"""Config flow tests for the CDiT Adaptive Lighting fork.

Covers spec/options-flow/spec.md requirements R1, R2, R3, R5, R6, R7.
"""

from __future__ import annotations

from homeassistant.config_entries import SOURCE_IMPORT
from homeassistant.const import CONF_NAME
from homeassistant.data_entry_flow import FlowResultType
from homeassistant.helpers.selector import (
    BooleanSelector,
    EntitySelector,
    NumberSelector,
    NumberSelectorMode,
)
from pytest_homeassistant_custom_component.common import MockConfigEntry

from custom_components.adaptive_lighting.config_flow import (
    SECTION_ADVANCED,
    SECTION_DAYTIME,
    SECTION_DIAGNOSTICS,
    SECTION_LIGHT_CONTROL,
    SECTION_SUN,
    SECTION_TARGETS,
    _build_options_schema,
)
from custom_components.adaptive_lighting.const import (
    CONF_INCLUDE_CONFIG_IN_ATTRIBUTES,
    CONF_INTERCEPT,
    CONF_INTERVAL,
    CONF_LIGHTS,
    CONF_MAX_BRIGHTNESS,
    CONF_MAX_COLOR_TEMP,
    CONF_MIN_BRIGHTNESS,
    CONF_MIN_COLOR_TEMP,
    CONF_MULTI_LIGHT_INTERCEPT,
    CONF_PREFER_RGB_COLOR,
    CONF_SEND_SPLIT_DELAY,
    CONF_SEPARATE_TURN_ON_COMMANDS,
    CONF_SKIP_REDUNDANT_COMMANDS,
    CONF_SUNRISE_ENTITY,
    CONF_SUNSET_ENTITY,
    DEFAULT_NAME,
    DEFAULT_SUNRISE_ENTITY,
    DEFAULT_SUNSET_ENTITY,
    DOMAIN,
)

EXPECTED_SECTIONS = (
    SECTION_TARGETS,
    SECTION_DAYTIME,
    SECTION_SUN,
    SECTION_LIGHT_CONTROL,
    SECTION_ADVANCED,
    SECTION_DIAGNOSTICS,
)

EXPECTED_SECTION_FIELDS: dict[str, set[str]] = {
    SECTION_TARGETS: {CONF_LIGHTS},
    SECTION_DAYTIME: {
        CONF_MIN_BRIGHTNESS,
        CONF_MAX_BRIGHTNESS,
        CONF_MIN_COLOR_TEMP,
        CONF_MAX_COLOR_TEMP,
        CONF_PREFER_RGB_COLOR,
    },
    SECTION_SUN: {CONF_SUNRISE_ENTITY, CONF_SUNSET_ENTITY},
    SECTION_LIGHT_CONTROL: {CONF_INTERCEPT, CONF_MULTI_LIGHT_INTERCEPT},
    SECTION_ADVANCED: {
        CONF_INTERVAL,
        "transition",
        "initial_transition",
        "adapt_delay",
        CONF_SEPARATE_TURN_ON_COMMANDS,
        CONF_SKIP_REDUNDANT_COMMANDS,
    },
    SECTION_DIAGNOSTICS: {CONF_INCLUDE_CONFIG_IN_ATTRIBUTES},
}


def _section_inner_keys(schema_section) -> set[str]:
    """Return the field names inside a sectioned schema entry."""
    # `section()` returns a special wrapper object whose `schema` attribute
    # holds the inner vol.Schema. Each key is a vol.Marker (Required/Optional)
    # whose `schema` is the field name string.
    inner = schema_section.schema.schema  # vol.Schema → underlying dict
    return {str(k.schema) if hasattr(k, "schema") else str(k) for k in inner}


# ---------------------------------------------------------------------------
# R1: section layout
# ---------------------------------------------------------------------------


def test_options_schema_has_all_six_sections_in_order() -> None:
    """R1: the options form returns the six named sections in order."""
    schema = _build_options_schema({}, show_send_split_delay=False)
    keys = [
        k.schema if hasattr(k, "schema") else k
        for k in schema.schema  # type: ignore[attr-defined]
    ]
    assert tuple(keys) == EXPECTED_SECTIONS


def test_each_section_contains_only_its_specified_fields() -> None:
    """R1 scenario 2: every field appears in exactly one section, matching
    the layout table."""
    schema = _build_options_schema({}, show_send_split_delay=True)
    for marker in schema.schema:  # type: ignore[attr-defined]
        section_id = marker.schema if hasattr(marker, "schema") else marker
        inner_fields = _section_inner_keys(schema.schema[marker])  # type: ignore[index]
        expected = EXPECTED_SECTION_FIELDS[section_id].copy()
        # Advanced gains send_split_delay when its driver is true.
        if section_id == SECTION_ADVANCED:
            expected.add(CONF_SEND_SPLIT_DELAY)
        assert inner_fields == expected, (
            f"section {section_id}: expected {expected}, got {inner_fields}"
        )


