package types

import (
	"crypto/sha256"
	"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"`
	Avatar       string                    `json:"avatar"`
	ProfileBg    string                    `json:"profileBackground"`
	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 NewConnection() *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 RolePermission uint32

const (
	// Hub permissions
	PermissionSetHubName RolePermission = iota
	PermissionSetHubBg
	PermissionSetHubColor
	PermissionRemoveHub
	PermissionSetUserColorAllowed

	// User permissions
	PermissionAddUser
	PermissionRemoveUser
	PermissionRenameUser
	PermissionMuteUser

	// Role permissions
	PermissionAddRole
	PermissionRemoveRole
	PermissionChangeRoleName
	PermissionChangeRoleColor
	PermissionChangeRolePermissions
	PermissionOnlySelfRoleRemove

	// Channel group permissions
	PermissionAddChannelGroup
	PermissionRemoveChannelGroup
	PermissionSetChannelGroupName
	PermissionSetChannelGroupColor
	PermissionSetChannelGroupPermittedVisibleRoles

	// Channel permissions
	PermissionAddChannel
	PermissionRemoveChannel
	PermissionSetChannelName
	PermissionSetChannelPermittedVisibleRoles
	PermissionSetChannelPermittedSendMessageRoles
	PermissionSetChannelPermittedReadHistoryRoles
)

type Hub struct {
	Mu             sync.RWMutex           `json:"-"`
	Id             uuid.UUID              `json:"id"`
	CreatedAt      time.Time              `json:"createdAt"`
	MessagesBuff   []*Message             `json:"-"`
	NextBuffIdx    uint32                 `json:"-"`
	HaveOverflowed bool                   `json:"-"`
	Users          map[uuid.UUID]*HubUser `json:"-"`
	Roles          map[uint8]*HubRole     `json:"-"`
	Creator        uuid.UUID              `json:"creator"`
	Name           string                 `json:"name"`
	Color          Rgba                   `json:"color"`
	AllowUserColor bool                   `json:"allowUserColor"`
}

func NewHub() *Hub {
	return &Hub{
		MessagesBuff: make([]*Message, config.MaxHubMsgCache),
		Users:        make(map[uuid.UUID]*HubUser),
		Roles:        make(map[uint8]*HubRole),
	}
}

type HubChannelGroup struct {
	Id    uuid.UUID `json:"id"`
	Name  string    `json:"name"`
	Color Rgba      `json:"color"`
}

type HubChannel struct {
	Id            uuid.UUID `json:"id"`
	Name          uuid.UUID `json:"name"`
	ParentGroupId uuid.UUID `json:"parentGroupId"`
}

type HubUser struct {
	Id        uuid.UUID `json:"id"`
	Username  string    `json:"username"`
	Roles     []uint8   `json:"roles"`
	CreatedAt time.Time `json:"createdAt"`
}

type HubRole struct {
	Name           string         `json:"role"`
	Id             uint8          `json:"id"`
	RolePermission RolePermission `json:"rolePermission"`
	Color          Rgba           `json:"color"`
}

func (h HubRole) GrantPermission(r RolePermission) {
	h.RolePermission |= r
}
func (h HubRole) GrantPermissions(rs []RolePermission) {
	for _, r := range rs {
		h.RolePermission |= r
	}
}
func (h HubRole) RevokePermission(r RolePermission) {
	h.RolePermission &^= r
}
func (h HubRole) RevokePermissions(rs []RolePermission) {
	for _, r := range rs {
		h.RolePermission &^= r
	}
}
func (h HubRole) HasPermission(r RolePermission) bool {
	return h.RolePermission&r != 0
}