import

#!/usr/bin/env node
/* eslint-disable no-useless-escape */
'use strict';

// This script syncs the vendored submodules of smogon/pokemon-showdown and
// smogon/pokemon-showdown-client and highlights 'interesting' changes before performing several
// manipulations on the former to generate portions of the @pkmn/sim, @pkmn/mods, @pkmn/randoms and
// @pkmn/dex packages. Each of these packages involve some amount of handwritten code (which may be
// broken or become out of sync after running this script) in addition to code generated completely
// from Pokémon Showdown, and many of the other packages in this repository which have been 'hard'
// forked from Pokémon Showdown will possibly require manual intervention and updates after an
// import.
//
// This is the most 'HERE BE DRAGONS' and hacky code in the entire project, but is also the magic
// sauce™ that makes everything work. The fragile nature of this whole ordeal is slightly offset
// by the large amount of unit and integration tests - assume that whenever you run this script
// everything is broken unless `npm test:integration` and manual inspection suggests otherwise.

const child_process = require('child_process');
const fs = require('fs');
const path = require('path');
const util = require('util');

const stringify = require('json-stringify-pretty-compact');

const debug = process.argv[2] === '--debug';

const exec = async (cmd, cwd = __dirname) => new Promise(resolve => {
  child_process.exec(cmd, {cwd}, (error, stdout, stderr) => {
    resolve([error ? error.code : 0, stdout, stderr]);
  });
});

const IGNORE_STDERR = true;
const execOrDie = async (cmd, cwd = __dirname, ignoreStderr = !IGNORE_STDERR) => {
  const dir = path.relative(__dirname, cwd);
  console.log(dir ? `${cmd} \x1b[90m(${path.relative(__dirname, cwd)})\x1b[0m` : cmd);
  const [error, stdout, stderr] = await exec(cmd, cwd);
  if (error || (!ignoreStderr && stderr)) throw new Error(`exec error ${error}: ${stderr}`);
  return stdout;
};

const tree = root => {
  const leaves = [];
  for (const child of fs.readdirSync(root)) {
    if (['build', 'node_modules'].includes(child)) continue;
    const p = path.join(root, child);
    leaves.push(...(fs.lstatSync(p).isDirectory() ? tree(p) : [p]));
  }
  return leaves;
};

const replace = async (file, replacements, ignore) => {
  const stats = await fs.promises.lstat(file);
  if (stats.isSymbolicLink()) return;
  if (stats.isFile()) {
    if (!file.endsWith('.js') || ignore.has(file)) return;
    let text = await fs.promises.readFile(file, "utf8");
    let anyMatch = false;
    for (let i = 0; i < replacements.length; i++) {
      anyMatch = anyMatch || text.match(replacements[i].regex);
      if (anyMatch) text = text.replace(replacements[i].regex, replacements[i].replace, ignore);
    }
    if (!anyMatch) return;
    await fs.promises.writeFile(file, text);
  } else if (stats.isDirectory()) {
    const files = await fs.promises.readdir(file);
    const all = [];
    for (let i = 0; i < files.length; i++) {
      all.push(replace(path.join(file, files[i]), replacements, ignore));
    }
    await Promise.all(all);
  }
};

const ps = path.resolve(__dirname, 'vendor/pokemon-showdown');
const psc = path.resolve(__dirname, 'vendor/pokemon-showdown-client');
const sim = path.resolve(__dirname, 'sim');
const dex = path.resolve(__dirname, 'dex');
const view = path.resolve(__dirname, 'view');
const mods = path.resolve(__dirname, 'mods');
const randoms = path.resolve(__dirname, 'randoms');
const streams = path.resolve(__dirname, 'streams');

// > fucking hell zarle, friends don't let friends use globals :(
//
// The simulator relies internally on global ambient types which work to compile a standalone
// application but which are useless to downstream developers attempting to use this as a library as
// part of their own application. As such, we need to mirror and modify the `sim/global-types.ts`
// file to export all of its types *and* add imports to all of the files under `sim/` (ie. any `.ts`
// files depending on global types - the `data/` files are currently not required to have
// ///-references to work).
const IMPORTS = {
  'data/tags.ts': ['Species', 'Move', 'Item', 'Ability'],
  'sim/battle-actions.ts': [
    'Battle', 'ModdedDex', 'Pokemon', 'Effect', 'Move', 'ActiveMove',
    'Side', 'SpreadMoveTargets', 'SpreadMoveDamage', 'ZMoveOptions',
  ],
  'sim/battle-queue.ts': ['Pokemon', 'ID', 'Move', 'Effect'],
  'sim/battle-stream.ts': ['AnyObject', 'ModdedDex'],
  'sim/battle.ts': [
    'Effect', 'Format', 'ID', 'PlayerOptions', 'AnyObject', 'ActiveMove', 'SideID', 'StatsTable',
    'SparseBoostsTable', 'SpreadMoveDamage', 'Move', 'PokemonSet', 'GameType', 'ModdedDex',
    'PokemonSlot',
  ],
  'sim/dex-abilities.ts': [
    'AnyObject', 'Battle', 'Pokemon', 'Side', 'Field', 'ConditionData', 'ModdedDex', 'ID',
  ],
  'sim/dex-conditions.ts': [
    'AnyObject', 'Battle', 'Pokemon', 'Side', 'Field', 'Effect', 'ActiveMove', 'Item',
    'CommonHandlers', 'SparseBoostsTable', 'ModdedDex', 'ID',
  ],
  'sim/dex-data.ts': [
    'AnyObject', 'ID', 'SparseStatsTable', 'TypeData', 'NatureData', 'EffectType', 'Nonstandard',
    'EffectData', 'StatIDExceptHP', 'ModdedDex', 'StatID',
  ],
  'sim/dex-items.ts': [
    'AnyObject', 'Battle', 'Pokemon', 'SparseBoostsTable', 'ConditionData', 'CommonHandlers',
    'ModdedDex', 'ID',
  ],
  'sim/dex-moves.ts': [
    'AnyObject', 'ID', 'SparseBoostsTable', 'Pokemon', 'Ability', 'ConditionData', 'CommonHandlers',
    'EffectData', 'Battle', 'Side', 'Effect', 'ModdedDex', 'StatIDExceptHP',
  ],
  'sim/field.ts': ['Effect', 'Condition', 'Pokemon', 'Battle', 'Side', 'AnyObject', 'ID'],
  'sim/pokemon.ts': [
    'ActiveMove', 'Ability', 'Condition', 'Item', 'Species', 'SparseBoostsTable', 'Side', 'SideID',
    'AnyObject', 'DynamaxOptions', 'Move', 'StatIDExceptHP', 'Effect', 'StatsExceptHPTable', 'ID',
    'BoostsTable', 'StatsTable', 'GenderName', 'PokemonSet', 'Battle', 'PokemonSlot',
  ],
  'sim/side.ts': [
    'AnyObject', 'Effect', 'ActiveMove', 'Condition', 'PokemonSet', 'Battle',
    'Move', 'SideID', 'ID',
  ],
  'sim/state.ts': [
    'AnyObject', 'Condition', 'Ability', 'Item', 'Move', 'Species', 'ActiveMove',
  ],
  'sim/team-validator.ts': [
    'Format', 'StatsTable', 'SparseStatsTable', 'Species', 'AnyObject', 'Move',
    'EventInfo', 'PokemonSet', 'Ability', 'Item', 'ID', 'ModdedDex', 'Nature',
  ],
  'sim/tools/random-player-ai.ts': ['AnyObject'],
  'sim/tools/runner.ts': ['PokemonSet'],
};
const MOD_IMPORTS = {
  // gen1jpn
  'data/mods/gen1jpn/moves.ts': ['ModdedMoveData'],
  'data/mods/gen1jpn/rulesets.ts': ['ModdedFormatData'],
  'data/mods/gen1jpn/scripts.ts': ['ModdedBattleScriptsData'],