# ---------------------------------------------------------------------------
# R2: conditional visibility of send_split_delay
# ---------------------------------------------------------------------------


def test_send_split_delay_hidden_when_driver_false() -> None:
    """R2: send_split_delay is absent when separate_turn_on_commands=False."""
    schema = _build_options_schema({}, show_send_split_delay=False)
    advanced_marker = next(
        m
        for m in schema.schema  # type: ignore[attr-defined]
        if (m.schema if hasattr(m, "schema") else m) == SECTION_ADVANCED
    )
    advanced = schema.schema[advanced_marker]  # type: ignore[index]
    assert CONF_SEND_SPLIT_DELAY not in _section_inner_keys(advanced)


def test_send_split_delay_visible_when_driver_true() -> None:
    """R2: send_split_delay appears when separate_turn_on_commands=True."""
    schema = _build_options_schema({}, show_send_split_delay=True)
    advanced_marker = next(
        m
        for m in schema.schema  # type: ignore[attr-defined]
        if (m.schema if hasattr(m, "schema") else m) == SECTION_ADVANCED
    )
    advanced = schema.schema[advanced_marker]  # type: ignore[index]
    assert CONF_SEND_SPLIT_DELAY in _section_inner_keys(advanced)


# ---------------------------------------------------------------------------
# R3: entity-driven sun timing
# ---------------------------------------------------------------------------


def test_default_sunrise_and_sunset_entities() -> None:
    """R3: default entities point at the built-in sun.sun sensors."""
    schema = _build_options_schema({}, show_send_split_delay=False)
    sun_marker = next(
        m
        for m in schema.schema  # type: ignore[attr-defined]
        if (m.schema if hasattr(m, "schema") else m) == SECTION_SUN
    )
    sun_inner = schema.schema[sun_marker].schema.schema  # type: ignore[index]
    defaults = {
        (k.schema if hasattr(k, "schema") else k): k.default()
        for k in sun_inner
        if hasattr(k, "default")
    }
    assert defaults[CONF_SUNRISE_ENTITY] == DEFAULT_SUNRISE_ENTITY == "sensor.sun_next_rising"
    assert defaults[CONF_SUNSET_ENTITY] == DEFAULT_SUNSET_ENTITY == "sensor.sun_next_setting"


def test_sun_entity_selectors_are_strict_timestamp_sensors() -> None:
    """R3 + D14: both sun-event entity selectors filter by domain=sensor and
    device_class=timestamp."""
    schema = _build_options_schema({}, show_send_split_delay=False)
    sun_marker = next(
        m
        for m in schema.schema  # type: ignore[attr-defined]
        if (m.schema if hasattr(m, "schema") else m) == SECTION_SUN
    )
    sun_inner = schema.schema[sun_marker].schema.schema  # type: ignore[index]
    for k, v in sun_inner.items():
        field_name = k.schema if hasattr(k, "schema") else k
        if field_name in (CONF_SUNRISE_ENTITY, CONF_SUNSET_ENTITY):
            assert isinstance(v, EntitySelector)
            cfg = v.config
            # HA normalizes `domain="sensor"` to `domain=["sensor"]` and
            # `device_class="timestamp"` to `device_class=["timestamp"]`.
            domain = cfg.get("domain")
            device_class = cfg.get("device_class")
            assert "sensor" in (domain if isinstance(domain, list) else [domain])
            assert "timestamp" in (
                device_class if isinstance(device_class, list) else [device_class]
            )


