import unittest
import numpy as np
from tinygrad import Tensor
from tinygrad.dtype import dtypes
from tinygrad.uop.ops import UOp

class TestCall(unittest.TestCase):
  def test_call_plus(self):
    a = Tensor.randn(10, 10)
    b = Tensor.randn(10, 10)
    Tensor.realize(a,b)

    # we define a plus function
    plus_fxn = UOp.param(0, dtypes.float, (10,10)) + UOp.param(1, dtypes.float, (10,10))

    c = Tensor.call(a, b, fxn=plus_fxn)
    np.testing.assert_equal(c.numpy(), (a+b).numpy())

  def test_call_plus_backward(self):
    a = Tensor.ones(10, 10, requires_grad=True)
    b = Tensor.ones(10, 10, requires_grad=True)

    (a+b).mean().backward()
    gt_a_grad = a.grad.numpy()
    gt_b_grad = b.grad.numpy()
    a.grad, b.grad = None, None

    # this is the gradient for +
    def grad_fxn(grad:UOp, call:UOp): return (grad, grad)

    # we define a plus function
    plus_fxn = UOp.param(0, dtypes.float, (10,10)) + UOp.param(1, dtypes.float, (10,10))
    c = Tensor.call(a, b, fxn=plus_fxn, grad_fxn=grad_fxn)
    c.mean().backward()

    np.testing.assert_allclose(a.grad.numpy(), gt_a_grad, rtol=1e-5)
    np.testing.assert_allclose(b.grad.numpy(), gt_b_grad, rtol=1e-5)

  def test_call_plus_backward_auto(self):
    a = Tensor.ones(10, 10, requires_grad=True)
    b = Tensor.ones(10, 10, requires_grad=True)

    (a+b).mean().backward()
    gt_a_grad = a.grad.numpy()
    gt_b_grad = b.grad.numpy()
    a.grad, b.grad = None, None

    plus_fxn = UOp.param(0, dtypes.float, (10,10)) + UOp.param(1, dtypes.float, (10,10))
    c = Tensor.call(a, b, fxn=plus_fxn)
    c.mean().backward()

    np.testing.assert_allclose(a.grad.numpy(), gt_a_grad, rtol=1e-5)
    np.testing.assert_allclose(b.grad.numpy(), gt_b_grad, rtol=1e-5)

  def test_call_gemm(self):
    M, K, N = 4, 8, 4
    a = Tensor.randn(M, K)
    b = Tensor.randn(K, N)
    Tensor.realize(a, b)
    c = Tensor.call(a, b, fxn=a.as_param(0) @ b.as_param(1))
    np.testing.assert_allclose(c.numpy(), a.numpy() @ b.numpy(), rtol=1e-5, atol=1e-6)

  @unittest.skip("needs GEMM on mixins")
  def test_call_gemm_uop(self):
    M, K, N = 4, 8, 4
    a = Tensor.randn(M, K)
    b = Tensor.randn(K, N)
    Tensor.realize(a, b)

    # we define a gemm function
    x = UOp.param(0, dtypes.float, shape=(M, K))
    y = UOp.param(1, dtypes.float, shape=(K, N))
    c = Tensor.call(a, b, fxn=x@y)

    np.testing.assert_allclose(c.numpy(), a.numpy() @ b.numpy(), rtol=1e-5, atol=1e-6)

  def test_call_complex_backward_auto(self):
    # complex chain: (a*b + a).exp2() * b.reciprocal() - tests mul, add, exp2, reciprocal, param reuse
    a = Tensor.randn(10, 10, requires_grad=True)
    b = Tensor.randn(10, 10, requires_grad=True) + 2  # avoid div by zero
    Tensor.realize(a, b)

    ((a*b + a).exp2() * b.reciprocal()).mean().backward()
    gt_a_grad, gt_b_grad = a.grad.numpy(), b.grad.numpy()
    a.grad, b.grad = None, None

    p0, p1 = UOp.param(0, dtypes.float, (10,10)), UOp.param(1, dtypes.float, (10,10))
    complex_fxn = (p0*p1 + p0).exp2() * p1.reciprocal()
    c = Tensor.call(a, b, fxn=complex_fxn)
    c.mean().backward()

    np.testing.assert_allclose(a.grad.numpy(), gt_a_grad, rtol=1e-5)
    np.testing.assert_allclose(b.grad.numpy(), gt_b_grad, rtol=1e-5)

if __name__ == '__main__':
  unittest.main()