version: "1"  # version schema used of meta spec


spec:  # metadata
  uuid:
  vendor: IETF
  name: RFC5545
  version: RFC5545  # TODO maybe choose different or remove (may be encoded inside name)


components:

  - name: VCALENDAR
    root: true
    properties:
      - name: PRODID
        required: true
      - name: VERSION
        required: true
      - name: CALSCALE
      - name: METHOD
    components:
      - name: VEVENT
      - name: VTODO
      - name: VJOURNAL
      - name: VFREEBUSY
      - name: VTIMEZONE

  - template: true
    name: object
    properties:
      # required, also with method  (TODO)
      - name: DTSTAMP
        required: true
        required_for_transaction: true
      - name: UID
        required: true
        required_for_transaction: true

  - template: true
    name: descriptive object
    properties:
      # optional, must once
      - name: CLASS
      - name: CREATED
      - name: DESCRIPTION
      - name: GEO  # TODO remove from journal
      - name: LAST-MODIFIED
      - name: LOCATION  # TODO remove from journal
      - name: organizer
      - name: priority  # TODO remove from journal
      - name: seq
      - name: status  # TODO differ between event/todo/journal
      - name: summary
      - name: url
      # TODO multiple
      - name: ATTACH
      - name: ATTENDEE
      - name: CATEGORIES
      - name: COMMENT
      - name: CONTACT
      - name: EXDATE
      - name: RELATED
      - name: RESOURCES

  - template: true
    name: durated object
    properties:
      # required
      - name: DTSTART
        required: true
      # TODO exclude each other
      - name: DTEND
      - name: DURATION

  - template: true
    name: recurrent object
    properties:
      # optional, must once
      - name: recurid
      # optional, should once; TODO may multiple
      - name: RRULE

  - name: VEVENT
    includes_templates:
      - object
      - descriptive object
      - durated object
      - recurrent object
    properties:
      # optional, must once
      - name: transp
      # TODO multiple
      # TODO shared between event & todo
      - name: RSTATUS
      - name: RDATE
    components:
      - name: VALARM

  - name: VTODO
    includes_templates:
      - object
      - descriptive object
      - durated object
      - recurrent object
    properties:
      # optional, must once
      - completed
      - PERCENT-COMPLETE
      - due
      - duration
      # TODO shared between event & todo
      - name: ATTENDEE
      - name: RSTATUS
      - name: RDATE
    components:
      - name: VALARM

  - name: VJOURNAL
    includes_templates:
      - object
      - descriptive object
      - recurrent object  # TODO why did the spec allow this?
    properties:
      - name: DESCRIPTION
        multiple: true
      # TODO shared between event & todo
      - name: RSTATUS
      - name: RDATE

  # TODO thefuck, this is used in requests, aagh!
  - name: VFREEBUSY
    includes_templates:
      - object
    # TODO expand

  - name: VTIMEZONE
    properties:
      - tzid
      - last-mod
      - tzurl
    components:
      - STANDARD
      - DAYLIGHT

  - template: yes
    name: timezone properties
    includes_templates:
      - recurrent object
    properties:
      # required, must once
      - dtstart
      - tzoffsetto
      - tzoffsetfrom
      # TODO multiple
      - comment
      - rdate
      - tzname

  - name: STANDARD
    includes_templates:
      - timezone properties

  - name: DAYLIGHT
    includes_templates:
      - timezone properties

  - name: VALARM
    variants:
      - on_property: ACTION
        on_value: AUDIO
        properties:
          # optional, once
          - attach
      - on_property: ACTION
        on_value: DISPLAY
        properties:
          # required, once
          - name: DESCRIPTION
            required: true
      - on_property: ACTION
        on_value: EMAIL
        properties:
          # required, once
          - name: DESCRIPTION
            required: true
          - name: SUMMARY
            required: true
          # required, TODO multiple
          - name: ATTENDEE
            required: true
          # TODO multiple
          - ATTACH
    properties:
      # TODO must occur together
      - duration
      - repeat


# TODO (?) let properties describe their own behavior on multiple values
# - breaks on VALARM(ACTION=AUDIO) as ATTACH is only allowed once

properties:

  # TODO those all allow other-param

  - name: CALSCALE
    type: enum
    default_omit: GREGORIAN
    default_unknown: fail
    values:
      - name: GREGORIAN