  // gen1stadium
  'data/mods/gen1stadium/conditions.ts': ['ModdedConditionData'],
  'data/mods/gen1stadium/moves.ts': ['ModdedMoveData', 'ActiveMove'],
  'data/mods/gen1stadium/rulesets.ts': ['ModdedFormatData'],
  'data/mods/gen1stadium/scripts.ts': [
    'ModdedBattleScriptsData', 'StatIDExceptHP', 'BoostID', 'ActiveMove',
  ],

  // gen2stadium2
  'data/mods/gen2stadium2/conditions.ts': [
    'ModdedConditionData', 'Battle', 'Pokemon', 'ActiveMove',
  ],
  'data/mods/gen2stadium2/items.ts': ['ModdedItemData'],
  'data/mods/gen2stadium2/moves.ts': ['ModdedMoveData'],
  'data/mods/gen2stadium2/rulesets.ts': ['ModdedFormatData'],
  'data/mods/gen2stadium2/scripts.ts': [
    'ModdedBattleScriptsData', 'ActiveMove', 'BoostID',
    'SparseBoostsTable', 'Pokemon', 'StatIDExceptHP',
  ],

  // gen4pt
  'data/mods/gen4pt/formats-data.ts': ['ModdedSpeciesFormatsData'],
  'data/mods/gen4pt/learnsets.ts': ['ModdedLearnsetData'],
  'data/mods/gen4pt/scripts.ts': ['ModdedBattleScriptsData'],

  // gen5bw1
  'data/mods/gen5bw1/formats-data.ts': ['ModdedSpeciesFormatsData'],
  'data/mods/gen5bw1/items.ts': ['ModdedItemData'],
  'data/mods/gen5bw1/learnsets.ts': ['ModdedLearnsetData'],
  'data/mods/gen5bw1/pokedex.ts': ['ModdedSpeciesData'],
  'data/mods/gen5bw1/scripts.ts': ['ModdedBattleScriptsData'],

  // gen6xy
  'data/mods/gen6xy/formats-data.ts': ['ModdedSpeciesFormatsData'],
  'data/mods/gen6xy/items.ts': ['ModdedItemData'],
  'data/mods/gen6xy/learnsets.ts': ['ModdedLearnsetData'],
  'data/mods/gen6xy/moves.ts': ['ModdedMoveData'],
  'data/mods/gen6xy/pokedex.ts': ['ModdedSpeciesData'],
  'data/mods/gen6xy/scripts.ts': ['ModdedBattleScriptsData'],

  // gen7letsgo
  'data/mods/gen7letsgo/formats-data.ts': ['ModdedSpeciesFormatsData'],
  'data/mods/gen7letsgo/learnsets.ts': ['ModdedLearnsetData'],
  'data/mods/gen7letsgo/moves.ts': ['ModdedMoveData'],
  'data/mods/gen7letsgo/pokedex.ts': ['ModdedSpeciesData'],
  'data/mods/gen7letsgo/scripts.ts': [
    'ModdedBattleScriptsData', 'StatsTable', 'StatID', 'Species', 'Battle',
  ],

  // gen7sm
  'data/mods/gen7sm/formats-data.ts': ['ModdedSpeciesFormatsData'],
  'data/mods/gen7sm/items.ts': ['ModdedItemData'],
  'data/mods/gen7sm/learnsets.ts': ['ModdedLearnsetData'],
  'data/mods/gen7sm/pokedex.ts': ['ModdedSpeciesData'],
  'data/mods/gen7sm/scripts.ts': ['ModdedBattleScriptsData'],

  // gen8bdsp
  'data/mods/gen8bdsp/abilities.ts': ['ModdedAbilityData'],
  'data/mods/gen8bdsp/formats-data.ts': ['ModdedSpeciesFormatsData'],
  'data/mods/gen8bdsp/items.ts': ['ModdedItemData'],
  'data/mods/gen8bdsp/learnsets.ts': ['ModdedLearnsetData'],
  'data/mods/gen8bdsp/moves.ts': ['ModdedMoveData'],
  'data/mods/gen8bdsp/pokedex.ts': ['ModdedSpeciesData'],
  'data/mods/gen8bdsp/rulesets.ts': ['ModdedFormatData'],
  'data/mods/gen8bdsp/scripts.ts': ['ModdedBattleScriptsData'],

