from __future__ import annotations

import os
from pathlib import Path
from unittest import mock

import jinja2
import pytest

from starlette.applications import Starlette
from starlette.background import BackgroundTask
from starlette.middleware import Middleware
from starlette.middleware.base import BaseHTTPMiddleware, RequestResponseEndpoint
from starlette.requests import Request
from starlette.responses import Response
from starlette.routing import Route
from starlette.templating import Jinja2Templates
from tests.types import TestClientFactory


def test_templates(tmpdir: Path, test_client_factory: TestClientFactory) -> None:
    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("<html>Hello, <a href='{{ url_for('homepage') }}'>world</a></html>")

    async def homepage(request: Request) -> Response:
        return templates.TemplateResponse(request, "index.html")

    app = Starlette(debug=True, routes=[Route("/", endpoint=homepage)])
    templates = Jinja2Templates(directory=str(tmpdir))

    client = test_client_factory(app)
    response = client.get("/")
    assert response.text == "<html>Hello, <a href='http://testserver/'>world</a></html>"
    assert response.template.name == "index.html"  # type: ignore
    assert set(response.context.keys()) == {"request"}  # type: ignore


def test_calls_context_processors(tmp_path: Path, test_client_factory: TestClientFactory) -> None:
    path = tmp_path / "index.html"
    path.write_text("<html>Hello {{ username }}</html>")

    async def homepage(request: Request) -> Response:
        return templates.TemplateResponse(request, "index.html")

    def hello_world_processor(request: Request) -> dict[str, str]:
        return {"username": "World"}

    app = Starlette(
        debug=True,
        routes=[Route("/", endpoint=homepage)],
    )
    templates = Jinja2Templates(
        directory=tmp_path,
        context_processors=[
            hello_world_processor,
        ],
    )

    client = test_client_factory(app)
    response = client.get("/")
    assert response.text == "<html>Hello World</html>"
    assert response.template.name == "index.html"  # type: ignore
    assert set(response.context.keys()) == {"request", "username"}  # type: ignore


def test_template_with_middleware(tmpdir: Path, test_client_factory: TestClientFactory) -> None:
    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("<html>Hello, <a href='{{ url_for('homepage') }}'>world</a></html>")

    async def homepage(request: Request) -> Response:
        return templates.TemplateResponse(request, "index.html")

    class CustomMiddleware(BaseHTTPMiddleware):
        async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -> Response:
            return await call_next(request)

    app = Starlette(
        debug=True,
        routes=[Route("/", endpoint=homepage)],
        middleware=[Middleware(CustomMiddleware)],
    )
    templates = Jinja2Templates(directory=str(tmpdir))

    client = test_client_factory(app)
    response = client.get("/")
    assert response.text == "<html>Hello, <a href='http://testserver/'>world</a></html>"
    assert response.template.name == "index.html"  # type: ignore
    assert set(response.context.keys()) == {"request"}  # type: ignore


def test_templates_with_directories(tmp_path: Path, test_client_factory: TestClientFactory) -> None:
    dir_a = tmp_path.resolve() / "a"
    dir_a.mkdir()
    template_a = dir_a / "template_a.html"
    template_a.write_text("<html><a href='{{ url_for('page_a') }}'></a> a</html>")

    async def page_a(request: Request) -> Response:
        return templates.TemplateResponse(request, "template_a.html")

    dir_b = tmp_path.resolve() / "b"
    dir_b.mkdir()
    template_b = dir_b / "template_b.html"
    template_b.write_text("<html><a href='{{ url_for('page_b') }}'></a> b</html>")

    async def page_b(request: Request) -> Response:
        return templates.TemplateResponse(request, "template_b.html")

    app = Starlette(
        debug=True,
        routes=[Route("/a", endpoint=page_a), Route("/b", endpoint=page_b)],
    )
    templates = Jinja2Templates(directory=[dir_a, dir_b])

    client = test_client_factory(app)
    response = client.get("/a")
    assert response.text == "<html><a href='http://testserver/a'></a> a</html>"
    assert response.template.name == "template_a.html"  # type: ignore
    assert set(response.context.keys()) == {"request"}  # type: ignore

    response = client.get("/b")
    assert response.text == "<html><a href='http://testserver/b'></a> b</html>"
    assert response.template.name == "template_b.html"  # type: ignore
    assert set(response.context.keys()) == {"request"}  # type: ignore


def test_templates_require_directory_or_environment() -> None:
    with pytest.raises(AssertionError, match="either 'directory' or 'env' arguments must be passed"):
        Jinja2Templates()  # type: ignore[call-overload]


def test_templates_require_directory_or_enviroment_not_both() -> None:
    with pytest.raises(AssertionError, match="either 'directory' or 'env' arguments must be passed"):
        Jinja2Templates(directory="dir", env=jinja2.Environment())


def test_templates_with_directory(tmpdir: Path) -> None:
    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("Hello")

    templates = Jinja2Templates(directory=str(tmpdir))
    template = templates.get_template("index.html")
    assert template.render({}) == "Hello"


