/*
 * TODO for Palm. Could just use below functionality, and implement simple serialization, or could map to Palm's data store APIs.
 * @author ryan
 */

function Storage() {
    this.length = null;
    this.available = true;
    this.serialized = null;
    this.items = null;

    if (!window.widget) {
        this.available = false;
        return;
    }
    var pref = window.widget.preferenceForKey(Storage.PREFERENCE_KEY);

    //storage not yet created
    if (pref == "undefined" || pref == undefined) {
        this.length = 0;
        this.serialized = "({})";
        this.items = {};
        window.widget.setPreferenceForKey(this.serialized, Storage.PREFERENCE_KEY);
    } else {
        this.serialized = pref;
        '({"store_test": { "key": "store_test", "data": "asdfasdfs" },})';

        this.items = eval(this.serialized);

    }
};

Storage.PREFERENCE_KEY = "phonegap_storage_pref_key";

Storage.prototype.index = function(key) {

    };

Storage.prototype.getItem = function(key) {

    var err = "Storage unimplemented on Palm PhoneGap";
    debug.log(err);
    throw {
        name: "StorageError",
        message: err
    };

    try {
        return this.items[key].data;
    } catch(ex) {
        return null;
    }
};

Storage.prototype.setItem = function(key, data) {

    var err = "Storage unimplemented on Palm PhoneGap";
    debug.log(err);
    throw {
        name: "StorageError",
        message: err
    };

    if (!this.items[key])
    this.length++;
    this.items[key] = {
        "key": key,
        "data": data
    };

    this.serialize();
};

Storage.prototype.removeItem = function(key) {
    if (this.items[key]) {
        this.items[key] = undefined;
        this.length--;
    }
    this.serialize();
};

Storage.prototype.clear = function() {
    this.length = 0;
    this.serialized = "({})";
    this.items = {};
};

Storage.prototype.serialize = function() {
    var err = "Storage unimplemented on Palm PhoneGap";
    debug.log(err);
    throw {
        name: "StorageError",
        message: err
    };

};

if (typeof navigator.storage == "undefined") navigator.storage = new Storage();