Solved day 6 part 1

Author: Gentleman1983

README.md

@@ -24,7 +24,7 @@ To run all solutions, simply run `./gradlew run`. If you want to run the solutio
 | 3       | ⭐       | ⭐       |
 | 4       | ⭐       | ⭐       |
 | 5       | ⭐       | ⭐       |
-| 6       | ❌       | ❌       |
+| 6       | ⭐       | ❌       |
 | 7       | ❌       | ❌       |
 | 8       | ❌       | ❌       |
 | 9       | ❌       | ❌       |
@@ -44,6 +44,6 @@ To run all solutions, simply run `./gradlew run`. If you want to run the solutio
 | 23      | ❌       | ❌       |
 | 24      | ❌       | ❌       |
 | 25      | ❌       | ❌       |
-| **SUM** | **5 ⭐** | **5 ⭐** |
+| **SUM** | **6 ⭐** | **5 ⭐** |
 
-Total: 10 ⭐
+Total: 11 ⭐

build.gradle

@@ -4,7 +4,7 @@ plugins {
 
 // project meta data
 group 'de.havox_design.aoc2015'
-version '0.5.2'
+version '0.5.3'
 
 // Switch to gradle "all" distribution.
 wrapper {

day06/src/main/java/de/havox_design/aoc2015/day06/HouseDecoratingContest.java

@@ -5,7 +5,13 @@
 import java.util.List;
 
 public class HouseDecoratingContest {
+    private static final int FROM_X = 0;
+    private static final int FROM_Y = 1;
+    private static final int TO_X = 2;
+    private static final int TO_Y = 3;
+
     private final List<String> input;
+    private final boolean[][] houseDecoration = new boolean[1000][1000];
 
     public HouseDecoratingContest(String fileName) {
         input = readData(fileName);
@@ -22,13 +28,99 @@ public static int solvePart2(String fileName) {
     }
 
     public int solvePart1() {
-        return 0;
+        for(String instruction : input) {
+            if(instruction.startsWith("turn on")) {
+                int[] values = parseInstruction(instruction,8);
+                turnOnLight(values[FROM_X], values[TO_X], values[FROM_Y], values[TO_Y]);
+
+            } else if (instruction.startsWith("turn off")) {
+                int[] values = parseInstruction(instruction,9);
+                turnOffLight(values[FROM_X], values[TO_X], values[FROM_Y], values[TO_Y]);
+
+            } else if (instruction.startsWith("toggle")) {
+                int[] values = parseInstruction(instruction,7);
+                toggleLight(values[FROM_X], values[TO_X], values[FROM_Y], values[TO_Y]);
+            } else {
+                throw new IllegalArgumentException("no valid instruction: " + instruction );
+            }
+        }
+
+        return countNumberOfLitLights();
     }
 
     public int solvePart2() {
         return 0;
     }
 
+    private int countNumberOfLitLights() {
+        int numberOfLightsLit = 0;
+
+        for(int x = 0; x < 1000; x++) {
+            for(int y = 0; y < 1000; y++) {
+                if(houseDecoration[x][y]) {
+                    numberOfLightsLit++;
+                }
+            }
+        }
+
+        return numberOfLightsLit;
+    }
+
+    private int[] parseInstruction(String instruction, int offset) {
+        int[] values = new int[4];
+        String data = instruction.substring(offset);
+        String[] words = data.split(" ");
+        String[] fromWords = words[0].split(",");
+        String[] toWords = words[2].split(",");
+
+        values[FROM_X] = Integer.parseInt(fromWords[0]);
+        values[FROM_Y] = Integer.parseInt(fromWords[1]);
+        values[TO_X] = Integer.parseInt(toWords[0]);
+        values[TO_Y] = Integer.parseInt(toWords[1]);
+
+        return values;
+    }
+
+    private void turnOnLight(int x, int y) {
+        setLight(x, y, true);
+    }
+
+    private void turnOnLight(int fromX, int toX, int fromY, int toY) {
+        setLight(fromX, toX, fromY, toY, true);
+    }
+
+    private void turnOffLight(int x, int y) {
+        setLight(x, y, false);
+    }
+
+    private void turnOffLight(int fromX, int toX, int fromY, int toY) {
+        setLight(fromX, toX, fromY, toY, false);
+    }
+
+    private void toggleLight(int x, int y) {
+        setLight(x, y, !houseDecoration[x][y]);
+    }
+
+    private void toggleLight(int fromX, int toX, int fromY, int toY) {
+        for(int x = fromX; x <= toX; x++) {
+            for(int y = fromY; y <= toY; y++) {
+                toggleLight(x, y);
+            }
+        }
+    }
+
+    private void setLight(int x, int y, boolean value) {
+        houseDecoration[x][y] = value;
+    }
+
+    private void setLight(int fromX, int toX, int fromY, int toY, boolean value) {
+        for(int x = fromX; x <= toX; x++) {
+            for(int y = fromY; y <= toY; y++) {
+                setLight(x, y, value);
+            }
+        }
+    }
+
     private List<String> readData(String fileName) {
         return DataReader.readData(fileName, MainClass.class);
     }

day06/src/main/java/de/havox_design/aoc2015/day06/MainClass.java

@@ -7,6 +7,6 @@ public class MainClass {
 
     public static void main(String[] args) {
         LOGGER.info(() -> "Solution 1: " + HouseDecoratingContest.solvePart1("day06.txt"));
-        LOGGER.info(() -> "Solution 2: " + HouseDecoratingContest.solvePart1("day06.txt"));
+        LOGGER.info(() -> "Solution 2: " + HouseDecoratingContest.solvePart2("day06.txt"));
     }
 }