data-types.js

'use strict';

const util = require('util');
const inherits = require('./utils/inherits');
const _ = require('lodash');
const wkx = require('wkx');
const sequelizeErrors = require('./errors');
const warnings = {};
const Validator = require('./utils/validator-extras').validator;
const momentTz = require('moment-timezone');
const moment = require('moment');
const logger = require('./utils/logger');

function ABSTRACT() {}

ABSTRACT.prototype.dialectTypes = '';

ABSTRACT.prototype.toString = function toString(options) {
  return this.toSql(options);
};
ABSTRACT.prototype.toSql = function toSql() {
  return this.key;
};
ABSTRACT.warn = function warn(link, text) {
  if (!warnings[text]) {
    warnings[text] = true;
    logger.warn(`${text}, '\n>> Check:', ${link}`);
  }
};
ABSTRACT.prototype.stringify = function stringify(value, options) {
  if (this._stringify) {
    return this._stringify(value, options);
  }
  return value;
};
ABSTRACT.prototype.bindParam = function bindParam(value, options) {
  if (this._bindParam) {
    return this._bindParam(value, options);
  }
  return options.bindParam(this.stringify(value, options));
};

/**
 * STRING A variable length string
 *
 * @param {number} [length=255] length of string
 * @param {boolean} [binary=false] Is this binary?
 *
 * @namespace DataTypes.STRING
 *
 */
function STRING(length, binary) {
  const options = typeof length === 'object' && length || {length, binary};

  if (!(this instanceof STRING)) return new STRING(options);

  this.options = options;
  this._binary = options.binary;
  this._length = options.length || 255;
}
inherits(STRING, ABSTRACT);

STRING.prototype.key = STRING.key = 'STRING';
STRING.prototype.toSql = function toSql() {
  return 'VARCHAR(' + this._length + ')' + (this._binary ? ' BINARY' : '');
};
STRING.prototype.validate = function validate(value) {
  if (Object.prototype.toString.call(value) !== '[object String]') {
    if (this.options.binary && Buffer.isBuffer(value) || _.isNumber(value)) {
      return true;
    }
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid string', value));
  }

  return true;
};
Object.defineProperty(STRING.prototype, 'BINARY', {
  get() {
    this._binary = true;
    this.options.binary = true;
    return this;
  }
});

/**
 * CHAR A fixed length string
 *
 * @param {number} [length=255] length of string
 * @param {boolean} [binary=false] Is this binary?
 *
 * @namespace DataTypes.CHAR
 */
function CHAR(length, binary) {
  const options = typeof length === 'object' && length || {length, binary};

  if (!(this instanceof CHAR)) return new CHAR(options);
  STRING.apply(this, arguments);
}
inherits(CHAR, STRING);

CHAR.prototype.key = CHAR.key = 'CHAR';
CHAR.prototype.toSql = function toSql() {
  return 'CHAR(' + this._length + ')' + (this._binary ? ' BINARY' : '');
};

/**
 * Unlimited length TEXT column
 *
 * @param {string} [length=''] could be tiny, medium, long.
 *
 * @namespace DataTypes.TEXT
 */
function TEXT(length) {
  const options = typeof length === 'object' && length || {length};
  if (!(this instanceof TEXT)) return new TEXT(options);
  this.options = options;
  this._length = options.length || '';
}
inherits(TEXT, ABSTRACT);

TEXT.prototype.key = TEXT.key = 'TEXT';
TEXT.prototype.toSql = function toSql() {
  switch (this._length.toLowerCase()) {
    case 'tiny':
      return 'TINYTEXT';
    case 'medium':
      return 'MEDIUMTEXT';
    case 'long':
      return 'LONGTEXT';
    default:
      return this.key;
  }
};
TEXT.prototype.validate = function validate(value) {
  if (!_.isString(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid string', value));
  }

  return true;
};

/**
 * Base number type which is used to build other types
 *
 * @param {Object} options type options
 * @param {string|number} [options.length] length of type, like `INT(4)`
 * @param {boolean} [options.zerofill] Is zero filled?
 * @param {boolean} [options.unsigned] Is unsigned?
 * @param {string|number} [options.decimals] number of decimal points, used with length `FLOAT(5, 4)`
 * @param {string|number} [options.precision] defines precision for decimal type
 * @param {string|number} [options.scale] defines scale for decimal type
 *
 * @namespace DataTypes.NUMBER
 */
function NUMBER(options) {
  this.options = options;
  this._length = options.length;
  this._zerofill = options.zerofill;
  this._decimals = options.decimals;
  this._precision = options.precision;
  this._scale = options.scale;
  this._unsigned = options.unsigned;
}
inherits(NUMBER, ABSTRACT);

