'use strict';

var util = require('util');

var assert = require('assert');

var Sqlite = function() {

this.output = [];

this.params = [];

this._hasAddedAColumn = false;

};

var Postgres = require(__dirname + '/postgres');

util.inherits(Sqlite, Postgres);

Sqlite.prototype._myClass = Sqlite;

Sqlite.prototype._arrayAggFunctionName = 'GROUP_CONCAT';

Sqlite.prototype._getParameterValue = function(value) {

if (Buffer.isBuffer(value)) {

value = 'x' + this._getParameterValue(value.toString('hex'));

} else {

value = Postgres.prototype._getParameterValue.call(this, value);

}

return value;

};

Sqlite.prototype.visitDefault = function() {

throw new Error('SQLite requires that all rows of a multi-row insert are for the same columns.');

};

Sqlite.prototype.visitDropColumn = function() {

throw new Error('SQLite does not allow dropping columns.');

};

Sqlite.prototype.visitRenameColumn = function() {

throw new Error('SQLite does not allow renaming columns.');

};

Sqlite.prototype.visitReturning = function() {

throw new Error('SQLite does not allow returning clause.');

};

Sqlite.prototype.visitForUpdate = function() {

throw new Error('SQLite does not allow FOR UPDATE clause.');

};

Sqlite.prototype.visitForShare = function() {

throw new Error('SQLite does not allow FOR SHARE clause.');

};

Sqlite.prototype.visitAddColumn = function(addColumn) {

assert(!this._hasAddedAColumn, 'SQLite can not add more that one column at a time');

var result = Postgres.prototype.visitAddColumn.call(this, addColumn);

this._hasAddedAColumn = true;

return result;

};

Sqlite.prototype.visitIndexes = function(node) {

var tableName = this.visit(this._queryNode.table.toNode())[0];

return "PRAGMA INDEX_LIST(" + tableName + ")";

};

Sqlite.prototype.visitCascade = function() {

throw new Error('Sqlite do not support CASCADE in DROP TABLE');

};

Sqlite.prototype.visitRestrict = function() {

throw new Error('Sqlite do not support RESTRICT in DROP TABLE');

};

module.exports = Sqlite;