'use strict';

var DefaultNode = require('./default');

var Node = require('./');

var ParameterNode = require('./parameter');

var Insert = Node.define({

type: 'INSERT',

constructor: function () {

Node.call(this);

this.names = [];

this.columns = [];

this.valueSets = [];

}

});

module.exports = Insert;

Insert.prototype.add = function (nodes) {

var hasColumns = false;

var hasValues = false;

var self = this;

var values = {};

nodes.forEach(function (node) {

var column = node.toNode();

var name = column.name;

var idx = self.names.indexOf(name);

if (idx < 0) {

self.names.push(name);

self.columns.push(column);

}

hasColumns = true;

hasValues = hasValues || column.value !== undefined;

values[name] = column;

});

// When none of the columns have a value, it's ambiguous whether the user

// intends to insert a row of default values or append a SELECT statement

// later. Resolve the ambiguity by assuming that if no columns are specified

// it is a row of default values, otherwise a SELECT will be added.

if (hasValues || !hasColumns) {

this.valueSets.push(values);

}

return self;

};

/*

* Get parameters for all values to be inserted. This function

* handles handles bulk inserts, where keys may be present

* in some objects and not others. When keys are not present,

* the insert should refer to the column value as DEFAULT.

*/

Insert.prototype.getParameters = function () {

var self = this;

return this.valueSets

.map(function (nodeDict) {

var set = [];

self.names.forEach(function (name) {

var node = nodeDict[name];

if (node) {

set.push(ParameterNode.getNodeOrParameterNode(node.value));

}

else {

set.push(new DefaultNode());

}

});

return set;

});

};