NUMBER.prototype.key = NUMBER.key = 'NUMBER';
NUMBER.prototype.toSql = function toSql() {
  let result = this.key;
  if (this._length) {
    result += '(' + this._length;
    if (typeof this._decimals === 'number') {
      result += ',' + this._decimals;
    }
    result += ')';
  }
  if (this._unsigned) {
    result += ' UNSIGNED';
  }
  if (this._zerofill) {
    result += ' ZEROFILL';
  }
  return result;
};
NUMBER.prototype.validate = function(value) {
  if (!Validator.isFloat(String(value))) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid ' + _.toLower(this.key), value));
  }

  return true;
};
Object.defineProperty(NUMBER.prototype, 'UNSIGNED', {
  get() {
    this._unsigned = true;
    this.options.unsigned = true;
    return this;
  }
});
Object.defineProperty(NUMBER.prototype, 'ZEROFILL', {
  get() {
    this._zerofill = true;
    this.options.zerofill = true;
    return this;
  }
});

/**
 * A 32 bit integer
 *
 * @param {string|number} [length] Integer length, INT(12)
 *
 * @namespace DataTypes.INTEGER
 */
function INTEGER(length) {
  const options = typeof length === 'object' && length || {length};
  if (!(this instanceof INTEGER)) return new INTEGER(options);
  NUMBER.call(this, options);
}
inherits(INTEGER, NUMBER);

INTEGER.prototype.key = INTEGER.key = 'INTEGER';
INTEGER.prototype.validate = function validate(value) {
  if (!Validator.isInt(String(value))) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid ' + _.toLower(this.key), value));
  }

  return true;
};

/**
 * A 8 bit integer
 *
 * @param {string|number} [length] Integer length
 *
 * @namespace DataTypes.TINYINT
 */
function TINYINT(length) {
  const options = typeof length === 'object' && length || {length};
  if (!(this instanceof TINYINT)) return new TINYINT(options);
  NUMBER.call(this, options);
}
inherits(TINYINT, INTEGER);

TINYINT.prototype.key = TINYINT.key = 'TINYINT';

/**
 * A 16 bit integer
 *
 * @param {string|number} [length] Integer length
 *
 * @namespace DataTypes.SMALLINT
 */
function SMALLINT(length) {
  const options = typeof length === 'object' && length || {length};
  if (!(this instanceof SMALLINT)) return new SMALLINT(options);
  NUMBER.call(this, options);
}
inherits(SMALLINT, INTEGER);

SMALLINT.prototype.key = SMALLINT.key = 'SMALLINT';

/**
 * A 24 bit integer
 *
 * @param {string|number} [length] Integer length
 *
 * @namespace DataTypes.MEDIUMINT
 */
function MEDIUMINT(length) {
  const options = typeof length === 'object' && length || {length};
  if (!(this instanceof MEDIUMINT)) return new MEDIUMINT(options);
  NUMBER.call(this, options);
}
inherits(MEDIUMINT, INTEGER);

MEDIUMINT.prototype.key = MEDIUMINT.key = 'MEDIUMINT';

/**
 * A 64 bit integer
 *
 * @param {string|number} [length] Integer length
 *
 * @namespace DataTypes.BIGINT
 */
function BIGINT(length) {
  const options = typeof length === 'object' && length || {length};
  if (!(this instanceof BIGINT)) return new BIGINT(options);
  NUMBER.call(this, options);
}
inherits(BIGINT, INTEGER);

BIGINT.prototype.key = BIGINT.key = 'BIGINT';

/**
 * Floating point number (4-byte precision).
 *
 * @param {string|number} [length] length of type, like `FLOAT(4)`
 * @param {string|number} [decimals] number of decimal points, used with length `FLOAT(5, 4)`
 *
 * @namespace DataTypes.FLOAT
 */
function FLOAT(length, decimals) {
  const options = typeof length === 'object' && length || {length, decimals};
  if (!(this instanceof FLOAT)) return new FLOAT(options);
  NUMBER.call(this, options);
}
inherits(FLOAT, NUMBER);

FLOAT.prototype.key = FLOAT.key = 'FLOAT';
FLOAT.prototype.validate = function validate(value) {
  if (!Validator.isFloat(String(value))) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid float', value));
  }

  return true;
};

/**
 * Floating point number (4-byte precision).
 *
 * @param {string|number} [length] length of type, like `REAL(4)`
 * @param {string|number} [decimals] number of decimal points, used with length `REAL(5, 4)`
 *
 * @namespace DataTypes.REAL
 */
function REAL(length, decimals) {
  const options = typeof length === 'object' && length || {length, decimals};
  if (!(this instanceof REAL)) return new REAL(options);
  NUMBER.call(this, options);
}
inherits(REAL, NUMBER);

REAL.prototype.key = REAL.key = 'REAL';

