added ranger sean

assets/yarn/himiko.yarn

@@ -26,7 +26,7 @@ Himiko: Remember if you get any wrong, you get a fine from the city!
 Himiko: Here is a bigger bag for you to hold more rubbish.
 Himiko: Let's go clean up Gomiland! Here is a map for you if you are lost
 Himiko: Oh and don't forget to stop and talk to people. Some need help!
-<<increaseBagSize 10>>
+<<increaseBagSize>>
 <<changeState "level_2">>
 ===
 title: level_1_incorrect

assets/yarn/ranger.yarn

@@ -0,0 +1,25 @@
+<<character "Ranger Sean" Ranger>>
+title: buy_bag
+---
+Ranger: Hello adventurer! I'm Ranger Sean, Gomiland National Park's Chief Park Ranger.
+Ranger: Recently there has been a bit of rubbish that park goers leave behind.
+Ranger: Could you help make the park a cleaner place? I can sell you a big bag that you can hold more trash in!
+Ranger: I costs 500 coins for the bag. Do you want it?
+-> No
+    Ranger: No problem. The one you have works fine!
+    Ranger: But if you want to pick up more, come buy the bag from me next time.
+-> Yes
+    <<if $coins < 500>>
+        Ranger: Looks like you don't have enough coins. Come back when you do!
+    <<else>>
+        <<upgradeBag>>
+        Ranger: Here you go! A bag that can hold 30 pieces of trash.
+        Ranger: You can give your old one to Himiko. She will hand them out to people who don't have one.
+    <<endif>>
+===
+title: greeting
+---
+Ranger: Hello again adventurer! Gomiland National Park offers a great variety of attractions.
+Ranger: Visit the Bamboo Forest and shrine, Park Castle or World Forest!
+Ranger: There is never ending places to explore. Remember to pick up the trash along the way!
+===

lib/constants/constants.dart

@@ -35,6 +35,9 @@ const int playerFastSpeed = 6;
 const double npcSpeed = 2;
 const double maxRaycastDist = 40;
 const int maxCoinAmount = 999999;
+const int smallBagSize = 10;
+const int mediumBagSize = 30;
+const int largeBagSize = 50;
 
 // day cycle
 const gameMinToRealSecond = 0.1;

lib/game/npcs/himiko.dart

@@ -125,8 +125,8 @@ class Himiko extends Npc with HasGameReference<GomilandGame> {
         game.dialogueControllerComponent;
     YarnProject yarnProject = YarnProject();
     yarnProject
+      ..commands.addCommand0('increaseBagSize', increaseBagSize)
       ..commands.addCommand1('changeState', changeState)
-      ..commands.addCommand1('increaseBagSize', increaseBagSize)
       ..variables.setVariable('\$dayOfWeek', getDayOfWeek())
       ..parse(await rootBundle.loadString(Assets.assets_yarn_himiko_yarn));
     DialogueRunner dialogueRunner = DialogueRunner(
@@ -149,8 +149,8 @@ class Himiko extends Npc with HasGameReference<GomilandGame> {
     game.progressStateBloc.add(SetNeighbourState(newState));
   }
 
-  void increaseBagSize(int newSize) {
-    game.gameStateBloc.add(SetBagSize(newSize));
+  void increaseBagSize() {
+    game.gameStateBloc.add(const SetBagSize(smallBagSize));
   }
 
