import datetime
import os
import string
import random

import jinja2
import tldextract

from app import app
from app.extensions import db
from app.models.base import Group
from app.models.mirrors import Origin, Proxy

TEMPLATE = """
terraform {
  required_providers {
    aws = {
      version = "~> 4.4.0"
    }
    fastly = {
      source  = "fastly/fastly"
      version = ">= 1.1.1"
    }
  }
}

provider "aws" {
  access_key = "{{ aws_access_key }}"
  secret_key = "{{ aws_secret_key }}"
  region = "us-east-1"
}

provider "fastly" {
  api_key = "{{ fastly_api_key }}"
}

{% for group in groups %}
module "label_{{ group.id }}" {
  source  = "cloudposse/label/null"
  version = "0.25.0"
  namespace = "bc"
  tenant = "{{ group.group_name }}"
  label_order = ["namespace", "tenant", "name", "attributes"]
}

module "log_bucket_{{ group.id }}" {
  source = "cloudposse/s3-log-storage/aws"
  version = "0.28.0"
  context = module.label_{{ group.id }}.context
  name = "logs"
  attributes = ["fastly"]
  acl                      = "private"
  standard_transition_days = 30
  glacier_transition_days  = 60
  expiration_days          = 90
}

{% if group.id == 3 %}
resource "fastly_service_vcl" "service_{{ group.id }}" {
  name = module.label_{{ group.id }}.id
  
  {% for origin in group.origins %}
  {% for proxy in origin.proxies %}
  {% if proxy.destroyed == None and proxy.provider == "fastly" %}
  domain {
    name    = "{{ proxy.slug }}.global.ssl.fastly.com"
    comment = "Mirror"
  }
  {% endif %}
  {% endfor %}
  
  backend {
    address       = "{{ origin.domain_name }}"
    name          = "{{ origin.description }}"
    port          = 443
    override_host = "{{ origin.domain_name }}"
  }
  {% endfor %}
}
{% endif %}
{% endfor %}
"""


def create_missing_proxies():
    with app.app_context():
        origins = Origin.query.filter(Origin.group_id == 3).all()
        for origin in origins:
            azure_cdn_proxies = [
                x for x in origin.proxies
                if x.provider == "fastly" and x.deprecated is None and x.destroyed is None
            ]
            if not azure_cdn_proxies:
                proxy = Proxy()
                proxy.origin_id = origin.id
                proxy.provider = "fastly"
                proxy.slug = tldextract.extract(origin.domain_name).domain[:5] + ''.join(
                    random.choices(string.ascii_lowercase, k=random.randint(5, 10)))
                proxy.added = datetime.datetime.utcnow()
                proxy.updated = datetime.datetime.utcnow()
                db.session.add(proxy)
        db.session.commit()


def destroy_expired_proxies():
    cutoff = datetime.datetime.utcnow() - datetime.timedelta(days=3)
    proxies = Proxy.query.filter(
        Proxy.destroyed == None,
        Proxy.provider == "fastly",
        Proxy.deprecated < cutoff
    ).all()
    for proxy in proxies:
        proxy.destroyed = datetime.datetime.utcnow()
        proxy.updated = datetime.datetime.utcnow()
    db.session.commit()


def generate_terraform():
    filename = os.path.join(
        app.config['TERRAFORM_DIRECTORY'],
        'fastly',
        'main.tf'
    )
    tmpl = jinja2.Template(TEMPLATE)
    rendered = tmpl.render(
        aws_access_key=app.config['AWS_ACCESS_KEY'],
        aws_secret_key=app.config['AWS_SECRET_KEY'],
        fastly_api_key=app.config['FASTLY_API_KEY'],
        groups=Group.query.all()
    )
    with open(filename, 'w') as out:
        out.write(rendered)


if __name__ == "__main__":
    with app.app_context():
        create_missing_proxies()
        destroy_expired_proxies()
        generate_terraform()