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

    options.services.node-exporter = {
        enable = mkEnableOption "Enable the prometheus node_exporter";
        listen = mkOption {
            description = "[host]:port to listen on for the node_exporter";
            default = "localhost:9100";
            defaultText = "localhost:9100";
        };
    };
   
    options.services.heracles = {
        enable = mkEnableOption "Enable the heracles server";
        listen = mkOption {
            description = "[host]:port to listen on for the heracles server";
            default = "localhost:9001";
            defaultText = "localhost:9001";
        };
        settings = mkOption {
            description = "Settings for the heracles dashboards";
            default = [];
            defaultText = "[]";
        };
    };

    options.services.prometheus = {
        enable = lib.mkEnableOption "Enable the prometheus server";
        listen = mkOption {
            description = "[host]:port to listen on for the prometheus server";
            default = "localhost:9000";
            defaultText = "localhost:9000";
        };
        settings = mkOption {
            description = "The yaml configuration file settings for prometheus";
            default = {
                scrape_configs = [
                    {
                        job_name = "node_exporter";
                        scrape_interval = "30s";
                        metrics_path = "/metrics";
                        static_configs = [
                            {
                                targets = [
                                    "${config.services.node-exporter.listen}"
                                ];
                            }
                        ];
                    }
                ];
            };
            defaultText = ''{
                scrape_configs = [
                    {
                        job_name = "nodestats";
                        scrape_interval = "30s";
                        metrics_path = "/metrics";
                        static_configs = [
                            {
                                targets = [
                                    "${config.services.node-exporter.listen}"
                                ];
                            }
                        ];
                    }
                ];
            }'';
        };
        dataPath = mkOption {
            description = "Storage path for the tsdb";
            default = "/Users/zaphar/opt/prometheus";
            defaultText = "~/opt/prometheus";
        };
    };

    
    config = {
        launchd.user.agents.node-exporter = mkIf config.services.node-exporter.enable {
            serviceConfig = {
                ProgramArguments = [
                    "${pkgs.prometheus-node-exporter}/bin/node_exporter"
                    "--web.listen-address=${config.services.node-exporter.listen}"
                ];
                KeepAlive = true;
                RunAtLoad = true;
            };
        };
        
        environment.etc."prometheus.yaml" = mkIf config.services.prometheus.enable {
            text = (generators.toYAML {} config.services.prometheus.settings);
        };
        
        environment.etc."heracles.yaml" = mkIf config.services.heracles.enable {
            text = (generators.toYAML {} config.services.heracles.settings);
        };
       
        launchd.user.agents.heracles = mkIf config.services.heracles.enable {
            serviceConfig = {
                ProgramArguments = [
                    "${pkgs.heracles}/bin/heracles"
                    "--listen=${config.services.heracles.listen}"
                    "--config=/etc/${config.environment.etc."heracles.yaml".target}"
                ];
                KeepAlive = true;
                RunAtLoad = true;
            };
        };
        
        launchd.user.agents.prometheus = mkIf config.services.prometheus.enable {
            serviceConfig = {
                ProgramArguments = [
                    "${pkgs.prometheus}/bin/prometheus"
                    "--web.listen-address=${config.services.prometheus.listen}"
                    "--config.file=/etc/${config.environment.etc."prometheus.yaml".target}"
                    #"--storage.tsdb.path=${config.services.prometheus.dataPath}"
                ];
                StandardOutPath = "${config.services.prometheus.dataPath}/prometheus-out.log";
                StandardErrorPath = "${config.services.prometheus.dataPath}/prometheus-err.log";
                WorkingDirectory=config.services.prometheus.dataPath;
                KeepAlive = true;
                RunAtLoad = true;
            };
        };
    };

}