from pathlib import Path

import pytest
from click.testing import CliRunner

from markitect_tool.cli import main
from markitect_tool.explode import (
    EXPLODE_MANIFEST_NAME,
    ExplodeError,
    explode_markdown_file,
    implode_markdown_directory,
)


ROUNDTRIP_DOC = """---
title: Explode Example
---

Opening text before the first heading.

# Intro

Intro body.

## Detail

Detail body.

# Later

Later body.
"""


def test_flat_explode_implode_roundtrips_exact_markdown(tmp_path: Path):
    source = tmp_path / "source.md"
    output_dir = tmp_path / "exploded"
    source.write_text(ROUNDTRIP_DOC, encoding="utf-8")

    result = explode_markdown_file(source, output_dir, variant="flat")
    imploded = implode_markdown_directory(output_dir)

    assert Path(result.manifest_path).name == EXPLODE_MANIFEST_NAME
    assert (output_dir / "00-preamble.md").exists()
    assert (output_dir / "sections" / "01-intro.md").exists()
    assert imploded.markdown == ROUNDTRIP_DOC
    assert imploded.current_hash == result.manifest.source_hash


def test_hierarchical_explode_places_child_sections_under_parent(tmp_path: Path):
    source = tmp_path / "source.md"
    output_dir = tmp_path / "exploded"
    source.write_text(ROUNDTRIP_DOC, encoding="utf-8")

    result = explode_markdown_file(source, output_dir, variant="hierarchical")

    files = {Path(path).relative_to(output_dir).as_posix() for path in result.written_files}
    assert "01-intro.md" in files
    assert "01-intro/02-detail.md" in files
    assert implode_markdown_directory(output_dir).markdown == ROUNDTRIP_DOC


def test_explode_rejects_non_empty_output_without_force(tmp_path: Path):
    source = tmp_path / "source.md"
    output_dir = tmp_path / "exploded"
    output_dir.mkdir()
    (output_dir / "existing.md").write_text("Existing", encoding="utf-8")
    source.write_text(ROUNDTRIP_DOC, encoding="utf-8")

    with pytest.raises(ExplodeError, match="not empty"):
        explode_markdown_file(source, output_dir)


def test_mkt_explode_and_implode(tmp_path: Path):
    source = tmp_path / "source.md"
    output_dir = tmp_path / "exploded"
    rebuilt = tmp_path / "rebuilt.md"
    source.write_text(ROUNDTRIP_DOC, encoding="utf-8")
    runner = CliRunner()

    explode_result = runner.invoke(
        main,
        ["explode", str(source), "--output-dir", str(output_dir), "--variant", "flat"],
    )
    implode_result = runner.invoke(
        main,
        ["implode", str(output_dir), "--output", str(rebuilt)],
    )

    assert explode_result.exit_code == 0
    assert "entries: 4" in explode_result.output
    assert implode_result.exit_code == 0
    assert rebuilt.read_text(encoding="utf-8") == ROUNDTRIP_DOC