"""Test the flow classes."""
import pytest
import voluptuous as vol

from homeassistant import data_entry_flow
from homeassistant.util.decorator import Registry

from tests.common import async_capture_events


@pytest.fixture
def manager():
    """Return a flow manager."""
    handlers = Registry()
    entries = []

    class FlowManager(data_entry_flow.FlowManager):
        """Test flow manager."""

        async def async_create_flow(self, handler_key, *, context, data):
            """Test create flow."""
            handler = handlers.get(handler_key)

            if handler is None:
                raise data_entry_flow.UnknownHandler

            flow = handler()
            flow.init_step = context.get("init_step", "init")
            return flow

        async def async_finish_flow(self, flow, result):
            """Test finish flow."""
            if result["type"] == data_entry_flow.RESULT_TYPE_CREATE_ENTRY:
                result["source"] = flow.context.get("source")
                entries.append(result)
            return result

    mgr = FlowManager(None)
    mgr.mock_created_entries = entries
    mgr.mock_reg_handler = handlers.register
    return mgr


async def test_configure_reuses_handler_instance(manager):
    """Test that we reuse instances."""

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        handle_count = 0

        async def async_step_init(self, user_input=None):
            self.handle_count += 1
            return self.async_show_form(
                errors={"base": str(self.handle_count)}, step_id="init"
            )

    form = await manager.async_init("test")
    assert form["errors"]["base"] == "1"
    form = await manager.async_configure(form["flow_id"])
    assert form["errors"]["base"] == "2"
    assert len(manager.async_progress()) == 1
    assert len(manager.mock_created_entries) == 0


async def test_configure_two_steps(manager):
    """Test that we reuse instances."""

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        VERSION = 1

        async def async_step_first(self, user_input=None):
            if user_input is not None:
                self.init_data = user_input
                return await self.async_step_second()
            return self.async_show_form(step_id="first", data_schema=vol.Schema([str]))

        async def async_step_second(self, user_input=None):
            if user_input is not None:
                return self.async_create_entry(
                    title="Test Entry", data=self.init_data + user_input
                )
            return self.async_show_form(step_id="second", data_schema=vol.Schema([str]))

    form = await manager.async_init("test", context={"init_step": "first"})

    with pytest.raises(vol.Invalid):
        form = await manager.async_configure(form["flow_id"], "INCORRECT-DATA")

    form = await manager.async_configure(form["flow_id"], ["INIT-DATA"])
    form = await manager.async_configure(form["flow_id"], ["SECOND-DATA"])
    assert form["type"] == data_entry_flow.RESULT_TYPE_CREATE_ENTRY
    assert len(manager.async_progress()) == 0
    assert len(manager.mock_created_entries) == 1
    result = manager.mock_created_entries[0]
    assert result["handler"] == "test"
    assert result["data"] == ["INIT-DATA", "SECOND-DATA"]


async def test_show_form(manager):
    """Test that we can show a form."""
    schema = vol.Schema({vol.Required("username"): str, vol.Required("password"): str})

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        async def async_step_init(self, user_input=None):
            return self.async_show_form(
                step_id="init",
                data_schema=schema,
                errors={"username": "Should be unique."},
            )

    form = await manager.async_init("test")
    assert form["type"] == "form"
    assert form["data_schema"] is schema
    assert form["errors"] == {"username": "Should be unique."}


async def test_abort_removes_instance(manager):
    """Test that abort removes the flow from progress."""

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        is_new = True

        async def async_step_init(self, user_input=None):
            old = self.is_new
            self.is_new = False
            return self.async_abort(reason=str(old))

    form = await manager.async_init("test")
    assert form["reason"] == "True"
    assert len(manager.async_progress()) == 0
    assert len(manager.mock_created_entries) == 0
    form = await manager.async_init("test")
    assert form["reason"] == "True"
    assert len(manager.async_progress()) == 0
    assert len(manager.mock_created_entries) == 0


async def test_create_saves_data(manager):
    """Test creating a config entry."""

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        VERSION = 5

        async def async_step_init(self, user_input=None):
            return self.async_create_entry(title="Test Title", data="Test Data")

    await manager.async_init("test")
    assert len(manager.async_progress()) == 0
    assert len(manager.mock_created_entries) == 1

    entry = manager.mock_created_entries[0]
    assert entry["version"] == 5
    assert entry["handler"] == "test"
    assert entry["title"] == "Test Title"
    assert entry["data"] == "Test Data"
    assert entry["source"] is None


async def test_discovery_init_flow(manager):
    """Test a flow initialized by discovery."""

