manabrew_engine/ability/effects/
copy_spell_ability_effect.rs

1use super::EffectContext;
2use crate::event::RunParams;
3use crate::replacement::replacement_handler::{apply_replacements, ReplacementEvent};
4use crate::replacement::ReplacementResult;
5use crate::spellability::SpellAbility;
6use crate::trigger::TriggerType;
7
8/// Configure the spell ability during construction.
9/// Mirrors Java `CopySpellAbilityEffect.buildSpellAbility` — sets the target zone
10/// to Stack so the ability targets spells on the stack.
11pub fn build_spell_ability(sa: &mut SpellAbility) {
12    if sa.uses_targeting() {
13        if let Some(ref mut tr) = sa.target_restrictions {
14            tr.tgt_zone = vec![forge_foundation::ZoneType::Stack];
15        }
16    }
17}
18
19/// `SP$ CopySpellAbility` — copy the top spell on the stack.
20///
21/// Mirrors Java's `CopySpellAbilityEffect.java` (basic version).
22/// Creates a clone of the topmost spell on the stack with the same targets.
23/// Full retargeting support deferred.
24///
25/// # Card script examples
26/// ```text
27/// A:SP$ CopySpellAbility | Defined$ TopStack
28/// A:SP$ CopySpellAbility | Defined$ TriggeredSpellAbility
29/// ```
30/// Struct form of this effect so it can participate in the
31/// `SpellAbilityEffect` trait hierarchy — mirrors Java's
32/// `CopySpellAbilityEffect` class extending `SpellAbilityEffect`.
33#[manabrew_engine_macros::spell_effect(CopySpellAbilityEffect)]
34fn resolve(ctx: &mut EffectContext, sa: &crate::spellability::SpellAbility) {
35    let controller = sa.activating_player;
36
37    // Run CopySpell replacement effects before copying.
38    let mut event = ReplacementEvent::CopySpell {
39        player: controller,
40        count: 1,
41    };
42    let result = apply_replacements(ctx.game, &mut event);
43    if result == ReplacementResult::Skipped || result == ReplacementResult::Replaced {
44        return;
45    }
46
47    let original = if let Some(defined) = sa.defined() {
48        crate::ability::ability_utils::get_defined_spell_abilities(defined, sa, ctx.game)
49            .into_iter()
50            .next()
51    } else {
52        let stack_entries: Vec<_> = ctx.game.stack.iter().collect();
53        stack_entries.iter().rev().find_map(|entry| {
54            if Some(entry.id) != sa.ir.stack_id {
55                Some(entry.spell_ability.clone())
56            } else {
57                None
58            }
59        })
60    };
61
62    let original = match original {
63        Some(spell) => spell,
64        None => return,
65    };
66    if crate::card::card_factory::spell_ability_cant_be_copied(&ctx.game.cards, &original) {
67        return;
68    }
69
70    // Clone the spell ability with same targets using CardFactory parity helper.
71    let copy = crate::card::card_factory::copy_spell_ability(&original, controller);
72
73    // Push the copy onto the stack (it will resolve like a normal spell)
74    let copy_entry = crate::spellability::StackEntry {
75        id: 0, // will be assigned by push()
76        spell_ability: copy,
77        is_pending_cast: false,
78        is_creature_spell: original.is_spell
79            && original
80                .source
81                .is_some_and(|cid| ctx.game.card(cid).is_creature()),
82        is_permanent_spell: original.is_spell
83            && original
84                .source
85                .is_some_and(|cid| ctx.game.card(cid).is_permanent()),
86        cast_from_zone: None,
87        optional_trigger_decider: None,
88        optional_trigger_description: None,
89        optional_trigger_source_name: None,
90    };
91
92    let trigger_sa = copy_entry.spell_ability.clone();
93    ctx.game.stack.push(copy_entry);
94    if let Some(source_id) = trigger_sa.source {
95        ctx.trigger_handler.run_trigger(
96            TriggerType::SpellCopied,
97            RunParams {
98                spell_card: Some(source_id),
99                spell_controller: Some(controller),
100                source_sa: Some(trigger_sa.clone()),
101                ..Default::default()
102            },
103            false,
104        );
105        super::emit_targeting_triggers(ctx, source_id, &trigger_sa);
106    }
107}
manabrew_engine/ability/effects/copy_spell_ability_effect.rs

manabrew_engine/ability/effects/
copy_spell_ability_effect.rs
