/*
Copyright (c) 2015, Aaron van Geffen
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted
provided that the following conditions are met:

- Redistributions of source code must retain the above copyright notice, this list of conditions
  and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice, this list of conditions
  and the following disclaimer in the documentation and/or other materials provided with the distribution.
*/

'use strict';

function AutoSuggest(opt) {
    if (typeof opt.inputElement === "undefined" || typeof opt.listElement === "undefined" || typeof opt.baseUrl === "undefined" || typeof opt.appendCallback === "undefined") {
        return;
    }

    this.input = document.getElementById(opt.inputElement);
    this.input.autocomplete = "off";
    this.list = document.getElementById(opt.listElement);
    this.appendCallback = opt.appendCallback;
    this.baseurl = opt.baseUrl;

    var self = this;
    this.input.addEventListener('keydown', function(event) {
        self.doSelection(event);
    }, false);
    this.input.addEventListener('keyup', function(event) {
        self.onType(this, event);
    }, false);
}

AutoSuggest.prototype.doSelection = function(event) {
    if (typeof this.container === "undefined" || this.container.children.length === 0) {
        return;
    }

    switch (event.keyCode) {
        case 13: // Enter
            event.preventDefault();
            this.container.children[this.selectedIndex].click();
            break;

        case 38: // Arrow up
        case 40: // Arrow down
            event.preventDefault();
            this.findSelectedElement().className = '';
            this.selectedIndex += event.keyCode === 38 ? -1 : 1;
            if (this.selectedIndex < 0) {
                this.selectedIndex = this.container.children.length - 1;
            } else if (this.selectedIndex === this.container.children.length) {
                this.selectedIndex = 0;
            }
            var new_el = this.findSelectedElement().className = 'selected';
            break;
    }
};

AutoSuggest.prototype.findSelectedElement = function() {
    return this.container.children[this.selectedIndex];
};

AutoSuggest.prototype.onType = function(input, event) {
    if (event.keyCode === 13 || event.keyCode === 38 || event.keyCode === 40) {
        return;
    }

    var tokens = input.value.split(/\s+/).filter(function(token) {
        return token.length >= 3;
    });

    if (tokens.length === 0) {
        if (typeof this.container !== "undefined") {
            this.clearContainer();
        }
        return false;
    }

    var request_uri = this.baseurl + '/suggest/?type=tags&data=' + window.encodeURIComponent(tokens.join(" "));
    var request = new HttpRequest('get', request_uri, {}, this.onReceive, this);
};

AutoSuggest.prototype.onReceive = function(response, self) {
    self.openContainer();
    self.clearContainer();
    self.fillContainer(response);
};

AutoSuggest.prototype.openContainer = function() {
    if (this.container) {
        if (!this.container.parentNode) {
            this.input.parentNode.appendChild(this.container);
        }
        return this.container;
    }

    this.container = document.createElement('ul');
    this.container.className = 'autosuggest';
    this.input.parentNode.appendChild(this.container);
    return this.container;
};

AutoSuggest.prototype.clearContainer = function() {
    while (this.container.children.length > 0) {
        this.container.removeChild(this.container.children[0]);
    }
};

AutoSuggest.prototype.clearInput = function() {
    this.input.value = "";
    this.input.focus();
};

AutoSuggest.prototype.closeContainer = function() {
    this.container.parentNode.removeChild(this.container);
};

AutoSuggest.prototype.fillContainer = function(response) {
    var self = this;
    this.selectedIndex = 0;
    response.items.forEach(function(item, i) {
        var node = document.createElement('li');
        var text = document.createTextNode(item.label);
        node.jsondata = item;
        node.addEventListener('click', function(event) {
            self.appendCallback(this.jsondata);
            self.closeContainer();
            self.clearInput();
        });
        node.appendChild(text);
        self.container.appendChild(node);
        if (self.container.children.length === 1) {
            node.className = 'selected';
        }
    });
};


function TagAutoSuggest(opt) {
    AutoSuggest.prototype.constructor.call(this, opt);
    this.type = "tags";
}

TagAutoSuggest.prototype = Object.create(AutoSuggest.prototype);

TagAutoSuggest.prototype.constructor = TagAutoSuggest;

TagAutoSuggest.prototype.fillContainer = function(response) {
    if (response.items.length > 0) {
        AutoSuggest.prototype.fillContainer.call(this, response);
    } else {
        var node = document.createElement('li')
        node.innerHTML = "<em>Tag does not exist yet. Create it?</em>";

        var self = this;
        node.addEventListener('click', function(event) {
            self.createNewTag(function(response) {
                console.log('Nieuwe tag!!');
                console.log(response);
                self.appendCallback(response);
            });
            self.closeContainer();
            self.clearInput();
        });

        self.container.appendChild(node);
        this.selectedIndex = 0;
        node.className = 'selected';
    }
};

TagAutoSuggest.prototype.createNewTag = function(callback) {
    var request_uri = this.baseurl + '/managetags/?create';
    var request = new HttpRequest('post', request_uri, 'tag=' + encodeURIComponent(this.input.value), callback, this);
}