/**
 * Floating point number (8-byte precision).
 *
 * @param {string|number} [length] length of type, like `DOUBLE PRECISION(25)`
 * @param {string|number} [decimals] number of decimal points, used with length `DOUBLE PRECISION(25, 10)`
 *
 * @namespace DataTypes.DOUBLE
 */
function DOUBLE(length, decimals) {
  const options = typeof length === 'object' && length || {length, decimals};
  if (!(this instanceof DOUBLE)) return new DOUBLE(options);
  NUMBER.call(this, options);
}
inherits(DOUBLE, NUMBER);

DOUBLE.prototype.key = DOUBLE.key = 'DOUBLE PRECISION';

/**
 * Decimal type, variable precision, take length as specified by user
 *
 * @param {string|number} [precision] defines precision
 * @param {string|number} [scale] defines scale
 *
 * @namespace DataTypes.DECIMAL
 */
function DECIMAL(precision, scale) {
  const options = typeof precision === 'object' && precision || {precision, scale};
  if (!(this instanceof DECIMAL)) return new DECIMAL(options);
  NUMBER.call(this, options);
}
inherits(DECIMAL, NUMBER);

DECIMAL.prototype.key = DECIMAL.key = 'DECIMAL';
DECIMAL.prototype.toSql = function toSql() {

  if (this._precision || this._scale) {
    return 'DECIMAL(' + [this._precision, this._scale].filter(_.identity).join(',') + ')';
  }

  return 'DECIMAL';
};
DECIMAL.prototype.validate = function validate(value) {
  if (!Validator.isDecimal(String(value))) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid decimal', value));
  }

  return true;
};

for (const floating of [FLOAT, DOUBLE, REAL]) {
  floating.prototype.escape = false;
  floating.prototype._value = function _value(value) {
    if (isNaN(value)) {
      return 'NaN';
    } else if (!isFinite(value)) {
      const sign = value < 0 ? '-' : '';
      return sign + 'Infinity';
    }

    return value;
  };
  floating.prototype._stringify = function _stringify(value) {
    return "'" + this._value(value) + "'";
  };
  floating.prototype._bindParam = function _bindParam(value, options) {
    return options.bindParam(this._value(value));
  };
}

/**
 * A boolean / tinyint column, depending on dialect
 *
 * @namespace DataTypes.BOOLEAN
 */
function BOOLEAN() {
  if (!(this instanceof BOOLEAN)) return new BOOLEAN();
}
inherits(BOOLEAN, ABSTRACT);

BOOLEAN.prototype.key = BOOLEAN.key = 'BOOLEAN';
BOOLEAN.prototype.toSql = function toSql() {
  return 'TINYINT(1)';
};
BOOLEAN.prototype.validate = function validate(value) {
  if (!Validator.isBoolean(String(value))) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid boolean', value));
  }

  return true;
};

BOOLEAN.prototype._sanitize = function _sanitize(value) {
  if (value !== null && value !== undefined) {
    if (Buffer.isBuffer(value) && value.length === 1) {
      // Bit fields are returned as buffers
      value = value[0];
    }

    if (_.isString(value)) {
      // Only take action on valid boolean strings.
      value = value === 'true' ? true : value === 'false' ? false : value;

    } else if (_.isNumber(value)) {
      // Only take action on valid boolean integers.
      value = value === 1 ? true : value === 0 ? false : value;
    }
  }

  return value;
};
BOOLEAN.parse = BOOLEAN.prototype._sanitize;

/**
 * A time column
 *
 * @namespace DataTypes.TIME
 */
function TIME() {
  if (!(this instanceof TIME)) return new TIME();
}
inherits(TIME, ABSTRACT);

TIME.prototype.key = TIME.key = 'TIME';
TIME.prototype.toSql = function toSql() {
  return 'TIME';
};

/**
 * Date column with timezone, default is UTC
 *
 * @param {string|number} [length] precision to allow storing milliseconds
 *
 * @namespace DataTypes.DATE
 */
function DATE(length) {
  const options = typeof length === 'object' && length || {length};

  if (!(this instanceof DATE)) return new DATE(options);

  this.options = options;
  this._length = options.length || '';
}
inherits(DATE, ABSTRACT);

DATE.prototype.key = DATE.key = 'DATE';
DATE.prototype.toSql = function toSql() {
  return 'DATETIME';
};
DATE.prototype.validate = function validate(value) {
  if (!Validator.isDate(String(value))) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid date', value));
  }

  return true;
};

DATE.prototype._sanitize = function _sanitize(value, options) {
  if ((!options || options && !options.raw) && !(value instanceof Date) && !!value) {
    return new Date(value);
  }

  return value;
};

DATE.prototype._isChanged = function _isChanged(value, originalValue) {
  if (
    originalValue && !!value &&
    (
      value === originalValue ||
      value instanceof Date && originalValue instanceof Date && value.getTime() === originalValue.getTime()
    )
  ) {
    return false;
  }

