'use strict';

exports.BattleScripts = {
	runMove: function (move, pokemon, targetLoc, sourceEffect, zMove, externalMove) {
		let target = this.getTarget(pokemon, zMove || move, targetLoc);
		if (!sourceEffect && toId(move) !== 'struggle' && !zMove) {
			let changedMove = this.runEvent('OverrideAction', pokemon, target, move);
			if (changedMove && changedMove !== true) {
				move = changedMove;
				target = null;
			}
		}
		let baseMove = this.getMove(move);
		move = zMove ? this.getZMoveCopy(baseMove, pokemon) : baseMove;
		if (!target && target !== false) target = this.resolveTarget(pokemon, move);

		// copy the priority for Quick Guard
		if (zMove) move.priority = baseMove.priority;
		move.isExternal = externalMove;

		this.setActiveMove(move, pokemon, target);

		/* if (pokemon.moveThisTurn) {
			// THIS IS PURELY A SANITY CHECK
			// DO NOT TAKE ADVANTAGE OF THIS TO PREVENT A POKEMON FROM MOVING;
			// USE this.cancelMove INSTEAD
			this.debug('' + pokemon.id + ' INCONSISTENT STATE, ALREADY MOVED: ' + pokemon.moveThisTurn);
			this.clearActiveMove(true);
			return;
		} */
		let willTryMove = this.runEvent('BeforeMove', pokemon, target, move);
		if (!willTryMove) {
			if (pokemon.volatiles['twoturnmove'] && pokemon.volatiles['twoturnmove'].move === move.id) { // Linked mod
				pokemon.removeVolatile('twoturnmove');
			}
			this.runEvent('MoveAborted', pokemon, target, move);
			this.clearActiveMove(true);
			// The event 'BeforeMove' could have returned false or null
			// false indicates that this counts as a move failing for the purpose of calculating Stomping Tantrum's base power
			// null indicates the opposite, as the Pokemon didn't have an option to choose anything
			pokemon.moveThisTurnResult = willTryMove;
			return;
		}
		if (move.beforeMoveCallback) {
			if (move.beforeMoveCallback.call(this, pokemon, target, move)) {
				this.clearActiveMove(true);
				pokemon.moveThisTurnResult = false;
				return;
			}
		}
		pokemon.lastDamage = 0;
		let lockedMove;
		if (!externalMove) {
			lockedMove = this.runEvent('LockMove', pokemon);
			if (lockedMove === true) lockedMove = false;
			if (!lockedMove) {
				if (!pokemon.deductPP(baseMove, null, target) && (move.id !== 'struggle')) {
					this.add('cant', pokemon, 'nopp', move);
					let gameConsole = [null, 'Game Boy', 'Game Boy', 'Game Boy Advance', 'DS', 'DS'][this.gen] || '3DS';
					this.add('-hint', "This is not a bug, this is really how it works on the " + gameConsole + "; try it yourself if you don't believe us.");
					this.clearActiveMove(true);
					pokemon.moveThisTurnResult = false;
					return;
				}
			} else {
				sourceEffect = this.getEffect('lockedmove');
			}
			pokemon.moveUsed(move, targetLoc);
		}

		// Dancer Petal Dance hack
		// TODO: implement properly
		let noLock = externalMove && !pokemon.volatiles.lockedmove;

		if (zMove) {
			if (pokemon.illusion) {
				this.singleEvent('End', this.getAbility('Illusion'), pokemon.abilityData, pokemon);
			}
			this.add('-zpower', pokemon);
			pokemon.side.zMoveUsed = true;
		}
		let moveDidSomething = this.useMove(baseMove, pokemon, target, sourceEffect, zMove);
		this.singleEvent('AfterMove', move, null, pokemon, target, move);
		this.runEvent('AfterMove', pokemon, target, move);

