/**
 * Shared PainterPalette.csv parsing, name matching, and influence cleaning.
 */
const fs = require('fs');
const path = require('path');

const CSV_PATH = path.join(__dirname, '../Inputs/PainterPalette.csv');

/** Gallery DB name → PainterPalette.csv artist column */
const DB_TO_PALETTE_NAME = {
  Bronzino: 'Agnolo Bronzino',
  Pontormo: 'Jacopo Pontormo',
  'Ivan Klyun': 'Ivan Kliun',
  'Henri Privat-Livemont': 'Henri Privat Livemont',
  Zeuxis: 'Zeuxis',
  Parrhasius: 'Parrhasius',
  'Theophanes the Greek': 'Theophanes the Greek',
  'J. M. W. Turner': 'J.M.W. Turner',
  'Édouard Manet': 'Edouard Manet',
  'Paul Cézanne': 'Paul Cezanne',
  'Eugène Delacroix': 'Eugene Delacroix',
  'François Boucher': 'Francois Boucher',
  'Jean-Auguste-Dominique Ingres': 'Jean Auguste Dominique Ingres',
  'Jean-Baptiste-Camille Corot': 'Jean-Baptiste-Camille Corot',
  'Wassily Kandinsky': 'Wassily Kandinsky',
  'Kazimir Malevich': 'Kazimir Malevich',
  'Willem de Kooning': 'Willem de Kooning',
  'René Magritte': 'Rene Magritte',
};

/** PainterPalette movement/style label → gallery art_movements.name */
const MOVEMENT_ALIASES = new Map(
  Object.entries({
    'byzantine art': 'Byzantine',
    byzantine: 'Byzantine',
    impressionism: 'Impressionism',
    'post-impressionism': 'Post-Impressionism',
    'neo-impressionism': 'Post-Impressionism',
    cubism: 'Cubism',
    'analytical cubism': 'Cubism',
    'synthetic cubism': 'Cubism',
    surrealism: 'Surrealism',
    symbolism: 'Symbolism',
    fauvism: 'Fauvism',
    expressionism: 'Expressionism',
    'abstract expressionism': 'Abstract Expressionism',
    futurism: 'Futurism',
    dada: 'Dada',
    constructivism: 'Constructivism',
    suprematism: 'Suprematism',
    'pop art': 'Pop Art',
    realism: 'Realism',
    romanticism: 'Romanticism',
    baroque: 'Baroque',
    rococo: 'Rococo',
    neoclassicism: 'Neoclassicism',
    'art nouveau': 'Art Nouveau',
    'art nouveau modern': 'Art Nouveau',
    gothic: 'Gothic',
    'high renaissance': 'High Renaissance',
    'early renaissance': 'Early Renaissance',
    'northern renaissance': 'Northern Renaissance',
    mannerism: 'Mannerism',
    'mannerism late renaissance': 'Mannerism',
    'ancient greek roman': 'Ancient Greek & Roman',
    'ancient greek & roman': 'Ancient Greek & Roman',
  })
);

function parseCSVLine(line) {
  const out = [];
  let cur = '';
  let q = false;
  for (let i = 0; i < line.length; i++) {
    const c = line[i];
    if (c === '"') {
      q = !q;
      continue;
    }
    if (c === ',' && !q) {
      out.push(cur);
      cur = '';
      continue;
    }
    cur += c;
  }
  out.push(cur);
  return out;
}

function normalizeName(name) {
  return (name || '')
    .toLowerCase()
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '')
    .replace(/[^a-z0-9]+/g, ' ')
    .trim();
}

function parseNameList(field) {
  if (!field || !String(field).trim()) return [];
  return String(field)
    .split(',')
    .map((s) => s.trim().replace(/^['"]|['"]$/g, ''))
    .filter(Boolean);
}

function isNoiseInfluenceName(name) {
  const n = name.trim();
  if (!n || n.length < 2) return true;
  if (/\.(jpg|jpeg|png|gif)\b/i.test(n)) return true;
  if (/^Artists\d/i.test(n)) return true;
  if (/\b(museum|gallery|tretyakov|hermitage|louvre|national museum)\b/i.test(n)) return true;
  if (/^(famous-people|male-portraits|female-portraits|winter|gardens-and-parks|rivers-and)/i.test(n)) return true;
  if (/^[a-z0-9]+(-[a-z0-9]+){2,}$/.test(n) && !/\s/.test(n)) return true;
  if (/^\d+(\.\d+)?\s*x\s*\d+(\.\d+)?\s*cm$/i.test(n)) return true;
  if (/^[\d\s.x×cm]+$/i.test(n)) return true;
  if (/^[^\x00-\x7F]+$/.test(n) && n.length < 40) return true;
  if (n.length > 120) return true;
  return false;
}

