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import type { PokemonEventMethods, ConditionData } from './dex-conditions';
import { assignMissingFields, BasicEffect, toID } from './dex-data';
import { Utils } from '../lib/utils';

interface AbilityEventMethods {
	onCheckShow?: (this: Battle, pokemon: Pokemon) => void;
	onEnd?: (this: Battle, target: Pokemon & Side & Field) => void;
	onStart?: (this: Battle, target: Pokemon) => void;
}

/* Possible Ability flags */
interface AbilityFlags {
	breakable?: 1; // Can be suppressed by Mold Breaker and related effects
	cantsuppress?: 1; // Ability can't be suppressed by e.g. Gastro Acid or Neutralizing Gas
	failroleplay?: 1; // Role Play fails if target has this Ability
	failskillswap?: 1; // Skill Swap fails if either the user or target has this Ability
	noentrain?: 1; // Entrainment fails if user has this Ability
	noreceiver?: 1; // Receiver and Power of Alchemy will not activate if an ally faints with this Ability
	notrace?: 1; // Trace cannot copy this Ability
	notransform?: 1; // Disables the Ability if the user is Transformed
}

export interface AbilityData extends Partial<Ability>, AbilityEventMethods, PokemonEventMethods {
	name: string;
}

export type ModdedAbilityData = AbilityData | Partial<AbilityData> & { inherit: true };
export interface AbilityDataTable { [abilityid: IDEntry]: AbilityData }
export interface ModdedAbilityDataTable { [abilityid: IDEntry]: ModdedAbilityData }

export class Ability extends BasicEffect implements Readonly<BasicEffect> {
	declare readonly effectType: 'Ability';

	/** Rating from -1 Detrimental to +5 Essential; see `data/abilities.ts` for details. */
	readonly rating: number;
	readonly suppressWeather: boolean;
	readonly flags: AbilityFlags;
	declare readonly condition?: ConditionData;

	constructor(data: AnyObject) {
		super(data);

		this.fullname = `ability: ${this.name}`;
		this.effectType = 'Ability';
		this.suppressWeather = !!data.suppressWeather;
		this.flags = data.flags || {};
		this.rating = data.rating || 0;

		if (!this.gen) {
			if (this.num >= 268) {
				this.gen = 9;
			} else if (this.num >= 234) {
				this.gen = 8;
			} else if (this.num >= 192) {
				this.gen = 7;
			} else if (this.num >= 165) {
				this.gen = 6;
			} else if (this.num >= 124) {
				this.gen = 5;
			} else if (this.num >= 77) {
				this.gen = 4;
			} else if (this.num >= 1) {
				this.gen = 3;
			}
		}
		assignMissingFields(this, data);
	}
}

const EMPTY_ABILITY = Utils.deepFreeze(new Ability({ id: '', name: '', exists: false }));

export class DexAbilities {
	readonly dex: ModdedDex;
	readonly abilityCache = new Map<ID, Ability>();
	allCache: readonly Ability[] | null = null;

	constructor(dex: ModdedDex) {
		this.dex = dex;
	}

	get(name: string | Ability = ''): Ability {
		if (name && typeof name !== 'string') return name;
		const id = toID(name.trim());
		return this.getByID(id);
	}

	getByID(id: ID): Ability {
		if (id === '') return EMPTY_ABILITY;
		let ability = this.abilityCache.get(id);
		if (ability) return ability;

		if (this.dex.data.Aliases.hasOwnProperty(id)) {
			ability = this.get(this.dex.data.Aliases[id]);
		} else if (id && this.dex.data.Abilities.hasOwnProperty(id)) {
			const abilityData = this.dex.data.Abilities[id] as any;
			const abilityTextData = this.dex.getDescs('Abilities', id, abilityData);
			ability = new Ability({
				name: id,
				...abilityData,
				...abilityTextData,
			});
			if (ability.gen > this.dex.gen) {
				(ability as any).isNonstandard = 'Future';
			}
			if (this.dex.currentMod === 'gen7letsgo' && ability.id !== 'noability') {
				(ability as any).isNonstandard = 'Past';
			}
			if ((this.dex.currentMod === 'gen7letsgo' || this.dex.gen <= 2) && ability.id === 'noability') {
				(ability as any).isNonstandard = null;
			}
		} else {
			ability = new Ability({
				id, name: id, exists: false,
			});
		}

		if (ability.exists) this.abilityCache.set(id, this.dex.deepFreeze(ability));
		return ability;
	}

	all(): readonly Ability[] {
		if (this.allCache) return this.allCache;
		const abilities = [];
		for (const id in this.dex.data.Abilities) {
			abilities.push(this.getByID(id as ID));
		}
		this.allCache = abilities;
		return this.allCache;
	}
}