First enhancement in the send flow architecture

src/js/services/send-flow-state.service.js

@@ -0,0 +1,99 @@
+'use strict';
+
+(function(){
+
+angular
+  .module('copayApp.services')
+  .factory('sendFlowStateService', sendFlowStateService);
+  
+  function sendFlowStateService() {
+
+    var service = {
+      // A separate state variable so we can ensure it is cleared of everything,
+      // even other properties added that this service does not know about. (such as "coin")
+      state: {
+        amount: '',
+        displayAddress: null,
+        fromWalletId: '',
+        sendMax: false,
+        thirdParty: null,
+        toAddress: '',
+        toWalletId: ''
+      },
+      previousStates: [],
+
+      // Functions
+      init: init,
+      clear: clear,
+      getClone: getClone,
+      map: map,
+      pop: pop,
+      push: push,
+    };
+
+    return service;
+
+    function init(params) {
+      clear();
+      map(params);
+    }
+
+    function clear() {
+      console.log("sendFlow clear()");
+      clearCurrent();
+      service.previousStates = [];
+    }
+
+    function clearCurrent() {
+      console.log("sendFlow clearCurrent()");
+      service.state = {
+        amount: '',
+        displayAddress: null,
+        fromWalletId: '',
+        sendMax: false,
+        thirdParty: null,
+        toAddress: '',
+        toWalletId: ''
+      }
+    }
+
+    /**
+     * Handy for debugging
+     */
+    function getClone() {
+      var currentState = {};
+      Object.keys(service.state).forEach(function forCurrentParam(key) {
+        if (typeof service.state[key] !== 'function' && key !== 'previousStates') {
+          currentState[key] = service.state[key];
+        }
+      });
+      return currentState;
+    }
+
+    function map(params) {
+      Object.keys(params).forEach(function forNewParam(key) {
+        service.state[key] = params[key];
+      });
+    };
+
+    function pop() {
+      console.log('sendFlow pop');
+      if (service.previousStates.length) {
+        var params = service.previousStates.pop();
+        clearCurrent();
+        map(params);
+      } else {
+        clear();
+      }
+    };
+
+    function push(params) {
+      console.log('sendFlow push');
+      var currentParams = getClone();
+      service.previousStates.push(currentParams);
+      clearCurrent();
+      map(params);
+    };
+  };
+
+})();