import asyncio

import pytest

from sanic.blueprints import Blueprint
from sanic.exceptions import HeaderExpectationFailed
from sanic.request import StreamBuffer
from sanic.response import json, stream, text
from sanic.server import HttpProtocol
from sanic.views import CompositionView, HTTPMethodView
from sanic.views import stream as stream_decorator


data = "abc" * 1_000_000


def test_request_stream_method_view(app):
    """for self.is_request_stream = True"""

    class SimpleView(HTTPMethodView):
        def get(self, request):
            assert request.stream is None
            return text("OK")

        @stream_decorator
        async def post(self, request):
            assert isinstance(request.stream, StreamBuffer)
            result = ""
            while True:
                body = await request.stream.read()
                if body is None:
                    break
                result += body.decode("utf-8")
            return text(result)

    app.add_route(SimpleView.as_view(), "/method_view")

    assert app.is_request_stream is True

    request, response = app.test_client.get("/method_view")
    assert response.status == 200
    assert response.text == "OK"

    request, response = app.test_client.post("/method_view", data=data)
    assert response.status == 200
    assert response.text == data


@pytest.mark.parametrize(
    "headers, expect_raise_exception",
    [
        ({"EXPECT": "100-continue"}, False),
        ({"EXPECT": "100-continue-extra"}, True),
    ],
)
def test_request_stream_100_continue(app, headers, expect_raise_exception):
    class SimpleView(HTTPMethodView):
        @stream_decorator
        async def post(self, request):
            assert isinstance(request.stream, StreamBuffer)
            result = ""
            while True:
                body = await request.stream.read()
                if body is None:
                    break
                result += body.decode("utf-8")
            return text(result)

    app.add_route(SimpleView.as_view(), "/method_view")

    assert app.is_request_stream is True

    if not expect_raise_exception:
        request, response = app.test_client.post(
            "/method_view", data=data, headers={"EXPECT": "100-continue"}
        )
        assert response.status == 200
        assert response.text == data
    else:
        with pytest.raises(ValueError) as e:
            app.test_client.post(
                "/method_view",
                data=data,
                headers={"EXPECT": "100-continue-extra"},
            )
            assert "Unknown Expect: 100-continue-extra" in str(e)


def test_request_stream_app(app):
    """for self.is_request_stream = True and decorators"""

    @app.get("/get")
    async def get(request):
        assert request.stream is None
        return text("GET")

    @app.head("/head")
    async def head(request):
        assert request.stream is None
        return text("HEAD")

    @app.delete("/delete")
    async def delete(request):
        assert request.stream is None
        return text("DELETE")

    @app.options("/options")
    async def options(request):
        assert request.stream is None
        return text("OPTIONS")

    @app.post("/_post/<id>")
    async def _post(request, id):
        assert request.stream is None
        return text("_POST")

    @app.post("/post/<id>", stream=True)
    async def post(request, id):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @app.put("/_put")
    async def _put(request):
        assert request.stream is None
        return text("_PUT")

    @app.put("/put", stream=True)
    async def put(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @app.patch("/_patch")
    async def _patch(request):
        assert request.stream is None
        return text("_PATCH")

    @app.patch("/patch", stream=True)
    async def patch(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    assert app.is_request_stream is True

    request, response = app.test_client.get("/get")
    assert response.status == 200
    assert response.text == "GET"

    request, response = app.test_client.head("/head")
    assert response.status == 200
    assert response.text == ""

    request, response = app.test_client.delete("/delete")
    assert response.status == 200
    assert response.text == "DELETE"

    request, response = app.test_client.options("/options")
    assert response.status == 200
    assert response.text == "OPTIONS"

    request, response = app.test_client.post("/_post/1", data=data)
    assert response.status == 200
    assert response.text == "_POST"

    request, response = app.test_client.post("/post/1", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.put("/_put", data=data)
    assert response.status == 200
    assert response.text == "_PUT"

    request, response = app.test_client.put("/put", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.patch("/_patch", data=data)
    assert response.status == 200
    assert response.text == "_PATCH"

    request, response = app.test_client.patch("/patch", data=data)
    assert response.status == 200
    assert response.text == data


@pytest.mark.asyncio
async def test_request_stream_app_asgi(app):
    """for self.is_request_stream = True and decorators"""

    @app.get("/get")
    async def get(request):
        assert request.stream is None
        return text("GET")

