from itertools import product

import pytest
import torch
from torch_sparse.tensor import SparseTensor

from .utils import dtypes, devices


@pytest.mark.parametrize('dtype,device', product(dtypes, devices))
def test_eye(dtype, device):
    options = torch.tensor(0, dtype=dtype, device=device)

    mat = SparseTensor.eye(3, options=options)
    assert mat.storage.sparse_sizes() == (3, 3)
    assert mat.storage.row().tolist() == [0, 1, 2]
    assert mat.storage.rowptr().tolist() == [0, 1, 2, 3]
    assert mat.storage.col().tolist() == [0, 1, 2]
    assert mat.storage.value().tolist() == [1, 1, 1]
    assert mat.storage.num_cached_keys() == 0

    mat = SparseTensor.eye(3, options=options, has_value=False)
    assert mat.storage.sparse_sizes() == (3, 3)
    assert mat.storage.row().tolist() == [0, 1, 2]
    assert mat.storage.rowptr().tolist() == [0, 1, 2, 3]
    assert mat.storage.col().tolist() == [0, 1, 2]
    assert mat.storage.value() is None
    assert mat.storage.num_cached_keys() == 0

    mat = SparseTensor.eye(3, 4, options=options, fill_cache=True)
    assert mat.storage.sparse_sizes() == (3, 4)
    assert mat.storage.row().tolist() == [0, 1, 2]
    assert mat.storage.rowptr().tolist() == [0, 1, 2, 3]
    assert mat.storage.col().tolist() == [0, 1, 2]
    assert mat.storage.num_cached_keys() == 5
    assert mat.storage.rowcount().tolist() == [1, 1, 1]
    assert mat.storage.colptr().tolist() == [0, 1, 2, 3, 3]
    assert mat.storage.colcount().tolist() == [1, 1, 1, 0]
    assert mat.storage.csr2csc().tolist() == [0, 1, 2]
    assert mat.storage.csc2csr().tolist() == [0, 1, 2]

    mat = SparseTensor.eye(4, 3, options=options, fill_cache=True)
    assert mat.storage.sparse_sizes() == (4, 3)
    assert mat.storage.row().tolist() == [0, 1, 2]
    assert mat.storage.rowptr().tolist() == [0, 1, 2, 3, 3]
    assert mat.storage.col().tolist() == [0, 1, 2]
    assert mat.storage.num_cached_keys() == 5
    assert mat.storage.rowcount().tolist() == [1, 1, 1, 0]
    assert mat.storage.colptr().tolist() == [0, 1, 2, 3]
    assert mat.storage.colcount().tolist() == [1, 1, 1]
    assert mat.storage.csr2csc().tolist() == [0, 1, 2]
    assert mat.storage.csc2csr().tolist() == [0, 1, 2]