"""
DSC (Digital Selective Calling) constants per ITU-R M.493.

This module contains all DSC-specific constants including format codes,
distress nature codes, telecommand definitions, and MID (Maritime
Identification Digits) country mappings.
"""

from __future__ import annotations

# =============================================================================
# DSC Format Codes (Category)
# Per ITU-R M.493-15 Table 1
# =============================================================================

FORMAT_CODES = {
    100: 'DISTRESS',       # All ships distress alert
    102: 'ALL_SHIPS',      # All ships call
    104: 'GROUP',          # Group call
    106: 'DISTRESS_ACK',   # Distress acknowledgement
    108: 'DISTRESS_RELAY', # Distress relay
    110: 'GEOGRAPHIC',     # Geographic area call
    112: 'INDIVIDUAL',     # Individual call
    114: 'INDIVIDUAL_ACK', # Individual acknowledgement
    116: 'ROUTINE',        # Routine call
    118: 'SAFETY',         # Safety call
    120: 'URGENCY',        # Urgency call
}

# Category priority (lower = higher priority)
CATEGORY_PRIORITY = {
    'DISTRESS': 0,
    'DISTRESS_ACK': 1,
    'DISTRESS_RELAY': 2,
    'URGENCY': 3,
    'SAFETY': 4,
    'ROUTINE': 5,
    'ALL_SHIPS': 5,
    'GROUP': 5,
    'GEOGRAPHIC': 5,
    'INDIVIDUAL': 5,
    'INDIVIDUAL_ACK': 5,
}


# =============================================================================
# Nature of Distress Codes
# Per ITU-R M.493-15 Table 3
# =============================================================================

DISTRESS_NATURE_CODES = {
    100: 'UNDESIGNATED',    # Undesignated distress
    101: 'FIRE',            # Fire, explosion
    102: 'FLOODING',        # Flooding
    103: 'COLLISION',       # Collision
    104: 'GROUNDING',       # Grounding
    105: 'LISTING',         # Listing, in danger of capsizing
    106: 'SINKING',         # Sinking
    107: 'DISABLED',        # Disabled and adrift
    108: 'ABANDONING',      # Abandoning ship
    109: 'PIRACY',          # Piracy/armed robbery attack
    110: 'MOB',             # Man overboard
    112: 'EPIRB',           # EPIRB emission
}


# =============================================================================
# Telecommand Codes (First and Second)
# Per ITU-R M.493-15 Tables 4-5
# =============================================================================

TELECOMMAND_CODES = {
    # First telecommand (type of subsequent communication)
    100: 'F3E_G3E_ALL',        # F3E/G3E all modes (VHF telephony)
    101: 'F3E_G3E_DUPLEX',     # F3E/G3E duplex
    102: 'POLLING',            # Polling
    103: 'UNABLE_TO_COMPLY',   # Unable to comply
    104: 'END_OF_CALL',        # End of call
    105: 'DATA',               # Data
    106: 'J3E_TELEPHONY',      # J3E telephony (SSB)
    107: 'DISTRESS_ACK',       # Distress acknowledgement
    108: 'DISTRESS_RELAY',     # Distress relay
    109: 'F1B_J2B_FEC',        # F1B/J2B FEC NBDP telegraphy
    110: 'F1B_J2B_ARQ',        # F1B/J2B ARQ NBDP telegraphy
    111: 'TEST',               # Test
    112: 'SHIP_POSITION',      # Ship position request
    113: 'NO_INFO',            # No information
    118: 'FREQ_ANNOUNCEMENT',  # Frequency announcement
    126: 'NO_REASON',          # No reason given

    # Second telecommand (additional info)
    200: 'F3E_G3E_SIMPLEX',    # Simplex VHF telephony requested
    201: 'POLL_RESPONSE',      # Poll response
}


# =============================================================================
# DSC Symbol Definitions
# Per ITU-R M.493-15
# =============================================================================

