# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

from absl.testing import absltest
import numpy as np
import pyiree


def create_simple_mul_module():
  ctx = pyiree.CompilerContext()
  input_module = ctx.parse_asm("""
    func @simple_mul(%arg0: tensor<4xf32>, %arg1: tensor<4xf32>) -> tensor<4xf32>
          attributes { iree.module.export } {
        %0 = "xla_hlo.mul"(%arg0, %arg1) {name = "mul.1"} : (tensor<4xf32>, tensor<4xf32>) -> tensor<4xf32>
        return %0 : tensor<4xf32>
    }
    """)
  binary = input_module.compile_to_sequencer_blob()
  m = pyiree.binding.vm.create_module_from_blob(binary)
  return m


def create_host_buffer_view(context):
  b = context.allocate_device_visible(16)
  b.fill_zero(0, 16)
  bv = b.create_view(pyiree.binding.hal.Shape([4]), 4)
  print("BUFFER VIEW:", bv)
  return bv


class RuntimeTest(absltest.TestCase):

  def testModuleAndFunction(self):
    m = create_simple_mul_module()
    print("Module:", m)
    print("Module name:", m.name)
    self.assertEqual("module", m.name)

    # Function 0.
    f = m.lookup_function_by_ordinal(0)
    print("Function 0:", f)
    self.assertEqual("simple_mul", f.name)
    sig = f.signature
    self.assertEqual(2, sig.argument_count)
    self.assertEqual(1, sig.result_count)

    # Function 1.
    f = m.lookup_function_by_ordinal(1)
    self.assertIs(f, None)

    # By name.
    f = m.lookup_function_by_name("simple_mul")
    self.assertEqual("simple_mul", f.name)
    sig = f.signature
    self.assertEqual(2, sig.argument_count)
    self.assertEqual(1, sig.result_count)

    # By name not found.
    f = m.lookup_function_by_name("not_here")
    self.assertIs(f, None)

  def testInitialization(self):
    policy = pyiree.binding.rt.Policy()
    print("policy =", policy)
    instance = pyiree.binding.rt.Instance()
    print("instance =", instance)
    context = pyiree.binding.rt.Context(instance=instance, policy=policy)
    print("context =", context)
    context_id = context.context_id
    print("context_id =", context.context_id)
    self.assertGreater(context_id, 0)

  def testRegisterModule(self):
    policy = pyiree.binding.rt.Policy()
    instance = pyiree.binding.rt.Instance()
    context = pyiree.binding.rt.Context(instance=instance, policy=policy)
    m = create_simple_mul_module()
    context.register_module(m)
    self.assertIsNot(context.lookup_module_by_name("module"), None)
    self.assertIs(context.lookup_module_by_name("nothere"), None)
    f = context.resolve_function("module.simple_mul")
    self.assertIsNot(f, None)
    print("Resolved function:", f.name)
    self.assertIs(context.resolve_function("module.nothere"), None)

  def testInvoke(self):
    policy = pyiree.binding.rt.Policy()
    instance = pyiree.binding.rt.Instance()
    context = pyiree.binding.rt.Context(instance=instance, policy=policy)
    m = create_simple_mul_module()
    context.register_module(m)
    f = context.resolve_function("module.simple_mul")
    print("INVOKE F:", f)
    arg0 = context.wrap_for_input(np.array([1., 2., 3., 4.], dtype=np.float32))
    arg1 = context.wrap_for_input(np.array([4., 5., 6., 7.], dtype=np.float32))

    inv = context.invoke(f, policy, [arg0, arg1])
    print("Status:", inv.query_status())
    inv.await_ready()
    results = inv.results
    print("Results:", results)
    result = results[0].map()
    print("Mapped result:", result)
    result_ary = np.array(result, copy=False)
    print("NP result:", result_ary)
    self.assertEqual(4., result_ary[0])
    self.assertEqual(10., result_ary[1])
    self.assertEqual(18., result_ary[2])
    self.assertEqual(28., result_ary[3])


if __name__ == "__main__":
  absltest.main()