import os
import sys
from typing import List, Union

import pytest
from ellar.common import File, Form, ModuleRouter, UploadFile, serialize_object
from ellar.openapi import OpenAPIDocumentBuilder
from ellar.testing import Test
from starlette.formparsers import UploadFile as StarletteUploadFile

from .document_results import FORM_OPENAPI_DOC
from .sample import Filter

router = ModuleRouter("")


class ForceMultipartDict(dict):
    def __bool__(self):
        return True


# FORCE_MULTIPART is an empty dict that boolean-evaluates as `True`.
FORCE_MULTIPART = ForceMultipartDict()


@router.post
async def form_upload_single_case_1(test: UploadFile = File()):
    content = await test.read()
    return {
        "test": {
            "filename": test.filename,
            "content": content.decode(),
            "content_type": test.content_type,
        }
    }


@router.post("/mixed")
async def form_upload_single_case_2(
    test1: UploadFile = File(alias="test_alias"), test2: UploadFile = File()
):
    content1 = await test1.read()
    content2 = await test2.read()

    return {
        "test1": {
            "filename": test1.filename,
            "content": content1.decode(),
            "content_type": test1.content_type,
        },
        "test2": {
            "filename": test2.filename,
            "content": content2.decode(),
            "content_type": test2.content_type,
        },
    }


@router.post("/multiple")
async def form_upload_multiple_case_1(test1: List[Union[UploadFile, str]] = File()):
    results = []
    for item in test1:
        if not isinstance(item, StarletteUploadFile):
            results.append(item)
            continue

        content = await item.read()
        results.append(
            {
                "filename": item.filename,
                "content": content.decode(),
                "content_type": item.content_type,
            }
        )
    return {"test1": results}


@router.post("/mixed-optional")
async def form_upload_multiple_case_2(
    file: UploadFile = File(None),
    field: str = Form("", alias="field0"),
    field_2: str = Form(None, alias="field1"),
):
    _file = None
    if file:
        content = await file.read()
        _file = {
            "filename": file.filename,
            "content": content.decode(),
            "content_type": file.content_type,
        }
    return {
        "file": _file,
        "field0": field,
        "field1": field_2,
    }


@router.post("/form-with-schema-spreading")
def form_params_schema_spreading(
    file: File[UploadFile, File.P(alias="momentOfTruth")],
    filters: Filter = Form(..., alias="will_not_work_for_schema_with_many_field"),
):
    return dict(filters.dict(), file_name=file.filename)


tm = Test.create_test_module(routers=(router,))


def test_open_api_schema_generation():
    document = serialize_object(
        OpenAPIDocumentBuilder().build_document(tm.create_application())
    )
    assert document == FORM_OPENAPI_DOC


@pytest.mark.skipif(sys.version_info < (3, 7), reason="requires python >= 3.7")
def test_multipart_request_files(tmpdir):
    path = os.path.join(tmpdir, "test.txt")
    with open(path, "wb") as file:
        file.write(b"<file content>")

    client = tm.get_test_client()
    with open(path, "rb") as f:
        response = client.post("/", files={"test": f})
        assert response.json() == {
            "test": {
                "filename": "test.txt",
                "content": "<file content>",
                "content_type": "text/plain",
            }
        }


def test_file_with_form_schema_combines_all_to_one_schema(tmpdir):
    path = os.path.join(tmpdir, "test.txt")
    with open(path, "wb") as file:
        file.write(b"<file content>")

    client = tm.get_test_client()
    with open(path, "rb") as f:
        response = client.post(
            "/form-with-schema-spreading",
            data={"from": "1", "to": "2", "range": "50"},
            files={"momentOfTruth": ("test.txt", f, "text/plain")},
        )
        assert response.json() == {
            "file_name": "test.txt",
            "from_datetime": "1970-01-01T00:00:01+00:00",
            "range": 50,
            "to_datetime": "1970-01-01T00:00:02+00:00",
        }


def test_multipart_request_files_with_content_type(tmpdir):
    path = os.path.join(tmpdir, "test.txt")
    with open(path, "wb") as file:
        file.write(b"<file content>")

    client = tm.get_test_client()
    with open(path, "rb") as f:
        response = client.post("/", files={"test": ("test.txt", f, "text/plain")})
        assert response.json() == {
            "test": {
                "filename": "test.txt",
                "content": "<file content>",
                "content_type": "text/plain",
            }
        }


@pytest.mark.skipif(sys.version_info < (3, 7), reason="requires python >= 3.7")
def test_multipart_request_multiple_files(tmpdir):
    path1 = os.path.join(tmpdir, "test1.txt")
    with open(path1, "wb") as file:
        file.write(b"<file1 content>")

    path2 = os.path.join(tmpdir, "test2.txt")
    with open(path2, "wb") as file:
        file.write(b"<file2 content>")

    client = tm.get_test_client()
    with open(path1, "rb") as f1, open(path2, "rb") as f2:
        response = client.post(
            "/mixed", files={"test_alias": f1, "test2": ("test2.txt", f2, "text/plain")}
        )
        assert response.json() == {
            "test1": {
                "filename": "test1.txt",
                "content": "<file1 content>",
                "content_type": "text/plain",
            },
            "test2": {
                "filename": "test2.txt",
                "content": "<file2 content>",
                "content_type": "text/plain",
            },
        }