  // gen8dlc1
  'data/mods/gen8dlc1/abilities.ts': ['ModdedAbilityData'],
  'data/mods/gen8dlc1/formats-data.ts': ['ModdedSpeciesFormatsData'],
  'data/mods/gen8dlc1/items.ts': ['ModdedItemData'],
  'data/mods/gen8dlc1/learnsets.ts': ['LearnsetData'],
  'data/mods/gen8dlc1/moves.ts': ['ModdedMoveData'],
  'data/mods/gen8dlc1/pokedex.ts': ['ModdedSpeciesData'],
  'data/mods/gen8dlc1/scripts.ts': ['ModdedBattleScriptsData'],

  // gen9predlc
  'data/mods/gen9predlc/abilities.ts': ['ModdedAbilityData'],
  'data/mods/gen9predlc/formats-data.ts': ['SpeciesFormatsData'],
  'data/mods/gen9predlc/items.ts': ['ModdedItemData'],
  'data/mods/gen9predlc/learnsets.ts': ['LearnsetData'],
  'data/mods/gen9predlc/moves.ts': ['ModdedMoveData'],
  'data/mods/gen9predlc/pokedex.ts': ['ModdedSpeciesData'],
  'data/mods/gen9predlc/scripts.ts': ['ModdedBattleScriptsData'],

  // gen9dlc1
  'data/mods/gen9dlc1/abilities.ts': ['ModdedAbilityData'],
  'data/mods/gen9dlc1/formats-data.ts': ['SpeciesFormatsData'],
  'data/mods/gen9dlc1/items.ts': ['ModdedItemData'],
  'data/mods/gen9dlc1/learnsets.ts': ['LearnsetData'],
  'data/mods/gen9dlc1/moves.ts': ['ModdedMoveData'],
};
const RANDOMS_IMPORTS = {
  'data/random-battles/gen9/teams.ts': [
    [['Utils'], './utils'],
    [[
      'PlayerOptions', 'PRNG', 'PRNGSeed', 'PokemonSet', 'StatsTable', 'StatID',
      'Format', 'Species', 'RandomTeamsTypes', 'toID', 'ModdedDex', 'Move', 'BasicEffect',
      'RuleTable', 'Tags', 'Item', 'Ability', 'Nature',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen8/teams.ts': [
    [['Utils'], './utils'],
    [[
      'AnyObject', 'PlayerOptions', 'PRNG', 'PRNGSeed', 'PokemonSet', 'StatsTable', 'StatID',
      'Format', 'Species', 'RandomTeamsTypes', 'toID', 'ModdedDex', 'Move', 'BasicEffect',
      'RuleTable', 'Tags', 'Item', 'Ability', 'Nature', 'ID',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen7/teams.ts': [
    [['MoveCounter', 'RandomGen8Teams', 'TeamData'], './gen8'],
    [['Utils'], './utils'],
    [[
      'ModdedDex', 'AnyObject', 'PlayerOptions', 'PRNG', 'PRNGSeed', 'StatID', 'Ability',
      'Format', 'Species', 'RandomTeamsTypes', 'toID', 'Move', 'StatsTable', 'SparseStatsTable',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen6/teams.ts': [
    [['RandomGen7Teams', 'ZeroAttackHPIVs', 'BattleFactorySpecies'], './gen7'],
    [['MoveCounter', 'TeamData'], './gen8'],
    [['Utils'], './utils'],
    [[
      'ModdedDex', 'AnyObject', 'PlayerOptions', 'PRNG', 'PRNGSeed',
      'Format', 'Species', 'RandomTeamsTypes', 'toID', 'StatID', 'Ability',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen5/teams.ts': [
    [['MoveCounter'], './gen8'],
    [['RandomGen6Teams'], './gen6'],
    [['Utils'], './utils'],
    [[
      'Species', 'StatID', 'RandomTeamsTypes', 'toID',
      'ModdedDex', 'Format', 'PRNG', 'PRNGSeed', 'Ability',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen4/teams.ts': [
    [['MoveCounter'], './gen8'],
    [['RandomGen5Teams'], './gen5'],
    [['Utils'], './utils'],
    [[
      'Species', 'RandomTeamsTypes', 'StatID',
      'ModdedDex', 'Format', 'PRNG', 'PRNGSeed', 'Ability',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen3/teams.ts': [
    [['MoveCounter'], './gen8'],
    [['RandomGen4Teams'], './gen4'],
    [['Utils'], './utils'],
    [[
      'ModdedDex', 'PRNG', 'PRNGSeed', 'Format', 'Species', 'RandomTeamsTypes', 'StatID',
      'Ability',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen2/teams.ts': [
    [['MoveCounter'], './gen8'],
    [['RandomGen3Teams'], './gen3'],
    [[
      'ModdedDex', 'PRNG', 'PRNGSeed', 'Format', 'Species', 'RandomTeamsTypes', 'StatID',
    ], '@pkmn/sim'],
  ],
  'data/random-battles/gen1/teams.ts': [
    [['MoveCounter'], './gen8'],
    [['RandomGen2Teams'], './gen2'],
    [['Utils'], './utils'],
    [[
      'ID', 'Species', 'RandomTeamsTypes', 'Move', 'StatsTable', 'StatID', 'PokemonSet',
    ], '@pkmn/sim'],
  ],
};

const TYPES = new Set([
  'Normal', 'Fighting', 'Flying', 'Poison', 'Ground', 'Rock', 'Bug', 'Ghost', 'Steel',
  'Fire', 'Water', 'Grass', 'Electric', 'Psychic', 'Ice', 'Dragon', 'Dark', 'Fairy',
]);

const imports = (types, where, typeOnly = false) => {
  types.sort();
  const importStatement = typeOnly ? 'import type' : 'import';
  if (types.length <= 5) return `${importStatement} {${types.join(', ')}} from '${where}';\n\n`;
  return `${importStatement} {\n\t${types.join(',\n\t')},\n} from '${where}';\n\n`;
};

