package main

import (
	"fmt"
	"strings"

	"github.com/spf13/cobra"
	intrgb "netdome.biz/paul/qmk-rgb/internal/rgb"
	"netdome.biz/paul/qmk-rgb/internal/via"
)

var listEffects bool

// resolveEffectTargets turns a name into one target per channel. Whether the
// user named a channel is passed in, because a board with a single channel is
// not an explicit request for it.
func resolveEffectTargets(catalog *intrgb.Catalog, name string, channels []via.Channel) ([]intrgb.EffectTarget, []string, error) {
	return intrgb.ResolveEffect(catalog, name, channels, targetZone != "")
}

func NewEffectCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "effect [name]",
		Short: "Set or list RGB effects",
		Long: "Set the RGB lighting effect on the connected keyboard. Without an argument, lists all effects.\n" +
			"Effect names come from a per-board catalog; a keyboard without one has no names\n" +
			"and is driven with `mode <index>` instead.",
		Args: cobra.MaximumNArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			if listEffects || len(args) == 0 {
				return listAllEffects(cmd)
			}
			return runEffectSet(cmd, args)
		},
	}
	cmd.Flags().BoolVar(&listEffects, "list", false, "List all available effects per zone")
	return cmd
}

func listAllEffects(cmd *cobra.Command) error {
	proto, target, channels, err := openTarget()
	if err != nil {
		return err
	}
	defer proto.Close()

	catalog, _ := intrgb.CatalogFor(target.Device.VendorID, target.Device.ProductID)
	return printEffectList(cmd, catalog, channels, target.Display)
}

func printEffectList(cmd *cobra.Command, catalog *intrgb.Catalog, channels []via.Channel, display map[uint16]string) error {
	type ZoneEffectList struct {
		Zone      string `json:"zone"`
		Channel   uint8  `json:"channel"`
		Subsystem string `json:"subsystem"`
		Effect    string `json:"effect"`
		ID        uint8  `json:"id"`
	}
	type EffectList struct {
		Catalog string           `json:"catalog"`
		Zones   []ZoneEffectList `json:"zones"`
	}

	list := EffectList{Catalog: catalog.Name(), Zones: []ZoneEffectList{}}
	for _, ch := range channels {
		for id, name := range catalog.Names(ch) {
			list.Zones = append(list.Zones, ZoneEffectList{
				Zone:      channelName(ch, display),
				Channel:   uint8(ch),
				Subsystem: ch.Subsystem(),
				Effect:    name,
				ID:        uint8(id),
			})
		}
	}

	return encodeJSON(cmd.OutOrStdout(), list)
}

func runEffectSet(cmd *cobra.Command, args []string) error {
	proto, target, channels, err := openTarget()
	if err != nil {
		return err
	}
	defer proto.Close()

	catalog, _ := intrgb.CatalogFor(target.Device.VendorID, target.Device.ProductID)
	targets, skipped, err := resolveEffectTargets(catalog, args[0], channels)
	if err != nil {
		return err
	}
	if len(skipped) > 0 {
		fmt.Fprintf(cmd.ErrOrStderr(), "Warning: effect not supported on channel(s): %s\n", strings.Join(skipped, ", "))
	}

	results, err := setEffectVerified(proto, targets, target.Display, catalog)
	if err != nil {
		return err
	}

	// Claiming the requested effect when the keyboard kept another one is the
	// contradiction this read-back exists to prevent: on the logo and side
	// channels an effect of ID 0 leaves the previous effect running.
	if anyEffectMismatch(results) {
		fmt.Fprintln(cmd.OutOrStdout(), formatEffectResults(args[0], results))
		return nil
	}

	fmt.Fprintf(cmd.OutOrStdout(), "Effect set to %q\n", args[0])
	return nil
}