"""Unit tests for configuration management tools."""

import json
from unittest.mock import patch, MagicMock

import pytest


class TestRestoreServersFromConfig:
    """Tests for restore_servers_from_config function."""

    def test_restore_empty_config(self, patch_config_paths):
        """No servers to restore when config is empty."""
        from haproxy_mcp.tools.configuration import restore_servers_from_config

        result = restore_servers_from_config()

        assert result == 0

    def test_restore_servers_success(self, mock_socket_class, mock_select, patch_config_paths, sample_servers_config):
        """Restore servers successfully."""
        # Write config and map
        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(sample_servers_config, f)
        with open(patch_config_paths["map_file"], "w") as f:
            f.write("example.com pool_1\n")
            f.write("api.example.com pool_2\n")

        mock_sock = mock_socket_class(responses={
            "set server": "",
        })

        with patch("socket.socket", return_value=mock_sock):
            from haproxy_mcp.tools.configuration import restore_servers_from_config

            result = restore_servers_from_config()

        # example.com has 2 servers, api.example.com has 1
        assert result == 3

    def test_restore_servers_skip_missing_domain(self, mock_socket_class, mock_select, patch_config_paths):
        """Skip domains not in map file."""
        config = {"unknown.com": {"1": {"ip": "10.0.0.1", "http_port": 80}}}
        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(config, f)

        mock_sock = mock_socket_class(responses={"set server": ""})

        with patch("socket.socket", return_value=mock_sock):
            from haproxy_mcp.tools.configuration import restore_servers_from_config

            result = restore_servers_from_config()

        assert result == 0

    def test_restore_servers_skip_empty_ip(self, mock_socket_class, mock_select, patch_config_paths):
        """Skip servers with empty IP."""
        config = {"example.com": {"1": {"ip": "", "http_port": 80}}}
        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(config, f)
        with open(patch_config_paths["map_file"], "w") as f:
            f.write("example.com pool_1\n")

        mock_sock = mock_socket_class(responses={"set server": ""})

        with patch("socket.socket", return_value=mock_sock):
            from haproxy_mcp.tools.configuration import restore_servers_from_config

            result = restore_servers_from_config()

        assert result == 0


class TestStartupRestore:
    """Tests for startup_restore function."""

    def test_startup_restore_haproxy_not_ready(self, mock_select):
        """Skip restore if HAProxy is not ready."""
        call_count = 0

        def raise_error(*args, **kwargs):
            nonlocal call_count
            call_count += 1
            raise ConnectionRefusedError()

        with patch("socket.socket", side_effect=raise_error):
            with patch("haproxy_mcp.tools.configuration.STARTUP_RETRY_COUNT", 2):
                from haproxy_mcp.tools.configuration import startup_restore

                startup_restore()

        # Should have tried multiple times
        assert call_count >= 2

    def test_startup_restore_success(self, mock_socket_class, mock_select, patch_config_paths, response_builder):
        """Successfully restore servers and certificates on startup."""
        mock_sock = mock_socket_class(responses={
            "show info": response_builder.info(),
            "set server": "",
            "show ssl cert": "",
        })

        with patch("socket.socket", return_value=mock_sock):
            with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", return_value=0):
                with patch("haproxy_mcp.tools.certificates.restore_certificates", return_value=0):
                    from haproxy_mcp.tools.configuration import startup_restore

                    startup_restore()

        # No assertions needed - just verify no exceptions


class TestHaproxyReload:
    """Tests for haproxy_reload tool function."""

    def test_reload_success(self, mock_socket_class, mock_select, mock_subprocess, response_builder):
        """Reload HAProxy successfully."""
        mock_subprocess.return_value = MagicMock(returncode=0, stdout="", stderr="")
        mock_sock = mock_socket_class(responses={
            "show info": response_builder.info(),
            "set server": "",
        })

        with patch("socket.socket", return_value=mock_sock):
            with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", return_value=5):
                from haproxy_mcp.tools.configuration import register_config_tools
                mcp = MagicMock()
                registered_tools = {}

                def capture_tool():
                    def decorator(func):
                        registered_tools[func.__name__] = func
                        return func
                    return decorator

                mcp.tool = capture_tool
                register_config_tools(mcp)

                result = registered_tools["haproxy_reload"]()

        assert "reloaded successfully" in result
        assert "5 servers restored" in result

    def test_reload_validation_failure(self, mock_subprocess):
        """Reload fails on config validation error."""
        mock_subprocess.return_value = MagicMock(
            returncode=1,
            stdout="",
            stderr="Configuration error"
        )

        from haproxy_mcp.tools.configuration import register_config_tools
        mcp = MagicMock()
        registered_tools = {}

        def capture_tool():
            def decorator(func):
                registered_tools[func.__name__] = func
                return func
            return decorator

        mcp.tool = capture_tool
        register_config_tools(mcp)

        result = registered_tools["haproxy_reload"]()

        assert "validation failed" in result.lower() or "Configuration error" in result


class TestHaproxyCheckConfig:
    """Tests for haproxy_check_config tool function."""

