import { readFile, writeFile, existsSync } from 'fs'
import { IpcMainEvent } from 'electron'
import { LocalSoftwareWindow } from '../LocalSoftwareWindow'

const FONT_LIBRARY_FILE_PATH = './fontLibrary.json'

export class FontDesignWindow extends LocalSoftwareWindow {
  constructor (options = {}) {
    super('font-design.html', options )
  }

  bindIpcEvent(): void {
    this.webContents.ipc.on('LOAD_FONT_LIBRARY', this.load )
    this.webContents.ipc.on('SAVE_FONT_LIBRARY', this.save )
  }

  load(event: IpcMainEvent) {
    if (!existsSync(FONT_LIBRARY_FILE_PATH)) {
      event.returnValue = {}
      return
    }
    
    readFile(FONT_LIBRARY_FILE_PATH, 'utf8', (err, data) => {
      if (err) {
        console.error(err);
        
        event.returnValue = {}
      } else {
        event.returnValue = { data }
      }
    })
  }

  save(event: IpcMainEvent, fontLibrary: string) {
    if (!fontLibrary) {
      event.returnValue = { err: new Error('字库为空') }
      return
    }

    try {
      writeFile( FONT_LIBRARY_FILE_PATH, fontLibrary, 'utf8', () => event.returnValue = 'OK')
    } catch (err) {
      event.returnValue = { err }
    }
  }
}