  // not changed when set to same empty value
  if (!originalValue && !value && originalValue === value) {
    return false;
  }

  return true;
};

DATE.prototype._applyTimezone = function _applyTimezone(date, options) {
  if (options.timezone) {
    if (momentTz.tz.zone(options.timezone)) {
      date = momentTz(date).tz(options.timezone);
    } else {
      date = moment(date).utcOffset(options.timezone);
    }
  } else {
    date = momentTz(date);
  }

  return date;
};

DATE.prototype._stringify = function _stringify(date, options) {
  date = this._applyTimezone(date, options);

  // Z here means current timezone, _not_ UTC
  return date.format('YYYY-MM-DD HH:mm:ss.SSS Z');
};

/**
 * A date only column (no timestamp)
 *
 * @namespace DataTypes.DATEONLY
 */
function DATEONLY() {
  if (!(this instanceof DATEONLY)) return new DATEONLY();
}
util.inherits(DATEONLY, ABSTRACT);

DATEONLY.prototype.key = DATEONLY.key = 'DATEONLY';
DATEONLY.prototype.toSql = function() {
  return 'DATE';
};

DATEONLY.prototype._stringify = function _stringify(date) {
  return moment(date).format('YYYY-MM-DD');
};

DATEONLY.prototype._sanitize = function _sanitize(value, options) {
  if ((!options || options && !options.raw) && !!value) {
    return moment(value).format('YYYY-MM-DD');
  }

  return value;
};

DATEONLY.prototype._isChanged = function _isChanged(value, originalValue) {
  if (originalValue && !!value && originalValue === value) {
    return false;
  }

  // not changed when set to same empty value
  if (!originalValue && !value && originalValue === value) {
    return false;
  }

  return true;
};

/**
 * A key / value store column. Only available in Postgres.
 *
 * @namespace DataTypes.HSTORE
 */
function HSTORE() {
  if (!(this instanceof HSTORE)) return new HSTORE();
}
inherits(HSTORE, ABSTRACT);

HSTORE.prototype.key = HSTORE.key = 'HSTORE';
HSTORE.prototype.validate = function validate(value) {
  if (!_.isPlainObject(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid hstore', value));
  }

  return true;
};

/**
 * A JSON string column. Available in MySQL, Postgres and SQLite
 *
 * @namespace DataTypes.JSON
 */
function JSONTYPE() {
  if (!(this instanceof JSONTYPE)) return new JSONTYPE();
}
inherits(JSONTYPE, ABSTRACT);

JSONTYPE.prototype.key = JSONTYPE.key = 'JSON';
JSONTYPE.prototype.validate = function validate() {
  return true;
};

JSONTYPE.prototype._stringify = function _stringify(value) {
  return JSON.stringify(value);
};

/**
 * A binary storage JSON column. Only available in Postgres.
 *
 * @namespace DataTypes.JSONB
 */
function JSONB() {
  if (!(this instanceof JSONB)) return new JSONB();
  JSONTYPE.call(this);
}
inherits(JSONB, JSONTYPE);

JSONB.prototype.key = JSONB.key = 'JSONB';

/**
 * A default value of the current timestamp
 *
 * @namespace DataTypes.NOW
 */
function NOW() {
  if (!(this instanceof NOW)) return new NOW();
}
inherits(NOW, ABSTRACT);

NOW.prototype.key = NOW.key = 'NOW';

/**
 * Binary storage
 *
 * @param {string} [length=''] could be tiny, medium, long.
 *
 * @namespace DataTypes.BLOB
 *
 */
function BLOB(length) {
  const options = typeof length === 'object' && length || {length};
  if (!(this instanceof BLOB)) return new BLOB(options);
  this.options = options;
  this._length = options.length || '';
}
inherits(BLOB, ABSTRACT);

BLOB.prototype.key = BLOB.key = 'BLOB';
BLOB.prototype.toSql = function toSql() {
  switch (this._length.toLowerCase()) {
    case 'tiny':
      return 'TINYBLOB';
    case 'medium':
      return 'MEDIUMBLOB';
    case 'long':
      return 'LONGBLOB';
    default:
      return this.key;
  }
};
BLOB.prototype.validate = function validate(value) {
  if (!_.isString(value) && !Buffer.isBuffer(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid blob', value));
  }

  return true;
};

BLOB.prototype.escape = false;
BLOB.prototype._stringify = function _stringify(value) {
  if (!Buffer.isBuffer(value)) {
    if (Array.isArray(value)) {
      value = Buffer.from(value);
    } else {
      value = Buffer.from(value.toString());
    }
  }
  const hex = value.toString('hex');

  return this._hexify(hex);
};

BLOB.prototype._hexify = function _hexify(hex) {
  return "X'" + hex + "'";
};

