Nexus.Reader/src/NexusReader.Data/Persistence/AppDbContextFactory.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;
using Pgvector.EntityFrameworkCore;

namespace NexusReader.Data.Persistence;

public class AppDbContextFactory : IDesignTimeDbContextFactory<AppDbContext>
{
    public AppDbContext CreateDbContext(string[] args)
    {
        var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Development";
        
        // Try to find the Web project directory by looking for the solution root
        var currentDir = new DirectoryInfo(Directory.GetCurrentDirectory());
        while (currentDir != null && !File.Exists(Path.Combine(currentDir.FullName, "NexusReader.slnx")))
        {
            currentDir = currentDir.Parent;
        }

        var basePath = currentDir != null 
            ? Path.Combine(currentDir.FullName, "src", "NexusReader.Web")
            : Directory.GetCurrentDirectory();

        var configuration = new ConfigurationBuilder()
            .SetBasePath(basePath)
            .AddJsonFile("appsettings.json", optional: true)
            .AddJsonFile($"appsettings.{environment}.json", optional: true)
            .AddEnvironmentVariables()
            .Build();

        var optionsBuilder = new DbContextOptionsBuilder<AppDbContext>();
        var connectionString = configuration.GetConnectionString("PostgresConnection");

        if (string.IsNullOrEmpty(connectionString))
        {
             // For design time, if no PG connection is found, we might be using Sqlite or just testing
             connectionString = "Host=localhost;Database=nexus_reader;Username=postgres;Password=postgres";
        }

        optionsBuilder.UseNpgsql(connectionString, x => x.UseVector());

        return new AppDbContext(optionsBuilder.Options);
    }
}