from werkzeug.datastructures import Headers
from werkzeug.sansio.multipart import Data
from werkzeug.sansio.multipart import Epilogue
from werkzeug.sansio.multipart import Field
from werkzeug.sansio.multipart import File
from werkzeug.sansio.multipart import MultipartDecoder
from werkzeug.sansio.multipart import MultipartEncoder
from werkzeug.sansio.multipart import NeedData
from werkzeug.sansio.multipart import Preamble


def test_decoder_simple() -> None:
    boundary = b"---------------------------9704338192090380615194531385$"
    decoder = MultipartDecoder(boundary)
    data = """
-----------------------------9704338192090380615194531385$
Content-Disposition: form-data; name="fname"

ß∑œß∂ƒå∂
-----------------------------9704338192090380615194531385$
Content-Disposition: form-data; name="lname"; filename="bob"

asdasd
-----------------------------9704338192090380615194531385$--
    """.replace(
        "\n", "\r\n"
    ).encode(
        "utf-8"
    )
    decoder.receive_data(data)
    decoder.receive_data(None)
    events = [decoder.next_event()]
    while not isinstance(events[-1], Epilogue) and len(events) < 6:
        events.append(decoder.next_event())
    assert events == [
        Preamble(data=b""),
        Field(
            name="fname",
            headers=Headers([("Content-Disposition", 'form-data; name="fname"')]),
        ),
        Data(data="ß∑œß∂ƒå∂".encode(), more_data=False),
        File(
            name="lname",
            filename="bob",
            headers=Headers(
                [("Content-Disposition", 'form-data; name="lname"; filename="bob"')]
            ),
        ),
        Data(data=b"asdasd", more_data=False),
        Epilogue(data=b"    "),
    ]
    encoder = MultipartEncoder(boundary)
    result = b""
    for event in events:
        result += encoder.send_event(event)
    assert data == result


def test_chunked_boundaries() -> None:
    boundary = b"--boundary"
    decoder = MultipartDecoder(boundary)
    decoder.receive_data(b"--")
    assert isinstance(decoder.next_event(), NeedData)
    decoder.receive_data(b"--boundary\r\n")
    assert isinstance(decoder.next_event(), Preamble)
    decoder.receive_data(b"Content-Disposition: form-data;")
    assert isinstance(decoder.next_event(), NeedData)
    decoder.receive_data(b'name="fname"\r\n\r\n')
    assert isinstance(decoder.next_event(), Field)
    decoder.receive_data(b"longer than the boundary")
    assert isinstance(decoder.next_event(), Data)
    decoder.receive_data(b"also longer, but includes a linebreak\r\n--")
    assert isinstance(decoder.next_event(), Data)
    assert isinstance(decoder.next_event(), NeedData)
    decoder.receive_data(b"--boundary--\r\n")
    event = decoder.next_event()
    assert isinstance(event, Data)
    assert not event.more_data
    decoder.receive_data(None)
    assert isinstance(decoder.next_event(), Epilogue)