var jju = require('../')
  , fs  = require('fs')

// this function registers json5 extension, so you
// can do `require("./config.json5")` kind of thing
module.exports.register = function() {
	var r = require, e = 'extensions'
	r[e]['.json5'] = function(m, f) {
		/*eslint no-sync:0*/
		m.exports = jju.parse(fs.readFileSync(f, 'utf8'))
	}
}

// this function monkey-patches JSON.parse, so it
// will return an exact position of error in case
// of parse failure
module.exports.patch_JSON_parse = function() {
	var _parse = JSON.parse
	JSON.parse = function(text, rev) {
		try {
			return _parse(text, rev)
		} catch(err) {
			// this call should always throw
			require('jju').parse(text, {
				mode: 'json',
				legacy: true,
				reviver: rev,
				reserved_keys: 'replace',
				null_prototype: false,
			})

			// if it didn't throw, but original parser did,
			// this is an error in this library and should be reported
			throw err
		}
	}
}

// this function is an express/connect middleware
// that accepts uploads in application/json5 format
module.exports.middleware = function() {
	return function(req, res, next) {
		throw new Error('this function is removed, use express-json5 instead')
	}
}

