'use strict';

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var fs = require('fs');
var path = require('path');

function Token(_ref) {
    var begin = _ref.begin,
        end = _ref.end,
        offset = _ref.offset,
        value = _ref.value;

    this.begin = begin;
    this.end = end;
    this.offset = offset;
    this.value = value;
}

function inliner(fpath, callback) {
    if (!fpath || typeof fpath !== 'string') {
        return callback(new Error('[inline] expects first argument to be a string, ' + (typeof fpath === 'undefined' ? 'undefined' : _typeof(fpath)) + ' given'));
    }

    var re = /\brequire\s*\(\s*['"]([./]+[^'"]+)['"]\s*\)/g;
    var tokens = [];

    fs.readFile(path.resolve(fpath), 'utf8', function (err, _data) {
        if (err) {
            return callback(err);
        }

        var match = void 0;
        var offset = 0;
        while ((match = re.exec(_data)) !== null) {
            var _match = match,
                _match2 = _slicedToArray(_match, 2),
                requireDeclaration = _match2[0],
                relativePath = _match2[1];

            var dpath = path.resolve(path.resolve(path.dirname(fpath)), relativePath) + '.js';
            var required = require(dpath);
            var dependency = typeof required === 'function' ? String(required) : JSON.stringify(required);

            tokens.push(new Token({
                begin: match.index + offset,
                end: re.lastIndex + offset,
                offset: offset,
                value: dependency
            }));

            offset += dependency.length - requireDeclaration.length;
        }

        var token = void 0;
        var data = _data;
        while (token = tokens.shift()) {
            data = '' + data.slice(0, token.begin) + token.value + data.slice(token.end);
        }

        return callback(null, data);
    });
}

/* istanbul ignore next */
if (require.main === module) {
    // called from CLI
    if (process.argv && process.argv[2]) {
        inliner(process.argv[2], function (err, data) {
            if (err) {
                throw err;
            }
            process.stdout.write(data);
        });
    }
}

module.exports = inliner;