    def test_check_config_valid(self, mock_subprocess):
        """Configuration is valid."""
        mock_subprocess.return_value = MagicMock(returncode=0, stdout="", stderr="")

        from haproxy_mcp.tools.configuration import register_config_tools
        mcp = MagicMock()
        registered_tools = {}

        def capture_tool():
            def decorator(func):
                registered_tools[func.__name__] = func
                return func
            return decorator

        mcp.tool = capture_tool
        register_config_tools(mcp)

        result = registered_tools["haproxy_check_config"]()

        assert "valid" in result.lower()

    def test_check_config_invalid(self, mock_subprocess):
        """Configuration has errors."""
        mock_subprocess.return_value = MagicMock(
            returncode=1,
            stdout="",
            stderr="[ALERT] Syntax error"
        )

        from haproxy_mcp.tools.configuration import register_config_tools
        mcp = MagicMock()
        registered_tools = {}

        def capture_tool():
            def decorator(func):
                registered_tools[func.__name__] = func
                return func
            return decorator

        mcp.tool = capture_tool
        register_config_tools(mcp)

        result = registered_tools["haproxy_check_config"]()

        assert "error" in result.lower()
        assert "Syntax error" in result

    def test_check_config_timeout(self, mock_subprocess):
        """Configuration check times out."""
        import subprocess
        mock_subprocess.side_effect = subprocess.TimeoutExpired("podman", 30)

        from haproxy_mcp.tools.configuration import register_config_tools
        mcp = MagicMock()
        registered_tools = {}

        def capture_tool():
            def decorator(func):
                registered_tools[func.__name__] = func
                return func
            return decorator

        mcp.tool = capture_tool
        register_config_tools(mcp)

        result = registered_tools["haproxy_check_config"]()

        assert "timed out" in result.lower()

    def test_check_config_podman_not_found(self, mock_subprocess):
        """Podman not found."""
        mock_subprocess.side_effect = FileNotFoundError()

        from haproxy_mcp.tools.configuration import register_config_tools
        mcp = MagicMock()
        registered_tools = {}

        def capture_tool():
            def decorator(func):
                registered_tools[func.__name__] = func
                return func
            return decorator

        mcp.tool = capture_tool
        register_config_tools(mcp)

        result = registered_tools["haproxy_check_config"]()

        assert "podman" in result.lower()
        assert "not found" in result.lower()


class TestHaproxySaveState:
    """Tests for haproxy_save_state tool function."""

    def test_save_state_success(self, mock_socket_class, mock_select, patch_config_paths, response_builder):
        """Save state successfully."""
        mock_sock = mock_socket_class(responses={
            "show servers state": response_builder.servers_state([
                {"be_name": "pool_1", "srv_name": "pool_1_1", "srv_addr": "10.0.0.1", "srv_port": 80},
            ]),
        })

        with patch("haproxy_mcp.tools.configuration.STATE_FILE", patch_config_paths["state_file"]):
            with patch("socket.socket", return_value=mock_sock):
                from haproxy_mcp.tools.configuration import register_config_tools
                mcp = MagicMock()
                registered_tools = {}

                def capture_tool():
                    def decorator(func):
                        registered_tools[func.__name__] = func
                        return func
                    return decorator

                mcp.tool = capture_tool
                register_config_tools(mcp)

                result = registered_tools["haproxy_save_state"]()

        assert "saved" in result.lower()

    def test_save_state_haproxy_error(self, mock_select):
        """Handle HAProxy connection error."""
        def raise_error(*args, **kwargs):
            raise ConnectionRefusedError()

        with patch("socket.socket", side_effect=raise_error):
            from haproxy_mcp.tools.configuration import register_config_tools
            mcp = MagicMock()
            registered_tools = {}

            def capture_tool():
                def decorator(func):
                    registered_tools[func.__name__] = func
                    return func
                return decorator

            mcp.tool = capture_tool
            register_config_tools(mcp)

            result = registered_tools["haproxy_save_state"]()

        assert "Error" in result


class TestHaproxyRestoreState:
    """Tests for haproxy_restore_state tool function."""

