#!/usr/bin/env python3
"""Create or update a webhook integration screenshot using a test fixture."""

# check for the venv
from lib import sanity_check

sanity_check.check_venv(__file__)

import os
import sys

TOOLS_DIR = os.path.abspath(os.path.dirname(__file__))
ROOT_DIR = os.path.dirname(TOOLS_DIR)

sys.path.insert(0, ROOT_DIR)
from scripts.lib.setup_path import setup_path

setup_path()

os.environ["DJANGO_SETTINGS_MODULE"] = "zproject.settings"
import django

django.setup()

import argparse
import base64
import subprocess
from typing import Any, Dict, Optional
from urllib.parse import urlencode, parse_qsl

import requests
import ujson

from scripts.lib.zulip_tools import BOLDRED, ENDC
from tools.lib.test_script import prepare_puppeteer_run
from zerver.models import UserProfile, Message, get_user_by_delivery_email, get_realm
from zerver.lib.actions import (
    do_create_user, notify_created_bot, bulk_add_subscriptions, do_change_avatar_fields)
from zerver.lib.streams import create_stream_if_needed
from zerver.lib.upload import upload_avatar_image
from zerver.lib.integrations import (
    WebhookIntegration, INTEGRATIONS, split_fixture_path, ScreenshotConfig, get_fixture_and_image_paths,
    DOC_SCREENSHOT_CONFIG)
from zerver.lib.webhooks.common import get_fixture_http_headers
from zerver.lib.storage import static_path

def create_integration_bot(integration: WebhookIntegration, bot_name: Optional[str]=None) -> UserProfile:
    realm = get_realm('zulip')
    owner = get_user_by_delivery_email("iago@zulip.com", realm)
    bot_email = f"{integration.name}-bot@example.com"
    if bot_name is None:
        bot_name = f"{integration.name.capitalize()} Bot"
    try:
        bot = UserProfile.objects.get(email=bot_email)
    except UserProfile.DoesNotExist:
        bot = do_create_user(
            email=bot_email,
            password="123",
            realm=owner.realm,
            full_name=bot_name,
            short_name=bot_name,
            bot_type=UserProfile.INCOMING_WEBHOOK_BOT,
            bot_owner=owner,
        )
        notify_created_bot(bot)

        bot_avatar_path = integration.get_bot_avatar_path()
        if bot_avatar_path is not None:
            bot_avatar_path = static_path(bot_avatar_path)
            if os.path.isfile(bot_avatar_path):
                with open(bot_avatar_path, "rb") as f:
                    upload_avatar_image(f, owner, bot)
                    do_change_avatar_fields(bot, UserProfile.AVATAR_FROM_USER)

    return bot

def create_integration_stream(integration: WebhookIntegration, bot: UserProfile) -> None:
    assert isinstance(bot.bot_owner, UserProfile)
    stream, created = create_stream_if_needed(bot.bot_owner.realm, integration.stream_name)
    bulk_add_subscriptions([stream], [bot, bot.bot_owner], from_stream_creation=created)

def get_integration(integration_name: str) -> WebhookIntegration:
    integration = INTEGRATIONS[integration_name]
    assert isinstance(integration, WebhookIntegration), "Not a WebhookIntegration"
    return integration

def get_requests_headers(integration_name: str, fixture_name: str) -> Dict[str, Any]:
    headers = get_fixture_http_headers(integration_name, fixture_name)

    def fix_name(header: str) -> str:
        header = header if not header.startswith('HTTP_') else header[len('HTTP_'):]
        return header.replace('_', '-')

    return {fix_name(k): v for k, v in headers.items()}

def custom_headers(headers_json: str) -> Dict[str, str]:
    if not headers_json:
        return {}
    try:
        return ujson.loads(headers_json)
    except ValueError as ve:
        raise argparse.ArgumentTypeError(
            'Encountered an error while attempting to parse custom headers: {}\n'
            'Note: all strings must be enclosed within "" instead of \'\''.format(ve))

def send_bot_payload_message(bot: UserProfile, integration: WebhookIntegration, fixture_path: str,
                             config: ScreenshotConfig) -> bool:
    # Delete all messages, so new message is the only one it's message group
    Message.objects.filter(sender=bot).delete()
    json_fixture = fixture_path.endswith('.json')
    _, fixture_name = split_fixture_path(fixture_path)

    if fixture_name:
        with open(fixture_path) as f:
            if json_fixture:
                data = ujson.load(f)
            else:
                data = f.read().strip()
    else:
        data = ''

    headers = get_requests_headers(integration.name, fixture_name)
    if config.custom_headers:
        headers.update(config.custom_headers)
    if config.use_basic_auth:
        credentials = base64.b64encode(f'{bot.email}:{bot.api_key}'.encode('utf8')).decode('utf8')
        auth = f'basic {credentials}'
        headers.update(dict(Authorization=auth))