  - name: METHOD
    type: enum

  - name: PRODID
    type: TEXT

  - name: VERSION
    type: enum
    is_tuple:
      # either <maxver> OR <minver>;<maxver>
      min: 1
      max: 2
    values:
      - name: "2.0"

  - name: ATTACH
    type: URI
    other_types:
      - BINARY
    parameters:
      - FMTTYPE

  - name: CATEGORIES
    type: TEXT
    is_list: true  # is list of comma-separated values
    if_multiple:
      mergable: true  # merging into comma separated list is allowed & does not change the meaning
      keep_parameters: true  # TODO is no here ever required?
    parameters:
      - language

  - name: CLASS
    type: enum
    default_omit: PUBLIC
    default_unknown: PRIVATE
    values:
      - name: PUBLIC
      - name: PRIVATE
      - name: CONFIDENTIAL

  - name: COMMENT
    type: TEXT
    parameters:
      - altrep
      - language

  - name: DESCRIPTION
    type: text
    parameters:
      - altrep
      - language

  - name: GEO
    type: FLOAT
    is_tuple:
      min: 2
      max: 2
    precision: 6
    comment: |
      latitude & longitude values

  - name: LOCATION
    type: TEXT
    parameters:
      - altrep
      - language

  - name: PERCENT-COMPLETE
    type: INTEGER
    min: 0
    max: 100
    default_omit: 0

  - name: PRIORITY
    type: INTEGER
    min: 0
    max: 9
    default_omit: 0

  - name: RESOURCES
    type: TEXT
    is_list: true
    if_multiple:
      mergable: true
    parameters:
      - altrep
      - language

  - name: STATUS
    type: enum
    final: true  # future specification may not overwrite & vendor values are not allowed
    # TODO possible values differ
    values:
      # for event
      - TENTIATIVE
      - CONFIRMED
      - CANCELLED
      # for todo
      - NEEDS-ACTION
      - COMPLETED
      - IN-PROGRESS
      - CANCELLED
      # for journal
      - DRAFT
      - FINAL
      - CANCELLED

  - name: SUMMARY
    type: TEXT
    parameters:
      - altrep
      - language

  - name: COMPLETED
    type: DATE-TIME
    force_utc: true

  - name: DTEND
    type: DATE-TIME
    other_types:
      - DATE
    # TODO is compare_with required for this meta spec?
    compare_with:  # constraints type (date-time/date) & local time on both to be equal
      - name: DTSTART
        order: ">="  # dtend >= dtstart
    parameters:
      - TZID

  - name: DUE
    type: DATE-TIME
    other_types:
      - DATE
    compare_with:
      - name: DTSTART
        order: ">="
    parameters:
      - TZID

  - name: DTSTART
    type: DATE-TIME
    other_types:
      - DATE

  - name: DURATION
    type: DURATION
    compare_with:  # constraints types, but does not compare them
      - name: DTSTART

  - name: FREEBUSY
    type: PERIOD
    parameters:
      - FBTYPE

  - name: TRANSP
    type: enum
    final: true
    default_omit: OPAQUE
    values:
      - OPAQUE
      - TRANSPARENT

  - name: TZID
    type: TEXT

  - name: TZNAME
    type: TEXT
    parameters:
      - language

  - name: TZOFFSETFROM
    type: UTC-OFFSET

  - name: TZOFFSETTO
    type: UTC-OFFSET

  - name: TZURL
    type: URI

  - name: ATTENDEE
    type: CAL-ADDRESS
    parameters:
      - CUTYPE
      - MEMBER
      - ROLE
      - PARTSTAT
      - RVSP
      - MEMBER
      - DELEGATED-TO
      - DELEGATED-FROM
      - SEND-BY
      - CN
      - DIR
      - LANGUAGE

  - name: CONTACT
    type: TEXT
    parameters:
      - language

  - name: ORGANIZER
    type: CAL-ADDRESS
    parameters:
      - CN
      - DIR
      - SEND-BY
      - LANGUAGE

  - name: RECURRENCE-ID
    compare_with:  # allows to infer type’s
      - name: DTSTART
    parameters:
      - TZID
      - RANGE

  - name: RELATED-TO
    type: reference  # this value references one with the same value of type uid
    parameters:
      - name: RELTYPE
        default_omit: PARENT
        default_unknown: PARENT
        values:
          - PARENT
          - CHILD
          - SIBLING