    def test_restore_state_success(self, mock_socket_class, mock_select, patch_config_paths, sample_servers_config):
        """Restore state successfully."""
        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(sample_servers_config, f)
        with open(patch_config_paths["map_file"], "w") as f:
            f.write("example.com pool_1\n")
            f.write("api.example.com pool_2\n")

        mock_sock = mock_socket_class(responses={"set server": ""})

        with patch("socket.socket", return_value=mock_sock):
            from haproxy_mcp.tools.configuration import register_config_tools
            mcp = MagicMock()
            registered_tools = {}

            def capture_tool():
                def decorator(func):
                    registered_tools[func.__name__] = func
                    return func
                return decorator

            mcp.tool = capture_tool
            register_config_tools(mcp)

            result = registered_tools["haproxy_restore_state"]()

        assert "restored" in result.lower()
        assert "3 servers" in result

    def test_restore_state_no_servers(self, patch_config_paths):
        """No servers to restore."""
        from haproxy_mcp.tools.configuration import register_config_tools
        mcp = MagicMock()
        registered_tools = {}

        def capture_tool():
            def decorator(func):
                registered_tools[func.__name__] = func
                return func
            return decorator

        mcp.tool = capture_tool
        register_config_tools(mcp)

        result = registered_tools["haproxy_restore_state"]()

        assert "No servers to restore" in result


class TestRestoreServersFromConfigBatchFailure:
    """Tests for restore_servers_from_config batch failure and fallback."""

    def test_restore_servers_batch_failure_fallback(self, mock_socket_class, mock_select, patch_config_paths):
        """Fall back to individual commands when batch fails."""
        # Create config with servers
        config = {
            "example.com": {
                "1": {"ip": "10.0.0.1", "http_port": 80},
                "2": {"ip": "10.0.0.2", "http_port": 80},
            }
        }
        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(config, f)
        with open(patch_config_paths["map_file"], "w") as f:
            f.write("example.com pool_1\n")

        # Track call count to simulate batch failure then individual success
        call_count = [0]

        class BatchFailMockSocket:
            def __init__(self):
                self.sent_commands = []
                self._response_buffer = b""
                self._closed = False

            def connect(self, address):
                pass

            def settimeout(self, timeout):
                pass

            def setblocking(self, blocking):
                pass

            def sendall(self, data):
                command = data.decode().strip()
                self.sent_commands.append(command)
                call_count[0] += 1
                # First batch call fails (contains multiple commands)
                if call_count[0] == 1 and "\n" in data.decode():
                    self._response_buffer = b"error: batch command failed"
                else:
                    self._response_buffer = b""

            def shutdown(self, how):
                pass

            def recv(self, bufsize):
                if self._response_buffer:
                    data = self._response_buffer[:bufsize]
                    self._response_buffer = self._response_buffer[bufsize:]
                    return data
                return b""

            def close(self):
                self._closed = True

            def fileno(self):
                return 999

            def __enter__(self):
                return self

            def __exit__(self, *args):
                self.close()

        mock_sock = BatchFailMockSocket()

        with patch("socket.socket", return_value=mock_sock):
            from haproxy_mcp.tools.configuration import restore_servers_from_config
            from haproxy_mcp.exceptions import HaproxyError

            # Mock batch to raise error
            with patch("haproxy_mcp.tools.configuration.haproxy_cmd_batch") as mock_batch:
                # First call (batch) fails, subsequent calls succeed
                mock_batch.side_effect = [
                    HaproxyError("Batch failed"),  # Initial batch fails
                    None,  # Individual server 1 succeeds
                    None,  # Individual server 2 succeeds
                ]

                result = restore_servers_from_config()

        # Should have restored servers via individual commands
        assert result == 2

    def test_restore_servers_invalid_slot(self, mock_socket_class, mock_select, patch_config_paths):
        """Skip servers with invalid slot number."""
        config = {
            "example.com": {
                "invalid": {"ip": "10.0.0.1", "http_port": 80},  # Invalid slot
                "1": {"ip": "10.0.0.2", "http_port": 80},  # Valid slot
            }
        }
        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(config, f)
        with open(patch_config_paths["map_file"], "w") as f:
            f.write("example.com pool_1\n")

        mock_sock = mock_socket_class(responses={"set server": ""})

        with patch("socket.socket", return_value=mock_sock):
            from haproxy_mcp.tools.configuration import restore_servers_from_config

            result = restore_servers_from_config()

