import { config } from '../config/Config.js';

/**
 * Names.
 *
 * Two different strategies, both seed-deterministic:
 *
 *   STARS & THE GALAXY — synthesised from syllable pools (data/naming.json →
 *   star / galaxy). Short, consistent, and effectively unlimited: there are
 *   60 systems and no reason to run out of star names.
 *
 *   PLANETS & STATIONS — drawn from finite, curated NAME BANKS (data/
 *   naming.json → banks). A deep pool of hand-picked names — colonial
 *   "New Denver" worlds and alien "Klaxoria" worlds; official designations
 *   like "Deep Space SC-145" and smuggler hangouts like "Hell's Hideout".
 *   Within a single system a planet never repeats another planet's name and
 *   a station never repeats another station's name (no-duplicate drawing).
 *   Across the galaxy a finite pool must eventually recur — that's the cost
 *   of keeping generation LAZY and ORDER-INDEPENDENT (see
 *   docs/PROJECT_NOTES.md → "Determinism rules").
 *
 * How the banks are dealt out:
 *   const deck = NameGenerator.planetDeck(Rng.derive(seed, 'system', id, 'names', 'planets'));
 *   const name = deck[i % deck.length];   // i = the system's i-th planet
 *
 * The deck is a seeded SHUFFLE of the whole bank, so the first N draws are
 * N distinct names until the bank is exhausted. `Rng.derive(..., 'system',
 * id, ...)` keeps it independent per system ⇒ lazy === eager.
 */

const FALLBACK = {
  star: {
    syllables: ['ka', 'vel', 'thu', 'ori', 'an', 'esh', 'mar', 'dy', 'neth', 'avi', 'cor', 'lu', 'tan', 'ys', 'brei', 'hal', 'ion'],
    minParts: 2,
    maxParts: 4,
  },
  galaxy: {
    syllables: ['an', 'dro', 'me', 'mil', 'ky', 'cen', 'tau', 'rhi', 'sa', 'vel', 'pyr', 'os'],
    minParts: 3,
    maxParts: 5,
  },
  asteroid: {
    syllables: ['ka', 'ver', 'dor', 'thra', 'nix', 'oru', 'mal', 'cra', 'zeth', 'vel', 'kor'],
    minParts: 2,
    maxParts: 3,
    suffixes: ['Field', 'Drift', 'Patch', 'Reef', 'Shoals', 'Belt'],
  },
  // Tiny built-in pools so the game still names things if data/naming.json
  // is missing. The real banks live in data/naming.json → banks.
  planet: ['New Denver', 'Klaxoria', 'New Austin', 'Zyneatha', 'New Phoenix', 'Vexithunhal', 'New Dallas', 'Kordrasul'],
  station: ['Deep Space SC-145', "Hell's Hideout", 'Beacon 4491', 'The Rusty Anchor', 'Station 9012', 'The Shadow Quay'],
};

const ROMAN = ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX', 'X', 'XI', 'XII', 'XIII', 'XIV', 'XV', 'XVI', 'XVII', 'XVIII', 'XIX', 'XX'];

function section(name, fallback) {
  const v = config.get(`naming.${name}`);
  return (v && typeof v === 'object') ? v : fallback;
}

function capitalize(s) {
  return s.length ? s.charAt(0).toUpperCase() + s.slice(1) : s;
}

function joinSyllables(rng, syllables, minParts, maxParts) {
  const parts = rng.int(minParts, maxParts);
  let out = '';
  for (let i = 0; i < parts; i++) out += rng.pick(syllables) ?? 'a';
  return capitalize(out);
}

/**
 * The combined name bank for a category: the curated sub-pools concatenated
 * (planets: colonial + alien; stations: procedural + smuggler). Deduplicated
 * defensively in case the JSON has an accidental repeat.
 */
function combinedBank(pools) {
  const out = [];
  const seen = new Set();
  for (const pool of pools) {
    if (!Array.isArray(pool)) continue;
    for (const name of pool) {
      if (typeof name !== 'string' || !name) continue;
      if (seen.has(name)) continue;
      seen.add(name);
      out.push(name);
    }
  }
  return out;
}

/** "1" → "I" … "20" → "XX"; beyond that, plain digits. */
export function ordinalLabel(n) {
  return ROMAN[n - 1] ?? String(n);
}

export const NameGenerator = {
  /** A star / system name: "Kethavoryn". */
  star(rng) {
    const s = section('star', FALLBACK.star);
    const syllables = Array.isArray(s.syllables) && s.syllables.length ? s.syllables : FALLBACK.star.syllables;
    return joinSyllables(rng, syllables, s.minParts ?? 2, s.maxParts ?? 4);
  },

  /** A galaxy name: "Vethani". */
  galaxy(rng) {
    const g = section('galaxy', FALLBACK.galaxy);
    const syllables = Array.isArray(g.syllables) && g.syllables.length ? g.syllables : FALLBACK.galaxy.syllables;
    return joinSyllables(rng, syllables, g.minParts ?? 3, g.maxParts ?? 5);
  },

  /**
   * An asteroid cluster name: "Kaveru Field" — synthesised syllables plus a
   * field-like suffix (unbounded, like stars; data/naming.json → asteroid).
   */
  asteroid(rng) {
    const s = section('asteroid', FALLBACK.asteroid);
    const syllables = Array.isArray(s.syllables) && s.syllables.length ? s.syllables : FALLBACK.asteroid.syllables;
    const suffixes = Array.isArray(s.suffixes) && s.suffixes.length ? s.suffixes : FALLBACK.asteroid.suffixes;
    return `${joinSyllables(rng, syllables, s.minParts ?? 2, s.maxParts ?? 3)} ${rng.pick(suffixes) ?? 'Field'}`;
  },

  /**
   * A shuffled deck of PLANET names for one system. The first N draws are N
   * distinct names (until the bank is exhausted). Pure function of (rng) ⇒
   * deterministic and order-independent when the rng is a per-system derive.
   */
  planetDeck(rng) {
    const b = config.get('naming.banks.planet', null);
    const pools = (b && (Array.isArray(b.colonial) || Array.isArray(b.alien)))
      ? [b.colonial, b.alien]
      : [FALLBACK.planet];
    const names = combinedBank(pools);
    return names.length ? rng.shuffle(names) : Array.from(FALLBACK.planet);
  },

  /**
   * A shuffled deck of STATION names for one system (official designations +
   * smuggler hangouts). Same no-duplicate-until-exhausted guarantee.
   */
  stationDeck(rng) {
    const b = config.get('naming.banks.station', null);
    const pools = (b && (Array.isArray(b.procedural) || Array.isArray(b.smuggler)))
      ? [b.procedural, b.smuggler]
      : [FALLBACK.station];
    const names = combinedBank(pools);
    return names.length ? rng.shuffle(names) : Array.from(FALLBACK.station);
  },
};