"""Door B inbox provenance rendering + filename slugging (Phase 2 step 2).

Pure functions, zero runtime dependency, no guard call: the slug reduces a
dropped file's name to the Phase 1 id grammar, the `inbox-` namespace keeps
generated concepts disjoint from `index.md`/`ingest-*`/`promoted-verdict-*`,
and the provenance layer carries the §7-analogous honesty marker. The verdict
reservation applies here unchanged — the promotion gate stays the only path
into that layer.
"""

from __future__ import annotations

import hashlib
import re

import pytest

from llm_ingestion_okf import MaterializationError
from llm_ingestion_okf.inbox import inbox_filename, inbox_slug, render_inbox_concept

INGESTED_AT = "2026-07-25T12:00:00Z"

# Phase 1's id grammar (manifest.py `_ID_PATTERN`), restated independently so a
# change to that constant cannot silently widen what the inbox namespace admits.
ID_GRAMMAR = re.compile(r"[a-z0-9][a-z0-9-]*\Z")

# Names chosen to attack the grammar from every side: spaces, punctuation runs,
# case, unicode, path-ish characters, leading/trailing separators, digits first.
NASTY_NAMES = [
    "My Notes 2026.md",
    "  padded  .txt",
    "UPPER.CSV",
    "a__b  c.txt",
    "--weird--.md",
    "2026-report.md",
    "caf\u00e9.md",
    "re:port(final)[v2].md",
    "dots.in.name.md",
    "tab\tseparated.txt",
]


# --- slug: reduction to the Phase 1 id grammar ---


def test_slug_reduces_filename_to_the_phase_1_id_grammar() -> None:
    assert inbox_slug("My Notes 2026.md") == "my-notes-2026"


def test_slug_drops_the_extension() -> None:
    assert inbox_slug("report.csv") == "report"


def test_slug_keeps_inner_dots_as_separators() -> None:
    # A dot is not in the grammar; only the final extension is special.
    assert inbox_slug("dots.in.name.md") == "dots-in-name"


def test_slug_collapses_separator_runs_to_a_single_hyphen() -> None:
    assert inbox_slug("a__b  c.txt") == "a-b-c"


def test_slug_strips_leading_and_trailing_separators() -> None:
    assert inbox_slug("--weird--.md") == "weird"


def test_slug_lowercases() -> None:
    assert inbox_slug("UPPER.CSV") == "upper"


def test_slug_allows_a_leading_digit() -> None:
    # The Phase 1 grammar admits `[a-z0-9]` as the first character.
    assert inbox_slug("2026-report.md") == "2026-report"


def test_slug_replaces_non_ascii_rather_than_transliterating() -> None:
    # No guessing at a romanisation: every character outside the grammar is a
    # separator. Transliterating would be a semantic claim the slugger cannot
    # make - Norwegian "m\u00f8te" (meeting) would become "mote" (fashion).
    # The readable name survives verbatim in `title:`; the slug is an id.
    assert inbox_slug("caf\u00e9.md") == "caf"


def test_slug_is_stable_across_unicode_normalisation_forms() -> None:
    """macOS (APFS) hands filenames over DECOMPOSED. Without NFC normalisation
    the combining mark alone becomes a separator and the base letter survives,
    so one visual filename would slug two different ways depending on whether
    it arrived from a directory listing or from an operator-typed string.
    Escapes, not literals: the test must not depend on this file's own form.
    """
    composed = "caf\u00e9.md"  # NFC: e-acute as one code point
    decomposed = "cafe\u0301.md"  # NFD: plain e + combining acute
    assert composed != decomposed
    assert inbox_slug(composed) == inbox_slug(decomposed) == "caf"


def test_slug_does_not_transliterate_nordic_letters() -> None:
    assert inbox_slug("m\u00f8te-notat.md") == "m-te-notat"


@pytest.mark.parametrize("name", NASTY_NAMES)
def test_slug_output_always_matches_the_id_grammar(name: str) -> None:
    assert ID_GRAMMAR.match(inbox_slug(name))


def test_slug_is_deterministic() -> None:
    assert inbox_slug("My Notes 2026.md") == inbox_slug("My Notes 2026.md")


def test_slug_of_a_hidden_file_uses_its_leading_dot_name() -> None:
    # A dotfile has no extension to drop: `.hidden.md` stems to `.hidden`.
    assert inbox_slug(".hidden.md") == "hidden"


@pytest.mark.parametrize("name", ["---.md", "!!!.txt", "\u65e5\u672c.md", ""])
def test_slug_rejects_a_name_that_reduces_to_nothing(name: str) -> None:
    # Never invent a fallback name: an unusable filename is a typed per-file
    # failure the caller reports, not a silent `untitled`.
    with pytest.raises(MaterializationError) as excinfo:
        inbox_slug(name)
    assert excinfo.value.code == "inbox_slug_empty"


# --- filename: the `inbox-` namespace ---


def test_inbox_filename_namespaces_the_slug() -> None:
    assert inbox_filename("my-notes") == "inbox-my-notes.md"


