// Package plugins provides framework-specific extensions to the worker.
// This implements the prolog/epilog model where plugins hook into task lifecycle events.
package plugins

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/jfraeys/fetch_ml/internal/jupyter"
	"github.com/jfraeys/fetch_ml/internal/queue"
)

// JupyterManager interface for jupyter service management
type JupyterManager interface {
	StartService(ctx context.Context, req *jupyter.StartRequest) (*jupyter.JupyterService, error)
	StopService(ctx context.Context, serviceID string) error
	RemoveService(ctx context.Context, serviceID string, purge bool) error
	RestoreWorkspace(ctx context.Context, name string) (string, error)
	ListServices() []*jupyter.JupyterService
	ListInstalledPackages(ctx context.Context, serviceName string) ([]jupyter.InstalledPackage, error)
}

// TaskRunner executes framework-specific tasks
// This is the minimal interface needed by plugins to execute tasks
type TaskRunner interface {
	GetJupyterManager() JupyterManager
}

// RunJupyterTask runs a Jupyter-related task.
// It handles start, stop, remove, restore, and list_packages actions.
// This is a plugin function that extends the core worker with Jupyter support.
func RunJupyterTask(ctx context.Context, runner TaskRunner, task *queue.Task) ([]byte, error) {
	jm := runner.GetJupyterManager()
	if jm == nil {
		return nil, fmt.Errorf("jupyter manager not configured")
	}

	action := task.Metadata["jupyter_action"]
	if action == "" {
		action = "start" // Default action
	}

	switch action {
	case "start":
		name := task.Metadata["jupyter_name"]
		if name == "" {
			name = task.Metadata["jupyter_workspace"]
		}
		if name == "" {
			// Extract from jobName if format is "jupyter-<name>"
			if len(task.JobName) > 8 && task.JobName[:8] == "jupyter-" {
				name = task.JobName[8:]
			}
		}
		if name == "" {
			return nil, fmt.Errorf("missing jupyter_name or jupyter_workspace in task metadata")
		}

		req := &jupyter.StartRequest{Name: name}
		service, err := jm.StartService(ctx, req)
		if err != nil {
			return nil, fmt.Errorf("failed to start jupyter service: %w", err)
		}

		output := map[string]any{
			"type":    "start",
			"service": service,
		}
		return json.Marshal(output)

	case "stop":
		serviceID := task.Metadata["jupyter_service_id"]
		if serviceID == "" {
			return nil, fmt.Errorf("missing jupyter_service_id in task metadata")
		}
		if err := jm.StopService(ctx, serviceID); err != nil {
			return nil, fmt.Errorf("failed to stop jupyter service: %w", err)
		}
		return json.Marshal(map[string]string{"type": "stop", "status": "stopped"})

	case "remove":
		serviceID := task.Metadata["jupyter_service_id"]
		if serviceID == "" {
			return nil, fmt.Errorf("missing jupyter_service_id in task metadata")
		}
		purge := task.Metadata["jupyter_purge"] == "true"
		if err := jm.RemoveService(ctx, serviceID, purge); err != nil {
			return nil, fmt.Errorf("failed to remove jupyter service: %w", err)
		}
		return json.Marshal(map[string]string{"type": "remove", "status": "removed"})

	case "restore":
		name := task.Metadata["jupyter_name"]
		if name == "" {
			name = task.Metadata["jupyter_workspace"]
		}
		if name == "" {
			return nil, fmt.Errorf("missing jupyter_name or jupyter_workspace in task metadata")
		}
		serviceID, err := jm.RestoreWorkspace(ctx, name)
		if err != nil {
			return nil, fmt.Errorf("failed to restore jupyter workspace: %w", err)
		}
		return json.Marshal(map[string]string{"type": "restore", "service_id": serviceID})

	case "list_packages":
		serviceName := task.Metadata["jupyter_name"]
		if serviceName == "" {
			// Extract from jobName if format is "jupyter-packages-<name>"
			if len(task.JobName) > 16 && task.JobName[:16] == "jupyter-packages-" {
				serviceName = task.JobName[16:]
			}
		}
		if serviceName == "" {
			return nil, fmt.Errorf("missing jupyter_name in task metadata")
		}

		packages, err := jm.ListInstalledPackages(ctx, serviceName)
		if err != nil {
			return nil, fmt.Errorf("failed to list installed packages: %w", err)
		}

		output := map[string]any{
			"type":     "list_packages",
			"packages": packages,
		}
		return json.Marshal(output)

	default:
		return nil, fmt.Errorf("unknown jupyter action: %s", action)
	}
}