package game

import (
	"slices"
	"testing"
)

// testGame builds a started 2-player game without going through the lobby.
func testGame(t *testing.T) (*Game, *Player, *Player) {
	t.Helper()
	g := New()
	p1, err := g.AddPlayer("Alice")
	if err != nil {
		t.Fatal(err)
	}
	p2, err := g.AddPlayer("Bob")
	if err != nil {
		t.Fatal(err)
	}
	if g.Phase != PhaseShop {
		t.Fatalf("expected shop phase after both players join, got %s", g.Phase)
	}
	// Pin the (otherwise random) priority token to seat 0 so tests are
	// deterministic: seat 0 shops first and wins battle simultaneity races.
	g.PrioritySeat = p1.Seat
	g.Turn = p1.Seat
	return g, p1, p2
}

// pet mints a plain effect-less pet for battle scenarios.
func (g *Game) pet(name string, power int) Card {
	return Card{ID: g.newCardID(), Kind: KindPet, Name: name, Tier: 1, Power: power, Suit: SuitRed}
}

// realPet mints a copy of a real pet (with its effects) by name, searching
// all tiers.
func (g *Game) realPet(t *testing.T, name string) Card {
	t.Helper()
	for tierIdx, tier := range petTiers {
		for _, tmpl := range tier {
			if tmpl.Name == name {
				return Card{
					ID: g.newCardID(), Kind: KindPet, Name: tmpl.Name, Tier: tierIdx + 1,
					Power: tmpl.Power, Suit: tmpl.Suits[0],
					Effects: tmpl.Effects, EffectText: tmpl.EffectText,
				}
			}
		}
	}
	t.Fatalf("no pet named %s", name)
	return Card{}
}

// tier1 is kept as a shorthand for realPet.
func (g *Game) tier1(t *testing.T, name string) Card { return g.realPet(t, name) }

// realFood mints a shop food card (Honey, Garlic, ...) from its template.
func (g *Game) realFood(t *testing.T, name string) Card {
	t.Helper()
	for tierIdx, tier := range foodTiers {
		for _, f := range tier {
			if f.Name == name {
				return Card{
					ID: g.newCardID(), Kind: KindFood, Name: f.Name, Tier: tierIdx + 1,
					Food: f.Food, Perk: f.Perk, Effects: f.Effects, EffectText: f.EffectText,
				}
			}
		}
	}
	t.Fatalf("no food named %s", name)
	return Card{}
}

func (g *Game) newHoney(t *testing.T) Card { return g.realFood(t, "Honey") }

// forceBattle sets both decks, arranges them in current order, and resolves.
func forceBattle(t *testing.T, g *Game, d1, d2 []Card) *BattleResult {
	t.Helper()
	g.Players[0].Deck = d1
	g.Players[1].Deck = d2
	g.Phase = PhaseArrange
	g.Players[0].Ready = false
	g.Players[1].Ready = false
	for _, p := range g.Players {
		ids := make([]string, len(p.Deck))
		for i, c := range p.Deck {
			ids[i] = c.ID
		}
		if err := g.SubmitOrder(p.ID, ids); err != nil {
			t.Fatal(err)
		}
	}
	if g.Phase != PhaseBattle {
		t.Fatalf("expected battle phase, got %s", g.Phase)
	}
	return g.Battle
}

func eventsOfType(res *BattleResult, typ string) []BattleEvent {
	var out []BattleEvent
	for _, ev := range res.Events {
		if ev.Type == typ {
			out = append(out, ev)
		}
	}
	return out
}

