# Constraints beyond required and unique: bounds on values, assertions across
# properties, and a raw SHACL fragment for the long tail.
lpg: "1.0"
namespace:
  prefix: bk
  iri: https://example.org/vocab/booking#

enums:
  Status:
    id: x_bst
    values: [held, confirmed, cancelled]

nodes:
  Guest:
    id: n_guest
    key: [email]
    props:
      email: { id: p_gmail, type: string, unique: true, pattern: "^[^@]+@[^@]+$" }
      phone: { id: p_gphone, type: string, minLength: 7, maxLength: 20 }
      age:   { id: p_gage, type: int, min: 0, max: 130 }
    constraints:
      - id: c_reach
        name: reachable
        assert: { atLeastOne: [email, phone] }
        message: a guest needs an email address or a phone number

  Booking:
    id: n_bkg
    key: [ref]
    props:
      ref:       { id: p_bref, type: string, required: true, pattern: "^BK-[0-9]{6}$" }
      status:    { id: p_bst, type: string, enum: Status }
      startDate: { id: p_bs, type: date, required: true }
      endDate:   { id: p_be, type: date, required: true }
      nights:    { id: p_bn, type: int, min: 1, max: 30 }
    constraints:
      - id: c_dates
        name: endAfterStart
        assert: { lessThan: [startDate, endDate] }
        message: a booking must end after it starts
      - id: c_lead
        name: oneLeadGuest
        assert: { count: { edge: BOOKED_BY, of: Guest, min: 1, max: 1 } }
        message: exactly one guest leads a booking

    # The escape hatch: anything the closed vocabulary cannot say is written as raw
    # SHACL and spliced into this shape. Only the shacl target can use it, and every
    # other target reports that it ignored it.
    shacl: |
      sh:property [
        sh:path bk:nights ;
        sh:severity sh:Warning ;
        sh:description "long stays are reviewed by hand" ;
        sh:maxInclusive 14 ;
      ] ;

edges:
  BOOKED_BY:
    id: e_by
    from: Booking
    to: Guest
    cardinality: { to: "1..*" }