package game

import (
	"log"

	"muhq.space/muhqs-game/go/utils"
)

func adjustMelee(p Permanent, damage int) {
	u, ok := p.(*Unit)
	if !ok {
		return
	}

	if INVALID_ATTACK(u.Attack) {
		u.Attack.attacks = append(u.Attack.attacks, 1)
	} else {
		if u.Attack.attacks[0]+damage == 0 {
			u.Attack.attacks = nil
		} else {
			u.Attack.attacks[0] += damage
		}
	}
}

func adjustAttack(p Permanent, damage int) {
	u, ok := p.(*Unit)
	if !ok {
		return
	}

	if INVALID_ATTACK(u.Attack) {
		u.Attack.attacks = append(u.Attack.attacks, damage)
	} else {
		// TODO: remove 0 attacks
		for i := range u.Attack.attacks {
			u.Attack.attacks[i] += damage
		}
	}
}

func adjustMovement(p Permanent, delta int) {
	u, ok := p.(*Unit)
	if !ok {
		return
	}

	if u.Movement == INVALID_MOVEMENT() && delta > 0 {
		u.Movement.Range = delta
	} else {
		u.Movement.Range += delta
	}
}

func adjustHealth(p Permanent, delta int) {
	if u, ok := p.(*Unit); ok {
		u.Health += delta
	}
}

// ====== Base Set ======

type advisorImpl struct{ cardImplementationBase }

func (*advisorImpl) fullActions(u *Unit) []*FullAction {
	resolvePrototype := func(a Action) ActionResolveFunc {
		u := a.Source().(*Unit)
		return func(s *State) {
			controller := u.Controller()
			controller.DrawN(1)
			cards := controller.PromptHandCardSelection(0, 1)
			if cards != nil {
				controller.Hand.MoveCard(cards[0], s.Exile)
			}
		}
	}
	return []*FullAction{newFullAction(u, resolvePrototype, "draw 1. exile 1")}
}

type missionaryImpl struct{ cardImplementationBase }

func (*missionaryImpl) fullActions(u *Unit) []*FullAction {
	resolvePrototype := func(a Action) ActionResolveFunc {
		u := a.Source().(*Unit)
		target := a.Target().sel[0].(*Unit)
		return func(s *State) {
			target.adjustMarks(UnitMarks.Faith, 2)
			if target.Marks(UnitMarks.Faith) > target.Card().BuyCost {
				target.controller = u.Controller()
			}
		}
	}
	s := u.Controller().gameState
	a := newFullAction(u, resolvePrototype, "put faith ...")
	a.targets = newTargets(newTarget(s, newTargetDesc("unit"), a))
	return []*FullAction{a}
}

type swordImpl struct{ cardImplementationBase }

func (*swordImpl) onPile(p Permanent)   { adjustMelee(p, 1) }
func (*swordImpl) onUnpile(p Permanent) { adjustMelee(p, -1) }

type greatSwordImpl struct{ cardImplementationBase }

func (*greatSwordImpl) onPile(p Permanent)   { adjustMelee(p, 2) }
func (*greatSwordImpl) onUnpile(p Permanent) { adjustMelee(p, -2) }

type misinformationImpl struct{ cardImplementationBase }

func (*misinformationImpl) onPlay(s *State, c *Card, _ *Player, _ *Targets) {
	s.Exile.AddCard(c)
}

type pioneerImpl struct{ cardImplementationBase }

func (*pioneerImpl) fullActions(u *Unit) []*FullAction {
	resolvePrototype := func(a Action) ActionResolveFunc {
		return func(s *State) {
			target := a.Target().sel[0]
			if artifact, ok := target.(*Artifact); ok {
				s.destroyPermanent(artifact)
			} else {
				tile := target.(*Tile)
				tile.neutralize()
			}
		}
	}

	s := u.Controller().gameState
	a := newFullAction(u, resolvePrototype, "neutralize tile or artifact")
	a.targets = newTargets(newTarget(s, newTargetDesc("adjacent tile or adjacent artifact"), a))
	return []*FullAction{a}
}

