tag = 'UNH'
Eancom.register_segment(tag: tag, klass: Eancom::Edifact::UNH)

structure = Eancom::Edifact::Structure.new(tag: tag)
#==============================================================================
# Tag                                                                         #
#==============================================================================
tag = Eancom::Edifact::Composite.new()
data = Eancom::Edifact::Data.new(
  type: String,
  length: 3,
  dictionary: nil,
  description: "Message Header",
  required: true
)
tag.add(:tag, data)

structure << tag
#==============================================================================
# Message reference number                                                    #
#==============================================================================
message_reference_number = Eancom::Edifact::Composite.new()
data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..14,
  dictionary: nil,
  description: 'Unique reference number assigned to a message within an interchange by the sender. Same reference number as in DE 0062 of the UNT segment of the message.',
  required: true
)
message_reference_number.add(:message_reference_number, data)

structure << message_reference_number
#==============================================================================
# Message Identifier                                                          #
#==============================================================================
message_identifier = Eancom::Edifact::Composite.new()

data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..6,
  dictionary: {
    'ORDERS' => {
      description: 'Purchase order message'
    },
    'SLSRPT' => {
      description: 'Sales data report message'
    },
    'DESADV' => {
      description: 'Despatch advice message'
    },
    'INVRPT' => {
      description: 'Inventory report message'
    },
    'PRICAT' => {
      description: 'Price catalogue message'
    },
    'ORDRSP' => {
      description: 'Orders report message'
    },
    'INVOIC' => {
      description: 'Invoice message'
    },
    'RETANN' => {
      description: 'Announcement for returns message'
    }
  },
  description: 'Message Type',
  required: true
)
message_identifier.add(:message_type, data)

data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..3,
  dictionary: {
    'D' => {
      description: 'UN/EDIFACT Directory'
    }
  },
  description: 'Message version number',
  required: true
)
message_identifier.add(:message_version_number, data)

data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..3,
  dictionary: {
    '01B' => {
      description: 'Release 2001 - B'
    },
    '93A' => {
      description: 'Release 93A'
    },
    '96A' => {
      description: 'Release 96A'
    },
    'UN' => {
      description: 'UN/CEFACT'
    }
  },
  description: 'Message release number',
  required: true
)
message_identifier.add(:message_release_number, data)

data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..2,
  dictionary: {
    'UN' => {
      description: 'UN/CEFACT'
    },
    'EN' => {
      description: 'Default value'
    }
  },
  description: 'Controlling agency',
  required: true
)
message_identifier.add(:controlling_agency, data)

data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..6,
  dictionary: {
    'EAN001' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN011' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN003' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN004' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN005' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN006' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN007' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN008' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN009' => {
      description: 'GS1 version control number (GS1 Permanent Code)'
    },
    'EAN010' => {
      description: 'GS1 version control number (GS1 Code)'
    },
    'GDSN23' => {
      description: 'GDSN version 2.3 (GS1 Permanent Code)'
    }
  },
  description: 'Association assigned code',
  required: false
)
message_identifier.add(:association_assigned_code, data)

structure << message_identifier
#==============================================================================
# Code list directory version number                                          #
#==============================================================================
code_list_directory_version_number = Eancom::Edifact::Composite.new()

data = Eancom::Edifact::Data.new(
  type: String,
  length: 1..6,
  dictionary: nil,
  description: 'Code list directory version number',
  required: false
)
code_list_directory_version_number.add(:code_list_directory_version_number, data)

structure << code_list_directory_version_number
#==============================================================================
Eancom.register_structure(tag: 'UNH', structure: structure)