package types

import (
	"crypto/sha256"
	"math"
	"math/rand/v2"
	"sync"
	"time"

	"go-socket/packages/Enums/ConnectionState"
	"go-socket/packages/Enums/WsEventType"
	"go-socket/packages/config"

	"github.com/coder/websocket"
	"github.com/google/uuid"
)

type Rgba [4]uint8
type Sha256Hash [sha256.Size]byte

func (r Rgba) GetRandom() Rgba {
	for i := range r {
		r[i] = uint8(rand.IntN(256))
	}
	return r
}

type User struct {
	Mu           sync.RWMutex              `json:"-"`
	Name         string                    `json:"name"`
	Pronouns     string                    `json:"pronouns"`
	Description  string                    `json:"description"`
	AvatarUrl    string                    `json:"avatarUrl"`
	ProfileBgUrl string                    `json:"profileBackgroundUrl"`
	PasswordHash string                    `json:"-"`
	CreatedAt    time.Time                 `json:"createdAt"`
	WsConn       *websocket.Conn           `json:"-"`
	Id           uuid.UUID                 `json:"-"`
	Connections  map[uuid.UUID]*Connection `json:"-"`
	Color        Rgba                      `json:"color"`
}

type UserProfileUpdateList struct {
	Pronouns    bool
	Description bool
	Color       bool
	Avatar      bool
	ProfileBg   bool
}

type Connection struct {
	Mu                   sync.RWMutex                    `json:"-"`
	Id                   uuid.UUID                       `json:"id"`
	CreatedAt            time.Time                       `json:"createdAt"`
	MessagesBuff         []*Message                      `json:"-"`
	NextBuffIdx          uint32                          `json:"-"`
	RequestorId          uuid.UUID                       `json:"requestorId"`
	RecipientId          uuid.UUID                       `json:"recipientId"`
	UserWantingToElevate uuid.UUID                       `json:"userWantingToElevate"` // TODO add to database
	HaveOverflowed       bool                            `json:"-"`
	State                ConnectionState.ConnectionState `json:"state"`
}

func NewConn() *Connection {
	return &Connection{
		MessagesBuff: make([]*Message, config.MaxDirectMsgCache),
	}
}
func (conn *Connection) AddMessageToBuff(message *Message) {
	conn.Mu.Lock()
	defer conn.Mu.Unlock()

	size := uint32(len(conn.MessagesBuff))
	conn.MessagesBuff[conn.NextBuffIdx%size] = message
	conn.NextBuffIdx++
	if conn.NextBuffIdx >= size {
		conn.HaveOverflowed = true
	}
}

// GetSortedMessagesBuff returns slice and its valid length.
func (conn *Connection) GetSortedMessagesBuff() ([]*Message, uint32) {
	conn.Mu.RLock()
	defer conn.Mu.RUnlock()

	size := uint32(len(conn.MessagesBuff))
	if !conn.HaveOverflowed {
		return conn.MessagesBuff, conn.NextBuffIdx
	}

	sorted := make([]*Message, size)
	for i := uint32(0); i < size; i++ {
		sorted[i] = conn.MessagesBuff[(conn.NextBuffIdx+i)%size]
	}
	return sorted, size
}

type ConnectionStatusSetData struct {
	Id       uuid.UUID                       `json:"id"`
	NewState ConnectionState.ConnectionState `json:"newState"`
}

type Message struct {
	Id           uuid.UUID `json:"id"`
	AttachedFile string    `json:"attachedFile"`
	Content      string    `json:"content"`
	CreatedAt    time.Time `json:"createdAt"`
	Sender       uuid.UUID `json:"sender"`
	Receiver     uuid.UUID `json:"receiver"`
}

type LoginReturn struct {
	Token  string    `json:"token"`
	UserId uuid.UUID `json:"userId"`
}

type WsEventMessage struct {
	Type  WsEventType.WsEventType `json:"type"`
	Event any                     `json:"event"`
}

type WsAuthMessage struct {
	Success bool   `json:"success"`
	Error   string `json:"error"`
}

type Permissions uint32

const (
	// Hub permissions
	PermissionSetHubName Permissions = 1 << iota
	PermissionSetHubIcon
	PermissionSetHubBg
	PermissionSetHubColor
	PermissionRemoveHub
	PermissionSetUserColorAllowed

	// User permissions
	PermissionAddUser
	PermissionRemoveUser
	PermissionRenameUser
	PermissionMuteUser

	// Role permissions
	PermissionAddRole
	PermissionRemoveRole
	PermissionChangeRoleName
	PermissionChangeRoleColor
	PermissionChangeRoleGlobals

	PermissionNoSelfRoleRemove
	PermissionOnlySelfRoleRemove

	// Channel group permissions
	PermissionAddChannelGroup
	PermissionRemoveChannelGroup
	PermissionSetChannelGroupName
	PermissionSetChannelGroupColor
	PermissionSetChannelGroupPermittedVisibleRoles

