"""Tests for Packet S4: CmdForge CLI integration with agent-harness-setup."""

import json
from pathlib import Path
from types import SimpleNamespace
from unittest.mock import MagicMock, patch

import pytest

from cmdforge.cli import main
from cmdforge.cli.provider_commands import _find_setup_helper, _get_provider_defaults_for_harness
from cmdforge.providers import Provider, get_provider, load_providers, save_providers


@pytest.fixture
def temp_providers_file(tmp_path):
    providers_file = tmp_path / ".cmdforge" / "providers.yaml"
    with patch("cmdforge.providers.PROVIDERS_FILE", providers_file):
        save_providers([])
        yield providers_file


def _mock_helper_run(status: str, harness_id: str = "claude-code", exit_code: int = 0, diagnostics: str | None = None, executable_path: str = "/usr/local/bin/claude"):
    """Create a mock subprocess.run that writes a valid completion result to --result-file."""
    def _run(cmd, *args, **kwargs):
        # Extract --result-file and --request-id from cmd
        res_idx = cmd.index("--result-file")
        result_file_path = Path(cmd[res_idx + 1])
        req_idx = cmd.index("--request-id")
        request_id = cmd[req_idx + 1]

        data = {
            "schema_version": 1,
            "helper_version": "0.1.0",
            "request_id": request_id,
            "timestamp": "2026-09-11T22:00:00Z",
            "status": status,
            "harness_id": harness_id,
            "recipe_id": harness_id,
            "recipe_version": "2026-09-10",
            "install_method": "argv",
            "installer_exit_code": 0 if status == "success" else None,
            "verification": {
                "verified": True,
                "executable_path": executable_path,
                "version_output": f"{harness_id} 1.0.0",
            } if status == "success" else None,
            "path_updates": ["/usr/local/bin"],
            "auth_status": "setup_required",
            "manual_steps_remaining": ["Run 'claude' to complete browser sign-in."],
            "partial_changes": {
                "observed_created": [executable_path] if status == "success" else [],
                "observed_modified": [],
                "unknown_changes": True,
            },
            "error_diagnostics": diagnostics,
        }
        result_file_path.write_text(json.dumps(data), encoding="utf-8")
        return SimpleNamespace(returncode=exit_code)

    return _run


def test_helper_discovery_finds_executable():
    """Verify _find_setup_helper locates agent-harness-setup."""
    with patch("shutil.which", return_value="/usr/local/bin/agent-harness-setup"):
        helper = _find_setup_helper()
        assert helper == ["/usr/local/bin/agent-harness-setup"]


def test_get_provider_defaults_for_claude():
    """Verify provider defaults derived for claude-code."""
    defaults = _get_provider_defaults_for_harness("claude-code", "/custom/bin/claude")
    assert defaults["name"] == "claude"
    assert defaults["command"] == "/custom/bin/claude -p"
    assert "Claude" in defaults["description"]


def test_providers_install_verified_success_registers_provider(temp_providers_file, capsys):
    """Test verified installation prompts and registers provider in providers.yaml."""
    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=["agent-harness-setup"]),
        patch("subprocess.run", side_effect=_mock_helper_run("success", "claude-code", 0)) as mock_run,
        patch("builtins.input", return_value="y"),
        patch("sys.argv", ["cmdforge", "providers", "install", "--harness", "claude-code"]),
    ):
        exit_code = main()

    assert exit_code == 0
    captured = capsys.readouterr()
    assert "Harness Setup Verified: claude-code" in captured.out
    assert "Provider 'claude' successfully added" in captured.out

    # Verify provider stored in providers.yaml
    provider = get_provider("claude")
    assert provider is not None
    assert provider.command == "/usr/local/bin/claude -p"
    assert "code" in provider.tags

