foo="duplicate" foo="key" %}'})
    def test_include_error05(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('include-error05')

    @setup({'include-error06': '{% include "basic-syntax01" only only %}'})
    def test_include_error06(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('include-error06')

    @setup(include_fail_templates)
    def test_include_fail1(self):
        with self.assertRaises(RuntimeError):
            self.engine.get_template('include-fail1')

    @setup(include_fail_templates)
    def test_include_fail2(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template('include-fail2')

    @setup({'include-error07': '{% include "include-fail1" %}'}, include_fail_templates)
    def test_include_error07(self):
        template = self.engine.get_template('include-error07')

        if self.engine.debug:
            with self.assertRaises(RuntimeError):
                template.render(Context())
        else:
            with ignore_warnings(category=RemovedInDjango21Warning):
                self.assertEqual(template.render(Context()), '')

    @setup({'include-error08': '{% include "include-fail2" %}'}, include_fail_templates)
    def test_include_error08(self):
        template = self.engine.get_template('include-error08')

        if self.engine.debug:
            with self.assertRaises(TemplateSyntaxError):
                template.render(Context())
        else:
            with ignore_warnings(category=RemovedInDjango21Warning):
                self.assertEqual(template.render(Context()), '')

    @setup({'include-error09': '{% include failed_include %}'}, include_fail_templates)
    def test_include_error09(self):
        context = Context({'failed_include': 'include-fail1'})
        template = self.engine.get_template('include-error09')

        if self.engine.debug:
            with self.assertRaises(RuntimeError):
                template.render(context)
        else:
            with ignore_warnings(category=RemovedInDjango21Warning):
                self.assertEqual(template.render(context), '')

    @setup({'include-error10': '{% include failed_include %}'}, include_fail_templates)
    def test_include_error10(self):
        context = Context({'failed_include': 'include-fail2'})
        template = self.engine.get_template('include-error10')

        if self.engine.debug:
            with self.assertRaises(TemplateSyntaxError):
                template.render(context)
        else:
            with ignore_warnings(category=RemovedInDjango21Warning):
                self.assertEqual(template.render(context), '')


class IncludeTests(SimpleTestCase):

    def test_include_missing_template(self):
        """
        The correct template is identified as not existing
        when {% include %} specifies a template that does not exist.
        """
        engine = Engine(app_dirs=True, debug=True)
        template = engine.get_template('test_include_error.html')
        with self.assertRaises(TemplateDoesNotExist) as e:
            template.render(Context())
        self.assertEqual(e.exception.args[0], 'missing.html')

    def test_extends_include_missing_baseloader(self):
        """
        #12787 -- The correct template is identified as not existing
        when {% extends %} specifies a template that does exist, but that
        template has an {% include %} of something that does not exist.
        """
        engine = Engine(app_dirs=True, debug=True)
        template = engine.get_template('test_extends_error.html')
        with self.assertRaises(TemplateDoesNotExist) as e:
            template.render(Context())
        self.assertEqual(e.exception.args[0], 'missing.html')

    def test_extends_include_missing_cachedloader(self):
        engine = Engine(debug=True, loaders=[
            ('django.template.loaders.cached.Loader', [
                'django.template.loaders.app_directories.Loader',
            ]),
        ])

        template = engine.get_template('test_extends_error.html')
        with self.assertRaises(TemplateDoesNotExist) as e:
            template.render(Context())
        self.assertEqual(e.exception.args[0], 'missing.html')

        # Repeat to ensure it still works when loading from the cache
        template = engine.get_template('test_extends_error.html')
        with self.assertRaises(TemplateDoesNotExist) as e:
            template.render(Context())
        self.assertEqual(e.exception.args[0], 'missing.html')

    def test_include_template_argument(self):
        """
        Support any render() supporting object
        """
        engine = Engine()
        ctx = Context({
            'tmpl': engine.from_string('This worked!'),
        })
        outer_tmpl = engine.from_string('{% include tmpl %}')
        output = outer_tmpl.render(ctx)
        self.assertEqual(output, 'This worked!')

    def test_include_from_loader_get_template(self):
        tmpl = loader.get_template('include_tpl.html')  # {% include tmpl %}
        output = tmpl.render({'tmpl': loader.get_template('index.html')})
        self.assertEqual(output, 'index\n\n')

    def test_include_immediate_missing(self):
        """
        #16417 -- Include tags pointing to missing templates should not raise
        an error at parsing time.
        """
        Engine(debug=True).from_string('{% include "this_does_not_exist.html" %}')

    def test_include_recursive(self):
        comments = [
            {
                'comment': 'A1',
                'children': [
                    {'comment': 'B1', 'children': []},
                    {'comment': 'B2', 'children': []},
                    {'comment': 'B3', 'children': [
                        {'comment': 'C1', 'children': []}
                    ]},
                ]
            }
        ]
        engine = Engine(app_dirs=True)
        t = engine.get_template('recursive_include.html')
        self.assertEqual(
            "Recursion!  A1  Recursion!  B1   B2   B3  Recursion!  C1",
            t.render(Context({'comments': comments})).replace(' ', '').replace('\n', ' ').strip(),
        )

    def test_include_cache(self):
        """
        {% include %} keeps resolved templates constant (#27974). The
        CounterNode object in the {% counter %} template tag is created once
        if caching works properly. Each iteration increases the counter instead
        of restarting it.

        This works as a regression test only if the cached loader
        isn't used, so the @setup decorator isn't used.
        """
        engine = Engine(loaders=[
            ('django.template.loaders.locmem.Loader', {
                'template': '{% for x in vars %}{% include "include" %}{% endfor %}',
                'include': '{% include "next" %}',
                'next': '{% load custom %}{% counter %}'
            }),
        ], libraries={'custom': 'template_tests.templatetags.custom'})
        output = engine.render_to_string('template', dict(vars=range(9)))
        self.assertEqual(output, '012345678')