BLOB.prototype._bindParam = function _bindParam(value, options) {
  if (!Buffer.isBuffer(value)) {
    if (Array.isArray(value)) {
      value = Buffer.from(value);
    } else {
      value = Buffer.from(value.toString());
    }
  }
  return options.bindParam(value);
};

/**
 * Range types are data types representing a range of values of some element type (called the range's subtype).
 * Only available in Postgres. See [the Postgres documentation](http://www.postgresql.org/docs/9.4/static/rangetypes.html) for more details
 *
 * @param {<DataTypes>} subtype A subtype for range, like RANGE(DATE)
 *
 * @namespace DataTypes.RANGE
 */
function RANGE(subtype) {
  const options = _.isPlainObject(subtype) ? subtype : {subtype};

  if (!options.subtype) options.subtype = new INTEGER();

  if (_.isFunction(options.subtype)) {
    options.subtype = new options.subtype();
  }

  if (!(this instanceof RANGE)) return new RANGE(options);

  this._subtype = options.subtype.key;
  this.options = options;
}
inherits(RANGE, ABSTRACT);

const pgRangeSubtypes = {
  integer: 'int4range',
  bigint: 'int8range',
  decimal: 'numrange',
  dateonly: 'daterange',
  date: 'tstzrange',
  datenotz: 'tsrange'
};

const pgRangeCastTypes = {
  integer: 'integer',
  bigint: 'bigint',
  decimal: 'numeric',
  dateonly: 'date',
  date: 'timestamptz',
  datenotz: 'timestamp'
};

RANGE.prototype.key = RANGE.key = 'RANGE';
RANGE.prototype.toSql = function toSql() {
  return pgRangeSubtypes[this._subtype.toLowerCase()];
};
RANGE.prototype.toCastType = function toCastType() {
  return pgRangeCastTypes[this._subtype.toLowerCase()];
};
RANGE.prototype.validate = function validate(value) {
  if (!_.isArray(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid range', value));
  }

  if (value.length !== 2) {
    throw new sequelizeErrors.ValidationError('A range must be an array with two elements');
  }

  return true;
};

/**
 * A column storing a unique universal identifier.
 * Use with `UUIDV1` or `UUIDV4` for default values.
 *
 * @namespace DataTypes.UUID
 */
function UUID() {
  if (!(this instanceof UUID)) return new UUID();
}
inherits(UUID, ABSTRACT);

UUID.prototype.key = UUID.key = 'UUID';
UUID.prototype.validate = function validate(value, options) {
  if (!_.isString(value) || !Validator.isUUID(value) && (!options || !options.acceptStrings)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid uuid', value));
  }

  return true;
};

/**
 * A default unique universal identifier generated following the UUID v1 standard
 *
 * @namespace DataTypes.UUIDV1
 */
function UUIDV1() {
  if (!(this instanceof UUIDV1)) return new UUIDV1();
}
inherits(UUIDV1, ABSTRACT);

UUIDV1.prototype.key = UUIDV1.key = 'UUIDV1';
UUIDV1.prototype.validate = function validate(value, options) {
  if (!_.isString(value) || !Validator.isUUID(value) && (!options || !options.acceptStrings)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid uuid', value));
  }

  return true;
};

/**
 * A default unique universal identifier generated following the UUID v4 standard
 *
 * @namespace DataTypes.UUIDV4
 */
function UUIDV4() {
  if (!(this instanceof UUIDV4)) return new UUIDV4();
}
inherits(UUIDV4, ABSTRACT);

UUIDV4.prototype.key = UUIDV4.key = 'UUIDV4';
UUIDV4.prototype.validate = function validate(value, options) {
  if (!_.isString(value) || !Validator.isUUID(value, 4) && (!options || !options.acceptStrings)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid uuidv4', value));
  }

  return true;
};

/**
 * A virtual value that is not stored in the DB. This could for example be useful if you want to provide a default value in your model that is returned to the user but not stored in the DB.
 *
 * You could also use it to validate a value before permuting and storing it. VIRTUAL also takes a return type and dependency fields as arguments
 * If a virtual attribute is present in `attributes` it will automatically pull in the extra fields as well.
 * Return type is mostly useful for setups that rely on types like GraphQL.
 *
 * @example <caption>Checking password length before hashing it</caption>
 * sequelize.define('user', {
 *   password_hash: DataTypes.STRING,
 *   password: {
 *     type: DataTypes.VIRTUAL,
 *     set: function (val) {
 *        // Remember to set the data value, otherwise it won't be validated
 *        this.setDataValue('password', val);
 *        this.setDataValue('password_hash', this.salt + val);
 *      },
 *      validate: {
 *         isLongEnough: function (val) {
 *           if (val.length < 7) {
 *             throw new Error("Please choose a longer password")
 *          }
 *       }
 *     }
 *   }
 * })
 *
 * # In the above code the password is stored plainly in the password field so it can be validated, but is never stored in the DB.
 *
 * @example <caption>Virtual with dependency fields</caption>
 * {
 *   active: {
 *     type: new DataTypes.VIRTUAL(DataTypes.BOOLEAN, ['createdAt']),
 *     get: function() {
 *       return this.get('createdAt') > Date.now() - (7 * 24 * 60 * 60 * 1000)
 *     }
 *   }
 * }
 *
 * @param {<DataTypes>} [ReturnType] return type for virtual type
 * @param {Array} [fields] array of fields this virtual type is dependent on
 *
 * @namespace DataTypes.VIRTUAL
 *
 */
function VIRTUAL(ReturnType, fields) {
  if (!(this instanceof VIRTUAL)) return new VIRTUAL(ReturnType, fields);
  if (typeof ReturnType === 'function') ReturnType = new ReturnType();

