"""End-to-end behaviour of the `wapdown` command."""
from __future__ import annotations

import pytest

from conftest import EXAMPLES
from wapdown.cli import main


TWO_SECTIONS = "Intro.\n\n{.card One}\nFirst.\n\n{.card Two}\nSecond.\n"


@pytest.fixture
def source(tmp_path):
    def _write(text: str = TWO_SECTIONS, name: str = "doc.md"):
        path = tmp_path / name
        path.write_text(text, encoding="utf-8")
        return path

    return _write


class TestOutput:
    def test_writes_to_stdout_by_default(self, source, capsys):
        assert main([str(source())]) == 0
        assert capsys.readouterr().out.startswith('<?xml version="1.0"?>')

    def test_writes_to_a_file(self, source, tmp_path):
        out = tmp_path / "deck.wml"
        assert main([str(source()), "-o", str(out)]) == 0
        assert out.read_text(encoding="utf-8").endswith("</wml>\n")

    def test_creates_missing_parent_directories(self, source, tmp_path):
        out = tmp_path / "nested" / "deep" / "deck.wml"
        assert main([str(source()), "-o", str(out)]) == 0
        assert out.exists()

    def test_uses_lf_line_endings(self, source, tmp_path):
        out = tmp_path / "deck.wml"
        main([str(source()), "-o", str(out)])
        assert b"\r" not in out.read_bytes()

    def test_deck_per_card_writes_a_directory(self, source, tmp_path):
        out = tmp_path / "decks"
        assert main([str(source()), "--deck-per-card", "-o", str(out)]) == 0
        assert sorted(p.name for p in out.iterdir()) == [
            "index.wml",
            "one.wml",
            "two.wml",
        ]

    def test_deck_per_card_without_output_is_refused(self, source):
        # Several files cannot be written to stdout, so say so rather than
        # silently emitting only one of them.
        with pytest.raises(SystemExit, match="pass -o DIRECTORY"):
            main([str(source()), "--deck-per-card"])


class TestOptions:
    def test_flags_reach_the_renderer(self, source, capsys):
        main([str(source()), "--menu-style", "select", "--title", "Deck"])
        out = capsys.readouterr().out
        assert "<select" in out
        assert 'title="Deck"' in out

    def test_flag_overrides_frontmatter(self, source, capsys):
        path = source("---\ntitle: FromFile\n---\n" + TWO_SECTIONS)
        main([str(path), "--title", "FromFlag"])
        assert 'title="FromFlag"' in capsys.readouterr().out

    def test_frontmatter_applies_without_a_flag(self, source, capsys):
        path = source("---\nmenu_style: select\n---\n" + TWO_SECTIONS)
        main([str(path)])
        assert "<select" in capsys.readouterr().out

    def test_no_menu_switches_to_linear(self, source, capsys):
        main([str(source()), "--no-menu"])
        assert '<card id="menu"' not in capsys.readouterr().out

    def test_frontmatter_is_not_rendered_as_content(self, source, capsys):
        path = source("---\ntitle: Deck\n---\n" + TWO_SECTIONS)
        main([str(path)])
        assert "title: Deck" not in capsys.readouterr().out


class TestErrors:
    def test_missing_input_file(self, tmp_path, capsys):
        assert main([str(tmp_path / "nope.md")]) == 2
        assert "wapdown:" in capsys.readouterr().err

    def test_invalid_option_value(self, source, capsys):
        assert main([str(source()), "--split-level", "9"]) == 2
        assert "split_level" in capsys.readouterr().err

    def test_invalid_frontmatter_value(self, source, capsys):
        path = source("---\nsplit_level: deep\n---\n" + TWO_SECTIONS)
        assert main([str(path)]) == 2
        assert "must be a number" in capsys.readouterr().err

    def test_unknown_menu_style_is_rejected_by_argparse(self, source):
        with pytest.raises(SystemExit) as exc:
            main([str(source()), "--menu-style", "carousel"])
        assert exc.value.code == 2

    def test_missing_include_is_reported(self, source, capsys):
        path = source("Intro.\n\n{.include nowhere.md}\n")
        assert main([str(path)]) == 2
        assert "was not found" in capsys.readouterr().err


class TestIncludes:
    def test_included_file_contributes_content(self, tmp_path, capsys):
        (tmp_path / "part.md").write_text("Included body.\n", encoding="utf-8")
        main([str(_write(tmp_path, "Intro.\n\n{.include part.md}\n"))])
        assert "Included body." in capsys.readouterr().out

    def test_included_frontmatter_is_discarded(self, tmp_path, capsys):
        (tmp_path / "part.md").write_text(
            "---\ntitle: Ignored\n---\nIncluded body.\n", encoding="utf-8"
        )
        main([str(_write(tmp_path, "Intro.\n\n{.include part.md}\n"))])
        out = capsys.readouterr().out
        assert "Included body." in out
        assert "Ignored" not in out

    def test_circular_include_is_reported(self, tmp_path, capsys):
        (tmp_path / "a.md").write_text("{.include doc.md}\n", encoding="utf-8")
        assert main([str(_write(tmp_path, "{.include a.md}\n"))]) == 2
        assert "Circular include" in capsys.readouterr().err


def _write(directory, text: str, name: str = "doc.md"):
    path = directory / name
    path.write_text(text, encoding="utf-8")
    return path


class TestExamples:
    @pytest.mark.parametrize(
        "name", sorted(p.name for p in EXAMPLES.glob("*.md"))
    )
    def test_every_example_converts(self, name, tmp_path, capsys):
        assert main([str(EXAMPLES / name), "-o", str(tmp_path / "out.wml")]) == 0


class TestRuleDividers:
    RULES = "Intro.\n\n---\n\n## Alpha\n\nBody.\n"

    def test_rules_divide_by_default(self, source, capsys):
        main([str(source(self.RULES))])
        assert '<card id="menu"' in capsys.readouterr().out

    def test_no_split_on_rule_flag(self, source, capsys):
        main([str(source(self.RULES)), "--no-split-on-rule"])
        out = capsys.readouterr().out
        assert '<card id="menu"' not in out
        assert "------" not in out

    def test_frontmatter_can_disable(self, source, capsys):
        path = source("---\nsplit_on_rule: false\n---\n" + self.RULES)
        main([str(path)])
        assert '<card id="menu"' not in capsys.readouterr().out

    def test_leading_rule_without_frontmatter_keeps_content(self, source, capsys):
        # Regression: a document opening with `---` and no key: value pairs
        # had its opening swallowed as if it were a frontmatter fence.
        main([str(source("---\n\nKept text.\n\n---\n\nAlso kept.\n"))])
        out = capsys.readouterr().out
        assert "Kept text." in out
        assert "Also kept." in out

    def test_real_frontmatter_is_still_consumed(self, source, capsys):
        main([str(source("---\ntitle: Deck\n---\n\nBody.\n"))])
        out = capsys.readouterr().out
        assert "title: Deck" not in out
        assert 'title="Deck"' not in out or "Body." in out