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, flash
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, get_inconsistent_capsuls_information
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():

  # these are always required to display the page anyways, so might as well
  # grab them right off the bat as they are used inside the POST handler as well.

  db_hosts = get_model().list_hosts_with_networks(None)
  db_vms_by_id = get_all_vms_from_db()
  virt_vms_by_id = get_all_vms_from_hosts(db_vms_by_id)

  #current_app.logger.info(f"\n*******************1:\n{pprint.pformat(virt_vms_by_id)}\n\n\n\n")

  network_display_width_px = float(270)
  #operations = get_model().list_all_operations()

  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')}")

    elif request.form['action'] == "set_broadcast_message":
      get_model().set_broadcast_message(request.form['message'])
      current_app.config['BROADCAST_BANNER_MESSAGE'] = request.form['message']
      session.pop('_flashes', None)

      return redirect(f"{url_for('admin.index')}")

    elif request.form['action'] == "start_or_stop":
      if 'id' not in request.form:
        return abort(400, "id is required")
      if 'desired_state' not in request.form:
        return abort(400, "desired_state is required")
      id = request.form['id'] 
      if id not in db_vms_by_id or id not in virt_vms_by_id:
        return abort(404, "vm with that id was not found")

      virt_vm = virt_vms_by_id[id]
      db_vm = db_vms_by_id[id]

      try:
        if request.form['desired_state'] == "running":
          if 'macs' in virt_vm and len(virt_vm['macs'].keys()) > 0:
            current_app.config["HUB_MODEL"].net_set_dhcp(email=session['account'], host_id=virt_vm['host'],  network_name=virt_vm['network_name'], macs=list(virt_vm['macs'].keys()), remove_ipv4=None, add_ipv4=db_vm['public_ipv4'])
            
          current_app.config["HUB_MODEL"].vm_state_command(email=session['account'], id=id, command="start")
        elif request.form['desired_state'] == "shut off":
          current_app.config["HUB_MODEL"].vm_state_command(email=session['account'], id=id, command="force-stop")
        else:
          return abort(400, "desired_state must be either 'running' or 'shut off'")
      except:
        flash(f"""error during start_or_stop of {id}: {my_exec_info_message(sys.exc_info())}""")

      return redirect(f"{url_for('admin.index')}")

    elif request.form['action'] == "dhcp_reset":
      if 'id' not in request.form:
        return abort(400, "id is required")

      id = request.form['id'] 
      if id not in db_vms_by_id or id not in virt_vms_by_id:
        return abort(404, "vm with that id was not found")

      virt_vm = virt_vms_by_id[id]
      db_vm = db_vms_by_id[id]

      try:
        current_app.config["HUB_MODEL"].vm_state_command(email=session['account'], id=id, command="force-stop")
        current_app.config["HUB_MODEL"].net_set_dhcp(email=session['account'], host_id=virt_vm['host'], network_name=virt_vm['network_name'], macs=list(virt_vm['macs'].keys()), remove_ipv4=virt_vm['public_ipv4'], add_ipv4=db_vm['public_ipv4'])
        current_app.config["HUB_MODEL"].vm_state_command(email=session['account'], id=id, command="start")
      except:
        flash(f"""error during dhcp_reset of {id}: {my_exec_info_message(sys.exc_info())}""")
      
      return redirect(f"{url_for('admin.index')}")

    elif request.form['action'] == "stop_and_expire":
      if 'id' not in request.form:
        return abort(400, "id is required")

      id = request.form['id'] 
      if id not in db_vms_by_id or id not in virt_vms_by_id:
        return abort(404, "vm with that id was not found")

      virt_vm = virt_vms_by_id[id]
      #db_vm = db_vms_by_id[id]

      current_app.config["HUB_MODEL"].vm_state_command(email=session['account'], id=id, command="force-stop")
      current_app.config["HUB_MODEL"].net_set_dhcp(email=session['account'], host_id=virt_vm['host'], network_name=virt_vm['network_name'], macs=list(virt_vm['macs'].keys()), add_ipv4=None, remove_ipv4=virt_vm['public_ipv4'])

      return redirect(f"{url_for('admin.index')}")
    
    else:
      return abort(400, "unknown form action")



  # moving on from the form post action stuff... 
  # first create the hosts list w/ ip allocation visualization from the database
  # 

  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]:
          if 'public_ipv4' not in vm or vm['public_ipv4'] is None:
            continue
          
          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)


  inconsistency_info = get_inconsistent_capsuls_information(db_vms_by_id, virt_vms_by_id)


  csp_inline_style_nonce = generate(alphabet="1234567890qwertyuiopasdfghjklzxcvbnm", size=10)
  response_text = render_template(
    "admin.html", 
    csrf_token=session["csrf-token"],
    display_hosts=display_hosts, 
    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=inconsistency_info['in_db_but_not_in_virt'],
    state_not_equal_to_desired_state=inconsistency_info['state_not_equal_to_desired_state'],
    has_no_desired_ip_address=inconsistency_info['has_no_desired_ip_address'],
    has_not_aquired_ip_address_yet=inconsistency_info['has_not_aquired_ip_address_yet'],
    stole_someone_elses_ip_and_own_ip_avaliable=inconsistency_info['stole_someone_elses_ip_and_own_ip_avaliable'],
    stole_someone_elses_ip_but_own_ip_also_stolen=inconsistency_info['stole_someone_elses_ip_but_own_ip_also_stolen'],
    has_wrong_ip=inconsistency_info['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