const KEY = `\t\treturn this.getByID(name.startsWith('item:') || ` +
  `name.startsWith('ability:') ? name as ID : toID(name));`;
/* eslint-disable no-template-curly-in-string */
const VALUE =
  "\t\tconst special = name.startsWith('item:') ? `item:${toID(name.slice(5))}` as ID :\n" +
  "\t\t\tname.startsWith('ability:') ? `ability:${toID(name.slice(8))}` as ID :\n" +
  "\t\t\tname.startsWith('move:') ? `move:${toID(name.slice(5))}` as ID : undefined;\n" +
  "\t\treturn this.getByID(special || toID(name));";
const REWRITES = {
  'sim/side.ts': {
    '\tgetRequestData() {':
      '\tgetRequestData(): {id: SideID, name: string, pokemon: AnyObject[]} {',
  },
  'sim/pokemon.ts': {
    '\tgetHealth = () => {':
      '\tgetHealth = (): {side: SideID, secret: string, shared: string} => {',
    '\tgetDetails = () => {':
      '\tgetDetails = (): {side: SideID, secret: string, shared: string} => {',
  },
  'sim/dex-abilities.ts': {
    '\t\tif (ability.exists) this.abilityCache.set(id, this.dex.deepFreeze(ability));':
      `\t\tif (!(ability as any).kind) (ability as any).kind = 'Ability';\n` +
      '\t\tif (ability.exists) this.abilityCache.set(id, ability);',
  },
  'sim/dex-conditions.ts': {
    '\t\t} else if (this.dex.data.Rulesets.hasOwnProperty(id)) {':
      `\t\t} else if (id.startsWith('move:')) {\n` +
      '\t\t\tconst move = this.dex.moves.getByID(id.slice(5) as ID);\n' +
      `\t\t\tcondition = move as any as Condition;\n` +
      '\t\t} else if (this.dex.data.Rulesets.hasOwnProperty(id)) {',
    "\t\t\tcondition = {...item, id: 'item:' + item.id as ID} as any as Condition;":
      '\t\t\tcondition = item as any as Condition;',
    "\t\t\tcondition = {...ability, id: 'ability:' + ability.id as ID} as any as Condition;":
      '\t\t\tcondition = ability as any as Condition;',
    "\t\tthis.conditionCache.set(id, this.dex.deepFreeze(condition));":
      '\t\tthis.conditionCache.set(id, condition);',
    [KEY]: VALUE,
  },
  'sim/dex-items.ts': {
    '\t\tif (item.exists) this.itemCache.set(id, this.dex.deepFreeze(item));':
      `\t\t(item as any).kind = 'Item';\n` +
      '\t\tif (item.exists) this.itemCache.set(id, item);',
  },
  'sim/dex-moves.ts': {
    '\t\tif (move.exists) this.moveCache.set(id, this.dex.deepFreeze(move));':
      `\t\t(move as any).kind = 'Move';\n` +
      '\t\tif (move.exists) this.moveCache.set(id, move);',
  },
  'sim/dex-data.ts': {
    '\t\tif (nature.exists) this.natureCache.set(id, this.dex.deepFreeze(nature));':
      `\t\t(nature as any).kind = 'Nature';\n` +
      '\t\tif (nature.exists) this.natureCache.set(id, nature);',
    '\t\tif (type.exists) this.typeCache.set(id, this.dex.deepFreeze(type));':
      `\t\t(type as any).kind = 'Type';\n` +
      '\t\tif (type.exists) this.typeCache.set(id, type);',
  },
  'sim/battle.ts': {
    '\tgetCategory(move: string | Move) {':
      '\tgetCategory(move: string | Move): Move[\'category\'] {',
    '\t\t\tconst entry = this.dex.data.Scripts[i];':
      '\t\t\tconst entry = (this.dex.data.Scripts as any)[i];',
    '\t\treturn team as PokemonSet[];': '\t\treturn team;',
    '\tconstructor(options: BattleOptions) {': '\tconstructor(options: BattleOptions, dex = Dex) {',
    '\t\tconst format = options.format || Dex.formats.get(options.formatid, true);':
      '\t\tconst format = options.format || dex.formats.get(options.formatid, true);',
    '\t\tthis.dex = Dex.forFormat(format);': '\t\tthis.dex = dex.forFormat(format);',
    "\t\t\t\t\tnewSet.species = Dex.species.get(set.species + 'crowned').name;":
      "\t\t\t\t\tnewSet.species = this.dex.species.get(set.species + 'crowned').name;",
  },
  // smfh Zarle, please learn how Promises work
  'sim/battle-stream.ts': {
    '\t\tvoid this._listen();': undefined,
    '\tasync _listen() {': '\tasync start() {',
    "import {Battle, extractChannelMessages} from './battle';":
      "import {Battle, extractChannelMessages} from './battle';\nimport {Dex} from './dex';",
    '\tbattle: Battle | null;': '\tbattle: Battle | null;\n\tdex: ModdedDex;',
    '\t\t\tthis.battle = new Battle(options);':
      '\t\t\tthis.battle = new Battle(options, this.dex);',
    '\t} = {}) {': '\t} = {}, dex = Dex) {',
    '\t\tthis.battle = null;': '\t\tthis.battle = null;\n\t\tthis.dex = dex;',
  },
  'sim/team-validator.ts': {
    '\t\t\t\ttestTeamGenerator.getTeam(options); // Throws error if generation fails':
      '\t\t\t\ttestTeamGenerator.getTeam(options as any); // Throws error if generation fails',
  },
};

// All the files in our sim/ directory, excluding build/ & node_modules/ & test/sim/
const FILES = new Set(tree(sim)
  .map(m => m.slice(sim.length + 1))
  .filter(f => !f.startsWith('test/sim')));
const MOD_FILES =
  new Set(tree(path.join(mods, 'src')).map(m => `data/mods/${m.slice(mods.length + 5)}`));

