periodicos-capes-mcp/dist/qualis-service.js

MCP server para consulta de periódicos científicos do Portal de Periódicos CAPES

import Database from 'better-sqlite3';
import path from 'path';
import { fileURLToPath } from 'url';
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
export class QualisService {
    static instance;
    db = null;
    getQualisStmt = null;
    constructor() { }
    static getInstance() {
        if (!QualisService.instance) {
            QualisService.instance = new QualisService();
        }
        return QualisService.instance;
    }
    initDatabase() {
        if (this.db)
            return;
        const dbPath = path.join(__dirname, '..', 'data', 'qualis.db');
        try {
            this.db = new Database(dbPath, { readonly: true });
            this.getQualisStmt = this.db.prepare(`
        SELECT issn, journal_name, area, classification 
        FROM qualis 
        WHERE issn = ? OR issn = ?
      `);
        }
        catch (error) {
            this.db = null;
        }
    }
    isAvailable() {
        this.initDatabase();
        return this.db !== null;
    }
    getQualisByISSN(issn) {
        if (!this.isAvailable() || !this.getQualisStmt) {
            return null;
        }
        try {
            // Try both with and without hyphen (some databases store differently)
            const issnWithHyphen = this.formatISSN(issn);
            const issnWithoutHyphen = issn.replace('-', '');
            const result = this.getQualisStmt.get(issnWithHyphen, issnWithoutHyphen);
            return result || null;
        }
        catch (error) {
            return null;
        }
    }
    formatISSN(issn) {
        // Remove any existing formatting
        const clean = issn.replace(/[^0-9X]/gi, '');
        // Add hyphen if not present and valid length
        if (clean.length === 8 && !issn.includes('-')) {
            return `${clean.substring(0, 4)}-${clean.substring(4)}`;
        }
        return issn;
    }
    close() {
        if (this.db) {
            this.db.close();
            this.db = null;
            this.getQualisStmt = null;
        }
    }
}