import configparser
import json
import os
import re
import sys
from os.path import join, dirname, expanduser

import ansible_runner
import yaml
from aiohttp import web, ClientSession

try:
    import boto3

    HAS_BOTO3 = True
except ImportError:
    HAS_BOTO3 = False

try:
    import requests

    HAS_REQUESTS = True
except ImportError:
    HAS_REQUESTS = False

try:
    from google.auth.transport.requests import AuthorizedSession
    from google.oauth2 import service_account

    HAS_GOOGLE_LIBRARIES = True
except ImportError:
    HAS_GOOGLE_LIBRARIES = False

try:
    from azure.mgmt.automation import AutomationClient
    import azure.mgmt.automation.models as AutomationModel

    HAS_AZURE_LIBRARIES = True
except ImportError:
    HAS_AZURE_LIBRARIES = False

try:
    from cs import AIOCloudStack, CloudStackApiException

    HAS_CS_LIBRARIES = True
except ImportError:
    HAS_CS_LIBRARIES = False

routes = web.RouteTableDef()
PROJECT_ROOT = dirname(dirname(__file__))
pool = None
task_future = None
task_program = ''


class Status:
    RUNNING = 'running'
    ERROR = 'error'
    CANCELLED = 'cancelled'
    DONE = 'done'
    NEW = None


class Playbook:

    def __init__(self):
        self.status = Status.NEW
        self.want_cancel = False
        self.events = []
        self.config_vars = {}
        self._runner = None

    def event_handler(self, data: dict) -> None:
        if data['event'] == 'runner_on_ok':
            # Looking for '-passout pass:"{{ CA_password }}"'
            if 'Build the CA pair' in data['event_data']['task']:
                m = re.match(r'-passout pass:\"(?P<password>.*)\"', data['event_data']['cmd'])
                if m:
                    self.config_vars['CA_password'] = m.group('password')

            # Looking for '-passout pass:"{{ p12_export_password }}"'
            if "Build the client's p12" in data['event_data']['task']:
                m = re.match(r'-passout pass:\"(?P<password>.*)\"', data['event_data']['cmd'])
                if m:
                    self.config_vars['p12_export_password'] = m.group('password')

            # Looking for 'DNS = {{ wireguard_dns_servers }}'
            if "Generate QR codes" in data['event_data']['task']:
                self.config_vars['host'] = data['event_data']['host']
                m = re.match(r'DNS = (?P<dns>.*)\n\n', data['event_data']['cmd'])
                if m:
                    self.config_vars['local_service_ip'] = m.group('dns')
            self.events.append(data)

    def cancel_handler(self) -> bool:
        if self.want_cancel:
            self.status = Status.CANCELLED
        return self.want_cancel

    def cancel(self) -> None:
        self.want_cancel = True

    def run(self, extra_vars: dict) -> None:
        self.want_cancel = False
        self.status = Status.RUNNING
        _, runner = ansible_runner.run_async(private_data_dir='.',
                                             playbook='main.yml',
                                             extravars=extra_vars,
                                             cancel_callback=self.cancel_handler,
                                             event_handler=self.event_handler)
        self._runner = runner


playbook = Playbook()


def run_playbook(data: dict):
    return playbook.run(data)


@routes.get('/')
async def handle_index(_):
    with open(join(PROJECT_ROOT, 'app', 'static', 'index.html'), 'r') as f:
        return web.Response(body=f.read(), content_type='text/html')


@routes.get('/playbook')
async def playbook_get_handler(_):
    return web.json_response({
        'status': playbook.status,
        'result': playbook.config_vars if playbook.status == Status.DONE else {},
        'events': playbook.events,
    })


@routes.post('/playbook')
async def playbook_post_handler(request):
    data = await request.json()
    run_playbook(data)
    return web.json_response({'ok': True})


@routes.delete('/playbook')
async def playbook_delete_handler(_):
    playbook.cancel()
    return web.json_response({'ok': True})


@routes.get('/config')
async def get_config(_):
    with open(join(PROJECT_ROOT, 'config.cfg'), 'r') as f:
        config = yaml.safe_load(f.read())
        return web.json_response(config)


