import argparse
import base64
import html
import io
import json
import pickle
import urllib.parse as urlparse
import uuid
from functools import wraps

import waitress
from app import app
from app.models.config import Config
from app.request import Request, TorError
from app.utils.bangs import resolve_bang
from app.utils.misc import read_config_bool, get_client_ip
from app.utils.results import add_ip_card
from app.utils.results import bold_search_terms
from app.utils.search import *
from app.utils.session import generate_user_key, valid_user_session
from bs4 import BeautifulSoup as bsoup
from flask import jsonify, make_response, request, redirect, render_template, \
    send_file, session, url_for
from requests import exceptions

# Load DDG bang json files only on init
bang_json = json.load(open(app.config['BANG_FILE']))


def auth_required(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        auth = request.authorization

        # Skip if username/password not set
        whoogle_user = os.getenv('WHOOGLE_USER', '')
        whoogle_pass = os.getenv('WHOOGLE_PASS', '')
        if (not whoogle_user or not whoogle_pass) or (
                auth
                and whoogle_user == auth.username
                and whoogle_pass == auth.password):
            return f(*args, **kwargs)
        else:
            return make_response('Not logged in', 401, {
                'WWW-Authenticate': 'Basic realm="Login Required"'})

    return decorated


@app.before_request
def before_request_func():
    g.request_params = (
        request.args if request.method == 'GET' else request.form
    )
    g.cookies_disabled = False

    # Generate session values for user if unavailable
    if not valid_user_session(session):
        session['config'] = json.load(open(app.config['DEFAULT_CONFIG'])) \
            if os.path.exists(app.config['DEFAULT_CONFIG']) else {}
        session['uuid'] = str(uuid.uuid4())
        session['key'] = generate_user_key(True)

        # Flag cookies as possibly disabled in order to prevent against
        # unnecessary session directory expansion
        g.cookies_disabled = True

    # Handle https upgrade
    if needs_https(request.url):
        return redirect(
            request.url.replace('http://', 'https://', 1),
            code=308)

    g.user_config = Config(**session['config'])

    if not g.user_config.url:
        g.user_config.url = request.url_root.replace(
            'http://',
            'https://') if os.getenv('HTTPS_ONLY', False) else request.url_root

    g.user_request = Request(
        request.headers.get('User-Agent'),
        request.url_root,
        config=g.user_config)

    g.app_location = g.user_config.url


@app.after_request
def after_request_func(resp):
    # Check if address consistently has cookies blocked,
    # in which case start removing session files after creation.
    #
    # Note: This is primarily done to prevent overpopulation of session
    # directories, since browsers that block cookies will still trigger
    # Flask's session creation routine with every request.
    if g.cookies_disabled and request.remote_addr not in app.no_cookie_ips:
        app.no_cookie_ips.append(request.remote_addr)
    elif g.cookies_disabled and request.remote_addr in app.no_cookie_ips:
        session_list = list(session.keys())
        for key in session_list:
            session.pop(key)

    resp.headers['Content-Security-Policy'] = app.config['CSP']
    if os.environ.get('HTTPS_ONLY', False):
        resp.headers['Content-Security-Policy'] += 'upgrade-insecure-requests'

    return resp


@app.errorhandler(404)
def unknown_page(e):
    app.logger.warn(e)
    return redirect(g.app_location)


@app.route('/healthz', methods=['GET'])
def healthz():
    return ''


@app.route('/home', methods=['GET'])
def home():
    return redirect(url_for('.index'))


@app.route('/', methods=['GET'])
@auth_required
def index():
    # Reset keys
    session['key'] = generate_user_key(g.cookies_disabled)

    # Redirect if an error was raised
    if 'error_message' in session and session['error_message']:
        error_message = session['error_message']
        session['error_message'] = ''
        return render_template('error.html', error_message=error_message)

    return render_template('index.html',
                           languages=app.config['LANGUAGES'],
                           countries=app.config['COUNTRIES'],
                           themes=app.config['THEMES'],
                           translation=app.config['TRANSLATIONS'][
                               g.user_config.get_localization_lang()
                           ],
                           logo=render_template(
                               'logo.html',
                               dark=g.user_config.dark),
                           config_disabled=app.config['CONFIG_DISABLE'],
                           config=g.user_config,
                           tor_available=int(os.environ.get('TOR_AVAILABLE')),
                           version_number=app.config['VERSION_NUMBER'])


@app.route('/opensearch.xml', methods=['GET'])
def opensearch():
    opensearch_url = g.app_location
    if opensearch_url.endswith('/'):
        opensearch_url = opensearch_url[:-1]

