More work on combat

evennia/contrib/tutorials/evadventure/characters.py

@@ -8,6 +8,7 @@ from evennia.objects.objects import DefaultCharacter, DefaultObject
 from evennia.typeclasses.attributes import AttributeProperty
 from evennia.utils.utils import lazy_property, int2str
 from .objects import EvAdventureObject
+from . import rules
 
 
 class EquipmentError(TypeError):
@@ -284,6 +285,7 @@ class EvAdventureCharacter(DefaultCharacter):
 
     """
 
+    # these are the ability bonuses. Defense is always 10 higher
     strength = AttributeProperty(default=1)
     dexterity = AttributeProperty(default=1)
     constitution = AttributeProperty(default=1)
@@ -308,6 +310,24 @@ class EvAdventureCharacter(DefaultCharacter):
         """Allows to access equipment like char.equipment.worn"""
         return EquipmentHandler(self)
 
+    @property
+    def weapon(self):
+        """
+        Quick access to the character's currently wielded weapon.
+        Will return the "Unarmed" weapon if none other are found.
+
+        """
+        # TODO
+
+    @property
+    def armor(self):
+        """
+        Quick access to the character's current armor.
+        Will return the "Unarmored" armor if none other are found.
+
+        """
+        # TODO
+
     def at_pre_object_receive(self, moved_object, source_location, **kwargs):
         """
         Hook called by Evennia before moving an object here. Return False to abort move.
@@ -358,6 +378,37 @@ class EvAdventureCharacter(DefaultCharacter):
         self.equipment.remove(moved_object)
 
 
+    def at_pre_damage(self, dmg, attacker=None):
+        """
+        Called when receiving damage for whatever reason. This
+        is called *before* hp is evaluated for defeat/death.
+
+        """
+    def at_post_damage(self, dmg, attacker=None):
+        """
+        Called when receiving damage for whatever reason. This
+        is called *before* hp is evaluated for defeat/death.
+
+        """
+
+    def defeat_message(self, attacker, dmg):
+        return f"After {attacker.key}'s attack, {self.key} collapses in a heap."
+
+    def at_defeat(self, attacker, dmg):
+        """
+        At this point, character has been defeated but is not killed (their
+        hp >= 0 but they lost ability bonuses). Called after being defeated in combat or
+        other situation where health is lost below or equal to 0.
+
+        """
+
+    def handle_death(self):
+        """
+        Called when character dies.
+
+        """
+
+
 class EvAdventureNPC(DefaultCharacter):
     """
     This is the base class for all non-player entities, including monsters. These

evennia/contrib/tutorials/evadventure/combat_turnbased.py

@@ -19,41 +19,25 @@ from dataclasses import dataclass
 from collections import defaultdict
 from evennia.scripts.scripts import DefaultScript
 from evennia.typeclasses.attributes import AttributeProperty
+from evennia.utils.utils import make_iter
 from . import rules
 
 MIN_RANGE = 0
 MAX_RANGE = 4
 
-@dataclass
-class CombatantStats:
+RANGE_NAMES = {
+    0: "close",  # melee, short weapons, fists. long weapons with disadvantage
+    1: "near",  # melee, long weapons, short weapons with disadvantage
+    2: "medium",  # thrown, ranged with disadvantage
+    3: "far",  # ranged, thrown with disadvantage
+    4: "disengaging"  # no weapons
+}
+
+
+class AttackFailure(RuntimeError):
     """
-    Represents temporary combat-only data we need to track
-    during combat for a single Character.
-
+    Cannot attack for some reason.
     """
-    weapon = None
-    armor = None
-    # abstract distance relationship to other combatants
-    distance_matrix = {}
-    # actions may affect what works better/worse next round
-    advantage_actions_next_turn = []
-    disadvantage_actions_next_turn = []
-
-    def get_distance(self, target):
-        return self.distance_matrix.get(target)
-
-    def change_distance(self, target, change):
-        """
-        Change the distance to an opponent. This is symmetric.
-
-        Args:
-            target (Object): The target to change the distance to.
-            change (int): How to change the distance. Negative values to
-                approach, positive to move away from target.
-        """
-        current_dist = self.distance_matrix.get(target)  # will raise error if None, as it should
-        new_dist = max(MIN_RANGE, min(MAX_RANGE, current_dist + change))
-        self.distance_matrix[target] = target.distance_matrix[self] = new_dist
 
 
 class EvAdventureCombat(DefaultScript):
@@ -62,12 +46,18 @@ class EvAdventureCombat(DefaultScript):
     of all active participants. It's also possible to join (or leave) the fray later.
 
