from __future__ import annotations

from pathlib import Path

from pdf2md.ir import (
    AssetRecord,
    BlockRecord,
    BlockType,
    DocumentRecord,
    PageRecord,
    TextFidelityRecord,
    WarningCode,
    WarningRecord,
    WarningSeverity,
)
from pdf2md.metadata import build_metadata
from pdf2md.quality import QualityResult
from pdf2md.report import determine_final_status, pages_with_warnings, render_report


def make_metadata(tmp_path: Path, *, warnings: tuple[WarningRecord, ...] = ()) -> dict[str, object]:
    document = DocumentRecord(
        source_pdf=tmp_path / "paper.pdf",
        pages=(
            PageRecord(
                page_index=0,
                blocks=(
                    BlockRecord(BlockType.INLINE_FORMULA, page_index=0),
                    BlockRecord(BlockType.DISPLAY_FORMULA, page_index=0),
                ),
            ),
            PageRecord(page_index=1, blocks=(BlockRecord(BlockType.PARAGRAPH, page_index=1),)),
        ),
        assets=(AssetRecord("paper.assets/fig.png", page_index=1),),
        warnings=warnings,
    )
    return build_metadata(
        document=document,
        source_sha256="0" * 64,
        created_at="2026-05-08T00:00:00Z",
        engine="MinerU",
        engine_version="3.1.0",
        engine_options={"strict_local": True},
    )


def test_final_status_success_partial_and_failed(tmp_path: Path) -> None:
    success_metadata = make_metadata(tmp_path)
    warning_metadata = make_metadata(
        tmp_path,
        warnings=(WarningRecord(WarningCode.READING_ORDER_UNCERTAIN, WarningSeverity.WARNING, "Review page.", page_index=1),),
    )
    failed_metadata = make_metadata(
        tmp_path,
        warnings=(WarningRecord(WarningCode.MINERU_CLI_FAILED, WarningSeverity.ERROR, "MinerU failed."),),
    )

    assert determine_final_status(success_metadata) == "success"
    assert determine_final_status(warning_metadata) == "partial"
    assert determine_final_status(success_metadata, QualityResult(missing_asset_link_count=1)) == "partial"
    assert determine_final_status(failed_metadata) == "failed"


def test_pages_with_warnings_are_sorted_and_derived_from_metadata_and_quality(tmp_path: Path) -> None:
    metadata = make_metadata(
        tmp_path,
        warnings=(WarningRecord(WarningCode.READING_ORDER_UNCERTAIN, WarningSeverity.WARNING, "Review page.", page_index=1),),
    )
    quality = QualityResult(
        warnings=(WarningRecord(WarningCode.MATH_RENDER_FAILED, WarningSeverity.WARNING, "Math failed.", page_index=0),)
    )

    assert pages_with_warnings(metadata, quality) == (0, 1)


def test_report_content_includes_required_sections_and_counts(tmp_path: Path) -> None:
    metadata = make_metadata(
        tmp_path,
        warnings=(WarningRecord(WarningCode.READING_ORDER_UNCERTAIN, WarningSeverity.WARNING, "Review page.", page_index=1),),
    )
    quality = QualityResult(
        missing_asset_link_count=2,
        invalid_asset_link_count=1,
        math_render_error_count=3,
        warnings=(WarningRecord(WarningCode.ASSET_LINK_MISSING, WarningSeverity.WARNING, "Missing asset."),),
    )

    report = render_report(
        metadata,
        quality=quality,
        markdown_path=tmp_path / "paper.md",
        metadata_path=tmp_path / "paper.metadata.json",
        report_path=tmp_path / "paper.report.md",
    )

    assert "# PDF-to-Markdown Quality Report" in report
    assert "- Final status: `partial`" in report
    assert f"- Source PDF: {tmp_path / 'paper.pdf'}" in report
    assert f"- Output Markdown: {tmp_path / 'paper.md'}" in report
    assert "- Engine: MinerU" in report
    assert "- Engine version: 3.1.0" in report
    assert '- Engine options: `{"strict_local": true}`' in report
    assert "- Pages processed: 2" in report
    assert "- Warning count: 2" in report
    assert "- Asset count: 1" in report
    assert "- Missing asset link count: 2" in report
    assert "- Invalid asset link count: 1" in report
    assert "- Inline formula count: 1" in report
    assert "- Display formula count: 1" in report
    assert "- Math render error count: 3" in report
    assert "- Page 1" in report
    assert "`ASSET_LINK_MISSING`" in report


def test_report_omits_absent_optional_paths_and_does_not_write_files(tmp_path: Path) -> None:
    metadata = make_metadata(tmp_path)
    report_path = tmp_path / "paper.report.md"

    report = render_report(metadata)

    assert "Output Markdown:" not in report
    assert "Metadata JSON:" not in report
    assert "Report Markdown:" not in report
    assert not report_path.exists()


