"""Tests for CLI routing and parser behavior."""

import pytest

from coinhunter.cli import ALIASES, MODULE_MAP, build_parser, run_python_module


class TestAliases:
    def test_all_aliases_resolve_to_canonical(self):
        for alias, canonical in ALIASES.items():
            assert canonical in MODULE_MAP, f"alias {alias!r} points to missing canonical {canonical!r}"

    def test_no_alias_is_itself_an_alias_loop(self):
        for alias in ALIASES:
            assert alias not in ALIASES.values() or alias in MODULE_MAP


class TestModuleMap:
    def test_all_modules_exist(self):
        import importlib

        for command, module_name in MODULE_MAP.items():
            full = f"coinhunter.{module_name}"
            mod = importlib.import_module(full)
            assert hasattr(mod, "main"), f"{full} missing main()"


class TestBuildParser:
    def test_help_includes_commands(self):
        parser = build_parser()
        help_text = parser.format_help()
        assert "coinhunter diag" in help_text
        assert "coinhunter exec" in help_text

    def test_parses_command_and_args(self):
        parser = build_parser()
        ns = parser.parse_args(["exec", "bal"])
        assert ns.command == "exec"
        assert "bal" in ns.args

    def test_version_action_exits(self):
        parser = build_parser()
        with pytest.raises(SystemExit) as exc:
            parser.parse_args(["--version"])
        assert exc.value.code == 0


class TestRunPythonModule:
    def test_runs_module_main_and_returns_int(self):
        result = run_python_module("commands.paths", [], "coinhunter paths")
        assert result == 0

    def test_mutates_sys_argv(self):
        import sys

        original = sys.argv[:]
        run_python_module("commands.paths", ["--help"], "coinhunter paths")
        assert sys.argv == original