package flag

import (
	"encoding/json"
	"fmt"

	proxyFlag "forge.cadoles.com/cadoles/bouncer/internal/command/admin/proxy/flag"
	"forge.cadoles.com/cadoles/bouncer/internal/setup"
	"forge.cadoles.com/cadoles/bouncer/internal/store"
	"github.com/pkg/errors"
	"github.com/urfave/cli/v2"
)

const (
	FlagKeyLayerType = "layer-type"
)

func WithLayerFlags(flags ...cli.Flag) []cli.Flag {
	baseFlags := proxyFlag.WithProxyFlags(
		LayerName(),
	)

	flags = append(flags, baseFlags...)

	return flags
}

func WithLayerCreateFlags(flags ...cli.Flag) []cli.Flag {
	return WithLayerFlags(
		LayerType(),
		LayerOptions(),
	)
}

const KeyLayerName = "layer-name"

func LayerName() cli.Flag {
	return &cli.StringFlag{
		Name:     KeyLayerName,
		Usage:    "use `LAYER_NAME` as targeted layer",
		Value:    "",
		Required: true,
	}
}

const KeyLayerType = "layer-type"

func LayerType() cli.Flag {
	return &cli.StringFlag{
		Name:     KeyLayerType,
		Usage:    fmt.Sprintf("Set `LAYER_TYPE` as layer's type (available: %v)", setup.GetLayerTypes()),
		Value:    "",
		Required: true,
	}
}

const KeyLayerOptions = "layer-options"

func LayerOptions() cli.Flag {
	return &cli.StringFlag{
		Name:  KeyLayerOptions,
		Usage: "Set `LAYER_OPTIONS` as layer's options",
		Value: "{}",
	}
}

const KeyLayerWeight = "layer-weight"

func LayerWeight() cli.Flag {
	return &cli.IntFlag{
		Name:  KeyLayerWeight,
		Usage: "Set `LAYER_WEIGHT` as layer's weight",
	}
}

const KeyLayerEnabled = "layer-enabled"

func LayerEnabled() cli.Flag {
	return &cli.BoolFlag{
		Name:  KeyLayerEnabled,
		Usage: "Enable or disable layer",
	}
}

func AssertLayerName(ctx *cli.Context) (store.LayerName, error) {
	rawLayerName := ctx.String(KeyLayerName)

	name, err := store.ValidateName(rawLayerName)
	if err != nil {
		return "", errors.WithStack(err)
	}

	return store.LayerName(name), nil
}

func AssertLayerType(ctx *cli.Context) (store.LayerType, error) {
	rawLayerType := ctx.String(FlagKeyLayerType)

	layerType := store.LayerType(rawLayerType)
	if !setup.LayerTypeExists(layerType) {
		return "", errors.Errorf("unknown layer type '%s'", layerType)
	}

	return layerType, nil
}

func AssertLayerOptions(ctx *cli.Context) (store.LayerOptions, error) {
	rawLayerOptions := ctx.String(KeyLayerOptions)

	layerOptions := store.LayerOptions{}

	if err := json.Unmarshal([]byte(rawLayerOptions), &layerOptions); err != nil {
		return nil, errors.WithStack(err)
	}

	return layerOptions, nil
}