        # Should only restore the valid server
        assert result == 1

    def test_restore_servers_invalid_port(self, mock_socket_class, mock_select, patch_config_paths, caplog):
        """Skip servers with invalid port."""
        import logging
        config = {
            "example.com": {
                "1": {"ip": "10.0.0.1", "http_port": "invalid"},  # Invalid port
                "2": {"ip": "10.0.0.2", "http_port": 80},  # Valid port
            }
        }
        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(config, f)
        with open(patch_config_paths["map_file"], "w") as f:
            f.write("example.com pool_1\n")

        mock_sock = mock_socket_class(responses={"set server": ""})

        with patch("socket.socket", return_value=mock_sock):
            with caplog.at_level(logging.WARNING, logger="haproxy_mcp"):
                from haproxy_mcp.tools.configuration import restore_servers_from_config

                result = restore_servers_from_config()

        # Should only restore the valid server
        assert result == 1


class TestStartupRestoreFailures:
    """Tests for startup_restore failure scenarios."""

    def test_startup_restore_haproxy_timeout(self, mock_select):
        """Skip restore if HAProxy doesn't become ready in time."""
        from haproxy_mcp.exceptions import HaproxyError

        # Mock haproxy_cmd to always fail
        with patch("haproxy_mcp.tools.configuration.haproxy_cmd", side_effect=HaproxyError("Connection refused")):
            with patch("haproxy_mcp.tools.configuration.STARTUP_RETRY_COUNT", 2):
                with patch("time.sleep", return_value=None):
                    from haproxy_mcp.tools.configuration import startup_restore

                    # Should not raise, just log warning
                    startup_restore()

    def test_startup_restore_server_restore_failure(self, mock_socket_class, mock_select, patch_config_paths, response_builder, caplog):
        """Handle server restore failure during startup."""
        import logging
        mock_sock = mock_socket_class(responses={
            "show info": response_builder.info(),
        })

        with patch("socket.socket", return_value=mock_sock):
            with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", side_effect=OSError("Disk error")):
                with patch("haproxy_mcp.tools.certificates.restore_certificates", return_value=0):
                    with caplog.at_level(logging.WARNING, logger="haproxy_mcp"):
                        from haproxy_mcp.tools.configuration import startup_restore

                        startup_restore()

        # Should have logged the failure
        assert any("Failed to restore servers" in record.message for record in caplog.records)

    def test_startup_restore_certificate_failure(self, mock_socket_class, mock_select, patch_config_paths, response_builder, caplog):
        """Handle certificate restore failure during startup."""
        import logging
        mock_sock = mock_socket_class(responses={
            "show info": response_builder.info(),
        })

        with patch("socket.socket", return_value=mock_sock):
            with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", return_value=0):
                with patch("haproxy_mcp.tools.certificates.restore_certificates", side_effect=IOError("Certificate error")):
                    with caplog.at_level(logging.WARNING, logger="haproxy_mcp"):
                        from haproxy_mcp.tools.configuration import startup_restore

                        startup_restore()

        # Should have logged the failure
        assert any("Failed to restore certificates" in record.message for record in caplog.records)


class TestHaproxyReloadFailures:
    """Tests for haproxy_reload failure scenarios."""

    def test_reload_haproxy_not_responding_after_reload(self, mock_subprocess, response_builder):
        """Handle HAProxy not responding after reload."""
        from haproxy_mcp.exceptions import HaproxyError

        mock_subprocess.return_value = MagicMock(returncode=0, stdout="", stderr="")

        # Mock haproxy_cmd to fail after reload
        with patch("haproxy_mcp.haproxy_client.reload_haproxy", return_value=(True, "Reloaded")):
            with patch("haproxy_mcp.tools.configuration.haproxy_cmd", side_effect=HaproxyError("Not responding")):
                with patch("haproxy_mcp.tools.configuration.STARTUP_RETRY_COUNT", 2):
                    with patch("time.sleep", return_value=None):
                        from haproxy_mcp.tools.configuration import register_config_tools
                        mcp = MagicMock()
                        registered_tools = {}

                        def capture_tool():
                            def decorator(func):
                                registered_tools[func.__name__] = func
                                return func
                            return decorator

                        mcp.tool = capture_tool
                        register_config_tools(mcp)

                        result = registered_tools["haproxy_reload"]()

        assert "not responding" in result.lower()

    def test_reload_server_restore_failure(self, mock_subprocess, mock_socket_class, mock_select, response_builder):
        """Handle server restore failure after reload."""
        mock_subprocess.return_value = MagicMock(returncode=0, stdout="", stderr="")

        mock_sock = mock_socket_class(responses={
            "show info": response_builder.info(),
        })

        with patch("socket.socket", return_value=mock_sock):
            with patch("haproxy_mcp.haproxy_client.reload_haproxy", return_value=(True, "Reloaded")):
                with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", side_effect=OSError("Restore failed")):
                    with patch("time.sleep", return_value=None):
                        from haproxy_mcp.tools.configuration import register_config_tools
                        mcp = MagicMock()
                        registered_tools = {}

