import logging

from diskcache import Cache
from pyhamtools import LookupLib, Callinfo
from pyhamtools.frequency import freq_to_band
from pyhamtools.locator import latlong_to_locator

from core.config import config
from core.constants import BANDS, UNKNOWN_BAND, CW_MODES, PHONE_MODES, DATA_MODES, ALL_MODES, QRZCQ_CALLSIGN_LOOKUP_DATA

# Lookup helpers from pyhamtools
LOOKUP_LIB_BASIC = LookupLib(lookuptype="countryfile")
CALL_INFO_BASIC = Callinfo(LOOKUP_LIB_BASIC)
QRZ_AVAILABLE = config["qrz-password"] != ""
if QRZ_AVAILABLE:
    LOOKUP_LIB_QRZ = LookupLib(lookuptype="qrz", username=config["qrz-username"], pwd=config["qrz-password"])
# Cache of QRZ.com callsign lookups, so we don't repeatedly call the API for stuff we already know
QRZ_CALLSIGN_DATA_CACHE = Cache('.qrz_callsign_lookup_cache')

# Infer a mode from the comment
def infer_mode_from_comment(comment):
    for mode in ALL_MODES:
        if mode in comment.upper():
            return mode
    return None

# Infer a "mode family" from a mode.
def infer_mode_type_from_mode(mode):
    if mode.upper() in CW_MODES:
        return "CW"
    elif mode.upper() in PHONE_MODES:
        return "PHONE"
    elif mode.upper() in DATA_MODES:
        return "DATA"
    else:
        if mode.upper() != "OTHER":
            logging.warn("Found an unrecognised mode: " + mode + ". Developer should categorise this.")
        return None

# Infer a band from a frequency in Hz
def infer_band_from_freq(freq):
    for b in BANDS:
        if b.start_freq <= freq <= b.end_freq:
            return b
    return UNKNOWN_BAND

# Infer a country name from a callsign
def infer_country_from_callsign(call):
    try:
        # Use the full callsign, falling back to the base callsign, assuming this will be the longest of any /-separated
        # sections.
        country = CALL_INFO_BASIC.get_country_name(call)
        if not country:
            base_call = max(call.split("/"), key=len)
            country = CALL_INFO_BASIC.get_country_name(base_call)
    except KeyError as e:
        country = None
    # Couldn't get anything from basic call info database, try QRZ.com
    if not country:
        qrz_data = get_qrz_data_for_callsign(call)
        if qrz_data and "country" in qrz_data:
            country = qrz_data["country"]
    # Couldn't get anything from QRZ.com database, try QRZCQ data
    if not country:
        qrzcq_data = get_qrzcq_data_for_callsign(call)
        if qrzcq_data and qrzcq_data["country"]:
            country = qrzcq_data["country"]
    return country

# Infer a DXCC ID from a callsign
def infer_dxcc_id_from_callsign(call):
    try:
        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
        # callsign, assuming this will be the longest of any /-separated sections. Then if that doesn't provide data,
        # and we have QRZ data, try the same with that.
        dxcc = CALL_INFO_BASIC.get_adif_id(call)
        if not dxcc:
            base_call = max(call.split("/"), key=len)
            dxcc = CALL_INFO_BASIC.get_adif_id(base_call)
    except KeyError as e:
        dxcc = None
    # Couldn't get anything from basic call info database, try QRZ.com
    if not dxcc:
        qrz_data = get_qrz_data_for_callsign(call)
        if qrz_data and "adif" in qrz_data:
            dxcc = qrz_data["adif"]
    # Couldn't get anything from QRZ.com database, try QRZCQ data
    if not dxcc:
        qrzcq_data = get_qrzcq_data_for_callsign(call)
        if qrzcq_data and qrzcq_data["dxcc"]:
            dxcc = qrzcq_data["dxcc"]
    return dxcc

# Infer a continent shortcode from a callsign
def infer_continent_from_callsign(call):
    try:
        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
        # callsign, assuming this will be the longest of any /-separated sections.
        continent = CALL_INFO_BASIC.get_continent(call)
        if not continent:
            base_call = max(call.split("/"), key=len)
            continent =  CALL_INFO_BASIC.get_continent(base_call)
    except KeyError as e:
        continent = None
    # Couldn't get anything from basic call info database, try QRZCQ data
    if not continent:
        qrzcq_data = get_qrzcq_data_for_callsign(call)
        if qrzcq_data and qrzcq_data["continent"]:
            continent = qrzcq_data["continent"]
    return continent

