package game

import (
	"fmt"
	"os"
	"strings"

	"thehouseoficarus/internal/net"
	"thehouseoficarus/internal/player"
)

func (g *Game) handleNewCharName(sess *net.Session, input string) {
	name := strings.TrimSpace(input)

	if sess.PendingChar == "connect" && len(sess.Account.Characters) > 0 {
		if idx, err := parseChoiceIndex(name); err == nil && idx > 0 && idx <= len(sess.Account.Characters) {
			sess.PendingChar = ""
			g.connectCharacter(sess, sess.Account.Characters[idx-1])
			return
		}
		sess.WriteLine("Invalid choice.")
		sess.Write("\n> ")
		return
	}

	if name == "" {
		sess.Write("Character name: ")
		return
	}

	if verr := player.ValidName(name); verr != nil {
		sess.WriteLine(verr.Error())
		sess.Write("Character name: ")
		return
	}

	if g.AccountStore.CharacterExists(name) {
		sess.WriteLine("A character with that name already exists.")
		sess.Write("Character name: ")
		return
	}

	p := player.New(name)
	p.RoomID = g.StartingRoom
	p.Stats.RecordRoomVisit(g.StartingRoom)

	if err := g.AccountStore.SaveCharacter(p); err != nil {
		sess.WriteLine(fmt.Sprintf("Error creating character: %v", err))
		sess.State = net.StateMenu
		g.showMenu(sess)
		return
	}

	acc, err := g.AccountStore.LoadAccount(sess.Account.Name)
	if err != nil {
		sess.WriteLine(fmt.Sprintf("Error creating character: %v", err))
		sess.State = net.StateMenu
		g.showMenu(sess)
		return
	}
	acc.Characters = append(acc.Characters, name)
	g.AccountStore.SaveAccount(acc)
	sess.Account.Characters = acc.Characters

	g.connectCharacter(sess, name)

	if sess.Player != nil {
		g.runEnterSteps(sess, sess.Player.RoomID)
	}
}

func (g *Game) connectCharacter(sess *net.Session, name string) {
	g.charsMu.Lock()
	if existing := g.loggedInChars[name]; existing != nil {
		g.charsMu.Unlock()
		sess.WriteLine("This character is logged in elsewhere.")
		sess.State = net.StateMenu
		g.showMenu(sess)
		return
	}

	p, err := g.AccountStore.LoadCharacter(name)
	if err != nil {
		g.charsMu.Unlock()
		sess.WriteLine(fmt.Sprintf("Error loading character: %v", err))
		sess.State = net.StateMenu
		g.showMenu(sess)
		return
	}

	sess.Player = p
	sess.State = net.StateGame
	g.loggedInChars[name] = sess
	g.charsMu.Unlock()

	if sess.Account != nil && sess.Account.Options != nil {
		p.Options = make(map[string]any)
		for k, v := range sess.Account.Options {
			p.Options[k] = v
		}
	}

	p.Stats.RecordRoomVisit(p.RoomID)
	g.World.SeedGroundItems(p.RoomID)
	g.seedRoomMobs(p.RoomID)
	g.seedRoomObjects(p.RoomID)

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

	g.doLook(sess)
	g.checkAggro(sess)

	// Resume an interrupted LOCKED trigger sequence saved across disconnect.
	g.resumePendingSequence(sess, p)

	sess.WritePrompt("> ")
}

func (g *Game) handleRenameChar(sess *net.Session, input string) {
	name := strings.TrimSpace(input)
	if idx, err := parseChoiceIndex(name); err == nil && idx > 0 && idx <= len(sess.Account.Characters) {
		sess.PendingChar = sess.Account.Characters[idx-1]
	} else {
		sess.PendingChar = name
	}

	found := false
	for _, c := range sess.Account.Characters {
		if c == sess.PendingChar {
			found = true
			break
		}
	}
	if !found {
		sess.WriteLine(fmt.Sprintf("No character named %s on this account.", sess.PendingChar))
		g.showMenu(sess)
		return
	}

	sess.State = net.StateRenameCharName
	sess.WriteLine(fmt.Sprintf("Renaming %s.", sess.PendingChar))
	sess.Write("New name: ")
}

