# Copyright 2018 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
#
#      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.

import os
import sys
import unittest
from pathlib import Path


from .. import components as comp
from ..components.structures import ComponentReference, ComponentSpec, ContainerSpec, GraphInputReference, GraphSpec, InputSpec, InputValuePlaceholder, GraphImplementation, OutputPathPlaceholder, OutputSpec, TaskOutputArgument, TaskSpec

from ..components._yaml_utils import load_yaml

class GraphComponentTestCase(unittest.TestCase):
    def test_handle_constructing_graph_component(self):
        task1 = TaskSpec(component_ref=ComponentReference(name='comp 1'), arguments={'in1 1': 11})
        task2 = TaskSpec(component_ref=ComponentReference(name='comp 2'), arguments={'in2 1': 21, 'in2 2': TaskOutputArgument.construct(task_id='task 1', output_name='out1 1')})
        task3 = TaskSpec(component_ref=ComponentReference(name='comp 3'), arguments={'in3 1': TaskOutputArgument.construct(task_id='task 2', output_name='out2 1'), 'in3 2': GraphInputReference(input_name='graph in 1').as_argument()})

        graph_component1 = ComponentSpec(
            inputs=[
                InputSpec(name='graph in 1'),
                InputSpec(name='graph in 2'),
            ],
            outputs=[
                OutputSpec(name='graph out 1'),
                OutputSpec(name='graph out 2'),
            ],
            implementation=GraphImplementation(graph=GraphSpec(
                tasks={
                    'task 1': task1,
                    'task 2': task2,
                    'task 3': task3,
                },
                output_values={
                    'graph out 1': TaskOutputArgument.construct(task_id='task 3', output_name='out3 1'),
                    'graph out 2': TaskOutputArgument.construct(task_id='task 1', output_name='out1 2'),
                }
            ))
        )

    def test_handle_parsing_graph_component(self):
        component_text = '''\
inputs:
- {name: graph in 1}
- {name: graph in 2}
outputs:
- {name: graph out 1}
- {name: graph out 2}
implementation:
  graph:
    tasks:
      task 1:
        componentRef: {name: Comp 1}
        arguments:
            in1 1: 11
      task 2:
        componentRef: {name: Comp 2}
        arguments:
            in2 1: 21
            in2 2: {taskOutput: {taskId: task 1, outputName: out1 1}}
      task 3:
        componentRef: {name: Comp 3}
        arguments:
            in3 1: {taskOutput: {taskId: task 2, outputName: out2 1}}
            in3 2: {graphInput: {inputName: graph in 1}}
    outputValues:
      graph out 1: {taskOutput: {taskId: task 3, outputName: out3 1}}
      graph out 2: {taskOutput: {taskId: task 1, outputName: out1 2}}
'''
        struct = load_yaml(component_text)
        ComponentSpec.from_dict(struct)

    def test_fail_on_cyclic_references(self):
        component_text = '''\
implementation:
  graph:
    tasks:
      task 1:
        componentRef: {name: Comp 1}
        arguments:
            in1 1: {taskOutput: {taskId: task 2, outputName: out2 1}}
      task 2:
        componentRef: {name: Comp 2}
        arguments:
            in2 1: {taskOutput: {taskId: task 1, outputName: out1 1}}
'''
        struct = load_yaml(component_text)
        with self.assertRaises(TypeError):
            ComponentSpec.from_dict(struct)

    def test_handle_parsing_predicates(self):
        component_text = '''\
implementation:
  graph:
    tasks:
      task 1:
        componentRef: {name: Comp 1}
      task 2:
        componentRef: {name: Comp 2}
        arguments:
            in2 1: 21
            in2 2: {taskOutput: {taskId: task 1, outputName: out1 1}}
        isEnabled:
            not:
                and:
                    op1:
                        '>':
                            op1: {taskOutput: {taskId: task 1, outputName: out1 1}}
                            op2: 0
                    op2:
                        '==':
                            op1: {taskOutput: {taskId: task 1, outputName: out1 2}}
                            op2: 'head'
'''
        struct = load_yaml(component_text)
        ComponentSpec.from_dict(struct)

    def test_handle_parsing_task_execution_options_caching_strategy(self):
        component_text = '''\
implementation:
  graph:
    tasks:
      task 1:
        componentRef: {name: Comp 1}
        executionOptions:
          cachingStrategy:
            maxCacheStaleness: P30D
'''
        struct = load_yaml(component_text)
        component_spec = ComponentSpec.from_dict(struct)
        self.assertEqual(component_spec.implementation.graph.tasks['task 1'].execution_options.caching_strategy.max_cache_staleness, 'P30D')

