#!/usr/bin/env python3

from contextlib import redirect_stdout
import io
from pathlib import Path
import sys
import unittest
from unittest.mock import patch

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

import setup_dev_execpolicy


class SetupDevExecpolicyTest(unittest.TestCase):
    def test_discovers_absolute_paths_without_resolving_them(self) -> None:
        paths = {
            "cargo": "/tools/bin/cargo",
            "just": "/tools/bin/just",
        }

        self.assertEqual(
            setup_dev_execpolicy.discover_host_executables(
                tuple(paths),
                which=paths.get,
            ),
            {
                "cargo": Path("/tools/bin/cargo"),
                "just": Path("/tools/bin/just"),
            },
        )

    def test_reports_all_missing_executables(self) -> None:
        with self.assertRaisesRegex(
            RuntimeError,
            "missing required host executables on PATH: just, pnpm",
        ):
            setup_dev_execpolicy.discover_host_executables(
                ("cargo", "just", "pnpm"),
                which=lambda name: "/tools/bin/cargo" if name == "cargo" else None,
            )

    def test_renders_host_executable_rules(self) -> None:
        self.assertEqual(
            setup_dev_execpolicy.render_host_executable_rules(
                {
                    "cargo": Path("/tools/bin/cargo"),
                    "bazel": Path("/tools/bin/bazel"),
                }
            ),
            """# Generated by scripts/setup_dev_execpolicy.py. Do not edit.

host_executable(
    name = "cargo",
    paths = ["/tools/bin/cargo"],
)

host_executable(
    name = "bazel",
    paths = ["/tools/bin/bazel"],
)
""",
        )

    def test_main_prints_rules(self) -> None:
        executables = {"cargo": Path("/tools/bin/cargo")}
        stdout = io.StringIO()

        with (
            patch.object(
                setup_dev_execpolicy,
                "discover_host_executables",
                return_value=executables,
            ),
            redirect_stdout(stdout),
        ):
            result = setup_dev_execpolicy.main()

        self.assertEqual(result, 0)
        self.assertEqual(
            stdout.getvalue(),
            setup_dev_execpolicy.render_host_executable_rules(executables),
        )


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