from trezor import wire
from trezor.messages import InputScriptType
from trezor.messages.HDNodeType import HDNodeType
from trezor.messages.PublicKey import PublicKey

from apps.common import coins, layout
from apps.common.keychain import get_keychain

if False:
    from trezor.messages.GetPublicKey import GetPublicKey


async def get_public_key(ctx: wire.Context, msg: GetPublicKey) -> PublicKey:
    coin_name = msg.coin_name or "Bitcoin"
    script_type = msg.script_type or InputScriptType.SPENDADDRESS
    coin = coins.by_name(coin_name)
    curve_name = msg.ecdsa_curve_name or coin.curve_name

    keychain = await get_keychain(ctx, curve_name, [[]])

    node = keychain.derive(msg.address_n)

    if (
        script_type in [InputScriptType.SPENDADDRESS, InputScriptType.SPENDMULTISIG]
        and coin.xpub_magic is not None
    ):
        node_xpub = node.serialize_public(coin.xpub_magic)
    elif (
        coin.segwit
        and script_type == InputScriptType.SPENDP2SHWITNESS
        and coin.xpub_magic_segwit_p2sh is not None
    ):
        node_xpub = node.serialize_public(coin.xpub_magic_segwit_p2sh)
    elif (
        coin.segwit
        and script_type == InputScriptType.SPENDWITNESS
        and coin.xpub_magic_segwit_native is not None
    ):
        node_xpub = node.serialize_public(coin.xpub_magic_segwit_native)
    else:
        raise wire.DataError("Invalid combination of coin and script_type")

    pubkey = node.public_key()
    if pubkey[0] == 1:
        pubkey = b"\x00" + pubkey[1:]
    node_type = HDNodeType(
        depth=node.depth(),
        child_num=node.child_num(),
        fingerprint=node.fingerprint(),
        chain_code=node.chain_code(),
        public_key=pubkey,
    )

    if msg.show_display:
        await layout.show_pubkey(ctx, pubkey)

    return PublicKey(node=node_type, xpub=node_xpub)