import os
import jinja2
from pathlib import Path
from bopytex.worker.generate import tpl2tex, generate
import pytest


def test_tpl2tex():
    tpl = "Plop {{a}}"
    jinja2_tpl = jinja2.Template(tpl)
    fed = tpl2tex(jinja2_tpl, metas={"a": 1})
    assert fed == "Plop 1"


@pytest.fixture
def template_path(tmp_path):
    template = tmp_path / "template.j2"
    with open(template, "w") as tpl:
        tpl.write("Plop {{ a }}")
    return template


@pytest.fixture
def jinja2_env(tmp_path):
    templateEnv = jinja2.Environment(loader=jinja2.FileSystemLoader(tmp_path))
    return templateEnv


def test_generate(template_path, jinja2_env):
    tmp_path = template_path.parent
    os.chdir(tmp_path)

    assert template_path.exists
    template = str(template_path.name)
    output = "output"

    result = next(generate(
        args={"a": 2, "jinja2": {"environment": jinja2_env}},
        deps=[template],
        output=output,
    ))
    assert result == "GENERATE - template.j2 to output"
    with open(output, "r") as out:
        lines = out.readlines()
        assert lines == ["Plop 2"]