// Copyright (C) 2018 Martin Mroz
//
// This software may be modified and distributed under the terms
// of the MIT license.  See the LICENSE file for details.

use std::fmt;

#[derive(Copy,Clone,Eq,PartialEq,Ord,PartialOrd,Debug,Hash)]
pub enum Field {
    /// Item 1: Format Code. 1 byte. Data Type 'f'.
    FormatCode,
    /// Item 4: Airline Individual Use. n bytes. Data Type unspecified.
    AirlineIndividualUse,
    /// Item 5: Number of Legs Encoded. 1 byte. Data Type 'N'.
    NumberOfLegsEncoded,
    /// Item 6: Field Size of Variable Size Field. 2 byte. Data Type 'f'. Hexadecimal.
    FieldSizeOfVariableSizeField,
    /// Item 7: Operating Carrier PNR Code. 7 bytes. Data Type 'f'.
    OperatingCarrierPnrCode,
    /// Item 8: Beginning of Version Number. 1 byte. Data Type 'f'.
    BeginningOfVersionNumber,
    /// Item 9: Version Number. 1 byte. Data Type 'f'.
    VersionNumber,
    /// Item 10: Field Size of Structured Message. 2 byte. Data Type 'f'. Hexadecimal.
    FieldSizeOfStructuredMessageUnique,
    /// Item 11: Passenger Name. 20 bytes. Data Type 'f'.
    PassengerName,
    /// Item 12: Source of Check-In. 1 byte. Data Type 'f'.
    SourceOfCheckIn,
    /// Item 14: Source of Boarding Pass Issuance. 1 byte. Data Type 'f'.
    SourceOfBoardingPassIssuance,
    /// Item 15: Passenger Description. 1 byte. Data Type 'f'.
    PassengerDescription,
    /// Item 16: Document Type. 1 byte. Data Type 'f'.
    DocumentType,
    /// Item 17: Field Size of Structured Message. 2 byte. Data Type 'f'. Hexadecimal.
    FieldSizeOfStructuredMessageRepeated,
    /// Item 18: Selectee Indicator. 1 byte. Data Type 'f'.
    SelecteeIndicator,
    /// Item 19: Marketing Carrier Designator. 3 bytes. Data Type 'f'.
    MarketingCarrierDesignator,
    /// Item 20: Frequent Flyer Airline Designator. 3 bytes. Data Type 'f'.
    FrequentFlyerAirlineDesignator,
    /// Item 21: Airline Designator of Boarding Pass Issuer. 3 bytes. Data Type 'f'.
    AirlineDesignatorOfBoardingPassIssuer,
    /// Item 22: Date of Issue of Boarding Pass. 4 bytes. Data Type 'N'.
    DateOfIssueOfBoardingPass,
    /// Item 23: Baggage Tag License Plate Number(s). 13 bytes. Data Type 'f'.
    BaggageTagLicensePlateNumbers,
    /// Item 25: Beginning of Security Data. 1 byte. Data Type 'f'.
    BeginningOfSecurityData,
    /// Item 26: From City Airport Code. 3 bytes. Data Type 'a'.
    FromCityAirportCode,
    /// Item 28: Type of Security Data. 1 byte. Data Type 'f'.
    TypeOfSecurityData,
    /// Item 29: Length of Security Data. 2 bytes. Data Type 'f'. Hexadecimal.
    LengthOfSecurityData,
    /// Item 30: Security Data. n bytes. Data Type 'f'.
    SecurityData,
    /// Item 31: First Non-Consecutive Baggage Tag License Plate Number. 13 bytes. Data Type 'f'.
    FirstNonConsecutiveBaggageTagLicensePlateNumbers,
    /// Item 32: Second Non-Consecutive Baggage Tag License Plate Number. 13 bytes. Data Type 'f'.
    SecondNonConsecutiveBaggageTagLicensePlateNumbers,
    /// Item 38: To City Airport Code. 3 bytes. Data Type 'a'.
    ToCityAirportCode,
    /// Item 42: Operating Carrier Designator. 3 bytes. Data Type 'f'.
    OperatingCarrierDesignator,
    /// Item 43: Flight Number. 5 bytes. Data Type 'NNNN\[a\]'.
    FlightNumber,
    /// Item 46: Date of Flight. 3 bytes. Data Type 'N'.
    DateOfFlight,
    /// Item 71: Compartment Code. 1 byte. Data Type 'a'.
    CompartmentCode,
    /// Item 89: Electronic Ticket Indicator. 1 byte. Data Type 'f'.
    IdAdIndicator,
    /// Item 104: Seat Number. 4 bytes. Data Type is usually 'NNNa', but can be 'INF ' or similar.
    SeatNumber,
    /// Item 107: Check-In Sequence Number. 5 bytes. Data Type is usually 'NNNN\[f\]', but can be 'f'.
    CheckInSequenceNumber,
    /// Item 108: International Document Verification. 1 byte. Data Type 'f'.
    InternationalDocumentVerification,
    /// Item 117: Passenger Status. 1 byte. Data Type 'f'.
    PassengerStatus,
    /// Item 118: Free Baggage Allowance. 3 bytes. Data Type 'f'.
    FreeBaggageAllowance,
    /// Item 142: Airline Numeric Code. 3 bytes. Data Type 'N'.
    AirlineNumericCode,
    /// Item 143: Document Form / Serial Number. 10 bytes. Data Type 'f'.
    DocumentFormSerialNumber,
    /// Item 236: Frequent Flyer Number. 16 bytes. Data Type 'f'.
    FrequentFlyerNumber,
    /// Item 253: Electronic Ticket Indicator. 1 byte. Data Type 'f'.
    ElectronicTicketIndicator,
    /// Item 254: Fast Track. 1 byte. Data Type 'f'.
    FastTrack,
}

