import { app } from 'electron';

export interface AppMetricsProcessSnapshot {
  pid: number;
  type: string;
  workingSetKb: number | null;
  peakWorkingSetKb: number | null;
  privateBytesKb: number | null;
  creationTime: number | null;
  cpuPercent: number | null;
}

export interface AppMetricsSnapshot {
  collectedAt: number;
  processes: AppMetricsProcessSnapshot[];
}

export function collectAppMetricsSnapshot(): AppMetricsSnapshot {
  return {
    collectedAt: Date.now(),
    processes: app.getAppMetrics().map((metric) => ({
      pid: metric.pid,
      type: metric.type,
      workingSetKb: metric.memory?.workingSetSize ?? null,
      peakWorkingSetKb: readOptionalKilobytes(metric.memory?.peakWorkingSetSize),
      privateBytesKb: readOptionalKilobytes(metric.memory?.privateBytes),
      creationTime: metric.creationTime ?? null,
      cpuPercent: typeof metric.cpu?.percentCPUUsage === 'number'
        ? Math.round(metric.cpu.percentCPUUsage * 10) / 10
        : null
    }))
  };
}

function readOptionalKilobytes(value: number | undefined): number | null {
  return typeof value === 'number' && value >= 0 ? value : null;
}