@pytest.mark.parametrize("name", NASTY_NAMES)
def test_inbox_namespace_is_disjoint_from_the_reserved_names(name: str) -> None:
    """Namespace safety: no admissible slug can collide with `index.md`, a
    Door A concept (`ingest-*`), or a promoted verdict (`promoted-verdict-*`).
    """
    generated = inbox_filename(inbox_slug(name))
    assert generated != "index.md"
    assert not generated.startswith("ingest-")
    assert not generated.startswith("promoted-verdict-")
    assert generated.startswith("inbox-")


# --- provenance rendering ---


def test_frontmatter_keys_in_exact_order() -> None:
    out = render_inbox_concept(
        "Body text",
        okf_type="note",
        title="My Notes",
        source_file="My Notes 2026.md",
        source_bytes=b"original",
        ingested_at=INGESTED_AT,
    )
    digest = hashlib.sha256(b"original").hexdigest()
    assert out == (
        "---\n"
        "type: note\n"
        "title: My Notes\n"
        "source_file: My Notes 2026.md\n"
        f"source_sha256: {digest}\n"
        f"ingested_at: {INGESTED_AT}\n"
        "generated: true\n"
        "---\n"
        "\n"
        "Body text\n"
    )


def test_source_sha256_is_over_the_original_bytes_not_the_extracted_text() -> None:
    """The honesty marker must point at what was DROPPED, not at what the
    extractor produced — otherwise provenance cannot be re-verified against the
    operator's file.
    """
    raw = b"name\nAda\n"
    text = "| name |\n| --- |\n| Ada |\n"
    out = render_inbox_concept(
        text,
        okf_type="note",
        title="Data",
        source_file="data.csv",
        source_bytes=raw,
        ingested_at=INGESTED_AT,
    )
    assert f"source_sha256: {hashlib.sha256(raw).hexdigest()}\n" in out
    assert hashlib.sha256(text.encode("utf-8")).hexdigest() not in out


def test_body_is_lf_only_with_exactly_one_trailing_newline() -> None:
    out = render_inbox_concept(
        "line one\r\nline two\r\n\n\n",
        okf_type="note",
        title="T",
        source_file="f.md",
        source_bytes=b"x",
        ingested_at=INGESTED_AT,
    )
    assert "\r" not in out
    assert out.endswith("line one\nline two\n")


def test_rendering_is_deterministic() -> None:
    kwargs = {
        "okf_type": "note",
        "title": "T",
        "source_file": "f.md",
        "source_bytes": b"x",
        "ingested_at": INGESTED_AT,
    }
    assert render_inbox_concept("body", **kwargs) == render_inbox_concept("body", **kwargs)


# --- fail-fast gates ---


@pytest.mark.parametrize("moment", ["2026-07-25", "2026-07-25T12:00:00", "not-a-time", ""])
def test_ingested_at_must_be_iso_8601_utc_with_a_z_suffix(moment: str) -> None:
    with pytest.raises(MaterializationError) as excinfo:
        render_inbox_concept(
            "body",
            okf_type="note",
            title="T",
            source_file="f.md",
            source_bytes=b"x",
            ingested_at=moment,
        )
    assert excinfo.value.code == "ingested_at_invalid"


@pytest.mark.parametrize("okf_type", ["verdict", "Verdict", "VERDICT"])
def test_verdict_okf_type_rejected(okf_type: str) -> None:
    """Verdict reservation, second door: the promotion gate remains the only
    path into that layer — the inbox can never write one.
    """
    with pytest.raises(MaterializationError) as excinfo:
        render_inbox_concept(
            "body",
            okf_type=okf_type,
            title="T",
            source_file="f.md",
            source_bytes=b"x",
            ingested_at=INGESTED_AT,
        )
    assert excinfo.value.code == "okf_type_reserved"


@pytest.mark.parametrize("title", ["a[b", "a]b", "two\nlines", "carriage\rreturn"])
def test_title_that_would_break_an_index_link_or_frontmatter_rejected(title: str) -> None:
    # Same invariant as Door A's manifest validation: the title is rendered
    # verbatim into `- [title](target)` and into line-oriented frontmatter.
    with pytest.raises(MaterializationError) as excinfo:
        render_inbox_concept(
            "body",
            okf_type="note",
            title=title,
            source_file="f.md",
            source_bytes=b"x",
            ingested_at=INGESTED_AT,
        )
    assert excinfo.value.code == "inbox_title_invalid"


@pytest.mark.parametrize("source_file", ["two\nlines.md", "carriage\rreturn.md"])
def test_source_file_that_would_inject_frontmatter_lines_rejected(source_file: str) -> None:
    with pytest.raises(MaterializationError) as excinfo:
        render_inbox_concept(
            "body",
            okf_type="note",
            title="T",
            source_file=source_file,
            source_bytes=b"x",
            ingested_at=INGESTED_AT,
        )
    assert excinfo.value.code == "inbox_source_file_invalid"