    @app.head("/head")
    async def head(request):
        assert request.stream is None
        return text("HEAD")

    @app.delete("/delete")
    async def delete(request):
        assert request.stream is None
        return text("DELETE")

    @app.options("/options")
    async def options(request):
        assert request.stream is None
        return text("OPTIONS")

    @app.post("/_post/<id>")
    async def _post(request, id):
        assert request.stream is None
        return text("_POST")

    @app.post("/post/<id>", stream=True)
    async def post(request, id):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @app.put("/_put")
    async def _put(request):
        assert request.stream is None
        return text("_PUT")

    @app.put("/put", stream=True)
    async def put(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @app.patch("/_patch")
    async def _patch(request):
        assert request.stream is None
        return text("_PATCH")

    @app.patch("/patch", stream=True)
    async def patch(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    assert app.is_request_stream is True

    request, response = await app.asgi_client.get("/get")
    assert response.status == 200
    assert response.text == "GET"

    request, response = await app.asgi_client.head("/head")
    assert response.status == 200
    assert response.text == ""

    request, response = await app.asgi_client.delete("/delete")
    assert response.status == 200
    assert response.text == "DELETE"

    request, response = await app.asgi_client.options("/options")
    assert response.status == 200
    assert response.text == "OPTIONS"

    request, response = await app.asgi_client.post("/_post/1", data=data)
    assert response.status == 200
    assert response.text == "_POST"

    request, response = await app.asgi_client.post("/post/1", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = await app.asgi_client.put("/_put", data=data)
    assert response.status == 200
    assert response.text == "_PUT"

    request, response = await app.asgi_client.put("/put", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = await app.asgi_client.patch("/_patch", data=data)
    assert response.status == 200
    assert response.text == "_PATCH"

    request, response = await app.asgi_client.patch("/patch", data=data)
    assert response.status == 200
    assert response.text == data


def test_request_stream_handle_exception(app):
    """for handling exceptions properly"""

    @app.post("/post/<id>", stream=True)
    async def post(request, id):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    # 404
    request, response = app.test_client.post("/in_valid_post", data=data)
    assert response.status == 404
    assert "Requested URL /in_valid_post not found" in response.text

    # 405
    request, response = app.test_client.get("/post/random_id")
    assert response.status == 405
    assert "Method GET not allowed for URL /post/random_id" in response.text


@pytest.mark.asyncio
async def test_request_stream_unread(app):
    """ensure no error is raised when leaving unread bytes in byte-buffer"""

    err = None
    protocol = HttpProtocol(loop=asyncio.get_event_loop(), app=app)
    try:
        protocol.request = None
        protocol._body_chunks.append("this is a test")
        await protocol.stream_append()
    except AttributeError as e:
        err = e

    assert err is None and not protocol._body_chunks


def test_request_stream_blueprint(app):
    """for self.is_request_stream = True"""
    bp = Blueprint("test_blueprint_request_stream_blueprint")

    @app.get("/get")
    async def get(request):
        assert request.stream is None
        return text("GET")

    @bp.head("/head")
    async def head(request):
        assert request.stream is None
        return text("HEAD")

    @bp.delete("/delete")
    async def delete(request):
        assert request.stream is None
        return text("DELETE")

    @bp.options("/options")
    async def options(request):
        assert request.stream is None
        return text("OPTIONS")

    @bp.post("/_post/<id>")
    async def _post(request, id):
        assert request.stream is None
        return text("_POST")

    @bp.post("/post/<id>", stream=True)
    async def post(request, id):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @bp.put("/_put")
    async def _put(request):
        assert request.stream is None
        return text("_PUT")

    @bp.put("/put", stream=True)
    async def put(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @bp.patch("/_patch")
    async def _patch(request):
        assert request.stream is None
        return text("_PATCH")

