import base64
from io import StringIO

import orjson
from django.conf import settings

from zerver.lib.test_classes import ZulipTestCase
from zerver.lib.test_helpers import (
    create_s3_buckets,
    get_test_image_file,
    override_settings,
    use_s3_backend,
)
from zerver.lib.upload import upload_backend, upload_emoji_image
from zerver.lib.users import get_api_key


class ThumbnailTest(ZulipTestCase):

    @use_s3_backend
    def test_s3_source_type(self) -> None:
        def get_file_path_urlpart(uri: str, size: str='') -> str:
            url_in_result = 'smart/filters:no_upscale()%s/%s/source_type/s3'
            sharpen_filter = ''
            if size:
                url_in_result = f'/{size}/{url_in_result}'
                sharpen_filter = ':sharpen(0.5,0.2,true)'
            hex_uri = base64.urlsafe_b64encode(uri.encode()).decode('utf-8')
            return url_in_result % (sharpen_filter, hex_uri)

        create_s3_buckets(
            settings.S3_AUTH_UPLOADS_BUCKET,
            settings.S3_AVATAR_BUCKET)

        hamlet = self.example_user('hamlet')
        self.login_user(hamlet)
        fp = StringIO("zulip!")
        fp.name = "zulip.jpeg"

        result = self.client_post("/json/user_uploads", {'file': fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        self.assertIn("uri", json)
        uri = json["uri"]
        base = '/user_uploads/'
        self.assertEqual(base, uri[:len(base)])

        # Test full size image.
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri)
        self.assertIn(expected_part_url, result.url)

        # Test thumbnail size.
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "thumbnail"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri, '0x300')
        self.assertIn(expected_part_url, result.url)

        # Test custom emoji URLs in Zulip messages.
        user_profile = self.example_user("hamlet")
        file_name = "emoji.png"

        with get_test_image_file("img.png") as image_file:
            upload_emoji_image(image_file, file_name, user_profile)
        custom_emoji_url = upload_backend.get_emoji_url(file_name, user_profile.realm_id)
        emoji_url_base = '/user_avatars/'
        self.assertEqual(emoji_url_base, custom_emoji_url[:len(emoji_url_base)])

        # Test full size custom emoji image (for emoji link in messages case).
        result = self.client_get("/thumbnail", {"url": custom_emoji_url[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        self.assertIn(custom_emoji_url, result.url)

        # Tests the /api/v1/thumbnail API endpoint with standard API auth
        self.logout()
        result = self.api_get(
            hamlet,
            "/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri)
        self.assertIn(expected_part_url, result.url)

        # Test with another user trying to access image using thumbor.
        self.login('iago')
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 403, result)
        self.assert_in_response("You are not authorized to view this file.", result)

    def test_external_source_type(self) -> None:
        def run_test_with_image_url(image_url: str) -> None:
            # Test full size image.
            self.login('hamlet')
            encoded_url = base64.urlsafe_b64encode(image_url.encode()).decode('utf-8')
            result = self.client_get("/thumbnail", {"url": image_url, "size": "full"})
            self.assertEqual(result.status_code, 302, result)
            expected_part_url = '/smart/filters:no_upscale()/' + encoded_url + '/source_type/external'
            self.assertIn(expected_part_url, result.url)

            # Test thumbnail size.
            result = self.client_get("/thumbnail", {"url": image_url, "size": "thumbnail"})
            self.assertEqual(result.status_code, 302, result)
            expected_part_url = '/0x300/smart/filters:no_upscale():sharpen(0.5,0.2,true)/' + encoded_url + '/source_type/external'
            self.assertIn(expected_part_url, result.url)

            # Test API endpoint with standard API authentication.
            self.logout()
            user_profile = self.example_user("hamlet")
            result = self.api_get(user_profile,
                                  "/thumbnail", {"url": image_url, "size": "thumbnail"})
            self.assertEqual(result.status_code, 302, result)
            expected_part_url = '/0x300/smart/filters:no_upscale():sharpen(0.5,0.2,true)/' + encoded_url + '/source_type/external'
            self.assertIn(expected_part_url, result.url)

            # Test API endpoint with legacy API authentication.
            user_profile = self.example_user("hamlet")
            result = self.client_get("/thumbnail", {"url": image_url, "size": "thumbnail", "api_key": get_api_key(user_profile)})
            self.assertEqual(result.status_code, 302, result)
            expected_part_url = '/0x300/smart/filters:no_upscale():sharpen(0.5,0.2,true)/' + encoded_url + '/source_type/external'
            self.assertIn(expected_part_url, result.url)