		// Dancer's activation order is completely different from any other event, so it's handled separately
		if (move.flags['dance'] && moveDidSomething && !move.isExternal) {
			let dancers = [];
			for (const side of this.sides) {
				for (const currentPoke of side.active) {
					if (!currentPoke || !currentPoke.hp || pokemon === currentPoke) continue;
					if (currentPoke.hasAbility('dancer') && !currentPoke.isSemiInvulnerable()) {
						dancers.push(currentPoke);
					}
				}
			}
			// Dancer activates in order of lowest speed stat to highest
			// Ties go to whichever Pokemon has had the ability for the least amount of time
			dancers.sort(function (a, b) { return -(b.stats['spe'] - a.stats['spe']) || b.abilityOrder - a.abilityOrder; });
			for (const dancer of dancers) {
				if (this.faintMessages()) break;
				this.add('-activate', dancer, 'ability: Dancer');
				this.runMove(baseMove.id, dancer, 0, this.getAbility('dancer'), undefined, true);
			}
		}
		if (noLock && pokemon.volatiles.lockedmove) delete pokemon.volatiles.lockedmove;
	},
	resolveAction: function (action, midTurn = false) {
		if (!action) throw new Error(`Action not passed to resolveAction`);

		if (!action.side && action.pokemon) action.side = action.pokemon.side;
		if (!action.move && action.moveid) action.move = this.getMoveCopy(action.moveid);
		if (!action.choice && action.move) action.choice = 'move';
		if (!action.priority && action.priority !== 0) {
			let priorities = {
				'beforeTurn': 100,
				'beforeTurnMove': 99,
				'switch': 7,
				'runUnnerve': 7.3,
				'runSwitch': 7.2,
				'runPrimal': 7.1,
				'instaswitch': 101,
				'megaEvo': 6.9,
				'residual': -100,
				'team': 102,
				'start': 101,
			};
			if (action.choice in priorities) {
				action.priority = priorities[action.choice];
			}
		}
		if (!midTurn) {
			if (action.choice === 'move') {
				if (!action.zmove && action.move.beforeTurnCallback) {
					this.addToQueue({choice: 'beforeTurnMove', pokemon: action.pokemon, move: action.move, targetLoc: action.targetLoc});
				}
				if (action.mega) {
					// TODO: Check that the Pokémon is not affected by Sky Drop.
					// (This is currently being done in `runMegaEvo`).
					this.addToQueue({
						choice: 'megaEvo',
						pokemon: action.pokemon,
					});
				}

				let linkedMoves = action.pokemon.getLinkedMoves();
				if (linkedMoves.length && !linkedMoves.disabled && !action.pokemon.getItem().isChoice && !action.zmove) {
					let decisionMove = toId(action.move);
					if (linkedMoves.includes(decisionMove)) {
						// flag the move as linked here
						action.linked = linkedMoves.map(moveId => this.getMoveCopy(moveId));
						let linkedOtherMove = action.linked[1 - linkedMoves.indexOf(decisionMove)];
						if (linkedOtherMove.beforeTurnCallback) {
							this.addToQueue({choice: 'beforeTurnMove', pokemon: action.pokemon, move: linkedOtherMove, targetLoc: action.targetLoc});
						}
					}
				}
			} else if (action.choice === 'switch' || action.choice === 'instaswitch') {
				if (typeof action.pokemon.switchFlag === 'string') {
					action.sourceEffect = this.getEffect(action.pokemon.switchFlag);
				}
				action.pokemon.switchFlag = false;
				if (!action.speed) action.speed = action.pokemon.getActionSpeed();
			}
		}

		let deferPriority = this.gen >= 7 && action.mega && action.mega !== 'done';
		if (action.move) {
			let target = null;
			action.move = this.getMoveCopy(action.move);

			if (!action.targetLoc) {
				target = this.resolveTarget(action.pokemon, action.move);
				action.targetLoc = this.getTargetLoc(target, action.pokemon);
			}

			if (!action.priority && !deferPriority) {
				let move = action.move;
				if (action.zmove) {
					// @ts-ignore
					let zMoveName = this.getZMove(action.move, action.pokemon, true);
					let zMove = this.getMove(zMoveName);
					if (zMove.exists) {
						move = zMove;
					}
				}

				let priority = move.priority;
				let linkedMoves = action.pokemon.getLinkedMoves();
				let linkIndex = -1;

				if (linkedMoves.length && !linkedMoves.disabled && !move.isZ && (linkIndex = linkedMoves.indexOf(toId(action.move))) >= 0) {
					let linkedActions = action.linked || linkedMoves.map(moveId => this.getMoveCopy(moveId));
					let altMove = linkedActions[1 - linkIndex];
					let thisPriority = this.runEvent('ModifyPriority', action.pokemon, target, linkedActions[linkIndex], priority);
					let otherPriority = this.runEvent('ModifyPriority', action.pokemon, target, altMove, altMove.priority);

