'use strict';
/**
 * @module Suite
 */

/**
 * Module dependencies.
 */
var EventEmitter = require('events').EventEmitter;
var Hook = require('./hook');
var utils = require('./utils');
var inherits = utils.inherits;
var debug = require('debug')('mocha:suite');
var milliseconds = require('./ms');

/**
 * Expose `Suite`.
 */

exports = module.exports = Suite;

/**
 * Create a new `Suite` with the given `title` and parent `Suite`. When a suite
 * with the same title is already present, that suite is returned to provide
 * nicer reporter and more flexible meta-testing.
 *
 * @memberof Mocha
 * @public
 * @api public
 * @param {Suite} parent
 * @param {string} title
 * @return {Suite}
 */
exports.create = function (parent, title) {
  var suite = new Suite(title, parent.ctx);
  suite.parent = parent;
  title = suite.fullTitle();
  parent.addSuite(suite);
  return suite;
};

/**
 * Initialize a new `Suite` with the given `title` and `ctx`. Derived from [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)
 *
 * @memberof Mocha
 * @public
 * @class
 * @param {string} title
 * @param {Context} parentContext
 */
function Suite (title, parentContext) {
  if (!utils.isString(title)) {
    throw new Error('Suite `title` should be a "string" but "' + typeof title + '" was given instead.');
  }
  this.title = title;
  function Context () {}
  Context.prototype = parentContext;
  this.ctx = new Context();
  this.suites = [];
  this.tests = [];
  this.pending = false;
  this._beforeEach = [];
  this._beforeAll = [];
  this._afterEach = [];
  this._afterAll = [];
  this.root = !title;
  this._timeout = 2000;
  this._enableTimeouts = true;
  this._slow = 75;
  this._bail = false;
  this._retries = -1;
  this._onlyTests = [];
  this._onlySuites = [];
  this.delayed = false;
}

/**
 * Inherit from `EventEmitter.prototype`.
 */
inherits(Suite, EventEmitter);

/**
 * Return a clone of this `Suite`.
 *
 * @api private
 * @return {Suite}
 */
Suite.prototype.clone = function () {
  var suite = new Suite(this.title);
  debug('clone');
  suite.ctx = this.ctx;
  suite.timeout(this.timeout());
  suite.retries(this.retries());
  suite.enableTimeouts(this.enableTimeouts());
  suite.slow(this.slow());
  suite.bail(this.bail());
  return suite;
};

/**
 * Set or get timeout `ms` or short-hand such as "2s".
 *
 * @api private
 * @param {number|string} ms
 * @return {Suite|number} for chaining
 */
Suite.prototype.timeout = function (ms) {
  if (!arguments.length) {
    return this._timeout;
  }
  if (ms.toString() === '0') {
    this._enableTimeouts = false;
  }
  if (typeof ms === 'string') {
    ms = milliseconds(ms);
  }
  debug('timeout %d', ms);
  this._timeout = parseInt(ms, 10);
  return this;
};

/**
 * Set or get number of times to retry a failed test.
 *
 * @api private
 * @param {number|string} n
 * @return {Suite|number} for chaining
 */
Suite.prototype.retries = function (n) {
  if (!arguments.length) {
    return this._retries;
  }
  debug('retries %d', n);
  this._retries = parseInt(n, 10) || 0;
  return this;
};

/**
  * Set or get timeout to `enabled`.
  *
  * @api private
  * @param {boolean} enabled
  * @return {Suite|boolean} self or enabled
  */
Suite.prototype.enableTimeouts = function (enabled) {
  if (!arguments.length) {
    return this._enableTimeouts;
  }
  debug('enableTimeouts %s', enabled);
  this._enableTimeouts = enabled;
  return this;
};

/**
 * Set or get slow `ms` or short-hand such as "2s".
 *
 * @api private
 * @param {number|string} ms
 * @return {Suite|number} for chaining
 */
Suite.prototype.slow = function (ms) {
  if (!arguments.length) {
    return this._slow;
  }
  if (typeof ms === 'string') {
    ms = milliseconds(ms);
  }
  debug('slow %d', ms);
  this._slow = ms;
  return this;
};

/**
 * Set or get whether to bail after first error.
 *
 * @api private
 * @param {boolean} bail
 * @return {Suite|number} for chaining
 */
Suite.prototype.bail = function (bail) {
  if (!arguments.length) {
    return this._bail;
  }
  debug('bail %s', bail);
  this._bail = bail;
  return this;
};

/**
 * Check if this suite or its parent suite is marked as pending.
 *
 * @api private
 */
Suite.prototype.isPending = function () {
  return this.pending || (this.parent && this.parent.isPending());
};

/**
 * Generic hook-creator.
 * @private
 * @param {string} title - Title of hook
 * @param {Function} fn - Hook callback
 * @returns {Hook} A new hook
 */
Suite.prototype._createHook = function (title, fn) {
  var hook = new Hook(title, fn);
  hook.parent = this;
  hook.timeout(this.timeout());
  hook.retries(this.retries());
  hook.enableTimeouts(this.enableTimeouts());
  hook.slow(this.slow());
  hook.ctx = this.ctx;
  hook.file = this.file;
  return hook;
};

