/*
  This is the tagger script that updates the tag_databse file and logs stats for snippet tags.
  Run using `npm run tagger`.
*/
// Load modules
const fs = require('fs-extra'), path = require('path'), chalk = require('chalk');
// Set variables for paths
const snippetsPath = './snippets';
// Set variables for script
let snippets = {}, output = '', tagDbData = {}, missingTags = 0, tagDbStats = {};
// Load helper functions (these are from existing snippets in 30 seconds of code!)
const objectFromPairs = arr => arr.reduce((a, v) => (a[v[0]] = v[1], a), {});
const countOccurrences = (arr, value) => arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0);
// Start the timer of the script
console.time('Tagger');
// Synchronously read all snippets and sort them as necessary (case-insensitive)
try {
  let snippetFilenames = fs.readdirSync(snippetsPath);
  snippetFilenames.sort((a, b) => {
    a = a.toLowerCase();
    b = b.toLowerCase();
    if (a < b) return -1;
    if (a > b) return 1;
    return 0;
  });
  // Store the data read from each snippet in the appropriate object
  for(let snippet of snippetFilenames)  snippets[snippet] = fs.readFileSync(path.join(snippetsPath,snippet),'utf8');
}
catch (err){ // Handle errors (hopefully not!)
  console.log(`${chalk.red('ERROR!')} During snippet loading: ${err}`);
  process.exit(1);
}
// Load tag data from the database
try {
  tagDbData = objectFromPairs(fs.readFileSync('tag_database','utf8').split('\n').slice(0,-1).map(v => v.split(':').slice(0,2)));
  tagDbStats = Object.entries(tagDbData).sort((a,b) => a[1].localeCompare(b[1])).reduce((acc, val) => {acc.hasOwnProperty(val[1]) ? acc[val[1]]++ : acc[val[1]] = 1; return acc;}, {});
}
catch (err){ // Handle errors (hopefully not!)
  console.log(`${chalk.red('ERROR!')} During tag database loading: ${err}`);
  process.exit(1);
}
// Update the listing of snippets in tag_database and log the statistics, along with missing scripts
try {
  for(let snippet of Object.entries(snippets))
    if(tagDbData.hasOwnProperty(snippet[0].slice(0,-3)) && tagDbData[snippet[0].slice(0,-3)].trim())
      output += `${snippet[0].slice(0,-3)}:${tagDbData[snippet[0].slice(0,-3)].trim()}\n`;
    else {
      output += `${snippet[0].slice(0,-3)}:\n`;
      missingTags++;
      console.log(`${chalk.yellow('Tag missing:')} ${snippet[0].slice(0,-3)}`);
    }
  // Write to tag_database
  fs.writeFileSync('tag_database', output);
}
catch (err){  // Handle errors (hopefully not!)
  console.log(`${chalk.red('ERROR!')} During tag_database generation: ${err}`);
  process.exit(1);
}
// Log statistics for the tag_database file
console.log(`\n${chalk.bgWhite(chalk.black('=== TAG STATS ==='))}`)
for(let tagData of Object.entries(tagDbStats).filter(v => v[0] !== 'undefined'))
  console.log(`${chalk.green(tagData[0])}: ${tagData[1]} snippets`);
console.log(`${chalk.blue('Untagged snippets:')} ${missingTags}\n`);
// Log a success message
console.log(`${chalk.green('SUCCESS!')} tag_database file updated!`);
// Log the time taken
console.timeEnd('Tagger');