                        def capture_tool():
                            def decorator(func):
                                registered_tools[func.__name__] = func
                                return func
                            return decorator

                        mcp.tool = capture_tool
                        register_config_tools(mcp)

                        result = registered_tools["haproxy_reload"]()

        assert "reloaded" in result.lower()
        assert "failed" in result.lower()


class TestHaproxySaveStateFailures:
    """Tests for haproxy_save_state failure scenarios."""

    def test_save_state_io_error(self, mock_socket_class, mock_select, patch_config_paths, response_builder):
        """Handle IO error when saving state."""
        mock_sock = mock_socket_class(responses={
            "show servers state": response_builder.servers_state([
                {"be_name": "pool_1", "srv_name": "pool_1_1", "srv_addr": "10.0.0.1", "srv_port": 80},
            ]),
        })

        with patch("haproxy_mcp.tools.configuration.STATE_FILE", patch_config_paths["state_file"]):
            with patch("socket.socket", return_value=mock_sock):
                with patch("haproxy_mcp.tools.configuration.atomic_write_file", side_effect=IOError("Disk full")):
                    from haproxy_mcp.tools.configuration import register_config_tools
                    mcp = MagicMock()
                    registered_tools = {}

                    def capture_tool():
                        def decorator(func):
                            registered_tools[func.__name__] = func
                            return func
                        return decorator

                    mcp.tool = capture_tool
                    register_config_tools(mcp)

                    result = registered_tools["haproxy_save_state"]()

        assert "Error" in result


class TestHaproxyRestoreStateFailures:
    """Tests for haproxy_restore_state failure scenarios."""

    def test_restore_state_haproxy_error(self, mock_socket_class, mock_select, patch_config_paths, sample_servers_config):
        """Handle HAProxy error when restoring state."""
        from haproxy_mcp.exceptions import HaproxyError

        with open(patch_config_paths["servers_file"], "w") as f:
            json.dump(sample_servers_config, f)
        with open(patch_config_paths["map_file"], "w") as f:
            f.write("example.com pool_1\n")
            f.write("api.example.com pool_2\n")

        with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", side_effect=HaproxyError("Connection refused")):
            from haproxy_mcp.tools.configuration import register_config_tools
            mcp = MagicMock()
            registered_tools = {}

            def capture_tool():
                def decorator(func):
                    registered_tools[func.__name__] = func
                    return func
                return decorator

            mcp.tool = capture_tool
            register_config_tools(mcp)

            result = registered_tools["haproxy_restore_state"]()

        assert "Error" in result

    def test_restore_state_os_error(self, patch_config_paths):
        """Handle OS error when restoring state."""
        with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", side_effect=OSError("File not found")):
            from haproxy_mcp.tools.configuration import register_config_tools
            mcp = MagicMock()
            registered_tools = {}

            def capture_tool():
                def decorator(func):
                    registered_tools[func.__name__] = func
                    return func
                return decorator

            mcp.tool = capture_tool
            register_config_tools(mcp)

            result = registered_tools["haproxy_restore_state"]()

        assert "Error" in result

    def test_restore_state_value_error(self, patch_config_paths):
        """Handle ValueError when restoring state."""
        with patch("haproxy_mcp.tools.configuration.restore_servers_from_config", side_effect=ValueError("Invalid config")):
            from haproxy_mcp.tools.configuration import register_config_tools
            mcp = MagicMock()
            registered_tools = {}

            def capture_tool():
                def decorator(func):
                    registered_tools[func.__name__] = func
                    return func
                return decorator

            mcp.tool = capture_tool
            register_config_tools(mcp)

            result = registered_tools["haproxy_restore_state"]()

        assert "Error" in result


class TestHaproxyCheckConfigOSError:
    """Tests for haproxy_check_config OS error handling."""

    def test_check_config_os_error(self, mock_subprocess):
        """Handle OS error during config check."""
        mock_subprocess.side_effect = OSError("Permission denied")

        from haproxy_mcp.tools.configuration import register_config_tools
        mcp = MagicMock()
        registered_tools = {}

        def capture_tool():
            def decorator(func):
                registered_tools[func.__name__] = func
                return func
            return decorator

        mcp.tool = capture_tool
        register_config_tools(mcp)

        result = registered_tools["haproxy_check_config"]()

        assert "Error" in result
        assert "OS error" in result