import datetime

import pytest
import typer

from chemenu import config
from chemenu.commands.touch import touch_command
from chemenu.frontmatter_io import read_page


@pytest.fixture
def touch_wiki(kb_dir, monkeypatch):
    monkeypatch.setattr(config, "KB_DIR", kb_dir)
    return kb_dir


def _touch(**overrides):
    """Call the Typer callback with every option supplied.

    A callback invoked directly from a test receives `OptionInfo` objects for
    whatever the caller leaves out, so the defaults live here instead of being
    repeated in each test - and a new option costs one line rather than one per
    call site. Same hazard `dist_cmd` avoids by keeping its logic beside the
    wrapper.
    """
    kwargs = dict(
        page_title=None,
        summary=None,
        provenance=None,
        confidence_base=None,
        date=None,
        set_fields=None,
        add_fields=None,
        remove_fields=None,
        no_date=False,
        dry_run=False,
    )
    kwargs.update(overrides)
    return touch_command(**kwargs)


def test_touch_bumps_modified(touch_wiki):
    _touch(page_title="aurora")
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    # Unquoted YAML dates round-trip as date objects, matching the rest of wiki/.
    assert str(frontmatter["modified"]) == datetime.date.today().isoformat()


def test_touch_updates_summary_and_provenance(touch_wiki):
    _touch(
        page_title="aurora", summary="Now with a better summary", provenance="mixed",
        date="2026-08-13",
    )
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["summary"] == "Now with a better summary"
    assert frontmatter["provenance"] == "mixed"
    assert str(frontmatter["modified"]) == "2026-08-13"


def test_touch_rejects_invalid_provenance(touch_wiki):
    """Schema validation runs before the write, so a bad value can never land
    on disk the way a hand-edit could."""
    with pytest.raises(typer.Exit):
        _touch(page_title="aurora", provenance="hearsay")
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert "provenance" not in frontmatter or frontmatter["provenance"] != "hearsay"


def test_touch_dry_run_writes_nothing(touch_wiki):
    path = touch_wiki / "entities/systems/aurora.md"
    before = path.read_text(encoding="utf-8")
    _touch(page_title="aurora", summary="ignored", dry_run=True)
    assert path.read_text(encoding="utf-8") == before


def test_touch_fails_on_unknown_page(touch_wiki):
    with pytest.raises(typer.Exit):
        _touch(page_title="Nope")


def test_touch_uses_date_field_for_source_pages(touch_wiki):
    """Source pages declare `date:`, not `modified:` - the field comes from
    the type's schema rather than a hardcoded name."""
    _touch(page_title="Source - Aurora", date="2026-08-13")
    frontmatter, _ = read_page(touch_wiki / "sources/Source - Aurora.md")
    assert str(frontmatter["date"]) == "2026-08-13"
    assert "modified" not in frontmatter


def test_touch_leaves_a_sources_publication_date_alone(touch_wiki):
    """A source's `date:` is the publication date of the raw material, not a
    record of when the page was last edited. Auto-bumping it to today replaced a
    fact about the world and left the page contradicting the date printed in its
    own body - so it moves only on an explicit --date."""
    before, _ = read_page(touch_wiki / "sources/Source - Aurora.md")
    _touch(page_title="Source - Aurora", summary="Neue Zusammenfassung")
    frontmatter, _ = read_page(touch_wiki / "sources/Source - Aurora.md")
    assert frontmatter["summary"] == "Neue Zusammenfassung"
    assert str(frontmatter["date"]) == str(before["date"])


# --- --set / --add / --remove -------------------------------------------------


def test_set_replaces_a_field_new_wrote_once(touch_wiki):
    """The defect this exists for: `tags:` was writable at `new` and never
    again, so a mistyped list was permanent."""
    _touch(page_title="aurora", set_fields=["tags=k8s,storage"])
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["k8s", "storage"]


def test_set_replaces_rather_than_merging(touch_wiki):
    before, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert before["tags"] == ["server"]
    _touch(page_title="aurora", set_fields=["tags=only-this"])
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["only-this"]


def test_repeated_set_appends_within_one_call(touch_wiki):
    """Same rule as `new --set`: the separator-free way to pass an element
    containing a comma."""
    _touch(page_title="aurora", set_fields=["tags=a", "tags=b"])
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["a", "b"]


def test_set_honours_the_comma_escape(touch_wiki):
    _touch(page_title="aurora", set_fields=[r"tags=one\, two,three"])
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["one, two", "three"]