# Infer a CQ zone from a callsign
def infer_cq_zone_from_callsign(call):
    try:
        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
        # callsign, assuming this will be the longest of any /-separated sections. Then if that doesn't provide data,
        # and we have QRZ data, try the same with that.
        cqz = CALL_INFO_BASIC.get_cqz(call)
        if not cqz:
            base_call = max(call.split("/"), key=len)
            cqz = CALL_INFO_BASIC.get_cqz(base_call)
    except KeyError as e:
        cqz = None
    # Couldn't get anything from basic call info database, try QRZ.com
    if not cqz:
        qrz_data = get_qrz_data_for_callsign(call)
        if qrz_data and "cqz" in qrz_data:
            cqz = qrz_data["cqz"]
    # Couldn't get anything from QRZ.com database, try QRZCQ data
    if not cqz:
        qrzcq_data = get_qrzcq_data_for_callsign(call)
        if qrzcq_data and qrzcq_data["cqz"]:
            cqz = qrzcq_data["cqz"]
    return cqz

# Infer a ITU zone from a callsign
def infer_itu_zone_from_callsign(call):
    try:
        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
        # callsign, assuming this will be the longest of any /-separated sections. Then if that doesn't provide data,
        # and we have QRZ data, try the same with that.
        ituz = CALL_INFO_BASIC.get_ituz(call)
        if not ituz:
            base_call = max(call.split("/"), key=len)
            ituz = CALL_INFO_BASIC.get_ituz(base_call)
    except KeyError as e:
        ituz = None
    # Couldn't get anything from basic call info database, try QRZ.com
    if not ituz:
        qrz_data = get_qrz_data_for_callsign(call)
        if qrz_data and "ituz" in qrz_data:
            ituz = qrz_data["ituz"]
    # Couldn't get anything from QRZ.com database, try QRZCQ data
    if not ituz:
        qrzcq_data = get_qrzcq_data_for_callsign(call)
        if qrzcq_data and qrzcq_data["ituz"]:
            ituz = qrzcq_data["ituz"]
    return ituz

# Utility method to get QRZ.com data from cache if possible, if not get it from the API and cache it
def get_qrz_data_for_callsign(call):
    # Fetch from cache if we can, otherwise fetch from the API and cache it
    qrz_data = QRZ_CALLSIGN_DATA_CACHE.get(call)
    if qrz_data:
        return qrz_data
    elif QRZ_AVAILABLE:
        try:
            data = LOOKUP_LIB_QRZ.lookup_callsign(callsign=call)
            QRZ_CALLSIGN_DATA_CACHE.add(call, data, expire=604800) # 1 week in seconds
            return data
        except KeyError:
            # QRZ had no info for the call, that's OK
            return None
    else:
        return None

# Utility method to get QRZCQ data from our constants table, if we can find it
def get_qrzcq_data_for_callsign(call):
    # Iterate in reverse order - see comments on the data structure itself
    for entry in reversed(QRZCQ_CALLSIGN_LOOKUP_DATA):
        if call.startswith(entry["prefix"]):
            return entry
    return None

# Infer an operator name from a callsign (requires QRZ.com)
def infer_name_from_callsign(call):
    data = get_qrz_data_for_callsign(call)
    if data and "fname" in data:
        name = data["fname"]
        if "name" in data:
            name = name + " " + data["name"]
        return name
    else:
        return None

# Infer a latitude and longitude from a callsign (requires QRZ.com)
def infer_latlon_from_callsign_qrz(call):
    data = get_qrz_data_for_callsign(call)
    if data and "latitude" in data and "longitude" in data:
        return [data["latitude"], data["longitude"]]
    else:
        return None

# Infer a grid locator from a callsign (requires QRZ.com)
def infer_grid_from_callsign_qrz(call):
    data = get_qrz_data_for_callsign(call)
    if data and "locator" in data:
        return data["locator"]
    else:
        return None

# Infer a latitude and longitude from a callsign (using DXCC, probably very inaccurate)
def infer_latlon_from_callsign_dxcc(call):
    try:
        data = CALL_INFO_BASIC.get_lat_long(call)
        if data and "latitude" in data and "longitude" in data:
            return [data["latitude"], data["longitude"]]
        else:
            return None
    except KeyError:
        return None

# Infer a grid locator from a callsign (using DXCC, probably very inaccurate)
def infer_grid_from_callsign_dxcc(call):
    latlon = infer_latlon_from_callsign_dxcc(call)
    return latlong_to_locator(latlon[0], latlon[1], 8)


# Infer a mode from the frequency (in Hz) according to the band plan. Just a guess really.
def infer_mode_from_frequency(freq):
    try:
        return freq_to_band(freq / 1000.0)["mode"]
    except KeyError:
        return None


# Convert objects to serialisable things. Used by JSON serialiser as a default when it encounters unserializable things.
# Just converts objects to dict. Try to avoid doing anything clever here when serialising spots, because we also need
# to receive spots without complex handling.
def serialize_everything(obj):
    return obj.__dict__