(function() {

  window.db = {};

  window.db.get_or_create = function(callback) {
    var request;
    request = indexedDB.open('graph_immutables', 2);
    request.onupgradeneeded = function() {
      /* called whenever the DB changes version. triggers when the DB is created
      */
      var db, store;
      db = request.result;
      store = db.createObjectStore('graph', {
        keyPath: 'id'
      });
      /* initial fake data
      */
      store.put({
        id: 0,
        data: {
          nodes: [
            {
              id: 'A',
              x: 469,
              y: 410,
              type: 'X',
              editable: false
            }, {
              id: 'B',
              x: 493,
              y: 364,
              type: 'X',
              editable: false
            }, {
              id: 'C',
              x: 442,
              y: 365,
              type: 'X',
              editable: false
            }, {
              id: 'D',
              x: 467,
              y: 314,
              type: 'X',
              editable: false
            }, {
              id: 'E',
              x: 477,
              y: 248,
              type: 'Y',
              editable: true
            }, {
              id: 'F',
              x: 425,
              y: 207,
              type: 'Y',
              editable: false
            }, {
              id: 'G',
              x: 402,
              y: 155,
              type: 'Y',
              editable: false
            }, {
              id: 'H',
              x: 369,
              y: 196,
              type: 'Y',
              editable: false
            }, {
              id: 'I',
              x: 350,
              y: 148,
              type: 'Z',
              editable: false
            }, {
              id: 'J',
              x: 539,
              y: 222,
              type: 'Z',
              editable: false
            }, {
              id: 'K',
              x: 594,
              y: 235,
              type: 'Z',
              editable: false
            }, {
              id: 'L',
              x: 582,
              y: 185,
              type: 'Z',
              editable: false
            }, {
              id: 'M',
              x: 633,
              y: 200,
              type: 'Z',
              editable: false
            }
          ],
          links: [
            {
              source: 'A',
              target: 'B',
              editable: false
            }, {
              source: 'B',
              target: 'C',
              editable: true
            }, {
              source: 'C',
              target: 'A',
              editable: false
            }, {
              source: 'B',
              target: 'D',
              editable: false
            }, {
              source: 'D',
              target: 'C',
              editable: false
            }, {
              source: 'D',
              target: 'E',
              editable: true
            }, {
              source: 'E',
              target: 'F',
              editable: true
            }, {
              source: 'F',
              target: 'G',
              editable: false
            }, {
              source: 'F',
              target: 'H',
              editable: false
            }, {
              source: 'G',
              target: 'H',
              editable: true
            }, {
              source: 'G',
              target: 'I',
              editable: false
            }, {
              source: 'H',
              target: 'I',
              editable: false
            }, {
              source: 'J',
              target: 'E',
              editable: true
            }, {
              source: 'J',
              target: 'L',
              editable: false
            }, {
              source: 'J',
              target: 'K',
              editable: false
            }, {
              source: 'K',
              target: 'L',
              editable: true
            }, {
              source: 'L',
              target: 'M',
              editable: false
            }, {
              source: 'M',
              target: 'K',
              editable: false
            }
          ],
          last_index: 0
        }
      });
      return console.log('Database created or upgraded.');
    };
    return request.onsuccess = function() {
      /* called when the connection with the DB is opened successfully
      */
      var cursorRequest, db, keyRange, store, tx;
      db = request.result;
      console.log('Database connection opened.');
      /* open a transaction
      */
      tx = db.transaction('graph', 'readwrite');
      store = tx.objectStore('graph');
      /* get everything in the store
      */
      keyRange = IDBKeyRange.lowerBound(0);
      cursorRequest = store.openCursor(keyRange);
      cursorRequest.onsuccess = function(e) {
        /* called when the cursor request succeeds
        */
        var result;
        result = e.target.result;
        if (!(result != null)) return;
        /* pass the result to the caller's callback
        */
        callback(result.value.data);
        return result["continue"]();
      };
      tx.oncomplete = function() {
        /* called when the transaction ends
        */        return console.log('Transaction complete.');
      };
      /* close the connection to the DB
      */
      return db.close();
    };
  };

  window.db.store = function(graph) {
    var request;
    request = indexedDB.open('graph_immutables', 2);
    return request.onsuccess = function() {
      /* called when the connection with the DB is opened successfully
      */
      var db, store, tx;
      db = request.result;
      console.log('Database connection opened.');
      /* open a transaction
      */
      tx = db.transaction('graph', 'readwrite');
      store = tx.objectStore('graph');
      /* store the given graph
      */
      store.put({
        id: 0,
        data: graph
      });
      tx.oncomplete = function() {
        /* called when the transaction ends
        */        return console.log('Transaction complete.');
      };
      /* close the connection to the DB
      */
      return db.close();
    };
  };

}).call(this);