function paletteRowToMetadata(row, idx) {
  const num = (v) => {
    if (v == null || v === '') return null;
    const n = Number(v);
    return Number.isFinite(n) ? n : null;
  };
  return {
    source: 'PainterPalette.csv',
    nationality: row[idx.Nationality] || null,
    citizenship: row[idx.citizenship] || null,
    gender: row[idx.gender] || null,
    styles: row[idx.styles] || null,
    movement: row[idx.movement] || row[idx.ArtMovement] || null,
    art500k_movements: row[idx.Art500k_Movements] || null,
    birth_place: row[idx.birth_place] || null,
    death_place: row[idx.death_place] || null,
    birth_year: num(row[idx.birth_year]),
    death_year: num(row[idx.death_year]),
    first_year: num(row[idx.FirstYear]),
    last_year: num(row[idx.LastYear]),
    wikiart_pictures_count: num(row[idx.wikiart_pictures_count]),
    occupations: row[idx.occupations] || null,
    painting_school: row[idx.PaintingSchool] || null,
    styles_extended: row[idx.styles_extended] || null,
    influenced_by_raw: row[idx.Influencedby] || null,
    influenced_on_raw: row[idx.Influencedon] || null,
    teachers_raw: row[idx.Teachers] || null,
    pupils_raw: row[idx.Pupils] || null,
  };
}

function loadPainterPalette() {
  const lines = fs.readFileSync(CSV_PATH, 'utf8').split(/\r?\n/).filter(Boolean);
  const hdr = parseCSVLine(lines[0]);
  const idx = Object.fromEntries(hdr.map((h, i) => [h, i]));

  const byNorm = new Map();
  const byExact = new Map();

  for (let i = 1; i < lines.length; i++) {
    const row = parseCSVLine(lines[i]);
    const artist = row[idx.artist]?.trim();
    if (!artist) continue;
    const entry = { artist, row, idx, metadata: paletteRowToMetadata(row, idx) };
    byExact.set(artist.toLowerCase(), entry);
    byNorm.set(normalizeName(artist), entry);
  }

  return { idx, byNorm, byExact, rowCount: lines.length - 1 };
}

function findPaletteRow(dbName, palette) {
  const alias = DB_TO_PALETTE_NAME[dbName];
  if (alias) {
    const hit = palette.byExact.get(alias.toLowerCase());
    if (hit) return hit;
  }
  const exact = palette.byExact.get(dbName.toLowerCase());
  if (exact) return exact;
  const norm = palette.byNorm.get(normalizeName(dbName));
  if (norm) return norm;

  const dbNorm = normalizeName(dbName);
  const parts = dbNorm.split(' ').filter(Boolean);
  if (parts.length >= 2) {
    const last = parts[parts.length - 1];
    const candidates = [];
    for (const [n, entry] of palette.byNorm) {
      if (n.endsWith(` ${last}`) || n === last) candidates.push(entry);
    }
    if (candidates.length === 1) return candidates[0];
  }
  return null;
}

function buildArtistResolver(dbArtists) {
  const byNorm = new Map();
  const byLast = new Map();

  for (const a of dbArtists) {
    const norm = normalizeName(a.name);
    if (!byNorm.has(norm)) byNorm.set(norm, a);
    const parts = norm.split(' ').filter(Boolean);
    const last = parts[parts.length - 1];
    if (!byLast.has(last)) byLast.set(last, []);
    byLast.get(last).push(a);
  }

  function resolve(rawName) {
    const name = rawName.trim();
    if (!name || isNoiseInfluenceName(name)) return null;

    const alias = DB_TO_PALETTE_NAME[name] || name;
    const norm = normalizeName(alias);
    if (byNorm.has(norm)) return { type: 'artist', artist: byNorm.get(norm).name, id: byNorm.get(norm).id };

    const parts = norm.split(' ').filter(Boolean);
    if (parts.length >= 2) {
      const last = parts[parts.length - 1];
      const cands = (byLast.get(last) || []).filter((a) => {
        const an = normalizeName(a.name);
        return parts.every((p) => an.includes(p));
      });
      if (cands.length === 1) return { type: 'artist', artist: cands[0].name, id: cands[0].id };
    }

    const movementKey = norm.replace(/\s+/g, ' ');
    if (MOVEMENT_ALIASES.has(movementKey)) {
      return { type: 'movement', movement: MOVEMENT_ALIASES.get(movementKey) };
    }
    for (const [key, movement] of MOVEMENT_ALIASES) {
      if (movementKey === key || movementKey.startsWith(`${key} `)) {
        return { type: 'movement', movement };
      }
    }

    return null;
  }

  return { resolve };
}

function collectInfluenceSources(paletteEntry) {
  const { row, idx } = paletteEntry;
  const sources = [];
  const seen = new Set();

  const addField = (field, role) => {
    for (const raw of parseNameList(row[idx[field]])) {
      const key = `${role}:${normalizeName(raw)}`;
      if (seen.has(key)) continue;
      seen.add(key);
      sources.push({ raw, role });
    }
  };

  addField('Teachers', 'teacher');
  addField('Influencedby', 'influenced_by');
  addField('Influencedon', 'influenced_on');
  addField('Pupils', 'pupil');
  return sources;
}

module.exports = {
  CSV_PATH,
  DB_TO_PALETTE_NAME,
  MOVEMENT_ALIASES,
  parseCSVLine,
  normalizeName,
  parseNameList,
  isNoiseInfluenceName,
  paletteRowToMetadata,
  loadPainterPalette,
  findPaletteRow,
  buildArtistResolver,
  collectInfluenceSources,
};