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# to you 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
#
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# "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.

Cowsay

import random
import time
from typing import Tuple

import cowsay

from burr.core import Action, Application, ApplicationBuilder, State, default, expr
from burr.core.action import action
from burr.lifecycle import PostRunStepHook

# create some hooks!
class PrintWhatTheCowSaid(PostRunStepHook):
    def post_run_step(self, *, state: "State", action: "Action", **future_kwargs):
        if action.name != "cow_should_say" and state["cow_said"] is not None:
            print(state["cow_said"])


class CowCantSpeakFast(PostRunStepHook):
    def __init__(self, sleep_time: float):
        super(PostRunStepHook, self).__init__()
        self.sleep_time = sleep_time

    def post_run_step(self, *, state: "State", action: "Action", **future_kwargs):
        if action.name != "cow_should_say":  # no need to print if we're not saying anything
            time.sleep(self.sleep_time)

# instantiate actions
@action(reads=[], writes=["cow_said"])
def cow_said(state: State, say_what: list[str]) -> Tuple[dict, State]:
    said = random.choice(say_what) if say_what is not None else None
    result = {"cow_said": cowsay.get_output_string("cow", said) if say_what is not None else None}
    return result, state.update(**result)


@action(reads=[], writes=["cow_should_speak"])
def cow_should_speak(state: State) -> Tuple[dict, State]:
    result = {"cow_should_speak": random.randint(0, 3) == 0}
    return result, state.update(**result)

# build application
hooks = [
    PrintWhatTheCowSaid(),
    CowCantSpeakFast(sleep_time=2.0),
]
        
app = (ApplicationBuilder()
    .with_state(cow_said=None)
    .with_actions(
        say_nothing=cow_said.bind(say_what=None),
        say_hello=cow_said.bind(
            say_what=["Hello world!", "What's up?", "Are you Aaron Burr, sir?"]
        ),
        cow_should_speak=cow_should_speak,
    )
    .with_transitions(
        ("cow_should_speak", "say_hello", expr("cow_should_speak")),
        ("say_hello", "cow_should_speak", default),
        ("cow_should_speak", "say_nothing", expr("not cow_should_speak")),
        ("say_nothing", "cow_should_speak", default),
    )
    .with_entrypoint("cow_should_speak")
    .with_hooks(*hooks)
    .build()
)

app.visualize(include_conditions=True)

# run things!
for i in range(0, 4):
    # step through 4 times
    a_obj, result, state = app.step()

# Run some more
for i in range(0, 4):
    # step through 4 times
    a_obj, result, state = app.step()

  __________
| What's up? |
  ==========
          \
           \
             ^__^
             (oo)\_______
             (__)\       )\/\
                 ||----w |
                 ||     ||
  __________
| What's up? |
  ==========
          \
           \
             ^__^
             (oo)\_______
             (__)\       )\/\
                 ||----w |
                 ||     ||