import { buildHealthTimeline, summarizeTimelineForAssess } from './health-timeline.mjs';
import { computeHealthBaselines } from './health-baseline-engine.mjs';
import { evaluateHealthEvents } from './health-event-engine.mjs';

export function buildHealthAssessSummary(observations = [], { now = Date.now() } = {}) {
  const timeline = buildHealthTimeline(observations);
  const baselines = computeHealthBaselines(observations, { now });
  const events = evaluateHealthEvents(observations, baselines, { now, mode: 'active' });
  const lines = [summarizeTimelineForAssess(timeline)];

  const stableBaselines = baselines.filter(
    (b) => b.windowDays === 30 && b.maturity === 'stable' && b.mean != null,
  );
  if (stableBaselines.length > 0) {
    lines.push('', '30 天基线（已成熟）:');
    for (const base of stableBaselines.slice(0, 6)) {
      lines.push(`- ${base.metricType} (${base.context}): 均值 ${base.mean}`);
    }
  }

  const openEvents = events.filter((e) => e.severity === 'watch' || e.severity === 'alert');
  if (openEvents.length > 0) {
    lines.push('', '需要留意的信号:');
    for (const event of openEvents.slice(0, 5)) {
      lines.push(`- [${event.severity}] ${event.message}`);
    }
  } else if (stableBaselines.length > 0) {
    lines.push('', '当前未检测到需要立即留意的规则事件。');
  }

  return lines.join('\n');
}