@routes.post('/config')
async def post_config(request):
    data = await request.json()
    with open(join(PROJECT_ROOT, 'config.cfg'), 'w') as f:
        try:
            config = yaml.safe_dump(data)
        except Exception as e:
            return web.json_response({'error': {
                'code': type(e).__name__,
                'message': e,
            }}, status=400)
        else:
            f.write(config)
            return web.json_response({'ok': True})


@routes.post('/exit')
async def post_exit(_):
    if task_future and task_future.done():
        sys.exit(0)
    else:
        sys.exit(1)


@routes.get('/do_config')
async def check_do_config(_):
    return web.json_response({'has_secret': 'DO_API_TOKEN' in os.environ})


@routes.post('/do_regions')
async def do_regions(request):
    data = await request.json()
    token = data.get('token', os.environ.get('DO_API_TOKEN'))
    if not token:
        return web.json_response({'error': 'no token provided'}, status=400)

    headers = {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer {0}'.format(token),
    }
    async with ClientSession(headers=headers) as session:
        async with session.get('https://api.digitalocean.com/v2/regions') as r:
            json_body = await r.json()
            return web.json_response(json_body, status=r.status)


@routes.get('/aws_config')
async def aws_config(_):
    if not HAS_BOTO3:
        return web.json_response({'error': 'missing_boto'}, status=400)
    return web.json_response(
        {'has_secret': 'AWS_ACCESS_KEY_ID' in os.environ and 'AWS_SECRET_ACCESS_KEY' in os.environ})


@routes.post('/lightsail_regions')
async def lightsail_regions(request):
    data = await request.json()
    client = boto3.client(
        'lightsail',
        aws_access_key_id=data.get('aws_access_key'),
        aws_secret_access_key=data.get('aws_secret_key')
    )
    response = client.get_regions(
        includeAvailabilityZones=False
    )
    return web.json_response(response)


@routes.post('/ec2_regions')
async def ec2_regions(request):
    data = await request.json()
    client = boto3.client(
        'ec2',
        aws_access_key_id=data.get('aws_access_key'),
        aws_secret_access_key=data.get('aws_secret_key')
    )
    response = client.describe_regions()['Regions']
    return web.json_response(response)


@routes.get('/gce_config')
async def check_gce_config(_):
    if not HAS_REQUESTS:
        return web.json_response({'error': 'missing_requests'}, status=400)
    if not HAS_GOOGLE_LIBRARIES:
        return web.json_response({'error': 'missing_google'}, status=400)
    gce_file = join(PROJECT_ROOT, 'configs', 'gce.json')
    response = {}
    try:
        json.loads(open(gce_file, 'r').read())['project_id']
        response['status'] = 'ok'
    except IOError:
        response['status'] = 'not_available'
    except ValueError:
        response['status'] = 'wrong_format'

    return web.json_response(response)


@routes.post('/gce_regions')
async def gce_regions(request):
    data = await request.json()
    gce_file_name = join(PROJECT_ROOT, 'configs', 'gce.json')
    if data.get('project_id'):
        # File is missing, save it. We can't get file path from browser :(
        with open(gce_file_name, 'w') as f:
            f.write(json.dumps(data))
    else:
        with open(gce_file_name, 'r') as f:
            data = json.loads(f.read())

    response = AuthorizedSession(
        service_account.Credentials.from_service_account_info(
            data).with_scopes(
            ['https://www.googleapis.com/auth/compute'])).get(
        'https://www.googleapis.com/compute/v1/projects/{project_id}/regions'.format(
            project_id=data['project_id'])
    )

    return web.json_response(json.loads(response.content))


@routes.get('/vultr_config')
async def check_vultr_config(request):
    response = {'has_secret': False}
    if 'VULTR_API_CONFIG' in os.environ:
        try:
            open(os.environ['VULTR_API_CONFIG'], 'r').read()
            response['has_secret'] = True
        except IOError:
            pass
    try:
        default_path = expanduser(join('~', '.vultr.ini'))
        open(default_path, 'r').read()
        response['has_secret'] = True
    except IOError:
        pass
    return web.json_response(response)


@routes.post('/vultr_config')
async def save_vultr_config(request):
    data = await request.json()
    token = data.get('token')
    path = os.environ.get('VULTR_API_CONFIG') or expanduser(join('~', '.vultr.ini'))
    with open(path, 'w') as f:
        try:
            f.write('[default]\nkey = {0}'.format(token))
        except IOError:
            return web.json_response({'error': 'can not save config file'}, status=400)
    return web.json_response({'saved_to': path})


