package game

import (
	"fmt"
	"strings"

	"thehouseoficarus/internal/combat"
	"thehouseoficarus/internal/net"
	"thehouseoficarus/internal/player"
	"thehouseoficarus/internal/world"
)

func (g *Game) doTrigger(sess *net.Session, input string) {
	p := sess.Player.(*player.Player)
	input = strings.TrimSpace(input)

	if input == "" {
		sess.WriteLine("Trigger what? Type 'mods' to see available mods.")
		return
	}

	mod, targetArg := g.parseTriggerArgs(input)
	if mod == nil {
		sess.WriteLine("Unknown mod. Type 'mods' to see available mods.")
		return
	}

	if p.Level(player.Science) < mod.Level {
		sess.WriteLine(fmt.Sprintf("You need level %d science to trigger %s.", mod.Level, mod.Name))
		return
	}

	if !g.hasJunkCost(p, mod) {
		sess.WriteLine(fmt.Sprintf("You don't have enough junk to trigger %s.", mod.Name))
		return
	}

	switch mod.Category {
	case ModCombat:
		g.triggerCombatMod(sess, p, mod, targetArg)
	case ModTransport:
		g.triggerTransport(sess, p, mod)
	case ModProcessing:
		g.triggerProcessing(sess, p, mod, targetArg)
	case ModUtility:
		g.triggerUtility(sess, p, mod, targetArg)
	case ModEnchant:
		g.triggerEnchant(sess, p, mod, targetArg)
	}
}

func (g *Game) parseTriggerArgs(input string) (*ModDef, string) {
	lower := strings.ToLower(input)
	words := strings.Fields(lower)
	for i := len(words); i > 0; i-- {
		candidate := strings.Join(words[:i], " ")
		mod := FindMod(candidate)
		if mod != nil {
			target := strings.TrimSpace(strings.Join(words[i:], " "))
			return mod, target
		}
	}
	return nil, ""
}

func (g *Game) triggerCombatMod(sess *net.Session, p *player.Player, mod *ModDef, targetArg string) {
	if cs := combat.GetCombat(p.Name); cs != nil {
		p.AutocastMod = mod.ID
		sess.WriteLine(fmt.Sprintf("You switch to triggering %s.", mod.Name))
		return
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	var mobTarget string
	if targetArg == "" {
		mobTarget = g.resolveDefaultMob(p.RoomID)
		if mobTarget == "" {
			sess.WriteLine("Trigger on what?")
			return
		}
	} else {
		mobTarget = targetArg
	}

	mob := g.findMob(sess, mobTarget, p.RoomID)
	if mob == nil {
		return
	}

	if mob.HP <= 0 {
		sess.WriteLine("That is already dead.")
		return
	}

	if mob.Protected {
		sess.WriteLine(fmt.Sprintf("You can't attack %s!", mobDisplayName(mob, true)))
		return
	}

	if combat.IsMobInCombat(mob.InstanceID) {
		sess.WriteLine(fmt.Sprintf("%s is already engaged in combat!", mobDisplayName(mob, false)))
		return
	}

	p.AutocastMod = mod.ID
	g.startCombat(sess, p, mob)
}

func (g *Game) triggerTransport(sess *net.Session, p *player.Player, mod *ModDef) {
	if combat.GetCombat(p.Name) != nil {
		sess.WriteLine("You can't teleport during combat!")
		return
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	g.consumeJunkCost(p, mod)

	sciXP := int(mod.BaseXP)
	if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
		sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d science! ***", p.Level(player.Science))))
	}
	if p.OptionBool("xp_drops") {
		sess.WriteLine(g.colorize(sess, "xp", fmt.Sprintf("+%dxp sci", sciXP)))
	}
	g.AccountStore.SaveCharacter(p)

	if g.Hub != nil {
		for _, other := range g.Hub.PlayersInRoom(p.RoomID) {
			if other != sess {
				other.WriteLine(fmt.Sprintf("\n%s teleports away.", p.Name))
			}
		}
	}

	sess.WriteLine(fmt.Sprintf("\nYou activate %s...", mod.Name))

