import { buildHealthAssessSummary } from './health-assess-summary.mjs';
import { buildHealthTimeline } from './health-timeline.mjs';
import { computeHealthBaselines } from './health-baseline-engine.mjs';
import { evaluateHealthEvents } from './health-event-engine.mjs';

export function buildHealthAgentContext(
  observations = [],
  { now = Date.now(), limitDays = 30, documents = [] } = {},
) {
  const timeline = buildHealthTimeline(observations, { limitDays });
  const baselines = computeHealthBaselines(observations, { now });
  const events = evaluateHealthEvents(observations, baselines, { now, mode: 'active' });
  const summary = buildHealthAssessSummary(observations, { now });

  const lines = [
    '【本人健康档案摘要 — 仅供 health-assistant 解释，勿当作诊断】',
    summary,
  ];

  if (timeline.length >= 2) {
    lines.push('', '【近几日记录摘要】');
    for (const day of timeline.slice(0, 7)) {
      const metricText = Object.values(day.metrics)
        .map((item) => `${item.label} ${item.value}`)
        .join('；');
      lines.push(`- ${day.date}: ${metricText || '无结构化读数'}`);
    }
  }

  const openEvents = events.filter((e) => e.severity === 'watch' || e.severity === 'alert');
  if (openEvents.length > 0) {
    lines.push('', '【开放事件】');
    for (const event of openEvents.slice(0, 5)) {
      lines.push(`- ${event.message}`);
    }
  }

  const docRows = Array.isArray(documents) ? documents : [];
  if (docRows.length > 0) {
    lines.push('', '【已归档报告】');
    for (const doc of docRows.slice(0, 10)) {
      const date = doc.reportDate
        ?? (doc.createdAt ? new Date(doc.createdAt).toISOString().slice(0, 10) : '未知日期');
      const title = doc.notes ?? doc.docType ?? '报告';
      const metricHint = doc.extractedMetrics?.length
        ? `（OCR 提取 ${doc.extractedMetrics.length} 项）`
        : '';
      lines.push(`- ${date} ${title}${metricHint}`);
      if (doc.ocrText) {
        const excerpt = String(doc.ocrText).replace(/\s+/g, ' ').trim().slice(0, 240);
        if (excerpt) lines.push(`  摘要: ${excerpt}${doc.ocrText.length > 240 ? '…' : ''}`);
      }
    }
  }

  lines.push(
    '',
    '请基于以上档案回答用户问题；若用户要求健康报告，输出结构化章节（概况、近期趋势、需留意项、建议下一步）。',
    '禁止诊断口吻；只解释变化并建议复测或就医。',
  );
  return lines.join('\n');
}

export function wrapHealthAgentUserMessage(context, userText) {
  const trimmed = String(userText ?? '').trim();
  const block = String(context ?? '').trim();
  if (!block) return trimmed;
  return `[系统提供的本人健康档案摘要，勿当作用户原话]\n${block}\n\n[用户问题]\n${trimmed}`;
}