package osm.jp.coverage.fuel;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import jp.co.areaweb.tools.database.DatabaseTool;

/**
 * PostGISデータをGeoJSONファイルに出力する。
 * 	出力ファイル名：	"fuel.json"
 * 	テーブル名：		t_fuel
 * 		fixed	OSMの周辺に存在するかどうか、存在しない場合は0,存在する場合は1。ブランド有りは５０。
 * 		geom	PostGIS形式の位置情報(4612:)
 * SELECT row_to_json(feature) FROM (
select 'Feature' As type, ST_AsGeoJSON(ST_Transform(t_fuel.geom,4326))::json As geometry, row_to_json((
   SELECT p FROM (SELECT t_fuel.idref, t_fuel.fixed) AS p)) AS properties From t_fuel) As feature
* 
 * @author yuu
 *
 */
public class ToGeoJSON {
    public static final String JSON_FILE_NAME = "fuel.json";

    public static void main (String[] argv) throws Exception {
        outputDb(DatabaseTool.openDb("postgis"));
    }

    public static void outputDb(Connection con) throws Exception {
        File csvFile = new File(JSON_FILE_NAME);
        try (BufferedWriter ow = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "UTF-8"))) {
            String line = "{" +
                "\"type\": \"FeatureCollection\"," +
                "\"features\": [";
            System.out.println(line);
            ow.write(line);
            ow.newLine();

            PreparedStatement ps8 = con.prepareStatement("SELECT row_to_json(feature) FROM (" 
                    + "select 'Feature' As type, ST_AsGeoJSON(ST_Transform(t_fuel.geom,4326))::json As geometry, row_to_json((" 
                    + "SELECT p FROM (SELECT t_fuel.idref, t_fuel.fixed) AS p)) AS properties From t_fuel) As feature");
            try (ResultSet rset8 = ps8.executeQuery()) {
                while (rset8.next()) {
                    line = rset8.getString(1);
                    System.out.println(line);
                    ow.write(line);
                    ow.newLine();
                }
            }
            line = "]}";
            System.out.println(line);
            ow.write(line);
            ow.newLine();
            ow.flush();
        }
    }
}