@routes.get('/vultr_regions')
async def vultr_regions(_):
    async with ClientSession() as session:
        async with session.get('https://api.vultr.com/v1/regions/list') as r:
            json_body = await r.json()
            return web.json_response(json_body)


@routes.get('/scaleway_config')
async def check_scaleway_config(_):
    return web.json_response({"has_secret": 'SCW_TOKEN' in os.environ})


@routes.get('/hetzner_config')
async def check_hetzner_config(_):
    return web.json_response({"has_secret": 'HCLOUD_TOKEN' in os.environ})


@routes.post('/hetzner_regions')
async def hetzner_regions(request):
    data = await request.json()
    token = data.get('token', os.environ.get('HCLOUD_TOKEN'))
    if not token:
        return web.json_response({'error': 'no token provided'}, status=400)

    headers = {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer {0}'.format(token),
    }
    async with ClientSession(headers=headers) as session:
        async with session.get('https://api.hetzner.cloud/v1/datacenters') as r:
            json_body = await r.json()
            return web.json_response(json_body)


@routes.get('/azure_config')
async def azure_config(_):
    if not HAS_REQUESTS:
        return web.json_response({'error': 'missing_requests'}, status=400)
    if not HAS_AZURE_LIBRARIES:
        return web.json_response({'error': 'missing_azure'}, status=400)
    response = {'status': 'ok'}
    return web.json_response(response)


@routes.get('/azure_regions')
async def azure_regions(_):
    with open(join(PROJECT_ROOT, 'roles', 'cloud-azure', 'defaults', 'main.yml'), 'r') as f:
        regions_json = yaml.safe_load(f.read())
        regions = json.loads(regions_json['_azure_regions'])
        return web.json_response(regions)


@routes.get('/linode_config')
async def linode_config(_):
    return web.json_response({"has_secret": 'LINODE_API_TOKEN' in os.environ})


@routes.get('/linode_regions')
async def linode_regions(_):
    async with ClientSession() as session:
        async with session.get('https://api.linode.com/v4/regions') as r:
            json_body = await r.json()
            return web.json_response(json_body)


@routes.get('/cloudstack_config')
async def check_cloudstack_config(_):
    if not HAS_REQUESTS:
        return web.json_response({'error': 'missing_requests'}, status=400)
    if not HAS_CS_LIBRARIES:
        return web.json_response({'error': 'missing_cloudstack'}, status=400)
    response = {'has_secret': _read_cloudstack_config() is not None}
    return web.json_response(response)


def _read_cloudstack_config():
    if 'CLOUDSTACK_CONFIG' in os.environ:
        try:
            return open(os.environ['CLOUDSTACK_CONFIG'], 'r').read()
        except IOError:
            pass
    # check default path
    default_path = expanduser(join('~', '.cloudstack.ini'))
    try:
        return open(default_path, 'r').read()
    except IOError:
        pass
    return None


@routes.post('/cloudstack_regions')
async def cloudstack_regions(request):
    data = await request.json()
    client_config = data.get('token')
    config = configparser.ConfigParser()
    config.read_string(_read_cloudstack_config() or client_config)
    section = config[config.sections()[0]]
    client = AIOCloudStack(**section)
    try:
        zones = await client.listZones(fetch_list=True)
    except CloudStackApiException as resp:
        return web.json_response({
            'cloud_stack_error': resp.error
        }, status=400)
    # if config was passed from client, save it after successful zone retrieval
    if _read_cloudstack_config() is None:
        path = os.environ.get('CLOUDSTACK_CONFIG') or expanduser(join('~', '.cloudstack.ini'))
        with open(path, 'w') as f:
            try:
                f.write(client_config)
            except IOError as e:
                return web.json_response({'error': 'can not save config file'}, status=400)

    return web.json_response(zones)


app = web.Application()
app.router.add_routes(routes)
app.add_routes([web.static('/static', join(PROJECT_ROOT, 'app', 'static'))])
app.add_routes([web.static('/results', join(PROJECT_ROOT, 'configs'))])
web.run_app(app, port=9000)