   String getDialogueName() {

lib/game/npcs/ranger.dart

@@ -0,0 +1,91 @@
+import 'package:flame/collisions.dart';
+import 'package:flame/components.dart';
+import 'package:flame/flame.dart';
+import 'package:flame/sprite.dart';
+import 'package:flutter/services.dart';
+import 'package:gomiland/assets.dart';
+import 'package:gomiland/constants/constants.dart';
+import 'package:gomiland/controllers/game_state/game_state_bloc.dart';
+import 'package:gomiland/game/game.dart';
+import 'package:gomiland/game/npcs/npc.dart';
+import 'package:gomiland/game/npcs/utils.dart';
+import 'package:gomiland/game/ui/dialogue/dialogue_controller_component.dart';
+import 'package:gomiland/utils/directions.dart';
+import 'package:jenny/jenny.dart';
+
+class Ranger extends Npc with HasGameReference<GomilandGame> {
+  Ranger({required super.position});
+
+  late SpriteAnimation idleUp;
+  late SpriteAnimation idleDown;
+  late SpriteAnimation idleLeft;
+  late SpriteAnimation idleRight;
+
+  @override
+  void onLoad() async {
+    final image = await Flame.images.load(Assets.assets_images_npcs_ranger_png);
+    final spriteSheet = SpriteSheet(
+      image: image,
+      srcSize: Vector2.all(tileSize),
+    );
+
+    idleUp =
+        spriteSheet.createAnimation(row: 1, stepTime: stepTime, from: 0, to: 1);
+    idleDown =
+        spriteSheet.createAnimation(row: 0, stepTime: stepTime, from: 0, to: 1);
+    idleLeft =
+        spriteSheet.createAnimation(row: 3, stepTime: stepTime, from: 0, to: 1);
+    idleRight =
+        spriteSheet.createAnimation(row: 2, stepTime: stepTime, from: 0, to: 1);
+
+    animation = idleDown;
+    addAll([npcObstacle(Vector2.zero()), RectangleHitbox()]);
+  }
+
+  void _facePlayer(Vector2 playerPosition) {
+    Direction direction =
+        getDirection(getPlayerAngle(playerPosition, position));
+    switch (direction) {
+      case Direction.up:
+        animation = idleUp;
+        break;
+      case Direction.down:
+        animation = idleDown;
+        break;
+      case Direction.left:
+        animation = idleLeft;
+        break;
+      case Direction.right:
+        animation = idleRight;
+        break;
+    }
+  }
+
+  @override
+  Future<void> startConversation(Vector2 playerPosition) async {
+    game.freezePlayer();
+    _facePlayer(playerPosition);
+
+    DialogueControllerComponent dialogueControllerComponent =
+        game.dialogueControllerComponent;
+    YarnProject yarnProject = YarnProject();
+
+    int bagSize = game.gameStateBloc.state.bagSize;
+    yarnProject.strictCharacterNames = false;
+
+    yarnProject
+      ..variables.setVariable('\$coins', game.gameStateBloc.state.coinAmount)
+      ..commands.addCommand0('upgradeBag', upgradeBag)
+      ..parse(await rootBundle.loadString(Assets.assets_yarn_friend_yarn));
+    DialogueRunner dialogueRunner = DialogueRunner(
+        yarnProject: yarnProject, dialogueViews: [dialogueControllerComponent]);
+    await dialogueRunner
+        .startDialogue(bagSize == smallBagSize ? 'buy_bag' : 'greeting');
+    game.unfreezePlayer();
+  }
+
+  void upgradeBag() {
+    game.gameStateBloc.add(const SetBagSize(20));
+    deductCoins(game, 500);
+  }
+}

lib/game/npcs/utils.dart

@@ -96,11 +96,16 @@ String getFriendDialogue(OtherPlayer friendInfo, GomilandGame game) {
     int playerSpeed = game.playerStateBloc.state.playerSpeed;
     int bagSize = game.gameStateBloc.state.bagSize;
     if (playerCompletedMainQuests) {
-      if (playerSpeed > playerBaseSpeed && bagSize > 10) {
+      if (playerSpeed > playerBaseSpeed && bagSize > largeBagSize) {
         return 'seasoned_player';
       } else {
         if (playerSpeed > playerBaseSpeed) {
-          return 'buy_bag';
+          // only allow buying a big bag if player has a medium bag
+          if (bagSize == mediumBagSize) {
+            return 'buy_bag';
+          } else {
+            return 'progress_player';
+          }
         } else if (bagSize > 10) {
           return 'buy_shoe';
         }