impl Field {

    /// The required length of the field. If zero, the field may be arbitrarily long.
    pub fn len(self) -> usize {
        match self {
            Field::FormatCode => 1,
            Field::AirlineIndividualUse => 0,
            Field::NumberOfLegsEncoded => 1,
            Field::FieldSizeOfVariableSizeField => 2,
            Field::OperatingCarrierPnrCode => 7,
            Field::BeginningOfVersionNumber => 1,
            Field::VersionNumber => 1,
            Field::FieldSizeOfStructuredMessageUnique => 2,
            Field::PassengerName => 20,
            Field::SourceOfCheckIn => 1,
            Field::SourceOfBoardingPassIssuance => 1,
            Field::PassengerDescription => 1,
            Field::DocumentType => 1,
            Field::FieldSizeOfStructuredMessageRepeated => 2,
            Field::SelecteeIndicator => 1,
            Field::MarketingCarrierDesignator => 3,
            Field::FrequentFlyerAirlineDesignator => 3,
            Field::AirlineDesignatorOfBoardingPassIssuer => 3,
            Field::DateOfIssueOfBoardingPass => 4,
            Field::BaggageTagLicensePlateNumbers => 13,
            Field::BeginningOfSecurityData => 1,
            Field::FromCityAirportCode => 3,
            Field::TypeOfSecurityData => 1,
            Field::LengthOfSecurityData => 2,
            Field::SecurityData => 0,
            Field::FirstNonConsecutiveBaggageTagLicensePlateNumbers => 13,
            Field::SecondNonConsecutiveBaggageTagLicensePlateNumbers => 13,
            Field::ToCityAirportCode => 3,
            Field::OperatingCarrierDesignator => 3,
            Field::FlightNumber => 5,
            Field::DateOfFlight => 3,
            Field::CompartmentCode => 1,
            Field::IdAdIndicator => 1,
            Field::SeatNumber => 4,
            Field::CheckInSequenceNumber => 5,
            Field::InternationalDocumentVerification => 1,
            Field::PassengerStatus => 1,
            Field::FreeBaggageAllowance => 3,
            Field::AirlineNumericCode => 3,
            Field::DocumentFormSerialNumber => 10,
            Field::FrequentFlyerNumber => 16,
            Field::ElectronicTicketIndicator => 1,
            Field::FastTrack => 1,
        }
    }

