from __future__ import annotations

import pytest

from govoplan_core.core.appearance import (
    normalize_appearance_overrides,
    resolve_effective_appearance,
    update_appearance_custom_overrides_policy,
    update_appearance_settings,
)


def _overrides() -> dict[str, object]:
    return {
        "schema_version": "1",
        "light": {
            "accent": "#245f91", "accent_foreground": "#ffffff",
            "surface": "#ffffff", "surface_foreground": "#303135",
            "success": "#d8eee8", "success_foreground": "#315f55",
            "info": "#dce9f3", "info_foreground": "#294a61",
            "warning": "#ffe1a3", "warning_foreground": "#593700",
            "danger": "#f8d1cc", "danger_foreground": "#873c35",
        },
        "dark": {
            "accent": "#7ea6c5", "accent_foreground": "#242424",
            "surface": "#262724", "surface_foreground": "#f1f1f1",
            "success": "#24473f", "success_foreground": "#d8eee8",
            "info": "#243d4e", "info_foreground": "#dce9f3",
            "warning": "#5a431f", "warning_foreground": "#ffe1a3",
            "danger": "#4f2d2a", "danger_foreground": "#f8d1cc",
        },
    }


def test_appearance_precedence_and_inheritance() -> None:
    decision = resolve_effective_appearance(
        system_settings={"appearance": {"default_palette": "civic_blue"}},
        tenant_settings={"appearance": {"default_palette": "forest"}},
        user_settings={"ui": {"palette": "plum"}},
    )
    assert (decision.palette, decision.source, decision.locked) == ("plum", "user", False)

    inherited = resolve_effective_appearance(
        system_settings={"appearance": {"default_palette": "civic_blue"}},
        tenant_settings={"appearance": {"default_palette": "forest"}},
        user_settings={"ui": {"palette": None}},
    )
    assert (inherited.palette, inherited.source) == ("forest", "tenant")


def test_system_lock_wins_and_invalid_values_fail_safe() -> None:
    decision = resolve_effective_appearance(
        system_settings={"appearance": {"default_palette": "civic_blue", "palette_locked": True}},
        tenant_settings={"appearance": {"default_palette": "forest", "palette_locked": True}},
        user_settings={"ui": {"palette": "plum"}},
    )
    assert decision.as_dict() == {
        "palette": "civic_blue",
        "source": "system_lock",
        "locked": True,
        "system_default_palette": "civic_blue",
        "tenant_default_palette": "forest",
        "inherited_palette": "civic_blue",
        "custom_overrides": None,
        "custom_overrides_allowed": False,
    }
    fallback = resolve_effective_appearance(
        system_settings={"appearance": {"default_palette": "unsafe"}},
        tenant_settings={},
        user_settings={"ui": {"palette": "unknown"}},
    )
    assert (fallback.palette, fallback.source) == ("default", "system")


def test_appearance_settings_reset_without_touching_neighbors() -> None:
    configured = update_appearance_settings(
        {"neighbor": {"kept": True}},
        default_palette="forest",
        palette_locked=True,
    )
    assert configured["neighbor"] == {"kept": True}
    assert configured["appearance"] == {"default_palette": "forest", "palette_locked": True}
    assert update_appearance_settings(configured, default_palette=None, palette_locked=False) == {
        "neighbor": {"kept": True}
    }


def test_custom_overrides_require_system_and_tenant_policy_and_validate_both_modes() -> None:
    document = _overrides()
    normalized = normalize_appearance_overrides(document)
    assert normalized == document
    decision = resolve_effective_appearance(
        system_settings={"appearance": {"allow_custom_overrides": True}},
        tenant_settings={"appearance": {"allow_custom_overrides": True}},
        user_settings={"ui": {"appearance_overrides": document}},
    )
    assert decision.custom_overrides_allowed is True
    assert decision.custom_overrides == document

    blocked = resolve_effective_appearance(
        system_settings={"appearance": {"allow_custom_overrides": True}},
        tenant_settings={"appearance": {"allow_custom_overrides": False}},
        user_settings={"ui": {"appearance_overrides": document}},
    )
    assert blocked.custom_overrides_allowed is False
    assert blocked.custom_overrides is None

    invalid = _overrides()
    invalid["dark"]["danger"] = invalid["dark"]["warning"]  # type: ignore[index]
    with pytest.raises(ValueError, match="visibly distinct"):
        normalize_appearance_overrides(invalid)

    low_contrast = _overrides()
    low_contrast["light"]["accent_foreground"] = "#245f91"  # type: ignore[index]
    with pytest.raises(ValueError, match="WCAG AA"):
        normalize_appearance_overrides(low_contrast)


def test_custom_override_policy_update_preserves_neighboring_appearance_settings() -> None:
    configured = update_appearance_custom_overrides_policy(
        {"appearance": {"default_palette": "forest"}},
        allowed=True,
    )
    assert configured == {"appearance": {"default_palette": "forest", "allow_custom_overrides": True}}
    assert update_appearance_custom_overrides_policy(configured, allowed=None) == {
        "appearance": {"default_palette": "forest"}
    }