using GreenTree.Nachtragsmanagement.Core;
using GreenTree.Nachtragsmanagement.Core.Data;
using GreenTree.Nachtragsmanagement.Core.Domain.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GreenTree.Nachtragsmanagement.Services.Logging
{
    /// <summary>
    /// Default logger
    /// </summary>
    public partial class DefaultLogger : ILogger
    {
        #region Fields

        private readonly IRepository<Log> _logRepository;
        private readonly IWebHelper _webHelper;

        #endregion

        #region Ctor

        /// <summary>
        /// Initializes a new instance of the DefaultLogger class
        /// </summary>
        public DefaultLogger(
            IRepository<Log> logRepository,
            IWebHelper webHelper)
        {
            this._logRepository = logRepository;
            this._webHelper = webHelper;
        }

        #endregion

        #region Methods

        /// <summary>
        /// Determines whether a log level is enabled
        /// </summary>
        /// <param name="level">Log level</param>
        /// <returns>Result</returns>
        public virtual bool IsEnabled(LogLevel level)
        {
            switch (level)
            {
                case LogLevel.Debug:
                    return false;
                default:
                    return true;
            }
        }

        /// <summary>
        /// Deletes a log item
        /// </summary>
        /// <param name="log">Log item</param>
        public virtual void DeleteLog(Log log)
        {
            if (log == null)
                throw new ArgumentNullException("log");

            _logRepository.Delete(log);
        }

        /// <summary>
        /// Clears a log
        /// </summary>
        public virtual void ClearLog()
        {
            var logs = _logRepository.Table.ToList();

            foreach (var logItem in logs)
                _logRepository.Delete(logItem);
        }

        /// <summary>
        /// Gets all log items
        /// </summary>
        /// <returns>Log item collection</returns>
        public IList<Log> GetAllLogs()
        {
            return _logRepository.Table.ToList();
        }

        /// <summary>
        /// Gets a log item
        /// </summary>
        /// <param name="logId">Log item identifier</param>
        /// <returns>Log item</returns>
        public virtual Log GetLogById(int logId)
        {
            if (logId == 0)
                return null;

            return _logRepository.GetById(logId);
        }

        /// <summary>
        /// Get log items by identifiers
        /// </summary>
        /// <param name="logIds">Log item identifiers</param>
        /// <returns>Log items</returns>
        public virtual IList<Log> GetLogByIds(int[] logIds)
        {
            if (logIds == null || logIds.Length == 0)
                return new List<Log>();

            var query = from l in _logRepository.Table
                        where logIds.Contains(l.Id)
                        select l;
            var logItems = query.ToList();
            //sort by passed identifiers
            var sortedLogItems = new List<Log>();
            foreach (int id in logIds)
            {
                var log = logItems.Find(x => x.Id == id);
                if (log != null)
                    sortedLogItems.Add(log);
            }
            return sortedLogItems;
        }

        /// <summary>
        /// Inserts a log item
        /// </summary>
        /// <param name="logLevel">Log level</param>
        /// <param name="entity"></param>
        /// <param name="shortMessage">The short message</param>
        /// <param name="fullMessage">The full message</param>
        /// <param name="user">The user to associate log record with</param>
        /// <returns>A log item</returns>
        public virtual Log InsertLog(LogLevel logLevel, string shortMessage, BaseEntity entity = null, string fullMessage = "", 
            Core.Domain.User.User user = null)
        {
            var log = new Log
            {
                LogLevel = logLevel,
                ShortMessage = shortMessage,
                FullMessage = fullMessage,
                IpAddress = _webHelper.GetCurrentIpAddress(),
                UserId = user == null
                    ? null
                    : (int?)user.Id,
                EntityId = entity == null 
                    ? null
                    : (int?)entity.Id,
                EntityType = entity == null
                    ? null
                    : LoggingExtensions.GetTypeNameFromEfEntityType(entity),
                PageUrl = _webHelper.GetThisPageUrl(true),
                ReferrerUrl = _webHelper.GetUrlReferrer(),
                CreatedOnUtc = DateTime.UtcNow
            };

            _logRepository.Insert(log);

            return log;
        }

        #endregion
    }
}