# Copyright 2021 kubeflow.org
#
# 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.

from typing import List

from kfp import dsl
from kfp.components import load_component_from_text
from kfp_tekton.tekton import CEL_ConditionOp
from kfp_tekton.compiler import TektonCompiler


class Coder:
    def empty(self):
        return ""


TektonCompiler._get_unique_id_code = Coder.empty

PrintOp = load_component_from_text("""
  name: print
  inputs:
    - {name: msg, type: String}
  outputs:
    - {name: output, type: String}
  implementation:
    container:
      image: alpine:3.6
      command:
        - sh
        - -c
        - |
          echo $0 | tee $1
        - { inputValue: msg }
        - { outputPath: output }
""")


class CEL_Condition(dsl.Condition):
  def __init__(self, pred: str, name: str = None):
    super().__init__(CEL_ConditionOp(pred).output == 'true', name)


def CEL_ExprOp(expr: str):
  return CEL_ConditionOp(expr)


@dsl.pipeline("double-recursion-test")
def double_recursion_test(array: List[int] = [3, 1, 4, 9, 2]):
  @dsl.graph_component
  def recur_a(i: int, li: List[int]):
    @dsl.graph_component
    def recur_b(j: int, until_b: int):
      print_op = PrintOp(f"Iter A: {i}, B: {j}")
      incr_j = CEL_ExprOp(f"{j} + 1").after(print_op).output
      with CEL_Condition(f"{incr_j} < {until_b}"):
        recur_b(incr_j, until_b)

    start_b = CEL_ExprOp("0").output
    end_b = CEL_ExprOp(f"{array}[{i}]").output
    with CEL_Condition(f"{start_b} < {end_b}"):
      b = recur_b(start_b, end_b)

    incr_i = CEL_ExprOp(f"{i} + 1").after(b).output
    with CEL_Condition(f"{incr_i} < size( {array} )"):
      recur_a(incr_i, array)

  start_a = CEL_ExprOp("0").output
  with CEL_Condition(f"{start_a} < size( {array} )"):
    recur_a(start_a, array)


if __name__ == '__main__':
  from kfp_tekton.compiler import TektonCompiler as Compiler
  Compiler().compile(double_recursion_test, __file__.replace('.py', '.yaml'))