# Special symbols
DSC_SYMBOLS = {
    120: 'DX',      # Dot pattern (synchronization)
    121: 'RX',      # Phasing sequence RX
    122: 'SX',      # Phasing sequence SX
    123: 'S0',      # Phasing sequence S0
    124: 'S1',      # Phasing sequence S1
    125: 'S2',      # Phasing sequence S2
    126: 'S3',      # Phasing sequence S3
    127: 'EOS',     # End of sequence
}


# =============================================================================
# MID (Maritime Identification Digits) Country Mapping
# First 3 digits of MMSI identify the country
# Per ITU MID table (partial list of common codes)
# =============================================================================

MID_COUNTRY_MAP = {
    # Americas
    '201': 'Albania',
    '202': 'Andorra',
    '203': 'Austria',
    '204': 'Azores',
    '205': 'Belgium',
    '206': 'Belarus',
    '207': 'Bulgaria',
    '208': 'Vatican City',
    '209': 'Cyprus',
    '210': 'Cyprus',
    '211': 'Germany',
    '212': 'Cyprus',
    '213': 'Georgia',
    '214': 'Moldova',
    '215': 'Malta',
    '216': 'Armenia',
    '218': 'Germany',
    '219': 'Denmark',
    '220': 'Denmark',
    '224': 'Spain',
    '225': 'Spain',
    '226': 'France',
    '227': 'France',
    '228': 'France',
    '229': 'Malta',
    '230': 'Finland',
    '231': 'Faroe Islands',
    '232': 'United Kingdom',
    '233': 'United Kingdom',
    '234': 'United Kingdom',
    '235': 'United Kingdom',
    '236': 'Gibraltar',
    '237': 'Greece',
    '238': 'Croatia',
    '239': 'Greece',
    '240': 'Greece',
    '241': 'Greece',
    '242': 'Morocco',
    '243': 'Hungary',
    '244': 'Netherlands',
    '245': 'Netherlands',
    '246': 'Netherlands',
    '247': 'Italy',
    '248': 'Malta',
    '249': 'Malta',
    '250': 'Ireland',
    '251': 'Iceland',
    '252': 'Liechtenstein',
    '253': 'Luxembourg',
    '254': 'Monaco',
    '255': 'Madeira',
    '256': 'Malta',
    '257': 'Norway',
    '258': 'Norway',
    '259': 'Norway',
    '261': 'Poland',
    '262': 'Montenegro',
    '263': 'Portugal',
    '264': 'Romania',
    '265': 'Sweden',
    '266': 'Sweden',
    '267': 'Slovakia',
    '268': 'San Marino',
    '269': 'Switzerland',
    '270': 'Czech Republic',
    '271': 'Turkey',
    '272': 'Ukraine',
    '273': 'Russia',
    '274': 'North Macedonia',
    '275': 'Latvia',
    '276': 'Estonia',
    '277': 'Lithuania',
    '278': 'Slovenia',
    '279': 'Serbia',

    # North America
    '301': 'Anguilla',
    '303': 'USA',
    '304': 'Antigua and Barbuda',
    '305': 'Antigua and Barbuda',
    '306': 'Curacao',
    '307': 'Aruba',
    '308': 'Bahamas',
    '309': 'Bahamas',
    '310': 'Bermuda',
    '311': 'Bahamas',
    '312': 'Belize',
    '314': 'Barbados',
    '316': 'Canada',
    '319': 'Cayman Islands',
    '321': 'Costa Rica',
    '323': 'Cuba',
    '325': 'Dominica',
    '327': 'Dominican Republic',
    '329': 'Guadeloupe',
    '330': 'Grenada',
    '331': 'Greenland',
    '332': 'Guatemala',
    '334': 'Honduras',
    '336': 'Haiti',
    '338': 'USA',
    '339': 'Jamaica',
    '341': 'Saint Kitts and Nevis',
    '343': 'Saint Lucia',
    '345': 'Mexico',
    '347': 'Martinique',
    '348': 'Montserrat',
    '350': 'Nicaragua',
    '351': 'Panama',
    '352': 'Panama',
    '353': 'Panama',
    '354': 'Panama',
    '355': 'Panama',
    '356': 'Panama',
    '357': 'Panama',
    '358': 'Puerto Rico',
    '359': 'El Salvador',
    '361': 'Saint Pierre and Miquelon',
    '362': 'Trinidad and Tobago',
    '364': 'Turks and Caicos',
    '366': 'USA',
    '367': 'USA',
    '368': 'USA',
    '369': 'USA',
    '370': 'Panama',
    '371': 'Panama',
    '372': 'Panama',
    '373': 'Panama',
    '374': 'Panama',
    '375': 'Saint Vincent and the Grenadines',
    '376': 'Saint Vincent and the Grenadines',
    '377': 'Saint Vincent and the Grenadines',
    '378': 'British Virgin Islands',
    '379': 'US Virgin Islands',

