/* EMOJESIS data validator + teaching-chain simulation.
   Run: node validate.js */
'use strict';

const { ELEMENTS, RECIPES, CATEGORIES, STARTERS } = require('./js/data.js');

let failures = 0;
const fail = (msg) => { failures++; console.error('  FAIL: ' + msg); };
const ok = (msg) => console.log('  ok: ' + msg);

const pairKey = (a, b, ordered) =>
  ordered ? a + '>' + b : [a, b].sort().join('|');

/* 1. Referential integrity + element fields */
console.log('\n[1] Referential integrity & element fields');
for (const id of Object.keys(ELEMENTS)) {
  const e = ELEMENTS[id];
  if (e.id !== id) fail(`element key "${id}" mismatches e.id "${e.id}"`);
  for (const f of ['id', 'emoji', 'name', 'category', 'description']) {
    if (!e[f] || typeof e[f] !== 'string') fail(`element "${id}" missing field "${f}"`);
  }
  if (e.category && !CATEGORIES.includes(e.category)) {
    fail(`element "${id}" has unknown category "${e.category}"`);
  }
}
for (const id of STARTERS) {
  if (!ELEMENTS[id]) fail(`starter "${id}" missing from ELEMENTS`);
}
RECIPES.forEach((r, i) => {
  const tag = `recipe #${i} (${r.a}+${r.b}=${r.result})`;
  if (!ELEMENTS[r.a]) fail(`${tag}: input "${r.a}" does not exist`);
  if (!ELEMENTS[r.b]) fail(`${tag}: input "${r.b}" does not exist`);
  if (!ELEMENTS[r.result]) fail(`${tag}: result "${r.result}" does not exist`);
  if (!r.msg || typeof r.msg !== 'string') fail(`${tag}: missing msg`);
});
if (failures === 0) ok('all references and fields valid');

/* 2. Duplicate recipes */
console.log('\n[2] Duplicate recipes');
{
  const seen = new Map();
  RECIPES.forEach((r, i) => {
    const k = pairKey(r.a, r.b, r.ordered);
    if (seen.has(k)) {
      fail(`duplicate recipe pair "${k}" at #${seen.get(k)} and #${i}`);
    } else {
      seen.set(k, i);
    }
  });
  if (failures === 0) ok('no duplicate pairs');
}

/* 3. Reachability BFS to fixpoint (nightOnly ignored — craftable at some hour) */
console.log('\n[3] Reachability from starters');
{
  const reachable = new Set(STARTERS);
  let changed = true;
  while (changed) {
    changed = false;
    for (const r of RECIPES) {
      if (!reachable.has(r.result) && reachable.has(r.a) && reachable.has(r.b)) {
        reachable.add(r.result);
        changed = true;
      }
    }
  }
  const unreachable = Object.keys(ELEMENTS).filter((id) => !reachable.has(id));
  for (const id of unreachable) fail(`element "${id}" is unreachable from starters`);
  if (unreachable.length === 0) ok(`all ${Object.keys(ELEMENTS).length} elements reachable`);
}

/* 4. Counts */
console.log('\n[4] Content counts');
{
  const nEl = Object.keys(ELEMENTS).length;
  const nRe = RECIPES.length;
  const cats = new Set(Object.values(ELEMENTS).map((e) => e.category));
  const secrets = new Set();
  for (const e of Object.values(ELEMENTS)) if (e.secret) secrets.add(e.id);
  for (const r of RECIPES) if (r.secret) secrets.add(r.result);
  console.log(`  elements:   ${nEl}`);
  console.log(`  recipes:    ${nRe}`);
  console.log(`  categories: ${cats.size} (${[...cats].join(', ')})`);
  console.log(`  secrets:    ${secrets.size}`);
  if (nEl < 100) fail(`only ${nEl} elements (need >= 100)`);
  if (nRe < 160 || nRe > 220) fail(`recipe count ${nRe} outside 160-220`);
  if (cats.size < 8) fail(`only ${cats.size} categories (need >= 8)`);
  if (secrets.size < 6) fail(`only ${secrets.size} secrets (need >= 6)`);
}

