small update

boss prototype, auto planter, visual reworks, bug fixes

engine/bosses.py

@@ -0,0 +1,83 @@
+from __future__ import annotations
+
+from .plants import HP_MULT
+from .skills import Skill, TARGET_ENEMY
+from .types import TYPE_GARDEN
+from .unit import TEAM_ENEMY, Unit
+
+# A boss appears every BOSS_FLOOR_STEP floors (20, 40, 60, ...). Bosses are
+# fought alone (1 vs the player's team) and have far bigger stats than normal
+# floor enemies.
+BOSS_FLOOR_STEP = 20
+
+# Chance (0..1) a defeated boss drops one of its signature runes — much higher
+# than the ~5-15% rune drop chance anywhere else.
+BOSS_RUNE_DROP_CHANCE = 0.80
+
+BOSS_SPECS = {
+    "Stones": {
+        "type": TYPE_GARDEN,
+        # (attack, speed, defense, health) — medium attack, very low speed,
+        # medium defense, high health (before HP_MULT).
+        "stats": (110, 30, 90, 380),
+        "sprite": "stones",
+        "drop_runes": ("ruby", "amethyst"),
+        "desc": "A slow, rocky guardian. Each Pebble Throw stacks its power "
+                "(up to 3); at 3 stacks it unleashes Landslide for huge damage.",
+    },
+}
+
+
+def is_boss(name: str) -> bool:
+    return name in BOSS_SPECS
+
+
+def boss_for_floor(floor: int):
+    """The boss that appears on `floor`, or None if it's a normal floor."""
+    if floor > 0 and floor % BOSS_FLOOR_STEP == 0:
+        return "Stones"
+    return None
+
+
+def boss_type(name: str) -> str:
+    return BOSS_SPECS[name]["type"]
+
+
+def boss_stats(name: str) -> tuple:
+    return BOSS_SPECS[name]["stats"]
+
+
+def boss_sprite(name: str) -> str:
+    return BOSS_SPECS[name]["sprite"]
+
+
+def boss_drop_runes(name: str) -> tuple:
+    return BOSS_SPECS[name]["drop_runes"]
+
+
+def boss_floor_level(floor: int) -> int:
+    """Display level for a boss at `floor` (scales with each boss appearance)."""
+    return 1 + floor // BOSS_FLOOR_STEP
+
+
+def make_boss(name: str, floor: int) -> Unit:
+    """Build the boss unit for `floor`. Boss stats are already far above normal
+    enemies and grow a little with each appearance so they stay threatening."""
+    spec = BOSS_SPECS[name]
+    atk, spd, dfn, hp = spec["stats"]
+    lvl = boss_floor_level(floor)
+    mult = 1 + 0.06 * (lvl - 1)
+    atk = int(atk * mult)
+    dfn = int(dfn * mult)
+    hp = int(hp * mult)
+    pebble = Skill("Pebble Throw", power=60, target=TARGET_ENEMY, cooldown=0,
+                   mechanic="boss_stack", priority=2,
+                   description="Medium damage; stacks the boss's power (up to 3).")
+    landslide = Skill("Landslide", power=140, target=TARGET_ENEMY, cooldown=0,
+                      mechanic="boss_landslide", priority=1,
+                      description="Huge damage, releases all stacks. Needs 3 stacks.")
+    u = Unit(name, TEAM_ENEMY, spec["type"], max_hp=int(hp * HP_MULT),
+             attack=atk, speed=spd, defense=dfn, skills=[pebble, landslide],
+             role="tank", crit=0.05)
+    u.hp = u.max_hp
+    return u