    # Asia
    '401': 'Afghanistan',
    '403': 'Saudi Arabia',
    '405': 'Bangladesh',
    '408': 'Bahrain',
    '410': 'Bhutan',
    '412': 'China',
    '413': 'China',
    '414': 'China',
    '416': 'Taiwan',
    '417': 'Sri Lanka',
    '419': 'India',
    '422': 'Iran',
    '423': 'Azerbaijan',
    '425': 'Iraq',
    '428': 'Israel',
    '431': 'Japan',
    '432': 'Japan',
    '434': 'Turkmenistan',
    '436': 'Kazakhstan',
    '437': 'Uzbekistan',
    '438': 'Jordan',
    '440': 'South Korea',
    '441': 'South Korea',
    '443': 'Palestine',
    '445': 'North Korea',
    '447': 'Kuwait',
    '450': 'Lebanon',
    '451': 'Kyrgyzstan',
    '453': 'Macao',
    '455': 'Maldives',
    '457': 'Mongolia',
    '459': 'Nepal',
    '461': 'Oman',
    '463': 'Pakistan',
    '466': 'Qatar',
    '468': 'Syria',
    '470': 'UAE',
    '471': 'UAE',
    '472': 'Tajikistan',
    '473': 'Yemen',
    '475': 'Yemen',
    '477': 'Hong Kong',
    '478': 'Bosnia and Herzegovina',

    # Oceania
    '501': 'Adelie Land',
    '503': 'Australia',
    '506': 'Myanmar',
    '508': 'Brunei',
    '510': 'Micronesia',
    '511': 'Palau',
    '512': 'New Zealand',
    '514': 'Cambodia',
    '515': 'Cambodia',
    '516': 'Christmas Island',
    '518': 'Cook Islands',
    '520': 'Fiji',
    '523': 'Cocos Islands',
    '525': 'Indonesia',
    '529': 'Kiribati',
    '531': 'Laos',
    '533': 'Malaysia',
    '536': 'Northern Mariana Islands',
    '538': 'Marshall Islands',
    '540': 'New Caledonia',
    '542': 'Niue',
    '544': 'Nauru',
    '546': 'French Polynesia',
    '548': 'Philippines',
    '550': 'Timor-Leste',
    '553': 'Papua New Guinea',
    '555': 'Pitcairn Island',
    '557': 'Solomon Islands',
    '559': 'American Samoa',
    '561': 'Samoa',
    '563': 'Singapore',
    '564': 'Singapore',
    '565': 'Singapore',
    '566': 'Singapore',
    '567': 'Thailand',
    '570': 'Tonga',
    '572': 'Tuvalu',
    '574': 'Vietnam',
    '576': 'Vanuatu',
    '577': 'Vanuatu',
    '578': 'Wallis and Futuna',