type recruiterImpl struct{ cardImplementationBase }

func (*recruiterImpl) fullActions(u *Unit) []*FullAction {
	resolvePrototype := func(a Action) ActionResolveFunc {
		u := a.Source().(*Unit)
		return func(s *State) {
			t := a.Target().sel[0].(*Tile)
			s.addNewUnit(NewCard("base/recruit"), t.Position, u.Controller())
		}
	}

	s := u.Controller().gameState
	a := newFullAction(u, resolvePrototype, "create recruit")
	a.targets = newTargets(newTarget(s, newTargetDesc("adjacent tile"), a))
	return []*FullAction{a}
}

func (*recruiterImpl) additionalSpawnsFor(p Permanent, ct CardType) []*Tile {
	if ct != CardTypes.Unit {
		return nil
	}

	s := p.Controller().gameState
	return TilesInRange(s.Map, p, 1)
}

type shieldImpl struct{ cardImplementationBase }

func (*shieldImpl) onPile(p Permanent)   { adjustHealth(p, 1) }
func (*shieldImpl) onUnpile(p Permanent) { adjustHealth(p, -1) }

type taxCollectorImpl struct{ cardImplementationBase }

func (*taxCollectorImpl) fullActions(u *Unit) []*FullAction {
	resolvePrototype := func(a Action) ActionResolveFunc {
		u := a.Source().(*Unit)
		return func(s *State) {
			controller := u.Controller()
			controller.gainResource(2)
		}
	}

	a := newFullAction(u, resolvePrototype, "gain 2")
	return []*FullAction{a}
}

type towerShieldImpl struct{ cardImplementationBase }

func (*towerShieldImpl) onPile(p Permanent)   { adjustHealth(p, 2) }
func (*towerShieldImpl) onUnpile(p Permanent) { adjustHealth(p, -2) }

type wormtongueImpl struct{ cardImplementationBase }

func (*wormtongueImpl) fullActions(u *Unit) []*FullAction {
	resolvePrototype := func(a Action) ActionResolveFunc {
		return func(s *State) {
			t := a.Target().sel[0].(*Player)
			t.DiscardPile.AddCard(NewCard("base/misinformation"))
		}
	}

	s := u.Controller().gameState
	a := newFullAction(u, resolvePrototype, "misinform")
	// TODO: implement player targeting
	a.targets = newTargets(newTarget(s, newTargetDesc("opponent"), a))
	return []*FullAction{a}
}

// ====== Magic Set ======

type attackImpl struct{ cardImplementationBase }

func (*attackImpl) playTargets() TargetDesc {
	return TargetDesc{"unit", "0-2"}
}

func (*attackImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	sel := t.Cur().sel
	switch len(sel) {
	case 1:
		s.addEotEffect(newAttackModificationEffect(sel[0].(*Unit), 2))
	case 2:
		s.addEotEffect(newAttackModificationEffect(sel[0].(*Unit), 1))
		s.addEotEffect(newAttackModificationEffect(sel[1].(*Unit), 1))
	}
}

type healImpl struct{ cardImplementationBase }

func (*healImpl) playTargets() TargetDesc {
	return newTargetDesc("unit")
}

func (*healImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	u := t.Cur().sel[0].(*Unit)
	// TODO: prompt damage or poison choice
	u.adjustDamage(-2)
}

type dieImpl struct{ cardImplementationBase }

func (*dieImpl) playTargets() TargetDesc {
	return newTargetDesc("unit")
}

type moreImpl struct{ cardImplementationBase }

func (*moreImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	p.DrawN(2)
}

type mineImpl struct{ cardImplementationBase }

func (*mineImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	stolen := 0
	for _, player := range s.Players {
		if p == player || !p.IsEnemy(player) {
			continue
		}
		player.reduceResource(2)
		stolen += 2
	}
	p.gainResource(stolen)
}

func (*dieImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	s.destroyPermanent(t.Cur().sel[0].(Permanent))
}

type ritualImpl struct{ cardImplementationBase }

func (*ritualImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	p.gainResource(3)
}

type rushImpl struct{ cardImplementationBase }

func (*rushImpl) playTargets() TargetDesc {
	return TargetDesc{"unit", "0-2"}
}

func (*rushImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	sel := t.Cur().sel
	switch len(sel) {
	case 1:
		s.addEotEffect(newMovementModificationEffect(sel[0].(*Unit), 2))
	case 2:
		s.addEotEffect(newMovementModificationEffect(sel[0].(*Unit), 1))
		s.addEotEffect(newMovementModificationEffect(sel[1].(*Unit), 1))
	}
}