// The worked example from the rules: a 3-power pet fights a 5-power pet. The
// 3 dies, the 5 survives with 3 damage markers (2 health left, 5 attack).
// Then a 2-power pet trades with it: both die.
func TestBattleDamageMarkers(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.pet("Three", 3), g.pet("Two", 2)},
		[]Card{g.pet("Five", 5)},
	)
	clashes := eventsOfType(res, "clash")
	if len(clashes) != 2 {
		t.Fatalf("expected 2 clashes, got %d", len(clashes))
	}
	first := clashes[0]
	if !first.Died[0] || first.Died[1] {
		t.Fatalf("first clash: 3-power should die, 5-power should survive: %+v", first)
	}
	if first.Damage[1] != 3 {
		t.Fatalf("5-power pet should carry 3 damage, has %d", first.Damage[1])
	}
	second := clashes[1]
	if !second.Died[0] || !second.Died[1] {
		t.Fatalf("second clash: both should die (5 attack kills the 2; 3+2 damage kills the 5): %+v", second)
	}
	if res.WinnerSeat != -1 {
		t.Fatalf("battle should be a draw, winner=%d", res.WinnerSeat)
	}
	if g.Players[0].Trophies != 0 || g.Players[1].Trophies != 0 {
		t.Fatal("no trophies on a draw")
	}
}

func TestBattleEqualPowerBothDie(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.pet("A", 4)},
		[]Card{g.pet("B", 4)},
	)
	clashes := eventsOfType(res, "clash")
	if len(clashes) != 1 || !clashes[0].Died[0] || !clashes[0].Died[1] {
		t.Fatalf("equal power pets should both die: %+v", clashes)
	}
	if res.WinnerSeat != -1 {
		t.Fatal("expected a draw")
	}
}

func TestBattleWinnerGetsTrophy(t *testing.T) {
	g, _, p2 := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.pet("Small", 1)},
		[]Card{g.pet("Big", 5)},
	)
	if res.WinnerSeat != 1 {
		t.Fatalf("seat 1 should win, got %d", res.WinnerSeat)
	}
	if res.Trophies != 1 || p2.Trophies != 1 {
		t.Fatalf("round 1 win should award 1 trophy, got %d/%d", res.Trophies, p2.Trophies)
	}
}

func TestBattleFinalRoundWorthTwoTrophies(t *testing.T) {
	g, _, p2 := testGame(t)
	g.Round = MaxRounds
	res := forceBattle(t, g,
		[]Card{g.pet("Small", 1)},
		[]Card{g.pet("Big", 5)},
	)
	if res.Trophies != 2 || p2.Trophies != 2 {
		t.Fatalf("final round win should award 2 trophies, got %d/%d", res.Trophies, p2.Trophies)
	}
}

// Foods attach to the next pet revealed beneath them; each apple adds 1
// power. 3+2 apples = 5 power draws with a plain 5.
func TestBattleApplesBuffNextPet(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.newApple(), g.newApple(), g.pet("Buffed", 3)},
		[]Card{g.pet("Enemy", 5)},
	)
	clash := eventsOfType(res, "clash")[0]
	if !clash.Died[0] || !clash.Died[1] {
		t.Fatalf("5 vs 3+2apples should kill both: %+v", clash)
	}
	if res.WinnerSeat != -1 {
		t.Fatal("expected draw")
	}
}

// A side whose stack holds only foods can't field a pet and loses without a
// single clash.
func TestBattleFoodOnlyLoses(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.pet("Solo", 1)},
		[]Card{g.newApple()},
	)
	if len(eventsOfType(res, "clash")) != 0 {
		t.Fatal("expected no clashes")
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("seat 0 should win by default, got %d", res.WinnerSeat)
	}
}

// Ant's faint puts an apple on top of its owner's stack, buffing the next
// pet revealed: Ant(1)+Follower(2) beats a plain 2.
func TestAntFaintAddsApple(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.tier1(t, "Ant"), g.pet("Follower", 2)},
		[]Card{g.pet("Enemy", 2)},
	)
	summons := eventsOfType(res, "summon")
	if len(summons) != 1 || summons[0].Seat != 0 || summons[0].Card.Food != FoodApple {
		t.Fatalf("ant faint should summon an apple for seat 0: %+v", summons)
	}
	// Follower fights at 3 power vs enemy at 2 power with 1 damage: enemy
	// dies, follower survives (2 damage < 3 power).
	if res.WinnerSeat != 0 {
		t.Fatalf("apple-buffed follower should win, got seat %d", res.WinnerSeat)
	}
}

