//compile doT templates to js functions 'use strict';

var glob = require('glob')

, fs = require('fs')
, path = require('path')
, doT = require('dot')
, beautify = require('js-beautify').js_beautify;

var defsRootPath = process.argv || path.join(__dirname, '../lib');

var defs = {}; var defFiles = glob.sync('./dot/*/.def', { cwd: defsRootPath }); defFiles.forEach(function (f) {

var name = path.basename(f, '.def');
defs[name] = fs.readFileSync(path.join(defsRootPath, f));

});

var filesRootPath = process.argv || path.join(__dirname, '../lib'); var files = glob.sync('./dot/*/.jst', { cwd: filesRootPath });

var dotjsPath = path.join(filesRootPath, './dotjs'); try { fs.mkdirSync(dotjsPath); } catch(e) {}

console.log('nnCompiling:');

var FUNCTION_NAME = /functions+anonymouss*(it*)s*{/; var OUT_EMPTY_STRING = /outs*+=s*'s*';/g; var ISTANBUL = /'(istanbul+)';/g; var ERROR_KEYWORD = /$errorKeyword/g; var ERROR_KEYWORD_OR = /$errorKeywords+||/g; var VARS = [

'$errs', '$valid', '$lvl', '$data', '$dataLvl',
'$errorKeyword', '$closingBraces', '$schemaPath',
'$validate'

];

files.forEach(function (f) {

var keyword = path.basename(f, '.jst');
var targetPath = path.join(dotjsPath, keyword + '.js');
var template = fs.readFileSync(path.join(filesRootPath, f));
var code = doT.compile(template, defs);
code = code.toString()
           .replace(OUT_EMPTY_STRING, '')
           .replace(FUNCTION_NAME, 'function generate_' + keyword + '(it, $keyword, $ruleType) {')
           .replace(ISTANBUL, '/* $1 */');
removeAlwaysFalsyInOr();
VARS.forEach(removeUnusedVar);
code = "'use strict';\nmodule.exports = " + code;
code = beautify(code, { indent_size: 2 }) + '\n';
fs.writeFileSync(targetPath, code);
console.log('compiled', keyword);

function removeUnusedVar(v) {
  v = v.replace(/\$/g, '\\$$');
  var regexp = new RegExp(v + '[^A-Za-z0-9_$]', 'g');
  var count = occurrences(regexp);
  if (count == 1) {
    regexp = new RegExp('var\\s+' + v + '\\s*=[^;]+;|var\\s+' + v + ';');
    code = code.replace(regexp, '');
  }
}

function removeAlwaysFalsyInOr() {
  var countUsed = occurrences(ERROR_KEYWORD);
  var countOr = occurrences(ERROR_KEYWORD_OR);
  if (countUsed == countOr + 1) code = code.replace(ERROR_KEYWORD_OR, '');
}

function occurrences(regexp) {
  return (code.match(regexp) || []).length;
}

});