# Copyright 2020 The MediaPipe Authors.
#
# 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
#
#      http://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.

"""Tests for mediapipe.python._framework_bindings.calculator_graph."""

from absl.testing import absltest

from google.protobuf import text_format
from mediapipe.framework import calculator_pb2
from mediapipe.python import packet_creator
from mediapipe.python import packet_getter
from mediapipe.python._framework_bindings import calculator_graph
from mediapipe.python._framework_bindings import validated_graph_config

CalculatorGraph = calculator_graph.CalculatorGraph
ValidatedGraphConfig = validated_graph_config.ValidatedGraphConfig


class GraphTest(absltest.TestCase):

  def test_invalid_binary_graph_file(self):
    with self.assertRaisesRegex(
        FileNotFoundError,
        '(No such file or directory|The path does not exist)'):
      CalculatorGraph(binary_graph_path='/tmp/abc.binarypb')

  def test_invalid_node_config(self):
    text_config = """
      node {
        calculator: 'PassThroughCalculator'
        input_stream: 'in'
        input_stream: 'in'
        output_stream: 'out'
      }
    """
    config_proto = calculator_pb2.CalculatorGraphConfig()
    text_format.Parse(text_config, config_proto)
    with self.assertRaisesRegex(
        ValueError,
        'Input and output streams to PassThroughCalculator must use matching tags and indexes.'
    ):
      CalculatorGraph(graph_config=config_proto)

  def test_invalid_calculator_type(self):
    text_config = """
      node {
        calculator: 'SomeUnknownCalculator'
        input_stream: 'in'
        output_stream: 'out'
      }
    """
    config_proto = calculator_pb2.CalculatorGraphConfig()
    text_format.Parse(text_config, config_proto)
    with self.assertRaisesRegex(
        RuntimeError, 'Unable to find Calculator \"SomeUnknownCalculator\"'):
      CalculatorGraph(graph_config=config_proto)

  def test_graph_initialized_with_proto_config(self):
    text_config = """
      max_queue_size: 1
      input_stream: 'in'
      output_stream: 'out'
      node {
        calculator: 'PassThroughCalculator'
        input_stream: 'in'
        output_stream: 'out'
      }
    """
    config_proto = calculator_pb2.CalculatorGraphConfig()
    text_format.Parse(text_config, config_proto)
    graph = CalculatorGraph(graph_config=config_proto)

    hello_world_packet = packet_creator.create_string('hello world')
    out = []
    graph = CalculatorGraph(graph_config=config_proto)
    graph.observe_output_stream('out', lambda _, packet: out.append(packet))
    graph.start_run()
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet, timestamp=0)
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet.at(1))
    graph.close()
    self.assertEqual(
        graph.graph_input_stream_add_mode,
        calculator_graph.GraphInputStreamAddMode.WAIT_TILL_NOT_FULL)
    self.assertEqual(graph.max_queue_size, 1)
    self.assertFalse(graph.has_error())
    self.assertLen(out, 2)
    self.assertEqual(out[0].timestamp, 0)
    self.assertEqual(out[1].timestamp, 1)
    self.assertEqual(packet_getter.get_str(out[0]), 'hello world')
    self.assertEqual(packet_getter.get_str(out[1]), 'hello world')

  def test_graph_initialized_with_text_config(self):
    text_config = """
      max_queue_size: 1
      input_stream: 'in'
      output_stream: 'out'
      node {
        calculator: 'PassThroughCalculator'
        input_stream: 'in'
        output_stream: 'out'
      }
    """

    hello_world_packet = packet_creator.create_string('hello world')
    out = []
    graph = CalculatorGraph(graph_config=text_config)
    graph.observe_output_stream('out', lambda _, packet: out.append(packet))
    graph.start_run()
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet.at(0))
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet, timestamp=1)
    graph.close()
    self.assertEqual(
        graph.graph_input_stream_add_mode,
        calculator_graph.GraphInputStreamAddMode.WAIT_TILL_NOT_FULL)
    self.assertEqual(graph.max_queue_size, 1)
    self.assertFalse(graph.has_error())
    self.assertLen(out, 2)
    self.assertEqual(out[0].timestamp, 0)
    self.assertEqual(out[1].timestamp, 1)
    self.assertEqual(packet_getter.get_str(out[0]), 'hello world')
    self.assertEqual(packet_getter.get_str(out[1]), 'hello world')

