From 02b34678ad72a97a8b9045e1fb507925327cb74a Mon Sep 17 00:00:00 2001
From: Alex Dolgopolova <kladmoy04@mail.ru>
Date: Fri, 13 Feb 2026 15:42:51 +0300
Subject: [PATCH 1/3] Completed task hw1

---
 .idea/.name                               |   1 +
 .idea/codeStyles/Project.xml              | 123 ++++++++++++++++++++++
 .idea/codeStyles/codeStyleConfig.xml      |   5 +
 .idea/gradle.xml                          |   1 +
 .idea/markdown.xml                        |   8 ++
 .idea/misc.xml                            |   1 -
 src/main/kotlin/orders/Order.kt           |  10 +-
 src/main/kotlin/orders/OrderExtensions.kt |  14 ++-
 src/main/kotlin/orders/OrderProcessor.kt  |   6 +-
 9 files changed, 165 insertions(+), 4 deletions(-)
 create mode 100644 .idea/.name
 create mode 100644 .idea/codeStyles/Project.xml
 create mode 100644 .idea/codeStyles/codeStyleConfig.xml
 create mode 100644 .idea/markdown.xml

diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..c9afd04
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+KotlinHomework
\ No newline at end of file
diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
new file mode 100644
index 0000000..7643783
--- /dev/null
+++ b/.idea/codeStyles/Project.xml
@@ -0,0 +1,123 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <JetCodeStyleSettings>
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </JetCodeStyleSettings>
+    <codeStyleSettings language="XML">
+      <option name="FORCE_REARRANGE_MODE" value="1" />
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+    <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </codeStyleSettings>
+  </code_scheme>
+</component>
\ No newline at end of file
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 0000000..79ee123
--- /dev/null
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 589fc7f..444059e 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
diff --git a/.idea/markdown.xml b/.idea/markdown.xml
new file mode 100644
index 0000000..c61ea33
--- /dev/null
+++ b/.idea/markdown.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <option name="previewPanelProviderInfo">
+      <ProviderInfo name="Compose (experimental)" className="com.intellij.markdown.compose.preview.ComposePanelProvider" />
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 74dd639..b2c751a 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
diff --git a/src/main/kotlin/orders/Order.kt b/src/main/kotlin/orders/Order.kt
index 8a6c82a..decb062 100644
--- a/src/main/kotlin/orders/Order.kt
+++ b/src/main/kotlin/orders/Order.kt
@@ -18,6 +18,7 @@ class Order(
      */
     fun addProduct(product: Product?) {
         // TODO: add product to _products, ignore null
+        product?.let {_products.add(it)}
     }
 
     /**
@@ -25,6 +26,7 @@ class Order(
      */
     fun removeProductById(productId: Int) {
         // TODO: remove product from _products by id
+        val product = _products.find {it.id == productId}
     }
 
     /**
@@ -32,7 +34,7 @@ class Order(
      */
     override fun calculateTotal(): Int {
         // TODO: sum the prices of all products
-        return 0
+        return _products.sumOf { it.price }
     }
 
     /**
@@ -41,6 +43,10 @@ class Order(
      */
     fun pay() {
         // TODO: throw if _products is empty, otherwise set status to Paid
+        if (_products.isEmpty()) {
+            throw IllegalStateException("Order is empty")
+        }
+        status = OrderStatus.Paid
     }
 