    # Enforce https for opensearch template
    if needs_https(opensearch_url):
        opensearch_url = opensearch_url.replace('http://', 'https://', 1)

    get_only = g.user_config.get_only or 'Chrome' in request.headers.get(
        'User-Agent')

    return render_template(
        'opensearch.xml',
        main_url=opensearch_url,
        request_type='' if get_only else 'method="post"'
    ), 200, {'Content-Disposition': 'attachment; filename="opensearch.xml"'}


@app.route('/search.html', methods=['GET'])
def search_html():
    search_url = g.app_location
    if search_url.endswith('/'):
        search_url = search_url[:-1]
    return render_template('search.html', url=search_url)


@app.route('/autocomplete', methods=['GET', 'POST'])
def autocomplete():
    ac_var = 'WHOOGLE_AUTOCOMPLETE'
    if os.getenv(ac_var) and not read_config_bool(ac_var):
        return jsonify({})

    q = g.request_params.get('q')
    if not q:
        # FF will occasionally (incorrectly) send the q field without a
        # mimetype in the format "b'q=<query>'" through the request.data field
        q = str(request.data).replace('q=', '')

    # Search bangs if the query begins with "!", but not "! " (feeling lucky)
    if q.startswith('!') and len(q) > 1 and not q.startswith('! '):
        return jsonify([q, [bang_json[_]['suggestion'] for _ in bang_json if
                            _.startswith(q)]])

    if not q and not request.data:
        return jsonify({'?': []})
    elif request.data:
        q = urlparse.unquote_plus(
            request.data.decode('utf-8').replace('q=', ''))

    # Return a list of suggestions for the query
    #
    # Note: If Tor is enabled, this returns nothing, as the request is
    # almost always rejected
    return jsonify([
        q,
        g.user_request.autocomplete(q) if not g.user_config.tor else []
    ])


@app.route('/search', methods=['GET', 'POST'])
@auth_required
def search():
    # Update user config if specified in search args
    g.user_config = g.user_config.from_params(g.request_params)

    search_util = Search(request, g.user_config, session,
                         cookies_disabled=g.cookies_disabled)
    query = search_util.new_search_query()

    bang = resolve_bang(query=query, bangs_dict=bang_json)
    if bang != '':
        return redirect(bang)

    # Redirect to home if invalid/blank search
    if not query:
        return redirect('/')

    # Generate response and number of external elements from the page
    try:
        response = search_util.generate_response()
    except TorError as e:
        session['error_message'] = e.message + (
            "\\n\\nTor config is now disabled!" if e.disable else "")
        session['config']['tor'] = False if e.disable else session['config'][
            'tor']
        return redirect(url_for('.index'))

    if search_util.feeling_lucky:
        return redirect(response, code=303)

    # If the user is attempting to translate a string, determine the correct
    # string for formatting the lingva.ml url
    localization_lang = g.user_config.get_localization_lang()
    translation = app.config['TRANSLATIONS'][localization_lang]
    translate_to = localization_lang.replace('lang_', '')

    # Return 503 if temporarily blocked by captcha
    resp_code = 503 if has_captcha(str(response)) else 200
    response = bold_search_terms(response, query)

    # Feature to display IP address
    if search_util.check_kw_ip():
        html_soup = bsoup(str(response), 'html.parser')
        response = add_ip_card(html_soup, get_client_ip(request))

    return render_template(
        'display.html',
        query=urlparse.unquote(query),
        search_type=search_util.search_type,
        config=g.user_config,
        lingva_url=app.config['TRANSLATE_URL'],
        translation=translation,
        translate_to=translate_to,
        translate_str=query.replace(
            'translate', ''
        ).replace(
            translation['translate'], ''
        ),
        is_translation=any(
            _ in query.lower() for _ in [translation['translate'], 'translate']
        ) and not search_util.search_type,  # Standard search queries only
        response=html.unescape(str(response)),
        version_number=app.config['VERSION_NUMBER'],
        search_header=(render_template(
            'header.html',
            config=g.user_config,
            logo=render_template('logo.html', dark=g.user_config.dark),
            query=urlparse.unquote(query),
            search_type=search_util.search_type,
            mobile=g.user_request.mobile)
                       if 'isch' not in
                          search_util.search_type else '')), resp_code


@app.route('/config', methods=['GET', 'POST', 'PUT'])
@auth_required
def config():
    config_disabled = app.config['CONFIG_DISABLE']
    if request.method == 'GET':
        return json.dumps(g.user_config.__dict__)
    elif request.method == 'PUT' and not config_disabled:
        if 'name' in request.args:
            config_pkl = os.path.join(
                app.config['CONFIG_PATH'],
                request.args.get('name'))
            session['config'] = (pickle.load(open(config_pkl, 'rb'))
                                 if os.path.exists(config_pkl)
                                 else session['config'])
            return json.dumps(session['config'])
        else:
            return json.dumps({})
    elif not config_disabled:
        config_data = request.form.to_dict()
        if 'url' not in config_data or not config_data['url']:
            config_data['url'] = g.user_config.url

