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use forge_foundation::ZoneType;
use super::{matches_valid_cards_for_sa, EffectContext};
/// `SP$ ControlGainVariant` — complex control redistribution.
///
/// Mirrors Java's `ControlGainVariantEffect.java`.
///
/// # Params
/// - `ChangeController` — mode: "CardOwner", "Random", etc.
/// - `AllValid` — filter for which permanents are affected
/// Struct form of this effect so it can participate in the
/// `SpellAbilityEffect` trait hierarchy — mirrors Java's
/// `ControlGainVariantEffect` class extending `SpellAbilityEffect`.
#[manabrew_engine_macros::spell_effect(ControlGainVariantEffect)]
fn resolve(ctx: &mut EffectContext, sa: &crate::spellability::SpellAbility) {
let mode = sa
.ir
.change_type
.clone()
.unwrap_or_else(|| "CardOwner".to_string());
let filter = sa
.ir
.all_valid_text
.clone()
.unwrap_or_else(|| "Permanent".to_string());
let filter_selector = sa.ir.all_valid_selector.clone();
// Collect all matching permanents on the battlefield
let matching: Vec<crate::ids::CardId> = {
let mut result = Vec::new();
for &pid in &ctx.game.player_order.clone() {
let zone_cards = ctx.game.cards_in_zone(ZoneType::Battlefield, pid).to_vec();
for cid in zone_cards {
if matches_valid_cards_for_sa(
ctx.game,
sa,
ctx.game.card(cid),
filter_selector.as_ref(),
&filter,
) {
result.push(cid);
}
}
}
result
};
match mode.as_str() {
"CardOwner" => {
// Homeward Path: return each permanent to its owner's control
for cid in matching {
let owner = ctx.game.card(cid).owner;
if ctx.game.card(cid).can_be_controlled_by(owner) {
ctx.game.change_controller(cid, owner);
}
}
}
"Random" => {
// Scrambleverse: assign each permanent to a random player
let alive = ctx.game.alive_players();
if alive.is_empty() {
return;
}
for cid in matching {
let random_idx = ctx.rng.next_int(alive.len() as i32) as usize;
let new_controller = alive[random_idx];
if ctx.game.card(cid).can_be_controlled_by(new_controller) {
ctx.game.change_controller(cid, new_controller);
}
}
}
_ => {
// Other modes (multiplayer-specific) are logged and skipped
eprintln!("[ControlGainVariant] Unimplemented mode: {}", mode);
}
}
}