@pytest.mark.skipif(sys.version_info < (3, 7), reason="requires python >= 3.7")
def test_multi_items(tmpdir):
    path1 = os.path.join(tmpdir, "test1.txt")
    with open(path1, "wb") as file:
        file.write(b"<file1 content>")

    path2 = os.path.join(tmpdir, "test2.txt")
    with open(path2, "wb") as file:
        file.write(b"<file2 content>")

    client = tm.get_test_client()
    with open(path1, "rb") as f1, open(path2, "rb") as f2:
        response = client.post(
            "/multiple",
            data={"test1": "abc"},
            files=[("test1", f1), ("test1", ("test2.txt", f2, "text/plain"))],
        )
        assert response.json() == {
            "test1": [
                "abc",
                {
                    "filename": "test1.txt",
                    "content": "<file1 content>",
                    "content_type": "text/plain",
                },
                {
                    "filename": "test2.txt",
                    "content": "<file2 content>",
                    "content_type": "text/plain",
                },
            ]
        }


def test_multipart_request_mixed_files_and_data(tmpdir):
    client = tm.get_test_client()
    response = client.post(
        "/mixed-optional",
        data=(
            # data
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c\r\n"
            b'Content-Disposition: form-data; name="field0"\r\n\r\n'
            b"value0\r\n"
            # file
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c\r\n"
            b'Content-Disposition: form-data; name="file"; filename="file.txt"\r\n'
            b"Content-Type: text/plain\r\n\r\n"
            b"<file content>\r\n"
            # data
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c\r\n"
            b'Content-Disposition: form-data; name="field1"\r\n\r\n'
            b"value1\r\n"
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c--\r\n"
        ),
        headers={
            "Content-Type": (
                "multipart/form-data; boundary=a7f7ac8d4e2e437c877bb7b8d7cc549c"
            )
        },
    )
    assert response.json() == {
        "file": {
            "filename": "file.txt",
            "content": "<file content>",
            "content_type": "text/plain",
        },
        "field0": "value0",
        "field1": "value1",
    }


def test_multipart_request_with_charset_for_filename(tmpdir):
    client = tm.get_test_client()
    response = client.post(
        "/mixed-optional",
        data=(
            # file
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c\r\n"
            b'Content-Disposition: form-data; name="file"; filename="\xe6\x96\x87\xe6\x9b\xb8.txt"\r\n'
            b"Content-Type: text/plain\r\n\r\n"
            b"<file content>\r\n"
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c--\r\n"
        ),
        headers={
            "Content-Type": (
                "multipart/form-data; charset=utf-8; "
                "boundary=a7f7ac8d4e2e437c877bb7b8d7cc549c"
            )
        },
    )
    assert response.json() == {
        "file": {
            "filename": "文書.txt",
            "content": "<file content>",
            "content_type": "text/plain",
        },
        "field0": "",
        "field1": None,
    }


def test_multipart_request_without_charset_for_filename(tmpdir):
    client = tm.get_test_client()
    response = client.post(
        "/mixed-optional",
        data=(
            # file
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c\r\n"
            b'Content-Disposition: form-data; name="file"; filename="\xe7\x94\xbb\xe5\x83\x8f.jpg"\r\n'
            b"Content-Type: image/jpeg\r\n\r\n"
            b"<file content>\r\n"
            b"--a7f7ac8d4e2e437c877bb7b8d7cc549c--\r\n"
        ),
        headers={
            "Content-Type": (
                "multipart/form-data; boundary=a7f7ac8d4e2e437c877bb7b8d7cc549c"
            )
        },
    )
    assert response.json() == {
        "file": {
            "filename": "画像.jpg",
            "content": "<file content>",
            "content_type": "image/jpeg",
        },
        "field0": "",
        "field1": None,
    }


def test_multipart_request_with_encoded_value(tmpdir):
    client = tm.get_test_client()
    response = client.post(
        "/multiple",
        data=(
            b"--20b303e711c4ab8c443184ac833ab00f\r\n"
            b"Content-Disposition: form-data; "
            b'name="test1"\r\n\r\n'
            b"Transf\xc3\xa9rer\r\n"
            b"--20b303e711c4ab8c443184ac833ab00f--\r\n"
        ),
        headers={
            "Content-Type": (
                "multipart/form-data; charset=utf-8; "
                "boundary=20b303e711c4ab8c443184ac833ab00f"
            )
        },
    )
    assert response.json() == {"test1": ["Transférer"]}


def test_urlencoded_request_data(tmpdir):
    client = tm.get_test_client()
    response = client.post("/multiple", data={"test1": "data"})
    assert response.json() == {"test1": ["data"]}


def test_no_request_data(tmpdir):
    client = tm.get_test_client()
    response = client.post("/mixed-optional")
    assert response.json() == {"file": None, "field0": "", "field1": None}


def test_urlencoded_percent_encoding(tmpdir):
    client = tm.get_test_client()
    response = client.post("/multiple", data={"test1": "da ta"})
    assert response.json() == {"test1": ["da ta"]}


def test_multipart_multi_field_app_reads_body(tmpdir):
    client = tm.get_test_client()
    response = client.post(
        "/multiple", data={"test1": "key pair"}, files=FORCE_MULTIPART
    )
    assert response.json() == {"test1": ["key pair"]}
