import tempfile
from collections.abc import Callable
from unittest import SkipTest
from urllib.parse import (
    urljoin,
    urlparse,
)

import requests

from galaxy.files import (
    ConfiguredFileSources,
    DictFileSourcesUserContext,
)
from galaxy.files.plugins import FileSourcePluginsConfig
from galaxy.files.sources.util import (
    fetch_drs_to_file,
    RetryOptions,
)
from galaxy.util.config_parsers import parse_allowlist_ips
from galaxy_test.base.populators import DatasetPopulator
from ._framework import ApiTestCase

CONTENT = "My Cool DRS Data\n"

# DRS expects identical get/post for two main API entrypoints.
HTTP_METHODS: list[Callable[[str], requests.Response]] = [requests.get, requests.post]

CHECKSUM_TEST_SLEEP_TIME = 3.0


def user_context_fixture():
    file_sources_config = FileSourcePluginsConfig(fetch_url_allowlist=parse_allowlist_ips(["127.0.0.0/24"]))
    file_sources = ConfiguredFileSources(file_sources_config, load_stock_plugins=True)
    user_context = DictFileSourcesUserContext(
        preferences={
            "oidc|bearer_token": "IBearTokens",
        },
        file_sources=file_sources,
    )
    return user_context


class TestDrsApi(ApiTestCase):
    dataset_populator: DatasetPopulator

    def setUp(self):
        super().setUp()
        self.dataset_populator = DatasetPopulator(self.galaxy_interactor)

    def test_service_info(self):
        api_url = self._url_join("ga4gh/drs/v1/service-info")
        info_response = requests.get(api_url)
        info_response.raise_for_status()

    def test_404_on_private_datasets(self):
        history_id = self.dataset_populator.new_history()
        hda = self.dataset_populator.new_dataset(history_id, content=CONTENT, wait=True)
        dataset_id = hda["id"]
        drs_id = hda["drs_id"]
        self.dataset_populator.make_private(history_id=history_id, dataset_id=dataset_id)
        for method in HTTP_METHODS:
            api_url = self._url_join(f"ga4gh/drs/v1/objects/{drs_id}")
            show_response = method(api_url)
            assert show_response.status_code == 403

    def test_public_data_access(self):
        history_id = self.dataset_populator.new_history()
        hda = self.dataset_populator.new_dataset(history_id, content=CONTENT, wait=True)
        drs_id = hda["drs_id"]
        for method in HTTP_METHODS:
            for _ in range(10):
                api_url = self._url_join(f"ga4gh/drs/v1/objects/{drs_id}")
                show_response = method(api_url)
                show_response.raise_for_status()
                if show_response.status_code != 202:
                    break
                else:
                    import time

                    time.sleep(3)
            response = show_response.json()
            access_methods = response["access_methods"]
            assert len(access_methods) > 0
            access_method = access_methods[0]
            assert access_method["type"].startswith("http")
            access_url = access_method["access_url"]
            url = access_url["url"]
            headers_list = access_url.get("headers") or []
            headers_as_dict = {}
            for header_str in headers_list:
                key, value = header_str.split(": ", 1)
                headers_as_dict[key] = value

            download_response = requests.get(url, headers=headers_as_dict)
            download_response.raise_for_status()
            assert download_response.text == CONTENT

    def test_public_data_access_util_code(self):
        history_id = self.dataset_populator.new_history()
        hda = self.dataset_populator.new_dataset(history_id, content=CONTENT, wait=True)
        drs_id = hda["drs_id"]
        components = urlparse(self.url)
        netloc = components.netloc
        scheme = components.scheme
        if components.path != "/":
            raise SkipTest("Real DRS cannot be served on Galaxy not hosted at root.")
        drs_uri = f"drs://{netloc}/{drs_id}"
        force_http = scheme == "http"
        with tempfile.NamedTemporaryFile(prefix="gxtest_drs") as tf:
            retry_options = RetryOptions()
            retry_options.override_retry_after = CHECKSUM_TEST_SLEEP_TIME
            fetch_drs_to_file(
                drs_uri,
                tf.name,
                user_context=user_context_fixture(),
                force_http=force_http,
                retry_options=retry_options,
            )
            with open(tf.name) as f:
                assert CONTENT == f.read()

    def test_exception_handling_schema(self):
        history_id = self.dataset_populator.new_history()
        hda = self.dataset_populator.new_dataset(history_id, content=CONTENT, wait=True)
        drs_id = hda["drs_id"]

        for method in HTTP_METHODS:
            api_url = self._url_join(f"ga4gh/drs/v1/objects/{drs_id}/access/fakeid")
            error_response = method(api_url)
            assert isinstance(error_response.status_code, int)
            assert error_response.status_code == 404
            error_as_dict = error_response.json()
            assert "status_code" in error_as_dict
            assert "msg" in error_as_dict

    def _url_join(self, suffix):
        return urljoin(self.url, suffix)