/**
 * Publications Controller
 * API endpoints for publication targets metadata
 */

const publicationTargets = require('../config/publication-targets.config');

/**
 * GET /api/publications
 * Get all publication targets with optional filtering
 */
async function getPublications(req, res) {
  try {
    const {
      type,      // letter, oped, social
      tier,      // premier, specialist, regional, digital
      culture,   // global-north, asia, developing-world
      minRank,
      maxRank,
      language   // en, de, fr, pt, zh, etc.
    } = req.query;

    // Get all publications
    let publications = publicationTargets.getAllPublications();

    // Apply filters
    if (type) {
      publications = publications.filter(p => p.type === type);
    }

    if (tier) {
      publications = publications.filter(p => p.tier === tier);
    }

    if (culture) {
      publications = publications.filter(p =>
        p.culture && p.culture.includes(culture)
      );
    }

    if (minRank) {
      publications = publications.filter(p => p.rank >= parseInt(minRank, 10));
    }

    if (maxRank) {
      publications = publications.filter(p => p.rank <= parseInt(maxRank, 10));
    }

    if (language) {
      publications = publications.filter(p =>
        p.requirements && p.requirements.language === language
      );
    }

    // Sort by rank
    publications.sort((a, b) => a.rank - b.rank);

    res.json({
      success: true,
      count: publications.length,
      data: publications
    });
  } catch (error) {
    console.error('[Publications] Get publications error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to fetch publications'
    });
  }
}

/**
 * GET /api/publications/:id
 * Get specific publication by ID
 */
async function getPublicationById(req, res) {
  try {
    const { id } = req.params;

    const publication = publicationTargets.getPublicationById(id);

    if (!publication) {
      return res.status(404).json({
        success: false,
        error: 'Publication not found'
      });
    }

    res.json({
      success: true,
      data: publication
    });
  } catch (error) {
    console.error('[Publications] Get publication by ID error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to fetch publication'
    });
  }
}

/**
 * GET /api/publications/summary
 * Get summary statistics about publications
 */
async function getPublicationsSummary(req, res) {
  try {
    const publications = publicationTargets.getAllPublications();

    // Calculate summary statistics
    const summary = {
      total: publications.length,
      byType: {
        letter: publications.filter(p => p.type === 'letter').length,
        oped: publications.filter(p => p.type === 'oped').length,
        social: publications.filter(p => p.type === 'social').length
      },
      byTier: {
        premier: publications.filter(p => p.tier === 'premier').length,
        specialist: publications.filter(p => p.tier === 'specialist').length,
        regional: publications.filter(p => p.tier === 'regional').length,
        digital: publications.filter(p => p.tier === 'digital').length
      },
      byCulture: {
        'global-north': publications.filter(p => p.culture && p.culture.includes('global-north')).length,
        'asia': publications.filter(p => p.culture && p.culture.includes('asia')).length,
        'developing-world': publications.filter(p => p.culture && p.culture.includes('developing-world')).length
      },
      byLanguage: {
        en: publications.filter(p => !p.requirements?.language || p.requirements.language === 'en').length,
        de: publications.filter(p => p.requirements?.language === 'de').length,
        fr: publications.filter(p => p.requirements?.language === 'fr').length,
        pt: publications.filter(p => p.requirements?.language === 'pt').length,
        zh: publications.filter(p => p.requirements?.language === 'zh').length
      },
      verified: publications.filter(p => p.verified).length,
      unverified: publications.filter(p => !p.verified).length
    };

    res.json({
      success: true,
      data: summary
    });
  } catch (error) {
    console.error('[Publications] Get summary error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to fetch publication summary'
    });
  }
}

module.exports = {
  getPublications,
  getPublicationById,
  getPublicationsSummary
};