Combat base added

nodes/combat_system.gd

@@ -0,0 +1,50 @@
+class_name CombatSystem extends Node
+
+func create_proposal(attacker: Unit, defender: Unit) -> CombatProposal:
+	var proposal := CombatProposal.new()
+
+	proposal.attacker = _snapshot(attacker, defender)
+	proposal.defender = _snapshot(defender, attacker)
+
+	return proposal
+
+func _snapshot(unit: Unit, opponent: Unit) -> CombatProposal.CombatantStats:
+	var stats := CombatProposal.CombatantStats.new()
+	stats.unit = unit
+	stats.hp = unit.current_stats.current_hp
+	stats.sp = unit.current_stats.current_sp
+	stats.hit = unit.current_stats.hit - opponent.current_stats.eva
+	stats.atk = unit.current_stats.phys_atk
+	stats.def = unit.current_stats.phys_def
+	stats.spd = unit.current_stats.spd
+	return stats
+
+func process_combat(attacker: Unit, defender: Unit) -> void:
+	var proposal := create_proposal(attacker, defender)
+	var atk_name := attacker.current_info.name
+	var def_name := defender.current_info.name
+	print("=== Combat: %s vs %s ===" % [atk_name, def_name])
+	print("  %s — HP:%d ATK:%d DEF:%d HIT:%d" % [atk_name, proposal.attacker.hp, proposal.attacker.atk, proposal.attacker.def, proposal.attacker.hit])
+	print("  %s — HP:%d ATK:%d DEF:%d HIT:%d" % [def_name, proposal.defender.hp, proposal.defender.atk, proposal.defender.def, proposal.defender.hit])
+	apply_proposal(proposal)
+	print("  Result: %s HP=%d, %s HP=%d" % [atk_name, attacker.current_stats.current_hp, def_name, defender.current_stats.current_hp])
+
+
+func apply_proposal(proposal: CombatProposal) -> void:
+	var atk_stats := proposal.attacker
+	var def_stats := proposal.defender
+	var atk_unit := atk_stats.unit
+	var def_unit := def_stats.unit
+
+	# Attacker strikes
+	var atk_roll := randi_range(1, 100)
+	if atk_roll <= atk_stats.hit:
+		var damage := maxi(atk_stats.atk - def_stats.def, 0)
+		def_unit.current_stats.current_hp -= damage
+
+	# Counterattack if defender survives
+	if def_unit.current_stats.current_hp > 0:
+		var def_roll := randi_range(1, 100)
+		if def_roll <= def_stats.hit:
+			var damage := maxi(def_stats.atk - atk_stats.def, 0)
+			atk_unit.current_stats.current_hp -= damage