	p.RoomID = mod.Destination
	if g.Hub != nil {
		g.Hub.LeaveRoom(sess)
		g.Hub.EnterRoom(sess, p.RoomID)
	}

	room, _ := g.World.LoadRoom(p.RoomID)
	destName := fmt.Sprintf("room %d", p.RoomID)
	if room != nil {
		destName = room.Name
	}
	sess.WriteLine(fmt.Sprintf("You materialize at %s.", destName))
	g.AccountStore.SaveCharacter(p)
	g.doLook(sess)
}

func (g *Game) triggerProcessing(sess *net.Session, p *player.Player, mod *ModDef, targetArg string) {
	if combat.GetCombat(p.Name) != nil {
		sess.WriteLine("You can't do that during combat!")
		return
	}

	if targetArg == "" {
		sess.WriteLine(fmt.Sprintf("Usage: trigger %s <item>", strings.ReplaceAll(mod.ID, "_", " ")))
		return
	}

	slot, inv := g.findInventoryItem(p, targetArg)
	if slot < 0 {
		sess.WriteLine("You don't have that item.")
		return
	}

	itemDef, err := g.ItemStore.Load(inv.ItemID)
	if err != nil || itemDef.Value <= 0 {
		sess.WriteLine("That item has no value.")
		return
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	g.consumeJunkCost(p, mod)

	creditValue := itemDef.Value
	if mod.ID == "low_process" {
		creditValue = itemDef.Value / 2
		if creditValue < 1 {
			creditValue = 1
		}
	}

	if inv.Quantity > 1 {
		inv.Quantity--
	} else {
		p.SetInvSlot(slot, nil)
	}

	p.Credits += creditValue

	sciXP := int(mod.BaseXP)
	var leveledUp []player.SkillName
	if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
		leveledUp = append(leveledUp, player.Science)
	}
	g.AccountStore.SaveCharacter(p)

	for _, skill := range leveledUp {
		sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d %s! ***", p.Level(skill), skill)))
	}

	sess.WriteLine(fmt.Sprintf("You process the %s. You receive %s credits.",
		itemDef.Name, g.colorize(sess, "credits_pickup", fmt.Sprint(creditValue))))

	if p.OptionBool("xp_drops") {
		sess.WriteLine(g.colorize(sess, "xp", fmt.Sprintf("+%dxp sci", sciXP)))
	}
}

func (g *Game) triggerUtility(sess *net.Session, p *player.Player, mod *ModDef, targetArg string) {
	switch mod.ID {
	case "bones_to_nutrients":
		g.triggerBonesToNutrients(sess, p, mod)
	case "em_grab":
		g.triggerEmGrab(sess, p, mod, targetArg)
	case "superheat":
		g.triggerSuperheat(sess, p, mod, targetArg)
	}
}

func (g *Game) triggerBonesToNutrients(sess *net.Session, p *player.Player, mod *ModDef) {
	if combat.GetCombat(p.Name) != nil {
		sess.WriteLine("You can't do that during combat!")
		return
	}

	boneCount := p.CountItem("bones")
	if boneCount == 0 {
		sess.WriteLine("You don't have any bones.")
		return
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	g.consumeJunkCost(p, mod)

	for i := 0; i < 28; i++ {
		slot := p.InvSlot(i)
		if slot != nil && slot.ItemID == "bones" {
			slot.ItemID = "nutrient_bar"
		}
	}

	sciXP := int(mod.BaseXP) * boneCount
	if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
		sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d science! ***", p.Level(player.Science))))
	}
	g.AccountStore.SaveCharacter(p)

	sess.WriteLine(fmt.Sprintf("You convert %d bones into nutrient bars.", boneCount))
	if p.OptionBool("xp_drops") {
		sess.WriteLine(g.colorize(sess, "xp", fmt.Sprintf("+%dxp sci", sciXP)))
	}
}

func (g *Game) triggerEmGrab(sess *net.Session, p *player.Player, mod *ModDef, targetArg string) {
	if targetArg == "" {
		sess.WriteLine("Grab what? Usage: trigger em grab <item>")
		return
	}