// Files which need special attention if changed (usually manual intervention)
const FRAGILE = new Set([
  'sim/dex-abilities.ts',
  'sim/dex-conditions.ts',
  'sim/dex-data.ts',
  'sim/dex-items.ts',
  'sim/dex-moves.ts',
  'sim/dex-species.ts',
  'sim/dex-formats.ts',
  // `sim/dex.ts` has to have its loading reworked to depend on everything up front so that it can
  // be used in a browser environment where synchronous `require` and `fs` APIs don't exist.
  'sim/dex.ts',
  'sim/global-types.ts',
  'sim/global-variables.d.ts',
]);
// Files which we want to prevent being copied over from PS, either because of modifications or
// because they only exist in the generated package
const OVERRIDDEN = new Set([
  ...Array.from(FRAGILE).slice(5), // most sim/dex-*.ts have *not* been overridden
  '.eslintcache',
  '.eslintrc-no-types.json',
  '.eslintrc-types.json',
  '.eslintrc',
  '.tsbuildinfo',
  'config/formats.ts',
  'data/index.ts',
  'data/mods/gen1/index.ts',
  'data/mods/gen2/index.ts',
  'data/mods/gen3/index.ts',
  'data/mods/gen4/index.ts',
  'data/mods/gen5/index.ts',
  'data/mods/gen6/index.ts',
  'data/mods/gen7/index.ts',
  'data/mods/gen8/index.ts',
  'data/rulesets.ts',
  'data/mods/gen1/rulesets.ts',
  'data/mods/gen8/rulesets.ts',
  'data/learnsets.ts',
  'data/mods/gen2/learnsets.ts',
  'data/mods/gen6/learnsets.ts',
  'data/mods/gen8/learnsets.ts',
  'data/legality.ts',
  'data/mods/gen2/legality.ts',
  'data/mods/gen6/legality.ts',
  'data/mods/gen8/legality.ts',
  'lib/index.ts',
  'lib/streams.ts',
  'package-lock.json', // double sigh...
  'package.json',
  'pnpm-debug.log', // sigh...
  'README.md',
  'sim/dex-formats.ts',
  'sim/exported-global-types.ts',
  'sim/index.ts',
  'sim/teams.ts',
  'sim/tools/exhaustive-runner.ts',
  'sim/tools/index.ts',
  'test/main.js',
  'test/sim/rulesets.js',
  'test/sim/team-validator/basic.js',
  'test/sim/team-validator/formes.js',
  'tsconfig.json',
]);
const MOD_OVERRIDDEN = new Set([
  'data/mods/gen1jpn/index.ts',
  'data/mods/gen1stadium/index.ts',
  'data/mods/gen2stadium2/index.ts',
  'data/mods/gen4pt/index.ts',
  'data/mods/gen5bw1/index.ts',
  'data/mods/gen6xy/index.ts',
  'data/mods/gen7letsgo/index.ts',
  'data/mods/gen7sm/index.ts',
  'data/mods/gen8bdsp/index.ts',
  'data/mods/gen8dlc1/index.ts',
  'data/mods/gen9predlc/index.ts',
  'data/mods/gen9dlc1/index.ts',
  'data/mods/index.test.ts',
  'data/mods/index.ts',
]);
const SKIP_TESTS = new Set([
  'test/sim/data.js',
  'test/sim/misc/mixandmega.js',
  'test/sim/misc/megaevolution.js',
  'test/sim/misc/statuses.js',
  'test/sim/moves/counter.js',
  'test/sim/prng.js',
  'test/sim/state.js',
  'test/sim/tools/multi-random-runner.js',
  'test/sim/misc/inversebattle.js',
]);
// Any file that hasn't been 'OVERRIDDEN' we need to copy over from PS
const COPIED = new Set([...FILES].filter(f => !OVERRIDDEN.has(f)));
const MOD_COPIED = new Set([...MOD_FILES].filter(f => !MOD_OVERRIDDEN.has(f)));

// Files which are relevant for review in smogon/pokemon-showdown-client
const INTERESTING = new Set([
  'build',
  'build-tools/build-indexes',
  'js/storage.js',
  'src/battle-choices.ts',
  'src/battle-dex-data.ts',
  'src/battle-dex.ts',
  'src/battle-scene-stub.ts',
  'src/battle-text-parser.ts',
  'src/battle.ts',
]);

// Pretty much all changes within sim/ and data/ are interesting to review, whether copied or not.
// This mostly exists to help detect when *new* files are added which may need to be included
const interesting = f => {
  if (f.startsWith('sim') || f.startsWith('test/sim')) return true;
  if (f.startsWith('data') && !f.endsWith('teams.ts')) return true;
  return COPIED.has(f) || MOD_COPIED.has(f);
};

const removeFields = (data, fields) => {
  data = JSON.parse(JSON.stringify(data));
  for (const id in data) {
    for (const field of fields) delete data[id][field];
  }
  return data;
};

const RANDOMS_FILES = {
  'data/random-battles/gen9/teams.ts': 'src/gen9.ts',
  'data/random-battles/gen8/teams.ts': 'src/gen8.ts',
  'data/random-battles/gen7/teams.ts': 'src/gen7.ts',
  'data/random-battles/gen6/teams.ts': 'src/gen6.ts',
  'data/random-battles/gen5/teams.ts': 'src/gen5.ts',
  'data/random-battles/gen4/teams.ts': 'src/gen4.ts',
  'data/random-battles/gen3/teams.ts': 'src/gen3.ts',
  'data/random-battles/gen2/teams.ts': 'src/gen2.ts',
  'data/random-battles/gen1/teams.ts': 'src/gen1.ts',
};

const INLINE_REQUIRE = /^(.*)require\(.*\);.*$/;
const RANDOM_SETS = /^(\trandomSets:.*=) require\('\.\/sets\.json'\);(.*)/;
const RANDOM_DOUBLES_SETS =
  /^(\trandomDoublesSets:.*=) require\('\.\/doubles-sets\.json'\);(.*)/;
const RANDOM_DATA = /^(\trandomData:.*=) require\('\.\/data\.json'\);(.*)/;

