import { cloneDeep } from 'lodash';
import fs from 'fs';
import md5File from 'md5-file';
import * as path from 'path';
import fsExtra from 'fs-extra';

import { ResourceHashItem } from './models/ResourceHash';
import * as utils from './utils';
import { yarleOptions } from './yarle';
import { OutputFormat } from './output-format';
import { EvernoteNoteData } from './models';

const getResourceWorkDirs = (note: EvernoteNoteData) => {
  const pathSepRegExp = new RegExp(`\\${path.sep}`, 'g');
  const relativeResourceWorkDir = utils.getRelativeResourceDir(note).replace(pathSepRegExp, yarleOptions.pathSeparator);
  const absoluteResourceWorkDir = utils.getAbsoluteResourceDir(note); // .replace(pathSepRegExp,yarleOptions.pathSeparator)

  return {absoluteResourceWorkDir, relativeResourceWorkDir};
};

export const processResources = (note: EvernoteNoteData): string => {
    let resourceHashes: any = {};
    let updatedContent = cloneDeep(note.content);
    const {absoluteResourceWorkDir, relativeResourceWorkDir} = getResourceWorkDirs(note);

    utils.loggerInfo(`relative resource work dir: ${relativeResourceWorkDir}`);
    utils.loggerInfo(`absolute resource work dir: ${absoluteResourceWorkDir}`);

    utils.clearResourceDir(note);
    if (Array.isArray(note.resource)) {
      for (const resource of note.resource) {
        resourceHashes = {
          ...resourceHashes,
          ...processResource(absoluteResourceWorkDir, resource)};
      }
    } else {
      resourceHashes = {
        ...resourceHashes,
        ...processResource(absoluteResourceWorkDir, note.resource)};
    }

    for (const hash of Object.keys(resourceHashes)) {
      updatedContent = addMediaReference(updatedContent, resourceHashes, hash, relativeResourceWorkDir);
    }

    return updatedContent;
  };

const addMediaReference = (content: string, resourceHashes: any, hash: any, workDir: string): string => {
  const src = `${workDir}${yarleOptions.pathSeparator}${resourceHashes[hash].fileName.replace(/ /g, '\ ')}`;
  utils.loggerInfo(`mediaReference src ${src} added`);
  let updatedContent = cloneDeep(content);
  const replace = `<en-media ([^>]*)hash="${hash}".([^>]*)>`;
  const re = new RegExp(replace, 'g');
  const matchedElements = content.match(re);

  const mediaType = matchedElements && matchedElements.length > 0 && matchedElements[0].split('type=');
  if (mediaType && mediaType.length > 1 && mediaType[1].startsWith('"image')) {
    const width = matchedElements[0].match(/width="(\w+)"/);
    const widthParam = width ? ` width="${width[1]}"` : '';

    const height = matchedElements[0].match(/height="(\w+)"/);
    const heightParam = height ? ` height="${height[1]}"` : '';

    updatedContent = content.replace(re, `<img src="${src}"${widthParam}${heightParam} alt="${resourceHashes[hash].fileName}">`);
  } else {
    updatedContent = content.replace(re, `<a href="${src}" type="file">${resourceHashes[hash].fileName}</a>`);
  }

  return updatedContent;
};

const processResource = (workDir: string, resource: any): any => {
    const resourceHash: any = {};
    const data = resource.data?.$text || '';

    const accessTime = utils.getTimeStampMoment(resource);
    const resourceFileProps = utils.getResourceFileProperties(workDir, resource);
    let fileName = resourceFileProps.fileName;

    // add time to ease the same name issue
    if (yarleOptions.outputFormat === OutputFormat.LogSeqMD) { fileName = `${accessTime.toDate().getTime()}_${fileName}` ; }

    const absFilePath = `${workDir}${path.sep}${fileName}`;

    fs.writeFileSync(absFilePath, data, 'base64');

    const atime = accessTime.valueOf() / 1000;
    fs.utimesSync(absFilePath, atime, atime);

    if (resource.recognition && fileName) {
      const hashIndex = resource.recognition.match(/[a-f0-9]{32}/);
      utils.loggerInfo(`resource ${fileName} addid in hash ${hashIndex}`);
      resourceHash[hashIndex as any] = {fileName, alreadyUsed: false} as ResourceHashItem;
    } else {
      const md5Hash = md5File.sync(absFilePath);
      resourceHash[md5Hash] = {fileName, alreadyUsed: false} as ResourceHashItem;
    }

    return resourceHash;
};

export const prepareContentByExtractingDataUrlResources = (
  note: EvernoteNoteData,
  content: string,
): string => {
  if (content.indexOf('src="data:') < 0 && content.indexOf('href="data:') < 0) {
    return content; // no data urls
  }

  const {absoluteResourceWorkDir, relativeResourceWorkDir} = getResourceWorkDirs(note);
  fsExtra.mkdirsSync(absoluteResourceWorkDir);
 
  // change links hrefs
  content = content.replace(/ (href)="data:([^;,]*)(;base64)?,([^"]*)"(.*?)<\/a>/g, (match,argument, mediatype, encoding, data, postfix) => {
    const fileName = createResourceFromData(argument, match, mediatype, encoding === ';base64', data, absoluteResourceWorkDir, note);
    const argValue = `${relativeResourceWorkDir}${yarleOptions.pathSeparator}${fileName}`;

    return `yarle-file-resource="true" ${argument}="${argValue}"${postfix}`;
  });
  // src|href="data:image/svg+xml;base64,..." --> src="resourceDir/fileName"
  return content.replace(/(src)="data:([^;,]*)(;base64)?,([^"]*)"/g, (match,argument, mediatype, encoding, data) => {
    const fileName = createResourceFromData(argument, match, mediatype, encoding === ';base64', data, absoluteResourceWorkDir, note);
    const argValue = `${relativeResourceWorkDir}${yarleOptions.pathSeparator}${fileName}`;

    return `yarle-file-resource="true" ${argument}="${argValue}"`;
  });
};

// returns filename of new resource
const createResourceFromData = (
  argument: string,
  match: string,
  mediatype: string,
  base64: boolean,
  data: string,
  absoluteResourceWorkDir: string,
  note: EvernoteNoteData,
): string => {
  const baseName = 'embedded'; // data doesn't seem to include useful base filename
  const extension = extensionForMimeType(mediatype) || '.dat';
  const index = utils.getFileIndex(absoluteResourceWorkDir, baseName);
  let fileName = index < 1 ? `${baseName}.${extension}` : `${baseName}.${index}.${extension}`;


  if (argument === 'href'){
    const baseNameCandidate = match.split("alt=\"")[1]?.split("\"")[0]
    if (baseNameCandidate)
    fileName = baseNameCandidate
  }
  const absFilePath = `${absoluteResourceWorkDir}${path.sep}${fileName}`;

  if (!base64 && !data.startsWith('&lt;svg')) { // TODO: handle <svg, tags, they may be checkboxes
    data = decodeURIComponent(data);
  }

  fs.writeFileSync(absFilePath, data, base64 ? 'base64' : undefined);
  utils.setFileDates(absFilePath, note.created, note.updated);

  utils.loggerInfo(`data url resource ${fileName} added`);

  return fileName;
};

const extensionForMimeType = (mediatype: string): string => {
  // image/jpeg or image/svg+xml or audio/wav or ...
  const subtype = mediatype.split('/').pop(); // jpeg or svg+xml or wav

  return subtype.split('+')[0]; // jpeg or svg or wav
};