					priority = Math.min(thisPriority, otherPriority);
					action.priority = priority;
					if (this.gen > 5) {
						// Gen 6+: Quick Guard blocks moves with artificially enhanced priority.
						// This also applies to Psychic Terrain.
						linkedActions[linkIndex].priority = priority;
						altMove.priority = priority;
					}
				} else {
					priority = this.runEvent('ModifyPriority', action.pokemon, target, move, priority);
					action.priority = priority;

					if (this.gen > 5) {
						// Gen 6+: Quick Guard blocks moves with artificially enhanced priority.
						// This also applies to Psychic Terrain.
						action.move.priority = priority;
					}
				}
			}
		}
		if (!action.speed) {
			if ((action.choice === 'switch' || action.choice === 'instaswitch') && action.target) {
				action.speed = action.target.getActionSpeed();
			} else if (!action.pokemon) {
				action.speed = 1;
			} else if (!deferPriority) {
				action.speed = action.pokemon.getActionSpeed();
			}
		}
		return /** @type {any} */ (action);
	},

	runAction: function (action) {
		// returns whether or not we ended in a callback
		switch (action.choice) {
		case 'start': {
			// I GIVE UP, WILL WRESTLE WITH EVENT SYSTEM LATER
			let format = this.getFormat();

			// Remove Pokémon duplicates remaining after `team` decisions.
			this.p1.pokemon = this.p1.pokemon.slice(0, this.p1.pokemonLeft);
			this.p2.pokemon = this.p2.pokemon.slice(0, this.p2.pokemonLeft);

			if (format.teamLength && format.teamLength.battle) {
				// Trim the team: not all of the Pokémon brought to Preview will battle.
				this.p1.pokemon = this.p1.pokemon.slice(0, format.teamLength.battle);
				this.p1.pokemonLeft = this.p1.pokemon.length;
				this.p2.pokemon = this.p2.pokemon.slice(0, format.teamLength.battle);
				this.p2.pokemonLeft = this.p2.pokemon.length;
			}

			this.add('start');
			for (let pos = 0; pos < this.p1.active.length; pos++) {
				this.switchIn(this.p1.pokemon[pos], pos);
			}
			for (let pos = 0; pos < this.p2.active.length; pos++) {
				this.switchIn(this.p2.pokemon[pos], pos);
			}
			for (const pokemon of this.p1.pokemon) {
				this.singleEvent('Start', this.getEffect(pokemon.species), pokemon.speciesData, pokemon);
			}
			for (const pokemon of this.p2.pokemon) {
				this.singleEvent('Start', this.getEffect(pokemon.species), pokemon.speciesData, pokemon);
			}
			this.midTurn = true;
			break;
		}

		case 'move':
			if (!action.pokemon.isActive) return false;
			if (action.pokemon.fainted) return false;
			// This is where moves are linked
			if (action.linked) {
				let linkedMoves = action.linked;
				for (let i = linkedMoves.length - 1; i >= 0; i--) {
					let pseudoAction = {choice: 'move', move: linkedMoves[i], targetLoc: action.targetLoc, pokemon: action.pokemon, targetPosition: action.targetPosition, targetSide: action.targetSide};
					this.queue.unshift(pseudoAction);
				}
				return;
			}
			// @ts-ignore
			this.runMove(action.move, action.pokemon, action.targetLoc, action.sourceEffect, action.zmove);
			break;
		case 'megaEvo':
			// @ts-ignore
			this.runMegaEvo(action.pokemon);
			break;
		case 'beforeTurnMove': {
			if (!action.pokemon.isActive) return false;
			if (action.pokemon.fainted) return false;
			this.debug('before turn callback: ' + action.move.id);
			let target = this.getTarget(action.pokemon, action.move, action.targetLoc);
			if (!target) return false;
			if (!action.move.beforeTurnCallback) throw new Error(`beforeTurnMove has no beforeTurnCallback`);
			action.move.beforeTurnCallback.call(this, action.pokemon, target);
			break;
		}

