"""Configuration layering: CLI flag > frontmatter > default."""
from __future__ import annotations

import pytest

from wapdown.config import DEFAULT_MAX_CARD_BYTES, ConfigError, DeckConfig


class TestPrecedence:
    def test_defaults_when_nothing_is_given(self):
        config = DeckConfig.resolve()
        assert config.split_level == 0
        assert config.max_card_bytes == DEFAULT_MAX_CARD_BYTES
        assert config.menu is True
        assert config.menu_style == "links"
        assert config.title is None

    def test_frontmatter_beats_default(self):
        config = DeckConfig.resolve({"split_level": "2", "title": "Trail"})
        assert config.split_level == 2
        assert config.title == "Trail"

    def test_cli_beats_frontmatter(self):
        config = DeckConfig.resolve({"split_level": "2"}, {"split_level": 3})
        assert config.split_level == 3

    def test_absent_cli_option_does_not_clobber_frontmatter(self):
        # argparse hands every unset option through as None; that must mean
        # "not given" rather than "set to nothing".
        config = DeckConfig.resolve({"title": "Trail"}, {"title": None, "menu": None})
        assert config.title == "Trail"
        assert config.menu is True

    def test_unknown_frontmatter_key_warns_but_does_not_fail(self, capsys):
        config = DeckConfig.resolve({"hyphenate": "true", "title": "T"})
        assert config.title == "T"
        assert "unknown frontmatter key 'hyphenate'" in capsys.readouterr().err


class TestCoercion:
    @pytest.mark.parametrize("raw", ["true", "yes", "1", "on", "TRUE"])
    def test_truthy_strings(self, raw):
        assert DeckConfig.resolve({"menu": raw}).menu is True

    @pytest.mark.parametrize("raw", ["false", "no", "0", "off", "FALSE"])
    def test_falsy_strings(self, raw):
        assert DeckConfig.resolve({"menu": raw}).menu is False

    def test_menu_style_is_case_insensitive(self):
        assert DeckConfig.resolve({"menu_style": "SELECT"}).menu_style == "select"

    def test_hyphenated_frontmatter_key_is_accepted(self):
        assert DeckConfig.resolve({"split-level": "2"}).split_level == 2

    def test_empty_title_becomes_none(self):
        assert DeckConfig.resolve({"title": ""}).title is None


class TestValidation:
    @pytest.mark.parametrize("value", [-1, 7])
    def test_split_level_out_of_range(self, value):
        with pytest.raises(ConfigError, match="split_level"):
            DeckConfig.resolve(overrides={"split_level": value})

    def test_negative_byte_budget(self):
        with pytest.raises(ConfigError, match="max_card_bytes"):
            DeckConfig.resolve(overrides={"max_card_bytes": -1})

    def test_unknown_menu_style(self):
        with pytest.raises(ConfigError, match="menu_style"):
            DeckConfig.resolve(overrides={"menu_style": "carousel"})

    def test_unknown_image_policy(self):
        with pytest.raises(ConfigError, match="images"):
            DeckConfig.resolve(overrides={"images": "wbmp"})

    def test_non_numeric_split_level_in_frontmatter(self):
        # Previously an uncaught ValueError escaping as a traceback.
        with pytest.raises(ConfigError, match="split_level must be a number"):
            DeckConfig.resolve({"split_level": "deep"})

    def test_non_boolean_menu_in_frontmatter(self):
        with pytest.raises(ConfigError, match="menu must be a boolean"):
            DeckConfig.resolve({"menu": "sometimes"})