package models

import "time"

// UploadCategory groups file types for the admin UI.
const (
	CategoryImage    = "image"
	CategoryDocument = "document"
	CategoryArchive  = "archive"
	CategoryVideo    = "video"
	CategoryOther    = "other"
)

// DefaultUploadMaxSize is the default per-file size limit (10 MiB), in bytes.
const DefaultUploadMaxSize int64 = 10 * 1024 * 1024

// UploadConfig holds the singleton (id=1) global attachment upload policy.
type UploadConfig struct {
	ID              uint      `gorm:"primarykey" json:"id"`
	Enabled         bool      `gorm:"default:true" json:"enabled"`                 // master switch for attachment uploads
	DefaultMaxSize  int64     `gorm:"default:10485760" json:"default_max_size"`    // bytes; overridden per type by UploadFileType.MaxSize
	StorageDir      string    `gorm:"size:255;default:attachments" json:"storage_dir"` // sub-dir under cfg.Path
	UpdatedBy       uint      `gorm:"index" json:"updated_by"`
	UpdatedAt       time.Time `json:"updated_at"`
}

// TableName overrides the default GORM table name.
func (UploadConfig) TableName() string {
	return "upload_configs"
}

// UploadFileType describes one permitted attachment extension. Multiple rows.
type UploadFileType struct {
	ID        uint   `gorm:"primarykey" json:"id"`
	Extension string `gorm:"size:32;uniqueIndex" json:"extension"` // with leading dot, e.g. ".pdf"
	MimeType  string `gorm:"size:128" json:"mime_type"`             // associated MIME for validation
	Category  string `gorm:"size:32;index" json:"category"`         // image/document/archive/video/other
	MaxSize   int64  `gorm:"default:0" json:"max_size"`              // bytes; 0 means use UploadConfig.DefaultMaxSize
	Enabled   bool   `gorm:"default:true" json:"enabled"`
	Sort      int    `gorm:"default:0" json:"sort"`
}

// TableName overrides the default GORM table name.
func (UploadFileType) TableName() string {
	return "upload_file_types"
}

// EffectiveMaxSize returns the per-file size limit for this type, falling back
// to the provided default when MaxSize is 0.
func (t *UploadFileType) EffectiveMaxSize(def int64) int64 {
	if t.MaxSize > 0 {
		return t.MaxSize
	}
	return def
}

// DownloadBaseURL is one source base URL used to build attachment download
// links. Multiple rows; the row marked IsDefault (or the highest-priority
// enabled one) is used for generated links.
type DownloadBaseURL struct {
	ID        uint      `gorm:"primarykey" json:"id"`
	Name      string    `gorm:"size:64" json:"name"`       // label, e.g. "主站" / "CDN"
	BaseURL   string    `gorm:"size:512" json:"base_url"`  // e.g. https://cdn.example.com/uploads
	Priority  int       `gorm:"default:0" json:"priority"` // lower = higher priority
	IsDefault bool      `gorm:"default:false" json:"is_default"`
	Enabled   bool      `gorm:"default:true" json:"enabled"`
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}

// TableName overrides the default GORM table name.
func (DownloadBaseURL) TableName() string {
	return "download_baseurls"
}