using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace Console.Waterworks.Core.Specialists
{
    class ProgramInfoSpecialist
    {
        internal List<string> GatherProgramInfomation()
        {
            var info = new List<string>()
            {
                addProductLine(),
                addCompanyLine(),
                addCopyRightLine(),
                addProductDescription()
            };
            return info;
        }

        private string addCopyRightLine()
        {
            var assembly = Assembly.GetEntryAssembly();
            var copyRightAttribute = assembly.GetCustomAttributes<AssemblyCopyrightAttribute>().FirstOrDefault();
            return copyRightAttribute?.Copyright;
        }

        string addProductLine()
        {
            var name = GetProductName();
            var buildInfo = getBuildInfo();
            return (!string.IsNullOrEmpty(name) && !string.IsNullOrEmpty(buildInfo)) ? $"{name} {buildInfo}" : null;
        }

        string addCompanyLine()
        {
            var assembly = Assembly.GetEntryAssembly();
            var companyAttribute = assembly.GetCustomAttributes<AssemblyCompanyAttribute>().FirstOrDefault();
            return companyAttribute?.Company;
        }

        string addProductDescription()
        {
            var assembly = Assembly.GetEntryAssembly();
            var descriptionAttribute = assembly.GetCustomAttributes<AssemblyDescriptionAttribute>().FirstOrDefault();
            return descriptionAttribute?.Description;
        }

        internal string GetProductName()
        {
            var assembly = Assembly.GetEntryAssembly();
            var productAttribute = assembly.GetCustomAttributes<AssemblyProductAttribute>().FirstOrDefault();
            return productAttribute?.Product;
        }

        string getBuildInfo() => Assembly.GetEntryAssembly().GetName().Version.ToString();
    }
}