/**
 * AcademicSearchAdapter - 学術文献検索モード
 *
 * REQ-ACAD-001: 学術文献検索モード
 * DES-SHIKIGAMI-014 Section 3.4
 * TSK-TS-004
 *
 * @version 1.14.0
 */

/**
 * 学術検索オプション
 */
export interface AcademicSearchOptions {
  /** 検索対象ソース */
  sources?: ('pubmed' | 'google_scholar' | 'semantic_scholar')[];
  /** 言語 */
  language?: 'en' | 'ja';
  /** 発行年範囲 */
  yearRange?: {
    from?: number;
    to?: number;
  };
  /** MeSH用語への変換を有効化 */
  enableMeshConversion?: boolean;
  /** 最大結果数 */
  maxResults?: number;
}

/**
 * デフォルトオプション
 */
export const DEFAULT_ACADEMIC_OPTIONS: Required<AcademicSearchOptions> = {
  sources: ['pubmed', 'google_scholar'],
  language: 'en',
  yearRange: { from: undefined, to: undefined },
  enableMeshConversion: true,
  maxResults: 10,
};

/**
 * MeSH用語辞書（一般用語 → MeSH用語）
 */
export const MESH_DICTIONARY: Record<string, string[]> = {
  // 疾患
  'がん': ['Neoplasms', 'Cancer'],
  '癌': ['Neoplasms', 'Cancer'],
  'cancer': ['Neoplasms'],
  '糖尿病': ['Diabetes Mellitus'],
  'diabetes': ['Diabetes Mellitus'],
  '高血圧': ['Hypertension'],
  'hypertension': ['Hypertension'],
  'アルツハイマー': ['Alzheimer Disease'],
  'alzheimer': ['Alzheimer Disease'],
  '心臓病': ['Heart Diseases'],
  'heart disease': ['Heart Diseases'],
  '肺炎': ['Pneumonia'],
  'pneumonia': ['Pneumonia'],

  // 治療法
  '免疫療法': ['Immunotherapy'],
  'immunotherapy': ['Immunotherapy'],
  '化学療法': ['Drug Therapy'],
  'chemotherapy': ['Drug Therapy'],
  '遺伝子治療': ['Gene Therapy'],
  'gene therapy': ['Gene Therapy'],
  '幹細胞': ['Stem Cells'],
  'stem cell': ['Stem Cells'],

  // 技術・手法
  'AI': ['Artificial Intelligence'],
  '人工知能': ['Artificial Intelligence'],
  'artificial intelligence': ['Artificial Intelligence'],
  '機械学習': ['Machine Learning'],
  'machine learning': ['Machine Learning'],
  'ディープラーニング': ['Deep Learning'],
  'deep learning': ['Deep Learning'],
  'CRISPR': ['CRISPR-Cas Systems'],
  'ゲノム編集': ['Gene Editing'],
  'genome editing': ['Gene Editing'],

  // 分野
  '神経科学': ['Neurosciences'],
  'neuroscience': ['Neurosciences'],
  '免疫学': ['Immunology'],
  'immunology': ['Immunology'],
  '分子生物学': ['Molecular Biology'],
  'molecular biology': ['Molecular Biology'],
};

/**
 * 学術クエリ結果
 */
export interface AcademicQueryResult {
  /** 元のクエリ */
  originalQuery: string;
  /** 変換されたクエリ */
  convertedQuery: string;
  /** MeSH用語（変換された場合） */
  meshTerms?: string[];
  /** ソース別クエリ */
  sourceQueries: {
    pubmed?: string;
    googleScholar?: string;
    semanticScholar?: string;
  };
  /** ソース別URL */
  sourceUrls: {
    pubmed?: string;
    googleScholar?: string;
    semanticScholar?: string;
  };
}

/**
 * 一般用語をMeSH用語に変換
 */
export function convertToMeSH(query: string): {
  meshTerms: string[];
  unmatchedTerms: string[];
} {
  const words = query.toLowerCase().split(/\s+/);
  const meshTerms: string[] = [];
  const unmatchedTerms: string[] = [];

  // 単語ごとにマッチングを試みる
  for (const word of words) {
    const trimmedWord = word.trim();
    if (!trimmedWord) continue;

    // 完全一致を試みる
    if (MESH_DICTIONARY[trimmedWord]) {
      meshTerms.push(...MESH_DICTIONARY[trimmedWord]);
    } else {
      // 部分一致を試みる
      let found = false;
      for (const [key, values] of Object.entries(MESH_DICTIONARY)) {
        if (trimmedWord.includes(key) || key.includes(trimmedWord)) {
          meshTerms.push(...values);
          found = true;
          break;
        }
      }
      if (!found) {
        unmatchedTerms.push(trimmedWord);
      }
    }
  }

  // 重複を除去
  const uniqueMeshTerms = [...new Set(meshTerms)];

  return {
    meshTerms: uniqueMeshTerms,
    unmatchedTerms,
  };
}

/**
 * 学術検索用にクエリをフォーマット
 */
export function formatAcademicQuery(
  query: string,
  options?: AcademicSearchOptions
): AcademicQueryResult {
  const effectiveOptions: Required<AcademicSearchOptions> = {
    ...DEFAULT_ACADEMIC_OPTIONS,
    ...options,
  };

  let convertedQuery = query;
  let meshTerms: string[] | undefined;

