const air = 'minecraft:air';

function unificationBlacklistEntry(material, type) {
  return { material: material, type: type };
}

function entryIsBlacklisted(material, type) {
  for (var i = 0; i < unificationBlacklist.length; i++) {
      if (unificationBlacklist[i].material === material && unificationBlacklist[i].type === type) {
          return true;
      }
  }
  return false;
}

function getPreferredItemInTag(tag) {
  const pref = wrapArray(tag.stacks).sort(({ mod: a }, { mod: b }) => compareIndices(a, b, tag))[0] || item.of(air);
  return pref;
}

function compareIndices(a, b, tag) {
  if (a == b) return 0; // iff a == b, they'll be found at the same position in modPriorities

  for (let mod of modPriorities) {
      if (mod == a) return -1; // if a comes before b, then idx(a) < idx(b), so -1
      if (mod == b) return 1; // if a comes after b, then idx(a) > idx(b), so 1
  }

  console.error('[' + a + ', ' + b + '] were both unaccounted for in mod unification' + (tag ? ' for ' + tag : '!'));
  return 0;
}

function wrapArray(array) {
  return utils.listOf(array).toArray();
}

function tagIsEmpty(tag) {
  return getPreferredItemInTag(ingredient.of(tag)).id == air;
}

function gear_unification(event, material, ingot, gem, gear) {
  if (gear == air) {
      return;
  }

  var output = gear,
      input,
      mold = 'immersiveengineering:mold_gear';

  if (ingot != air) {
      input = '#forge:ingots/' + material;
  } else if (gem != air) {
      input = '#forge:gems/' + material;
  } else {
      return;
  }

  event.recipes.immersiveengineering.metal_press(output, ingredient.of(input, 4), mold);
  event.shaped(gear, [' B ', 'BAB', ' B '], {
      A: '#forge:nuggets/iron',
      B: input
  });
}

function rod_unification(event, material, ingot, gem, rod) {
  if (rod == air) {
      return;
  }

  event.remove({ type: 'minecraft:crafting_shaped', output: rod });

  var output = item.of(rod, 2),
      input,
      mold = 'immersiveengineering:mold_rod';

  if (ingot != air) {
      input = '#forge:ingots/' + material;
  } else if (gem != air) {
      input = '#forge:gems/' + material;
  } else {
      return;
  }

  event.recipes.thermal.press(output, [input, mold]).energy(2400);
  event.recipes.immersiveengineering.metal_press(output, input, mold);
  event.shaped(output, [' A ', ' A ', '   '], {
      A: input
  });
}

const unificationBlacklist = [
  unificationBlacklistEntry('quartz', 'gem'),
  unificationBlacklistEntry('quartz', 'storage_block')
];