def test_add_extends_without_naming_the_whole_list(touch_wiki):
    _touch(page_title="aurora", add_fields=["tags=monitoring"])
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["server", "monitoring"]


def test_add_is_idempotent(touch_wiki):
    _touch(page_title="aurora", add_fields=["tags=server"])
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["server"]


def test_remove_drops_an_element(touch_wiki):
    _touch(page_title="aurora", add_fields=["tags=temporary"])
    _touch(page_title="aurora", remove_fields=["tags=temporary"])
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["server"]


def test_remove_of_an_absent_element_succeeds_and_says_so(touch_wiki, capsys):
    """Idempotent like `xref remove`, but never silent: a silent no-op looks
    exactly like a successful removal, which is how a typo hides."""
    _touch(page_title="aurora", remove_fields=["tags=never-there"])
    out = capsys.readouterr().out
    assert "not present, nothing removed" in out
    assert "never-there" in out
    frontmatter, _ = read_page(touch_wiki / "entities/systems/aurora.md")
    assert frontmatter["tags"] == ["server"]


def test_add_refuses_a_scalar_field(touch_wiki):
    with pytest.raises(typer.Exit):
        _touch(page_title="aurora", add_fields=["summary=more"])


def test_page_reference_fields_are_refused_and_name_xref(touch_wiki, capsys):
    """`xref` maintains the reverse direction and the body bullets; a bare
    frontmatter write would leave the other half stale."""
    for field in ("related", "sources", "entities", "concepts"):
        with pytest.raises(typer.Exit):
            _touch(page_title="aurora", set_fields=[f"{field}=Borealis"])
        assert "xref" in capsys.readouterr().out


def test_type_and_confidence_are_refused_with_their_owner(touch_wiki, capsys):
    with pytest.raises(typer.Exit):
        _touch(page_title="aurora", set_fields=["type=types/concept.md"])
    assert "page-lifecycle" in capsys.readouterr().out

    with pytest.raises(typer.Exit):
        _touch(page_title="aurora", set_fields=["confidence=0.99"])
    assert "confidence-base" in capsys.readouterr().out


def test_unknown_field_lists_what_the_page_actually_has(touch_wiki, capsys):
    """A typo, not a routing problem - so the message answers 'what did I mean'
    rather than naming another command."""
    with pytest.raises(typer.Exit):
        _touch(page_title="aurora", set_fields=["tag=k8s"])
    out = capsys.readouterr().out
    assert "declares no field 'tag'" in out
    assert "tags" in out


def test_set_validates_against_the_schema_before_writing(touch_wiki):
    path = touch_wiki / "entities/systems/aurora.md"
    before = path.read_text(encoding="utf-8")
    with pytest.raises(typer.Exit):
        _touch(page_title="aurora", set_fields=["entity_type=not-a-real-entity-type"])
    assert path.read_text(encoding="utf-8") == before


def test_set_raw_files_checks_the_path_exists(touch_wiki, raw_dir, monkeypatch):
    """`touch` writes this field now, so it owes the same filesystem check
    `new` does - the schema cannot express it."""
    monkeypatch.setattr(config, "ROOT", touch_wiki.parent)
    with pytest.raises(typer.Exit):
        _touch(page_title="Source - Aurora", set_fields=["raw_files=raw/notes/absent.md"])


def test_set_raw_files_accepts_an_existing_path_with_a_comma(touch_wiki, raw_dir, monkeypatch):
    """The repair the whole issue started from: a raw file moved, and the page
    pointing at it has to follow without anyone editing frontmatter."""
    monkeypatch.setattr(config, "ROOT", touch_wiki.parent)
    (raw_dir / "notes" / "Versioning, CI-CD.md").write_text("# notes\n", encoding="utf-8")
    _touch(
        page_title="Source - Aurora",
        set_fields=[r"raw_files=raw/notes/Versioning\, CI-CD.md"],
    )
    frontmatter, _ = read_page(touch_wiki / "sources/Source - Aurora.md")
    assert frontmatter["raw_files"] == ["raw/notes/Versioning, CI-CD.md"]


def test_dry_run_covers_set_too(touch_wiki):
    path = touch_wiki / "entities/systems/aurora.md"
    before = path.read_text(encoding="utf-8")
    _touch(page_title="aurora", set_fields=["tags=nope"], dry_run=True)
    assert path.read_text(encoding="utf-8") == before