    @bp.patch("/patch", stream=True)
    async def patch(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    async def post_add_route(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    bp.add_route(
        post_add_route, "/post/add_route", methods=["POST"], stream=True
    )
    app.blueprint(bp)

    assert app.is_request_stream is True

    request, response = app.test_client.get("/get")
    assert response.status == 200
    assert response.text == "GET"

    request, response = app.test_client.head("/head")
    assert response.status == 200
    assert response.text == ""

    request, response = app.test_client.delete("/delete")
    assert response.status == 200
    assert response.text == "DELETE"

    request, response = app.test_client.options("/options")
    assert response.status == 200
    assert response.text == "OPTIONS"

    request, response = app.test_client.post("/_post/1", data=data)
    assert response.status == 200
    assert response.text == "_POST"

    request, response = app.test_client.post("/post/1", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.put("/_put", data=data)
    assert response.status == 200
    assert response.text == "_PUT"

    request, response = app.test_client.put("/put", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.patch("/_patch", data=data)
    assert response.status == 200
    assert response.text == "_PATCH"

    request, response = app.test_client.patch("/patch", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.post("/post/add_route", data=data)
    assert response.status == 200
    assert response.text == data


def test_request_stream_composition_view(app):
    """for self.is_request_stream = True"""

    def get_handler(request):
        assert request.stream is None
        return text("OK")

    async def post_handler(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    view = CompositionView()
    view.add(["GET"], get_handler)
    view.add(["POST"], post_handler, stream=True)
    app.add_route(view, "/composition_view")

    assert app.is_request_stream is True

    request, response = app.test_client.get("/composition_view")
    assert response.status == 200
    assert response.text == "OK"

    request, response = app.test_client.post("/composition_view", data=data)
    assert response.status == 200
    assert response.text == data


def test_request_stream(app):
    """test for complex application"""
    bp = Blueprint("test_blueprint_request_stream")

    class SimpleView(HTTPMethodView):
        def get(self, request):
            assert request.stream is None
            return text("OK")

        @stream_decorator
        async def post(self, request):
            assert isinstance(request.stream, StreamBuffer)
            result = ""
            while True:
                body = await request.stream.read()
                if body is None:
                    break
                result += body.decode("utf-8")
            return text(result)

    @app.post("/stream", stream=True)
    async def handler(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @app.get("/get")
    async def get(request):
        assert request.stream is None
        return text("OK")

    @bp.post("/bp_stream", stream=True)
    async def bp_stream(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    @bp.get("/bp_get")
    async def bp_get(request):
        assert request.stream is None
        return text("OK")

    def get_handler(request):
        assert request.stream is None
        return text("OK")

    async def post_handler(request):
        assert isinstance(request.stream, StreamBuffer)
        result = ""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body.decode("utf-8")
        return text(result)

    app.add_route(SimpleView.as_view(), "/method_view")

    view = CompositionView()
    view.add(["GET"], get_handler)
    view.add(["POST"], post_handler, stream=True)

    app.blueprint(bp)

    app.add_route(view, "/composition_view")

    assert app.is_request_stream is True

    request, response = app.test_client.get("/method_view")
    assert response.status == 200
    assert response.text == "OK"

    request, response = app.test_client.post("/method_view", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.get("/composition_view")
    assert response.status == 200
    assert response.text == "OK"

    request, response = app.test_client.post("/composition_view", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.get("/get")
    assert response.status == 200
    assert response.text == "OK"

    request, response = app.test_client.post("/stream", data=data)
    assert response.status == 200
    assert response.text == data

    request, response = app.test_client.get("/bp_get")
    assert response.status == 200
    assert response.text == "OK"

    request, response = app.test_client.post("/bp_stream", data=data)
    assert response.status == 200
    assert response.text == data


def test_streaming_new_api(app):
    @app.post("/non-stream")
    async def handler(request):
        assert request.body == b"x"
        await request.receive_body()  # This should do nothing
        assert request.body == b"x"
        return text("OK")

    @app.post("/1", stream=True)
    async def handler(request):
        assert request.stream
        assert not request.body
        await request.receive_body()
        return text(request.body.decode().upper())

    @app.post("/2", stream=True)
    async def handler(request):
        ret = []
        async for data in request.stream:
            # We should have no b"" or None, just proper chunks
            assert data
            assert isinstance(data, bytes)
            ret.append(data.decode("ASCII"))
        return json(ret)

    request, response = app.test_client.post("/non-stream", data="x")
    assert response.status == 200

    request, response = app.test_client.post("/1", data="TEST data")
    assert request.body == b"TEST data"
    assert response.status == 200
    assert response.text == "TEST DATA"

    request, response = app.test_client.post("/2", data=data)
    assert response.status == 200
    res = response.json
    assert isinstance(res, list)
    assert len(res) > 1
    assert "".join(res) == data