Merge branch 'master' into 106-ug-ped

# Conflicts:
#	docs/DeveloperGuide.md

docs/DeveloperGuide.md

@@ -45,6 +45,8 @@ The bulk of the app's work is done by the following four components:
 * [**`Logic`**](#logic-component): The command executor.
 * [**`Model`**](#model-component): Holds the data of the App in memory.
 * [**`Storage`**](#storage-component): Reads data from, and writes data to, the hard disk.
+* [**`History`**](#storage-component): Holds states of the model.
+* [**`State`**](#storage-component): Has data on the state of the model at a specific time point.
 
 [**`Commons`**](#common-classes) represents a collection of classes used by multiple other components.
 
@@ -67,7 +69,7 @@ The sections below give more details of each component.
 
 ### UI component
 
-The **API** of this component is specified in [`Ui.java`](https://github.com/se-edu/addressbook-level3/tree/master/src/main/java/seedu/address/ui/Ui.java)
+The **API** of this component is specified in [`Ui.java`](https://github.com/AY2324S2-CS2103T-W12-4/tp/blob/master/src/main/java/seedu/address/ui/Ui.java)
 
 <puml src="diagrams/UiClassDiagram.puml" alt="Structure of the UI Component"/>
 
@@ -84,7 +86,7 @@ The `UI` component,
 
 ### Logic component
 
-**API** : [`Logic.java`](https://github.com/se-edu/addressbook-level3/tree/master/src/main/java/seedu/address/logic/Logic.java)
+**API** : [`Logic.java`](https://github.com/AY2324S2-CS2103T-W12-4/tp/blob/master/src/main/java/seedu/address/logic/Logic.java)
 
 Here's a (partial) class diagram of the `Logic` component:
 
@@ -116,7 +118,7 @@ How the parsing works:
 * All `XYZCommandParser` classes (e.g., `AddCommandParser`, `DeleteCommandParser`, ...) inherit from the `Parser` interface so that they can be treated similarly where possible e.g, during testing.
 
 ### Model component
-**API** : [`Model.java`](https://github.com/se-edu/addressbook-level3/tree/master/src/main/java/seedu/address/model/Model.java)
+**API** : [`Model.java`](https://github.com/AY2324S2-CS2103T-W12-4/tp/blob/master/src/main/java/seedu/address/model/Model.java)
 
 <puml src="diagrams/ModelClassDiagram.puml" width="450" />
 
@@ -139,7 +141,7 @@ The `Model` component,
 
 ### Storage component
 
-**API** : [`Storage.java`](https://github.com/se-edu/addressbook-level3/tree/master/src/main/java/seedu/address/storage/Storage.java)
+**API** : [`Storage.java`](https://github.com/AY2324S2-CS2103T-W12-4/tp/blob/master/src/main/java/seedu/address/storage/Storage.java)
 
 <puml src="diagrams/StorageClassDiagram.puml" width="550" />
 
@@ -148,6 +150,30 @@ The `Storage` component,
 * inherits from both `AddressBookStorage` and `UserPrefStorage`, which means it can be treated as either one (if only the functionality of only one is needed).
 * depends on some classes in the `Model` component (because the `Storage` component's job is to save/retrieve objects that belong to the `Model`)
 
+### History component
+
+**API** : [`History.java`](https://github.com/AY2324S2-CS2103T-W12-4/tp/blob/master/src/main/java/seedu/address/history/History.java)
+
+<puml src="diagrams/HistoryClassDiagram.puml" width="350" />
+
+The `History` component,
+* Stores the states of the model or commands entered at different time points.
+* depends on some classes in the `Model` component (because the `History` component's job is to save/retrieve objects that belong to the `Model`)
+
+### State component
+
+**API** : [`ModelState.java`](https://github.com/se-edu/addressbook-level3/tree/master/src/main/java/seedu/address/history/ModelState.java), [`CommandState.java`](https://github.com/se-edu/addressbook-level3/tree/master/src/main/java/seedu/address/history/CommandState.java) 
+
+<puml src="diagrams/ModelStateClassDiagram.puml" width="550" />
+<puml src="diagrams/CommandStateClassDiagram.puml" width="150" />
+
+The `ModelState` component,
+* Stores a single state of the model at a specific time point.
+* depends on some classes in the `Model` component (because the `State` component's job is to save/retrieve objects that belong to the `Model`)
+
+The `CommandState` component,
+* Stores a single state of the command entered at a specific time point.
+
 ### Common classes
 
 Classes used by multiple components are in the `seedu.addressbook.commons` package.
@@ -403,6 +429,41 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli
 
       Use case ends.
 
+
+#### Use case: Schedule an event
+
+**MSS**
+
+1.  User requests to schedule an event
+2.  ConnectCare schedules the event
+
+    Use case ends.
+
+**Extensions**
+
+* 1a. The details of the event are incorrect
+
+    * 1a1. ConnectCare shows an error message.
+
+      Use case ends.
+
+#### Use case: Delete an event
+
+**MSS**
+
+1.  User requests to delete an event
+2.  ConnectCare deletes the event
+
+    Use case ends.
+
+**Extensions**
+
+* 1a. The details of the event are incorrect
+
+    * 1a1. ConnectCare shows an error message.
+
+      Use case ends.
+
 #### Use case: Exit the application
 
 **MSS**
@@ -492,6 +553,8 @@ testers are expected to do more *exploratory* testing.
 
 ### Planned Enhancements
 
+Team size: 5
+
 1. Currently, names must be unique and must only contain alphanumeric characters. This means different languages and special characters are not allowed, and we are planning to include these in the future.
 
 2. There is currently no method for new user to clear or find schedules quickly. We are planning to add these commands and expand the capability of this feature in the future.