feat(state): ability to reset state from the web UI

Closes: #68

Author: nergal-perm

src/main/java/ru/ewc/checklogic/LogicChecker.java

@@ -30,6 +30,7 @@
 import ru.ewc.checklogic.server.CommandPage;
 import ru.ewc.checklogic.server.ContextPage;
 import ru.ewc.checklogic.server.Endpoints;
+import ru.ewc.checklogic.server.StatePage;
 import ru.ewc.checklogic.server.config.ConfigPage;
 
 /**
@@ -58,6 +59,7 @@ public static void main(final String[] args) {
         registerEndpoints(web, new CommandPage(context));
         registerEndpoints(web, new ContextPage(context, factory.configuration()));
         registerEndpoints(web, new AllEndpoints(context, factory.configuration()));
+        registerEndpoints(web, new StatePage(context));
         minum.block();
     }
 

src/main/java/ru/ewc/checklogic/server/Endpoints.java

@@ -44,6 +44,11 @@ public interface Endpoints {
      */
     RequestLine.Method POST = RequestLine.Method.POST;
 
+    /**
+     * The shortcut to define an endpoint for a DELETE method.
+     */
+    RequestLine.Method DELETE = RequestLine.Method.DELETE;
+
     /**
      * Content type for CSS files.
      */

src/main/java/ru/ewc/checklogic/server/StatePage.java

@@ -0,0 +1,58 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2024 Decision-Driven Development
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package ru.ewc.checklogic.server;
+
+import com.renomad.minum.web.Request;
+import com.renomad.minum.web.RequestLine;
+import com.renomad.minum.web.Response;
+import com.renomad.minum.web.WebFramework;
+import java.util.Map;
+import ru.ewc.checklogic.ServerInstance;
+
+/**
+ * I am a class providing access to the state page.
+ *
+ * @since 0.4.1
+ */
+public final class StatePage implements Endpoints {
+    /**
+     * The context that stores the current state of the system.
+     */
+    private final ServerInstance context;
+
+    public StatePage(final ServerInstance context) {
+        this.context = context;
+    }
+
+    @Override
+    public void register(final WebFramework web) {
+        web.registerPath(RequestLine.Method.DELETE, "state", this::resetState);
+    }
+
+    private Response resetState(final Request request) {
+        assert request.requestLine().getMethod().equals(RequestLine.Method.DELETE);
+        this.context.initialize();
+        return Response.htmlOk("OK", Map.of("HX-Redirect", "/state"));
+    }
+}

src/main/resources/templates/state.html

@@ -24,11 +24,19 @@
 <div class="row">
     <div class="col">
         <h1>State entities</h1>
-        {{ state }}
+        <div class="row">
+            <div class="col col-4">
+                <button class="btn btn-primary" hx-delete="/state" hx-trigger="click">Reset</button>
+            </div>
+        </div>
+        <div class="row">
+            {{ state }}
+        </div>
     </div>
     <div class="col">
         <h1>Context</h1>
-        <form class="mb-3" hx-post="/context" hx-target="#commands" hx-swap="innerHTML" hx-trigger="submit, load">
+        <form class="mb-3" hx-post="/context" hx-target="#commands" hx-swap="innerHTML"
+              hx-trigger="submit, load">
             <div class="mb-3">
                 <label class="col-form-label" for="reqValues">Request values:</label>
                 <textarea class="form-control" id="reqValues" name="reqValues" rows="3"