package cli

import (
	"fmt"
	"sort"
	"text/tabwriter"

	"github.com/spf13/cobra"

	"galahad2lcd/internal/device"
)

func newListCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "list",
		Short: "List USB devices visible to the driver",
		Args:  cobra.NoArgs,
		RunE: func(cmd *cobra.Command, _ []string) error {
			ctx, stop := newSignalContext()
			defer stop()

			infos, err := device.ListDevices(ctx)
			if err != nil {
				return err
			}

			if len(infos) == 0 {
				fmt.Fprintln(cmd.OutOrStdout(), "no USB devices found (are permissions configured?)")
				return nil
			}

			sort.Slice(infos, func(i, j int) bool {
				return infos[i].Bus < infos[j].Bus ||
					(infos[i].Bus == infos[j].Bus && infos[i].Address < infos[j].Address)
			})

			w := tabwriter.NewWriter(cmd.OutOrStdout(), 0, 4, 2, ' ', 0)
			fmt.Fprintln(w, "BUS\tADDR\tVID:PID\tPRODUCT\t")
			for _, info := range infos {
				product := info.Product
				if product == "" {
					product = "-"
				}
				marker := " "
				if info.IsLCD {
					marker = "*"
				}
				fmt.Fprintf(w, "%s%d\t%d\t%04x:%04x\t%s\t\n",
					marker, info.Bus, info.Address, info.VendorID, info.ProductID, product)
			}
			fmt.Fprintln(w, "* Lian Li Galahad II LCD (0416:7395)")
			return w.Flush()
		},
	}
}