import express from 'express'
export const xlsxTemplateRoute = express.Router();

import {mimeToExtension,templateData} from './report-template'
import { ExcelTemplate } from 'xlsx-template-next'
import fs from 'fs'
import { LibreOfficeFileConverter } from 'libreoffice-file-converter';
const TEMPLATE_FOLDER_NAME = "templates/xlsx"

/**
 * xlsxTemplate Uses xlsx-template-next to convert input data and template to output buffer. 
 * You have to handle exception throw by function
 * template keep in folder templates
 * @param {String} base  base path of caller relate to template-docx foler (no trail slash)
 * @param {templateData} tdata Template Information in JSON format
 * @param {String} outputMediaType output extension
 * @param {Number} tab tab page of spread sheet , default = 1
 * @return {Promise<Uint8Array>} output buffer after apply template.
 */
export async function xlsxTemplateX(base: string=".", tdata: templateData, outputMediaType: string="xlsx",tab:number=1): Promise<Uint8Array> {
    try {
      const template = new ExcelTemplate();
      let templateBuff = await fs.promises.readFile(`${base}/${TEMPLATE_FOLDER_NAME}/${tdata.template}.xlsx`)
      await template.load(templateBuff);
      await template.process(tab,tdata.data)
      const buffer = await template.build({ type: 'uint8array' })
      if (outputMediaType === "xlsx")
        return buffer as Uint8Array
      const libreOfficeFileConverter = new LibreOfficeFileConverter({
        childProcessOptions: {
          timeout: 60 * 1000,
        },
      });
      const lbuffer = await libreOfficeFileConverter.convertBuffer(Buffer.from(buffer as Uint8Array), outputMediaType);
      return lbuffer
  
    } catch (e) {
      throw (e)
    }
  
  }
  
  /** javascript-obfuscator:disable
 * @swagger
 * /api/v1/report-template/xlsx:
 *   get:
 *     summary: แสดงรายการ xlsx template
 *     tags: [report-template]
 *     responses:
 *       200:
 *         description: array of template
 *         content:
 *           applicatin/json:
 *             schema:
 *               type: array
 *               items: 
 *                 type: string
 *             example: ["hello"]
 *       500:
 *         description: Server error
*/
xlsxTemplateRoute.get("/", async function (req, res) {
  try {
    const fileList = await fs.promises.readdir(`./${TEMPLATE_FOLDER_NAME}`)
    const templateList = fileList.map((f) => f.split('.xlsx')[0])
    res.send(templateList)
  } catch (ex) {
    res.statusCode = 500;
    res.statusMessage = 'Internal Server Error during get xlsx template list';
    res.end(res.statusMessage);
    console.error('Error during get template list: ', ex);
  }
})

/** javascript-obfuscator:disable
 * @swagger
 * /api/v1/report-template/xlsx:
 *   post:
 *     summary: สร้าองเอกสารจาก xlsx template แล้วส่งกลับมาเป็น xlsx pdf odt
 *     tags: [report-template]
 *     requestBody:
 *       required: true
 *       content:
 *         application/json:
 *           schema:
*             $ref: '#/components/schemas/templateData'
 *           example:
 *             template: hello
 *             reportName: xlsx-report
 *             data: {"docNo": "๑๒๓๔๕","me": "กระผม","prefix": "นาย","name": "สรวิชญ์","surname": "พลสิทธิ์","position": "Chief Technology Officer","org": {"type": "บริษัท","name": "เฟรปเป้ที","url": "https://frappet.com"},"employees": [{"id":1,"name": "ภาวิชญ์","surname": "พลสิทธิ์","score":80},{"id":2,"name": "วิชญาภา","surname": "พลสิทธิ์","score":50},{"id":3,"name": "ฐิตาภา","surname": "พลสิทธิ์","score":90},{"id":4,"name": "สรวิชญ์ พลสิทธิ์","surname": "พลสิทธิ์","score":99}]}
 *     responses:
 *       201:
 *         description: เอกสารถูกสร้างขึ้น created.
 *         content:
 *           application/vnd.openxmlformats-officedocument.spreadsheetml.sheet:
 *             schema:
 *               type: string
 *               format: binary
 *           application/pdf:
 *             schema:
 *               type: string
 *               format: binary
 *           application/vnd.oasis.opendocument.spreadsheet:
 *             schema:
 *               type: string
 *               format: binary
 *           image/png:
 *             schema:
 *               type: string
 *               format: binary
 *           image/jpeg:
 *             schema:
 *               type: string
 *               format: binary
 *       500:
 *         description: Server error
 *
 */
xlsxTemplateRoute.post("/", async function (req, res) {
  try {
    if (!req.headers['content-type'] || !req.headers['accept'])
      throw new Error("Require header content-type, accept")
    let inputType = mimeToExtension(req.headers['content-type']);
    let outputMediaType = mimeToExtension(req.headers['accept']);
    console.log('content-type: ', inputType);
    console.log('accept: ', outputMediaType);
    let buffer = await xlsxTemplateX(".",req.body,outputMediaType)
    res.statusCode = 201;
    res.setHeader('Content-Type', req.headers['accept']);
    res.setHeader('Content-Disposition', `attachment;filename=${req.body.reportName}.${outputMediaType}`);
    res.setHeader('Content-Length', buffer.length);
    res.end(buffer);
  } catch (ex) {
    res.statusCode = 500;
    res.statusMessage = 'Internal Server Error';
    res.end(res.statusMessage);
    console.error('Error during apply template: ', ex);
  }

})