		case 'event':
			// @ts-ignore Easier than defining a custom event attribute tbh
			this.runEvent(action.event, action.pokemon);
			break;
		case 'team': {
			action.pokemon.side.pokemon.splice(action.index, 0, action.pokemon);
			action.pokemon.position = action.index;
			// we return here because the update event would crash since there are no active pokemon yet
			return;
		}

		case 'pass':
			return;
		case 'instaswitch':
		case 'switch':
			if (action.choice === 'switch' && action.pokemon.status && this.data.Abilities.naturalcure) {
				this.singleEvent('CheckShow', this.getAbility('naturalcure'), null, action.pokemon);
			}
			if (action.pokemon.hp) {
				action.pokemon.beingCalledBack = true;
				const sourceEffect = action.sourceEffect;
				// @ts-ignore
				if (sourceEffect && sourceEffect.selfSwitch === 'copyvolatile') {
					action.pokemon.switchCopyFlag = true;
				}
				if (!action.pokemon.switchCopyFlag) {
					this.runEvent('BeforeSwitchOut', action.pokemon);
					if (this.gen >= 5) {
						this.eachEvent('Update');
					}
				}
				if (!this.runEvent('SwitchOut', action.pokemon)) {
					// Warning: DO NOT interrupt a switch-out
					// if you just want to trap a pokemon.
					// To trap a pokemon and prevent it from switching out,
					// (e.g. Mean Look, Magnet Pull) use the 'trapped' flag
					// instead.

					// Note: Nothing in BW or earlier interrupts
					// a switch-out.
					break;
				}
			}
			action.pokemon.illusion = null;
			this.singleEvent('End', this.getAbility(action.pokemon.ability), action.pokemon.abilityData, action.pokemon);
			if (!action.pokemon.hp && !action.pokemon.fainted) {
				// a pokemon fainted from Pursuit before it could switch
				if (this.gen <= 4) {
					// in gen 2-4, the switch still happens
					action.priority = -101;
					this.queue.unshift(action);
					this.add('-hint', 'Pursuit target fainted, switch continues in gen 2-4');
					break;
				}
				// in gen 5+, the switch is cancelled
				this.debug('A Pokemon can\'t switch between when it runs out of HP and when it faints');
				break;
			}
			if (action.target.isActive) {
				this.add('-hint', 'Switch failed; switch target is already active');
				break;
			}
			if (action.choice === 'switch' && action.pokemon.activeTurns === 1) {
				for (const foeActive of action.pokemon.side.foe.active) {
					if (foeActive.isStale >= 2) {
						action.pokemon.isStaleCon++;
						action.pokemon.isStaleSource = 'switch';
						break;
					}
				}
			}

			this.switchIn(action.target, action.pokemon.position, action.sourceEffect);
			break;
		case 'runUnnerve':
			this.singleEvent('PreStart', action.pokemon.getAbility(), action.pokemon.abilityData, action.pokemon);
			break;
		case 'runSwitch':
			this.runEvent('SwitchIn', action.pokemon);
			if (this.gen <= 2 && !action.pokemon.side.faintedThisTurn && action.pokemon.draggedIn !== this.turn) this.runEvent('AfterSwitchInSelf', action.pokemon);
			if (!action.pokemon.hp) break;
			action.pokemon.isStarted = true;
			if (!action.pokemon.fainted) {
				this.singleEvent('Start', action.pokemon.getAbility(), action.pokemon.abilityData, action.pokemon);
				action.pokemon.abilityOrder = this.abilityOrder++;
				this.singleEvent('Start', action.pokemon.getItem(), action.pokemon.itemData, action.pokemon);
			}
			delete action.pokemon.draggedIn;
			break;
		case 'runPrimal':
			if (!action.pokemon.transformed) this.singleEvent('Primal', action.pokemon.getItem(), action.pokemon.itemData, action.pokemon);
			break;
		case 'shift': {
			if (!action.pokemon.isActive) return false;
			if (action.pokemon.fainted) return false;
			action.pokemon.activeTurns--;
			this.swapPosition(action.pokemon, 1);
			for (const foeActive of action.pokemon.side.foe.active) {
				if (foeActive.isStale >= 2) {
					action.pokemon.isStaleCon++;
					action.pokemon.isStaleSource = 'switch';
					break;
				}
			}
			break;
		}

		case 'beforeTurn':
			this.eachEvent('BeforeTurn');
			break;
		case 'residual':
			this.add('');
			this.clearActiveMove(true);
			this.updateSpeed();
			this.residualEvent('Residual');
			this.add('upkeep');
			break;
		}

