{ config, lib, pkgs, ... }:

let
  atticHost = "attic.cloonar.com";
  atticPort = 8080; # Internal port for atticd
in {
  # Declare required secrets
  sops.secrets.atticd = {
    # This should contain environment variables for atticd
    # Format: KEY=value per line
    # Required:
    # ATTIC_SERVER_TOKEN_HS256_SECRET=<random-256-bit-secret>
    # Optional:
    # ATTIC_SERVER_DATABASE_URL=postgresql://user:pass@localhost/attic
  };

  # Attic server service
  services.atticd = {
    enable = true;

    # Credentials file from sops
    environmentFile = config.sops.secrets.atticd.path;

    settings = {
      listen = "127.0.0.1:${toString atticPort}";

      # API endpoint configuration
      api-endpoint = "https://${atticHost}/";

      # Require tokens for all operations
      require-proof-of-possession = true;


      # Chunking settings for large uploads
      chunking = {
        nar-size-threshold = 65536;
        min-size = 16384;
        avg-size = 65536;
        max-size = 262144;
      };

      # Garbage collection
      garbage-collection = {
        # GC interval in seconds (12 hours)
        interval = "12 hours";

        # Delete unreferenced chunks after 7 days
        default-retention-period = "6 months";
      };

      # Storage configuration
      storage = {
        # Use local filesystem storage
        type = "local";
        # Store in /var/lib/atticd
        path = "/var/lib/atticd-storage";
      };

      # Optional: S3-compatible storage (commented out)
      # storage = {
      #   type = "s3";
      #   region = "eu-central-1";
      #   bucket = "attic-cache";
      #   endpoint = "https://s3.eu-central-1.amazonaws.com";
      # };

      # Database configuration
      database = {
        # url = "postgresql://atticd@/atticd?host=/run/postgresql";
        url = "postgresql:///atticd?host=/run/postgresql&user=atticd";
      };

      # Compression
      compression = {
        # Use zstd compression
        type = "zstd";
        level = 3; # Balance between speed and compression
      };
    };
  };


  # Create state directory with proper permissions
  # systemd.services.atticd = {
  #   serviceConfig = {
  #     StateDirectory = "atticd";
  #     StateDirectoryMode = "0750";
  #     # Security hardening
  #     PrivateTmp = true;
  #     ProtectSystem = "strict";
  #     ProtectHome = true;
  #     NoNewPrivileges = true;
  #     RestrictNamespaces = true;
  #     RestrictRealtime = true;
  #     RestrictSUIDSGID = true;
  #     LockPersonality = true;
  #     ProtectProc = "invisible";
  #     ProtectClock = true;
  #     ProtectKernelLogs = true;
  #     ProtectControlGroups = true;
  #     ProtectKernelModules = true;
  #     ProtectKernelTunables = true;
  #     ProtectHostname = true;
  #     SystemCallFilter = "@system-service";
  #     SystemCallErrorNumber = "EPERM";
  #     # Resource limits
  #     LimitNOFILE = 65536;
  #   };
  # };

  # Nginx reverse proxy configuration
  services.nginx.virtualHosts."${atticHost}" = {
    enableACME = true;
    forceSSL = true;
    acmeRoot = null;

    locations."/" = {
      proxyPass = "http://127.0.0.1:${toString atticPort}";
      proxyWebsockets = true;

      extraConfig = ''
        # Increase timeouts for large uploads
        proxy_connect_timeout 300;
        proxy_send_timeout 300;
        proxy_read_timeout 300;
        send_timeout 300;

        # Increase body size limit for large NAR uploads (500MB)
        client_max_body_size 500M;
        client_body_buffer_size 128k;

        # Proxy headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # Buffering settings for better performance
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;
        proxy_busy_buffers_size 8k;
        proxy_temp_file_write_size 8k;

        # Cache settings for static content
        proxy_cache_valid 200 302 10m;
        proxy_cache_valid 404 1m;
      '';
    };

    # Health check endpoint
    locations."/health" = {
      proxyPass = "http://127.0.0.1:${toString atticPort}/health";
    };

    # API endpoint with stricter rate limiting
    locations."~ ^/api/" = {
      proxyPass = "http://127.0.0.1:${toString atticPort}";

      extraConfig = ''
        # Rate limiting for API endpoints
        limit_req zone=attic_api burst=10 nodelay;

        # Same proxy settings as above
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        client_max_body_size 500M;
      '';
    };
  };

  # Configure Nginx rate limiting zones
  services.nginx.appendHttpConfig = ''
    # Rate limiting zones for Attic
    limit_req_zone $binary_remote_addr zone=attic_api:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=attic_upload:10m rate=5r/s;

    # Connection limiting
    limit_conn_zone $binary_remote_addr zone=attic_conn:10m;
  '';

  services.postgresql.ensureUsers = [
    {
      name = "atticd";
      ensureDBOwnership = true;
    }
  ];
  services.postgresql.ensureDatabases = [ "atticd" ];
  services.postgresqlBackup.databases = [ "atticd" ];



  services.borgbackup.jobs.default.exclude = [
    "/var/lib/atticd-storage"
  ];

  systemd.tmpfiles.rules = [
    "d /var/lib/atticd-storage 0755 atticd atticd -"
  ];

  environment.systemPackages = [ pkgs.cifs-utils ];
  fileSystems."/var/lib/atticd-storage" = {
    device = "//u149513.your-backup.de/u149513-sub9/";
    fsType = "cifs";
    options = let
      automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.device-timeout=5s,x-systemd.mount-timeout=5s,user,users,file_mode=0770,dir_mode=0770";
      in ["${automount_opts},credentials=${config.sops.secrets.atticd-smb-credentials.path},uid=atticd,gid=atticd"];
  };

  sops.secrets.atticd-smb-credentials = {};

  # Monitoring with Prometheus (if you have it set up)
  # services.prometheus.scrapeConfigs = [{
  #   job_name = "atticd";
  #   static_configs = [{
  #     targets = [ "127.0.0.1:${toString atticPort}" ];
  #   }];
  # }];
}