    def test_load_graph_component(self):
        component_text = '''\
inputs:
- {name: graph in 1}
- {name: graph in 2}
outputs:
- {name: graph out 1}
- {name: graph out 2}
- {name: graph out 3}
- {name: graph out 4}
implementation:
  graph:
    tasks:
      task 1:
        componentRef:
          spec:
            name: Component 1
            inputs:
            - {name: in1_1}
            outputs:
            - {name: out1_1}
            - {name: out1_2}
            implementation:
              container:
                image: busybox
                command: [sh, -c, 'echo "$0" > $1; echo "$0" > $2', {inputValue: in1_1}, {outputPath: out1_1}, {outputPath: out1_2}]
        arguments:
            in1_1: '11'
      task 2:
        componentRef:
          spec:
            name: Component 2
            inputs:
            - {name: in2_1}
            - {name: in2_2}
            outputs:
            - {name: out2_1}
            implementation:
              container:
                image: busybox
                command: [sh, -c, 'cat "$0" "$1" > $2', {inputValue: in2_1}, {inputValue: in2_2}, {outputPath: out2_1}]
        arguments:
            in2_1: '21'
            in2_2: {taskOutput: {taskId: task 1, outputName: out1_1}}
      task 3:
        componentRef:
          spec:
            name: Component 3
            inputs:
            - {name: in3_1}
            - {name: in3_2}
            outputs:
            - {name: out3_1}
            implementation:
              container:
                image: busybox
                command: [sh, -c, 'cat "$0" "$1" > $2', {inputValue: in3_1}, {inputValue: in3_2}, {outputPath: out3_1}]
        arguments:
            in3_1: {taskOutput: {taskId: task 2, outputName: out2_1}}
            in3_2: {graphInput: {inputName: graph in 1}}
    outputValues:
      graph out 1: {taskOutput: {taskId: task 3, outputName: out3_1}}
      graph out 2: {taskOutput: {taskId: task 1, outputName: out1_2}}
      graph out 3: {graphInput: {inputName: graph in 2}}
      graph out 4: '42'
'''
        op = comp.load_component_from_text(component_text)
        task = op('graph 1', 'graph 2')
        self.assertEqual(len(task.outputs), 4)

    def test_load_nested_graph_components(self):
        component_text = '''\
inputs:
- {name: graph in 1}
- {name: graph in 2}
outputs:
- {name: graph out 1}
- {name: graph out 2}
- {name: graph out 3}
- {name: graph out 4}
implementation:
  graph:
    tasks:
      task 1:
        componentRef:
          spec:
            name: Component 1
            inputs:
            - {name: in1_1}
            outputs:
            - {name: out1_1}
            - {name: out1_2}
            implementation:
              container:
                image: busybox
                command: [sh, -c, 'echo "$0" > $1; echo "$0" > $2', {inputValue: in1_1}, {outputPath: out1_1}, {outputPath: out1_2}]
        arguments:
            in1_1: '11'
      task 2:
        componentRef:
          spec:
            name: Component 2
            inputs:
            - {name: in2_1}
            - {name: in2_2}
            outputs:
            - {name: out2_1}
            implementation:
              container:
                image: busybox
                command: [sh, -c, 'cat "$0" "$1" > $2', {inputValue: in2_1}, {inputValue: in2_2}, {outputPath: out2_1}]
        arguments:
            in2_1: '21'
            in2_2: {taskOutput: {taskId: task 1, outputName: out1_1}}
      task 3:
        componentRef:
          spec:
            inputs:
            - {name: in3_1}
            - {name: in3_2}
            outputs:
            - {name: out3_1}
            implementation:
              graph:
                tasks:
                  graph subtask:
                    componentRef:
                      spec:
                        name: Component 3
                        inputs:
                        - {name: in3_1}
                        - {name: in3_2}
                        outputs:
                        - {name: out3_1}
                        implementation:
                          container:
                            image: busybox
                            command: [sh, -c, 'cat "$0" "$1" > $2', {inputValue: in3_1}, {inputValue: in3_2}, {outputPath: out3_1}]
                    arguments:
                      in3_1: {graphInput: {inputName: in3_1}}
                      in3_2: {graphInput: {inputName: in3_1}}
                outputValues:
                  out3_1: {taskOutput: {taskId: graph subtask, outputName: out3_1}}
        arguments:
          in3_1: {taskOutput: {taskId: task 2, outputName: out2_1}}
          in3_2: {graphInput: {inputName: graph in 1}}
    outputValues:
      graph out 1: {taskOutput: {taskId: task 3, outputName: out3_1}}
      graph out 2: {taskOutput: {taskId: task 1, outputName: out1_2}}
      graph out 3: {graphInput: {inputName: graph in 2}}
      graph out 4: '42'
'''
        op = comp.load_component_from_text(component_text)
        old_value = comp._components._always_expand_graph_components = True
        try:
            task = op('graph 1', 'graph 2')
        finally:
            comp._components._always_expand_graph_components = old_value
        self.assertIn('out3_1', str(task.outputs['graph out 1'])) # Checks that the outputs coming from tasks in nested subgraphs are properly resolved.
        self.assertIn('out1_2', str(task.outputs['graph out 2']))
        self.assertEqual(task.outputs['graph out 3'], 'graph 2')
        self.assertEqual(task.outputs['graph out 4'], '42')

#TODO: Test task name conversion to Argo-compatible names

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