     """
-    combatants = AttributeProperty(default=dict())
-    queue = AttributeProperty(default=list())
+    combatants = AttributeProperty(default=list())
+    action_queue = AttributeProperty(default=dict())
+
     # turn counter - abstract time
-    turn = AttributeProperty(default=1)
-    # symmetric distance matrix
-    distance_matrix = {}
+    turn = AttributeProperty(default=0)
+    # symmetric distance matrix (handled dynamically). Mapping {combatant1: {combatant2: dist}, ...}
+    distance_matrix = defaultdict(dict)
+    # advantages or disadvantages gained against different targets
+    advantage_matrix = AttributeProperty(defaultdict(dict))
+    disadvantage_matrix = AttributeProperty(defaultdict(dict))
+
+    stunt_duration = 2
 
     def _refresh_distance_matrix(self):
         """
@@ -85,55 +75,255 @@ class EvAdventureCombat(DefaultScript):
         4. Disengaging/fleeing (no weapons can be used)
 
         Distance is tracked to each opponent individually. One can move 1 step and attack
-        or up to 3 steps without attacking.
+        or up to 2 steps (closer or further away) without attacking.
 
         New combatants will start at a distance averaged between the optimal ranges
         of them and their opponents.
 
         """
-        handled = []
-        for combatant1, combatant_stats1 in self.combatants.items():
-            for combatant2, combatant_stats2 in self.combatants.items():
+        combatants = self.combatants
+        distance_matrix = self.distance_matrix
+
+        for combatant1 in combatants:
+            for combatant2 in combatants:
 
                 if combatant1 == combatant2:
                     continue
 
-                # only update if data was not available already (or drifted
-                # out of sync, which should not happen)
-                dist1 = combatant_stats1.get_distance(combatant2)
-                dist2 = combatant_stats2.get_distance(combatant1)
-                if None in (dist1, dist2) or dist1 != dist2:
-                    # a new distance-relation - start out at average distance
-                    avg_range = round(0.5 * (combatant1.weapon.range_optimal
-                                             + combatant2.weapon.range_optimal))
-                    combatant_stats1.distance_matrix[combatant2] = avg_range
-                    combatant_stats2.distance_matrix[combatant1] = avg_range
+                combatant1_distances = distance_matrix[combatant1]
+                combatant2_distances = distance_matrix[combatant2]
 
-                handled.append(combatant1)
-                handled.append(combatant2)
+                if combatant2 not in combatant1_distances or combatant1 not in combatant2_distances:
+                    # this happens on initialization or when a new combatant is added.
+                    # we make sure to update both sides to the distance of the longest
+                    # optimal weapon range. So ranged weapons have advantage going in.
+                    start_optimal = max(combatant1.weapon.distance_optimal,
+                                        combatant2.weapon.distance_optimal)
 
-        self.combatants = handled
+                    combatant1_distances[combatant2] = start_optimal
+                    combatant2_distances[combatant1] = start_optimal
 
-    def _move_relative_to(self, combatant, target_combatant, change):
+    def _start_turn(self):
+        """
+        New turn events
+
+        """
+        self.turn += 1
+        self.action_queue = {}
+
+    def _end_turn(self):
+        """
+        End of turn cleanup.
+
+        """
+        # refresh stunt timeouts
+        oldest_stunt_age = self.turn - self.stunt_duration
+
+        advantage_matrix = self.advantage_matrix
+        disadvantage_matrix = self.disadvantage_matrix
+
+        # to avoid modifying the dict while we iterate over it, we
+        # put the results in new dicts. This also avoids us having to
+        # delete from the old dicts.
+        new_advantage_matrix = {}
+        new_disadvantage_matrix = {}
+
+        for combatant in self.combatants:
+            new_advantage_matrix[combatant] = {
+                target: set_at_turn for target, turn in advantage_matrix.items()
+                if set_at_turn > oldest_stunt_age
+            }
+            new_disadvantage_matrix[combatant] = {
+                target: set_at_turn for target, turn in disadvantage_matrix.items()
+                if set_at_turn > oldest_stunt_age
+            }
+        self.advantage_matrix = new_advantage_matrix
+        self.disadvantage_matrix = new_disadvantage_matrix
+
+    def msg(self, message, targets=None):
+        """
+        Central place for sending messages to combatants. This allows
+        for decorating the output in one place if needed.
+
+        Args:
+            message (str): The message to send.
+            targets (Object or list, optional): Sends message only to
+                one or more particular combatants. If unset, send to
+                everyone in the combat.
+
+        """
+        if targets:
+            for target in make_iter(targets):
+                target.msg(message)
+        else:
+            for target in self.combatants:
+                target.msg(message)
+
+    def add_combatant(self, combatant):
+        if combatant not in self.combatants:
+            self.combatants.append(combatant)
+            self._refresh_distance_matrix()
+
+    def remove_combatant(self, combatant):
+        if combatant in self.combatants:
+            self.combatants.remove(combatant)
+            self._refresh_distance_matrix()
+
+    def move_relative_to(self, combatant, target_combatant, change):
         """
         Change the distance to a target.
 
