import re
import sys
import json
import ipaddress
from datetime import datetime, timedelta
from flask import Blueprint, current_app, render_template, make_response, session, request, redirect, url_for
from flask_mail import Message
from werkzeug.exceptions import abort
from nanoid import generate

from capsulflask.metrics import durations as metric_durations
from capsulflask.auth import admin_account_required
from capsulflask.db import get_model
from capsulflask.shared import my_exec_info_message

bp = Blueprint("admin", __name__, url_prefix="/admin")

@bp.route("/", methods=("GET", "POST"))
@admin_account_required
def index():

  if request.method == "POST":
    if "csrf-token" not in request.form or request.form['csrf-token'] != session['csrf-token']:
      return abort(418, f"u want tea")

    if 'action' not in request.form:
      return abort(400, "action is required")

    if request.form['action'] == "megaphone":
      emails_list = get_model().all_accounts_with_active_vms()
      current_app.logger.info(f"sending '{request.form['subject']}' email to {len(emails_list)} users...")
      # for email in emails_list:
      #   current_app.logger.info(email)

      suffix1 = "This email was sent by the Capsul Admin Megaphone."
      suffix2 = "If you have any questions DO NOT REPLY TO THIS EMAIL, direct your inquiry to support@cyberia.club"

      current_app.config["FLASK_MAIL_INSTANCE"].send(
        Message(
          request.form['subject'],
          sender=current_app.config["MAIL_DEFAULT_SENDER"],
          body=f"{request.form['body']}\n\n{suffix1}\n{suffix2}",
          bcc=emails_list,
        )
      )
      current_app.logger.info(f"sending email is done.")
      return redirect(f"{url_for('admin.index')}")
    else:
      return abort(400, "unknown form action")


  # first create the hosts list w/ ip allocation visualization from the database
  # 
   
  db_hosts = get_model().list_hosts_with_networks(None)
  db_vms_by_host_and_network = get_model().non_deleted_vms_by_host_and_network(None)
  network_display_width_px = float(270)
  #operations = get_model().list_all_operations()

  display_hosts = []
  inline_styles = [f"""
  .network-display {'{'}
    width: {network_display_width_px}px;
  {'}'}
  """]

  db_vm_by_id = dict()

  for kv in db_hosts.items():
    host_id = kv[0]
    value = kv[1]
    display_host = dict(name=host_id, networks=value['networks'])

    for network in display_host['networks']:

      network_start_int = int(ipaddress.ip_address(network["public_ipv4_first_usable_ip"]))
      network_end_int = int(ipaddress.ip_address(network["public_ipv4_last_usable_ip"]))

      network['allocations'] = []
      network_addresses_width = float((network_end_int-network_start_int)+1)

      if host_id in db_vms_by_host_and_network:
        if network['network_name'] in db_vms_by_host_and_network[host_id]:
          for vm in db_vms_by_host_and_network[host_id][network['network_name']]:
            vm['network_name'] = network['network_name']
            vm['virtual_bridge_name'] = network['virtual_bridge_name']
            vm['host'] = host_id
            db_vm_by_id[vm['id']] = vm
            ip_address_int = int(ipaddress.ip_address(vm['public_ipv4']))
            if network_start_int <= ip_address_int and ip_address_int <= network_end_int:
              allocation = f"{host_id}_{network['network_name']}_{len(network['allocations'])}"
              inline_styles.append(
                f"""
                .{allocation} {'{'}
                  left: {(float(ip_address_int-network_start_int)/network_addresses_width)*network_display_width_px}px; 
                  width: {network_display_width_px/network_addresses_width}px;
                {'}'}
                """
              )
              network['allocations'].append(allocation)
            else:
              current_app.logger.warning(f"/admin: capsul {vm['id']} has public_ipv4 {vm['public_ipv4']} which is out of range for its host network {host_id} {network['network_name']} {network['public_ipv4_cidr_block']}")

    display_hosts.append(display_host)


  # Now creating the capsuls running status ui
  # 

  virt_vms_by_host_and_network = current_app.config["HUB_MODEL"].get_all_by_host_and_network()

  # virt_vms_dict = dict()
  # for vm in virt_vms:
  #   virt_vms_dict[vm["id"]] = vm["state"]
  
  # in_db_but_not_in_virt = []
  # needs_to_be_started = []
  # needs_to_be_started_missing_ipv4 = []

  # for vm in db_vms:
  #   if vm["id"] not in virt_vms_dict:
  #     in_db_but_not_in_virt.append(vm["id"])
  #   elif vm["desired_state"] == "running" and virt_vms_dict[vm["id"]] != "running":
  #     if vm["id"] in db_vm_by_id:
  #       needs_to_be_started.append(db_vm_by_id[vm["id"]])
  #     else:
  #       needs_to_be_started_missing_ipv4.append(vm["id"])
  #   elif vm["ipv4"] != current_ipv4

  # current_app.logger.info(f"list_of_networks: {json.dumps(list_of_networks)}")


  csp_inline_style_nonce = generate(alphabet="1234567890qwertyuiopasdfghjklzxcvbnm", size=10)
  response_text = render_template(
    "admin.html", 
    csrf_token=session["csrf-token"],
    display_hosts=display_hosts, 
    # in_db_but_not_in_virt=in_db_but_not_in_virt,
    # needs_to_be_started=needs_to_be_started,
    # needs_to_be_started_missing_ipv4=needs_to_be_started_missing_ipv4,
    network_display_width_px=network_display_width_px,
    csp_inline_style_nonce=csp_inline_style_nonce,
    inline_style='\n'.join(inline_styles),

    db_vms_by_host_and_network=json.dumps(db_vms_by_host_and_network),
    virt_vms_by_host_and_network=json.dumps(virt_vms_by_host_and_network),
  )

  response = make_response(response_text)

  response.headers.set('Content-Type', 'text/html')
  response.headers.set('Content-Security-Policy', f"default-src 'self'; style-src 'self' 'nonce-{csp_inline_style_nonce}'")

  return response