# ---------------------------------------------------------------------------
# R5: native HA selectors
# ---------------------------------------------------------------------------


def test_brightness_uses_slider_number_selector() -> None:
    """R5: brightness fields are NumberSelectors with slider mode, 1–100 %, step 1."""
    schema = _build_options_schema({}, show_send_split_delay=False)
    daytime_marker = next(
        m
        for m in schema.schema  # type: ignore[attr-defined]
        if (m.schema if hasattr(m, "schema") else m) == SECTION_DAYTIME
    )
    inner = schema.schema[daytime_marker].schema.schema  # type: ignore[index]
    for k, v in inner.items():
        field_name = k.schema if hasattr(k, "schema") else k
        if field_name in (CONF_MIN_BRIGHTNESS, CONF_MAX_BRIGHTNESS):
            assert isinstance(v, NumberSelector)
            cfg = v.config
            assert cfg["min"] == 1
            assert cfg["max"] == 100
            assert cfg["step"] == 1
            assert cfg["unit_of_measurement"] == "%"
            assert cfg["mode"] == NumberSelectorMode.SLIDER


def test_color_temp_uses_box_number_selector() -> None:
    """R5: color-temp fields are NumberSelectors, 1000–10000 K, step 100."""
    schema = _build_options_schema({}, show_send_split_delay=False)
    daytime_marker = next(
        m
        for m in schema.schema  # type: ignore[attr-defined]
        if (m.schema if hasattr(m, "schema") else m) == SECTION_DAYTIME
    )
    inner = schema.schema[daytime_marker].schema.schema  # type: ignore[index]
    for k, v in inner.items():
        field_name = k.schema if hasattr(k, "schema") else k
        if field_name in (CONF_MIN_COLOR_TEMP, CONF_MAX_COLOR_TEMP):
            assert isinstance(v, NumberSelector)
            cfg = v.config
            assert cfg["min"] == 1000
            assert cfg["max"] == 10000
            assert cfg["step"] == 100
            assert cfg["unit_of_measurement"] == "K"


def test_booleans_use_boolean_selector() -> None:
    """R5: every boolean field renders as a BooleanSelector."""
    schema = _build_options_schema({}, show_send_split_delay=True)
    boolean_fields = {
        CONF_PREFER_RGB_COLOR,
        CONF_INTERCEPT,
        CONF_MULTI_LIGHT_INTERCEPT,
        CONF_SEPARATE_TURN_ON_COMMANDS,
        CONF_SKIP_REDUNDANT_COMMANDS,
        CONF_INCLUDE_CONFIG_IN_ATTRIBUTES,
    }
    for marker in schema.schema:  # type: ignore[attr-defined]
        section = schema.schema[marker]  # type: ignore[index]
        for k, v in section.schema.schema.items():
            field_name = k.schema if hasattr(k, "schema") else k
            if field_name in boolean_fields:
                assert isinstance(v, BooleanSelector), (
                    f"{field_name} is {type(v).__name__}, expected BooleanSelector"
                )


# ---------------------------------------------------------------------------
# Full flow integration tests (R6, R7)
# ---------------------------------------------------------------------------


async def test_user_flow_creates_entry(hass) -> None:
    """The user step creates an entry with the given name."""
    result = await hass.config_entries.flow.async_init(
        DOMAIN,
        context={"source": "user"},
    )
    assert result["type"] is FlowResultType.FORM
    assert result["step_id"] == "user"

    result = await hass.config_entries.flow.async_configure(
        result["flow_id"],
        user_input={CONF_NAME: "living room"},
    )
    assert result["type"] is FlowResultType.CREATE_ENTRY
    assert result["title"] == "living room"


async def test_yaml_managed_entry_aborts_options_flow(hass) -> None:
    """R7: options flow on a SOURCE_IMPORT entry aborts with yaml_managed."""
    entry = MockConfigEntry(
        domain=DOMAIN,
        title=DEFAULT_NAME,
        data={CONF_NAME: DEFAULT_NAME},
        options={},
        source=SOURCE_IMPORT,
        version=2,
    )
    entry.add_to_hass(hass)
    await hass.config_entries.async_setup(entry.entry_id)

    result = await hass.config_entries.options.async_init(entry.entry_id)
    assert result["type"] is FlowResultType.ABORT
    assert result["reason"] == "yaml_managed"


async def test_options_flow_renders_sectioned_schema(hass) -> None:
    """R1 + R6: opening options on a UI-managed entry shows the sectioned form."""
    entry = MockConfigEntry(
        domain=DOMAIN,
        title=DEFAULT_NAME,
        data={CONF_NAME: DEFAULT_NAME},
        options={},
        version=2,
    )
    entry.add_to_hass(hass)
    await hass.config_entries.async_setup(entry.entry_id)

    result = await hass.config_entries.options.async_init(entry.entry_id)
    assert result["type"] is FlowResultType.FORM
    assert result["step_id"] == "init"
    # The form's data_schema contains the six section keys.
    schema_keys = [
        (k.schema if hasattr(k, "schema") else k)
        for k in result["data_schema"].schema  # type: ignore[union-attr,attr-defined]
    ]
    assert tuple(schema_keys) == EXPECTED_SECTIONS