     /**
@@ -49,5 +55,7 @@ class Order(
      */
     fun cancel(reason: String?) {
         // TODO: set status to Cancelled with reason (default "Unknown reason" if null)
+        val cancel_reason = reason ?: "Unknown reason"
+        status = OrderStatus.Cancelled(cancel_reason)
     }
 }
diff --git a/src/main/kotlin/orders/OrderExtensions.kt b/src/main/kotlin/orders/OrderExtensions.kt
index d644b59..8eeca41 100644
--- a/src/main/kotlin/orders/OrderExtensions.kt
+++ b/src/main/kotlin/orders/OrderExtensions.kt
@@ -12,7 +12,19 @@ package orders
  */
 fun Order.applyDiscount(
     discountPercent: Int,
-    logger: ((String) -> Unit)? = null
+    logger: ((String) -> Unit)? = null //необязательный параметр
 ) {
     // TODO: apply discount to each product using extension + scoped functions
+    val allProducts = products.toList()
+
+    allProducts.forEach { product ->
+        val apdatedPrice = product.price * (100-discountPercent)/100
+
+        val apdatedProduct = product.copy(price = apdatedPrice)
+
+        removeProductById(product.id)
+        addProduct(apdatedProduct)
+
+        logger?.invoke("Product ${product.name} discounted from ${product.price} to ${apdatedPrice}")
+    }
 }
diff --git a/src/main/kotlin/orders/OrderProcessor.kt b/src/main/kotlin/orders/OrderProcessor.kt
index b2bd34d..e55a52c 100644
--- a/src/main/kotlin/orders/OrderProcessor.kt
+++ b/src/main/kotlin/orders/OrderProcessor.kt
@@ -9,5 +9,9 @@ package orders
  */
 fun processOrder(order: Order): String {
     // TODO: use when to return the appropriate string
-    return ""
+    return when(val order_status = order.status) {
+        is OrderStatus.Created -> "Order ${order.id} is new"
+        is OrderStatus.Paid -> "Order ${order.id} is paid"
+        is OrderStatus.Cancelled -> "Order ${order.id} is cancelled: ${order_status.reason}"
+    }
 }

From 062af8304362764f5a32893b06f33ad01727e45c Mon Sep 17 00:00:00 2001
From: Alex Dolgopolova <kladmoy04@mail.ru>
Date: Fri, 13 Feb 2026 15:43:50 +0300
Subject: [PATCH 2/3] Completed task hw1

---
 src/main/kotlin/orders/OrderProcessor.kt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main/kotlin/orders/OrderProcessor.kt b/src/main/kotlin/orders/OrderProcessor.kt
index e55a52c..528d33e 100644
--- a/src/main/kotlin/orders/OrderProcessor.kt
+++ b/src/main/kotlin/orders/OrderProcessor.kt
@@ -11,6 +11,7 @@ fun processOrder(order: Order): String {
     // TODO: use when to return the appropriate string
     return when(val order_status = order.status) {
         is OrderStatus.Created -> "Order ${order.id} is new"
+
         is OrderStatus.Paid -> "Order ${order.id} is paid"
         is OrderStatus.Cancelled -> "Order ${order.id} is cancelled: ${order_status.reason}"
     }

From 1cd05035a63fb20ff37b66c5ed0a9593c25effaf Mon Sep 17 00:00:00 2001
From: Alex Dolgopolova <kladmoy04@mail.ru>
Date: Fri, 13 Feb 2026 15:52:49 +0300
Subject: [PATCH 3/3] fixed removeProductById in Order

---
 .idea/gradle.xml                | 2 +-
 gradle.properties               | 1 +
 src/main/kotlin/orders/Order.kt | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 444059e..5cd5d8f 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -6,7 +6,7 @@
       <GradleProjectSettings>
         <option name="testRunner" value="CHOOSE_PER_TEST" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
+        <option name="gradleJvm" value="jbr-21" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/gradle.properties b/gradle.properties
index 2ddb726..8a03ce0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,2 +1,3 @@
 org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 kotlin.code.style=official
+org.gradle.java.home=/home/karassad/android-studio/android-studio/jbr
\ No newline at end of file
diff --git a/src/main/kotlin/orders/Order.kt b/src/main/kotlin/orders/Order.kt
index decb062..bbee590 100644
--- a/src/main/kotlin/orders/Order.kt
+++ b/src/main/kotlin/orders/Order.kt
@@ -27,6 +27,7 @@ class Order(
     fun removeProductById(productId: Int) {
         // TODO: remove product from _products by id
         val product = _products.find {it.id == productId}
+        product?.let { _products.remove(it) }
     }
 
     /**