    assert isinstance(bot.bot_owner, UserProfile)
    stream = integration.stream_name or 'devel'
    url = f"{bot.bot_owner.realm.uri}/{integration.url}"
    params = {'api_key': bot.api_key, 'stream': stream}
    if config.extra_params:
        params.update(config.extra_params)

    extra_args = {}
    if not json_fixture and data:
        # We overwrite any params in fixture with our params. stream name, for
        # example, may be defined in the fixture.
        parsed_params = dict(parse_qsl(data))
        parsed_params.update(params)
        params = parsed_params

    elif config.payload_as_query_param:
        params[config.payload_param_name] = ujson.dumps(data)

    else:
        extra_args = {'json': data}

    url = f'{url}?{urlencode(params)}'

    try:
        response = requests.post(url=url, headers=headers, **extra_args)
    except requests.exceptions.ConnectionError:
        print('This tool needs the local dev server to be running. '
              'Please start it using tools/run-dev.py before running this tool.')
        sys.exit(1)
    if response.status_code != 200:
        print(response.json())
        print('Failed to trigger webhook')
        return False
    else:
        print(f'Triggered {integration.name} webhook')
        return True

def capture_last_message_screenshot(bot: UserProfile, image_path: str) -> None:
    message = Message.objects.filter(sender=bot).last()
    if message is None:
        print(f'No message found for {bot.full_name}')
        return
    message_id = str(message.id)
    screenshot_script = os.path.join(TOOLS_DIR, 'message-screenshot.js')
    subprocess.check_call(['node', screenshot_script, message_id, image_path])

def generate_screenshot_from_config(integration_name: str, screenshot_config: ScreenshotConfig) -> None:
    integration = get_integration(integration_name)
    fixture_path, image_path = get_fixture_and_image_paths(integration, screenshot_config)
    bot = create_integration_bot(integration, screenshot_config.bot_name)
    create_integration_stream(integration, bot)
    message_sent = send_bot_payload_message(bot, integration, fixture_path, screenshot_config)
    if message_sent:
        capture_last_message_screenshot(bot, image_path)
        print(f'Screenshot captured to: {BOLDRED}{image_path}{ENDC}')

parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('--all', default=False, action='store_true')
group.add_argument('--integration', type=str, help='Name of the integration')
parser.add_argument('--fixture', type=str, help='Name of the fixture file to use')
parser.add_argument('--image-name', type=str, help='Name for the screenshot image')
parser.add_argument('--image-dir', type=str, help='Directory name where to save the screenshot image')
parser.add_argument('--bot-name', type=str, help='Name to use for the bot')
parser.add_argument('-A', '--use-basic-auth', action='store_true',
                    help='Add basic auth headers to the request')
parser.add_argument('-Q', '--payload-as-query-param', action='store_true',
                    help='Send payload as query param instead of body')
parser.add_argument('-P', '--payload-param-name', type=str,
                    help='Param name to use for the payload')
parser.add_argument('-H', '--custom-headers',
                    type=custom_headers,
                    help='Any additional headers to be sent with the request.')

options = parser.parse_args()
prepare_puppeteer_run()

if options.all:
    for key, value in vars(options).items():
        if key != 'all' and value:
            print('Generating screenshots for all integrations. Ignoring all command-line options')
    for integration_name, screenshot_configs in DOC_SCREENSHOT_CONFIG.items():
        for screenshot_config in screenshot_configs:
            generate_screenshot_from_config(integration_name, screenshot_config)

elif options.fixture:
    config = dict(fixture_name=options.fixture, use_basic_auth=options.use_basic_auth,
                  custom_headers=options.custom_headers,
                  payload_as_query_param=options.payload_as_query_param)
    if options.image_name:
        config['image_name'] = options.image_name
    if options.image_dir:
        config['image_dir'] = options.image_dir
    if options.bot_name:
        config['bot_name'] = options.bot_name
    if options.payload_param_name:
        config['payload_param_name'] = options.payload_param_name
    screenshot_config = ScreenshotConfig(**config)
    generate_screenshot_from_config(options.integration, screenshot_config)

elif options.integration in DOC_SCREENSHOT_CONFIG:
    configs = DOC_SCREENSHOT_CONFIG[options.integration]
    for screenshot_config in configs:
        generate_screenshot_from_config(options.integration, screenshot_config)

else:
    parser.error(
        "Could not find configuration for integration. "
        "You can specify a fixture file to use, using the --fixture flag. "
        "Or add a configuration to zerver.lib.integrations.DOC_SCREENSHOT_CONFIG",
    )