denis-sokolov/portent

'use strict';

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

var Promise = require('promise');

var getFiles = require('../../util/get-files');

var filepath = function(p){
    // Remove leading slash
    p = p.substring(1);

    p += '.html';

    return p;
};

var scanDirAndIgnoreMissing = function(directoryPath){
    return Promise.denodeify(fs.readdir)(directoryPath)
        .then(null, function(error){
            if (error.code === 'ENOENT')
                return [];
            throw error;
        });
};

module.exports = function(directory){
    var pagesDirectory = directory + '/pages';
    var dirs = [__dirname, pagesDirectory];
    var errorDirectory = path.join(directory, 'errors');

    var getAllErrorTemplates = function(){
        return scanDirAndIgnoreMissing(errorDirectory)
            .then(function(listing){
                return listing
                    .filter(name => name.match(/^\d{3}\.html/))
                    .map(name => Number(name.substr(0, 3)));
            });
    };

    return {
        defaultDirs: function(){ return dirs; },

        errorAvailable: function(code){
            var possiblePath = path.join(errorDirectory, String(code) + '.html');
            return Promise.denodeify(fs.stat)(possiblePath)
                .then(function(){ return true; }, function(){ return false; });
        },

        errorDirs: function(){ return [errorDirectory].concat(dirs); },

        errorPath: function(code){
            return filepath('/' + String(code));
        },

        errors: getAllErrorTemplates,

        file: filepath,

        pages: function(){
            return getFiles(pagesDirectory, ['html']).then(function(paths){
                return paths
                    // Make paths relative to /pages
                    .map(function(p){ return p.substring(pagesDirectory.length + 1); })

                    // Remove .html extension
                    .map(function(p){ return p.substring(0, p.length - 5); });
            }).then(function(paths){
                return paths.map(function(p){
                    return p.replace(/(^|\/)index$/, '$1');
                });
            });
        }
    };
};