domain

type Category struct {
	ID       string `json:"id"`                 // unique identifier (UUID)
	Name     string `json:"name"`               // display name in library
	ParentID string `json:"parentId,omitempty"` // parent for nesting (empty if root)
	Icon     string `json:"icon,omitempty"`     // emoji for visual representation
}

type LanguageInfo struct {
	Key   string `json:"key"`   // identifier used in Text.Language
	Icon  string `json:"icon"`  // emoji for UI display
	Label string `json:"label"` // human-readable name
}

type SessionPayload struct {
	*SessionTextMeta

	Mistakes map[string]int `json:"mistakes"` // key → mistake count

	WPM      float64 `json:"wpm"`
	CPM      float64 `json:"cpm"`
	Accuracy float64 `json:"accuracy"`
	Duration float64 `json:"duration"` // seconds (approximation)

	StartTime int64 `json:"startTime"` // milliseconds since epoch
	EndTime   int64 `json:"endTime"`   // milliseconds since epoch

	TotalErrors     int `json:"totalErrors"`
	TotalKeystrokes int `json:"totalKeystrokes"`
}

type SessionRepository interface {
	Record(payload *SessionPayload) (TypingSession, error)
	List(limit int) ([]TypingSession, error)
}

type SessionTextMeta struct {
	Text       string `json:"text"`
	TextTitle  string `json:"textTitle"`
	CategoryID string `json:"categoryId"`
	TextID     string `json:"textId"`
}

type Settings struct {
	Theme          string `json:"theme"`          // "dark" | "light"
	LastTextID     string `json:"lastTextId"`     // last opened text ID for session restore
	KeyboardLayout string `json:"keyboardLayout"` // keyboard layout ID (e.g., "en-qwerty", "en-dvorak")
	ShowKeyboard   bool   `json:"showKeyboard"`   // keyboard section visibility
	ShowStatsBar   bool   `json:"showStatsBar"`   // stats bar visibility
	ZenMode        bool   `json:"zenMode"`        // focus mode (hides both keyboard and stats)
	StrictMode     bool   `json:"strictMode"`     // require backspace to fix errors (true) or allow direct correction (false)
}

type SettingsRepository interface {
	Load() (Settings, error)
	Save(s Settings) error
	Update(key string, value any) error
}

type Text struct {
	CreatedAt  time.Time `json:"createdAt"`  // when the text was added
	ID         string    `json:"id"`         // unique identifier (UUID)
	Title      string    `json:"title"`      // display name in library
	Content    string    `json:"content"`    // the actual text to type
	CategoryID string    `json:"categoryId"` // parent category (empty if root)
	Language   string    `json:"language"`   // tokenization rules: go, js, py, plain
	IsFavorite bool      `json:"isFavorite"` // user-pinned for quick access
}

type TextLibrary struct {
	DefaultTextID string     `json:"defaultTextId"` // text loaded on startup
	Categories    []Category `json:"categories"`    // flat list with ParentID refs
	Texts         []Text     `json:"texts"`         // metadata; content lazy-loaded
}

type TextRepository interface {
	Library() (TextLibrary, error)
	DefaultText() (Text, error)
	Text(id string) (Text, error)
	SaveText(text *Text) error
	UpdateText(text *Text) error
	DeleteText(id string) error
	SaveCategory(cat *Category) error
	DeleteCategory(id string) error
}

type TypingSession struct {
	StartedAt   time.Time      `json:"startedAt"`   // session start time (UTC)
	CompletedAt time.Time      `json:"completedAt"` // session end time (UTC)
	Mistakes    map[string]int `json:"mistakes,omitempty"`

	TextPreview string `json:"textPreview"` // excerpt from the source text
	TextTitle   string `json:"textTitle"`   // human readable label
	CategoryID  string `json:"categoryId,omitempty"`
	TextID      string `json:"textId,omitempty"` // optional reference to text catalog
	ID          string `json:"id"`               // stable identifier (UUID)

	WPM      float64 `json:"wpm"`
	CPM      float64 `json:"cpm"`
	Accuracy float64 `json:"accuracy"`

	DurationSeconds int `json:"durationSeconds"` // whole seconds spent typing
	TotalKeystrokes int `json:"totalKeystrokes"`
	TotalErrors     int `json:"totalErrors"`
	CharacterCount  int `json:"characterCount"`
}