            # Test a second logged-in user; they should also be able to access it
            user_profile = self.example_user("iago")
            result = self.client_get("/thumbnail", {"url": image_url, "size": "thumbnail", "api_key": get_api_key(user_profile)})
            self.assertEqual(result.status_code, 302, result)
            expected_part_url = '/0x300/smart/filters:no_upscale():sharpen(0.5,0.2,true)/' + encoded_url + '/source_type/external'
            self.assertIn(expected_part_url, result.url)

            # Test with another user trying to access image using thumbor.
            # File should be always accessible to user in case of external source
            self.login('iago')
            result = self.client_get("/thumbnail", {"url": image_url, "size": "full"})
            self.assertEqual(result.status_code, 302, result)
            expected_part_url = '/smart/filters:no_upscale()/' + encoded_url + '/source_type/external'
            self.assertIn(expected_part_url, result.url)

        image_url = 'https://images.foobar.com/12345'
        run_test_with_image_url(image_url)

        image_url = 'http://images.foobar.com/12345'
        run_test_with_image_url(image_url)

        image_url = '//images.foobar.com/12345'
        run_test_with_image_url(image_url)

    def test_local_file_type(self) -> None:
        def get_file_path_urlpart(uri: str, size: str='') -> str:
            url_in_result = 'smart/filters:no_upscale()%s/%s/source_type/local_file'
            sharpen_filter = ''
            if size:
                url_in_result = f'/{size}/{url_in_result}'
                sharpen_filter = ':sharpen(0.5,0.2,true)'
            hex_uri = base64.urlsafe_b64encode(uri.encode()).decode('utf-8')
            return url_in_result % (sharpen_filter, hex_uri)

        self.login('hamlet')
        fp = StringIO("zulip!")
        fp.name = "zulip.jpeg"

        result = self.client_post("/json/user_uploads", {'file': fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        self.assertIn("uri", json)
        uri = json["uri"]
        base = '/user_uploads/'
        self.assertEqual(base, uri[:len(base)])

        # Test full size image.
        # We remove the forward slash infront of the `/user_uploads/` to match
        # Markdown behaviour.
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri)
        self.assertIn(expected_part_url, result.url)

        # Test thumbnail size.
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "thumbnail"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri, '0x300')
        self.assertIn(expected_part_url, result.url)

        # Test with a Unicode filename.
        fp = StringIO("zulip!")
        fp.name = "μένει.jpg"

        result = self.client_post("/json/user_uploads", {'file': fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        self.assertIn("uri", json)
        uri = json["uri"]

        # We remove the forward slash infront of the `/user_uploads/` to match
        # Markdown behaviour.
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri)
        self.assertIn(expected_part_url, result.url)

        # Test custom emoji urls in Zulip messages.
        user_profile = self.example_user("hamlet")
        file_name = "emoji.png"

        with get_test_image_file("img.png") as image_file:
            upload_emoji_image(image_file, file_name, user_profile)
        custom_emoji_url = upload_backend.get_emoji_url(file_name, user_profile.realm_id)
        emoji_url_base = '/user_avatars/'
        self.assertEqual(emoji_url_base, custom_emoji_url[:len(emoji_url_base)])

        # Test full size custom emoji image (for emoji link in messages case).
        result = self.client_get("/thumbnail", {"url": custom_emoji_url[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        self.assertIn(custom_emoji_url, result.url)

        # Tests the /api/v1/thumbnail API endpoint with HTTP basic auth.
        self.logout()
        user_profile = self.example_user("hamlet")
        result = self.api_get(
            user_profile,
            "/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri)
        self.assertIn(expected_part_url, result.url)

        # Tests the /api/v1/thumbnail API endpoint with ?api_key
        # auth.
        user_profile = self.example_user("hamlet")
        result = self.client_get(
            "/thumbnail", {"url": uri[1:], "size": "full", "api_key": get_api_key(user_profile)})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri)
        self.assertIn(expected_part_url, result.url)

        # Test with another user trying to access image using thumbor.
        self.login('iago')
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 403, result)
        self.assert_in_response("You are not authorized to view this file.", result)

