import os
from copy import deepcopy

import pytest

from lightning_app import LightningApp, LightningFlow, LightningWork
from lightning_app.runners import MultiProcessRuntime, SingleProcessRuntime
from lightning_app.storage.payload import Payload
from lightning_app.structures import Dict, List
from lightning_app.testing.helpers import EmptyFlow
from lightning_app.utilities.enum import CacheCallsKeys, WorkStageStatus


def test_dict():
    class WorkA(LightningWork):
        def __init__(self):
            super().__init__(port=1)
            self.c = 0

        def run(self):
            pass

    class A(LightningFlow):
        def __init__(self):
            super().__init__()
            self.dict = Dict(**{"work_a": WorkA(), "work_b": WorkA(), "work_c": WorkA(), "work_d": WorkA()})

        def run(self):
            pass

    flow = A()

    # TODO: these assertions are wrong, the works are getting added under "flows" instead of "works"
    # state
    assert len(flow.state["structures"]["dict"]["works"]) == len(flow.dict) == 4
    assert list(flow.state["structures"]["dict"]["works"].keys()) == ["work_a", "work_b", "work_c", "work_d"]
    assert all(
        flow.state["structures"]["dict"]["works"][f"work_{k}"]["vars"]
        == {
            "c": 0,
            "_url": "",
            "_future_url": "",
            "_port": 1,
            "_host": "127.0.0.1",
            "_paths": {},
            "_restarting": False,
            "_internal_ip": "",
            "_cloud_compute": {
                "type": "__cloud_compute__",
                "name": "default",
                "disk_size": 0,
                "idle_timeout": None,
                "mounts": None,
                "shm_size": 0,
                "_internal_id": "default",
            },
        }
        for k in ("a", "b", "c", "d")
    )
    assert all(
        flow.state["structures"]["dict"]["works"][f"work_{k}"]["calls"] == {CacheCallsKeys.LATEST_CALL_HASH: None}
        for k in ("a", "b", "c", "d")
    )
    assert all(flow.state["structures"]["dict"]["works"][f"work_{k}"]["changes"] == {} for k in ("a", "b", "c", "d"))

    # state_vars
    assert len(flow.state_vars["structures"]["dict"]["works"]) == len(flow.dict) == 4
    assert list(flow.state_vars["structures"]["dict"]["works"].keys()) == ["work_a", "work_b", "work_c", "work_d"]
    assert all(
        flow.state_vars["structures"]["dict"]["works"][f"work_{k}"]["vars"]
        == {
            "c": 0,
            "_url": "",
            "_future_url": "",
            "_port": 1,
            "_host": "127.0.0.1",
            "_paths": {},
            "_restarting": False,
            "_internal_ip": "",
            "_cloud_compute": {
                "type": "__cloud_compute__",
                "name": "default",
                "disk_size": 0,
                "idle_timeout": None,
                "mounts": None,
                "shm_size": 0,
                "_internal_id": "default",
            },
        }
        for k in ("a", "b", "c", "d")
    )

    # state_with_changes
    assert len(flow.state_with_changes["structures"]["dict"]["works"]) == len(flow.dict) == 4
    assert list(flow.state_with_changes["structures"]["dict"]["works"].keys()) == [
        "work_a",
        "work_b",
        "work_c",
        "work_d",
    ]
    assert all(
        flow.state_with_changes["structures"]["dict"]["works"][f"work_{k}"]["vars"]
        == {
            "c": 0,
            "_url": "",
            "_future_url": "",
            "_port": 1,
            "_host": "127.0.0.1",
            "_paths": {},
            "_restarting": False,
            "_internal_ip": "",
            "_cloud_compute": {
                "type": "__cloud_compute__",
                "name": "default",
                "disk_size": 0,
                "idle_timeout": None,
                "mounts": None,
                "shm_size": 0,
                "_internal_id": "default",
            },
        }
        for k in ("a", "b", "c", "d")
    )
    assert all(
        flow.state_with_changes["structures"]["dict"]["works"][f"work_{k}"]["calls"]
        == {CacheCallsKeys.LATEST_CALL_HASH: None}
        for k in ("a", "b", "c", "d")
    )
    assert all(
        flow.state_with_changes["structures"]["dict"]["works"][f"work_{k}"]["changes"] == {}
        for k in ("a", "b", "c", "d")
    )

    # set_state
    state = deepcopy(flow.state)
    state["structures"]["dict"]["works"]["work_b"]["vars"]["c"] = 1
    flow.set_state(state)
    assert flow.dict["work_b"].c == 1


def test_dict_name():
    d = Dict(a=EmptyFlow(), b=EmptyFlow())
    assert d.name == "root"
    assert d["a"].name == "root.a"
    assert d["b"].name == "root.b"

    class RootFlow(LightningFlow):
        def __init__(self):
            super().__init__()
            self.dict = Dict(x=EmptyFlow(), y=EmptyFlow())

        def run(self):
            pass

    root = RootFlow()
    assert root.name == "root"
    assert root.dict.name == "root.dict"
    assert root.dict["x"].name == "root.dict.x"
    assert root.dict["y"].name == "root.dict.y"


def test_list():
    class WorkA(LightningWork):
        def __init__(self):
            super().__init__(port=1)
            self.c = 0

        def run(self):
            pass

    class A(LightningFlow):
        def __init__(self):
            super().__init__()
            self.list = List(WorkA(), WorkA(), WorkA(), WorkA())

        def run(self):
            pass

    flow = A()