    # Africa
    '601': 'South Africa',
    '603': 'Angola',
    '605': 'Algeria',
    '607': 'St. Paul and Amsterdam Islands',
    '608': 'Ascension Island',
    '609': 'Burundi',
    '610': 'Benin',
    '611': 'Botswana',
    '612': 'Central African Republic',
    '613': 'Cameroon',
    '615': 'Congo',
    '616': 'Comoros',
    '617': 'Cabo Verde',
    '618': 'Crozet Archipelago',
    '619': 'Ivory Coast',
    '620': 'Comoros',
    '621': 'Djibouti',
    '622': 'Egypt',
    '624': 'Ethiopia',
    '625': 'Eritrea',
    '626': 'Gabon',
    '627': 'Ghana',
    '629': 'Gambia',
    '630': 'Guinea-Bissau',
    '631': 'Equatorial Guinea',
    '632': 'Guinea',
    '633': 'Burkina Faso',
    '634': 'Kenya',
    '635': 'Kerguelen Islands',
    '636': 'Liberia',
    '637': 'Liberia',
    '638': 'South Sudan',
    '642': 'Libya',
    '644': 'Lesotho',
    '645': 'Mauritius',
    '647': 'Madagascar',
    '649': 'Mali',
    '650': 'Mozambique',
    '654': 'Mauritania',
    '655': 'Malawi',
    '656': 'Niger',
    '657': 'Nigeria',
    '659': 'Namibia',
    '660': 'Reunion',
    '661': 'Rwanda',
    '662': 'Sudan',
    '663': 'Senegal',
    '664': 'Seychelles',
    '665': 'Saint Helena',
    '666': 'Somalia',
    '667': 'Sierra Leone',
    '668': 'Sao Tome and Principe',
    '669': 'Swaziland',
    '670': 'Chad',
    '671': 'Togo',
    '672': 'Tunisia',
    '674': 'Tanzania',
    '675': 'Uganda',
    '676': 'Democratic Republic of Congo',
    '677': 'Tanzania',
    '678': 'Zambia',
    '679': 'Zimbabwe',

    # South America
    '701': 'Argentina',
    '710': 'Brazil',
    '720': 'Bolivia',
    '725': 'Chile',
    '730': 'Colombia',
    '735': 'Ecuador',
    '740': 'Falkland Islands',
    '745': 'Guiana',
    '750': 'Guyana',
    '755': 'Paraguay',
    '760': 'Peru',
    '765': 'Suriname',
    '770': 'Uruguay',
    '775': 'Venezuela',
}


# =============================================================================
# VHF Channel Frequencies (MHz) for DSC follow-up
# =============================================================================

VHF_CHANNELS = {
    6: 156.300,   # Intership safety
    8: 156.400,   # Commercial working
    9: 156.450,   # Calling
    10: 156.500,  # Commercial working
    12: 156.600,  # Port operations
    13: 156.650,  # Bridge-to-bridge navigation safety
    14: 156.700,  # Port operations
    16: 156.800,  # Distress, safety and calling (VHF voice)
    67: 156.375,  # UK small craft safety
    68: 156.425,  # Marina/yacht club
    70: 156.525,  # DSC distress, safety and calling
    71: 156.575,  # Port operations
    72: 156.625,  # Intership
    73: 156.675,  # Port operations
    74: 156.725,  # Port operations
    77: 156.875,  # Intership
}


# =============================================================================
# DSC Modulation Parameters
# =============================================================================

DSC_BAUD_RATE = 100  # 100 baud per ITU-R M.493

# FSK tone frequencies (Hz)
DSC_MARK_FREQ = 1800  # B (mark) - binary 1
DSC_SPACE_FREQ = 1200  # Y (space) - binary 0

# Audio sample rate for decoding
DSC_AUDIO_SAMPLE_RATE = 48000

# Frame structure
DSC_DOT_PATTERN_LENGTH = 200  # 200 bits of alternating pattern
DSC_PHASING_LENGTH = 7        # 7 symbols phasing sequence
DSC_MESSAGE_MAX_SYMBOLS = 180 # Maximum message length in symbols