    @override_settings(THUMBOR_URL='127.0.0.1:9995')
    def test_with_static_files(self) -> None:
        self.login('hamlet')
        uri = '/static/images/cute/turtle.png'
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        self.assertEqual(uri, result.url)

    def test_with_thumbor_disabled(self) -> None:
        self.login('hamlet')
        fp = StringIO("zulip!")
        fp.name = "zulip.jpeg"

        result = self.client_post("/json/user_uploads", {'file': fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        self.assertIn("uri", json)
        uri = json["uri"]
        base = '/user_uploads/'
        self.assertEqual(base, uri[:len(base)])

        with self.settings(THUMBOR_URL=''):
            result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        self.assertEqual(uri, result.url)

        uri = 'https://www.google.com/images/srpr/logo4w.png'
        with self.settings(THUMBOR_URL=''):
            result = self.client_get("/thumbnail", {"url": uri, "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        base = 'https://external-content.zulipcdn.net/external_content/56c362a24201593891955ff526b3b412c0f9fcd2/68747470733a2f2f7777772e676f6f676c652e636f6d2f696d616765732f737270722f6c6f676f34772e706e67'
        self.assertEqual(base, result.url)

        uri = 'http://www.google.com/images/srpr/logo4w.png'
        with self.settings(THUMBOR_URL=''):
            result = self.client_get("/thumbnail", {"url": uri, "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        base = 'https://external-content.zulipcdn.net/external_content/7b6552b60c635e41e8f6daeb36d88afc4eabde79/687474703a2f2f7777772e676f6f676c652e636f6d2f696d616765732f737270722f6c6f676f34772e706e67'
        self.assertEqual(base, result.url)

        uri = '//www.google.com/images/srpr/logo4w.png'
        with self.settings(THUMBOR_URL=''):
            result = self.client_get("/thumbnail", {"url": uri, "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        base = 'https://external-content.zulipcdn.net/external_content/676530cf4b101d56f56cc4a37c6ef4d4fd9b0c03/2f2f7777772e676f6f676c652e636f6d2f696d616765732f737270722f6c6f676f34772e706e67'
        self.assertEqual(base, result.url)

    def test_with_different_THUMBOR_URL(self) -> None:
        self.login('hamlet')
        fp = StringIO("zulip!")
        fp.name = "zulip.jpeg"

        result = self.client_post("/json/user_uploads", {'file': fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        self.assertIn("uri", json)
        uri = json["uri"]
        base = '/user_uploads/'
        self.assertEqual(base, uri[:len(base)])

        hex_uri = base64.urlsafe_b64encode(uri.encode()).decode('utf-8')
        with self.settings(THUMBOR_URL='http://test-thumborhost.com'):
            result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        base = 'http://test-thumborhost.com/'
        self.assertEqual(base, result.url[:len(base)])
        expected_part_url = '/smart/filters:no_upscale()/' + hex_uri + '/source_type/local_file'
        self.assertIn(expected_part_url, result.url)

    def test_with_different_sizes(self) -> None:
        def get_file_path_urlpart(uri: str, size: str='') -> str:
            url_in_result = 'smart/filters:no_upscale()%s/%s/source_type/local_file'
            sharpen_filter = ''
            if size:
                url_in_result = f'/{size}/{url_in_result}'
                sharpen_filter = ':sharpen(0.5,0.2,true)'
            hex_uri = base64.urlsafe_b64encode(uri.encode()).decode('utf-8')
            return url_in_result % (sharpen_filter, hex_uri)

        self.login('hamlet')
        fp = StringIO("zulip!")
        fp.name = "zulip.jpeg"

        result = self.client_post("/json/user_uploads", {'file': fp})
        self.assert_json_success(result)
        json = orjson.loads(result.content)
        self.assertIn("uri", json)
        uri = json["uri"]
        base = '/user_uploads/'
        self.assertEqual(base, uri[:len(base)])

        # Test with size supplied as a query parameter.
        # size=thumbnail should return a 0x300 sized image.
        # size=full should return the original resolution image.
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "thumbnail"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri, '0x300')
        self.assertIn(expected_part_url, result.url)

        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "full"})
        self.assertEqual(result.status_code, 302, result)
        expected_part_url = get_file_path_urlpart(uri)
        self.assertIn(expected_part_url, result.url)

        # Test with size supplied as a query parameter where size is anything
        # else than 'full' or 'thumbnail'. Result should be an error message.
        result = self.client_get("/thumbnail", {"url": uri[1:], "size": "480x360"})
        self.assertEqual(result.status_code, 403, result)
        self.assert_in_response("Invalid size.", result)

        # Test with no size param supplied. In this case as well we show an
        # error message.
        result = self.client_get("/thumbnail", {"url": uri[1:]})
        self.assertEqual(result.status_code, 400, "Missing 'size' argument")