using System;
using System.IO;
using System.Linq;

namespace Win_in.Sfs.Auth
{
    /// <summary>
    /// This class is used to find root path of the web project. Used for;
    /// 1. unit tests (to find views).
    /// 2. entity framework core command line commands (to find the conn string).
    /// </summary>
    public static class WebContentDirectoryFinder
    {
        public static string CalculateContentRootFolder()
        {
            var domainAssemblyDirectoryPath =
                Path.GetDirectoryName(typeof(AuthDomainModule).Assembly.Location);
            if (domainAssemblyDirectoryPath == null)
            {
                throw new Exception(
                    $"Could not find location of {typeof(AuthDomainModule).Assembly.FullName} assembly!");
            }

            var directoryInfo = new DirectoryInfo(domainAssemblyDirectoryPath);

            if (Environment.GetEnvironmentVariable("NCrunch") == "1")
            {
                while (!DirectoryContains(directoryInfo.FullName, "Win_in.Sfs.Auth.Web.csproj", SearchOption.AllDirectories))
                {
                    directoryInfo = directoryInfo.Parent ?? throw new Exception("Could not find content root folder!");
                }

                var webProject = Directory.GetFiles(directoryInfo.FullName, string.Empty, SearchOption.AllDirectories)
                    .First(filePath => string.Equals(Path.GetFileName(filePath), "Win_in.Sfs.Auth.Web.csproj"));

                return Path.GetDirectoryName(webProject);
            }

            while (!DirectoryContains(directoryInfo.FullName, "Win_in.Sfs.Auth.sln"))
            {
                directoryInfo = directoryInfo.Parent ?? throw new Exception("Could not find content root folder!");
            }

            var webFolder = Path.Combine(directoryInfo.FullName, $"src{Path.DirectorySeparatorChar}Win_in.Sfs.Auth.Web");
            if (Directory.Exists(webFolder))
            {
                return webFolder;
            }

            throw new Exception("Could not find root folder of the web project!");
        }

        private static bool DirectoryContains(string directory, string fileName,
            SearchOption searchOption = SearchOption.TopDirectoryOnly)
        {
            return Directory.GetFiles(directory, string.Empty, searchOption)
                .Any(filePath => string.Equals(Path.GetFileName(filePath), fileName));
        }
    }
}