From 0ef4a323549ea72f4c5c3df17ac78ceda069ed03 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson@vistahigherlearning.com>
Date: Thu, 21 Oct 2021 08:28:40 -0400
Subject: Add real boss fight.

---
 bonnie-bee/boss.scm | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 60 insertions(+), 3 deletions(-)

(limited to 'bonnie-bee/boss.scm')

diff --git a/bonnie-bee/boss.scm b/bonnie-bee/boss.scm
index d19f2c2..7e4d375 100644
--- a/bonnie-bee/boss.scm
+++ b/bonnie-bee/boss.scm
@@ -3,6 +3,7 @@
   #:use-module (bonnie-bee assets)
   #:use-module (bonnie-bee bullet)
   #:use-module (chickadee audio)
+  #:use-module (chickadee game-loop)
   #:use-module (chickadee graphics particles)
   #:use-module (chickadee math)
   #:use-module (chickadee math rect)
@@ -15,7 +16,8 @@
   #:use-module (starling node-2d)
   #:export (<boss>))
 
-(define-class <boss> (<grounded> <damageable> <actor>))
+(define-class <boss> (<grounded> <damageable> <actor>)
+  (invincible? #:accessor invincible? #:init-value #t))
 
 (define-method (on-boot (boss <boss>))
   (attach-to boss
@@ -23,14 +25,69 @@
                #:texture beetle-image
                #:origin (vec2 64.0 32.0))))
 
+(define-method (on-enter (boss <boss>))
+  (define (circle-shot n offset speed type)
+    (let loop ((i 0))
+      (when (< i n)
+        (let ((theta (+ (* (/ tau n) i) offset)))
+          (add-bullet (bullets (parent boss))
+                      type
+                      (position boss)
+                      (vec2 (* (cos theta) speed)
+                            (* (sin theta) speed)))
+          (loop (+ i 1))))))
+  (define (random-shot speed)
+    (let ((theta (* (- pi) (random:uniform))))
+      (add-bullet (bullets (parent boss))
+                  medium-enemy-bullet
+                  (position boss)
+                  (vec2 (* (cos theta) speed)
+                        (* (sin theta) speed)))))
+  (next-method)
+  (run-script boss
+    (sleep 5.0)
+    (set! (invincible? boss) #f)
+    (let ((big-speed 2.0)
+          (little-speed 1.0))
+      (while (> (health boss) 2000)
+        (let ((d (direction-to boss (player (parent boss)))))
+          (add-bullet (bullets (parent boss))
+                      large-enemy-bullet
+                      (position boss)
+                      (vec2* d big-speed))
+          (let loop ((i 0))
+            (when (< i 16)
+              (audio-play (asset-ref enemy-shoot-sound))
+              (random-shot little-speed)
+              (sleep (* (current-timestep) 2.0))
+              (loop (+ i 1)))))))
+    (sleep 2.5)
+    (let loop ((theta 0.0))
+      (unless (<= (health boss) 1000)
+        (audio-play (asset-ref enemy-shoot-sound))
+        (repeat 2 (random-shot 0.5))
+        (circle-shot 2 theta 1.5 large-enemy-bullet)
+        (circle-shot 6 (- theta) 1.0 medium-enemy-bullet)
+        (sleep (* (current-timestep) 10))
+        (loop (+ theta (/ pi 17.1)))))
+    (sleep 2.5)
+    (let loop ((theta 0.0))
+      (audio-play (asset-ref enemy-shoot-sound))
+      (circle-shot 10 (* theta 2.0) 1.5 large-enemy-bullet)
+      (circle-shot 4 (- theta) 1.0 medium-enemy-bullet)
+      (sleep (* (current-timestep) 10))
+      (loop (+ theta (/ pi 37.1))))))
+
 (define-method (on-collide (boss <boss>) (bullet <bullet>))
   (cond
    ((player-primary-bullet? bullet)
-    (damage boss 1)
+    (unless (invincible? boss)
+      (damage boss 1))
     (kill-bullet bullet)
     #t)
    ((player-bomb-bullet? bullet)
-    (damage boss 10)
+    (unless (invincible? boss)
+      (damage boss 10))
     (kill-bullet bullet))
    (else #f)))
 
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