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

import {mimeToExtension,templateData} from './report-template'
import fs from 'fs'
import { createReport } from 'docx-templates';
import qrcode from 'yaqrcode'
// แก้ package.json ของ LibreOfficeFileConverter
// https://github.com/microsoft/TypeScript/issues/52363#issuecomment-1659179354
import { LibreOfficeFileConverter } from 'libreoffice-file-converter';
const TEMPLATE_FOLDER_NAME = "templates/docx"

/**
 * docxTemplate Uses docx-template 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
 * @return {Promise<Uint8Array>} output buffer after apply template.
 */
export async function docxTemplateX(base: string=".", tdata: templateData, outputMediaType: string="docx"): Promise<Uint8Array> {
  try {
    let template = await fs.promises.readFile(`${base}/${TEMPLATE_FOLDER_NAME}/${tdata.template}.docx`)
    const buffer = await createReport({
      template,
      data: tdata.data,
      additionalJsContext: {
        qrCode: (contents: string, caption: string, size: number, width: number, height: number) => {
          const dataUrl = qrcode(contents, { size: size });
          const data = dataUrl.slice('data:image/gif;base64,'.length);
          return { width, height, data, extension: '.gif', caption };
        },
      }
    });
    if (outputMediaType === "docx")
      return buffer
    const libreOfficeFileConverter = new LibreOfficeFileConverter({
      childProcessOptions: {
        timeout: 60 * 1000,
      },
    });
    const lbuffer = await libreOfficeFileConverter.convertBuffer(Buffer.from(buffer), outputMediaType);
    return lbuffer

  } catch (e) {
    throw (e)
  }

}

/** javascript-obfuscator:disable
 * @swagger
 * /api/v1/report-template/docx:
 *   get:
 *     summary: แสดงรายการ template ที่มีในโฟลเดอร์ templates
 *     tags: [report-template]
 *     responses:
 *       200:
 *         description: array of template
 *         content:
 *           applicatin/json:
 *             schema:
 *               type: array
 *               items: 
 *                 type: string
 *             example: ["hello"]
 *       500:
 *         description: Server error
*/
docxTemplateRoute.get("/", async function (req, res) {
  try {
    const fileList = await fs.promises.readdir(`./${TEMPLATE_FOLDER_NAME}`)
    const templateList = fileList.map((f) => f.split('.docx')[0])
    res.send(templateList)
  } catch (ex) {
    res.statusCode = 500;
    res.statusMessage = 'Internal Server Error';
    res.end(res.statusMessage);
    console.error('Error during get template list: ', ex);
  }
})


/** javascript-obfuscator:disable
 * @swagger
 * /api/v1/report-template/docx:
 *   post:
 *     summary: สร้างเอกสารโดยใช้ template จากไฟล์ docx จะแทนค่าตัวแปรในเอกสาร หรือจะแปลงเป็นฟอร์แม็ตอื่นได้ด้วยรองรับ docx pdf odt, ค่า template เป็นชื่อของ template, reportName เป็นชื่อไฟล์ที่ต้องการ
 *     tags: [report-template]
 *     requestBody:
 *       required: true
 *       content:
 *         application/json:
 *           schema:
 *             $ref: '#/components/schemas/templateData'
 *           example:
 *             template: hello
 *             reportName: docx-report
 *             data: {"docNo":"๑๒๓๔๕","me": "กระผม","prefix": "นาย","name": "สรวิชญ์","surname": "พลสิทธิ์","position": "Chief Technology Officer","org": {"type": "บริษัท","name": "เฟรปเป้ที","url": "https://frappet.com"},"employees": [{"name": "ภาวิชญ์","surname": "พลสิทธิ์"},{"name": "วิชญาภา","surname": "พลสิทธิ์"}]}
 *     responses:
 *       201:
 *         description: เอกสารถูกสร้างขึ้น
 *         content:
 *           application/vnd.openxmlformats-officedocument.wordprocessingml.document:
 *             schema:
 *               type: string
 *               format: binary
 *           application/pdf:
 *             schema:
 *               type: string
 *               format: binary
 *           application/vnd.oasis.opendocument.text:
 *             schema:
 *               type: string
 *               format: binary
 *           image/png:
 *             schema:
 *               type: string
 *               format: binary
 *           image/jpeg:
 *             schema:
 *               type: string
 *               format: binary
 *       500:
 *         description: Server error
 *
 */
docxTemplateRoute.post("/", async function (req, res) {
  try {
    if (!req.headers['content-type'] || !req.headers['accept'])
      throw new Error("Require header content-type, accept")
    let inputType = mimeToExtension(req.headers['content-type']);
    let outputMediaType = mimeToExtension(req.headers['accept']);
    console.log('content-type: ', inputType);
    console.log('accept: ', outputMediaType);
    let buffer = await docxTemplateX('.', req.body, outputMediaType)
    res.statusCode = 201;
    res.setHeader('Content-Type', req.headers['accept']);
    res.setHeader('Content-Disposition', `attachment;filename=${req.body.reportName}.${outputMediaType}`);
    res.setHeader('Content-Length', buffer.length);
    res.end(buffer);
  } catch (ex) {
    res.statusCode = 500;
    res.statusMessage = 'Internal Server Error during get docx template list';
    res.end(res.statusMessage);
    console.error('Error during apply template: ', ex);
  }

})