    /// Name of the field as defined in the Implementation Guide.
    pub fn name(self) -> &'static str {
        match self {
            Field::FormatCode => 
                "Format Code",
            Field::AirlineIndividualUse => 
                "Airline Individual Use",
            Field::NumberOfLegsEncoded => 
                "Number of Legs Encoded",
            Field::FieldSizeOfVariableSizeField => 
                "Field Size of Variable Size Field",
            Field::OperatingCarrierPnrCode => 
                "Operating Carrier PNR Code",
            Field::BeginningOfVersionNumber => 
                "Beginning of Version Number",
            Field::VersionNumber => 
                "Version Number",
            Field::FieldSizeOfStructuredMessageUnique => 
                "Field Size of Strutured Message (Unique)",
            Field::PassengerName => 
                "Passenger Name",
            Field::SourceOfCheckIn => 
                "Source of Check-In",
            Field::SourceOfBoardingPassIssuance => 
                "Source of Boarding Pass Issuance",
            Field::PassengerDescription => 
                "Passenger Description",
            Field::DocumentType => 
                "Document Type",
            Field::FieldSizeOfStructuredMessageRepeated => 
                "Field Size of Strutured Message (Repeated)",
            Field::SelecteeIndicator => 
                "Selectee Indicator",
            Field::MarketingCarrierDesignator => 
                "Marketing Carrier Designator",
            Field::FrequentFlyerAirlineDesignator => 
                "Frequent Flyer Airline Designator",
            Field::AirlineDesignatorOfBoardingPassIssuer => 
                "Airline Designator of Boarding Pass Issuer",
            Field::DateOfIssueOfBoardingPass => 
                "Date of Issue of Boarding Pass",
            Field::BaggageTagLicensePlateNumbers => 
                "Baggage Tag License Plate Number(s)",
            Field::BeginningOfSecurityData => 
                "Beginning of Security Data",
            Field::FromCityAirportCode => 
                "From City Airport Code",
            Field::TypeOfSecurityData => 
                "Type of Security Data",
            Field::LengthOfSecurityData => 
                "Length of Security Data",
            Field::SecurityData => 
                "Security Data",
            Field::FirstNonConsecutiveBaggageTagLicensePlateNumbers =>
                "First Non-Consecutive Baggage Tag License Plate Number",
            Field::SecondNonConsecutiveBaggageTagLicensePlateNumbers =>
                "Second Non-Consecutive Baggage Tag License Plate Number",
            Field::ToCityAirportCode => 
                "To City Airport Code",
            Field::OperatingCarrierDesignator => 
                "Operating Carrier Designator",
            Field::FlightNumber => 
                "Flight Number",
            Field::DateOfFlight => 
                "Date of Flight",
            Field::CompartmentCode => 
                "Compartment Code",
            Field::IdAdIndicator => 
                "ID/AD Indicator",
            Field::SeatNumber => 
                "Seat Number",
            Field::CheckInSequenceNumber => 
                "Check-In Sequence Number",
            Field::InternationalDocumentVerification => 
                "International Document Verification",
            Field::PassengerStatus => 
                "Passenger Status",
            Field::FreeBaggageAllowance => 
                "Free Baggage Allowance",
            Field::AirlineNumericCode => 
                "Airline Numeric Code",
            Field::DocumentFormSerialNumber => 
                "Document Form / Serial Number",
            Field::FrequentFlyerNumber => 
                "Frequent Flyer Number",
            Field::ElectronicTicketIndicator => 
                "Electronic Ticket Indicator",
            Field::FastTrack => 
                "Fast Track",
        }
    }

}

impl fmt::Display for Field {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str(self.name())
    }
}