import sys
import unittest
from typing import Optional

try:
    from tools.lib.template_parser import (
        TemplateParserError,
        is_django_block_tag,
        tokenize,
        validate,
    )
except ImportError:
    print("ERROR!!! You need to run this via tools/test-tools.")
    sys.exit(1)


class ParserTest(unittest.TestCase):
    def _assert_validate_error(
        self,
        error: str,
        fn: Optional[str] = None,
        text: Optional[str] = None,
    ) -> None:
        with self.assertRaisesRegex(TemplateParserError, error):
            validate(fn=fn, text=text)

    def test_is_django_block_tag(self) -> None:
        self.assertTrue(is_django_block_tag("block"))
        self.assertFalse(is_django_block_tag("not a django tag"))

    def test_validate_vanilla_html(self) -> None:
        """
        Verify that validate() does not raise errors for
        well-formed HTML.
        """
        my_html = """
            <table>
                <tr>
                <td>foo</td>
                </tr>
            </table>"""
        validate(text=my_html)

    def test_validate_handlebars(self) -> None:
        my_html = """
            {{#with stream}}
                <p>{{stream}}</p>
            {{/with}}
            """
        validate(text=my_html)

    def test_validate_handlebars_partial_block(self) -> None:
        my_html = """
            {{#> generic_thing }}
                <p>hello!</p>
            {{/generic_thing}}
            """
        validate(text=my_html)

    def test_validate_bad_handlebars_partial_block(self) -> None:
        my_html = """
            {{#> generic_thing }}
                <p>hello!</p>
            {{# generic_thing}}
            """
        self._assert_validate_error("Missing end tag for the token at row 4 13!", text=my_html)

    def test_validate_comment(self) -> None:
        my_html = """
            <!---
                <h1>foo</h1>
            -->"""
        validate(text=my_html)

    def test_validate_django(self) -> None:
        my_html = """
            {% include "some_other.html" %}
            {% if foo %}
                <p>bar</p>
            {% endif %}
            """
        validate(text=my_html)

        my_html = """
            {% block "content" %}
                {% with className="class" %}
                {% include 'foobar' %}
                {% endwith %}
            {% endblock %}
            """
        validate(text=my_html)

    def test_validate_no_start_tag(self) -> None:
        my_html = """
            foo</p>
        """
        self._assert_validate_error("No start tag", text=my_html)

    def test_validate_mismatched_tag(self) -> None:
        my_html = """
            <b>foo</i>
        """
        self._assert_validate_error(r"Mismatched tags: \(b != i\)", text=my_html)

    def test_validate_bad_indentation(self) -> None:
        my_html = """
            <p>
                foo
                </p>
        """
        self._assert_validate_error("Indentation for start/end tags does not match.", text=my_html)

    def test_validate_state_depth(self) -> None:
        my_html = """
            <b>
        """
        self._assert_validate_error("Missing end tag", text=my_html)

    def test_validate_incomplete_handlebars_tag_1(self) -> None:
        my_html = """
            {{# foo
        """
        self._assert_validate_error(
            '''Tag missing "}}" at line 2 col 13:"{{# foo
        "''',
            text=my_html,
        )

    def test_validate_incomplete_handlebars_tag_2(self) -> None:
        my_html = """
            {{# foo }
        """
        self._assert_validate_error('Tag missing "}}" at line 2 col 13:"{{# foo }\n"', text=my_html)

    def test_validate_incomplete_django_tag_1(self) -> None:
        my_html = """
            {% foo
        """
        self._assert_validate_error(
            '''Tag missing "%}" at line 2 col 13:"{% foo
        "''',
            text=my_html,
        )

    def test_validate_incomplete_django_tag_2(self) -> None:
        my_html = """
            {% foo %
        """
        self._assert_validate_error('Tag missing "%}" at line 2 col 13:"{% foo %\n"', text=my_html)

    def test_validate_incomplete_html_tag_1(self) -> None:
        my_html = """
            <b
        """
        self._assert_validate_error(
            '''Tag missing ">" at line 2 col 13:"<b
        "''',
            text=my_html,
        )

