const CoordSystem = require("../libs/coord-system");
const BBox = require("../libs/bbox");
const transfrom = require("../libs/transform");
// const SvgMapBuilder = require("./svg-map-builder");
const SvgNodes = require("./drawers/svg-nodes");
const adaptor = require("./helpers/style-adaptor");
const { extract_style_defs } = require('./helpers/style-defs');

module.exports = class SvgSaver {
	constructor(settings, style, bbox) {
		// Функция перевода координат из глобальных в локальные.
		const cs1 = new CoordSystem(bbox.l, bbox.t, bbox.r, bbox.b);
		const cs_mm = cs1.clone().flipy().moveto(0, 0).scale(settings.map_scale * 1000);
		const cs_ppu = cs_mm.clone().scale(settings.ppu);
		const csw = Math.abs(cs_mm.x1 - cs_mm.x0);
		const csh = Math.abs(cs_mm.y1 - cs_mm.y0);
		const bbox_ppu = BBox.fromLTRB(cs_ppu.x0, cs_ppu.y0, cs_ppu.x1, cs_ppu.y1);

		this.tr = transfrom.fromCoordSyses(cs1, cs_ppu);

		this.settings = settings
		this.style = adaptor.update_styles(style, settings.ppu);
		const defs = extract_style_defs(style)

		this.svg = SvgNodes.svg()
			.set_attr("width", csw + "mm")
			.set_attr("height", csh + "mm")
			.set_attr("viewBox", `${bbox_ppu.l} ${bbox_ppu.t} ${bbox_ppu.w()} ${bbox_ppu.h()}`);

		if (defs.length){
			this.svg.append(SvgNodes.node('defs', null, defs))
		}

		// console.log(style)
	}

	append_defs(defs) {
		this.svg.append(defs);
	}

	append_svg(svg) {
		this.svg.append(svg);
	}

	append_layer(layer) {
		this.append_defs(layer.defs);
		this.append_svg(layer.svg);
	}

	render() {
		return this.svg.render();
	}
};