    # TODO: these assertions are wrong, the works are getting added under "flows" instead of "works"
    # state
    assert len(flow.state["structures"]["list"]["works"]) == len(flow.list) == 4
    assert list(flow.state["structures"]["list"]["works"].keys()) == ["0", "1", "2", "3"]
    assert all(
        flow.state["structures"]["list"]["works"][str(i)]["vars"]
        == {
            "c": 0,
            "_url": "",
            "_future_url": "",
            "_port": 1,
            "_host": "127.0.0.1",
            "_paths": {},
            "_restarting": False,
            "_internal_ip": "",
            "_cloud_compute": {
                "type": "__cloud_compute__",
                "name": "default",
                "disk_size": 0,
                "idle_timeout": None,
                "mounts": None,
                "shm_size": 0,
                "_internal_id": "default",
            },
        }
        for i in range(4)
    )
    assert all(
        flow.state["structures"]["list"]["works"][str(i)]["calls"] == {CacheCallsKeys.LATEST_CALL_HASH: None}
        for i in range(4)
    )
    assert all(flow.state["structures"]["list"]["works"][str(i)]["changes"] == {} for i in range(4))

    # state_vars
    assert len(flow.state_vars["structures"]["list"]["works"]) == len(flow.list) == 4
    assert list(flow.state_vars["structures"]["list"]["works"].keys()) == ["0", "1", "2", "3"]
    assert all(
        flow.state_vars["structures"]["list"]["works"][str(i)]["vars"]
        == {
            "c": 0,
            "_url": "",
            "_future_url": "",
            "_port": 1,
            "_host": "127.0.0.1",
            "_paths": {},
            "_restarting": False,
            "_internal_ip": "",
            "_cloud_compute": {
                "type": "__cloud_compute__",
                "name": "default",
                "disk_size": 0,
                "idle_timeout": None,
                "mounts": None,
                "shm_size": 0,
                "_internal_id": "default",
            },
        }
        for i in range(4)
    )

    # state_with_changes
    assert len(flow.state_with_changes["structures"]["list"]["works"]) == len(flow.list) == 4
    assert list(flow.state_with_changes["structures"]["list"]["works"].keys()) == ["0", "1", "2", "3"]
    assert all(
        flow.state_with_changes["structures"]["list"]["works"][str(i)]["vars"]
        == {
            "c": 0,
            "_url": "",
            "_future_url": "",
            "_port": 1,
            "_host": "127.0.0.1",
            "_paths": {},
            "_restarting": False,
            "_internal_ip": "",
            "_cloud_compute": {
                "type": "__cloud_compute__",
                "name": "default",
                "disk_size": 0,
                "idle_timeout": None,
                "mounts": None,
                "shm_size": 0,
                "_internal_id": "default",
            },
        }
        for i in range(4)
    )
    assert all(
        flow.state_with_changes["structures"]["list"]["works"][str(i)]["calls"]
        == {CacheCallsKeys.LATEST_CALL_HASH: None}
        for i in range(4)
    )
    assert all(flow.state_with_changes["structures"]["list"]["works"][str(i)]["changes"] == {} for i in range(4))

    # set_state
    state = deepcopy(flow.state)
    state["structures"]["list"]["works"]["0"]["vars"]["c"] = 1
    flow.set_state(state)
    assert flow.list[0].c == 1


def test_list_name():
    lst = List(EmptyFlow(), EmptyFlow())
    assert lst.name == "root"
    assert lst[0].name == "root.0"
    assert lst[1].name == "root.1"

    class RootFlow(LightningFlow):
        def __init__(self):
            super().__init__()
            self.list = List(EmptyFlow(), EmptyFlow())

        def run(self):
            pass

    root = RootFlow()
    assert root.name == "root"
    assert root.list.name == "root.list"
    assert root.list[0].name == "root.list.0"
    assert root.list[1].name == "root.list.1"


class CounterWork(LightningWork):
    def __init__(self, cache_calls, parallel=False):
        super().__init__(cache_calls=cache_calls, parallel=parallel)
        self.counter = 0

    def run(self):
        self.counter += 1


@pytest.mark.skipif(True, reason="tchaton: Resolve this test.")
@pytest.mark.parametrize("runtime_cls", [MultiProcessRuntime, SingleProcessRuntime])
@pytest.mark.parametrize("run_once_iterable", [False, True])
@pytest.mark.parametrize("cache_calls", [False, True])
@pytest.mark.parametrize("use_list", [False, True])
def test_structure_with_iterate_and_fault_tolerance(runtime_cls, run_once_iterable, cache_calls, use_list):
    class DummyFlow(LightningFlow):
        def __init__(self):
            super().__init__()
            self.counter = 0