        # Save config by name to allow a user to easily load later
        if 'name' in request.args:
            pickle.dump(
                config_data,
                open(os.path.join(
                    app.config['CONFIG_PATH'],
                    request.args.get('name')), 'wb'))

        # Overwrite default config if user has cookies disabled
        if g.cookies_disabled:
            open(app.config['DEFAULT_CONFIG'], 'w').write(
                json.dumps(config_data, indent=4))

        session['config'] = config_data
        return redirect(config_data['url'])
    else:
        return redirect(url_for('.index'), code=403)


@app.route('/url', methods=['GET'])
@auth_required
def url():
    if 'url' in request.args:
        return redirect(request.args.get('url'))

    q = request.args.get('q')
    if len(q) > 0 and 'http' in q:
        return redirect(q)
    else:
        return render_template(
            'error.html',
            error_message='Unable to resolve query: ' + q)


@app.route('/imgres')
@auth_required
def imgres():
    return redirect(request.args.get('imgurl'))


@app.route('/element')
@auth_required
def element():
    cipher_suite = Fernet(session['key'])
    src_url = cipher_suite.decrypt(request.args.get('url').encode()).decode()
    src_type = request.args.get('type')

    try:
        file_data = g.user_request.send(base_url=src_url).content
        tmp_mem = io.BytesIO()
        tmp_mem.write(file_data)
        tmp_mem.seek(0)

        return send_file(tmp_mem, mimetype=src_type)
    except exceptions.RequestException:
        pass

    empty_gif = base64.b64decode(
        'R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==')
    return send_file(io.BytesIO(empty_gif), mimetype='image/gif')


@app.route('/window')
@auth_required
def window():
    get_body = g.user_request.send(base_url=request.args.get('location')).text
    get_body = get_body.replace('src="/',
                                'src="' + request.args.get('location') + '"')
    get_body = get_body.replace('href="/',
                                'href="' + request.args.get('location') + '"')

    results = bsoup(get_body, 'html.parser')

    for script in results('script'):
        script.decompose()

    return render_template(
        'display.html',
        response=results,
        translation=app.config['TRANSLATIONS'][
            g.user_config.get_localization_lang()
        ]
    )


def run_app() -> None:
    parser = argparse.ArgumentParser(
        description='Whoogle Search console runner')
    parser.add_argument(
        '--port',
        default=5000,
        metavar='<port number>',
        help='Specifies a port to run on (default 5000)')
    parser.add_argument(
        '--host',
        default='127.0.0.1',
        metavar='<ip address>',
        help='Specifies the host address to use (default 127.0.0.1)')
    parser.add_argument(
        '--debug',
        default=False,
        action='store_true',
        help='Activates debug mode for the server (default False)')
    parser.add_argument(
        '--https-only',
        default=False,
        action='store_true',
        help='Enforces HTTPS redirects for all requests')
    parser.add_argument(
        '--userpass',
        default='',
        metavar='<username:password>',
        help='Sets a username/password basic auth combo (default None)')
    parser.add_argument(
        '--proxyauth',
        default='',
        metavar='<username:password>',
        help='Sets a username/password for a HTTP/SOCKS proxy (default None)')
    parser.add_argument(
        '--proxytype',
        default='',
        metavar='<socks4|socks5|http>',
        help='Sets a proxy type for all connections (default None)')
    parser.add_argument(
        '--proxyloc',
        default='',
        metavar='<location:port>',
        help='Sets a proxy location for all connections (default None)')
    args = parser.parse_args()

    if args.userpass:
        user_pass = args.userpass.split(':')
        os.environ['WHOOGLE_USER'] = user_pass[0]
        os.environ['WHOOGLE_PASS'] = user_pass[1]

    if args.proxytype and args.proxyloc:
        if args.proxyauth:
            proxy_user_pass = args.proxyauth.split(':')
            os.environ['WHOOGLE_PROXY_USER'] = proxy_user_pass[0]
            os.environ['WHOOGLE_PROXY_PASS'] = proxy_user_pass[1]
        os.environ['WHOOGLE_PROXY_TYPE'] = args.proxytype
        os.environ['WHOOGLE_PROXY_LOC'] = args.proxyloc

    os.environ['HTTPS_ONLY'] = '1' if args.https_only else ''

    if args.debug:
        app.run(host=args.host, port=args.port, debug=args.debug)
    else:
        waitress.serve(app, listen="{}:{}".format(args.host, args.port))