package users

import (
	"dk/internal/store"
	"fmt"
	"slices"
	"sort"
	"strings"
	"time"

	"dk/internal/helpers"
)

// User represents a user in the game
type User struct {
	ID            int    `json:"id"`
	Username      string `json:"username"`
	Password      string `json:"password"`
	Email         string `json:"email"`
	Verified      int    `json:"verified"`
	Token         string `json:"token"`
	Registered    int64  `json:"registered"`
	LastOnline    int64  `json:"last_online"`
	Auth          int    `json:"auth"`
	X             int    `json:"x"`
	Y             int    `json:"y"`
	ClassID       int    `json:"class_id"`
	Currently     string `json:"currently"`
	Fighting      int    `json:"fighting"`
	MonsterID     int    `json:"monster_id"`
	MonsterHP     int    `json:"monster_hp"`
	MonsterSleep  int    `json:"monster_sleep"`
	MonsterImmune int    `json:"monster_immune"`
	UberDamage    int    `json:"uber_damage"`
	UberDefense   int    `json:"uber_defense"`
	HP            int    `json:"hp"`
	MP            int    `json:"mp"`
	TP            int    `json:"tp"`
	MaxHP         int    `json:"max_hp"`
	MaxMP         int    `json:"max_mp"`
	MaxTP         int    `json:"max_tp"`
	Level         int    `json:"level"`
	Gold          int    `json:"gold"`
	Exp           int    `json:"exp"`
	GoldBonus     int    `json:"gold_bonus"`
	ExpBonus      int    `json:"exp_bonus"`
	Strength      int    `json:"strength"`
	Dexterity     int    `json:"dexterity"`
	Attack        int    `json:"attack"`
	Defense       int    `json:"defense"`
	WeaponID      int    `json:"weapon_id"`
	ArmorID       int    `json:"armor_id"`
	ShieldID      int    `json:"shield_id"`
	Slot1ID       int    `json:"slot_1_id"`
	Slot2ID       int    `json:"slot_2_id"`
	Slot3ID       int    `json:"slot_3_id"`
	WeaponName    string `json:"weapon_name"`
	ArmorName     string `json:"armor_name"`
	ShieldName    string `json:"shield_name"`
	Slot1Name     string `json:"slot_1_name"`
	Slot2Name     string `json:"slot_2_name"`
	Slot3Name     string `json:"slot_3_name"`
	DropCode      int    `json:"drop_code"`
	Spells        string `json:"spells"`
	Towns         string `json:"towns"`
}

func (u *User) Save() error {
	return GetStore().UpdateWithRebuild(u.ID, u)
}

func (u *User) Delete() error {
	GetStore().RemoveWithRebuild(u.ID)
	return nil
}

func New() *User {
	now := time.Now().Unix()
	return &User{
		Verified:   0,
		Token:      "",
		Registered: now,
		LastOnline: now,
		Auth:       0,
		X:          0,
		Y:          0,
		ClassID:    1,
		Currently:  "In Town",
		Fighting:   0,
		HP:         10,
		MP:         10,
		TP:         10,
		MaxHP:      10,
		MaxMP:      10,
		MaxTP:      10,
		Level:      1,
		Gold:       100,
		Exp:        0,
		Strength:   0,
		Dexterity:  0,
		Attack:     0,
		Defense:    0,
		Spells:     "",
		Towns:      "",
	}
}

// Validate checks if user has valid values
func (u *User) Validate() error {
	if strings.TrimSpace(u.Username) == "" {
		return fmt.Errorf("user username cannot be empty")
	}
	if strings.TrimSpace(u.Email) == "" {
		return fmt.Errorf("user email cannot be empty")
	}
	if u.Registered <= 0 {
		return fmt.Errorf("user Registered timestamp must be positive")
	}
	if u.LastOnline <= 0 {
		return fmt.Errorf("user LastOnline timestamp must be positive")
	}
	if u.Level < 1 {
		return fmt.Errorf("user Level must be at least 1")
	}
	if u.HP < 0 {
		return fmt.Errorf("user HP cannot be negative")
	}
	if u.MaxHP < 1 {
		return fmt.Errorf("user MaxHP must be at least 1")
	}
	return nil
}

// UserStore with enhanced BaseStore
type UserStore struct {
	*store.BaseStore[User]
}

// Global store with singleton pattern
var GetStore = store.NewSingleton(func() *UserStore {
	us := &UserStore{BaseStore: store.NewBaseStore[User]()}

	// Register indices
	us.RegisterIndex("byUsername", store.BuildCaseInsensitiveLookupIndex(func(u *User) string {
		return u.Username
	}))

	us.RegisterIndex("byEmail", store.BuildStringLookupIndex(func(u *User) string {
		return u.Email
	}))

	us.RegisterIndex("byLevel", store.BuildIntGroupIndex(func(u *User) int {
		return u.Level
	}))

	us.RegisterIndex("allByRegistered", store.BuildSortedListIndex(func(a, b *User) bool {
		if a.Registered != b.Registered {
			return a.Registered > b.Registered // DESC
		}
		return a.ID > b.ID // DESC
	}))

	us.RegisterIndex("allByLevelExp", store.BuildSortedListIndex(func(a, b *User) bool {
		if a.Level != b.Level {
			return a.Level > b.Level // Level DESC
		}
		if a.Exp != b.Exp {
			return a.Exp > b.Exp // Exp DESC
		}
		return a.ID < b.ID // ID ASC
	}))

	return us
})

