// In file: internal/db/models.go
package db

import (
	"time"
	"go.mongodb.org/mongo-driver/bson/primitive"
)

// TrackedLink represents a file link in MongoDB.
type TrackedLink struct {
	ID             string    `bson:"_id,omitempty"` // MongoDB uses _id
	MessageID      int       `bson:"message_id"`
	UserID         int64     `bson:"user_id"`
	ShortHash      string    `bson:"short_hash"`
	FullHash       string    `bson:"full_hash"`
	LastRefreshedAt time.Time `bson:"last_refreshed_at"`
	CreatedAt      time.Time `bson:"created_at"`
}

type User struct {
	ID        primitive.ObjectID `bson:"_id,omitempty"`
	GoogleID  string             `bson:"google_id,unique"` // ID from the OAuth provider
	Email     string             `bson:"email,unique"`
	Name      string             `bson:"name"`
	AvatarURL string             `bson:"avatar_url"`
	TelegramID int64             `bson:"telegram_id,omitempty"` // The linked Telegram User ID
	CreatedAt time.Time          `bson:"created_at"`
	UpdatedAt time.Time          `bson:"updated_at"`
}

// OTPRequest stores a temporary one-time password for account linking.
type OTPRequest struct {
	ID        primitive.ObjectID `bson:"_id,omitempty"`
	UserID    primitive.ObjectID `bson:"user_id"` // Links to the User._id
	OTPHash   string             `bson:"otp_hash"`
	ExpiresAt time.Time          `bson:"expires_at"`
	CreatedAt time.Time          `bson:"created_at"`
}

// UserRecord represents a user from the 'users' collection.
// We only need the fields Go needs to interact with.
type UserRecord struct {
    ID          primitive.ObjectID `bson:"_id,omitempty"`
    TelegramID  int64              `bson:"telegram_id"`
}

type FileRecord struct {
    ID          primitive.ObjectID `bson:"_id,omitempty"`
    UserID      primitive.ObjectID `bson:"userId"`
    FolderID    *primitive.ObjectID `bson:"folderId,omitempty"` // Pointer to allow null
    MessageID   int                `bson:"messageId"`
    FileName    string             `bson:"fileName"`
    FileSize    int64              `bson:"fileSize"`
    MimeType    string             `bson:"mimeType"`
    ShortHash   string             `bson:"shortHash"`
    FullHash    string             `bson:"fullHash"`
    CreatedAt   time.Time          `bson:"createdAt"`
    UpdatedAt   time.Time          `bson:"updatedAt"`
}

// UserStats represents user usage statistics
type UserStats struct {
	ID            primitive.ObjectID `bson:"_id,omitempty"`
	UserID        int64              `bson:"user_id,unique"`
	FilesUploaded int64              `bson:"files_uploaded"`
	TotalSize     int64              `bson:"total_size"` // in bytes
	TotalDownloads int64             `bson:"total_downloads"`
	BandwidthUsed int64              `bson:"bandwidth_used"` // in bytes
	LastActive    time.Time          `bson:"last_active"`
	CreatedAt     time.Time          `bson:"created_at"`
	UpdatedAt     time.Time          `bson:"updated_at"`
	// Usage limits
	DailyLimit    int64              `bson:"daily_limit"`    // files per day
	MonthlyLimit  int64              `bson:"monthly_limit"`  // files per month
	Role          string             `bson:"role"`           // "basic", "premium", "admin"
}

// DailyUsage tracks daily usage per user
type DailyUsage struct {
	ID            primitive.ObjectID `bson:"_id,omitempty"`
	UserID        int64              `bson:"user_id"`
	Date          string             `bson:"date"` // YYYY-MM-DD format
	FilesCount    int                `bson:"files_count"`
	BandwidthUsed int64              `bson:"bandwidth_used"`
	CreatedAt     time.Time          `bson:"created_at"`
}

// UserSettings represents user preferences
type UserSettings struct {
	ID                  primitive.ObjectID `bson:"_id,omitempty"`
	UserID              int64              `bson:"user_id,unique"`
	DefaultExpiration   int                `bson:"default_expiration"` // hours, 0 = never
	EnableNotifications bool               `bson:"enable_notifications"`
	Theme               string             `bson:"theme"` // "light", "dark"
	Language            string             `bson:"language"`
	AutoDelete          bool               `bson:"auto_delete"` // auto delete after expiration
	CreatedAt           time.Time          `bson:"created_at"`
	UpdatedAt           time.Time          `bson:"updated_at"`
}

// FileHistory tracks user's file operations for history/search
type FileHistory struct {
	ID          primitive.ObjectID `bson:"_id,omitempty"`
	UserID      int64              `bson:"user_id"`
	MessageID   int                `bson:"message_id"`
	FileName    string             `bson:"file_name"`
	FileSize    int64              `bson:"file_size"`
	MimeType    string             `bson:"mime_type"`
	ShortHash   string             `bson:"short_hash"`
	FullHash    string             `bson:"full_hash"`
	DownloadCount int              `bson:"download_count"`
	LastAccessed  time.Time        `bson:"last_accessed"`
	CreatedAt     time.Time        `bson:"created_at"`
	ExpiresAt     *time.Time       `bson:"expires_at,omitempty"` // optional expiration
}

// UserBot represents a user's personal bot configuration
type UserBot struct {
	ID          primitive.ObjectID `bson:"_id,omitempty"`
	UserID      int64              `bson:"user_id,unique"`
	BotToken    string             `bson:"bot_token"`           // Encrypted bot token
	BotUsername string             `bson:"bot_username"`        // Bot username for display
	BotID       int64              `bson:"bot_id"`              // Bot's Telegram ID
	IsActive    bool               `bson:"is_active"`           // Whether bot is currently active
	IsVerified  bool               `bson:"is_verified"`         // Whether bot token was validated
	LastUsed    time.Time          `bson:"last_used"`           // Last time bot was used
	ErrorCount  int                `bson:"error_count"`         // Track consecutive errors
	LastError   string             `bson:"last_error,omitempty"` // Last error message
	CreatedAt   time.Time          `bson:"created_at"`
	UpdatedAt   time.Time          `bson:"updated_at"`
}

// UserRole constants
const (
	RoleBasic   = "basic"
	RolePremium = "premium"
	RoleAdmin   = "admin"
)

// Default limits per role
const (
	BasicDailyLimit    = 50
	BasicMonthlyLimit  = 1000
	PremiumDailyLimit  = 200
	PremiumMonthlyLimit = 5000
	AdminDailyLimit    = -1 // unlimited
	AdminMonthlyLimit  = -1 // unlimited
)