manabrew-engine 0.2.4

Magic: The Gathering rules engine — a Rust port of Forge
Documentation
use serde::{Deserialize, Serialize};

use crate::event::RunParams;
use crate::game::GameState;
use crate::parsing::{keys, Params};
use crate::spellability::SpellAbility;
use crate::trigger::TriggerType;

use super::trigger::TriggerBehavior;

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TriggerPayCumulativeUpkeep {
    pub valid_card: Option<crate::parsing::CompiledSelector>,
    pub paid: Option<bool>,
}

impl TriggerPayCumulativeUpkeep {
    pub fn parse(params: &Params) -> Box<dyn TriggerBehavior> {
        Box::new(Self {
            valid_card: params.selector_cloned(keys::VALID_CARD),
            paid: params.get("Paid").map(|v| v.eq_ignore_ascii_case("true")),
        })
    }
}

#[typetag::serde]
impl TriggerBehavior for TriggerPayCumulativeUpkeep {
    fn trigger_type(&self) -> TriggerType {
        TriggerType::PayCumulativeUpkeep
    }

    fn perform_test(
        &self,
        trigger: &super::trigger::Trigger,
        params: &RunParams,
        game: &GameState,
    ) -> bool {
        let _host_card = trigger.base.card_trait_base.host_card_id();
        let _host_controller = trigger.base.card_trait_base.host_controller(game);
        if let Some(expected_paid) = self.paid {
            if params.cumulative_upkeep_paid != Some(expected_paid) {
                return false;
            }
        }

        trigger.matches_optional_valid_card_filter(&self.valid_card, params.card, game)
    }

    fn set_triggering_objects(
        &self,
        _trigger: &super::trigger::Trigger,
        sa: &mut SpellAbility,
        params: &RunParams,
        _game: &GameState,
    ) {
        if let Some(card) = params.card {
            sa.set_triggering_object(crate::ability::AbilityKey::Card, card.0.to_string());
        }
        if let Some(mana) = params.produced.as_ref() {
            sa.set_triggering_object(crate::ability::AbilityKey::PayingMana, mana);
        }
    }

    fn get_important_stack_objects(
        &self,
        _trigger: &super::trigger::Trigger,
        sa: &SpellAbility,
    ) -> String {
        format!(
            "Mana: {}",
            sa.trigger_objects
                .get(&crate::ability::AbilityKey::PayingMana)
                .map(|s| s.as_str())
                .unwrap_or("")
        )
    }
}