/**
 * Run `fn(test[, done])` before running tests.
 *
 * @api private
 * @param {string} title
 * @param {Function} fn
 * @return {Suite} for chaining
 */
Suite.prototype.beforeAll = function (title, fn) {
  if (this.isPending()) {
    return this;
  }
  if (typeof title === 'function') {
    fn = title;
    title = fn.name;
  }
  title = '"before all" hook' + (title ? ': ' + title : '');

  var hook = this._createHook(title, fn);
  this._beforeAll.push(hook);
  this.emit('beforeAll', hook);
  return this;
};

/**
 * Run `fn(test[, done])` after running tests.
 *
 * @api private
 * @param {string} title
 * @param {Function} fn
 * @return {Suite} for chaining
 */
Suite.prototype.afterAll = function (title, fn) {
  if (this.isPending()) {
    return this;
  }
  if (typeof title === 'function') {
    fn = title;
    title = fn.name;
  }
  title = '"after all" hook' + (title ? ': ' + title : '');

  var hook = this._createHook(title, fn);
  this._afterAll.push(hook);
  this.emit('afterAll', hook);
  return this;
};

/**
 * Run `fn(test[, done])` before each test case.
 *
 * @api private
 * @param {string} title
 * @param {Function} fn
 * @return {Suite} for chaining
 */
Suite.prototype.beforeEach = function (title, fn) {
  if (this.isPending()) {
    return this;
  }
  if (typeof title === 'function') {
    fn = title;
    title = fn.name;
  }
  title = '"before each" hook' + (title ? ': ' + title : '');

  var hook = this._createHook(title, fn);
  this._beforeEach.push(hook);
  this.emit('beforeEach', hook);
  return this;
};

/**
 * Run `fn(test[, done])` after each test case.
 *
 * @api private
 * @param {string} title
 * @param {Function} fn
 * @return {Suite} for chaining
 */
Suite.prototype.afterEach = function (title, fn) {
  if (this.isPending()) {
    return this;
  }
  if (typeof title === 'function') {
    fn = title;
    title = fn.name;
  }
  title = '"after each" hook' + (title ? ': ' + title : '');

  var hook = this._createHook(title, fn);
  this._afterEach.push(hook);
  this.emit('afterEach', hook);
  return this;
};

/**
 * Add a test `suite`.
 *
 * @api private
 * @param {Suite} suite
 * @return {Suite} for chaining
 */
Suite.prototype.addSuite = function (suite) {
  suite.parent = this;
  suite.timeout(this.timeout());
  suite.retries(this.retries());
  suite.enableTimeouts(this.enableTimeouts());
  suite.slow(this.slow());
  suite.bail(this.bail());
  this.suites.push(suite);
  this.emit('suite', suite);
  return this;
};

/**
 * Add a `test` to this suite.
 *
 * @api private
 * @param {Test} test
 * @return {Suite} for chaining
 */
Suite.prototype.addTest = function (test) {
  test.parent = this;
  test.timeout(this.timeout());
  test.retries(this.retries());
  test.enableTimeouts(this.enableTimeouts());
  test.slow(this.slow());
  test.ctx = this.ctx;
  this.tests.push(test);
  this.emit('test', test);
  return this;
};

/**
 * Return the full title generated by recursively concatenating the parent's
 * full title.
 *
 * @memberof Mocha.Suite
 * @public
 * @api public
 * @return {string}
 */
Suite.prototype.fullTitle = function () {
  return this.titlePath().join(' ');
};

/**
 * Return the title path generated by recursively concatenating the parent's
 * title path.
 *
 * @memberof Mocha.Suite
 * @public
 * @api public
 * @return {string}
 */
Suite.prototype.titlePath = function () {
  var result = [];
  if (this.parent) {
    result = result.concat(this.parent.titlePath());
  }
  if (!this.root) {
    result.push(this.title);
  }
  return result;
};

/**
 * Return the total number of tests.
 *
 * @memberof Mocha.Suite
 * @public
 * @api public
 * @return {number}
 */
Suite.prototype.total = function () {
  return this.suites.reduce(function (sum, suite) {
    return sum + suite.total();
  }, 0) + this.tests.length;
};

/**
 * Iterates through each suite recursively to find all tests. Applies a
 * function in the format `fn(test)`.
 *
 * @api private
 * @param {Function} fn
 * @return {Suite}
 */
Suite.prototype.eachTest = function (fn) {
  this.tests.forEach(fn);
  this.suites.forEach(function (suite) {
    suite.eachTest(fn);
  });
  return this;
};

/**
 * This will run the root suite if we happen to be running in delayed mode.
 */
Suite.prototype.run = function run () {
  if (this.root) {
    this.emit('run');
  }
};