/*
See http://kvdb.net/projects/6pp on how to use this script.
*/

// Namespacing the code so the examples don't clash.
var net = {};
net.kvdb = {};
net.kvdb.Lookup = {};
var _lookup = net.kvdb.Lookup;

_lookup.isValidPostcode = function(postcode) {
	// Check if input is a valid 4PP of 6PP.
        return /^\d{4} ?$/.test(postcode) ||
               /^\d{4} ?[A-Za-z]{2}$/.test(postcode);
}

_lookup.lastLookup = null;
_lookup.fromPostcode = function(e) {
	// Only request a lookup if the user entered a new and valid postcode.
	var postcode = document.getElementById('postcode').value;
	var streetnumber = document.getElementById('streetnumber').value;
	if (this.isValidPostcode(postcode)) {
		// If the same postcode was already retrieved, skip.
		if (_lookup.lastLookup != postcode + streetnumber) {
			this.lookup();
		}
	} else {
		this.resetResults();
	}
	_lookup.lastLookup = postcode + streetnumber;
}

_lookup.lookup = function() {
	// Perform an address lookup based on postcode and -if entered- street number.

	// Clear the street / city result fields.
	this.resetResults();

	// Enable spinner, so the user knows the lookup is being performed.
	var spinner = document.getElementById("spinner");
	if (spinner) {
		spinner.style.display = '';
	}

	var streetnumber = document.getElementById('streetnumber').value;
	var postcode = document.getElementById('postcode').value;
	this.loadScript('http://6pp.kvdb.net/services/lookup?postcode=' + escape(postcode) + '&streetnumber=' + escape(streetnumber) + '&tg_format=json&jsonp=_lookup.showLookupResults');
}

_lookup.edit = function() {
	// Return street information with postcode + street number to improve the 6pp database.
        var postcode = document.getElementById('postcode').value;
	var streets = document.getElementById('streets');
        // But only if the user chose a street instead of the default text.
	if (streets.selectedIndex == 0) { return; }
	var straatnaam = streets.options[streets.selectedIndex].text;
	var city = document.getElementById('city').value;
	var streetnumber = document.getElementById('streetnumber').value;
	// After the submit, perform lookup again to get the new data.
	this.loadScript('http://6pp.kvdb.net/services/feedback?postcode=' + escape(postcode) + '&street=' + escape(straatnaam) + '&city=' + escape(city) + '&streetnumber=' + escape(streetnumber) + '&tg_format=json&jsonp=lookup');
}

_lookup.loadScript = function(url) {
        // Insert javascript dynamically for JSONP cross-site callback
	var script = document.createElement('script');
	script.type = 'text/javascript';
	script.src = url;
	document.getElementsByTagName('head')[0].appendChild(script);
}

_lookup.resetResults = function() {
	// Empty single street result field
	document.getElementById('street').value = "";
	// Empty multiple streets result listbox
	document.getElementById('streets').options.lenght = 0;
	// Empty city result field
	document.getElementById('city').value = "";
	// Hide the map
	var map = document.getElementById('map');
	if (map) {
		map.style.display = "none";
	}
        // Hide the unsure link
        document.getElementById('unsure').style.display = "none";
        // Hide the fix link
        document.getElementById('fix').style.display = "none";
        // Hide the add link
        document.getElementById('add').style.display = "none";
	// Hide the addanother link
	document.getElementById('addanother').style.display = "none";
}

_lookup.showSingleAddress = function() {
	// Hide the multiple address elements
	var streets = document.getElementById('streets');
	streets.style.display = 'none';
	// Show the single address elements
	var street = document.getElementById('street');
	street.style.display = '';
}

_lookup.showManyAddresses = function() {
	// Hide the single address elements
	var street = document.getElementById('street');
	street.style.display = 'none';
	// Show the multiple address elements
	var streets = document.getElementById('streets');
	streets.style.display = '';
}

_lookup.showLookupResults = function(json) {
	// Disable spinner
	var spinner = document.getElementById("spinner");
	if (spinner) {
		spinner.style.display = 'none';
	}

        if (json.result == 'Invalid input') {
            document.getElementById('city').value = "Ongeldige invoer";
            return;
        }
        var count = json.result.length;
	if (count == 0) {
		// No results found
	} else {
		// Always display the city
		document.getElementById('city').value = json.result[0].city;
		if (count == 1) {
			// There's exactly one address available.
			this.showSingleAddress();
			var street = json.result[0].street;
			var subtitle = json.result[0].subtitle;
			var street_id = json.result[0].street_id;
			var postcode_id = json.result[0].postcode_id;
			var postcode = document.getElementById('postcode').value;
			var chars = postcode.substr(4).replace(/^\s+/,'').replace(/\s+$/,'').toUpperCase();

			// On 6PP lookups, allow user to add unknown streets.
			if (!street && postcode.length >= 6) {
				street = "Straat onbekend";
				var add = document.getElementById('add');
				add.href = "http://6pp.kvdb.net/wiki/add?street=&postcode_id=" + postcode_id + "&chars=" + chars;
				add.style.display = "inline";
			}
			document.getElementById('street').value = street;
			document.getElementById('street').title = subtitle;
			if (street_id) {
				// Allow user to flag the street as possibly invalid (unsure).
				var unsure = document.getElementById('unsure');
				unsure.onclick = new Function("_lookup.unsureStreet(" + street_id +"); return false;");
				unsure.style.display = "inline";
				// Allow user to add an extra street in addition to the one(s) seen.
				var addanother = document.getElementById('addanother');
				addanother.href = "http://6pp.kvdb.net/wiki/add?street=&postcode_id=" + postcode_id + "&chars=" + chars;	
				addanother.style.display = "inline";
			}
		} else {
			// There are more known addresses for this postcode (+ street number). Show all options.
			this.showManyAddresses();
			var streets = document.getElementById('streets');
			streets.options[0] = new Option("Maak uw keuze uit " + count + " straten.", "Placeholder");
			for (var i = 0; i < count; i++)
			{
				var street = json.result[i].street;
				streets.options[i+1] = new Option(street, i);
			}
		}
		// Show geo-coordinates on a map, if available.
		var lat = json.result[0].geo_lat;
		var lng = json.result[0].geo_long;
		var map = document.getElementById('map');
		if (lat && lng && map) {
			map.style.display = "block";
			map.src = 'examples/kaart.php?size=small&lat=' + lat + '&long=' + lng;
		}
	}
}

_lookup.unsureStreet = function(street_id) {
	// User chose to flag this street as unsure.
	
	// Enable spinner, so the user knows the action is being performed.
	var spinner = document.getElementById("spinner");
	if (spinner) {
		spinner.style.display = '';
	}

	this.loadScript('http://6pp.kvdb.net/services/setstreet?id=' + street_id + '&unsure=True' + '&tg_format=json&jsonp=_lookup.unsureResults');

	// The unsure link is no longer required.
	var unsure = document.getElementById('unsure');
	unsure.style.display = "none";
}

_lookup.unsureResults = function(json) {
	// The street has been flagged unsure.

	// Disable spinner
	var spinner = document.getElementById("spinner");
	if (spinner) {
		spinner.style.display = 'none';
	}

	// Hope the user will fix the spotted error too.
	var fix = document.getElementById('fix');
	fix.href = "http://6pp.kvdb.net/wiki/edit?street_id=" + json.result.id;	
	fix.style.display = "inline";
}