// Cricket's faint summons a bee, which fights as a real 1-power pet.
func TestCricketFaintSummonsBee(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.tier1(t, "Cricket")},
		[]Card{g.pet("Enemy", 3)},
	)
	summons := eventsOfType(res, "summon")
	if len(summons) != 1 || summons[0].Card.Name != "Bee" {
		t.Fatalf("cricket faint should summon a bee: %+v", summons)
	}
	beeRevealed := false
	for _, ev := range eventsOfType(res, "reveal") {
		if ev.Card.Name == "Bee" {
			beeRevealed = true
		}
	}
	if !beeRevealed {
		t.Fatal("the summoned bee should be revealed and fight")
	}
	// Cricket (1) then Bee (1) chip the 3-power enemy for 2 total; enemy
	// survives with 2 damage and wins.
	if res.WinnerSeat != 1 {
		t.Fatalf("enemy should survive with 2 damage, got winner %d", res.WinnerSeat)
	}
	if len(eventsOfType(res, "clash")) != 2 {
		t.Fatal("expected two clashes: cricket then bee")
	}
}

// Mosquito's rock lands before the clash and can kill outright: with a
// rigged roll of 1, a 1-power enemy dies to the rock and the mosquito never
// takes damage.
func TestMosquitoRockKillsBeforeClash(t *testing.T) {
	g, _, _ := testGame(t)
	g.RollDie = func() int { return 1 }
	res := forceBattle(t, g,
		[]Card{g.tier1(t, "Mosquito")},
		[]Card{g.pet("Weakling", 1)},
	)
	rocks := eventsOfType(res, "rock")
	if len(rocks) != 1 || rocks[0].Seat != 0 || rocks[0].Target != 1 {
		t.Fatalf("expected one rock from seat 0 at seat 1: %+v", rocks)
	}
	if rocks[0].Roll != 1 || !rocks[0].TargetDied || rocks[0].DamageAfter != 1 {
		t.Fatalf("rock should kill the 1-power pet: %+v", rocks[0])
	}
	if len(eventsOfType(res, "clash")) != 0 {
		t.Fatal("no clash should happen; the rock already won it")
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("mosquito should win, got %d", res.WinnerSeat)
	}
}

// A rock can roll blank faces: 0 damage, no effect, then a normal clash.
func TestMosquitoRockCanMiss(t *testing.T) {
	g, _, _ := testGame(t)
	g.RollDie = func() int { return 0 }
	res := forceBattle(t, g,
		[]Card{g.tier1(t, "Mosquito")},
		[]Card{g.pet("Weakling", 1)},
	)
	rocks := eventsOfType(res, "rock")
	if len(rocks) != 1 || rocks[0].Roll != 0 || rocks[0].TargetDied || rocks[0].DamageAfter != 0 {
		t.Fatalf("blank roll should do nothing: %+v", rocks)
	}
	if len(eventsOfType(res, "clash")) != 1 {
		t.Fatal("the clash should still happen after a miss")
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("mosquito still wins the clash 2v1, got %d", res.WinnerSeat)
	}
}

// Two mosquitos rock each other simultaneously (roll 1 each); both survive
// (2 power, 1 damage), then clash and both die.
func TestMosquitoMirror(t *testing.T) {
	g, _, _ := testGame(t)
	g.RollDie = func() int { return 1 }
	res := forceBattle(t, g,
		[]Card{g.tier1(t, "Mosquito")},
		[]Card{g.tier1(t, "Mosquito")},
	)
	if len(eventsOfType(res, "rock")) != 2 {
		t.Fatal("both mosquitos should throw rocks")
	}
	clash := eventsOfType(res, "clash")[0]
	if !clash.Died[0] || !clash.Died[1] {
		t.Fatalf("both wounded mosquitos should die in the clash: %+v", clash)
	}
	if res.WinnerSeat != -1 {
		t.Fatal("expected a draw")
	}
}

