import asyncio
import concurrent.futures
import json
import os
import sys
from os.path import join, dirname, expanduser

import yaml
from aiohttp import web, ClientSession

from playbook import PlaybookCLI

try:
    import boto3
    HAS_BOTO3 = True
except ImportError:
    HAS_BOTO3 = 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

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


def run_playbook(data):
    global task_program
    extra_vars = ' '.join(['{0}={1}'.format(key, data[key])
                           for key in data.keys()])
    task_program = ['ansible-playbook', 'main.yml', '--extra-vars', extra_vars]
    return PlaybookCLI(task_program).run()


@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(request):
    if not task_future:
        return web.json_response({'status': None})

    if task_future.done():
        try:
            return web.json_response({'status': 'done', 'program': task_program, 'result': task_future.result()})
        except ValueError as e:
            return web.json_response({'status': 'error', 'program': task_program, 'result': str(e)})
    elif task_future.cancelled():
        return web.json_response({'status': 'cancelled', 'program': task_program})
    else:
        return web.json_response({'status': 'running', 'program': task_program})


@routes.post('/playbook')
async def playbook_post_handler(request):
    global task_future
    global pool
    data = await request.json()
    loop = asyncio.get_running_loop()

    pool = concurrent.futures.ThreadPoolExecutor()
    task_future = loop.run_in_executor(pool, run_playbook, data)
    return web.json_response({'ok': True})


@routes.delete('/playbook')
async def playbook_delete_handler(_):
    global task_future
    if not task_future:
        return web.json_response({'ok': False})

    cancelled = task_future.cancel()
    pool.shutdown(wait=False)
    task_future = None
    return web.json_response({'ok': cancelled})


@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({"ok": 'DO_API_TOKEN' in os.environ})


@routes.get('/do_regions')
async def do_regions(request):
    if 'token' in request.query:
        token = request.query['token']
    elif 'DO_API_TOKEN' in os.environ:
        token = os.environ['DO_API_TOKEN']
    else:
        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.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(_):
    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):
    default_path = expanduser(join('~', '.vultr.ini'))
    response = {'path': None}
    try:
        open(default_path, 'r').read()
        response['path'] = default_path
    except IOError:
        pass

    if 'VULTR_API_CONFIG' in os.environ:
        try:
            open(os.environ['VULTR_API_CONFIG'], 'r').read()
            response['path'] = os.environ['VULTR_API_CONFIG']
        except IOError:
            pass
    return web.json_response(response)


@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({"ok": 'SCW_TOKEN' in os.environ})


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)