	if p.FirstFreeSlot() < 0 {
		sess.WriteLine("Your inventory is full.")
		return
	}

	groundItems := g.World.GroundItems(p.RoomID)
	var matchedID string
	for itemID := range groundItems {
		def, _ := g.ItemStore.Load(itemID)
		if def != nil && def.MatchesName(targetArg) {
			matchedID = itemID
			break
		}
		if strings.HasPrefix(itemID, strings.ToLower(targetArg)) {
			matchedID = itemID
			break
		}
	}

	if matchedID == "" {
		sess.WriteLine("You don't see that here.")
		return
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	g.consumeJunkCost(p, mod)

	qty := groundItems[matchedID]
	g.World.RemoveGroundItem(p.RoomID, matchedID, qty)

	def, _ := g.ItemStore.Load(matchedID)
	name := matchedID
	if def != nil {
		name = def.Name
	}

	freeSlot := p.FirstFreeSlot()
	p.SetInvSlot(freeSlot, &player.InventorySlot{ItemID: matchedID, Quantity: qty})

	sciXP := int(mod.BaseXP)
	if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
		sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d science! ***", p.Level(player.Science))))
	}
	g.AccountStore.SaveCharacter(p)

	sess.WriteLine(fmt.Sprintf("You magnetically pull the %s toward you.", name))
	if p.OptionBool("xp_drops") {
		sess.WriteLine(g.colorize(sess, "xp", fmt.Sprintf("+%dxp sci", sciXP)))
	}
}

func (g *Game) triggerSuperheat(sess *net.Session, p *player.Player, mod *ModDef, targetArg string) {
	if combat.GetCombat(p.Name) != nil {
		sess.WriteLine("You can't do that during combat!")
		return
	}

	if targetArg == "" {
		sess.WriteLine("Superheat what? Usage: trigger superheat <ore>")
		return
	}

	slot, inv := g.findInventoryItem(p, targetArg)
	if slot < 0 {
		sess.WriteLine("You don't have that item.")
		return
	}

	recipe := g.RecipeStore.FindByInput("smelt", inv.ItemID)
	if recipe == nil {
		sess.WriteLine("You can't superheat that.")
		return
	}

	if recipe.Level > 0 && p.Level(player.SkillName(recipe.Skill)) < recipe.Level {
		sess.WriteLine(fmt.Sprintf("You need level %d %s to smelt that.", recipe.Level, recipe.Skill))
		return
	}

	for _, e := range recipe.Consume {
		for _, itemID := range e.Items {
			qty := e.Qty
			if qty <= 0 {
				qty = 1
			}
			if p.CountItem(itemID) < qty {
				def, _ := g.ItemStore.Load(itemID)
				name := itemID
				if def != nil {
					name = def.Name
				}
				sess.WriteLine(fmt.Sprintf("You need %d %s.", qty, name))
				return
			}
		}
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	g.consumeJunkCost(p, mod)

	for _, e := range recipe.Consume {
		for _, itemID := range e.Items {
			qty := e.Qty
			if qty <= 0 {
				qty = 1
			}
			p.RemoveItem(itemID, qty)
		}
	}

	outputQty := recipe.OutputQty
	if outputQty <= 0 {
		outputQty = 1
	}
	placed := false
	for i := 0; i < 28; i++ {
		slot := p.InvSlot(i)
		if slot != nil && slot.ItemID == recipe.Output {
			slot.Quantity += outputQty
			placed = true
			break
		}
	}
	if !placed {
		freeSlot := p.FirstFreeSlot()
		p.SetInvSlot(freeSlot, &player.InventorySlot{ItemID: recipe.Output, Quantity: outputQty})
	}

	sciXP := int(mod.BaseXP)
	if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
		sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d science! ***", p.Level(player.Science))))
	}
	if recipe.XP > 0 {
		if newLevel := p.AddSkillXP(player.SkillName(recipe.Skill), recipe.XP); newLevel > 0 {
			sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d %s! ***", p.Level(player.SkillName(recipe.Skill)), recipe.Skill)))
		}
	}
	g.AccountStore.SaveCharacter(p)

