#!/usr/bin/env gjs

/* -*- Mode: JS2; indent-tabs-mode: nil; js2-basic-offset: 4 -*- */
/* vim: set et ts=4 sw=4: */
/*
 * Copyright (c) 2016 Marcus Lundblad.
 *
 * GNOME Maps is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * GNOME Maps is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with GNOME Maps; if not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Marcus Lundblad <ml@update.uu.se>
 */

/*
 * Script to generate a simplified JSON mapping file for POI types from the
 * presets definitions from the iD Web-based OpenStreetMap editor
 * 
 * Usage: ./extractPoiTypesFromID.js <path to iD checkout> > osm-types.json
 *
 */

const Gio = imports.gi.Gio;

const ByteArray = imports.byteArray;

const PRESETS_PATH = 'data/presets/presets';
const LOCALES_PATH = 'dist/locales';
const PRESET_TYPES = [ 'aeroway',
                       'amenity',
                       'leisure',
                       'office',
                       'place',
                       'shop',
                       'tourism' ];

const OUTPUT = {};

function getBufferText(buffer) {
    if (buffer instanceof Uint8Array) {
        return ByteArray.toString(buffer);
    } else {
        return buffer.toString();
    }
}

function parseJson(dirPath, fileName) {
    let file = Gio.File.new_for_path(dirPath + '/' + fileName);
    let [status, buffer] = file.load_contents(null);
    let {tags, name} = JSON.parse(getBufferText(buffer));

    for (let key in tags) {
        let value = tags[key];

        OUTPUT[key + '/' + value] = {'title': {'C': name}};
    }
}

function processType(type, basePath) {
    let dirPath = [basePath, PRESETS_PATH, type].join('/');
    let dir = Gio.File.new_for_path(dirPath);
    let enumerator =
        dir.enumerate_children('*',
                               Gio.FileQueryInfoFlags.NOFOLLOW_SYMLINKS, null);

    while (true) {
        let file = enumerator.next_file(null);

        if (file === null)
            break;

        if (file.get_name().endsWith('.json'))
            parseJson(dirPath, file.get_name());
    }
}

function processTypes(basePath) {
    PRESET_TYPES.forEach(function(type) {
        processType(type, basePath);
    });
}

function processLocale(dirPath, fileName) {
    let file = Gio.File.new_for_path(dirPath + '/' + fileName);
    let [status, buffer] = file.load_contents(null);
    let object = JSON.parse(getBufferText(buffer));
    let lang = fileName.substring(0, fileName.indexOf('.json'));

    for (let type in OUTPUT) {
        let name;

        try {
            name = object[lang].presets.presets[type].name;
        } catch (ex) {
            continue;
        }

        OUTPUT[type].title[lang] = name;
    }
}

function processLocales(basePath) {
    let dirPath = basePath + '/' + LOCALES_PATH;
    let dir = Gio.File.new_for_path(dirPath);
    let enumerator =
        dir.enumerate_children('*.json',
                               Gio.FileQueryInfoFlags.NOFOLLOW_SYMLINKS, null);

    while (true) {
        let file = enumerator.next_file(null);

        if (file === null)
            break;

        if (file.get_name().endsWith('.json'))
            processLocale(dirPath, file.get_name());
    }
}

function outputJson() {
    print(JSON.stringify(OUTPUT, null, 2));
}

function main(args) {
    let path = args[0];

    processTypes(path);
    processLocales(path);

    outputJson();
}

main(ARGV);