    # Verify subprocess invocation arguments
    call_args = mock_run.call_args[0][0]
    assert call_args[0] == "agent-harness-setup"
    assert "--result-file" in call_args
    assert "--request-id" in call_args
    assert "--harness" in call_args
    assert "claude-code" in call_args


def test_providers_install_declined_registration(temp_providers_file, capsys):
    """Test declining the provider registration prompt leaves providers.yaml unchanged."""
    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=["agent-harness-setup"]),
        patch("subprocess.run", side_effect=_mock_helper_run("success", "claude-code", 0)),
        patch("builtins.input", return_value="n"),
        patch("sys.argv", ["cmdforge", "providers", "install"]),
    ):
        exit_code = main()

    assert exit_code == 0
    captured = capsys.readouterr()
    assert "Harness Setup Verified: claude-code" in captured.out
    assert "Skipped provider registration" in captured.out

    assert get_provider("claude") is None


def test_providers_install_already_configured(temp_providers_file, capsys):
    """Test that existing provider is recognized and not re-registered."""
    save_providers([Provider("claude", "existing-claude -p")])

    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=["agent-harness-setup"]),
        patch("subprocess.run", side_effect=_mock_helper_run("success", "claude-code", 0)),
        patch("sys.argv", ["cmdforge", "providers", "install"]),
    ):
        exit_code = main()

    assert exit_code == 0
    captured = capsys.readouterr()
    assert "already configured in ~/.cmdforge/providers.yaml" in captured.out
    assert get_provider("claude").command == "existing-claude -p"


def test_providers_install_cancelled(temp_providers_file, capsys):
    """Test cancellation exits cleanly without changing providers."""
    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=["agent-harness-setup"]),
        patch("subprocess.run", side_effect=_mock_helper_run("cancelled", "claude-code", 10)),
        patch("sys.argv", ["cmdforge", "providers", "install"]),
    ):
        exit_code = main()

    assert exit_code == 0
    captured = capsys.readouterr()
    assert "Setup cancelled. No provider configuration was changed." in captured.out
    assert get_provider("claude") is None


def test_providers_install_execution_failure(temp_providers_file, capsys):
    """Test helper failure reports error diagnostics and does not register provider."""
    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=["agent-harness-setup"]),
        patch("subprocess.run", side_effect=_mock_helper_run("failed", "claude-code", 1, "Missing node.js")),
        patch("sys.argv", ["cmdforge", "providers", "install"]),
    ):
        exit_code = main()

    assert exit_code == 1
    captured = capsys.readouterr()
    assert "Setup failed: Missing node.js" in captured.out
    assert get_provider("claude") is None


def test_providers_install_incoherent_result_rejected(temp_providers_file, capsys):
    """Test exit code 1 with status 'success' is rejected as incoherent."""
    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=["agent-harness-setup"]),
        patch("subprocess.run", side_effect=_mock_helper_run("success", "claude-code", 1)),
        patch("sys.argv", ["cmdforge", "providers", "install"]),
    ):
        exit_code = main()

    assert exit_code == 1
    captured = capsys.readouterr()
    assert "Treating as failure" in captured.out
    assert get_provider("claude") is None


def test_providers_install_helper_not_found(temp_providers_file, capsys):
    """Test that missing helper prints actionable instructions without crashing."""
    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=None),
        patch("sys.argv", ["cmdforge", "providers", "install"]),
    ):
        exit_code = main()

    assert exit_code == 0
    captured = capsys.readouterr()
    assert "agent-harness-setup" in captured.out
    assert "pip install" in captured.out
    assert "PYTHONPATH=" in captured.out


def test_providers_install_dry_run(temp_providers_file, capsys):
    """Test --dry-run passes flag to helper and makes no provider changes."""
    with (
        patch("cmdforge.cli.provider_commands._find_setup_helper", return_value=["agent-harness-setup"]),
        patch("subprocess.run", side_effect=_mock_helper_run("dry_run", "claude-code", 0)) as mock_run,
        patch("sys.argv", ["cmdforge", "providers", "install", "--dry-run"]),
    ):
        exit_code = main()

    assert exit_code == 0
    call_args = mock_run.call_args[0][0]
    assert "--dry-run" in call_args
    assert get_provider("claude") is None