const DATA = {
  'abilities.js': code => [
    removeFields(code.Abilities, ['rating']), 'abilities.json', (d, gen, data) => {
      // Pokémon Showdown changed its text inheritance in smogon/pokemon-showdown@ea8f52ce to work
      // independently of its normal `inherit: true` scheme, meaning certain data fields need to be
      // patched to paper over the difference.
      if (gen === 4) {
        d['hydration'].desc = data[7]['hydration'].desc;
        d['hydration'].shortDesc = data[9]['hydration'].shortDesc;
        d['simple'].desc = data[6]['simple'].desc;
        d['thickfat'].desc = data[9]['thickfat'].desc;
      }
    },
  ],
  'aliases.js': code => [code.Aliases, 'aliases.json'],
  'conditions.js': code => [code.Conditions, 'conditions.json'],
  'formats-data.js': code => [removeFields(code.FormatsData, ['natDexTier']), 'formats-data.json'],
  'items.js': code => [removeFields(code.Items, ['spritenum']), 'items.json'],
  'learnsets.js': code => [code.Learnsets, 'learnsets.json'],
  'moves.js': code => [removeFields(code.Moves, ['contestType']), 'moves.json'],
  'natures.js': code => [code.Natures, 'natures.json'],
  'pokedex.js': code => [removeFields(code.Pokedex, ['color', 'heightm']), 'species.json'],
  'typechart.js': code => {
    for (const id in code.TypeChart) {
      for (const type2 in code.TypeChart[id].damageTaken) {
        if (!TYPES.has(type2)) {
          delete code.TypeChart[id].damageTaken[type2];
        }
      }
    }
    return [code.TypeChart, 'types.json'];
  },
};

const fillDescs = (text, gen, contents) => {
  for (const id in text) {
    if (!contents[id] && gen === 9) continue;
    const d = gen === 9 ? text[id] : text[id][`gen${gen}`];
    const desc = d && d.desc;
    if (desc) {
      contents[id] = contents[id] || {inherit: true};
      contents[id].desc = desc;
    }
    const sd = gen === 9 ? text[id] : text[id][`gen${gen}`];
    const shortDesc = sd && sd.shortDesc;
    if (shortDesc) {
      contents[id] = contents[id] || {inherit: true};
      contents[id].shortDesc = shortDesc;
    }
  }

  return contents;
};

// Yes, this is obviously fragile AF, thanks for noticing
const rewrite = (original, fn) => {
  const rewritten = [];
  for (const line of original.split('\n')) {
    const rline = fn(line);
    if (rline !== undefined) rewritten.push(rline);
  }
  return rewritten.join('\n');
};

const HEAD = async where => (await execOrDie('git rev-parse HEAD', where)).slice(0, 8);
// Figure out what has changed in PS so that we can later filter out just the interesting changes
// A GitHub URL for the diff is added for convenience in the event review is required
const changes = async (where, last, now, repo) => ({
  files: (await execOrDie(`git diff --name-only ${last}..${now}`, where)).trim().split('\n'),
  url: `https://github.com/smogon/${repo}/compare/${last}..${now}`,
});

(async () => {
  const last = {ps: await HEAD(ps), psc: await HEAD(psc)};
  try {
    // `git -C vendor/pokemon-showdown pull origin master` etc works for individual submodules, but
    // this command will update both repositories at once
    if (!debug) await execOrDie('git submodule update --remote --rebase', __dirname, IGNORE_STDERR);
    const now = {ps: await HEAD(ps), psc: await HEAD(psc)};

    const changed = {
      ps: await changes(ps, last.ps, now.ps, 'pokemon-showdown'),
      psc: await changes(psc, last.psc, now.psc, 'pokemon-showdown-client'),
    };

    console.log(`\n${changed.ps.url}\n`);
    for (const change of changed.ps.files) {
      let color = 0;
      if (/random|formats-data/.test(change)) {
        color = 95; // magenta
      } else if (interesting(change)) {
        // Even though we copy over `sim/global-types.ts` untouched, any changes to it will have a
        // large effect on whether we're able to build an acceptable package
        color = (FRAGILE.has(change) || change === 'sim/global-types.ts')
          ? 91 // red -> yellow -> lightblue
          : OVERRIDDEN.has(change) ? 93 : 96;
      }
      if (color) console.log(`\x1b[${color}mCHANGED\x1b[0m ${change}`);
    }

    console.log(`\n${changed.psc.url}\n`);
    for (const change of changed.psc.files) {
      if (INTERESTING.has(change)) {
        console.log(`\x1b[${change.startsWith('build') ? 91 : 96}mCHANGED\x1b[0m ${change}`);
      }
    }

    const index = fs.readFileSync(path.resolve(ps, 'lib/streams.ts'), 'utf8').replace(
      'Documented in STREAMS.md.', 'Documentation can be found at\n' +
      ' * https://github.com/smogon/pokemon-showdown/blob/master/lib/STREAMS.md'
    ).replace('let options;', 'let options: any;');
    // double fuck you zarle, AnyObject is a dreadful hack to begin with, feel ashamed
    fs.writeFileSync(path.resolve(streams, 'index.ts'),
      `interface AnyObject {[k: string]: any}\n${index}`);
    fs.writeFileSync(path.resolve(sim, 'lib/streams.ts'), `export * from "@pkmn/streams";\n`);

    // Copy the files over, generating an 'import' statement for those that need it
    for (const file of COPIED) {
      if (IMPORTS[file]) {
        // Handling arbitrary relative imports is overkill right now, bail
        if (!file.startsWith('sim/') && file !== 'data/tags.ts') {
          throw new Error('Unsupported import location');
        }
        const prefix = file.startsWith('data') ? '../sim'
          : file.startsWith('sim/tools/') ? '..' : '.';
        const original = fs.readFileSync(path.resolve(ps, file), 'utf8');
        let rewritten = REWRITES[file]
          ? rewrite(original, line => line in REWRITES[file] ? REWRITES[file][line] : line)
          : original;
        if (file.startsWith('sim/dex-')) {
          rewritten = rewritten.replaceAll(/Object.freeze\((.*)\)/g, (_, $1) => $1);
        }
        fs.writeFileSync(path.resolve(sim, file),
          `${imports(IMPORTS[file], prefix + '/exported-global-types')}${rewritten}`);
      } else {
        fs.copyFileSync(path.resolve(ps, file), path.resolve(sim, file));
      }
    }

    for (const file of tree(path.join(ps, 'test/sim')).map(f => f.slice(ps.length + 1))) {
      if (OVERRIDDEN.has(file) || SKIP_TESTS.has(file)) continue;
      fs.copyFileSync(path.resolve(ps, file), path.resolve(sim, file));
    }
    for (const file of
      tree(path.join(ps, 'test/random-battles')).map(f => f.slice(ps.length + 1))) {
      fs.copyFileSync(path.resolve(ps, file), path.resolve(sim, file));
    }

