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

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

        private string addCopyRightLine()
        {
            Assembly assembly = Assembly.GetEntryAssembly();
            var copyRightAttribute = assembly
                .GetCustomAttributes(typeof(AssemblyCopyrightAttribute), false)
                .OfType<AssemblyCopyrightAttribute>()
                .FirstOrDefault();
            return (copyRightAttribute != null) ? copyRightAttribute.Copyright : null;
        }

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

        string addCompanyLine()
        {
            Assembly assembly = Assembly.GetEntryAssembly();
            var companyAttribute = assembly
                .GetCustomAttributes(typeof(AssemblyCompanyAttribute), false)
                .OfType<AssemblyCompanyAttribute>()
                .FirstOrDefault();
            return (companyAttribute != null) ? companyAttribute.Company : null;
        }

        string addProductDescription()
        {
            Assembly assembly = Assembly.GetEntryAssembly();
            var descriptionAttribute = assembly
                .GetCustomAttributes(typeof(AssemblyDescriptionAttribute), false)
                .OfType<AssemblyDescriptionAttribute>()
                .FirstOrDefault();
            return (descriptionAttribute != null) ? descriptionAttribute.Description : null;
        }

        internal string GetProductName()
        {
            Assembly assembly = Assembly.GetEntryAssembly();
            var productAttribute = assembly
                .GetCustomAttributes(typeof(AssemblyProductAttribute), false)
                .OfType<AssemblyProductAttribute>()
                .FirstOrDefault();
            return (productAttribute != null) ? productAttribute.Product : null;
        }

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