/* Copyright (c) Citrix Systems, Inc. 
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE.
 */

using System;
using System.Text.RegularExpressions;
using System.Text;
using XenAPI;

namespace XenAdmin.Alerts
{
    public class PolicyAlert : IEquatable<PolicyAlert>
    {
        public readonly string Type;
        public readonly string Text;
        public readonly DateTime Time;
        public readonly int numberOfVMsFailed;

        public const int INFO_PRIORITY = 4;

        public PolicyAlert(long priority, string name, DateTime time, string body, string policyName)
        {
            Type = priority == INFO_PRIORITY ? "info" : "error";
            Time = time;

            if(Type == "info")
            {
                Text = Message.FriendlyBody(name);
                return;
            }

            /* We reach here when message type is an error hence we need 
             * to parse the message body accordingly */

            numberOfVMsFailed = Regex.Matches(body, "VM:").Count;              
            if(numberOfVMsFailed == 0)
            {
                Text = Message.FriendlyBody(name);
                return;
            }

            StringBuilder sb = new StringBuilder();
            sb.AppendFormat(Message.FriendlyBody(name), policyName);
            string[] messageHeader = Regex.Split(body.Replace("\n", " "), "Details:");

             /* get a list of all VMs that have encountered an error */
            string[] vmList = Regex.Split(messageHeader[1], "VM:");

            if(vmList.Length > 1)
            {
                sb.AppendLine();
                sb.AppendLine();
                sb.Append(Messages.VMSS_ALERT_DETAILS);
            }
            /* for each VM entry parse the data and get VM name and corresponding error message */
            for (int i = 1; i < vmList.Length; i++)
            {
                string[] tmp = Regex.Split(vmList[i].Trim(), "Error:");
                string vmName = Regex.Split(tmp[0], "UUID:")[0];
              
                string[] errorCode = Regex.Split(tmp[1].Replace("[", "").Replace("],", "").Replace("]", ""), "\',");
                for (int errorCodeIterator = 0; errorCodeIterator < errorCode.Length; errorCodeIterator++)
                    errorCode[errorCodeIterator] = errorCode[errorCodeIterator].Replace("\'", "").Trim();

                string errorMessage = new Failure(errorCode).Message;
                sb.AppendLine();
                sb.AppendFormat(Messages.VMSS_ALERT_VM_ERROR_FORMAT, i, vmName.Trim(), errorMessage);
            }
            Text = sb.ToString();
        }

        public string ShortFormatBody
        {
            get
            {
                if (Type == "error")
                {
                    if (numberOfVMsFailed == 0)
                    {
                        return Message.FriendlyName(XenAPI.Message.MessageType.VMSS_SNAPSHOT_FAILED.ToString());
                    }
                    else
                    {
                        return string.Format(Messages.VM_SNAPSHOT_SCHEDULE_FAILED,
                            Message.FriendlyName(XenAPI.Message.MessageType.VMSS_SNAPSHOT_FAILED.ToString()),
                            numberOfVMsFailed);
                    }
                }
                return Text;
            }
        }

        #region IEquatable<PolicyAlert> Members

        public bool Equals(PolicyAlert other)
        {
            if (Text != other.Text)
                return false;
            if (Type != other.Type)
                return false;
            if (Time != other.Time)
                return false;
            return true;
        }

        #endregion

    }
}