package entity

import (
	"time"

	"gorm.io/gorm"
)

// UserRole 用户角色枚举
type UserRole string

const (
	UserRoleUser         UserRole = "user"
	UserRoleAdmin        UserRole = "admin"
	UserRolePhotographer UserRole = "photographer"
)

// User 用户实体
type User struct {
	ID            uint           `json:"id" gorm:"primarykey"`
	Username      string         `json:"username" gorm:"uniqueIndex;not null;size:50"`
	Email         string         `json:"email" gorm:"uniqueIndex;not null;size:100"`
	Password      string         `json:"-" gorm:"not null;size:255"`
	Name          string         `json:"name" gorm:"size:100"`
	Avatar        string         `json:"avatar" gorm:"size:500"`
	Bio           string         `json:"bio" gorm:"type:text"`
	Website       string         `json:"website" gorm:"size:200"`
	Location      string         `json:"location" gorm:"size:100"`
	Role          UserRole       `json:"role" gorm:"default:user;size:20"`
	IsActive      bool           `json:"is_active" gorm:"default:true"`
	IsPublic      bool           `json:"is_public" gorm:"default:true"`
	EmailVerified bool           `json:"email_verified" gorm:"default:false"`
	LastLogin     *time.Time     `json:"last_login"`
	LoginCount    int            `json:"login_count" gorm:"default:0"`
	CreatedAt     time.Time      `json:"created_at"`
	UpdatedAt     time.Time      `json:"updated_at"`
	DeletedAt     gorm.DeletedAt `json:"deleted_at" gorm:"index"`

	// 关联
	Photos []Photo `json:"photos,omitempty" gorm:"foreignKey:UserID"`
	Albums []Album `json:"albums,omitempty" gorm:"foreignKey:UserID"`
}

// TableName 指定表名
func (User) TableName() string {
	return "users"
}

// IsAdmin 检查是否为管理员
func (u *User) IsAdmin() bool {
	return u.Role == UserRoleAdmin
}

// IsPhotographer 检查是否为摄影师
func (u *User) IsPhotographer() bool {
	return u.Role == UserRolePhotographer || u.Role == UserRoleAdmin
}

// CanManagePhoto 检查是否可以管理指定照片
func (u *User) CanManagePhoto(photo *Photo) bool {
	return u.ID == photo.UserID || u.IsAdmin()
}

// CanManageAlbum 检查是否可以管理指定相册
func (u *User) CanManageAlbum(album *Album) bool {
	return u.ID == album.UserID || u.IsAdmin()
}

// UserStats 用户统计信息
type UserStats struct {
	Total     int64            `json:"total"`      // 总用户数
	Active    int64            `json:"active"`     // 活跃用户数
	ThisMonth int64            `json:"this_month"` // 本月新增
	Today     int64            `json:"today"`      // 今日新增
	RoleStats map[string]int64 `json:"role_stats"` // 角色统计
}

// CreateUserRequest 创建用户请求
type CreateUserRequest struct {
	Username string   `json:"username" binding:"required,min=3,max=50"`
	Email    string   `json:"email" binding:"required,email"`
	Password string   `json:"password" binding:"required,min=6"`
	Name     string   `json:"name" binding:"max=100"`
	Role     UserRole `json:"role" binding:"oneof=user admin photographer"`
}

// UpdateUserRequest 更新用户请求
type UpdateUserRequest struct {
	Username *string   `json:"username" binding:"omitempty,min=3,max=50"`
	Email    *string   `json:"email" binding:"omitempty,email"`
	Name     *string   `json:"name" binding:"omitempty,max=100"`
	Avatar   *string   `json:"avatar" binding:"omitempty,max=500"`
	Bio      *string   `json:"bio" binding:"omitempty,max=1000"`
	Website  *string   `json:"website" binding:"omitempty,max=200"`
	Location *string   `json:"location" binding:"omitempty,max=100"`
	Role     *UserRole `json:"role" binding:"omitempty,oneof=user admin photographer"`
	IsActive *bool     `json:"is_active"`
}

// UpdateCurrentUserRequest 更新当前用户请求
type UpdateCurrentUserRequest struct {
	Username *string `json:"username" binding:"omitempty,min=3,max=50"`
	Email    *string `json:"email" binding:"omitempty,email"`
	Name     *string `json:"name" binding:"omitempty,max=100"`
	Avatar   *string `json:"avatar" binding:"omitempty,max=500"`
	Bio      *string `json:"bio" binding:"omitempty,max=1000"`
	Website  *string `json:"website" binding:"omitempty,max=200"`
	Location *string `json:"location" binding:"omitempty,max=100"`
}

// ChangePasswordRequest 修改密码请求
type ChangePasswordRequest struct {
	OldPassword string `json:"old_password" binding:"required"`
	NewPassword string `json:"new_password" binding:"required,min=6"`
}

// UserStatus 用户状态
type UserStatus string

const (
	UserStatusActive   UserStatus = "active"
	UserStatusInactive UserStatus = "inactive" 
	UserStatusBanned   UserStatus = "banned"
	UserStatusPending  UserStatus = "pending"
)

// UserListParams 用户列表查询参数
type UserListParams struct {
	Page           int         `json:"page"`
	Limit          int         `json:"limit"`
	Sort           string      `json:"sort"`
	Order          string      `json:"order"`
	Role           *UserRole   `json:"role"`
	Status         *UserStatus `json:"status"`
	Search         string      `json:"search"`
	CreatedFrom    *time.Time  `json:"created_from"`
	CreatedTo      *time.Time  `json:"created_to"`
	LastLoginFrom  *time.Time  `json:"last_login_from"`
	LastLoginTo    *time.Time  `json:"last_login_to"`
}

// UserGlobalStats 全局用户统计信息
type UserGlobalStats struct {
	Total               int64 `json:"total"`
	Active              int64 `json:"active"`
	Admins              int64 `json:"admins"`
	Editors             int64 `json:"editors"`
	Users               int64 `json:"users"`
	MonthlyRegistrations int64 `json:"monthly_registrations"`
}