import { AssessmentProfile, AssessmentRecord, ScoreThreshold } from '@/lib/assessment-types';

function date(value: string) {
  return new Date(value).toLocaleString('zh-CN', { hour12: false });
}

function thresholdsToText(thresholds: ScoreThreshold[]) {
  if (!thresholds.length) return '无固定阈值';
  return thresholds.map((item) => `${item.min} 分起：${item.label}`).join('；');
}

function scoreRange(record: AssessmentRecord) {
  const { min, max } = record.scoreSummary;
  return max === undefined ? `最低 ${min}` : `${min} - ${max}`;
}

export function recordToMarkdown(record: AssessmentRecord, profileName: string) {
  const lines = [
    `# ${record.questionnaireTitle}测评记录`,
    '',
    '## 基本信息',
    `- 档案：${profileName || '未命名档案'}`,
    `- 测评时间：${date(record.completedAt)}`,
    `- 量表编号：${record.questionnaireId}`,
    `- 量表版本：${record.questionnaireVersion}`,
    `- 计分版本：${record.scoreVersion}`,
    `- 题目数量：${record.answers.length}`,
    '',
    '## 计分规则',
    `- 分数范围：${scoreRange(record)}`,
    `- 高分含义：${record.scoreSummary.highScoreMeaning}`,
    `- 反向题：${record.scoreSummary.reverseItems.length ? record.scoreSummary.reverseItems.join('、') : '无'}`,
    `- 临界值：${thresholdsToText(record.scoreSummary.thresholds)}`,
    `- 计分状态：${record.scoreSummary.scoringStatus === 'structured' ? '结构化计分' : '原始分保存'}`,
    '',
  ];

  if (record.scoreSummary.metrics.length) {
    lines.push('## 分数摘要');
    record.scoreSummary.metrics.forEach((item) => {
      const range = item.max !== undefined ? ` / ${item.max}` : '';
      const level = item.level ? `（${item.level}）` : '';
      lines.push(`- ${item.label}：${item.value}${range}${level}`);
    });
    if (record.scoreSummary.note) lines.push('', record.scoreSummary.note);
    lines.push('');
  }

  if (record.analysisText) lines.push('## 结果说明', record.analysisText, '');

  lines.push('## 完整问答');
  record.answers.forEach((item, index) => {
    lines.push(`${index + 1}. ${item.question}`, `   回答：${item.answer}`, '');
  });

  lines.push(
    '## 使用说明',
    '本记录仅供自我了解、教育和研究参考，不构成医学或心理诊断。',
  );
  return lines.join('\n');
}

export function profileToMarkdown(profile: AssessmentProfile, records: AssessmentRecord[]) {
  const lines = [
    `# ${profile.name}的完整测评档案`,
    '',
    `- 导出时间：${date(new Date().toISOString())}`,
    `- 测评次数：${records.length}`,
    '',
    '---',
    '',
  ];
  records
    .slice()
    .sort((a, b) => a.completedAt.localeCompare(b.completedAt))
    .forEach((record) => lines.push(recordToMarkdown(record, profile.name), '', '---', ''));
  return lines.join('\n');
}

export function downloadText(filename: string, content: string, type: string) {
  const blob = new Blob([content], { type });
  const url = URL.createObjectURL(blob);
  const anchor = document.createElement('a');
  anchor.href = url;
  anchor.download = filename;
  anchor.click();
  URL.revokeObjectURL(url);
}