import pathlib
import subprocess
import sys
import tempfile
import unittest


SCRIPT = pathlib.Path(__file__).resolve().parents[1] / "scripts" / "fix_markdown_titles.py"


def run_cli(*args):
    return subprocess.run(
        [sys.executable, str(SCRIPT), *args],
        text=True,
        capture_output=True,
        check=False,
    )


class FixMarkdownTitlesTest(unittest.TestCase):
    def test_shifts_atx_headings_and_leaves_code_blocks(self):
        with tempfile.TemporaryDirectory() as tmp:
            target = pathlib.Path(tmp) / "reply.md"
            target.write_text(
                "\n".join(
                    [
                        "Intro",
                        "",
                        "# One",
                        "## Two ##",
                        "```md",
                        "# Not a heading",
                        "```",
                        "> # quoted content",
                        "    # indented code",
                        "###### Six",
                        "",
                    ]
                ),
                encoding="utf-8",
            )

            result = run_cli(str(target), "--levels", "2")

            self.assertEqual(result.returncode, 0, result.stderr)
            self.assertEqual(
                target.read_text(encoding="utf-8"),
                "\n".join(
                    [
                        "Intro",
                        "",
                        "### One",
                        "#### Two ##",
                        "```md",
                        "# Not a heading",
                        "```",
                        "> # quoted content",
                        "    # indented code",
                        "###### Six",
                        "",
                    ]
                ),
            )

    def test_dry_run_prints_without_writing(self):
        with tempfile.TemporaryDirectory() as tmp:
            target = pathlib.Path(tmp) / "reply.md"
            target.write_text("# One\n", encoding="utf-8")

            result = run_cli(str(target), "--levels", "1", "--dry-run")

            self.assertEqual(result.returncode, 0, result.stderr)
            self.assertEqual(result.stdout, "## One\n")
            self.assertEqual(target.read_text(encoding="utf-8"), "# One\n")

    def test_output_writes_to_separate_file(self):
        with tempfile.TemporaryDirectory() as tmp:
            source = pathlib.Path(tmp) / "reply.md"
            output = pathlib.Path(tmp) / "fixed.md"
            source.write_text("# One\n", encoding="utf-8")

            result = run_cli(str(source), "--levels", "3", "--output", str(output))

            self.assertEqual(result.returncode, 0, result.stderr)
            self.assertEqual(source.read_text(encoding="utf-8"), "# One\n")
            self.assertEqual(output.read_text(encoding="utf-8"), "#### One\n")

    def test_rejects_non_positive_levels(self):
        with tempfile.TemporaryDirectory() as tmp:
            target = pathlib.Path(tmp) / "reply.md"
            target.write_text("# One\n", encoding="utf-8")

            result = run_cli(str(target), "--levels", "0")

            self.assertNotEqual(result.returncode, 0)
            self.assertIn("positive integer", result.stderr)


if __name__ == "__main__":
    unittest.main()