'use strict';

var object = require('./object.js');
var equality = require('./trait/equality.js');

/**
 * Common functions and function call helpers.
 *
 * @module function
 */


/**
 * Calls all functions in `fs` with args. Only throws after all functions were called.
 *
 * @param {Array<function>} fs
 * @param {Array<any>} args
 */
const callAll = (fs, args, i = 0) => {
  try {
    for (; i < fs.length; i++) {
      fs[i](...args);
    }
  } finally {
    if (i < fs.length) {
      callAll(fs, args, i + 1);
    }
  }
};

/**
 * @template A
 *
 * @param {A} a
 * @return {A}
 */
const id = a => a;

/* c8 ignore start */

/**
 * @param {any} a
 * @param {any} b
 * @return {boolean}
 */
const equalityDeep = (a, b) => {
  if (a === b) {
    return true
  }
  if (a == null || b == null || (a.constructor !== b.constructor && (a.constructor || Object) !== (b.constructor || Object))) {
    return false
  }
  if (a[equality.EqualityTraitSymbol] != null) {
    return a[equality.EqualityTraitSymbol](b)
  }
  switch (a.constructor) {
    case ArrayBuffer:
      a = new Uint8Array(a);
      b = new Uint8Array(b);
    // eslint-disable-next-line no-fallthrough
    case Uint8Array: {
      if (a.byteLength !== b.byteLength) {
        return false
      }
      for (let i = 0; i < a.length; i++) {
        if (a[i] !== b[i]) {
          return false
        }
      }
      break
    }
    case Set: {
      if (a.size !== b.size) {
        return false
      }
      for (const value of a) {
        if (!b.has(value)) {
          return false
        }
      }
      break
    }
    case Map: {
      if (a.size !== b.size) {
        return false
      }
      for (const key of a.keys()) {
        if (!b.has(key) || !equalityDeep(a.get(key), b.get(key))) {
          return false
        }
      }
      break
    }
    case undefined:
    case Object:
      if (object.size(a) !== object.size(b)) {
        return false
      }
      for (const key in a) {
        if (!object.hasProperty(a, key) || !equalityDeep(a[key], b[key])) {
          return false
        }
      }
      break
    case Array:
      if (a.length !== b.length) {
        return false
      }
      for (let i = 0; i < a.length; i++) {
        if (!equalityDeep(a[i], b[i])) {
          return false
        }
      }
      break
    default:
      return false
  }
  return true
};

/**
 * @template V
 * @template {V} OPTS
 *
 * @param {V} value
 * @param {Array<OPTS>} options
 */
// @ts-ignore
const isOneOf = (value, options) => options.includes(value);

exports.callAll = callAll;
exports.equalityDeep = equalityDeep;
exports.id = id;
exports.isOneOf = isOneOf;
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