func (g *Game) handleRenameCharName(sess *net.Session, input string) {
	newName := strings.TrimSpace(input)
	oldName := sess.PendingChar
	if newName == "" {
		sess.Write("New name: ")
		return
	}
	if verr := player.ValidName(newName); verr != nil {
		sess.WriteLine(verr.Error())
		sess.Write("New name: ")
		return
	}
	if newName == oldName {
		sess.WriteLine("That's already the character's name.")
		g.showMenu(sess)
		return
	}
	if g.AccountStore.CharacterExists(newName) {
		sess.WriteLine("A character with that name already exists.")
		sess.Write("New name: ")
		return
	}

	oldPath := g.AccountStore.CharPath(oldName)
	newPath := g.AccountStore.CharPath(newName)
	if err := os.Rename(oldPath, newPath); err != nil {
		sess.WriteLine(fmt.Sprintf("Error renaming: %v", err))
		g.showMenu(sess)
		return
	}

	p, _ := g.AccountStore.LoadCharacter(newName)
	if p != nil {
		p.Name = newName
		g.AccountStore.SaveCharacter(p)
	}

	acc, err := g.AccountStore.LoadAccount(sess.Account.Name)
	if err != nil {
		sess.WriteLine(fmt.Sprintf("Error renaming: %v", err))
		g.showMenu(sess)
		return
	}
	for i, c := range acc.Characters {
		if c == oldName {
			acc.Characters[i] = newName
			break
		}
	}
	g.AccountStore.SaveAccount(acc)
	sess.Account.Characters = acc.Characters

	sess.PendingChar = ""
	sess.WriteLine(fmt.Sprintf("%s renamed to %s.", oldName, newName))
	g.showMenu(sess)
}

func (g *Game) showDeleteConfirm(sess *net.Session) {
	sess.State = net.StateDeleteChar
	sess.WriteLine(fmt.Sprintf("\nDelete %s? Type DELETE %s to confirm, or anything else to cancel.", sess.PendingChar, sess.PendingChar))
}

func (g *Game) handleDeleteChar(sess *net.Session, input string) {
	if sess.PendingChar == "" {
		name := strings.TrimSpace(input)
		if idx, err := parseChoiceIndex(name); err == nil && idx > 0 && idx <= len(sess.Account.Characters) {
			sess.PendingChar = sess.Account.Characters[idx-1]
		} else {
			sess.PendingChar = name
		}
		found := false
		for _, c := range sess.Account.Characters {
			if c == sess.PendingChar {
				found = true
				break
			}
		}
		if !found {
			sess.WriteLine(fmt.Sprintf("No character named %s on this account.", sess.PendingChar))
			sess.PendingChar = ""
			g.showMenu(sess)
			return
		}
		g.showDeleteConfirm(sess)
		return
	}

	input = strings.TrimSpace(input)
	expected := "DELETE " + sess.PendingChar
	if strings.ToUpper(input) != strings.ToUpper(expected) {
		sess.WriteLine("Delete cancelled.")
		sess.PendingChar = ""
		g.showMenu(sess)
		return
	}

	charPath := g.AccountStore.CharPath(sess.PendingChar)
	if err := os.Remove(charPath); err != nil {
		sess.WriteLine(fmt.Sprintf("Error deleting: %v", err))
		sess.PendingChar = ""
		g.showMenu(sess)
		return
	}

	acc, err := g.AccountStore.LoadAccount(sess.Account.Name)
	if err != nil {
		sess.WriteLine(fmt.Sprintf("Error deleting: %v", err))
		sess.PendingChar = ""
		g.showMenu(sess)
		return
	}
	var newChars []string
	for _, c := range acc.Characters {
		if c != sess.PendingChar {
			newChars = append(newChars, c)
		}
	}
	acc.Characters = newChars
	g.AccountStore.SaveAccount(acc)
	sess.Account.Characters = newChars

	sess.WriteLine(fmt.Sprintf("%s has been deleted.", sess.PendingChar))
	sess.PendingChar = ""
	g.showMenu(sess)
}