/**
 * Copyright © Jordan Lee, Dave Perrett, Malcolm Jarvis and Bruno Bierbaumer
 *
 * This file is licensed under the GPLv2.
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */

function PrefsDialog(remote) {

    var data = {
        dialog: null,
        remote: null,
        elements: { },

        // all the RPC session keys that we have gui controls for
        keys: [
            'alt-speed-down',
            'alt-speed-time-begin',
            'alt-speed-time-day',
            'alt-speed-time-enabled',
            'alt-speed-time-end',
            'alt-speed-up',
            'blocklist-enabled',
            'blocklist-size',
            'blocklist-url',
            'dht-enabled',
            'download-dir',
            'encryption',
            'idle-seeding-limit',
            'idle-seeding-limit-enabled',
            'lpd-enabled',
            'peer-limit-global',
            'peer-limit-per-torrent',
            'peer-port',
            'peer-port-random-on-start',
            'pex-enabled',
            'port-forwarding-enabled',
            'rename-partial-files',
            'seedRatioLimit',
            'seedRatioLimited',
            'speed-limit-down',
            'speed-limit-down-enabled',
            'speed-limit-up',
            'speed-limit-up-enabled',
            'start-added-torrents',
            'utp-enabled'
        ],

        // map of keys that are enabled only if a 'parent' key is enabled
        groups: {
            'alt-speed-time-enabled': ['alt-speed-time-begin',
                                       'alt-speed-time-day',
                                       'alt-speed-time-end' ],
            'blocklist-enabled': ['blocklist-url',
                                  'blocklist-update-button' ],
            'idle-seeding-limit-enabled': [ 'idle-seeding-limit' ],
            'seedRatioLimited': [ 'seedRatioLimit' ],
            'speed-limit-down-enabled': [ 'speed-limit-down' ],
            'speed-limit-up-enabled': [ 'speed-limit-up' ]
        }
    },

    initTimeDropDown = function(e)
    {
        var i, hour, mins, value, content;

        for (i=0; i<24*4; ++i) {
            hour = parseInt(i/4, 10);
            mins = ((i%4) * 15);
            value = i * 15;
            content = hour + ':' + (mins || '00');
            e.options[i] = new Option(content, value);
        }
    },

    onPortChecked = function(response)
    {
        var is_open = response['arguments']['port-is-open'],
            text = 'Port is <b>' + (is_open ? 'Open' : 'Closed') + '</b>',
            e = data.elements.root.find('#port-label');
        setInnerHTML(e[0],text);
    },

    setGroupEnabled = function(parent_key, enabled)
    {
        var i, key, keys, root;

        if (parent_key in data.groups)
        {
            root = data.elements.root,
            keys = data.groups[parent_key];

            for (i=0; key=keys[i]; ++i)
                root.find('#'+key).attr('disabled',!enabled);
        }
    },

    onBlocklistUpdateClicked = function ()
    {
        data.remote.updateBlocklist();
        setBlocklistButtonEnabled(false);
    },
    setBlocklistButtonEnabled = function(b)
    {
        var e = data.elements.blocklist_button;
        e.attr('disabled',!b);
        e.val(b ? 'Update' : 'Updating...');
    },

    getValue = function(e)
    {
        var str;

        switch (e[0].type)
        {
            case 'checkbox':
            case 'radio':
                return e.prop('checked');

            case 'text':
            case 'select-one':
                str = e.val();
                if( parseInt(str,10).toString() === str)
                    return parseInt(str,10);
                if( parseFloat(str).toString() === str)
                    return parseFloat(str);
                return str;

            default:
                return null;
        }
    },

    /* this callback is for controls whose changes can be applied
       immediately, like checkboxs, radioboxes, and selects */
    onControlChanged = function(ev)
    {
        var o = {};
        o[ev.target.id] = getValue($(ev.target));
        data.remote.savePrefs(o);
    },
        
    /* these two callbacks are for controls whose changes can't be applied
       immediately -- like a text entry field -- because it takes many
       change events for the user to get to the desired result */
    onControlFocused  = function(ev)
    {
        data.oldValue = getValue($(ev.target));
    },
    onControlBlurred  = function(ev)
    {
        var newValue = getValue($(ev.target));
        if (newValue !== data.oldValue)
        {
            var o = {};
            o[ev.target.id] = newValue;
            data.remote.savePrefs(o);
            delete data.oldValue;
        }
    },

    getDefaultMobileOptions = function()
    {
        return {
            width: $(window).width(),
            height: $(window).height(),
            position: [ 'left', 'top' ]
        };
    },

    initialize = function (remote)
    {
        var i, key, e, o;

        data.remote = remote;

        e = $('#prefs-dialog');
        data.elements.root = e;

        initTimeDropDown(e.find('#alt-speed-time-begin')[0]);
        initTimeDropDown(e.find('#alt-speed-time-end')[0]);

        o = isMobileDevice
          ? getDefaultMobileOptions()
          : { width: 350, height: 400 };
        o.autoOpen = false;
        o.show = 'fade';
        o.hide = 'fade';
        o.close = onDialogClosed;
        e.tabbedDialog(o);

        e = e.find('#blocklist-update-button');
        data.elements.blocklist_button = e;
        e.click(onBlocklistUpdateClicked);

        // listen for user input
        for (i=0; key=data.keys[i]; ++i)
        {
            e = data.elements.root.find('#'+key);
            switch (e[0].type)
            {
                case 'checkbox':
                case 'radio':
                case 'select-one':
                    e.change(onControlChanged);
                    break;

                case 'text':
                    e.focus(onControlFocused);
                    e.blur(onControlBlurred);

                default:
                    break;
            }
        }
    },

    getValues = function()
    {
        var i, key, val, o={},
            keys = data.keys,
            root = data.elements.root;

        for (i=0; key=keys[i]; ++i) {
            val = getValue(root.find('#'+key));
            if (val !== null)
                o[key] = val;
        }

        return o;
    },

    onDialogClosed = function()
    {
        window.scrollTo(0,1);
        $(data.dialog).trigger('closed', getValues());
    };

    /****
    *****  PUBLIC FUNCTIONS
    ****/

    // update the dialog's controls
    this.set = function (o)
    {
        var e, i, key, val, option,
            keys = data.keys,
            root = data.elements.root;

        setBlocklistButtonEnabled(true);

        for (i=0; key=keys[i]; ++i)
        {
            val = o[key];
            e = root.find('#'+key);

            if (key === 'blocklist-size')
            {
                // special case -- regular text area
                e.text('' + val.toStringWithCommas());
            }
            else switch (e[0].type)
            {
                case 'checkbox':
                case 'radio':
                    e.prop('checked', val);
                    setGroupEnabled(key, val);
                    break;
                case 'text':
                    // don't change the text if the user's editing it.
                    // it's very annoying when that happens!
                    if (e[0] !== document.activeElement)
                        e.val(val);
                    break;
                case 'select-one':
                    e.val(val);
                    break;
                default:
                    break;
            }
        }
    };

    this.show = function ()
    {
        window.scrollTo(0,1);

        setBlocklistButtonEnabled(true);
        data.remote.checkPort(onPortChecked,this);
        data.elements.root.dialog('open');
    };

    this.shouldAddedTorrentsStart = function()
    {
        return data.elements.root.find('#start-added-torrents')[0].checked;
    };

    data.dialog = this;
    initialize (remote);
};