	// Channel permissions
	PermissionAddChannel
	PermissionRemoveChannel
	PermissionSetChannelName
	PermissionSetChannelIcon
	PermissionSetChannelPermittedVisibleRoles
	PermissionSetChannelPermittedSendMessageRoles
	PermissionSetChannelPermittedReadHistoryRoles
)

func (p *Permissions) Grant(permissions Permissions) {
	*p |= permissions
}
func (p *Permissions) GrantMultiple(perms []Permissions) {
	for _, perm := range perms {
		*p |= perm
	}
}
func (p *Permissions) Revoke(permissions Permissions) {
	*p &^= permissions
}
func (p *Permissions) Has(permissions Permissions) bool {
	return *p&permissions != 0
}

func PermissionAll() Permissions {
	return math.MaxUint32
}

type BoundRoles uint64

func (b *BoundRoles) Add(id uint8) {
	*b |= 1 << id
}
func (b *BoundRoles) Remove(id uint8) {
	*b &^= 1 << id
}
func (b *BoundRoles) Has(id uint8) bool {
	return *b&(1<<id) != 0
}

type Hub struct {
	Mu               sync.RWMutex              `json:"-"`
	CreatedAt        time.Time                 `json:"createdAt"`
	Roles            [256]*HubRole             `json:"-"`
	Users            [256]*HubUser             `json:"-"`
	Groups           [256]*HubGroup            `json:"-"`
	Channels         map[uuid.UUID]*HubChannel `json:"-"`
	Name             string                    `json:"name"`
	IconUrl          string                    `json:"iconUrl"`
	BgUrl            string                    `json:"backgroundUrl"`
	JoinRole         *HubRole                  `json:"joinRole"`
	Id               uuid.UUID                 `json:"id"`
	Creator          uuid.UUID                 `json:"creator"`
	Color            Rgba                      `json:"color"`
	UserColorAllowed bool                      `json:"userColorAllowed"`
}

func NewHub() *Hub {
	return &Hub{
		Channels: make(map[uuid.UUID]*HubChannel),
	}
}

type HubRole struct {
	Name         string      `json:"role"`
	CreatedAt    time.Time   `json:"createdAt"`
	Permissions  Permissions `json:"permissions"`
	Color        Rgba        `json:"color"`
	Id           uint8       `json:"id"`
	BoundedGroup uint8       `json:"boundedGroup"` // BoundedGroup 0 for global
}

func (h *HubRole) GrantPermission(r Permissions) {
	h.Permissions |= r
}
func (h *HubRole) RevokePermission(r Permissions) {
	h.Permissions &^= r
}
func (h *HubRole) HasPermission(r Permissions) bool {
	return h.Permissions&r != 0
}

type HubGroup struct {
	Name         string     `json:"name"`
	CreatedAt    time.Time  `json:"createdAt"`
	Color        Rgba       `json:"color"`
	RolesCanView BoundRoles `json:"rolesCanView"`
	Id           uint8      `json:"id"` // Id 0 for unused
}

func NewHubGroup() *HubGroup {
	return &HubGroup{}
}

type HubUser struct {
	Mu         sync.RWMutex `json:"mu"`
	CreatedAt  time.Time    `json:"createdAt"`
	Roles      BoundRoles   `json:"-"`
	Name       string       `json:"name"`
	OriginalId uuid.UUID    `json:"originalId"`
	IsMuted    bool         `json:"isMuted"`
}

func NewHubUser() *HubUser {
	return &HubUser{}
}

type HubChannel struct {
	Mu                  sync.RWMutex `json:"-"`
	MessagesBuff        []*Message   `json:"-"`
	Name                string       `json:"name"`
	Description         string       `json:"description"`
	IconUrl             string       `json:"iconUrl"`
	CreatedAt           time.Time    `json:"createdAt"`
	RolesCanView        BoundRoles   `json:"rolesCanView"`
	RolesCanMessage     BoundRoles   `json:"rolesCanMessage"`
	RolesCanReadHistory BoundRoles   `json:"rolesCanReadHistory"`
	NextBuffIdx         uint32       `json:"-"`
	Id                  uuid.UUID    `json:"id"`
	ParentId            uint8        `json:"parentId"`
	Position            uint8        `json:"position"`
	HaveOverflowed      bool         `json:"-"`
}

func NewHubChannel() *HubChannel {
	return &HubChannel{
		MessagesBuff: make([]*Message, config.MaxHubChannelMsgCache),
	}
}
func (conn *HubChannel) AddMessageToBuff(message *Message) {
	conn.Mu.Lock()
	defer conn.Mu.Unlock()

	size := uint32(len(conn.MessagesBuff))
	conn.MessagesBuff[conn.NextBuffIdx%size] = message
	conn.NextBuffIdx++
	if conn.NextBuffIdx >= size {
		conn.HaveOverflowed = true
	}
}

// GetSortedMessagesBuff returns slice and its valid length.
func (conn *HubChannel) GetSortedMessagesBuff() ([]*Message, uint32) {
	conn.Mu.RLock()
	defer conn.Mu.RUnlock()

	size := uint32(len(conn.MessagesBuff))
	if !conn.HaveOverflowed {
		return conn.MessagesBuff, conn.NextBuffIdx
	}

	sorted := make([]*Message, size)
	for i := uint32(0); i < size; i++ {
		sorted[i] = conn.MessagesBuff[(conn.NextBuffIdx+i)%size]
	}
	return sorted, size
}