// Flamingo's faint stacks two apples: the follower fights at +2.
func TestFlamingoFaintAddsTwoApples(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Flamingo"), g.pet("Follower", 2)},
		[]Card{g.pet("Enemy", 3)},
	)
	if len(eventsOfType(res, "summon")) != 2 {
		t.Fatalf("flamingo should summon 2 apples: %+v", eventsOfType(res, "summon"))
	}
	// Follower at 4 power vs enemy at 3 power carrying 1 damage: enemy
	// dies, follower survives (3 damage < 4 power).
	if res.WinnerSeat != 0 {
		t.Fatalf("buffed follower should win, got %d", res.WinnerSeat)
	}
}

// Peacock eats an apple every time it's hurt and survives.
func TestPeacockEatsWhenHurt(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Peacock")}, // 2 power
		[]Card{g.pet("Chip", 1), g.pet("Chip2", 1)},
	)
	// Clash 1: peacock takes 1 (alive at 2 power), eats → 3 power.
	// Clash 2: takes 1 more (2 damage < 3 power), eats → 4 power.
	eats := eventsOfType(res, "eat")
	if len(eats) != 2 {
		t.Fatalf("peacock should eat twice, got %+v", eats)
	}
	if eats[0].Bonus != 1 || eats[1].Bonus != 2 {
		t.Fatalf("bonus should grow 1 then 2: %+v", eats)
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("peacock should survive and win, got %d", res.WinnerSeat)
	}
}

// Rat's faint puts a bee on the ENEMY's stack, where it fights for them.
func TestRatFaintSummonsBeeForEnemy(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Rat"), g.pet("Closer", 9)}, // rat: 4 power
		[]Card{g.pet("Equal", 4)},
	)
	summons := eventsOfType(res, "summon")
	if len(summons) != 1 || summons[0].Seat != 1 || summons[0].Card.Name != "Bee" {
		t.Fatalf("rat should summon a bee on the enemy stack: %+v", summons)
	}
	// Rat and Equal trade (both die). The bee fights for seat 1 next and
	// loses to the Closer.
	beeRevealedBySeat1 := false
	for _, ev := range eventsOfType(res, "reveal") {
		if ev.Card.Name == "Bee" && ev.Seat == 1 {
			beeRevealedBySeat1 = true
		}
	}
	if !beeRevealedBySeat1 {
		t.Fatal("the enemy should reveal and field the rat's bee")
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("seat 0 should win, got %d", res.WinnerSeat)
	}
}

// Spider pushes a bee then an apple: the apple ends up on top, so it buffs
// the bee to 2 power.
func TestSpiderFaintBeeGetsApple(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Spider")}, // 2 power
		[]Card{g.pet("Enemy", 3)},
	)
	summons := eventsOfType(res, "summon")
	if len(summons) != 2 || summons[0].Card.Name != "Bee" || summons[1].Card.Food != FoodApple {
		t.Fatalf("spider should summon bee then apple: %+v", summons)
	}
	// Enemy (3 power) takes 2 from spider, then fights the 2-power bee
	// (1+apple): both die. Draw.
	if res.WinnerSeat != -1 {
		t.Fatalf("expected draw, got %d", res.WinnerSeat)
	}
}

// Honey is a perk: the pet it's attached to summons a bee when it faints,
// and only the last-applied perk counts.
func TestHoneyPerk(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.newHoney(t), g.newHoney(t), g.pet("Bear", 2)},
		[]Card{g.pet("Enemy", 3)},
	)
	summons := eventsOfType(res, "summon")
	if len(summons) != 1 || summons[0].Card.Name != "Bee" || summons[0].Seat != 0 {
		t.Fatalf("exactly one honey (the last-applied) should trigger: %+v", summons)
	}
	// Bear dies to the 3; enemy carries 2 damage; the bee finishes it and
	// dies too: draw.
	if res.WinnerSeat != -1 {
		t.Fatalf("expected draw, got %d", res.WinnerSeat)
	}
}