         Args:
             combatant (Character): The one doing the change.
-            target_combatant (Character): The one changing towards.
+            target_combatant (Character): The one distance is changed to.
             change (int): A +/- change value. Result is always in range 0..4.
 
         """
-        self.combatants[combatant].change_distance(target_combatant, change)
-        self.combatants[target_combatant].change_distance(combatant, change)
+        current_dist = self.distance_matrix[combatant][target_combatant]
 
-    def add_combatant(self, combatant):
-        self.combatants[combatant] = CombatantStats(
-            weapon=combatant.equipment.get("weapon"),
-            armor=combatant.equipment.armor,
+        new_dist = max(MIN_RANGE, min(MAX_RANGE, current_dist + change))
+
+        self.distance_matrix[combatant][target_combatant] = new_dist
+        self.distance_matrix[target_combatant][combatant] = new_dist
+
+    def gain_advantage(self, combatant, target):
+        """
+        Gain advantage against target. Spent by actions.
+
+        """
+        self.advantage_matrix[combatant][target] = self.turn
+
+    def gain_disadvantage(self, combatant, target):
+        """
+        Gain disadvantage against target. Spent by actions.
+
+        """
+        self.disadvantage_matrix[combatant][target] = self.turn
+
+    def resolve_damage(self, attacker, defender, critical=False):
+        """
+        Apply damage to defender. On a critical hit, the damage die
+        is rolled twice.
+
+        """
+        weapon_dmg_roll = attacker.weapon.damage_roll
+
+        dmg = rules.EvAdventureRollEngine.roll(weapon_dmg_roll)
+        if critical:
+            dmg += rules.EvAdventureRollEngine.roll(weapon_dmg_roll)
+
+        defender.hp -= dmg
+
+        # call hook
+        defender.at_damage(dmg, attacker=attacker)
+
+        if defender.hp <= 0:
+            # roll on death table. This may or may not kill you
+            rules.EvAdventureRollEngine.roll_death(self)
+
+            # tell everyone
+            self.msg(defender.defeat_message(attacker, dmg))
+
+            if defender.hp > 0:
+                # they are weakened, but with hp
+                self.msg("You are alive, but out of the fight. If you want to press your luck, "
+                         "you need to rejoin the combat.", targets=defender)
+                defender.at_defeat()  # note - NPC monsters may still 'die' here
+            else:
+                # outright killed
+                defender.at_death()
+
+            # no matter the result, the combatant is out
+            self.remove_combatant(defender)
+        else:
+            # defender still alive
+            self.msg(defender)
+
+    def stunt(self, attacker, defender, attack_type="agility",
+              defense_type="agility", optimal_distance=0, suboptimal_distance=1,
+              advantage=True, beneficiary=None):
+        """
+        Stunts does not hurt anyone, but are used to give advantage/disadvantage to combatants
+        for later turns. The 'attacker' here is the one attemting the stunt against the 'defender'.
+        If successful, advantage is given to attacker against defender and disadvantage to
+        defender againt attacker. It's also possible to replace the attacker with another combatant
+        against the defender - allowing to aid/hinder others on the battlefield.
+
+        Stunt-modifers last a maximum of two turns and are not additive. Advantages and
+        disadvantages against the same target cancel each other out.
+
+        Args:
+            attacker (Object): The one attempting the stunt.
+            defender (Object): The one affected by the stunt.
+            attack_type (str): The ability tested to do the stunt.
+            defense_type (str): The ability used to defend against the stunt.
+            optimal_distance (int): At which distance the stunt works normally.
+            suboptimal_distance (int): At this distance, the stunt is performed at disadvantage.
+            advantage (bool): If False, try to apply disadvantage to defender
+                rather than advantage to attacker.
+            beneficiary (bool): If stunt succeeds, it may benefit another
+                combatant than the `attacker` doing the stunt. This allows for helping
+                allies.
+
+        """
+        # check if stunt-attacker is at optimal distance
+        distance = self.distance_matrix[attacker][defender]
+        disadvantage = False
+        if suboptimal_distance == distance:
+            # fighting at the wrong range is not good
+            disadvantage = True
+        elif self._get_optimal_distance(attacker) != distance:
+            # if we are neither at optimal nor suboptimal distance, we can't do the stunt
+            # from here.
+            raise AttackFailure(f"You can't perform this stunt "
+                                f"from {RANGE_NAMES[distance]} distance (must be "
+                                f"{RANGE_NAMES[suboptimal_distance]} or, even better, "
+                                f"{RANGE_NAMES[optimal_distance]}).")
+        # quality doesn't matter for stunts, they are either successful or not
+        is_success, _  = rules.EvAdventureRollEngine.opposed_saving_throw(
+            attacker, defender,
+            attack_type=attack_type,
+            defense_type=defense_type,
+            advantage=False, disadvantage=disadvantage,
         )
-        self._refresh_distance_matrix()
+        if is_success:
+            beneficiary = beneficiary if beneficiary else attacker
+            if advantage:
+                self.gain_advantage(beneficiary, defender)
+            else:
+                self.gain_disadvantage(defender, beneficiary)
 
