package com.example

import spray.json._

case class Color( name: String, red: Double, green: Int, blue: Int )
case class Colors( colors: List[Color] )
case class Paint( name: String, colors: Colors )

object MyJsonProtocol extends DefaultJsonProtocol {
    implicit val colorFormat = jsonFormat4( Color
 
 ) //4個屬性
    implicit val colorsFormat = jsonFormat1( Colors ) //1個屬性
    implicit val paintFormat = jsonFormat2( Paint ) //2個屬性
}

/**
 * Author: zhouhh
 * Date: 2017.7.15
 *  抽象語法樹結構(Abstract Syntax Tree (AST)), 是Json物件樹, 區別於json字串和模型物件
 *  該程式碼演示三者之間互轉. 但引入複雜物件,浮點和集合
 *
 */
object TestSprayJsonConvert {
    import
 
 MyJsonProtocol._

    def main( args: Array[String] ): Unit = {
        //object  to jsonAst, 軍校藍, 此處故意調整值為浮點
        val json = Color( "CadetBlue", 95.2, 158, 160 ).toJson
        println( json ) //{"name":"CadetBlue","red":95,"green":158,"blue":160}
        //jsonAst to object
        val color = json.convertTo
 
[Color]
        println( "name:" + color.name + ",red:" + color.red + ",green:" + color.green + ",blue:" + color.blue ) //name:CadetBlue,red:95,green:158,blue:160

        val jsonsListStr = "[{\"name\":\"CadetBlue\",\"red\":95.3,\"green\":158,\"blue\":160},{\"name\":\"CadetRed\",\"red\":160.5,\"green\":158,\"blue\":95}]"
        //另一種更直觀的表示
        val jsons = """{"colors":[{"name":"CadetBlue","red":95.3,"green":158,"blue":160},{"name":"CadetRed","red":160.5,"green":158,"blue":95}]}"""
        //string -> jsonAst(JsValue) -> object
        val colorsObj: Colors = jsons.parseJson.convertTo[Colors]
        print( colorsObj )
        val colorsList: List[Color] = jsonsListStr.parseJson.convertTo( DefaultJsonProtocol.listFormat[Color] )
        //此處故意將colorsObj命名有區別,否則出現兩個colors, 後者是前者的成員.
        colorsObj.colors.foreach { color =>
            println( "name:" + color.name + ",red:" + color.red + ",green:" + color.green + ",blue:" + color.blue )

        }
        //do the same thing but directly var List
        colorsList.foreach { color =>
            println( "name:" + color.name + ",red:" + color.red + ",green:" + color.green + ",blue:" + color.blue )

        }

        //object -> json
        // val listjson = colors.colors.toArray.toJson
        val listjson: JsValue = colorsObj.toJson
        println( listjson )

        //複雜結構, json字串,物件互轉.
        val paintJsonStr = """ {"name":"mypaint","colors":{"colors":[{"name":"CadetBlue","red":95.3,"green":158,"blue":160},{"name":"CadetRed","red":160.5,"green":158,"blue":95}]}}"""

        val paintAST = paintJsonStr.parseJson
        val paint: Paint = paintAST.convertTo[Paint]
        val paintJsonStrTo = paint.toJson
        println( paintAST )
        println( paint )
        println( paintJsonStrTo )

    }

}