    def test_validate_incomplete_html_tag_2(self) -> None:
        my_html = """
            <a href="
        """
        my_html1 = """
            <a href=""
        """
        self._assert_validate_error(
            '''Tag missing ">" at line 2 col 13:"<a href=""
        "''',
            text=my_html1,
        )
        self._assert_validate_error(
            '''Unbalanced quotes at line 2 col 13:"<a href="
        "''',
            text=my_html,
        )

    def test_validate_empty_html_tag(self) -> None:
        my_html = """
            < >
        """
        self._assert_validate_error("Tag name missing", text=my_html)

    def test_code_blocks(self) -> None:
        # This is fine.
        my_html = """
            <code>
                x = 5
                y = x + 1
            </code>"""
        validate(text=my_html)

        # This is also fine.
        my_html = "<code>process_widgets()</code>"
        validate(text=my_html)

        # This is illegal.
        my_html = """
            <code>x =
            5</code>
            """
        self._assert_validate_error("Code tag is split across two lines.", text=my_html)

    def test_anchor_blocks(self) -> None:
        # This is allowed, although strange.
        my_html = """
            <a href="/some/url">
            Click here
            for more info.
            </a>"""
        validate(text=my_html)

        # This is fine.
        my_html = '<a href="/some/url">click here</a>'
        validate(text=my_html)

        # Even this is fine.
        my_html = """
            <a class="twitter-timeline" href="https://twitter.com/ZulipStatus"
                data-widget-id="443457763394334720"
                data-screen-name="ZulipStatus"
                >@ZulipStatus on Twitter</a>.
            """
        validate(text=my_html)

    def test_validate_jinja2_whitespace_markers_1(self) -> None:
        my_html = """
        {% if foo -%}
        this is foo
        {% endif %}
        """
        validate(text=my_html)

    def test_validate_jinja2_whitespace_markers_2(self) -> None:
        my_html = """
        {% if foo %}
        this is foo
        {%- endif %}
        """
        validate(text=my_html)

    def test_validate_jinja2_whitespace_markers_3(self) -> None:
        my_html = """
        {% if foo %}
        this is foo
        {% endif -%}
        """
        validate(text=my_html)

    def test_validate_jinja2_whitespace_markers_4(self) -> None:
        my_html = """
        {%- if foo %}
        this is foo
        {% endif %}
        """
        validate(text=my_html)

    def test_validate_mismatch_jinja2_whitespace_markers_1(self) -> None:
        my_html = """
        {% if foo %}
        this is foo
        {%- if bar %}
        """
        self._assert_validate_error("Missing end tag", text=my_html)

    def test_validate_jinja2_whitespace_type2_markers(self) -> None:
        my_html = """
        {%- if foo -%}
        this is foo
        {% endif %}
        """
        validate(text=my_html)

    def test_tokenize(self) -> None:
        tag = "<!DOCTYPE html>"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "html_doctype")

        tag = "<a>bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "html_start")
        self.assertEqual(token.tag, "a")

        tag = "<br />bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "html_singleton")
        self.assertEqual(token.tag, "br")

        tag = "<input>bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "html_start")  # We later mark this an error.
        self.assertEqual(token.tag, "input")

        tag = "<input />bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "html_singleton")
        self.assertEqual(token.tag, "input")

        tag = "</a>bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "html_end")
        self.assertEqual(token.tag, "a")

        tag = "{{#with foo}}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "handlebars_start")
        self.assertEqual(token.tag, "with")

        tag = "{{/with}}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "handlebars_end")
        self.assertEqual(token.tag, "with")

        tag = "{{#> compose_banner }}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "handlebars_partial_block")
        self.assertEqual(token.tag, "compose_banner")

        tag = "{% if foo %}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "django_start")
        self.assertEqual(token.tag, "if")

        tag = "{% endif %}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "django_end")
        self.assertEqual(token.tag, "if")

        tag = "{% if foo -%}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "jinja2_whitespace_stripped_start")
        self.assertEqual(token.tag, "if")

        tag = "{%- endif %}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "jinja2_whitespace_stripped_end")
        self.assertEqual(token.tag, "if")

        tag = "{%- if foo -%}bla"
        token = tokenize(tag)[0]
        self.assertEqual(token.kind, "jinja2_whitespace_stripped_type2_start")
        self.assertEqual(token.tag, "if")