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        VERSION = 5

        async def async_step_init(self, info):
            return self.async_create_entry(title=info["id"], data=info)

    data = {"id": "hello", "token": "secret"}

    await manager.async_init("test", context={"source": "discovery"}, data=data)
    assert len(manager.async_progress()) == 0
    assert len(manager.mock_created_entries) == 1

    entry = manager.mock_created_entries[0]
    assert entry["version"] == 5
    assert entry["handler"] == "test"
    assert entry["title"] == "hello"
    assert entry["data"] == data
    assert entry["source"] == "discovery"


async def test_finish_callback_change_result_type(hass):
    """Test finish callback can change result type."""

    class TestFlow(data_entry_flow.FlowHandler):
        VERSION = 1

        async def async_step_init(self, input):
            """Return init form with one input field 'count'."""
            if input is not None:
                return self.async_create_entry(title="init", data=input)
            return self.async_show_form(
                step_id="init", data_schema=vol.Schema({"count": int})
            )

    class FlowManager(data_entry_flow.FlowManager):
        async def async_create_flow(self, handler_name, *, context, data):
            """Create a test flow."""
            return TestFlow()

        async def async_finish_flow(self, flow, result):
            """Redirect to init form if count <= 1."""
            if result["type"] == data_entry_flow.RESULT_TYPE_CREATE_ENTRY:
                if result["data"] is None or result["data"].get("count", 0) <= 1:
                    return flow.async_show_form(
                        step_id="init", data_schema=vol.Schema({"count": int})
                    )
                else:
                    result["result"] = result["data"]["count"]
            return result

    manager = FlowManager(hass)

    result = await manager.async_init("test")
    assert result["type"] == data_entry_flow.RESULT_TYPE_FORM
    assert result["step_id"] == "init"

    result = await manager.async_configure(result["flow_id"], {"count": 0})
    assert result["type"] == data_entry_flow.RESULT_TYPE_FORM
    assert result["step_id"] == "init"
    assert "result" not in result

    result = await manager.async_configure(result["flow_id"], {"count": 2})
    assert result["type"] == data_entry_flow.RESULT_TYPE_CREATE_ENTRY
    assert result["result"] == 2


async def test_external_step(hass, manager):
    """Test external step logic."""
    manager.hass = hass

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        VERSION = 5
        data = None

        async def async_step_init(self, user_input=None):
            if not user_input:
                return self.async_external_step(
                    step_id="init", url="https://example.com"
                )

            self.data = user_input
            return self.async_external_step_done(next_step_id="finish")

        async def async_step_finish(self, user_input=None):
            return self.async_create_entry(title=self.data["title"], data=self.data)

    events = async_capture_events(
        hass, data_entry_flow.EVENT_DATA_ENTRY_FLOW_PROGRESSED
    )

    result = await manager.async_init("test")
    assert result["type"] == data_entry_flow.RESULT_TYPE_EXTERNAL_STEP
    assert len(manager.async_progress()) == 1

    # Mimic external step
    # Called by integrations: `hass.config_entries.flow.async_configure(…)`
    result = await manager.async_configure(result["flow_id"], {"title": "Hello"})
    assert result["type"] == data_entry_flow.RESULT_TYPE_EXTERNAL_STEP_DONE

    await hass.async_block_till_done()
    assert len(events) == 1
    assert events[0].data == {
        "handler": "test",
        "flow_id": result["flow_id"],
        "refresh": True,
    }

    # Frontend refreshses the flow
    result = await manager.async_configure(result["flow_id"])
    assert result["type"] == data_entry_flow.RESULT_TYPE_CREATE_ENTRY
    assert result["title"] == "Hello"


async def test_abort_flow_exception(manager):
    """Test that the AbortFlow exception works."""

    @manager.mock_reg_handler("test")
    class TestFlow(data_entry_flow.FlowHandler):
        async def async_step_init(self, user_input=None):
            raise data_entry_flow.AbortFlow("mock-reason", {"placeholder": "yo"})

    form = await manager.async_init("test")
    assert form["type"] == "abort"
    assert form["reason"] == "mock-reason"
    assert form["description_placeholders"] == {"placeholder": "yo"}