'use strict';

var fs = require('fs-extra');
var path = require('path');
var Writer = require('broccoli-writer');

function CustomReplace (inputTree, options) {
    if (!(this instanceof CustomReplace)) {
        return new CustomReplace(inputTree, options);
    }

    Writer.call(this, inputTree, options); // this._super();

    this.inputTree  = inputTree;
    this.options = options;
}
CustomReplace.prototype = Object.create(Writer.prototype);
CustomReplace.prototype.constructor = CustomReplace;

CustomReplace.prototype.write = function (readTree, destDir) {
    var inputDir;

    return readTree(this.inputTree)
        .then(function(path) {
            inputDir = path;

            return {
                inputDir: inputDir,
                destDir: destDir
            };
        })
        .then(this.process.bind(this));
};

CustomReplace.prototype.process = function(results) {
    var files = this.options.files;

    for (var i = 0, l = files.length; i < l; i++) {
        var file = files[i];
        var filePath = path.join(results.inputDir, file);
        var destPath = path.join(results.destDir, file);

        this.processFile(filePath, destPath);
    }
};

CustomReplace.prototype.processFile = function(filePath, destPath) {
    var contents = fs.readFileSync(filePath, { encoding: 'utf8' });

    for (var i = 0, l = this.options.patterns.length; i < l; i++) {
        // jshint loopfunc:true
        var pattern = this.options.patterns[i];
        var replacement = pattern.replacement;

        if (typeof pattern.replacement === 'function') {
            replacement = function() {
                var args = Array.prototype.slice.call(arguments);
                return pattern.replacement.apply(null, args);
            };
        }

        contents = contents.replace(pattern.match, replacement);
    }

    if (!fs.existsSync(path.dirname(destPath))) {
        fs.mkdirsSync(path.dirname(destPath));
    }
    fs.writeFileSync(destPath, contents, { encoding: 'utf8' });
};

module.exports = CustomReplace;