export default class Tilorswift
{
    static getTerrainAsJson(terrain)
    {
        let matrix = [];

        for (let y = 0; y < terrain.fields.length; y++) {
            let row = [];

            for (let x = 0; x < terrain.fields[y].length; x++) {
                row.push(terrain.fields[y][x].index);
            }

            matrix.push(row);
        }

        let data = {
            tileset: terrain.tileset.image.src,
            tiles: terrain.tileset.tiles,
            scale: terrain.tileset.scale,
            rows: terrain.tilesY,
            columns: terrain.tilesX,
            startX: terrain.entranceTileX,
            startY: terrain.entranceTileY,
            backgroundColor: terrain.backgroundColor,
            matrix: matrix,
        };

        return JSON.stringify(data);
    }

    static saveTerrainToFile(terrain)
    {
        if (!terrain.hasEntrancePoint()) {
            alert('Es muss ein Startpunkt definiert sein!');
            return;
        }

        let filename = prompt('Dateiname', 'terrain.json');

        if (filename === null) {
            return;
        }

        let json = Tilorswift.getTerrainAsJson(terrain);
        let download = document.createElement('a');

        download.setAttribute('download', filename);
        download.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(json));
        download.click();
        download.remove();
    }
}