-    def remove_combatant(self, combatant):
-        self.combatants.pop(combatant, None)
-        self._refresh_distance_matrix()
+        return is_success
+
+    def attack(self, attacker, defender):
+        """
+        Make an attack against a defender. This takes into account distance.
+
+        """
+        # check if attacker is at optimal distance
+        distance = self.distance_matrix[attacker][defender]
+
+        # figure out advantage (gained by previous stunts)
+        advantage = bool(self.advantage_matrix[attacker].pop(defender, False))
+
+        # figure out disadvantage (by distance or by previous action)
+        disadvantage = bool(self.disadvantage_matrix[attacker].pop(defender, False))
+        if self._get_suboptimal_distance(attacker) == distance:
+            # fighting at the wrong range is not good
+            disadvantage = True
+        elif self._get_optimal_distance(attacker) != distance:
+            # if we are neither at optimal nor suboptimal distance, we can't
+            # attack from this range
+            raise AttackFailure(f"You can't attack with {attacker.weapon.key} "
+                                f"from {RANGE_NAMES[distance]} distance.")
+
+        is_hit, quality = rules.EvAdventureRollEngine.opposed_saving_throw(
+            attacker, defender,
+            attack_type=attacker.weapon.attack_type,
+            defense_type=attacker.weapon.defense_type,
+            advantage=advantage, disadvantage=disadvantage
+        )
+        if is_hit:
+            self.resolve_damage(attacker, defender, critical=quality == "critical success")
+
+        return is_hit

evennia/contrib/tutorials/evadventure/objects.py

@@ -44,10 +44,14 @@ class EvAdventureWeapon(EvAdventureObject):
 
     """
     wield_slot = AttributeProperty(default="weapon")
+
+    attack_type = AttributeProperty(default="strength")
+    defense_type = AttributeProperty(default="armor")
     damage_roll = AttributeProperty(default="1d6")
+
     # at which ranges this weapon can be used. If not listed, unable to use
-    range_optimal = AttributeProperty(default=0)  # normal usage
-    range_suboptimal = AttributeProperty(default=1)  # usage with disadvantage
+    distance_optimal = AttributeProperty(default=0)  # normal usage (fists)
+    distance_suboptimal = AttributeProperty(default=None)  # disadvantage (fists)
 
 
 class EvAdventureRunestone(EvAdventureWeapon):

evennia/contrib/tutorials/evadventure/random_tables.py

@@ -366,3 +366,15 @@ initiative = [
     ('4-6', "PC acts first"),
 ]
 
+
+death_and_dismemberment = [
+    "dead",
+    "dead",  # original says 'dismemberment' here, we don't simulate this
+    "weakened",  # -1d4 STR
+    "unsteady",  # -1d4 DEX
+    "sickly",  # -1d4 CON
+    "addled",  # -1d4 INT
+    "rattled",  # -1d4 WIS
+    "disfigured",  # -1d4 CHA
+]
+

evennia/contrib/tutorials/evadventure/rules.py

@@ -175,61 +175,6 @@ class EvAdventureRollEngine:
             quality = None
         return (dice_roll + attack_bonus + modifier) > defender_defense, quality
 