type selectImpl struct{ cardImplementationBase }

func (*selectImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	p.DrawN(1)
	cards := p.PromptHandCardSelection(0, 1)
	if cards != nil {
		p.Hand.MoveCard(cards[0], s.Exile)
	}
}

type shroudImpl struct{ cardImplementationBase }

func (*shroudImpl) playTargets() TargetDesc {
	return newTargetDesc("unit")
}

func (*shroudImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	u := t.Cur().sel[0].(*Unit)
	s.addEotEffect(newTmpEffect(u, "shroud"))
}

type switchImpl struct{ cardImplementationBase }

func (*switchImpl) playTargets() TargetDesc {
	return TargetDesc{"permanent", "2"}
}

func (*switchImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	perms := utils.InterfaceSliceToTypedSlice[Permanent](t.Cur().sel)
	s.switchPermanents(perms[0], perms[1])
}

type transmuteImpl struct{ cardImplementationBase }

func (*transmuteImpl) playTargets() TargetDesc {
	return newTargetDesc("store card")
}

func (*transmuteImpl) onPlay(s *State, c *Card, p *Player, t *Targets) {
	storeCard := t.Cur().sel[0].(*Card)
	p.Store.MoveCard(storeCard, p.Hand)
	s.Exile.AddCard(c)
}

// ====== Nautics Set ======

var fishTrapAoE areaEffect = newGrantFullActionEffect("nautics/fisher",
	func(a Action) ActionResolveFunc {
		u := a.Source().(*Unit)
		return func(s *State) {
			controller := u.Controller()
			controller.gainResource(2)
		}
	}, "gain 2 resource", "fishTrapAction")

type fishTrapImpl struct {
	cardImplementationBase
	aoe areaEffect
}

func (*fishTrapImpl) additionalSpawnsFor(Permanent, CardType) []*Tile { return nil }
func (*fishTrapImpl) stateBasedActions(*State, Permanent)             {}

func (i *fishTrapImpl) onEntering(t *Tile) {
	s := t.Permanent.Controller().gameState
	for _, tile := range TilesInRange(s.Map, t.Permanent, 1) {
		tile.addEffect(i.aoe)
	}
}

func (i *fishTrapImpl) onLeaving(t *Tile) {
	s := t.Permanent.Controller().gameState
	for _, tile := range TilesInRange(s.Map, t.Permanent, 1) {
		tile.removeEffect(i.aoe)
	}
}

type fisherImpl struct{ cardImplementationBase }

func (*fisherImpl) fullActions(u *Unit) []*FullAction {
	s := u.Controller().gameState
	resolvePrototype := func(a Action) ActionResolveFunc {
		u := a.Source().(*Unit)
		return func(s *State) {
			t := a.Target().sel[0].(*Tile)
			s.addNewArtifact(NewCard("nautics/fish_trap"), t.Position, u.Controller())
		}
	}
	a := newFullAction(u, resolvePrototype, "create fish trap")
	a.targets = newTargets(newTarget(s, newTargetDesc("adjacent free water tile"), a))
	return []*FullAction{a}
}

type captainImpl struct{ cardImplementationBase }

func (*captainImpl) onPile(containing Permanent) {
	// TODO: implement static effect
}

func (*captainImpl) onUnpile(containing Permanent) {
	// TODO: remove static effect
}

type sailorImpl struct{ cardImplementationBase }

func (*sailorImpl) onPile(containing Permanent) {
	if u, ok := containing.(*Unit); ok && u.Movement.Swimming {
		u.Movement.Range += 1
	}
}

func (*sailorImpl) onUnpile(containing Permanent) {
	if u, ok := containing.(*Unit); ok && u.Movement.Swimming {
		u.Movement.Range -= 1
	}
}