  this.returnType = ReturnType;
  this.fields = fields;
}
inherits(VIRTUAL, ABSTRACT);

VIRTUAL.prototype.key = VIRTUAL.key = 'VIRTUAL';

/**
 * An enumeration, Postgres Only
 *
 * @example
 * DataTypes.ENUM('value', 'another value')
 * DataTypes.ENUM(['value', 'another value'])
 * DataTypes.ENUM({
 *   values: ['value', 'another value']
 * })
 *
 * @param {Array|Object} value either array of values or options object with values array. It also supports variadic values
 *
 * @namespace DataTypes.ENUM
 *
 */
function ENUM(value) {
  const options = typeof value === 'object' && !Array.isArray(value) && value || {
    values: Array.prototype.slice.call(arguments).reduce((result, element) => {
      return result.concat(Array.isArray(element) ? element : [element]);
    }, [])
  };
  if (!(this instanceof ENUM)) return new ENUM(options);
  this.values = options.values;
  this.options = options;
}
inherits(ENUM, ABSTRACT);

ENUM.prototype.key = ENUM.key = 'ENUM';
ENUM.prototype.validate = function validate(value) {
  if (!_.includes(this.values, value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid choice in %j', value, this.values));
  }

  return true;
};

/**
 * An array of `type`. Only available in Postgres.
 *
 * @example
 * DataTypes.ARRAY(DataTypes.DECIMAL)`.
 *
 * @param {<DataTypes>} type type of array values
 *
 * @namespace DataTypes.ARRAY
 */
function ARRAY(type) {
  const options = _.isPlainObject(type) ? type : {type};
  if (!(this instanceof ARRAY)) return new ARRAY(options);
  this.type = typeof options.type === 'function' ? new options.type() : options.type;
}
inherits(ARRAY, ABSTRACT);

ARRAY.prototype.key = ARRAY.key = 'ARRAY';
ARRAY.prototype.toSql = function toSql() {
  return this.type.toSql() + '[]';
};
ARRAY.prototype.validate = function validate(value) {
  if (!_.isArray(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid array', value));
  }

  return true;
};
ARRAY.is = function is(obj, type) {
  return obj instanceof ARRAY && obj.type instanceof type;
};

/**
 * A column storing Geometry information.
 * It is only available in PostgreSQL (with PostGIS) or MySQL.
 * In MySQL, allowable Geometry types are `POINT`, `LINESTRING`, `POLYGON`.
 *
 * GeoJSON is accepted as input and returned as output.
 *
 * In PostGIS, the GeoJSON is parsed using the PostGIS function `ST_GeomFromGeoJSON`.
 * In MySQL it is parsed using the function `GeomFromText`.
 *
 * Therefore, one can just follow the [GeoJSON spec](http://geojson.org/geojson-spec.html) for handling geometry objects.  See the following examples:
 *
 * @example <caption>Defining a Geometry type attribute</caption>
 * DataTypes.GEOMETRY
 * DataTypes.GEOMETRY('POINT')
 * DataTypes.GEOMETRY('POINT', 4326)
 *
 * @example <caption>Create a new point</caption>
 * const point = { type: 'Point', coordinates: [39.807222,-76.984722]};
 *
 * User.create({username: 'username', geometry: point });
 *
 * @example <caption>Create a new linestring</caption>
 * const line = { type: 'LineString', 'coordinates': [ [100.0, 0.0], [101.0, 1.0] ] };
 *
 * User.create({username: 'username', geometry: line });
 *
 * @example <caption>Create a new polygon</caption>
 * const polygon = { type: 'Polygon', coordinates: [
 *                 [ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0],
 *                   [100.0, 1.0], [100.0, 0.0] ]
 *                 ]};
 *
 * User.create({username: 'username', geometry: polygon });