// Garlic prevents 1 damage from every attack that hits its pet.
func TestGarlicPreventsDamage(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realFood(t, "Garlic"), g.pet("Tank", 2)},
		[]Card{g.pet("Equal", 2)},
	)
	// Tank takes 2-1=1 (survives at 2 power); Equal takes 2 and dies.
	clash := eventsOfType(res, "clash")[0]
	if clash.Died[0] || !clash.Died[1] {
		t.Fatalf("garlic tank should survive the equal-power clash: %+v", clash)
	}
	if clash.Damage[0] != 1 {
		t.Fatalf("garlic should reduce the hit to 1, got %d", clash.Damage[0])
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("garlic side should win, got %d", res.WinnerSeat)
	}
}

// Two garlic'd 1-power pets can never hurt each other: the battle must end
// as a stalemate draw instead of looping forever.
func TestGarlicStalemateIsDraw(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realFood(t, "Garlic"), g.pet("A", 1)},
		[]Card{g.realFood(t, "Garlic"), g.pet("B", 1)},
	)
	if res.WinnerSeat != -1 {
		t.Fatalf("stalemate should be a draw, got %d", res.WinnerSeat)
	}
	if len(res.Events) > 10 {
		t.Fatalf("stalemate should end immediately, got %d events", len(res.Events))
	}
}

// Dolphin throws 3 rocks on play (rigged to roll 1 each = 3 damage).
func TestDolphinThrowsThreeRocks(t *testing.T) {
	g, _, _ := testGame(t)
	g.RollDie = func() int { return 1 }
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Dolphin")},
		[]Card{g.pet("Tank", 3)},
	)
	rocks := eventsOfType(res, "rock")
	if len(rocks) != 1 || rocks[0].Roll != 3 || !rocks[0].TargetDied {
		t.Fatalf("dolphin should roll 3 dice for 3 damage and kill the tank: %+v", rocks)
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("dolphin should win, got %d", res.WinnerSeat)
	}
}

// Camel pushes an apple onto its own stack whenever it's hurt and survives.
func TestCamelHurtSummonsApple(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Camel"), g.pet("Ally", 2)}, // camel: 3 power
		[]Card{g.pet("Chip", 1), g.pet("Chip2", 3)},
	)
	// Clash 1: camel takes 1 (survives) → apple onto A's stack. Clash 2 vs
	// Chip2: both die. A reveals apple + Ally (3 power) and wins.
	summons := eventsOfType(res, "summon")
	if len(summons) != 1 || summons[0].Seat != 0 || summons[0].Card.Food != FoodApple {
		t.Fatalf("camel should summon one apple onto its own stack: %+v", summons)
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("apple-buffed ally should win, got %d", res.WinnerSeat)
	}
}

// Sheep faints into two bees that fight on.
func TestSheepFaintSummonsTwoBees(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Sheep")}, // 3 power
		[]Card{g.pet("Big", 5)},
	)
	summons := eventsOfType(res, "summon")
	if len(summons) != 2 || summons[0].Card.Name != "Bee" || summons[1].Card.Name != "Bee" {
		t.Fatalf("sheep should summon 2 bees: %+v", summons)
	}
	// Big (5) takes 3 from sheep, then 1 from each bee: 5 total = dead; the
	// second bee dies with it. Draw.
	if res.WinnerSeat != -1 {
		t.Fatalf("expected draw, got %d", res.WinnerSeat)
	}
}

