/** 
 * Simple test to open an mbtiles file and to generate TileJSON info object (available at index.json).
 */

require('sqlite3').verbose();
import http = require('http');
import path = require('path');
import express = require('express');

var MBTiles = require('mbtiles');

// Point this to an mbtiles file (you can download them from http://osm2vectortiles.org)
var sourceURI = '/dev/web/cs/csWeb-tile/tilesources/tm2/world.tm2/world.mbtiles';

// TODO Would it help if we use compression?
var app = express();
app.disable('x-powered-by');
app.set('port', 9000);

var world: any;
new MBTiles(sourceURI, function(err, mbtiles) {
    if (err) throw err;
    world = mbtiles;
});

var tilePattern = `/:z/:x/:y.pbf`;

var populateHeaders = function(headers, params, extras) {
    Object.keys(extras || {}).forEach(function(k) {
        params[k] = extras[k];
    });

    // Object.keys(templates).forEach(function(name) {
    //     var val = templates[name](params);

    //     if (val) {
    //         headers[name.toLowerCase()] = val;
    //     }
    // });

    return headers;
};

app.get('/index.json', function(req, res, next) {
    var params = {
        tileJSON: true
    };

    world.getInfo((err, tileSourceInfo) => {
        if (err) throw err;

        var info: {
            name?: string;
            center?: number[];
            bounds?: number[];
            minzoom?: number;
            maxzoom?: number;
            format?: string;
            tiles?: string[];
            tilejson?: string;
            vector_layers?: string;
            [key: string]: any
        };
        info = {};

        Object.keys(tileSourceInfo).forEach(function(key) {
            info[key] = tileSourceInfo[key];
        });

        info.format = 'pbf';

        if (info.vector_layers) {
            info.format = 'pbf';
        }

        info.name = info.name || 'Untitled';
        info.center = info.center || [-122.4440, 37.7908, 12];
        info.bounds = info.bounds || [-180, -85.0511, 180, 85.0511];
        info.format = info.format || 'png';
        info.minzoom = Math.max(0, info.minzoom | 0);
        info.maxzoom = info.maxzoom || Infinity;
        var uri = ('http://' + req.headers['host'] + (path.dirname(req.originalUrl) + '/{z}/{x}/{y}.pbf').replace(/\/+/g, '/');

        info.tiles = [uri];
        info.tilejson = '2.0.0';

        res.set(populateHeaders({}, params, { 200: true }));
        return res.send(info);
    });
});

app.get(tilePattern, function(req, res, next) {
    let z = +req.params.z,
        x = +req.params.x,
        y = +req.params.y;

    world.getTile(z, x, y, function(err, data, headers) {
        if (err || data == null) {
            return res.status(404).send('Not found');
        } else {
            res.set(headers);
            return res.status(200).send(data);
        }
    });
});

http.createServer(app).listen(app.get('port'), () => {
    console.log('Express server listening on port ' + app.get('port'));
});