import pytest

from cashu.core.base import TokenV3
from cashu.core.helpers import calculate_number_of_blank_outputs
from cashu.core.split import amount_split


def test_get_output_split():
    assert amount_split(13) == [1, 4, 8]


def test_tokenv3_get_amount():
    token_str = "cashuAeyJ0b2tlbiI6IFt7InByb29mcyI6IFt7ImlkIjogIkplaFpMVTZuQ3BSZCIsICJhbW91bnQiOiAyLCAic2VjcmV0IjogIjBFN2lDazRkVmxSZjVQRjFnNFpWMnciLCAiQyI6ICIwM2FiNTgwYWQ5NTc3OGVkNTI5NmY4YmVlNjU1ZGJkN2Q2NDJmNWQzMmRlOGUyNDg0NzdlMGI0ZDZhYTg2M2ZjZDUifSwgeyJpZCI6ICJKZWhaTFU2bkNwUmQiLCAiYW1vdW50IjogOCwgInNlY3JldCI6ICJzNklwZXh3SGNxcXVLZDZYbW9qTDJnIiwgIkMiOiAiMDIyZDAwNGY5ZWMxNmE1OGFkOTAxNGMyNTliNmQ2MTRlZDM2ODgyOWYwMmMzODc3M2M0NzIyMWY0OTYxY2UzZjIzIn1dLCAibWludCI6ICJodHRwOi8vbG9jYWxob3N0OjMzMzgifV19"
    token = TokenV3.deserialize(token_str)
    assert token.get_amount() == 10


def test_tokenv3_get_proofs():
    token_str = "cashuAeyJ0b2tlbiI6IFt7InByb29mcyI6IFt7ImlkIjogIkplaFpMVTZuQ3BSZCIsICJhbW91bnQiOiAyLCAic2VjcmV0IjogIjBFN2lDazRkVmxSZjVQRjFnNFpWMnciLCAiQyI6ICIwM2FiNTgwYWQ5NTc3OGVkNTI5NmY4YmVlNjU1ZGJkN2Q2NDJmNWQzMmRlOGUyNDg0NzdlMGI0ZDZhYTg2M2ZjZDUifSwgeyJpZCI6ICJKZWhaTFU2bkNwUmQiLCAiYW1vdW50IjogOCwgInNlY3JldCI6ICJzNklwZXh3SGNxcXVLZDZYbW9qTDJnIiwgIkMiOiAiMDIyZDAwNGY5ZWMxNmE1OGFkOTAxNGMyNTliNmQ2MTRlZDM2ODgyOWYwMmMzODc3M2M0NzIyMWY0OTYxY2UzZjIzIn1dLCAibWludCI6ICJodHRwOi8vbG9jYWxob3N0OjMzMzgifV19"
    token = TokenV3.deserialize(token_str)
    assert len(token.get_proofs()) == 2


def test_tokenv3_deserialize_serialize():
    token_str = "cashuAeyJ0b2tlbiI6IFt7InByb29mcyI6IFt7ImlkIjogIkplaFpMVTZuQ3BSZCIsICJhbW91bnQiOiAyLCAic2VjcmV0IjogIjBFN2lDazRkVmxSZjVQRjFnNFpWMnciLCAiQyI6ICIwM2FiNTgwYWQ5NTc3OGVkNTI5NmY4YmVlNjU1ZGJkN2Q2NDJmNWQzMmRlOGUyNDg0NzdlMGI0ZDZhYTg2M2ZjZDUifSwgeyJpZCI6ICJKZWhaTFU2bkNwUmQiLCAiYW1vdW50IjogOCwgInNlY3JldCI6ICJzNklwZXh3SGNxcXVLZDZYbW9qTDJnIiwgIkMiOiAiMDIyZDAwNGY5ZWMxNmE1OGFkOTAxNGMyNTliNmQ2MTRlZDM2ODgyOWYwMmMzODc3M2M0NzIyMWY0OTYxY2UzZjIzIn1dLCAibWludCI6ICJodHRwOi8vbG9jYWxob3N0OjMzMzgifV19"
    token = TokenV3.deserialize(token_str)
    assert token.serialize() == token_str


def test_tokenv3_deserialize_with_memo():
    token_str = "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"
    token = TokenV3.deserialize(token_str)
    assert token.serialize() == token_str
    assert token.memo == "Test memo"


def test_calculate_number_of_blank_outputs():
    # Example from NUT-08 specification.
    fee_reserve_sat = 1000
    expected_n_blank_outputs = 10
    n_blank_outputs = calculate_number_of_blank_outputs(fee_reserve_sat)
    assert n_blank_outputs == expected_n_blank_outputs


def test_calculate_number_of_blank_outputs_for_small_fee_reserve():
    # There should always be at least one blank output.
    fee_reserve_sat = 1
    expected_n_blank_outputs = 1
    n_blank_outputs = calculate_number_of_blank_outputs(fee_reserve_sat)
    assert n_blank_outputs == expected_n_blank_outputs


def test_calculate_number_of_blank_outputs_for_zero_fee_reserve():
    # Negative fee reserve is not supported.
    fee_reserve_sat = 0
    n_blank_outputs = calculate_number_of_blank_outputs(fee_reserve_sat)
    assert n_blank_outputs == 0


def test_calculate_number_of_blank_outputs_fails_for_negative_fee_reserve():
    # Negative fee reserve is not supported.
    fee_reserve_sat = -1
    with pytest.raises(AssertionError):
        _ = calculate_number_of_blank_outputs(fee_reserve_sat)