def test_templates_with_environment(tmpdir: Path, test_client_factory: TestClientFactory) -> None:
    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("<html>Hello, <a href='{{ url_for('homepage') }}'>world</a></html>")

    async def homepage(request: Request) -> Response:
        return templates.TemplateResponse(request, "index.html")

    env = jinja2.Environment(loader=jinja2.FileSystemLoader(str(tmpdir)))
    app = Starlette(
        debug=True,
        routes=[Route("/", endpoint=homepage)],
    )
    templates = Jinja2Templates(env=env)
    client = test_client_factory(app)
    response = client.get("/")
    assert response.text == "<html>Hello, <a href='http://testserver/'>world</a></html>"
    assert response.template.name == "index.html"  # type: ignore
    assert set(response.context.keys()) == {"request"}  # type: ignore


def test_templates_with_environment_options_emit_warning(tmpdir: Path) -> None:
    with pytest.warns(DeprecationWarning):
        Jinja2Templates(str(tmpdir), autoescape=True)


def test_templates_with_kwargs_only(tmpdir: Path, test_client_factory: TestClientFactory) -> None:
    # MAINTAINERS: remove after 1.0
    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("value: {{ a }}")
    templates = Jinja2Templates(directory=str(tmpdir))

    spy = mock.MagicMock()

    def page(request: Request) -> Response:
        return templates.TemplateResponse(
            request=request,
            name="index.html",
            context={"a": "b"},
            status_code=201,
            headers={"x-key": "value"},
            media_type="text/plain",
            background=BackgroundTask(func=spy),
        )

    app = Starlette(routes=[Route("/", page)])
    client = test_client_factory(app)
    response = client.get("/")

    assert response.text == "value: b"  # context was rendered
    assert response.status_code == 201
    assert response.headers["x-key"] == "value"
    assert response.headers["content-type"] == "text/plain; charset=utf-8"
    spy.assert_called()


def test_templates_with_kwargs_only_requires_request_in_context(tmpdir: Path) -> None:
    # MAINTAINERS: remove after 1.0

    templates = Jinja2Templates(directory=str(tmpdir))
    with pytest.warns(
        DeprecationWarning,
        match="requires the `request` argument",
    ):
        with pytest.raises(ValueError):
            templates.TemplateResponse(name="index.html", context={"a": "b"})


def test_templates_with_kwargs_only_warns_when_no_request_keyword(
    tmpdir: Path, test_client_factory: TestClientFactory
) -> None:
    # MAINTAINERS: remove after 1.0

    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("Hello")

    templates = Jinja2Templates(directory=str(tmpdir))

    def page(request: Request) -> Response:
        return templates.TemplateResponse(name="index.html", context={"request": request})

    app = Starlette(routes=[Route("/", page)])
    client = test_client_factory(app)

    with pytest.warns(
        DeprecationWarning,
        match="requires the `request` argument",
    ):
        client.get("/")


def test_templates_with_requires_request_in_context(tmpdir: Path) -> None:
    # MAINTAINERS: remove after 1.0
    templates = Jinja2Templates(directory=str(tmpdir))
    with pytest.warns(DeprecationWarning):
        with pytest.raises(ValueError):
            templates.TemplateResponse("index.html", context={})


def test_templates_warns_when_first_argument_isnot_request(
    tmpdir: Path, test_client_factory: TestClientFactory
) -> None:
    # MAINTAINERS: remove after 1.0
    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("value: {{ a }}")
    templates = Jinja2Templates(directory=str(tmpdir))

    spy = mock.MagicMock()

    def page(request: Request) -> Response:
        return templates.TemplateResponse(
            "index.html",
            {"a": "b", "request": request},
            status_code=201,
            headers={"x-key": "value"},
            media_type="text/plain",
            background=BackgroundTask(func=spy),
        )

    app = Starlette(routes=[Route("/", page)])
    client = test_client_factory(app)
    with pytest.warns(DeprecationWarning):
        response = client.get("/")

    assert response.text == "value: b"  # context was rendered
    assert response.status_code == 201
    assert response.headers["x-key"] == "value"
    assert response.headers["content-type"] == "text/plain; charset=utf-8"
    spy.assert_called()


def test_templates_when_first_argument_is_request(tmpdir: Path, test_client_factory: TestClientFactory) -> None:
    # MAINTAINERS: remove after 1.0
    path = os.path.join(tmpdir, "index.html")
    with open(path, "w") as file:
        file.write("value: {{ a }}")
    templates = Jinja2Templates(directory=str(tmpdir))

    spy = mock.MagicMock()

    def page(request: Request) -> Response:
        return templates.TemplateResponse(
            request,
            "index.html",
            {"a": "b"},
            status_code=201,
            headers={"x-key": "value"},
            media_type="text/plain",
            background=BackgroundTask(func=spy),
        )

    app = Starlette(routes=[Route("/", page)])
    client = test_client_factory(app)
    response = client.get("/")

    assert response.text == "value: b"  # context was rendered
    assert response.status_code == 201
    assert response.headers["x-key"] == "value"
    assert response.headers["content-type"] == "text/plain; charset=utf-8"
    spy.assert_called()
