using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.Logging
{
    /// <summary>
    /// Represents a base class for log items.
    /// </summary>
    public abstract class LogItemBase
    {
        private static String base_path;

        /// <summary>
        /// Gets or sets the assembly.
        /// </summary>
        public String CallerAssembly { get; set; }

        /// <summary>
        /// Gets or sets the caller method adding the exception.
        /// </summary>
        public String CallerMethodName { get; set; }

        /// <summary>
        /// Gets or sets the caller file.
        /// </summary>
        public String CallerFile { get; set; }

        /// <summary>
        /// Gets the relative caller file.
        /// </summary>
        public String RelativeCallerFile
        {
            get { return GetRelativeCallerFilePath(); }
        }

        /// <summary>
        /// Gets or sets the caller line number.
        /// </summary>
        public int CallerLineNumber { get; set; }

        /// <summary>
        /// Gets or sets the DateTime for the log.
        /// </summary>
        public DateTime TimeStamp { get; set; }

        /// <summary>
        /// Gets or sets the log category.
        /// </summary>
        public LogCategory Category { get; set; }

        /// <summary>
        /// Gets the log message.
        /// </summary>
        public abstract String Message { get; set; }

        /// <summary>
        /// Returns a formatted string of the log item.
        /// </summary>
        public abstract override String ToString();

        /// <summary>
        /// Gets the relative caller file path.
        /// </summary>
        /// <returns></returns>
        protected String GetRelativeCallerFilePath()
        {
            if (base_path == null)
            {
                int index = CallerFile.IndexOf("Visual_Studio") + "Visual_Studio".Length + 1;
                String relative = CallerFile.Substring(index, CallerFile.Length - index);
                base_path = CallerFile.Replace(relative, "");
            }

            if (Path.IsPathRooted(CallerFile))
            {
                return CallerFile.Remove(0, base_path.Length);
            }
            else
            {
                return CallerFile;
            }
        }
    }
}