    for (const file of MOD_COPIED) {
      if (MOD_IMPORTS[file]) {
        if (!file.startsWith('data/')) throw new Error('Unsupported import location');
        let original = fs.readFileSync(path.resolve(ps, file), 'utf8');
        if (file === 'data/mods/gen1jpn/rulesets.ts') {
          original = original.replace('} else if (set.level < legalityList[moveid]) {',
            '} else if (set.level < (legalityList[moveid] as number)) {');
        }
        fs.writeFileSync(path.resolve(mods, file.replace('data/mods', 'src')),
          `${imports(MOD_IMPORTS[file], '@pkmn/sim', true)}${original}`);
      } else if (!file.endsWith('formats.ts')) {
        fs.copyFileSync(
          path.resolve(ps, file), path.resolve(mods, file.replace('data/mods', 'src'))
        );
      }
    }

    // Unspeakable acts occur below, this is effectively "why we have tests" in a nutshell
    for (const file in RANDOMS_FILES) {
      // Sadly, we need to go through each of these line-by-line :( very sigh
      const original = fs.readFileSync(path.resolve(ps, file), 'utf8');
      const header = [];
      if (RANDOMS_IMPORTS[file]) {
        for (const [type, where] of RANDOMS_IMPORTS[file]) {
          header.push(imports(type, where).trim());
        }
      }

      const rewritten = rewrite(original, line => {
        if (line.startsWith('import')) return undefined;
        let m = RANDOM_DATA.exec(line);
        if (m) return `${m[1]} randomDataJSON;${m[2]}`;
        m = RANDOM_SETS.exec(line);
        if (m) return `${m[1]} randomSetsJSON;${m[2]}`;
        m = RANDOM_DOUBLES_SETS.exec(line);
        if (m) return `${m[1]} randomDoublesSetsJSON;${m[2]}`;
        m = INLINE_REQUIRE.exec(line);
        if (m) return `${m[1]}{};`;
        // Bless me, Father, for I have sinned...
        if (line.startsWith('\tconstructor(format:')) {
          return '\tconstructor(dex: ModdedDex, format: Format, prng: PRNG | PRNGSeed | null) {';
        } else if (line === '\t\tsuper(format, prng);') {
          return '\t\tsuper(dex, format, prng);';
        } else if (line === '\t\tformat = Dex.formats.get(format);') {
          return undefined;
        } else if (line === '\t\tthis.dex = Dex.forFormat(format);') {
          return '\t\tthis.dex = dex;';
        // eslint-disable-next-line max-len
        } else if (line === '\t\t\t\t\tmovePool, moves, abilities, types, counter, species as Species, teamDetails') {
          return '\t\t\t\t\tmovePool, moves, abilities, types, counter, species, teamDetails';
        }
        return line.replace(/Dex\./g, 'this.dex.');
      });

      let dataJson = '';
      let doublesJson = '';
      if (file.endsWith('teams.ts')) {
        const current = file.includes('gen9');
        const sets = file === 'data/random-battles/gen9/teams.ts' ||
          file === 'data/random-battles/gen7/teams.ts' ||
          file === 'data/random-battles/gen6/teams.ts' ||
          file === 'data/random-battles/gen5/teams.ts' ||
          file === 'data/random-battles/gen4/teams.ts' ||
          file === 'data/random-battles/gen3/teams.ts' ||
          file === 'data/random-battles/gen2/teams.ts';
        let data =
          path.resolve(path.join(ps, file), '..', `${sets ? 'sets' : 'data'}.json`);
        let raw = fs.readFileSync(data, 'utf8');
        dataJson = '\n\n/* eslint-disable */\n' +
          `const random${sets ? 'Sets' : 'Data'}JSON = ${JSON.stringify(JSON.parse(raw))}` +
          ' as any;\n/* eslint-enable */';
        if (sets && current) {
          data = path.resolve(path.join(ps, file), '..', `doubles-sets.json`);
          raw = fs.readFileSync(data, 'utf8');
          doublesJson = '\n\n/* eslint-disable */\n' +
            `const randomDoublesSetsJSON = ${JSON.stringify(JSON.parse(raw))}` +
            ' as any;\n/* eslint-enable */';
        }
      }

      fs.writeFileSync(
        path.resolve(randoms, RANDOMS_FILES[file]),
        `${header.join('\n')}${dataJson}${doublesJson}\n${rewritten}`
      );
    }

    // The data files are Typescript, so we need to build to convert them to JS before requiring
    await execOrDie(`node build`, ps);

    const TEXTS = {
      'moves.json': require(path.resolve(ps, 'dist/data/text/moves.js')).MovesText,
      'abilities.json': require(path.resolve(ps, 'dist/data/text/abilities.js')).AbilitiesText,
      'items.json': require(path.resolve(ps, 'dist/data/text/items.js')).ItemsText,
      // 'species.json': require(path.resolve(ps, 'dist/data/text/pokedex.js')).PokedexText,
    };

    const DEX = {};
    for (let gen = 9; gen >= 1; gen--) {
      let dir = path.join(ps, 'dist/data');
      if (gen !== 9) dir = path.join(dir, `mods/gen${gen}`);
      for (const file of fs.readdirSync(dir)) {
        const fn = DATA[path.basename(file)];
        if (fn) {
          const [contents, basename, patch] = fn(require(path.resolve(dir, file)));
          DEX[basename] = DEX[basename] || {};
          if (patch) patch(contents, gen, DEX[basename]);
          const text = TEXTS[basename];
          DEX[basename][gen] = text ? fillDescs(text, gen, contents) : contents;
        }
      }
    }

    const DefaultText = require(path.resolve(ps, 'dist/data/text/default.js')).DefaultText;
    const TEXT = {};
    for (const key in DefaultText) {
      if (key === 'sandstorm') {
        DefaultText[key].weatherName = 'Sand';
      } else if (key === 'desolateland') {
        DefaultText[key].weatherName = 'Harsh Sunshine';
      }