/* 5. Teaching chain — exact combos */
console.log('\n[5] Teaching chain (exact combos)');
{
  const chain = [
    ['fire', 'water', 'steam'],
    ['water', 'earth', 'mud'],
    ['air', 'water', 'cloud'],
    ['cloud', 'water', 'rain'],
    ['rain', 'earth', 'life'],
    ['life', 'water', 'plant'],
    ['plant', 'time', 'tree'],
    ['tree', 'fire', 'wood'],
    ['earth', 'earth', 'mountain'],
    ['human', 'earth', 'tool']
  ];
  for (const [a, b, result] of chain) {
    const hit = RECIPES.find(
      (r) => !r.ordered && r.result === result &&
        ((r.a === a && r.b === b) || (r.a === b && r.b === a))
    );
    if (!hit) fail(`teaching chain combo ${a}+${b}=${result} not found`);
  }
  /* Signature combos */
  const sig = [
    ['brain', 'lightning', 'idea'],
    ['book', 'fire', 'forbiddenBook'],
    ['computer', 'coffee', 'developer'],
    ['internet', 'house', 'personalWebsite'],
    ['skull', 'love', 'undead'],
    ['cat', 'computer', 'internetCat'],
    ['robot', 'love', 'syntheticHeart'],
    ['moon', 'key', 'secret'],
    ['statue', 'phone', 'ancientInfluencer'],
    ['personalWebsite', 'writing', 'blog'],
    ['blog', 'antenna', 'rss']
  ];
  for (const [a, b, result] of sig) {
    const hit = RECIPES.find(
      (r) => r.result === result &&
        ((r.a === a && r.b === b) || (!r.ordered && r.a === b && r.b === a))
    );
    if (!hit) fail(`signature combo ${a}+${b}=${result} not found`);
  }
  if (failures === 0) ok('teaching chain + signature combos present');
}

/* 6. Daily-challenge target pool for a fresh save */
console.log('\n[6] Daily challenge pool (fresh save)');
{
  const nonStarters = Object.keys(ELEMENTS).filter((id) => !STARTERS.includes(id));
  if (nonStarters.length === 0) fail('no non-starter elements available as daily goals');
  else ok(`${nonStarters.length} candidate goals for a fresh save`);
}

/* 7. Simulation: craft the teaching chain step by step from a fresh save */
console.log('\n[7] Simulated playthrough of the teaching chain');
{
  const owned = new Set(STARTERS);
  const combine = (a, b) => {
    const r = RECIPES.find(
      (x) => !x.ordered &&
        ((x.a === a && x.b === b) || (x.a === b && x.b === a))
    );
    return r ? r.result : null;
  };
  const steps = [
    ['fire', 'water', 'steam'],
    ['water', 'earth', 'mud'],
    ['air', 'water', 'cloud'],
    ['cloud', 'water', 'rain'],
    ['rain', 'earth', 'life'],
    ['life', 'water', 'plant'],
    ['steam', 'earth', 'time'],
    ['plant', 'time', 'tree'],
    ['tree', 'fire', 'wood'],
    ['earth', 'earth', 'mountain'],
    ['life', 'mud', 'human'],
    ['human', 'earth', 'tool']
  ];
  for (const [a, b, expect] of steps) {
    if (!owned.has(a) || !owned.has(b)) {
      fail(`sim: "${a}" or "${b}" not yet discovered when needed`);
      continue;
    }
    const got = combine(a, b);
    if (got !== expect) fail(`sim: ${a}+${b} gave "${got}", expected "${expect}"`);
    else owned.add(got);
  }
  if (failures === 0) ok(`simulation complete — ${owned.size} elements discovered`);
}

/* Summary */
console.log('');
if (failures > 0) {
  console.error(`VALIDATION FAILED: ${failures} problem(s).`);
  process.exit(1);
} else {
  console.log('VALIDATION PASSED.');
}