 * @example <caption>Create a new point with a custom SRID</caption>
 * const point = {
 *   type: 'Point',
 *   coordinates: [39.807222,-76.984722],
 *   crs: { type: 'name', properties: { name: 'EPSG:4326'} }
 * };
 *
 * User.create({username: 'username', geometry: point })
 *
 * @param {string} [type] Type of geometry data
 * @param {string} [srid] SRID of type
 *
 * @see {@link DataTypes.GEOGRAPHY}
 * @namespace DataTypes.GEOMETRY
 */
function GEOMETRY(type, srid) {
  const options = _.isPlainObject(type) ? type : {type, srid};

  if (!(this instanceof GEOMETRY)) return new GEOMETRY(options);

  this.options = options;
  this.type = options.type;
  this.srid = options.srid;
}
inherits(GEOMETRY, ABSTRACT);

GEOMETRY.prototype.key = GEOMETRY.key = 'GEOMETRY';

GEOMETRY.prototype.escape = false;
GEOMETRY.prototype._stringify = function _stringify(value, options) {
  return 'GeomFromText(' + options.escape(wkx.Geometry.parseGeoJSON(value).toWkt()) + ')';
};
GEOMETRY.prototype._bindParam = function _bindParam(value, options) {
  return 'GeomFromText(' + options.bindParam(wkx.Geometry.parseGeoJSON(value).toWkt()) + ')';
};

/**
 * A geography datatype represents two dimensional spacial objects in an elliptic coord system.
 *
 * __The difference from geometry and geography type:__
 *
 * PostGIS 1.5 introduced a new spatial type called geography, which uses geodetic measurement instead of Cartesian measurement.
 * Coordinate points in the geography type are always represented in WGS 84 lon lat degrees (SRID 4326),
 * but measurement functions and relationships ST_Distance, ST_DWithin, ST_Length, and ST_Area always return answers in meters or assume inputs in meters.
 *
 * __What is best to use? It depends:__
 *
 * When choosing between the geometry and geography type for data storage, you should consider what you’ll be using it for.
 * If all you do are simple measurements and relationship checks on your data, and your data covers a fairly large area, then most likely you’ll be better off storing your data using the new geography type.
 * Although the new geography data type can cover the globe, the geometry type is far from obsolete.
 * The geometry type has a much richer set of functions than geography, relationship checks are generally faster, and it has wider support currently across desktop and web-mapping tools
 *
 * @example <caption>Defining a Geography type attribute</caption>
 * DataTypes.GEOGRAPHY
 * DataTypes.GEOGRAPHY('POINT')
 * DataTypes.GEOGRAPHY('POINT', 4326)
 *
 * @param {string} [type] Type of geography data
 * @param {string} [srid] SRID of type
 *
 * @namespace DataTypes.GEOGRAPHY
 */
function GEOGRAPHY(type, srid) {
  const options = _.isPlainObject(type) ? type : {type, srid};

  if (!(this instanceof GEOGRAPHY)) return new GEOGRAPHY(options);

  this.options = options;
  this.type = options.type;
  this.srid = options.srid;
}
inherits(GEOGRAPHY, ABSTRACT);

GEOGRAPHY.prototype.key = GEOGRAPHY.key = 'GEOGRAPHY';

GEOGRAPHY.prototype.escape = false;
GEOGRAPHY.prototype._stringify = function _stringify(value, options) {
  return 'GeomFromText(' + options.escape(wkx.Geometry.parseGeoJSON(value).toWkt()) + ')';
};
GEOGRAPHY.prototype._bindParam = function _bindParam(value, options) {
  return 'GeomFromText(' + options.bindParam(wkx.Geometry.parseGeoJSON(value).toWkt()) + ')';
};

/**
 * The cidr type holds an IPv4 or IPv6 network specification. Takes 7 or 19 bytes.
 *
 * Only available for Postgres
 *
 * @namespace DataTypes.CIDR
 */
function CIDR() {
  if (!(this instanceof CIDR)) return new CIDR();
}
inherits(CIDR, ABSTRACT);

CIDR.prototype.key = CIDR.key = 'CIDR';

CIDR.prototype.validate = function validate(value) {
  if (!_.isString(value) || !Validator.isIPRange(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid CIDR', value));
  }

  return true;
};

/**
 * The INET type holds an IPv4 or IPv6 host address, and optionally its subnet. Takes 7 or 19 bytes
 *
 * Only available for Postgres
 *
 * @namespace DataTypes.INET
 */
function INET() {
  if (!(this instanceof INET)) return new INET();
}
inherits(INET, ABSTRACT);

INET.prototype.key = INET.key = 'INET';

INET.prototype.validate = function validate(value) {
  if (!_.isString(value) || !Validator.isIP(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid INET', value));
  }

  return true;
};

