'use strict';

var OrderByValueNode = require('./orderByValue');

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

var TextNode = require('./text');

// Process values, wrapping them in ParameterNode if necessary.

var processParams = function(val) {

return Array.isArray(val) ? val.map(ParameterNode.getNodeOrParameterNode) : ParameterNode.getNodeOrParameterNode(val);

};

// Value expressions can be composed to form new value expressions.

// ValueExpressionMixin is evaluated at runtime, hence the

// "thunk" around it.

var ValueExpressionMixin = function() {

var BinaryNode = require('./binary');

var CastNode = require('./cast');

var PostfixUnaryNode = require('./postfixUnary');

var TernaryNode = require('./ternary');

var CaseNode = require('./case');

var AtNode = require('./at');

var SliceNode = require('./slice');

var postfixUnaryMethod = function(operator) {

/*jshint unused: false */

return function(val) {

return new PostfixUnaryNode({

left : this.toNode(),

operator : operator

});

};

};

var binaryMethod = function(operator) {

return function(val) {

return new BinaryNode({

left : this.toNode(),

operator : operator,

right : processParams(val)

});

};

};

var ternaryMethod = function(operator, separator) {

return function(middle, right) {

return new TernaryNode({

left : this.toNode(),

operator : operator,

middle : processParams(middle),

separator : separator,

right : processParams(right)

});

};

};

var atMethod = function(index) {

return new AtNode(this.toNode(), processParams(index));

};

var sliceMethod = function(start, end) {

return new SliceNode(this.toNode(), processParams(start), processParams(end));

};

var castMethod = function(dataType) {

return new CastNode(this.toNode(), dataType);

};

var orderMethod = function(direction) {

return function() {

return new OrderByValueNode({

value : this.toNode(),

direction : direction ? new TextNode(direction) : undefined

});

};

};

var caseMethod = function(whenList, thenList, elseBranch) {

if (undefined != elseBranch) {

elseBranch = processParams(elseBranch);

}

return new CaseNode({

whenList : processParams(whenList),

thenList : processParams(thenList),

else : elseBranch

})

}

return {

isNull : postfixUnaryMethod('IS NULL'),

isNotNull : postfixUnaryMethod('IS NOT NULL'),

or : binaryMethod('OR'),

and : binaryMethod('AND'),

equals : binaryMethod('='),

equal : binaryMethod('='),

notEquals : binaryMethod('<>'),

notEqual : binaryMethod('<>'),

gt : binaryMethod('>'),

gte : binaryMethod('>='),

lt : binaryMethod('<'),

lte : binaryMethod('<='),

plus : binaryMethod('+'),

minus : binaryMethod('-'),

multiply : binaryMethod('*'),

divide : binaryMethod('/'),

modulo : binaryMethod('%'),

leftShift : binaryMethod('<<'),

rightShift : binaryMethod('>>'),

bitwiseAnd : binaryMethod('&'),

bitwiseNot : binaryMethod('~'),

bitwiseOr : binaryMethod('|'),

bitwiseXor : binaryMethod('#'),

concat : binaryMethod('||'),

key : binaryMethod('->'),

keyText : binaryMethod('->>'),

path : binaryMethod('#>'),

pathText : binaryMethod('#>>'),

like : binaryMethod('LIKE'),

notLike : binaryMethod('NOT LIKE'),

in : binaryMethod('IN'),

notIn : binaryMethod('NOT IN'),

between : ternaryMethod('BETWEEN', 'AND'),

at : atMethod,

slice : sliceMethod,

cast : castMethod,

descending : orderMethod('DESC'),

case : caseMethod

};

};

module.exports = ValueExpressionMixin;