import asyncio

import pytest

from sanic import Sanic
from sanic.blueprints import Blueprint
from sanic.response import json, text
from sanic.views import HTTPMethodView
from sanic.views import stream as stream_decorator


data = "abc" * 1_000_000


def test_request_stream_method_view(app):
    class SimpleView(HTTPMethodView):
        def get(self, request):
            return text("OK")

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

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

    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),
        # The below test SHOULD work, and it does produce a 417
        # However, httpx now intercepts this and raises an exception,
        # so we will need a new method for testing this
        # ({"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):
            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")

    if not expect_raise_exception:
        request, response = app.test_client.post(
            "/method_view", data=data, headers=headers
        )
        assert response.status == 200
        assert response.text == data
    else:
        request, response = app.test_client.post(
            "/method_view", data=data, headers=headers
        )
        assert response.status == 417


def test_request_stream_app(app):
    @app.get("/get")
    async def get(request):
        return text("GET")

    @app.head("/head")
    async def head(request):
        return text("HEAD")

    @app.delete("/delete")
    async def delete(request):
        return text("DELETE")

    @app.options("/options")
    async def options(request):
        return text("OPTIONS")

    @app.post("/_post/<id>")
    async def _post(request, id):
        return text("_POST")

    @app.post("/post/<id>", stream=True)
    async def post(request, id):
        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):
        return text("_PUT")

    @app.put("/put", stream=True)
    async def put(request):
        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):
        return text("_PATCH")

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

    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):
    @app.get("/get")
    async def get(request):
        return text("GET")

    @app.head("/head")
    async def head(request):
        return text("HEAD")

    @app.delete("/delete")
    async def delete(request):
        return text("DELETE")

    @app.options("/options")
    async def options(request):
        return text("OPTIONS")

    @app.post("/_post/<id>")
    async def _post(request, id):
        return text("_POST")

    @app.post("/post/<id>", stream=True)
    async def post(request, id):
        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):
        return text("_PUT")

    @app.put("/put", stream=True)
    async def put(request):
        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):
        return text("_PATCH")

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

    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):
        result = b""
        while True:
            body = await request.stream.read()
            if body is None:
                break
            result += body
        return text(result.decode())

    # 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


def test_request_stream_blueprint(app):
    bp = Blueprint("test_blueprint_request_stream_blueprint")

    @app.get("/get")
    async def get(request):
        return text("GET")

    @bp.head("/head")
    async def head(request):
        return text("HEAD")

    @bp.delete("/delete")
    async def delete(request):
        return text("DELETE")

    @bp.options("/options")
    async def options(request):
        return text("OPTIONS")

    @bp.post("/_post/<id>")
    async def _post(request, id):
        return text("_POST")

    @bp.post("/post/<id>", stream=True)
    async def post(request, id):
        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):
        return text("_PUT")

    @bp.put("/put", stream=True)
    async def put(request):
        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):
        return text("_PATCH")

    @bp.patch("/patch", stream=True)
    async def patch(request):
        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):
        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)

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

    class SimpleView(HTTPMethodView):
        def get(self, request):
            return text("OK")

        @stream_decorator
        async def post(self, request):
            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):
        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):
        return text("OK")

    @bp.post("/bp_stream", stream=True)
    async def bp_stream(request):
        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):
        return text("OK")

    def get_handler(request):
        return text("OK")

    async def post_handler(request):
        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")

    app.blueprint(bp)

    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("/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 handler1(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 handler2(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 "".join(res) == data


def test_streaming_echo():
    """2-way streaming chat between server and client."""
    app = Sanic(name="Test")

    @app.post("/echo", stream=True)
    async def handler(request):
        res = await request.respond(content_type="text/plain; charset=utf-8")
        # Send headers
        await res.send(end_stream=False)
        # Echo back data (case swapped)
        async for data in request.stream:
            await res.send(data.swapcase())
        # Add EOF marker after successful operation
        await res.send(b"-", end_stream=True)

    @app.listener("after_server_start")
    async def client_task(app, loop):
        try:
            reader, writer = await asyncio.open_connection("localhost", 8000)
            await client(app, reader, writer)
        finally:
            writer.close()
            app.stop()

    async def client(app, reader, writer):
        # Unfortunately httpx does not support 2-way streaming, so do it by hand.
        host = f"host: localhost:8000\r\n".encode()
        writer.write(
            b"POST /echo HTTP/1.1\r\n" + host + b"content-length: 2\r\n"
            b"content-type: text/plain; charset=utf-8\r\n"
            b"\r\n"
        )
        # Read response
        res = b""
        while not b"\r\n\r\n" in res:
            res += await reader.read(4096)
        assert res.startswith(b"HTTP/1.1 200 OK\r\n")
        assert res.endswith(b"\r\n\r\n")
        buffer = b""

        async def read_chunk():
            nonlocal buffer
            while not b"\r\n" in buffer:
                data = await reader.read(4096)
                assert data
                buffer += data
            size, buffer = buffer.split(b"\r\n", 1)
            size = int(size, 16)
            if size == 0:
                return None
            while len(buffer) < size + 2:
                data = await reader.read(4096)
                assert data
                buffer += data
            assert buffer[size : size + 2] == b"\r\n"
            ret, buffer = buffer[:size], buffer[size + 2 :]
            return ret

        # Chat with server
        writer.write(b"a")
        res = await read_chunk()
        assert res == b"A"

        writer.write(b"b")
        res = await read_chunk()
        assert res == b"B"

        res = await read_chunk()
        assert res == b"-"

        res = await read_chunk()
        assert res == None

    app.run(access_log=False, single_process=True)