/**
 * The MACADDR type stores MAC addresses. Takes 6 bytes
 *
 * Only available for Postgres
 *
 * @namespace DataTypes.MACADDR
 */
function MACADDR() {
  if (!(this instanceof MACADDR)) return new MACADDR();
}
inherits(MACADDR, ABSTRACT);

MACADDR.prototype.key = MACADDR.key = 'MACADDR';

MACADDR.prototype.validate = function validate(value) {
  if (!_.isString(value) || !Validator.isMACAddress(value)) {
    throw new sequelizeErrors.ValidationError(util.format('%j is not a valid MACADDR', value));
  }

  return true;
};

const helpers = {
  BINARY: [STRING, CHAR],
  UNSIGNED: [NUMBER, TINYINT, SMALLINT, MEDIUMINT, INTEGER, BIGINT, FLOAT, DOUBLE, REAL, DECIMAL],
  ZEROFILL: [NUMBER, TINYINT, SMALLINT, MEDIUMINT, INTEGER, BIGINT, FLOAT, DOUBLE, REAL, DECIMAL],
  PRECISION: [DECIMAL],
  SCALE: [DECIMAL]
};

for (const helper of Object.keys(helpers)) {
  for (const DataType of helpers[helper]) {
    if (!DataType[helper]) {
      Object.defineProperty(DataType, helper, {
        get() {
          const dataType = new DataType();
          if (typeof dataType[helper] === 'object') {
            return dataType;
          }
          return dataType[helper].apply(dataType, arguments);
        }
      });
    }
  }
}

/**
 * A convenience class holding commonly used data types. The data types are used when defining a new model using `Sequelize.define`, like this:
 * ```js
 * sequelize.define('model', {
 *   column: DataTypes.INTEGER
 * })
 * ```
 * When defining a model you can just as easily pass a string as type, but often using the types defined here is beneficial. For example, using `DataTypes.BLOB`, mean
 * that that column will be returned as an instance of `Buffer` when being fetched by sequelize.
 *
 * To provide a length for the data type, you can invoke it like a function: `INTEGER(2)`
 *
 * Some data types have special properties that can be accessed in order to change the data type.
 * For example, to get an unsigned integer with zerofill you can do `DataTypes.INTEGER.UNSIGNED.ZEROFILL`.
 * The order you access the properties in do not matter, so `DataTypes.INTEGER.ZEROFILL.UNSIGNED` is fine as well.
 *
 * * All number types (`INTEGER`, `BIGINT`, `FLOAT`, `DOUBLE`, `REAL`, `DECIMAL`) expose the properties `UNSIGNED` and `ZEROFILL`
 * * The `CHAR` and `STRING` types expose the `BINARY` property
 *
 * Three of the values provided here (`NOW`, `UUIDV1` and `UUIDV4`) are special default values, that should not be used to define types. Instead they are used as shorthands for
 * defining default values. For example, to get a uuid field with a default value generated following v1 of the UUID standard:
 * ```js`
 * sequelize.define('model',` {
 *   uuid: {
 *     type: DataTypes.UUID,
 *     defaultValue: DataTypes.UUIDV1,
 *     primaryKey: true
 *   }
 * })
 * ```
 * There may be times when you want to generate your own UUID conforming to some other algorithm. This is accomplished
 * using the defaultValue property as well, but instead of specifying one of the supplied UUID types, you return a value
 * from a function.
 * ```js
 * sequelize.define('model', {
 *   uuid: {
 *     type: DataTypes.UUID,
 *     defaultValue: function() {
 *       return generateMyId()
 *     },
 *     primaryKey: true
 *   }
 * })
 * ```
 *
 * @namespace DataTypes
 */
const DataTypes = module.exports = {
  ABSTRACT,
  STRING,
  CHAR,
  TEXT,
  NUMBER,
  TINYINT,
  SMALLINT,
  MEDIUMINT,
  INTEGER,
  BIGINT,
  FLOAT,
  TIME,
  DATE,
  DATEONLY,
  BOOLEAN,
  NOW,
  BLOB,
  DECIMAL,
  NUMERIC: DECIMAL,
  UUID,
  UUIDV1,
  UUIDV4,
  HSTORE,
  JSON: JSONTYPE,
  JSONB,
  VIRTUAL,
  ARRAY,
  ENUM,
  RANGE,
  REAL,
  DOUBLE,
  'DOUBLE PRECISION': DOUBLE,
  GEOMETRY,
  GEOGRAPHY,
  CIDR,
  INET,
  MACADDR
};

_.each(DataTypes, dataType => {
  dataType.types = {};
});

DataTypes.postgres = require('./dialects/postgres/data-types')(DataTypes);
DataTypes.mysql = require('./dialects/mysql/data-types')(DataTypes);
DataTypes.sqlite = require('./dialects/sqlite/data-types')(DataTypes);
DataTypes.mssql = require('./dialects/mssql/data-types')(DataTypes);

module.exports = DataTypes;