  def test_graph_validation_and_initialization(self):
    text_config = """
      max_queue_size: 1
      input_stream: 'in'
      output_stream: 'out'
      node {
        calculator: 'PassThroughCalculator'
        input_stream: 'in'
        output_stream: 'out'
      }
    """

    hello_world_packet = packet_creator.create_string('hello world')
    out = []
    validated_graph = ValidatedGraphConfig()
    self.assertFalse(validated_graph.initialized())
    validated_graph.initialize(graph_config=text_config)
    self.assertTrue(validated_graph.initialized())

    graph = CalculatorGraph(validated_graph_config=validated_graph)
    graph.observe_output_stream('out', lambda _, packet: out.append(packet))
    graph.start_run()
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet.at(0))
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet, timestamp=1)
    graph.close()
    self.assertEqual(
        graph.graph_input_stream_add_mode,
        calculator_graph.GraphInputStreamAddMode.WAIT_TILL_NOT_FULL)
    self.assertEqual(graph.max_queue_size, 1)
    self.assertFalse(graph.has_error())
    self.assertLen(out, 2)
    self.assertEqual(out[0].timestamp, 0)
    self.assertEqual(out[1].timestamp, 1)
    self.assertEqual(packet_getter.get_str(out[0]), 'hello world')
    self.assertEqual(packet_getter.get_str(out[1]), 'hello world')

  def test_insert_packets_with_same_timestamp(self):
    text_config = """
      max_queue_size: 1
      input_stream: 'in'
      output_stream: 'out'
      node {
        calculator: 'PassThroughCalculator'
        input_stream: 'in'
        output_stream: 'out'
      }
    """
    config_proto = calculator_pb2.CalculatorGraphConfig()
    text_format.Parse(text_config, config_proto)

    hello_world_packet = packet_creator.create_string('hello world')
    out = []
    graph = CalculatorGraph(graph_config=config_proto)
    graph.observe_output_stream('out', lambda _, packet: out.append(packet))
    graph.start_run()
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet.at(0))
    graph.wait_until_idle()
    graph.add_packet_to_input_stream(
        stream='in', packet=hello_world_packet.at(0))
    with self.assertRaisesRegex(
        ValueError, 'Current minimum expected timestamp is 1 but received 0.'):
      graph.wait_until_idle()

  def test_side_packet_graph(self):
    text_config = """
      node {
        calculator: 'StringToUint64Calculator'
        input_side_packet: "string"
        output_side_packet: "number"
      }
    """
    config_proto = calculator_pb2.CalculatorGraphConfig()
    text_format.Parse(text_config, config_proto)
    graph = CalculatorGraph(graph_config=config_proto)
    graph.start_run(
        input_side_packets={'string': packet_creator.create_string('42')})
    graph.wait_until_done()
    self.assertFalse(graph.has_error())
    self.assertEqual(
        packet_getter.get_uint(graph.get_output_side_packet('number')), 42)

  def test_sequence_input(self):
    text_config = """
      max_queue_size: 1
      input_stream: 'in'
      output_stream: 'out'
      node {
        calculator: 'PassThroughCalculator'
        input_stream: 'in'
        output_stream: 'out'
      }
    """
    hello_world_packet = packet_creator.create_string('hello world')
    out = []
    graph = CalculatorGraph(graph_config=text_config)
    graph.observe_output_stream('out', lambda _, packet: out.append(packet))
    graph.start_run()

    sequence_size = 1000
    for i in range(sequence_size):
      graph.add_packet_to_input_stream(
          stream='in', packet=hello_world_packet, timestamp=i)
    graph.wait_until_idle()
    self.assertLen(out, sequence_size)
    for i in range(sequence_size):
      self.assertEqual(out[i].timestamp, i)
      self.assertEqual(packet_getter.get_str(out[i]), 'hello world')


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