codemeasandwich/graphql-query-builder

"use strict";

//=====================================================
//============================ parce properties to find
//=====================================================

function parceFind(_levelA) {
    
//+++++++++++++++++++++++++++++++++++ work over Array
//++++++++++++++++++++++++++++++++++++++++++++++++++++
     
    let propsA = _levelA.map(function(currentValue, index) {
        
        let itemX = _levelA[index];
        
        if( itemX instanceof Query){
            return itemX.toString();
        } else if ( ! Array.isArray(itemX) && "object" === typeof itemX ) {
            let propsA = Object.keys(itemX);
            if ( 1 !== propsA.length) {
                throw new RangeError("Alias objects should only have one value. was passed: "+JSON.stringify(itemX));
            }
            let propS = propsA[0];
            let item = itemX[propS];
            // contributor: https://github.com/charlierudolph/graphql-query-builder/commit/878328e857e92d140f5ba6f7cfe07837620ec490
            if (Array.isArray(item)) {
              return new Query(propS).find(item)
            }
            return `${propS} : ${item} `;
        } else if ( "string" === typeof itemX ) {
            return itemX;
        } else {
            throw new RangeError("cannot handle Find value of "+itemX);
        }
    });
    
    return propsA.join(",");
}

//=====================================================
//=================================== get GraphQL Value
//=====================================================

function getGraphQLValue(value) {
      if ("string" === typeof value) {
        value = JSON.stringify(value);
      } else if (Array.isArray(value)) {
        value = value.map(item => {
            return getGraphQLValue(item);
            }).join();
        value = `[${value}]`;
      } else if ("object" === typeof value) {
      /*if (value.toSource)
            value = value.toSource().slice(2,-2);
        else*/
            value = objectToString(value);
            //console.error("No toSource!!",value);
      }
      return value;
}

function objectToString(obj) {
    
  let sourceA = [];
  
  for(let prop in obj){
    if ("function" === typeof obj[prop]) {
      continue;
    }
   // if ("object" === typeof obj[prop]) {
        sourceA.push(`${prop}:${getGraphQLValue(obj[prop])}`);
   // } else {
   //      sourceA.push(`${prop}:${obj[prop]}`);
   // }
  }
  return `{${sourceA.join()}}`;
}




//=====================================================
//========================================= Query Class
//=====================================================

function Query(_fnNameS, _aliasS_OR_Filter){
    
    this.fnNameS = _fnNameS;
    this.headA = [];
    
    this.filter = (filtersO) => {
 
        for(let propS in filtersO){
            if ("function" === typeof filtersO[propS]) {
              continue;
            }
            let val = getGraphQLValue(filtersO[propS]);
            if ("{}" === val) {
              continue;
            }
            this.headA.push( `${propS}:${val}` );
         } 
        return this;
    };
    
    if ("string" === typeof _aliasS_OR_Filter) {
      this.aliasS = _aliasS_OR_Filter;
    } else if ("object" === typeof _aliasS_OR_Filter) {
        this.filter(_aliasS_OR_Filter);
    } else if (undefined === _aliasS_OR_Filter && 2 === arguments.length){
        throw new TypeError("You have passed undefined as Second argument to 'Query'");
    } else if (undefined !== _aliasS_OR_Filter){
        throw new TypeError("Second argument to 'Query' should be an alias name(String) or filter arguments(Object). was passed "+_aliasS_OR_Filter);
    }

    this.setAlias = (_aliasS) =>{
       this.aliasS = _aliasS;
        return this;
    };
    
    this.find = function(findA) { // THIS NEED TO BE A "FUNCTION" to scope 'arguments'
        if( ! findA){
            throw new TypeError("find value can not be >>falsy<<");
        }
        // if its a string.. it may have other values
        // else it sould be an Object or Array of maped values
        this.bodyS = parceFind((Array.isArray(findA)) ? findA : Array.from(arguments));
        return this;
    };
}

//=====================================================
//===================================== Query prototype
//=====================================================

Query.prototype = {
    
    toString : function(){
        if (undefined === this.bodyS) {
            throw new ReferenceError("return properties are not defined. use the 'find' function to defined them");
        }
        
        return `${ (this.aliasS) ? (this.aliasS + ":") : "" } ${this.fnNameS } ${ (0 < this.headA.length)?"("+this.headA.join(",")+")":"" }  { ${ this.bodyS } }`;
    }
};

module.exports = Query;