// Enhanced CRUD operations
func (us *UserStore) AddUser(user *User) error {
	return us.AddWithRebuild(user.ID, user)
}

func (us *UserStore) RemoveUser(id int) {
	us.RemoveWithRebuild(id)
}

func (us *UserStore) UpdateUser(user *User) error {
	return us.UpdateWithRebuild(user.ID, user)
}

// Data persistence
func LoadData(dataPath string) error {
	us := GetStore()
	return us.BaseStore.LoadData(dataPath)
}

func SaveData(dataPath string) error {
	us := GetStore()
	return us.BaseStore.SaveData(dataPath)
}

// Query functions using enhanced store
func Find(id int) (*User, error) {
	us := GetStore()
	user, exists := us.Find(id)
	if !exists {
		return nil, fmt.Errorf("user with ID %d not found", id)
	}
	return user, nil
}

func All() ([]*User, error) {
	us := GetStore()
	return us.AllSorted("allByRegistered"), nil
}

func ByUsername(username string) (*User, error) {
	us := GetStore()
	user, exists := us.LookupByIndex("byUsername", strings.ToLower(username))
	if !exists {
		return nil, fmt.Errorf("user with username '%s' not found", username)
	}
	return user, nil
}

func ByEmail(email string) (*User, error) {
	us := GetStore()
	user, exists := us.LookupByIndex("byEmail", email)
	if !exists {
		return nil, fmt.Errorf("user with email '%s' not found", email)
	}
	return user, nil
}

func ByLevel(level int) ([]*User, error) {
	us := GetStore()
	return us.GroupByIndex("byLevel", level), nil
}

func Online(within time.Duration) ([]*User, error) {
	us := GetStore()
	cutoff := time.Now().Add(-within).Unix()

	result := us.FilterByIndex("allByRegistered", func(u *User) bool {
		return u.LastOnline >= cutoff
	})

	// Sort by last_online DESC, then ID ASC
	sort.Slice(result, func(i, j int) bool {
		if result[i].LastOnline != result[j].LastOnline {
			return result[i].LastOnline > result[j].LastOnline // DESC
		}
		return result[i].ID < result[j].ID // ASC
	})

	return result, nil
}

// Insert with ID assignment
func (u *User) Insert() error {
	us := GetStore()
	if u.ID == 0 {
		u.ID = us.GetNextID()
	}
	return us.AddUser(u)
}

// Helper methods
func (u *User) RegisteredTime() time.Time {
	return time.Unix(u.Registered, 0)
}

func (u *User) LastOnlineTime() time.Time {
	return time.Unix(u.LastOnline, 0)
}

func (u *User) UpdateLastOnline() {
	u.LastOnline = time.Now().Unix()
}

func (u *User) IsVerified() bool {
	return u.Verified == 1
}

func (u *User) IsAdmin() bool {
	return u.Auth >= 4
}

func (u *User) IsModerator() bool {
	return u.Auth >= 3
}

func (u *User) IsFighting() bool {
	return u.Fighting == 1
}

func (u *User) IsAlive() bool {
	return u.HP > 0
}

func (u *User) GetSpellIDs() []int {
	return helpers.StringToInts(u.Spells)
}

func (u *User) SetSpellIDs(spells []int) {
	u.Spells = helpers.IntsToString(spells)
}

func (u *User) HasSpell(spellID int) bool {
	return slices.Contains(u.GetSpellIDs(), spellID)
}

func (u *User) GetTownIDs() []int {
	return helpers.StringToInts(u.Towns)
}

func (u *User) SetTownIDs(towns []int) {
	u.Towns = helpers.IntsToString(towns)
}

func (u *User) HasTownMap(townID int) bool {
	return slices.Contains(u.GetTownIDs(), townID)
}

func (u *User) GetEquipment() map[string]any {
	return map[string]any{
		"weapon": map[string]any{"id": u.WeaponID, "name": u.WeaponName},
		"armor":  map[string]any{"id": u.ArmorID, "name": u.ArmorName},
		"shield": map[string]any{"id": u.ShieldID, "name": u.ShieldName},
		"slot1":  map[string]any{"id": u.Slot1ID, "name": u.Slot1Name},
		"slot2":  map[string]any{"id": u.Slot2ID, "name": u.Slot2Name},
		"slot3":  map[string]any{"id": u.Slot3ID, "name": u.Slot3Name},
	}
}

func (u *User) GetStats() map[string]int {
	return map[string]int{
		"level":        u.Level,
		"hp":           u.HP,
		"mp":           u.MP,
		"tp":           u.TP,
		"max_hp":       u.MaxHP,
		"max_mp":       u.MaxMP,
		"max_tp":       u.MaxTP,
		"strength":     u.Strength,
		"dexterity":    u.Dexterity,
		"attack":       u.Attack,
		"defense":      u.Defense,
		"uber_damage":  u.UberDamage,
		"uber_defense": u.UberDefense,
	}
}

func (u *User) GetPosition() (int, int) {
	return u.X, u.Y
}

func (u *User) SetPosition(x, y int) {
	u.X = x
	u.Y = y
}