package plugins_test

import (
	"context"
	"errors"
	"testing"

	"github.com/jfraeys/fetch_ml/internal/container"
	"github.com/jfraeys/fetch_ml/internal/logging"
	"github.com/jfraeys/fetch_ml/internal/tracking"
	"github.com/jfraeys/fetch_ml/internal/tracking/plugins"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// mockPodmanManager implements container.PodmanInterface for testing
type mockPodmanManager struct {
	startFunc  func(ctx context.Context, cfg *container.ContainerConfig) (string, error)
	stopFunc   func(ctx context.Context, containerID string) error
	removeFunc func(ctx context.Context, containerID string) error
	containers map[string]*container.ContainerConfig
}

func newMockPodmanManager() *mockPodmanManager {
	return &mockPodmanManager{
		containers: make(map[string]*container.ContainerConfig),
	}
}

func (m *mockPodmanManager) StartContainer(ctx context.Context, cfg *container.ContainerConfig) (string, error) {
	if m.startFunc != nil {
		return m.startFunc(ctx, cfg)
	}
	id := "mock-container-" + cfg.Name
	m.containers[id] = cfg
	return id, nil
}

func (m *mockPodmanManager) StopContainer(ctx context.Context, containerID string) error {
	if m.stopFunc != nil {
		return m.stopFunc(ctx, containerID)
	}
	return nil
}

func (m *mockPodmanManager) RemoveContainer(ctx context.Context, containerID string) error {
	if m.removeFunc != nil {
		return m.removeFunc(ctx, containerID)
	}
	delete(m.containers, containerID)
	return nil
}

// TestNewMLflowPluginNilPodman tests creation with nil podman
func TestNewMLflowPluginNilPodman(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
	}

	_, err := plugins.NewMLflowPlugin(logger, nil, opts)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "podman manager is required")
}

// TestNewMLflowPluginEmptyArtifactPath tests creation with empty artifact path
func TestNewMLflowPluginEmptyArtifactPath(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{}

	_, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "artifact base path is required")
}

// TestNewMLflowPluginDefaults tests default values
func TestNewMLflowPluginDefaults(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)
	require.NotNil(t, plugin)
}

// TestMLflowPluginName tests plugin name
func TestMLflowPluginName(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)
	assert.Equal(t, "mlflow", plugin.Name())
}

// TestMLflowPluginProvisionSidecarDisabled tests disabled mode
func TestMLflowPluginProvisionSidecarDisabled(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	config := tracking.ToolConfig{
		Enabled: false,
		Mode:    tracking.ModeDisabled,
	}

	env, err := plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.NoError(t, err)
	assert.Nil(t, env)
}

// TestMLflowPluginProvisionSidecarRemoteNoURI tests remote mode without URI
func TestMLflowPluginProvisionSidecarRemoteNoURI(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	config := tracking.ToolConfig{
		Enabled:  true,
		Mode:     tracking.ModeRemote,
		Settings: map[string]any{},
	}

	_, err = plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "tracking_uri")
}

// TestMLflowPluginProvisionSidecarRemoteWithURI tests remote mode with URI
func TestMLflowPluginProvisionSidecarRemoteWithURI(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath:   "/tmp/mlflow",
		DefaultTrackingURI: "http://default:5000",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	config := tracking.ToolConfig{
		Enabled: true,
		Mode:    tracking.ModeRemote,
		Settings: map[string]any{
			"tracking_uri": "http://custom:5000",
		},
	}

	env, err := plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.NoError(t, err)
	require.NotNil(t, env)
	assert.Equal(t, "http://custom:5000", env["MLFLOW_TRACKING_URI"])
}

// TestMLflowPluginProvisionSidecarRemoteWithDefaultURI tests remote mode with default URI
func TestMLflowPluginProvisionSidecarRemoteWithDefaultURI(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath:   "/tmp/mlflow",
		DefaultTrackingURI: "http://default:5000",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	config := tracking.ToolConfig{
		Enabled:  true,
		Mode:     tracking.ModeRemote,
		Settings: map[string]any{},
	}

	env, err := plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.NoError(t, err)
	require.NotNil(t, env)
	assert.Equal(t, "http://default:5000", env["MLFLOW_TRACKING_URI"])
}

