using System;
using CommandLine;
using CommandLine.Text;
using Deltares.Standard;
using Deltares.Standard.Reflection;

namespace Deltares.Dam.KernelComparisonRunner
{
    internal class CommandOptions : CommandLineOptionsBase
    {
        public const string DefaultKernelSpecificationFileName = "";
        public const string DefaultLocationsFileName = "";
        public const string DefaultOutputPath = @"Report\";

        [Option("d", "DamxFile", Required = true, HelpText = "Name and path of the input DAMX file")]
        public string DamXFileName { get; set; }

        [Option("k", "KernelSpecificationFileName", Required = false, DefaultValue = DefaultKernelSpecificationFileName, 
            HelpText = "Name and path of the file with the kernels to calculate (DamClassic, DamClassicDotNet, DamClassicWti, AdvancedDotNet, AdvancedWti)")]
        public string KernelSpecificationFileName { get; set; }

        [Option("l", "LocationsFileName", Required = false, DefaultValue = DefaultLocationsFileName, HelpText = "Name and path of file with the locations to calculate")]
        public string LocationsFileName { get; set; }

        [Option("o", "OutputPath", Required = false, DefaultValue = DefaultOutputPath, HelpText = "Path where to output the reports")]
        public string OutputPath { get; set; }


        readonly AssemblyInfoHelper assemblyInfoHelper = new AssemblyInfoHelper(typeof(Program));

        /// <summary>
        /// Gets the assemblyInfoHelper.
        /// </summary>
        /// <value>
        /// The this assembly.
        /// </value>
        private AssemblyInfoHelper ThisAssembly
        {
            get
            {
                return assemblyInfoHelper;
            }
        }

        /// <summary>
        /// Gets the help info.
        /// </summary>
        /// <returns></returns>
        [HelpOption]
        public string GetUsage()
        {
            var help = new HelpText
            {
                Heading = new HeadingInfo(ThisAssembly.Title, ThisAssembly.AssemblyVersion),
                Copyright = new CopyrightInfo(ThisAssembly.Company, 2012),
                AdditionalNewLineAfterOption = true,
                AddDashesToOption = true
            };

            this.HandleParsingErrorsInHelp(help);

            //help.AddPreOptionsLine("<<license details here.>>");
            help.AddPreOptionsLine("Usage: KernelComparisonRunner[.exe] -d DamxFile [-k KernelSpecificationFileName]  [-l LocationsFileName]  [-o OutputPath] ");
            help.AddOptions(this);

            return help;
        }

        /// <summary>
        /// Handles the parsing errors in help.
        /// </summary>
        /// <param name="help">The help.</param>
        void HandleParsingErrorsInHelp(HelpText help)
        {
            if (this.LastPostParsingState.Errors.Count > 0)
            {
                var errors = help.RenderParsingErrorsText(this, 2); // indent with two spaces					
                if (!string.IsNullOrEmpty(errors))
                {
                    help.AddPreOptionsLine(string.Concat(Environment.NewLine, "ERROR(S):"));
                    help.AddPreOptionsLine(errors);
                }
            }
        }

    }
}