  - name: URL
    type: URI

  - name: UID
    type: uid  # all values with that type need to be unique

  - name: EXDATE
    type: DATE-TIME
    other_types:
      - DATE
    is_list: true
    if_multiple:
      mergable: true
    parameters:
      - TZID

  - name: RDATE
    type: DATE-TIME
    other_types:
      - DATE
      - PERIOD
    is_list: true
    if_multiple:
      mergable: true
    parameters:
      - TZID

  - name: RRULE
    type: RECUR

  - name: ACTION
    type: enum
    default_unknown: ignore
    values:
      - AUDIO
      - DISPLAY
      - EMAIL

  - name: REPEAT
    type: INTEGER
    default_omit: 0

  - name: TRIGGER
    type: DURATION
    other_types:
      - DATE-TIME
    force_utc: true
    parameters:
      # TODO not valid for type=date-time
      - name: RELATED
        # TODO related vals require different
        values:
          - END  # requires DTSTART & DURATION or DTEND
          - START  # requires DTSTART

  - name: CREATED
    type: DATE-TIME
    force_utc: true

  - name: DTSTAMP
    type: DATE-TIME
    force_utc: true

  - name: LAST-MODIFIED
    type: DATE-TIME
    force_utc: true

  - name: SEQUENCE
    type: INTEGER

  - name: REQUEST-STATUS
    type: TEXT
    # not modelled better because not required


parameters:

  - name: ALTREP
    type: uri
    force_quoted: true

  - name: CN

  - name: CUTYPE
    default_omit: INDIVIDUAL
    default_unknown: UNKNOWN
    values:
      - INDIVIDUAL
      - GROUP
      - RESOURCE
      - ROOM
      - UNKNOWN

  - name: DELEGATED-FROM
    type: CAL-ADDRESS
    is_list: true
    force_quoted: true

  - name: DELEGATED-TO
    type: CAL-ADDRESS
    is_list: true
    force_quoted: true

  - name: DIR
    force_quoted: true

  - name: ENCODING
    final: true  # TODO convert final=true to extensible=true on reversed
    values:
      - 8BIT
      - BASE64

  - name: FMTTYPE
    type: MIME-TYPE

  - name: FBTYPE
    extensible: true
    default_omit: BUSY
    default_unknown: BUSY
    values:
      - FREE
      - BUSY
      - BUSY-UNAVAILABLE
      - BUSY-TENTIATIVE

  - name: LANGUAGE
    type: LANG-TAG

  - name: MEMBER
    type: CAL-ADDRESS
    is_list: true
    force_quoted: true

  # TODO 3 variants again
  - name: PARTSTAT
    extensible: true
    default_omit: NEEDS-ACTION
    default_unknown: NEEDS-ACTION
    values:
      # event
      - NEEDS-ACTION
      - ACCEPTED
      - DECLINED
      - TENTATIVE
      - DELEGATED
      # todo
      - NEEDS-ACTION
      - ACCEPTED
      - DECLINED
      - TENTATIVE
      - DELEGATED
      - COMPLETED
      - IN-PROCESS
      # journal
      - NEEDS-ACTION
      - ACCEPTED
      - DECLINED

  - name: RANGE
    # TODO: extensible: false
    values:
      - THISANDFUTURE
      # TODO: "THISANDPRIOR" was deprecated

  - name: RELATED
    default_omit: START
    values:
      - START
      - END

  - name: RELTYPE
    extensible: true
    default_omit: PARENT
    default_unknown: PARENT
    values:
      - PARENT
      - CHILD
      - SIBLING

  - name: ROLE
    extensible: true
    default_omit: REQ-PARTICIPANT
    default_unknown: REQ-PARTICIPANT
    values:
      - CHAIR
      - REQ-PARTICIPANT
      - OPT-PARTICIPANT
      - NON-PARTICIPANT

  - name: RVSP
    type: BOOLEAN
    default_omit: "FALSE"

  - name: SENT-BY
    type: CAL-ADDRESS
    force_quoted: true

  - name: TZID
    type: TIMEZONE

  # VALUE is a special parameter used for TYPE introspection
  - name: VALUE
    extensible: true
    values:
      - BINARY
      - BOOLEAN
      - CAL-ADDRESS
      - DATE
      - DATE-TIME
      - DURATION
      - FLOAT
      - INTEGER
      - PERIOD
      - RECUR
      - TEXT
      - TIME
      - URI
      - UTC-OFFSET