-    # specific rolls / actions
-
-    @staticmethod
-    def melee_attack(attacker, defender, advantage=False, disadvantage=False):
-        """Close attack (strength vs armor)"""
-        return opposed_saving_throw(
-            attacker, defender, attack_type="strength", defense_type="armor",
-            advantage=advantage, disadvantage=disadvantage)
-
-    @staticmethod
-    def ranged_attack(attacker, defender, advantage=False, disadvantage=False):
-        """Ranged attack (wisdom vs armor)"""
-        return opposed_saving_throw(
-            attacker, defender, attack_type="wisdom", defense_type="armor",
-            advantage=advantage, disadvantage=disadvantage)
-
-    @staticmethod
-    def magic_attack(attacker, defender, advantage=False, disadvantage=False):
-        """Magic attack (int vs dexterity)"""
-        return opposed_saving_throw(
-            attacker, defender, attack_type="intelligence", defense_type="dexterity",
-            advantage=advantage, disadvantage=disadvantage)
-
-    @staticmethod
-    def morale_check(defender):
-        """
-        A morale check is done for NPCs/monsters. It's done with a 2d6 against
-        their morale.
-
-        Args:
-            defender (NPC): The entity trying to defend its morale.
-
-        Returns:
-            bool: False if morale roll failed, True otherwise.
-
-        """
-        return roll('2d6') <= defender.morale
-
-    @staticmethod
-    def healing_from_rest(character):
-        """
-        A meal and a full night's rest allow for regaining 1d8 + Const bonus HP.
-
-        Args:
-            character (Character): The one resting.
-
-        Returns:
-            int: How much HP was healed. This is never more than how damaged we are.
-
-        """
-        # we can't heal more than our damage
-        damage = character.hp_max - character.hp
-        healed = roll('1d8') + character.constitution
-        return min(damage, healed)
-
     @staticmethod
     def roll_random_table(dieroll, table, table_choices):
         """
@@ -283,6 +228,83 @@ class EvAdventureRollEngine:
             roll_result = max(1, min(len(table_choices), roll_result))
             return table_choices[roll_result - 1]
 
+    # specific rolls / actions
+
+    @staticmethod
+    def morale_check(defender):
+        """
+        A morale check is done for NPCs/monsters. It's done with a 2d6 against
+        their morale.
+
+        Args:
+            defender (NPC): The entity trying to defend its morale.
+
+        Returns:
+            bool: False if morale roll failed, True otherwise.
+
+        """
+        return roll('2d6') <= defender.morale
+
+    @staticmethod
+    def healing_from_rest(character):
+        """
+        A meal and a full night's rest allow for regaining 1d8 + Const bonus HP.
+
+        Args:
+            character (Character): The one resting.
+
+        Returns:
+            int: How much HP was healed. This is never more than how damaged we are.
+
+        """
+        # we can't heal more than our damage
+        damage = character.hp_max - character.hp
+        healed = roll('1d8') + character.constitution
+        return min(damage, healed)
+
+    death_map = {
+        "weakened": "strength",
+        "unsteady": "dexterity",
+        "sickly": "constitution",
+        "addled": "intelligence",
+        "rattled": "wisdom",
+        "disfigured": "charisma",
+    }
+
+    def roll_death(character):
+        """
+        Happens when hitting <= 0 hp. unless dead,
+
+        """
+
+        result = self.roll_random_table('1d8', 'death_and_dismemberment')
+        if result == "dead":
+            character.handle_death()
+        else:
+            # survives with degraded abilities (1d4 roll)
+            abi = death_map[result]
+
+            current_abi = getattr(character, abi)
+            loss = self.roll("1d4")
+
+            current_abi =- loss
+
+            if current_abi < -10:
+                # can't lose more - die
+                character.handle_death()
+            else:
+                new_hp = max(character.hp_max, self.roll("1d4"))
+                setattr(character, abi, current_abi)
+                character.hp = new_hp
+
+                character.msg(
+                    "~" * 78 +
+                    "\n|yYou survive your brush with death, "
+                    f"but are |r{result.upper()}|y and permenently |rlose {loss} {abi}|y.|n\n"
+                    f"|GYou recover |g{new_hp}|G health|.\n"
+                    + "~" * 78
+                )
+
 
 # character generation