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import javafx.data.pull.PullParser;
import javafx.data.xml.QName;
import javafx.io.http.HttpRequest;
import javafx.scene.Cursor;
import javafx.scene.CustomNode;
import javafx.scene.Group;
import javafx.scene.text.Text;

/**
 * @author Sergey A. Malenkov
 */

public class Weather extends CustomNode {
    public var celsius = true;
    public var code:String;
    public var location:String;
    public var forecast:Forecast[];
    var index = 0;
    var newForecast = bind forecast[ index ] on replace oldForecast {
        oldForecast.visible = false;
        newForecast.visible = true;
    }
    var url = bind if (celsius)
        then "http://weather.yahooapis.com/forecastrss?p={code}&u=c"
        else "http://weather.yahooapis.com/forecastrss?p={code}&u=f" on replace {
            if (url.length() == 55) {
                location = "Loading...";
                delete forecast;
                index = 0;
                HttpRequest {
                location: url
                onDone:function() {
                    if (forecast.isEmpty())
                        location = "Loading error"
                }
                onInput:function(input) {
                    try {
                        PullParser {
                            var wind:Wind;
                            var temp:String;
                            var speed:String;
                            input: input
                            onEvent:function(event) {
                                if ((event.type == PullParser.START_ELEMENT) and (event.qname.prefix == "yweather")) {
                                    if (event.qname.name == "location") {
                                        location = event.getAttributeValue(QName{name: "city"});
                                        def region = event.getAttributeValue(QName{name: "region"});
                                        if (0 < region.length()) {
                                        location = "{ location }, { region }"
                                        }
                                    }
                                    else if (event.qname.name == "units") {
                                        temp  = event.getAttributeValue(QName{name: "temperature"});
                                        speed = event.getAttributeValue(QName{name: "speed"})
                                    }
                                    else if (event.qname.name == "wind") {
                                        wind = Wind {
                                            angle: event.getAttributeValue(QName{name: "direction"})
                                            speed: event.getAttributeValue(QName{name: "speed"})
                                            unit: speed
                                        }
                                    }
                                    else if (event.qname.name == "condition") {
                                        insert Forecast {
                                            day: "Now"
                                            high: event.getAttributeValue(QName{name: "temp"})
                                            text: event.getAttributeValue(QName{name: "text"})
                                            code: event.getAttributeValue(QName{name: "code"})
                                            unit: temp
                                            wind: wind
                                        } into forecast
                                    }
                                    else if (event.qname.name == "forecast") {
                                        insert Forecast {
                                            day: event.getAttributeValue(QName{name: "day"})
                                            low: event.getAttributeValue(QName{name: "low"})
                                            high: event.getAttributeValue(QName{name: "high"})
                                            text: event.getAttributeValue(QName{name: "text"})
                                            code: event.getAttributeValue(QName{name: "code"})
                                            unit: temp
                                        } into forecast
                                    }
                                }
                            }
                        }.parse()
                    } finally {
                        input.close()
                    }
                }
            }.start()
        }
    }
    override function create() {
        Group {
            translateY: Config.SPACE
            content: [
                RoundRect {
                    node:Text {
                        content: bind location
                        fill: Config.FONT_COLOR
                        font: Config.LARGE_FONT
                    }
                },
                RoundRect {
                    visible: bind newForecast != null
                    fit: false
                    node: Text {
                        content: bind newForecast.day
                        fill: Config.FONT_COLOR
                        font: Config.SMALL_FONT
                    }
                    cursor: Cursor.HAND
                    onMousePressed:function(event) {
                        index = if (1 + index < sizeof forecast)
                        then 1 + index
                        else 0
                    }
                },
                Group {
                    translateY: Config.SPACE_DOUBLE + Config.LARGE_FONT.size
                    content: bind forecast
                }
            ]
        }
    }
}