package commands

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/spf13/cobra"
)

var startAgentCmd = &cobra.Command{
	Use:   "start-agent [agent-name]",
	Short: "Start an agent to process tasks",
	Long: `Start a specific agent to continuously process assigned tasks.

The agent will:
1. Check for assigned tasks every 30 seconds
2. Process tasks using the configured LLM
3. Create GitHub PRs for solutions
4. Mark tasks as completed

Examples:
  staff start-agent backend-engineer
  staff start-agent frontend-engineer`,
	Args: cobra.ExactArgs(1),
	RunE: runStartAgent,
}

var (
	agentInterval time.Duration = 30 * time.Second
)

func init() {
	startAgentCmd.Flags().DurationVar(&agentInterval, "interval", 30*time.Second, "Task check interval")
}

func runStartAgent(cmd *cobra.Command, args []string) error {
	agentName := args[0]

	// Check if agent exists in configuration
	var agentExists bool
	for _, agent := range cfg.Agents {
		if agent.Name == agentName {
			agentExists = true
			break
		}
	}

	if !agentExists {
		return fmt.Errorf("agent '%s' not found in configuration", agentName)
	}

	fmt.Printf("Starting agent: %s\n", agentName)
	fmt.Printf("Task check interval: %v\n", agentInterval)
	fmt.Printf("Press Ctrl+C to stop the agent\n\n")

	// Set up signal handling for graceful shutdown
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

	go func() {
		<-sigChan
		fmt.Printf("\nReceived shutdown signal, stopping agent...\n")
		cancel()
	}()

	// Start the agent
	err := agentManager.StartAgent(agentName, agentInterval)
	if err != nil {
		return fmt.Errorf("failed to start agent: %w", err)
	}

	// Wait for context cancellation (Ctrl+C)
	<-ctx.Done()

	fmt.Printf("Agent %s stopped\n", agentName)
	return nil
}