      TEXT[key === 'default' ? '_' : key] = DefaultText[key];
    }
    for (const text in TEXTS) {
      for (const id in TEXTS[text]) {
        const entry = TEXTS[text][id];
        for (const key in entry) {
          if (['name', 'desc', 'shortDesc'].includes(key)) continue;
          TEXT[id] = TEXT[id] || {};
          if (key.startsWith('gen')) {
            for (const modKey in entry[key]) {
              if (['desc', 'shortDesc'].includes(modKey)) continue;
              TEXT[id][modKey + 'Gen' + key.charAt(3)] = entry[key][modKey];
            }
          } else {
            TEXT[id][key] = entry[key];
          }
        }
        if (TEXT[id] && !Object.keys(TEXT[id]).length) delete TEXT[id];
      }
    }
    fs.writeFileSync(path.join(view, 'src/data/text.json'), stringify(TEXT));

    for (const basename in DEX) {
      const data = basename === 'aliases.json' ? DEX[basename][9] : DEX[basename];
      fs.writeFileSync(path.join(dex, 'data', basename), stringify(data));
    }

    const inspect = s =>
      util.inspect(s, {
        colors: false,
        depth: Infinity,
        maxArrayLength: Infinity,
        maxStringLength: Infinity,
        breakLength: 100,
      });

    // Prune config/formats.ts
    const formats = [];
    const modded = {};
    const remove = ['rated', 'challengeShow', 'searchShow', 'tournamentShow', 'threads', 'desc'];
    for (const format of require(path.resolve(ps, 'dist/config/formats.js')).Formats) {
      if (!format.mod) continue;
      const m = /^gen\d(.*)$/.exec(format.mod);
      if (!m) continue;
      if (format.ruleset.some(r => r.includes('Draft')) ||
        format.ruleset.includes('Standard OMs')) {
        continue;
      }
      if (Object.values(format).some(v => typeof v === 'function')) continue;
      if (format.battle && !format.name.includes('Custom Game')) continue;
      if (m[1]) {
        modded[format.mod] = modded[format.mod] || [];
        modded[format.mod].push(format);
        continue;
      }
      for (const field of remove) delete format[field];
      formats.push(format);
    }
    fs.writeFileSync(path.resolve(sim, 'config/formats.ts'),
      `export const Formats: FormatList = ${inspect(formats).replaceAll(
        'trunc: [Function: trunc]',
        'trunc: Math.trunc'
      )};\n`);
    for (const id in modded) {
      fs.writeFileSync(path.resolve(mods, `src/${id}/formats.ts`),
        `/* eslint-disable */\n\nexport const Formats = ${inspect(modded[id])};\n`);
    }

    // Decompose learnsets into learnsets.ts with just the learnset and legality.ts with the rest
    for (const dir of ['mods/gen2/', 'mods/gen6/', 'mods/gen8/', '/']) {
      const original = require(path.resolve(ps, `dist/data/${dir}learnsets.js`)).Learnsets;
      const learnsets = {};
      const legality = {};
      for (const id in original) {
        for (const key in original[id]) {
          if (key === 'learnset') {
            const regular = {};
            const special = {};
            for (const move in original[id][key]) {
              for (const source of original[id][key][move]) {
                if (source.includes('S')) {
                  special[move] = special[move] || [];
                  special[move].push(source);
                } else {
                  regular[move] = regular[move] || [];
                  regular[move].push(source);
                }
              }
            }
            // Simplify our merge algorithm by including every id from the original regardless
            learnsets[id] = learnsets[id] || {};
            learnsets[id][key] = regular;
            // Only a subset of Pokémon have event movepools
            if (Object.keys(special).length) {
              legality[id] = legality[id] || {};
              legality[id][key] = special;
            }
          } else {
            learnsets[id] = learnsets[id] || {};
            legality[id] = legality[id] || {};
            legality[id][key] = original[id][key];
          }
        }
      }
      fs.writeFileSync(path.resolve(sim, `data/${dir}learnsets.ts`),
        `export const Learnsets: {[k: string]: ModdedLearnsetData} = ${inspect(learnsets)};\n`);
      fs.writeFileSync(path.resolve(sim, `data/${dir}legality.ts`),
        `export const Legality: {[k: string]: ModdedLearnsetData} = ${inspect(legality)};\n`);
    }

    // Mirror `sim/global-types.ts` to export all of its types (making it a module). Its possible
    // that ///-references could also be added to the data/ files and *nothing* then relies on
    // ambient declarations, but this hack is the least involved way to get things to work
    const types = fs.readFileSync(path.resolve(ps, 'sim/global-types.ts'), 'utf8');
    fs.writeFileSync(path.resolve(sim, 'sim/global-types.ts'), types);
    const exported = [];
    for (const line of types.split('\n')) {
      exported.push(/^(type|interface|namespace)/.test(line) ? `export ${line}` : line);
    }
    fs.writeFileSync(path.resolve(sim, 'sim/exported-global-types.ts'), exported.join('\n'));

    // The test files require paths are made with PS's build layout in mind - correct that here
    const ignore = new Set([...Array.from(OVERRIDDEN).map(f => path.join(sim, f))]);
    await replace(path.join(sim, 'test'), [{
      regex: new RegExp(`(require\\\(.*?)dist\\\/((?<!build\\\/)sim)(.*?\\\))`, 'g'),
      replace: `$1build/cjs/sim$3`,
    }, {
      regex: new RegExp(`(require\\\(.*?)dist\\\/((?<!build\\\/)lib)(.*?\\\))`, 'g'),
      replace: `$1build/cjs/lib$3`,
    }], ignore);

    const messages =
      `-m "Import smogon/pokemon-showdown@${now.ps}" ` +
      `-m "smogon/pokemon-showdown-client@${now.psc}"`;
    console.log(`\ngit add -A && git commit ${messages}`);
  } catch (err) {
    await execOrDie(`git reset --hard ${last.ps}`, ps);
    await execOrDie(`git reset --hard ${last.psc}`, psc);
    console.error(err);
    process.exit(1);
  }
})().catch(err => {
  console.log(err);
  process.exit(2);
});