  // MeSH変換
  if (effectiveOptions.enableMeshConversion) {
    const meshResult = convertToMeSH(query);
    if (meshResult.meshTerms.length > 0) {
      meshTerms = meshResult.meshTerms;
      // MeSH用語と元の用語を組み合わせる
      const combinedTerms = [
        ...meshResult.meshTerms,
        ...meshResult.unmatchedTerms,
      ];
      convertedQuery = combinedTerms.join(' ');
    }
  }

  // 年範囲フィルターを追加
  let yearFilter = '';
  if (effectiveOptions.yearRange.from || effectiveOptions.yearRange.to) {
    const from = effectiveOptions.yearRange.from ?? 1900;
    const to = effectiveOptions.yearRange.to ?? new Date().getFullYear();
    yearFilter = `${from}:${to}`;
  }

  // ソース別クエリを生成
  const sourceQueries: AcademicQueryResult['sourceQueries'] = {};
  const sourceUrls: AcademicQueryResult['sourceUrls'] = {};

  if (effectiveOptions.sources.includes('pubmed')) {
    // PubMed用クエリ
    let pubmedQuery = convertedQuery;
    if (meshTerms && meshTerms.length > 0) {
      pubmedQuery = meshTerms.map((term) => `"${term}"[MeSH]`).join(' OR ');
    }
    if (yearFilter) {
      pubmedQuery += ` AND ${yearFilter}[dp]`;
    }
    sourceQueries.pubmed = pubmedQuery;
    sourceUrls.pubmed = `https://pubmed.ncbi.nlm.nih.gov/?term=${encodeURIComponent(pubmedQuery)}`;
  }

  if (effectiveOptions.sources.includes('google_scholar')) {
    // Google Scholar用クエリ
    let scholarQuery = convertedQuery;
    if (yearFilter) {
      const [from, to] = yearFilter.split(':');
      scholarQuery += ` after:${from} before:${to}`;
    }
    sourceQueries.googleScholar = scholarQuery;
    sourceUrls.googleScholar = `https://scholar.google.com/scholar?q=${encodeURIComponent(scholarQuery)}`;
  }

  if (effectiveOptions.sources.includes('semantic_scholar')) {
    // Semantic Scholar用クエリ
    sourceQueries.semanticScholar = convertedQuery;
    sourceUrls.semanticScholar = `https://www.semanticscholar.org/search?q=${encodeURIComponent(convertedQuery)}`;
  }

  return {
    originalQuery: query,
    convertedQuery,
    meshTerms,
    sourceQueries,
    sourceUrls,
  };
}

/**
 * 検索クエリが学術的かどうかを判定
 */
export function isAcademicQuery(query: string): boolean {
  const academicIndicators = [
    // 学術キーワード
    '論文', 'paper', 'research', '研究', 'study', '調査',
    'clinical', '臨床', 'trial', '治験',
    'review', 'レビュー', 'meta-analysis', 'メタ分析',
    'journal', 'ジャーナル', 'publication', '出版',
    // 学術ソース
    'pubmed', 'scholar', 'arxiv', 'nature', 'science',
    // 学術フレーズ
    'et al', '参考文献', 'reference', 'citation', '引用',
  ];

  const lowerQuery = query.toLowerCase();
  return academicIndicators.some((indicator) =>
    lowerQuery.includes(indicator.toLowerCase())
  );
}

/**
 * AcademicSearchAdapter - 学術検索アダプター
 */
export class AcademicSearchAdapter {
  private readonly options: Required<AcademicSearchOptions>;

  constructor(options?: AcademicSearchOptions) {
    this.options = { ...DEFAULT_ACADEMIC_OPTIONS, ...options };
  }

  /**
   * クエリを学術検索用に変換
   */
  formatQuery(query: string): AcademicQueryResult {
    return formatAcademicQuery(query, this.options);
  }

  /**
   * MeSH用語に変換
   */
  convertToMeSH(query: string): ReturnType<typeof convertToMeSH> {
    return convertToMeSH(query);
  }

  /**
   * 学術クエリかどうかを判定
   */
  isAcademicQuery(query: string): boolean {
    return isAcademicQuery(query);
  }

  /**
   * オプションを取得
   */
  getOptions(): Required<AcademicSearchOptions> {
    return { ...this.options };
  }

  /**
   * 年範囲を設定
   */
  setYearRange(from?: number, to?: number): void {
    this.options.yearRange = { from, to };
  }

  /**
   * MeSH辞書に用語を追加
   */
  static addMeshTerm(term: string, meshTerms: string[]): void {
    MESH_DICTIONARY[term.toLowerCase()] = meshTerms;
  }

  /**
   * MeSH辞書を取得
   */
  static getMeshDictionary(): Record<string, string[]> {
    return { ...MESH_DICTIONARY };
  }
}