def test_report_failed_status_comes_from_error_severity_warning(tmp_path: Path) -> None:
    metadata = make_metadata(
        tmp_path,
        warnings=(WarningRecord(WarningCode.MINERU_CLI_FAILED, WarningSeverity.ERROR, "MinerU failed."),),
    )

    report = render_report(metadata)

    assert "- Final status: `failed`" in report


def test_report_uses_metadata_math_render_count_plus_quality_count(tmp_path: Path) -> None:
    metadata = make_metadata(
        tmp_path,
        warnings=(WarningRecord(WarningCode.MATH_RENDER_FAILED, WarningSeverity.ERROR, "Metadata math failed."),),
    )
    quality = QualityResult(math_render_error_count=2)

    report = render_report(metadata, quality=quality)

    assert "- Math render error count: 3" in report


def test_report_includes_chunk_context_when_metadata_has_chunk_options(tmp_path: Path) -> None:
    metadata = make_metadata(tmp_path)
    metadata["engine_options"] = {
        "strict_local": True,
        "chunk": {
            "chunk_index": 2,
            "total_chunks": 3,
            "source_page_start": 21,
            "source_page_end": 40,
        },
    }

    report = render_report(metadata)

    assert "- Chunk: 2/3, source pages: 21-40" in report


def test_report_includes_single_page_conversion_context(tmp_path: Path) -> None:
    metadata = make_metadata(tmp_path)
    metadata["engine_options"] = {
        "strict_local": True,
        "page_conversion": {
            "mode": "single_page",
            "mineru_input_page_count": 1,
            "output_group_page_count": 20,
            "failed_source_pages": [],
        },
    }

    report = render_report(metadata)

    assert "- Page conversion mode: single-page MinerU inputs, grouped output size: 20" in report


def test_report_includes_aggregate_output_folder_and_markdown_parts(tmp_path: Path) -> None:
    metadata = make_metadata(tmp_path)
    metadata["engine_options"] = {
        "strict_local": True,
        "output_folder": str(tmp_path / "out" / "paper"),
        "parts": [
            {
                "index": 1,
                "total": 2,
                "source_page_start": 1,
                "source_page_end": 20,
                "markdown_path": str(tmp_path / "out" / "paper" / "paper_001.md"),
                "status": "success",
                "warning_count": 0,
            },
            {
                "index": 2,
                "total": 2,
                "source_page_start": 21,
                "source_page_end": 23,
                "markdown_path": None,
                "status": "failed",
                "warning_count": 2,
                "failed_source_pages": [22, 23],
            },
        ],
    }

    report = render_report(metadata)

    assert f"- Output folder: {tmp_path / 'out' / 'paper'}" in report
    assert "paper_001.md (source pages 1-20, status success)" in report
    assert "- Markdown part 2/2: unavailable (source pages 21-23, status failed)" in report
    assert "- Failed source pages for part 2: 22, 23" in report


def test_report_includes_text_fidelity_section_when_metadata_has_diagnostics(tmp_path: Path) -> None:
    document = DocumentRecord(
        source_pdf=tmp_path / "paper.pdf",
        pages=(PageRecord(page_index=0, blocks=(BlockRecord(BlockType.PARAGRAPH),)),),
        text_fidelity=(
            TextFidelityRecord(
                page_index=0,
                source_page_number=3,
                pypdf_text_available=True,
                markdown_text_available=True,
                pypdf_hangul_count=10,
                markdown_hangul_count=7,
                hangul_count_delta=-3,
                hangul_count_ratio=0.7,
                unexpected_cjk_count=2,
                pypdf_hangul_spacing_anomaly_ratio=0.0,
                markdown_hangul_spacing_anomaly_ratio=0.0,
                text_similarity=0.61,
                replacement_candidate=True,
                comparison_status="checked",
            ),
            TextFidelityRecord(
                page_index=1,
                source_page_number=4,
                pypdf_text_available=True,
                markdown_text_available=False,
                pypdf_hangul_count=5,
                markdown_hangul_count=0,
                hangul_count_delta=-5,
                hangul_count_ratio=0.0,
                unexpected_cjk_count=0,
                pypdf_hangul_spacing_anomaly_ratio=0.0,
                markdown_hangul_spacing_anomaly_ratio=0.0,
                text_similarity=0.0,
                replacement_candidate=False,
                comparison_status="page_mapping_uncertain",
            ),
        ),
    )
    metadata = build_metadata(
        document=document,
        source_sha256="0" * 64,
        created_at="2026-05-11T00:00:00Z",
        engine="MinerU",
        engine_version="3.1.0",
    )

    report = render_report(metadata)

    assert "## Text Fidelity" in report
    assert "- Checked page count: 1" in report
    assert "- Low-fidelity page count: 1" in report
    assert "- Unexpected CJK count: 2" in report
    assert "- Replacement candidate page count: 1" in report
    assert "- Low-similarity pages: 0" in report
    assert "- Unexpected-CJK pages: 0" in report
    assert "- Uncertain page-mapping pages: 1" in report