using System.Text;
using DashCaddy.Desktop.Models;

namespace DashCaddy.Desktop.Services;

public class CaddyConfigGenerator
{
    private const string CaddyfilePath = @"E:\dockerdata\dashcaddy\caddy\Caddyfile";

    public void RegenerateConfig(List<ServiceModel> services)
    {
        var sb = new StringBuilder();
        
        // Global options
        sb.AppendLine("{");
        sb.AppendLine("    admin :2019");
        sb.AppendLine("    email admin@example.com");
        sb.AppendLine("}");
        sb.AppendLine();

        // Each service gets a site block
        foreach (var svc in services.Where(s => s.Health != "unhealthy"))
        {
            var domain = ExtractDomain(svc.Url);
            if (string.IsNullOrEmpty(domain)) continue;

            sb.AppendLine($"{domain} {{");
            sb.AppendLine($"    reverse_proxy {svc.Host}:{svc.Port}");
            sb.AppendLine("    tls internal");
            sb.AppendLine("}");
            sb.AppendLine();
        }

        File.WriteAllText(CaddyfilePath, sb.ToString());
    }

    public async Task ReloadCaddyAsync()
    {
        // Call Caddy admin API to reload config
        using var http = new HttpClient();
        await http.PostAsync("http://localhost:2019/load", 
            new StringContent(File.ReadAllText(CaddyfilePath), Encoding.UTF8, "text/caddyfile"));
    }

    private string ExtractDomain(string url)
    {
        try
        {
            var uri = new Uri(url);
            return uri.Host;
        }
        catch
        {
            return null;
        }
    }
}