# Единый источник приоритетов
PRIORITY = [("0", "Low"), ("1", "Normal"), ("2", "High")]

# Коды стадий
STAGE_DRAFT = "draft"
STAGE_CONFIRMED = "confirmed"
STAGE_PLANNED = "planned"
STAGE_IN_PROGRESS = "in_progress"
STAGE_PAUSED = "paused"
STAGE_DONE = "done"
STAGE_CANCELLED = "cancelled"

# Единый словарь допустимых переходов стейт-машины
STAGE_TRANSITIONS = {
    STAGE_DRAFT: {STAGE_CONFIRMED, STAGE_PLANNED, STAGE_CANCELLED},
    STAGE_CONFIRMED: {STAGE_PLANNED, STAGE_IN_PROGRESS, STAGE_CANCELLED},
    STAGE_PLANNED: {STAGE_IN_PROGRESS, STAGE_CANCELLED},
    STAGE_IN_PROGRESS: {STAGE_PAUSED, STAGE_DONE},
    STAGE_PAUSED: {STAGE_IN_PROGRESS, STAGE_CANCELLED},
    STAGE_DONE: set(),
    STAGE_CANCELLED: set(),
}