"""
Unit tests for DocxConverterWithOCR.

For each DOCX test file: convert with a mock OCR service then compare the
full output string against the expected snapshot.

OCR block format used by the converter:
    *[Image OCR]
    MOCK_OCR_TEXT_12345
    [End OCR]*
"""

import sys
from pathlib import Path
from typing import Any

import pytest

sys.path.insert(0, str(Path(__file__).parent.parent / "src"))

from markitdown_ocr._ocr_service import OCRResult  # noqa: E402
from markitdown_ocr._docx_converter_with_ocr import (  # noqa: E402
    DocxConverterWithOCR,
)
from markitdown import StreamInfo  # noqa: E402

TEST_DATA_DIR = Path(__file__).parent / "ocr_test_data"

_MOCK_TEXT = "MOCK_OCR_TEXT_12345"


class MockOCRService:
    def extract_text(  # noqa: ANN101
        self, image_stream: Any, **kwargs: Any
    ) -> OCRResult:
        return OCRResult(text=_MOCK_TEXT, backend_used="mock")


@pytest.fixture(scope="module")
def svc() -> MockOCRService:
    return MockOCRService()


def _convert(filename: str, ocr_service: MockOCRService) -> str:
    path = TEST_DATA_DIR / filename
    if not path.exists():
        pytest.skip(f"Test file not found: {path}")
    converter = DocxConverterWithOCR()
    with open(path, "rb") as f:
        return converter.convert(
            f, StreamInfo(extension=".docx"), ocr_service=ocr_service
        ).text_content


# ---------------------------------------------------------------------------
# docx_image_start.docx
# ---------------------------------------------------------------------------


def test_docx_image_start(svc: MockOCRService) -> None:
    expected = (
        "Document with Image at Start\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*\n\n"
        "This is the main content after the header image.\n\n"
        "More text content here."
    )
    assert _convert("docx_image_start.docx", svc) == expected


# ---------------------------------------------------------------------------
# docx_image_middle.docx
# ---------------------------------------------------------------------------


def test_docx_image_middle(svc: MockOCRService) -> None:
    expected = (
        "# Introduction\n\n"
        "This is the introduction section.\n\n"
        "We will see an image below.\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*\n\n"
        "# Analysis\n\n"
        "This section comes after the image."
    )
    assert _convert("docx_image_middle.docx", svc) == expected


# ---------------------------------------------------------------------------
# docx_image_end.docx
# ---------------------------------------------------------------------------


def test_docx_image_end(svc: MockOCRService) -> None:
    expected = (
        "Report\n\n"
        "Main findings of the report.\n\n"
        "Details and analysis.\n\n"
        "Recommendations.\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*"
    )
    assert _convert("docx_image_end.docx", svc) == expected


# ---------------------------------------------------------------------------
# docx_multiple_images.docx
# ---------------------------------------------------------------------------


def test_docx_multiple_images(svc: MockOCRService) -> None:
    expected = (
        "Multi-Image Document\n\n"
        "First section\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*\n\n"
        "Second section with another image\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*\n\n"
        "Conclusion"
    )
    assert _convert("docx_multiple_images.docx", svc) == expected


# ---------------------------------------------------------------------------
# docx_multipage.docx
# ---------------------------------------------------------------------------


def test_docx_multipage(svc: MockOCRService) -> None:
    expected = (
        "# Page 1 - Mixed Content\n\n"
        "This is the first paragraph on page 1.\n\n"
        "BEFORE IMAGE: Important content appears here.\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*\n\n"
        "AFTER IMAGE: This content follows the image.\n\n"
        "More text on page 1.\n\n"
        "# Page 2 - Image at End\n\n"
        "Content on page 2.\n\n"
        "Multiple paragraphs of text.\n\n"
        "Building up to the image...\n\n"
        "Final paragraph before image.\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*\n\n"
        "# Page 3 - Image at Start\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*\n\n"
        "Content that follows the header image.\n\n"
        "AFTER IMAGE: This text is after the image."
    )
    assert _convert("docx_multipage.docx", svc) == expected


# ---------------------------------------------------------------------------
# docx_complex_layout.docx
# ---------------------------------------------------------------------------


def test_docx_complex_layout(svc: MockOCRService) -> None:
    expected = (
        "Complex Document\n\n"
        "|  |  |\n"
        "| --- | --- |\n"
        "| Feature | Status |\n"
        "| Authentication | Active |\n"
        "| Encryption | Enabled |\n\n"
        "Security notice:\n\n"
        "*[Image OCR]\nMOCK_OCR_TEXT_12345\n[End OCR]*"
    )
    assert _convert("docx_complex_layout.docx", svc) == expected


# ---------------------------------------------------------------------------
# _inject_placeholders — internal unit tests (no file I/O)
# ---------------------------------------------------------------------------


def test_inject_placeholders_single_image() -> None:
    converter = DocxConverterWithOCR()
    html = "<p>Before</p><img src='x.png'/><p>After</p>"
    result_html, texts = converter._inject_placeholders(html, {"rId1": "TEXT"})
    assert "<img" not in result_html
    assert "MARKITDOWNOCRBLOCK0" in result_html
    assert texts == ["TEXT"]


def test_inject_placeholders_two_images_sequential_tokens() -> None:
    converter = DocxConverterWithOCR()
    html = "<img src='a.png'/><p>Mid</p><img src='b.png'/>"
    result_html, texts = converter._inject_placeholders(
        html, {"rId1": "FIRST", "rId2": "SECOND"}
    )
    assert "MARKITDOWNOCRBLOCK0" in result_html
    assert "MARKITDOWNOCRBLOCK1" in result_html
    assert result_html.index("MARKITDOWNOCRBLOCK0") < result_html.index(
        "MARKITDOWNOCRBLOCK1"
    )
    assert len(texts) == 2


def test_inject_placeholders_no_img_tag_appends_at_end() -> None:
    converter = DocxConverterWithOCR()
    html = "<p>No images</p>"
    result_html, texts = converter._inject_placeholders(html, {"rId1": "ORPHAN"})
    assert "MARKITDOWNOCRBLOCK0" in result_html
    assert texts == ["ORPHAN"]


def test_inject_placeholders_empty_map_leaves_html_unchanged() -> None:
    converter = DocxConverterWithOCR()
    html = "<p>Content</p><img src='pic.jpg'/>"
    result_html, texts = converter._inject_placeholders(html, {})
    assert result_html == html
    assert texts == []


# ---------------------------------------------------------------------------
# No OCR service — no OCR tags emitted
# ---------------------------------------------------------------------------


def test_docx_no_ocr_service_no_tags() -> None:
    path = TEST_DATA_DIR / "docx_image_middle.docx"
    if not path.exists():
        pytest.skip(f"Test file not found: {path}")
    converter = DocxConverterWithOCR()
    with open(path, "rb") as f:
        md = converter.convert(f, StreamInfo(extension=".docx")).text_content
    assert "*[Image OCR]" not in md
    assert "[End OCR]*" not in md