// TestMLflowPluginProvisionSidecarSidecarMode tests sidecar mode (container creation)
func TestMLflowPluginProvisionSidecarSidecarMode(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	allocator := tracking.NewPortAllocator(5500, 5700)
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
		PortAllocator:    allocator,
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	config := tracking.ToolConfig{
		Enabled: true,
		Mode:    tracking.ModeSidecar,
		Settings: map[string]any{
			"job_name": "test-job",
		},
	}

	env, err := plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.NoError(t, err)
	require.NotNil(t, env)
	assert.Contains(t, env, "MLFLOW_TRACKING_URI")
}

// TestMLflowPluginProvisionSidecarStartFailure tests container start failure
func TestMLflowPluginProvisionSidecarStartFailure(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	mockPodman.startFunc = func(ctx context.Context, cfg *container.ContainerConfig) (string, error) {
		return "", errors.New("failed to start container")
	}
	allocator := tracking.NewPortAllocator(5500, 5700)
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
		PortAllocator:    allocator,
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	config := tracking.ToolConfig{
		Enabled: true,
		Mode:    tracking.ModeSidecar,
		Settings: map[string]any{
			"job_name": "test-job",
		},
	}

	_, err = plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.Error(t, err)
	assert.Contains(t, err.Error(), "failed to start")
}

// TestMLflowPluginTeardownNonexistent tests teardown for nonexistent task
func TestMLflowPluginTeardownNonexistent(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	err = plugin.Teardown(context.Background(), "nonexistent-task")
	require.NoError(t, err)
}

// TestMLflowPluginTeardownWithSidecar tests teardown with running sidecar
func TestMLflowPluginTeardownWithSidecar(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	allocator := tracking.NewPortAllocator(5500, 5700)
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
		PortAllocator:    allocator,
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	// Create a sidecar first
	config := tracking.ToolConfig{
		Enabled: true,
		Mode:    tracking.ModeSidecar,
		Settings: map[string]any{
			"job_name": "test-job",
		},
	}

	_, err = plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.NoError(t, err)

	// Now teardown
	err = plugin.Teardown(context.Background(), "task-1")
	require.NoError(t, err)
}

// TestMLflowPluginHealthCheck tests health check
func TestMLflowPluginHealthCheck(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)

	// Health check always returns true for now
	healthy := plugin.HealthCheck(context.Background(), tracking.ToolConfig{})
	assert.True(t, healthy)
}

// TestMLflowPluginCustomImage tests custom image option
func TestMLflowPluginCustomImage(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
		Image:            "custom/mlflow:latest",
		PortAllocator:    tracking.NewPortAllocator(5500, 5700),
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)
	require.NotNil(t, plugin)

	// Provision sidecar and verify custom image is used
	config := tracking.ToolConfig{
		Enabled: true,
		Mode:    tracking.ModeSidecar,
		Settings: map[string]any{
			"job_name": "test-job",
		},
	}

	_, err = plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.NoError(t, err)

	// Verify the custom image was used in container config
	require.NotEmpty(t, mockPodman.containers, "container should have been created")
	for _, cfg := range mockPodman.containers {
		assert.Equal(t, "custom/mlflow:latest", cfg.Image, "custom image should be used")
	}
}

// TestMLflowPluginDefaultImage tests that default image is set
func TestMLflowPluginDefaultImage(t *testing.T) {
	t.Parallel()

	logger := logging.NewLogger(0, false)
	mockPodman := newMockPodmanManager()
	opts := plugins.MLflowOptions{
		ArtifactBasePath: "/tmp/mlflow",
		PortAllocator:    tracking.NewPortAllocator(5500, 5700),
		// Image not specified - should default to ghcr.io/mlflow/mlflow:v2.16.1
	}

	plugin, err := plugins.NewMLflowPlugin(logger, mockPodman, opts)
	require.NoError(t, err)
	require.NotNil(t, plugin)

	// Provision sidecar and verify default image is used
	config := tracking.ToolConfig{
		Enabled: true,
		Mode:    tracking.ModeSidecar,
		Settings: map[string]any{
			"job_name": "test-job",
		},
	}

	_, err = plugin.ProvisionSidecar(context.Background(), "task-1", config)
	require.NoError(t, err)

	// Verify the default image was used in container config
	require.NotEmpty(t, mockPodman.containers, "container should have been created")
	for _, cfg := range mockPodman.containers {
		assert.Equal(t, "ghcr.io/mlflow/mlflow:v2.16.1", cfg.Image, "default image should be used")
	}
}