	outputDef, _ := g.ItemStore.Load(recipe.Output)
	outputName := recipe.Output
	if outputDef != nil {
		outputName = outputDef.Name
	}
	inputDef, _ := g.ItemStore.Load(inv.ItemID)
	inputName := inv.ItemID
	if inputDef != nil {
		inputName = inputDef.Name
	}

	sess.WriteLine(fmt.Sprintf("You superheat the %s and produce a %s.", inputName, outputName))
	if p.OptionBool("xp_drops") {
		parts := []string{fmt.Sprintf("+%dxp sci", sciXP)}
		if recipe.XP > 0 {
			parts = append(parts, fmt.Sprintf("+%dxp %s", recipe.XP, player.SkillAbbr[player.SkillName(recipe.Skill)]))
		}
		sess.WriteLine(g.colorize(sess, "xp", "("+strings.Join(parts, ", ")+")"))
	}
}

func (g *Game) triggerEnchant(sess *net.Session, p *player.Player, mod *ModDef, targetArg string) {
	if chipInfo, ok := chipMap[mod.ID]; ok {
		g.triggerChipBolts(sess, p, mod, chipInfo)
		return
	}

	enchants, ok := enchantMap[mod.ID]
	if !ok {
		sess.WriteLine("That enchantment has no known recipes.")
		return
	}

	if targetArg == "" {
		sess.WriteLine(fmt.Sprintf("Enchant what? Use: trigger %s <jewelry item>", strings.ReplaceAll(mod.ID, "_", " ")))
		return
	}

	slot, inv := g.findInventoryItem(p, targetArg)
	if slot < 0 {
		sess.WriteLine("You don't have that item.")
		return
	}

	outputID, ok := enchants[inv.ItemID]
	if !ok {
		sess.WriteLine("You can't enchant that with this mod.")
		return
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	g.consumeJunkCost(p, mod)

	inv.ItemID = outputID

	sciXP := int(mod.BaseXP)
	if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
		sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d science! ***", p.Level(player.Science))))
	}
	g.AccountStore.SaveCharacter(p)

	outputDef, _ := g.ItemStore.Load(outputID)
	outputName := outputID
	if outputDef != nil {
		outputName = outputDef.Name
	}
	inputDef, _ := g.ItemStore.Load(inv.ItemID)
	inputName := inv.ItemID
	if inputDef != nil {
		inputName = inputDef.Name
	}

	sess.WriteLine(fmt.Sprintf("You enchant the %s and it becomes a %s!", inputName, outputName))
	if p.OptionBool("xp_drops") {
		sess.WriteLine(g.colorize(sess, "xp", fmt.Sprintf("+%dxp sci", sciXP)))
	}
}

func (g *Game) triggerChipBolts(sess *net.Session, p *player.Player, mod *ModDef, chip chipEntry) {
	count := p.CountItem(chip.Input)
	if count < chip.Qty {
		inputDef, _ := g.ItemStore.Load(chip.Input)
		name := chip.Input
		if inputDef != nil {
			name = inputDef.Name
		}
		sess.WriteLine(fmt.Sprintf("You need at least %d %s.", chip.Qty, name))
		return
	}

	if p.Action != nil {
		g.CancelAction(p)
	}

	g.consumeJunkCost(p, mod)

	p.RemoveItem(chip.Input, chip.Qty)
	placed := false
	for i := 0; i < 28; i++ {
		slot := p.InvSlot(i)
		if slot != nil && slot.ItemID == chip.Output {
			slot.Quantity += chip.Qty
			placed = true
			break
		}
	}
	if !placed {
		freeSlot := p.FirstFreeSlot()
		p.SetInvSlot(freeSlot, &player.InventorySlot{ItemID: chip.Output, Quantity: chip.Qty})
	}

	sciXP := int(mod.BaseXP)
	if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
		sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d science! ***", p.Level(player.Science))))
	}
	g.AccountStore.SaveCharacter(p)

	inputDef, _ := g.ItemStore.Load(chip.Input)
	name := chip.Input
	if inputDef != nil {
		name = inputDef.Name
	}

