import path from "node:path";
import * as fs from "node:fs";
import svg2img from "svg2img";
import {IconCache} from "./IconCache";

export class IconDeployer {
  static ICON_PATH = path.resolve('public/icons')
  
  constructor(
    private readonly iconCache: IconCache
  ) {}
  
  public async ensureExistance() {
    const directory = await fs.promises.opendir(IconDeployer.ICON_PATH);
    const addIconPromises: Promise<void>[] = [];
    for await (const dirname of directory) {
      const iconName = path.basename(dirname.name, '.svg').replaceAll('-','_');
      
      if (this.iconCache.get(iconName) !== null) {
        continue;
      }
      
      addIconPromises.push(
        this.addIcon(path.resolve(dirname.parentPath, dirname.name), iconName)
      );
    }
    
    await Promise.all(addIconPromises);
  }
  
  private async addIcon(iconPath: string, iconName: string) {
    const svgBuffer = await fs.promises.readFile(iconPath, 'utf-8');
    const pngBuffer = await new Promise<Buffer>(resolve => {
        svg2img(
          svgBuffer,
          {
            format: "png",
            resvg: {
              fitTo: {
                mode: "width",
                value: 128
              }
            }
          },
          function (_err, buffer) {
            resolve(buffer);
          }
        )
      }
    )
    
    await this.iconCache.set(iconName, pngBuffer);
    
  }
}