// Dodo recycles up to 3 of its attached apples onto the deck when it faints.
func TestDodoRecyclesApples(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.newApple(), g.newApple(), g.realPet(t, "Dodo"), g.pet("Heir", 5)}, // dodo: 3+2=5
		[]Card{g.pet("Big", 6)},
	)
	// Dodo (5) dies to the 6; Big carries 5 damage. The two apples come
	// back on top: Heir fights at 5+2=7, survives Big's 6 attack, kills it.
	summons := eventsOfType(res, "summon")
	if len(summons) != 2 {
		t.Fatalf("dodo should recycle exactly its 2 apples: %+v", summons)
	}
	for _, s := range summons {
		if s.Seat != 0 || s.Card.Food != FoodApple {
			t.Fatalf("recycled cards should be seat 0 apples: %+v", s)
		}
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("recycled apples should carry the win, got %d", res.WinnerSeat)
	}
}

// Dog eats one apple per friendly bee that has fainted this battle.
func TestDogEatsPerFaintedBee(t *testing.T) {
	g, _, _ := testGame(t)
	res := forceBattle(t, g,
		[]Card{g.tier1(t, "Cricket"), g.realPet(t, "Dog")}, // cricket 1, dog 2
		[]Card{g.pet("Chip", 1), g.pet("Wall", 2)},
	)
	// Cricket and Chip trade; cricket's bee then dies to Wall (1 friendly
	// bee fainted, Wall at 1 damage). Dog plays, eats 1 apple → 3 power,
	// and beats the wounded Wall.
	eats := eventsOfType(res, "eat")
	if len(eats) != 1 || eats[0].Seat != 0 || eats[0].Bonus != 1 {
		t.Fatalf("dog should eat exactly 1 apple: %+v", eats)
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("dog should win, got %d", res.WinnerSeat)
	}
}

// Badger sets aside on faint; when the next friendly pet plays it throws 2
// rocks at EACH active pet — enemy and friend alike.
func TestBadgerDelayedRocksHitBothSides(t *testing.T) {
	g, _, _ := testGame(t)
	g.RollDie = func() int { return 1 }
	res := forceBattle(t, g,
		[]Card{g.realPet(t, "Badger"), g.pet("Next", 3)}, // badger: 3
		[]Card{g.pet("Tank", 5)},
	)
	// Clash: badger dies (takes 5), Tank keeps 3 damage (2 health). Next
	// plays → badger throws 2 rocks (2 damage) at Next AND at Tank: Next
	// drops to 1 health, Tank dies at 5 damage. Seat 0 wins.
	rocks := eventsOfType(res, "rock")
	if len(rocks) != 2 {
		t.Fatalf("badger should produce one rock volley per active pet: %+v", rocks)
	}
	hitSelf, hitEnemy := false, false
	for _, r := range rocks {
		if r.Roll != 2 {
			t.Fatalf("each volley should roll 2 dice = 2 damage: %+v", r)
		}
		if r.Target == 0 {
			hitSelf = true
			if r.TargetDied {
				t.Fatalf("Next (3 power) should survive 2 self-damage: %+v", r)
			}
		}
		if r.Target == 1 {
			hitEnemy = true
			if !r.TargetDied {
				t.Fatalf("Tank (5 power, 3 damage) should die to 2 more: %+v", r)
			}
		}
	}
	if !hitSelf || !hitEnemy {
		t.Fatalf("badger must hit both sides: %+v", rocks)
	}
	if res.WinnerSeat != 0 {
		t.Fatalf("seat 0 should win, got %d", res.WinnerSeat)
	}
}