	sess.WriteLine(fmt.Sprintf("You chip %d %s with arcane circuitry.", chip.Qty, name))
	if p.OptionBool("xp_drops") {
		sess.WriteLine(g.colorize(sess, "xp", fmt.Sprintf("+%dxp sci", sciXP)))
	}
}

func (g *Game) scienceAttack(sess *net.Session, p *player.Player, mob *world.MobInstance, mod *ModDef) bool {
	if p.Level(player.Science) < mod.Level {
		sess.WriteLine(fmt.Sprintf("You need level %d science to trigger %s.", mod.Level, mod.Name))
		return false
	}
	if !g.hasJunkCost(p, mod) {
		return false
	}

	if g.processConsumeQueue(p, sess) {
		p.ActionState = &ActionState{Type: ActionEating, TargetName: "food"}
		return true
	}

	g.consumeJunkCost(p, mod)

	equipSciBonus := g.totalEquipScienceAttack(p)
	attRoll := (p.Level(player.Science) + 8) * (equipSciBonus + 64)

	mobSciDef := mob.ScienceDefense
	defRoll := (mob.Defense + 9) * (mobSciDef + 64)

	if mob.Weakness == mod.Element {
		attRoll = attRoll * 13 / 10
	}

	if combat.HitCheck(attRoll, defRoll) {
		dmg := combat.RollDamage(mod.MaxHit)
		if dmg < 0 {
			dmg = 0
		}
		mob.HP -= dmg
		if mob.HP < 0 {
			mob.HP = 0
		}
		if mob.HP < mob.MaxHP && mob.HP > 0 {
			mob.StartRegen()
		}

		sciXP := int(mod.BaseXP)
		hpXP := int(mod.BaseXP * 0.33)
		var gains []xpGain
		var leveledUp []player.SkillName

		if newLevel := p.AddSkillXP(player.Science, sciXP); newLevel > 0 {
			leveledUp = append(leveledUp, player.Science)
		}
		gains = append(gains, xpGain{string(player.Science), sciXP})

		if newLevel := p.AddSkillXP(player.Hitpoints, hpXP); newLevel > 0 {
			leveledUp = append(leveledUp, player.Hitpoints)
		}
		gains = append(gains, xpGain{string(player.Hitpoints), hpXP})

		g.AccountStore.SaveCharacter(p)

		for _, skill := range leveledUp {
			sess.WriteLine(g.colorize(sess, "level_up", fmt.Sprintf("*** You are now level %d %s! ***", p.Level(skill), skill)))
		}

		mobName := mobDisplayName(mob, true)
		prefix := fmt.Sprintf("  %s hits %s for %s damage.",
			g.colorize(sess, "science_mod", mod.Name),
			g.colorize(sess, "mob_name", mobName),
			g.colorize(sess, "damage", fmt.Sprint(dmg)))
		hpPart := fmt.Sprintf("[%s/%dhp]", g.colorize(sess, "enemy_hp", fmt.Sprint(mob.HP)), mob.MaxHP)
		line := prefix + " " + hpPart
		if p.OptionBool("xp_drops") && len(gains) > 0 {
			var parts []string
			for _, gain := range gains {
				parts = append(parts, fmt.Sprintf("+%dxp %s", gain.XP, player.SkillAbbr[player.SkillName(gain.Skill)]))
			}
			line += g.colorize(sess, "xp", " ("+strings.Join(parts, ", ")+")")
		}
		sess.WriteLine(line)
	} else {
		sess.WriteLine(g.colorize(sess, "miss", fmt.Sprintf("  %s fails to connect.", mod.Name)))
	}
	return true
}

func (g *Game) findInventoryItem(p *player.Player, input string) (int, *player.InventorySlot) {
	lower := strings.ToLower(strings.TrimSpace(input))
	for i := 0; i < 28; i++ {
		slot := p.InvSlot(i)
		if slot == nil {
			continue
		}
		def, err := g.ItemStore.Load(slot.ItemID)
		if err != nil {
			continue
		}
		if def.MatchesName(lower) {
			return i, slot
		}
	}
	return -1, nil
}