From 81efbd3a866fe3f99768b03c341b7b9d11dda9de Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Tue, 4 Jul 2023 22:28:50 +0100
Subject: Add time monster

---
 src/game.c     | 16 +++++++++++
 src/player.c   | 10 +++++++
 src/player.h   |  3 ++
 src/tmonster.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/tmonster.h |  8 ++++++
 5 files changed, 123 insertions(+)
 create mode 100644 src/tmonster.c
 create mode 100644 src/tmonster.h

diff --git a/src/game.c b/src/game.c
index a89ff66..dc51a21 100644
--- a/src/game.c
+++ b/src/game.c
@@ -10,6 +10,7 @@
 #include "timer.h"
 #include "entities.h"
 
+#include "tmonster.h"
 #include "player.h"
 
 #include "game.h"
@@ -42,6 +43,7 @@ static uint8_t time;
 static uint8_t pickaxe;
 static uint8_t gameover;
 static uint8_t pause;
+static Entity *tmonster;
 
 static void hud_render()
 {
@@ -126,6 +128,7 @@ void run_game()
     stage = 0;
     pickaxe = 0;
     time = GAME_TIME_MAX;
+    tmonster = NULL;
 
     hud = HUD_ALL;
 
@@ -189,6 +192,19 @@ void run_game()
         player_update();
         entities_update();
 
+        /* time monster */
+        if (!time && !tmonster)
+        {
+            tmonster = entities_new();
+            if (tmonster)
+                tmonster_init(tmonster);
+        }
+        if (time && tmonster)
+        {
+            tmonster->used = 0;
+            tmonster = NULL;
+        }
+
         entities_draw();
         player_draw();
 
diff --git a/src/player.c b/src/player.c
index c07cc34..49c032c 100644
--- a/src/player.c
+++ b/src/player.c
@@ -335,3 +335,13 @@ void player_hit()
         sound_queue_efx(EFX_DEATH);
     }
 }
+
+uint16_t player_x()
+{
+    return x;
+}
+
+uint16_t player_y()
+{
+    return y;
+}
diff --git a/src/player.h b/src/player.h
index 4d32881..d0acc93 100644
--- a/src/player.h
+++ b/src/player.h
@@ -11,4 +11,7 @@ uint8_t player_collision(Entity *e);
 uint8_t player_collision_pickup(Entity *e);
 void player_hit();
 
+uint16_t player_x();
+uint16_t player_y();
+
 #endif /* _PLAYER_H */
diff --git a/src/tmonster.c b/src/tmonster.c
new file mode 100644
index 0000000..30d5714
--- /dev/null
+++ b/src/tmonster.c
@@ -0,0 +1,86 @@
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "vga.h"
+#include "map.h"
+#include "entities.h"
+#include "game.h"
+
+#include "player.h"
+
+#include "tmonster.h"
+
+#define WAIT 120
+#define MOVE_TIME 90
+
+static const Rect frames[2 * 4] =
+{
+    /* right */
+    { 96, 16, 144, 144 },
+    { 80, 48, 144, 144 },
+
+    /* not used */
+    { 0, 0, 144, 144 },
+    { 0, 0, 144, 144 },
+
+    /* left */
+    { 96, 16, 144, 144 },
+    { 96, 48, 144, 144 },
+
+    /* not used */
+    { 0, 0, 144, 144 },
+    { 0, 0, 144, 144 }
+};
+
+void tmonster_init(Entity *e)
+{
+    e->y = 16;
+    e->x = 32 + (rand() % 256);
+    e->dir = e->x > 160 ? DIR_LEFT : DIR_RIGHT;
+    e->frames = (const Rect *)frames;
+    e->update = tmonster_wait_update;
+}
+
+void tmonster_wait_update(Entity *e)
+{
+    e->delay++;
+    e->frame = (e->delay & 2) ? 1 : 0;
+
+    if (e->delay == WAIT)
+    {
+        e->delay = 0;
+        e->frame = 1;
+        e->update = tmonster_update;
+    }
+}
+
+void tmonster_update(Entity *e)
+{
+    e->delay++;
+    if (e->delay == WAIT * 2)
+        e->delay = 0;
+
+    if (e->delay < MOVE_TIME)
+    {
+        if (e->x > player_x() && e->x > 0)
+        {
+            e->dir = DIR_LEFT;
+            e->x--;
+        }
+        if (e->x < player_x() && e->x < (MAP_W * MAP_TILE_W) - 16)
+        {
+            e->dir = DIR_RIGHT;
+            e->x++;
+        }
+        if (e->y > player_y() && e->y > 0)
+            e->y--;
+        if (e->y < player_y() && e->y < (MAP_H * MAP_TILE_H) - 16)
+            e->y++;
+    }
+
+    if (player_collision(e))
+    {
+        player_hit();
+        reset_time();
+    }
+}
diff --git a/src/tmonster.h b/src/tmonster.h
new file mode 100644
index 0000000..5d73ad2
--- /dev/null
+++ b/src/tmonster.h
@@ -0,0 +1,8 @@
+#ifndef _TMONSTER_H
+#define _TMONSTER_H
+
+void tmonster_init(Entity *e);
+void tmonster_wait_update(Entity *e);
+void tmonster_update(Entity *e);
+
+#endif /* _TMONSTER_H */
-- 
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