// Temporary cards (apples, bees) leave the deck once the battle is
// acknowledged; pets stay.
func TestTemporariesExpireAfterBattle(t *testing.T) {
	g, p1, p2 := testGame(t)
	forceBattle(t, g,
		[]Card{g.newApple(), g.pet("Keeper", 3)},
		[]Card{g.pet("Enemy", 1)},
	)
	if err := g.AcknowledgeBattle(p1.ID); err != nil {
		t.Fatal(err)
	}
	if err := g.AcknowledgeBattle(p2.ID); err != nil {
		t.Fatal(err)
	}
	if slices.ContainsFunc(p1.Deck, func(c Card) bool { return c.Temporary }) {
		t.Fatalf("temporary cards should be gone after the battle: %+v", p1.Deck)
	}
	if len(p1.Deck) != 1 || p1.Deck[0].Name != "Keeper" {
		t.Fatalf("pets should survive the round: %+v", p1.Deck)
	}
}

// TestPriorityTokenInitialAssignment checks the token starts on a real seat
// and that seat opens the shop.
func TestPriorityTokenInitialAssignment(t *testing.T) {
	g := New()
	if _, err := g.AddPlayer("Alice"); err != nil {
		t.Fatal(err)
	}
	if _, err := g.AddPlayer("Bob"); err != nil {
		t.Fatal(err)
	}
	if g.PrioritySeat < 0 || g.PrioritySeat >= len(g.Players) {
		t.Fatalf("priority token should start on a real seat, got %d", g.PrioritySeat)
	}
	if g.Turn != g.PrioritySeat {
		t.Fatalf("priority holder should open the shop: turn=%d priority=%d", g.Turn, g.PrioritySeat)
	}
}

// TestPriorityWinsRockRace: two pets that both throw rocks on play would each
// kill the other, so whoever has priority throws first and survives. Flipping
// the token flips the winner, proving the token — not seat order — decides.
func TestPriorityWinsRockRace(t *testing.T) {
	for _, priority := range []int{0, 1} {
		g, _, _ := testGame(t)
		g.RollDie = func() int { return 2 } // 3 dice = 6, lethal to a 2-power pet
		g.PrioritySeat = priority
		res := forceBattle(t, g,
			[]Card{g.realPet(t, "Dolphin")},
			[]Card{g.realPet(t, "Dolphin")})
		if res.WinnerSeat != priority {
			t.Fatalf("priority seat %d should win the rock race, winner=%d", priority, res.WinnerSeat)
		}
	}
}

// TestPriorityTokenTransfer: a winner who holds the token hands it to the
// loser; a loser who holds it keeps it; a draw leaves it put.
func TestPriorityTokenTransfer(t *testing.T) {
	// Winner holds it -> passes to the loser.
	g, _, _ := testGame(t)
	g.PrioritySeat = 0
	forceBattle(t, g, []Card{g.pet("Champ", 9)}, []Card{g.pet("Chump", 1)})
	if g.Battle.WinnerSeat != 0 {
		t.Fatalf("seat 0 should win, got %d", g.Battle.WinnerSeat)
	}
	if g.PrioritySeat != 1 {
		t.Fatalf("winner should hand the token to the loser, priority=%d", g.PrioritySeat)
	}

	// Loser holds it -> keeps it.
	g, _, _ = testGame(t)
	g.PrioritySeat = 1
	forceBattle(t, g, []Card{g.pet("Champ", 9)}, []Card{g.pet("Chump", 1)})
	if g.Battle.WinnerSeat != 0 {
		t.Fatalf("seat 0 should win, got %d", g.Battle.WinnerSeat)
	}
	if g.PrioritySeat != 1 {
		t.Fatalf("a losing token holder should keep it, priority=%d", g.PrioritySeat)
	}

	// Draw -> token stays put. Equal-power pets trade lethal blows at once.
	g, _, _ = testGame(t)
	g.PrioritySeat = 0
	forceBattle(t, g, []Card{g.pet("A", 3)}, []Card{g.pet("B", 3)})
	if g.Battle.WinnerSeat != -1 {
		t.Fatalf("mutual KO should draw, got %d", g.Battle.WinnerSeat)
	}
	if g.PrioritySeat != 0 {
		t.Fatalf("a draw should leave the token put, priority=%d", g.PrioritySeat)
	}
}