// ====== Kraken Set ======

type tidesChangeImpl struct{ cardImplementationBase }

func (*tidesChangeImpl) onPlay(s *State, _ *Card, _ *Player, _ *Targets) {
	s.redistributeMapStoreCards()
}

type dejaVuImpl struct{ cardImplementationBase }

func (*dejaVuImpl) onPlay(s *State, _ *Card, _ *Player, _ *Targets) {
	for _, p := range s.Players {
		if !p.IsKraken() {
			p.Resource = s.Map.ResourceGain
		}
	}
}

type devourThePoorImpl struct{ cardImplementationBase }

func (*devourThePoorImpl) onPlay(s *State, _ *Card, kraken *Player, _ *Targets) {
	for _, u := range s.EnemyUnits(kraken) {
		if u.Card().BuyCost < 7 {
			s.destroyPermanent(u)
		}
	}
}

type dolphinImpl struct{ cardImplementationBase }

func (*dolphinImpl) fullActions(u *Unit) []*FullAction {
	s := u.Controller().gameState
	resolvePrototype := func(a Action) ActionResolveFunc {
		return func(s *State) {
			t := a.Target().sel[0].(*Unit)

			// 1. +1 Attack
			// 2. +1 Armor
			// 3. +2 Movement
			// 4. +1 Action
			// 5. +2 Pierce
			// 6. All
			choice := s.Rand.Intn(5) + 1
			switch choice {
			case 1:
				s.addEotEffect(newAttackModificationEffect(t, 1))
			case 2:
			case 3:
				s.addEotEffect(newMovementModificationEffect(t, 1))
			case 4:
			case 5:
			case 6:
			}

			// TODO: implement eot effects
		}
	}
	a := newFullAction(u, resolvePrototype, "random dolphin buff")
	a.targets = newTargets(newTarget(s, newTargetDesc("adjacent akkied unit"), a))
	return []*FullAction{a}
}

type drownedSailorImpl struct { sailorImpl }

func (*drownedSailorImpl) onDrop(sailor Permanent) {
	sailor.Controller().gameState.destroyPermanent(sailor)
}

// TODO: implement death trigger
// TODO: implement hook for the containing permanent on pile
type flyingDutchmenImpl struct{ cardImplementation }

type frostPylonAoE struct{}

func (*frostPylonAoE) onEntering(Permanent) {
	// TODO: prevent actions and grant new full action
}

func (*frostPylonAoE) onLeaving(Permanent) {
	// TODO: remove effect
}

type frostPylonImpl struct {
	cardImplementationBase
	aoe frostPylonAoE
}

func (*frostPylonImpl) spawnTiles(s *State, kraken *Player) (spawns []*Tile) {
	for _, u := range s.EnemyUnits(kraken) {
		spawns = append(spawns, TilesInRange(s.Map, u, 1)...)
	}
	return
}

func (*frostPylonImpl) stateBasedActions(s *State, p Permanent) {
	if p.Marks(PermanentMarks.Crack) >= 3 {
		s.destroyPermanent(p)
	}
}

func (i *frostPylonImpl) onEntering(t *Tile) {
	s := t.Permanent.Controller().gameState
	for _, tile := range TilesInRange(s.Map, t.Permanent, 1) {
		tile.addEffect(&i.aoe)
	}
}

func (i *frostPylonImpl) onLeaving(t *Tile) {
	s := t.Permanent.Controller().gameState
	for _, tile := range TilesInRange(s.Map, t.Permanent, 1) {
		tile.removeEffect(&i.aoe)
	}
}

type giganticHailImpl struct {
	cardImplementationBase
}

func (*giganticHailImpl) playTargets() TargetDesc { return INVALID_TARGET_DESC }

func (*giganticHailImpl) onPlay(s *State, _ *Card, kraken *Player, _ *Targets) {
	emptyTiles := s.Map.FreeTiles()
	choices := len(emptyTiles)
	for i := 0; i < 3; i++ {
		if choices == 0 {
			return
		}

		choice := s.Rand.Intn(choices - 1)
		s.addNewArtifact(NewCard("kraken/ice_berg"), emptyTiles[choice].Position, kraken)
		emptyTiles[choice] = emptyTiles[choices-1]
		choices--
	}
}

type soldOutImpl struct{ cardImplementationBase }

func (*soldOutImpl) onPlay(s *State, _ *Card, kraken *Player, _ *Targets) {
	nStores := len(s.Map.Stores)
	storePositions := make([]Position, 0, nStores)
	for pos := range s.Map.Stores {
		storePositions = append(storePositions, pos)
	}