		// phazing (Roar, etc)
		for (const pokemon of this.p1.active) {
			if (pokemon.forceSwitchFlag) {
				if (pokemon.hp) this.dragIn(pokemon.side, pokemon.position);
				pokemon.forceSwitchFlag = false;
			}
		}
		for (const pokemon of this.p2.active) {
			if (pokemon.forceSwitchFlag) {
				if (pokemon.hp) this.dragIn(pokemon.side, pokemon.position);
				pokemon.forceSwitchFlag = false;
			}
		}

		this.clearActiveMove();

		// fainting

		this.faintMessages();
		if (this.ended) return true;

		// switching (fainted pokemon, U-turn, Baton Pass, etc)

		if (!this.queue.length || (this.gen <= 3 && ['move', 'residual'].includes(this.queue[0].choice))) {
			// in gen 3 or earlier, switching in fainted pokemon is done after
			// every move, rather than only at the end of the turn.
			this.checkFainted();
		} else if (action.choice === 'megaEvo' && this.gen >= 7) {
			this.eachEvent('Update');
			// In Gen 7, the action order is recalculated for a Pokémon that mega evolves.
			const moveIndex = this.queue.findIndex(queuedAction => queuedAction.pokemon === action.pokemon && queuedAction.choice === 'move');
			if (moveIndex >= 0) {
				const moveAction = /** @type {MoveAction} */ (this.queue.splice(moveIndex, 1)[0]);
				moveAction.mega = 'done';
				this.insertQueue(moveAction, true);
			}
			return false;
		} else if (this.queue.length && this.queue[0].choice === 'instaswitch') {
			return false;
		}

		let p1switch = this.p1.active.some(mon => mon && !!mon.switchFlag);
		let p2switch = this.p2.active.some(mon => mon && !!mon.switchFlag);

		if (p1switch && !this.canSwitch(this.p1)) {
			for (const pokemon of this.p1.active) {
				pokemon.switchFlag = false;
			}
			p1switch = false;
		}
		if (p2switch && !this.canSwitch(this.p2)) {
			for (const pokemon of this.p2.active) {
				pokemon.switchFlag = false;
			}
			p2switch = false;
		}

		if (p1switch || p2switch) {
			if (this.gen >= 5) {
				this.eachEvent('Update');
			}
			this.makeRequest('switch');
			return true;
		}

		this.eachEvent('Update');

		return false;
	},

	pokemon: {
		moveUsed: function (move, targetLoc) {
			let lastMove = this.moveThisTurn ? [this.moveThisTurn, move] : move;
			this.lastMove = lastMove;
			this.moveThisTurn = lastMove;
			this.lastMoveTargetLoc = targetLoc;
		},
		getLastMoveAbsolute: function () { // used
			if (Array.isArray(this.lastMove)) return this.lastMove[1];
			return this.lastMove;
		},
		checkMoveThisTurn: function (move) {
			const moveId = toId(move);
			if (Array.isArray(this.moveThisTurn)) return this.moveThisTurn.some(moveUsed => moveUsed.id === moveId);
			return this.moveThisTurn && this.moveThisTurn.id === moveId;
		},
		getLinkedMoves: function () {
			let linkedMoves = this.moveSlots.slice(0, 2);
			if (linkedMoves.length !== 2 || linkedMoves[0].pp <= 0 || linkedMoves[1].pp <= 0) return [];
			let ret = [linkedMoves[0].id, linkedMoves[1].id];

			// Disabling effects which won't abort execution of moves already added to battle event loop.
			if (!this.ateBerry && ret.includes('belch')) {
				ret.disabled = true;
			} else if (this.hasItem('assaultvest') && (this.battle.getMove(ret[0]).category === 'Status' || this.battle.getMove(ret[1]).category === 'Status')) {
				ret.disabled = true;
			}
			return ret;
		},
		hasLinkedMove: function (move) {
			move = toId(move);
			let linkedMoves = this.getLinkedMoves();
			if (!linkedMoves.length) return;
			return linkedMoves[0] === move || linkedMoves[1] === move;
		},
	},
};