"""Door B extraction registry: file bytes -> text, per file type (Phase 2 step 1).

Core stdlib extractors (md/txt/csv/json/html) plus the fail-fast gates: unknown
extension, the [extract]-gated binary types when the extra is absent, corrupt
(non-UTF-8) bytes, and an empty CSV. All file-type->text extraction lives HERE
(the guard is text-only); this step adds zero runtime dependency and no guard
call — it is pure, deterministic plumbing.
"""

from __future__ import annotations

import pytest

from llm_ingestion_okf import ExtractionError, extract_text

# --- core extractors: happy path (a fixture per type) ---


def test_md_passthrough() -> None:
    assert extract_text("note.md", b"# Title\n\nBody\n") == "# Title\n\nBody\n"


def test_txt_passthrough() -> None:
    assert extract_text("note.txt", b"plain text") == "plain text"


def test_utf8_sig_bom_is_stripped() -> None:
    # utf-8-sig so a BOM never leaks into the first character (baseline parity
    # with Door A's read_csv).
    assert extract_text("note.txt", b"\xef\xbb\xbfhello") == "hello"


def test_csv_renders_the_phase_1_markdown_table() -> None:
    out = extract_text("data.csv", b"name,age\nAda,36\n")
    assert out == "| name | age |\n| --- | --- |\n| Ada | 36 |\n"


def test_json_is_verbatim_inside_a_fenced_block() -> None:
    out = extract_text("cfg.json", b'{"k": 1}\n')
    assert out == '```\n{"k": 1}\n```\n'


def test_html_text_via_htmlparser() -> None:
    # Block boundaries separate words; tags themselves contribute no text.
    out = extract_text("page.html", b"<h1>Title</h1><p>Hello <b>world</b></p>")
    assert out == "Title Hello world"


def test_html_skips_script_and_style() -> None:
    html = b"<style>.x{color:red}</style><p>Keep</p><script>evil()</script>"
    assert extract_text("page.html", html) == "Keep"


def test_htm_is_an_html_alias() -> None:
    assert extract_text("page.htm", b"<p>hi</p>") == "hi"


def test_extension_dispatch_is_case_insensitive() -> None:
    assert extract_text("NOTE.MD", b"x") == "x"


# --- fail-fast: unknown extension ---


def test_unknown_extension_fails_fast() -> None:
    with pytest.raises(ExtractionError) as excinfo:
        extract_text("archive.zip", b"PK\x03\x04")
    assert excinfo.value.code == "extractor_unknown"


def test_missing_extension_fails_fast() -> None:
    with pytest.raises(ExtractionError) as excinfo:
        extract_text("README", b"x")
    assert excinfo.value.code == "extractor_unknown"


# --- fail-fast: [extract]-gated binary types without the extra ---


@pytest.mark.parametrize("name", ["doc.pdf", "doc.docx", "sheet.xlsx"])
def test_optional_type_without_extra_fails_fast(name: str) -> None:
    with pytest.raises(ExtractionError) as excinfo:
        extract_text(name, b"binary")
    assert excinfo.value.code == "extractor_extra_missing"
    # The error names the extra so the operator knows the remedy — never a
    # silent skip, never a bundled parser in core.
    assert "extract" in str(excinfo.value)


# --- fail-fast: corrupt (non-UTF-8) bytes on a text type ---


def test_invalid_utf8_fails_fast_typed() -> None:
    # Never a leaked UnicodeDecodeError — the "always typed" doctrine holds for
    # Door B too (cf. Door A wrapping path ValueError as SourceError).
    with pytest.raises(ExtractionError) as excinfo:
        extract_text("note.txt", b"\xffbad")
    assert excinfo.value.code == "extractor_decode_error"


# --- fail-fast: empty CSV (no header row) ---


def test_empty_csv_fails_fast() -> None:
    with pytest.raises(ExtractionError) as excinfo:
        extract_text("empty.csv", b"")
    assert excinfo.value.code == "extractor_empty_csv"