import math

import pytest

from jinja2.exceptions import UndefinedError
from jinja2.nativetypes import NativeEnvironment
from jinja2.nativetypes import NativeTemplate
from jinja2.runtime import Undefined


@pytest.fixture
def env():
    return NativeEnvironment()


def test_is_defined_native_return(env):
    t = env.from_string("{{ missing is defined }}")
    assert not t.render()


def test_undefined_native_return(env):
    t = env.from_string("{{ missing }}")
    assert isinstance(t.render(), Undefined)


def test_adding_undefined_native_return(env):
    t = env.from_string("{{ 3 + missing }}")

    with pytest.raises(UndefinedError):
        t.render()


def test_cast_int(env):
    t = env.from_string("{{ value|int }}")
    result = t.render(value="3")
    assert isinstance(result, int)
    assert result == 3


def test_list_add(env):
    t = env.from_string("{{ a + b }}")
    result = t.render(a=["a", "b"], b=["c", "d"])
    assert isinstance(result, list)
    assert result == ["a", "b", "c", "d"]


def test_multi_expression_add(env):
    t = env.from_string("{{ a }} + {{ b }}")
    result = t.render(a=["a", "b"], b=["c", "d"])
    assert not isinstance(result, list)
    assert result == "['a', 'b'] + ['c', 'd']"


def test_loops(env):
    t = env.from_string("{% for x in value %}{{ x }}{% endfor %}")
    result = t.render(value=["a", "b", "c", "d"])
    assert isinstance(result, str)
    assert result == "abcd"


def test_loops_with_ints(env):
    t = env.from_string("{% for x in value %}{{ x }}{% endfor %}")
    result = t.render(value=[1, 2, 3, 4])
    assert isinstance(result, int)
    assert result == 1234


def test_loop_look_alike(env):
    t = env.from_string("{% for x in value %}{{ x }}{% endfor %}")
    result = t.render(value=[1])
    assert isinstance(result, int)
    assert result == 1


@pytest.mark.parametrize(
    ("source", "expect"),
    (
        ("{{ value }}", True),
        ("{{ value }}", False),
        ("{{ 1 == 1 }}", True),
        ("{{ 2 + 2 == 5 }}", False),
        ("{{ None is none }}", True),
        ("{{ '' == None }}", False),
    ),
)
def test_booleans(env, source, expect):
    t = env.from_string(source)
    result = t.render(value=expect)
    assert isinstance(result, bool)
    assert result is expect


def test_variable_dunder(env):
    t = env.from_string("{{ x.__class__ }}")
    result = t.render(x=True)
    assert isinstance(result, type)


def test_constant_dunder(env):
    t = env.from_string("{{ true.__class__ }}")
    result = t.render()
    assert isinstance(result, type)


def test_constant_dunder_to_string(env):
    t = env.from_string("{{ true.__class__|string }}")
    result = t.render()
    assert not isinstance(result, type)
    assert result in {"<type 'bool'>", "<class 'bool'>"}


def test_string_literal_var(env):
    t = env.from_string("[{{ 'all' }}]")
    result = t.render()
    assert isinstance(result, str)
    assert result == "[all]"


def test_string_top_level(env):
    t = env.from_string("'Jinja'")
    result = t.render()
    assert result == "Jinja"


def test_tuple_of_variable_strings(env):
    t = env.from_string("'{{ a }}', 'data', '{{ b }}', b'{{ c }}'")
    result = t.render(a=1, b=2, c="bytes")
    assert isinstance(result, tuple)
    assert result == ("1", "data", "2", b"bytes")


def test_concat_strings_with_quotes(env):
    t = env.from_string("--host='{{ host }}' --user \"{{ user }}\"")
    result = t.render(host="localhost", user="Jinja")
    assert result == "--host='localhost' --user \"Jinja\""


def test_no_intermediate_eval(env):
    t = env.from_string("0.000{{ a }}")
    result = t.render(a=7)
    assert isinstance(result, float)
    # If intermediate eval happened, 0.000 would render 0.0, then 7
    # would be appended, resulting in 0.07.
    assert math.isclose(result, 0.0007)


def test_spontaneous_env():
    t = NativeTemplate("{{ true }}")
    assert isinstance(t.environment, NativeEnvironment)