        def run(self):
            pass

    class RootFlow(LightningFlow):
        def __init__(self, use_list, run_once_iterable, cache_calls):
            super().__init__()
            self.looping = 0
            self.run_once_iterable = run_once_iterable
            self.restarting = False
            if use_list:
                self.iter = List(
                    CounterWork(cache_calls),
                    CounterWork(cache_calls),
                    CounterWork(cache_calls),
                    CounterWork(cache_calls),
                    DummyFlow(),
                )
            else:
                self.iter = Dict(
                    **{
                        "0": CounterWork(cache_calls),
                        "1": CounterWork(cache_calls),
                        "2": CounterWork(cache_calls),
                        "3": CounterWork(cache_calls),
                        "4": DummyFlow(),
                    }
                )

        def run(self):
            for work_idx, work in self.experimental_iterate(enumerate(self.iter), run_once=self.run_once_iterable):
                if not self.restarting and work_idx == 1:
                    # gives time to the delta to be sent.
                    self._exit()
                if isinstance(work, str) and isinstance(self.iter, Dict):
                    work = self.iter[work]
                work.run()
            if self.looping > 0:
                self._exit()
            self.looping += 1

    app = LightningApp(RootFlow(use_list, run_once_iterable, cache_calls))
    runtime_cls(app, start_server=False).dispatch()
    assert app.root.iter[0 if use_list else "0"].counter == 1
    assert app.root.iter[1 if use_list else "1"].counter == 0
    assert app.root.iter[2 if use_list else "2"].counter == 0
    assert app.root.iter[3 if use_list else "3"].counter == 0

    app = LightningApp(RootFlow(use_list, run_once_iterable, cache_calls))
    app.root.restarting = True
    runtime_cls(app, start_server=False).dispatch()

    if run_once_iterable:
        expected_value = 1
    else:
        expected_value = 1 if cache_calls else 2
    assert app.root.iter[0 if use_list else "0"].counter == expected_value
    assert app.root.iter[1 if use_list else "1"].counter == expected_value
    assert app.root.iter[2 if use_list else "2"].counter == expected_value
    assert app.root.iter[3 if use_list else "3"].counter == expected_value


class CheckpointCounter(LightningWork):
    def __init__(self):
        super().__init__(cache_calls=False)
        self.counter = 0

    def run(self):
        self.counter += 1


class CheckpointFlow(LightningFlow):
    def __init__(self, collection, depth=0, exit=11):
        super().__init__()
        self.depth = depth
        self.exit = exit
        if depth == 0:
            self.counter = 0

        if depth >= 4:
            self.collection = collection
        else:
            self.flow = CheckpointFlow(collection, depth + 1)

    def run(self):
        if hasattr(self, "counter"):
            self.counter += 1
            if self.counter >= self.exit:
                self._exit()
        if self.depth >= 4:
            self.collection.run()
        else:
            self.flow.run()


class SimpleCounterWork(LightningWork):
    def __init__(self):
        super().__init__()
        self.counter = 0

    def run(self):
        self.counter += 1


class FlowDict(LightningFlow):
    def __init__(self):
        super().__init__()
        self.dict = Dict()

    def run(self):
        if "w" not in self.dict:
            self.dict["w"] = SimpleCounterWork()

        if self.dict["w"].status.stage == WorkStageStatus.SUCCEEDED:
            self._exit()

        self.dict["w"].run()


def test_dict_with_queues():

    app = LightningApp(FlowDict())
    MultiProcessRuntime(app, start_server=False).dispatch()


class FlowList(LightningFlow):
    def __init__(self):
        super().__init__()
        self.list = List()

    def run(self):
        if not len(self.list):
            self.list.append(SimpleCounterWork())

        if self.list[-1].status.stage == WorkStageStatus.SUCCEEDED:
            self._exit()

        self.list[-1].run()


def test_list_with_queues():

    app = LightningApp(FlowList())
    MultiProcessRuntime(app, start_server=False).dispatch()


class WorkS(LightningWork):
    def __init__(self):
        super().__init__()
        self.payload = None

    def run(self):
        self.payload = Payload(2)


class WorkD(LightningWork):
    def run(self, payload):
        assert payload.value == 2


class FlowPayload(LightningFlow):
    def __init__(self):
        super().__init__()
        self.src = WorkS()
        self.dst = Dict(**{"0": WorkD(parallel=True), "1": WorkD(parallel=True)})

    def run(self):
        self.src.run()
        if self.src.payload:
            for work in self.dst.values():
                work.run(self.src.payload)
        if all(w.has_succeeded for w in self.dst.values()):
            self._exit()


def test_structures_with_payload():
    app = LightningApp(FlowPayload(), debug=True)
    MultiProcessRuntime(app, start_server=False).dispatch()
    os.remove("payload")