import re
import sys
import json
import ipaddress
import pprint
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.consistency import get_all_vms_from_db, get_all_vms_from_hosts
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")

  # moving on from the form post stuff... 

  # first create the hosts list w/ ip allocation visualization from the database
  # 
   
  db_hosts = get_model().list_hosts_with_networks(None)
  db_vms_by_id = get_all_vms_from_db()
  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_vms_by_host_network = dict()
  for vm in db_vms_by_id.values():
    host_network_key = f"{vm['host']}_{vm['network_name']}" 
    if host_network_key not in db_vms_by_host_network:
      db_vms_by_host_network[host_network_key] = []
    db_vms_by_host_network[host_network_key].append(vm)


  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)

      host_network_key = f"{host_id}_{network['network_name']}" 
      if host_network_key in db_vms_by_host_network:
        for vm in db_vms_by_host_network[host_network_key]:
          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 capsul consistency / running status ui
  # 

  virt_vms_by_id = get_all_vms_from_hosts()
  
  # current_app.logger.info(pprint.pformat(db_vms_by_id))

  # current_app.logger.info("\n\n\n\n")

  # current_app.logger.info(pprint.pformat(virt_vms_by_id))

  # current_app.logger.info("\n\n\n\n")

  virt_vm_id_by_ipv4 = dict()
  for vm_id, virt_vm in virt_vms_by_id.items():
    if 'public_ipv4' in virt_vm and virt_vm['public_ipv4'] != "":
      virt_vm_id_by_ipv4[virt_vm['public_ipv4']] = vm_id

  db_vm_id_by_ipv4 = dict()
  for vm_id, db_vm in db_vms_by_id.items():
    if 'public_ipv4' in db_vm and db_vm['public_ipv4'] != "":
      db_vm_id_by_ipv4[db_vm['public_ipv4']] = vm_id

  in_db_but_not_in_virt = []
  state_not_equal_to_desired_state = []
  has_no_desired_ip_address = []
  has_not_aquired_ip_address_yet = []
  stole_someone_elses_ip_and_own_ip_avaliable = []
  stole_someone_elses_ip_but_own_ip_also_stolen = []
  has_wrong_ip = []

  for vm_id, db_vm in db_vms_by_id.items():
    if vm_id not in virt_vms_by_id:
      in_db_but_not_in_virt.append(db_vm)
    elif virt_vms_by_id[vm_id]['state'] != db_vm["desired_state"]:
      db_vm["state"] = virt_vms_by_id[vm_id]['state']
      state_not_equal_to_desired_state.append(db_vm)
    elif 'public_ipv4' not in db_vm or db_vm["public_ipv4"] == "":
      has_no_desired_ip_address.append(db_vm)
    elif db_vm["desired_state"] == "running" and 'public_ipv4' not in virt_vms_by_id[vm_id] or virt_vms_by_id[vm_id]['public_ipv4'] == "":
      has_not_aquired_ip_address_yet.append(db_vm)
    elif db_vm["desired_state"] == "running" and virt_vms_by_id[vm_id]['public_ipv4'] != db_vm["public_ipv4"]:
      db_vm["desired_ipv4"] = db_vm["public_ipv4"]
      db_vm["current_ipv4"] = virt_vms_by_id[vm_id]['public_ipv4']
      if virt_vms_by_id[vm_id]['public_ipv4'] in db_vm_id_by_ipv4:
        if db_vm["public_ipv4"] not in virt_vm_id_by_ipv4:
          stole_someone_elses_ip_and_own_ip_avaliable.append(db_vm)
        else:
          stole_someone_elses_ip_but_own_ip_also_stolen.append(db_vm)
      
      has_wrong_ip.append(db_vm)


  # 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),
    in_db_but_not_in_virt=in_db_but_not_in_virt,
    state_not_equal_to_desired_state=state_not_equal_to_desired_state,
    has_no_desired_ip_address=has_no_desired_ip_address,
    has_not_aquired_ip_address_yet=has_not_aquired_ip_address_yet,
    stole_someone_elses_ip_and_own_ip_avaliable=stole_someone_elses_ip_and_own_ip_avaliable,
    stole_someone_elses_ip_but_own_ip_also_stolen=stole_someone_elses_ip_but_own_ip_also_stolen,
    has_wrong_ip=has_wrong_ip
  )

  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