	storePos := storePositions[s.Rand.Intn(nStores-1)]
	s.Map.StoreOn(storePos).MoveInto(s.Exile)

	storeTile := s.Map.TileAt(storePos)
	storeTile.neutralize()
}

type supriseImpl struct{ cardImplementationBase }

func (*supriseImpl) onPlay(s *State, _ *Card, kraken *Player, _ *Targets) {
	kraken.Ctrl.(*KrakenControl).activeSuprise = true
}

type tentacleSlapImpl struct{ cardImplementationBase }

func (*tentacleSlapImpl) playTargets() TargetDesc { return INVALID_TARGET_DESC }

func (*tentacleSlapImpl) onPlay(s *State, _ *Card, kraken *Player, _ *Targets) {
	x := 0
	for _, p := range s.Players {
		if p.IsKraken() {
			continue
		}

		x += p.Hand.Size()
		p.discardHand()
	}

	gain := 5 - x
	if gain > 0 {
		kraken.gainResource(gain)
	}
}

type unholyCannonballImpl struct{ cardImplementationBase }

func (*unholyCannonballImpl) playTargets() TargetDesc { return INVALID_TARGET_DESC }

func (*unholyCannonballImpl) onPlay(s *State, _ *Card, kraken *Player, _ *Targets) {
	krakenTiles := s.Map.FilterTiles(func(t *Tile) bool { return t.Raw == "the kraken" })
	if len(krakenTiles) != 1 {
		log.Fatal("No kraken tile found in Map")
	}

	enemiesInRange2 := []*Unit{}
	for _, u := range s.EnemyUnits(kraken) {
		if u.Tile() == nil {
			continue
		}

		if IsPositionInRange(u.Tile().Position, krakenTiles[0].Position, 2) {
			enemiesInRange2 = append(enemiesInRange2, u)
			break
		}
	}

	if len(enemiesInRange2) == 0 {
		kraken.gainResource(5)
	} else {
		for _, u := range enemiesInRange2 {
			u.adjustMarks(UnitStates.Panic, 1)
		}
	}
}

func init() {
	cardImplementations = map[string]cardImplementation{
		"base/advisor":        &advisorImpl{},
		"base/missionary":     &missionaryImpl{},
		"base/sword":          &swordImpl{},
		"base/greatsword":     &greatSwordImpl{},
		"base/misinformation": &misinformationImpl{},
		"base/pioneer":        &pioneerImpl{},
		"base/recruiter":      &recruiterImpl{},
		"base/shield":         &shieldImpl{},
		"base/tax_collector":  &taxCollectorImpl{},
		"base/tower_shield":   &towerShieldImpl{},
		"base/wormtongue":     &wormtongueImpl{},

		"magic/attack!":    &attackImpl{},
		"magic/die!":       &dieImpl{},
		"magic/heal!":      &healImpl{},
		"magic/more!":      &moreImpl{},
		"magic/mine!":      &mineImpl{},
		"magic/ritual!":    &ritualImpl{},
		"magic/rush!":      &rushImpl{},
		"magic/select!":    &selectImpl{},
		"magic/shroud!":    &shroudImpl{},
		"magic/switch!":    &switchImpl{},
		"magic/transmute!": &transmuteImpl{},

		"nautics/captain":   &captainImpl{},
		"nautics/fish_trap": &fishTrapImpl{aoe: fishTrapAoE},
		"nautics/fisher":    &fisherImpl{},
		"nautics/sailor":    &sailorImpl{},

		"kraken/deja_vu!":          &dejaVuImpl{},
		"kraken/devour_the_poor!":  &devourThePoorImpl{},
		"kraken/dolphin":           &dolphinImpl{},
		"kraken/drowned_sailor":    &drownedSailorImpl{},
		"kraken/flying_dutchmen":   &flyingDutchmenImpl{},
		"kraken/frost_pylon":       &frostPylonImpl{},
		"kraken/gigantic_hail":     &giganticHailImpl{},
		"kraken/sold_out!":         &soldOutImpl{},
		"kraken/suprise!":          &supriseImpl{},
		"kraken/tentacle_slap":     &tentacleSlapImpl{},
		"kraken/tides_change!":     &tidesChangeImpl{},
		"kraken/unholy_cannonball": &unholyCannonballImpl{},
	}
}