using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;

namespace Microsoft.SelfService.Portal.Core.API.Context
{
    public class DataContextFactory : IDesignTimeDbContextFactory<DataContext>
    {
        public DataContext CreateDbContext(string[] args)
        {
            var basePath = ResolveBasePath();
            var configuration = new ConfigurationBuilder()
                .SetBasePath(basePath)
                .AddJsonFile("appsettings.json", optional: false)
                .AddJsonFile("appsettings.Development.json", optional: true)
                .AddEnvironmentVariables()
                .Build();

            var connectionString = configuration.GetConnectionString("Context")
                ?? throw new InvalidOperationException("Connection string 'Context' not found.");

            var optionsBuilder = new DbContextOptionsBuilder<DataContext>();
            optionsBuilder.UseSqlServer(connectionString);

            return new DataContext(optionsBuilder.Options);
        }

        private static string ResolveBasePath()
        {
            var currentDirectory = Directory.GetCurrentDirectory();
            var projectDirectory = Path.Combine(
                currentDirectory,
                ".Net",
                "Microsoft.SelfService.Portal.Core.API");

            if (File.Exists(Path.Combine(currentDirectory, "appsettings.json")))
            {
                return currentDirectory;
            }

            if (File.Exists(Path.Combine(projectDirectory, "appsettings.json")))
            {
                return projectDirectory;
            }

            var assemblyDirectory = AppContext.BaseDirectory;
            if (File.Exists(Path.Combine(assemblyDirectory, "appsettings.json")))
            {
                return assemblyDirectory;
            }

            return currentDirectory;
        }
    }
}