package whisper

import (
	"fmt"

	"github.com/go-irc/irc"
	"github.com/pkg/errors"

	"github.com/Luzifer/twitch-bot/plugins"
)

const actorName = "whisper"

var formatMessage plugins.MsgFormatter

func Register(args plugins.RegistrationArguments) error {
	formatMessage = args.FormatMessage

	args.RegisterActor(actorName, func() plugins.Actor { return &actor{} })

	args.RegisterActorDocumentation(plugins.ActionDocumentation{
		Description: "Send a whisper (requires a verified bot!)",
		Name:        "Send Whisper",
		Type:        "whisper",

		Fields: []plugins.ActionDocumentationField{
			{
				Default:         "",
				Description:     "Message to whisper to the user",
				Key:             "message",
				Name:            "Message",
				Optional:        false,
				SupportTemplate: true,
				Type:            plugins.ActionDocumentationFieldTypeString,
			},
			{
				Default:         "",
				Description:     "User to send the message to",
				Key:             "to",
				Name:            "To User",
				Optional:        false,
				SupportTemplate: true,
				Type:            plugins.ActionDocumentationFieldTypeString,
			},
		},
	})

	return nil
}

type actor struct{}

func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData *plugins.FieldCollection, attrs *plugins.FieldCollection) (preventCooldown bool, err error) {
	to, err := formatMessage(attrs.MustString("to", nil), m, r, eventData)
	if err != nil {
		return false, errors.Wrap(err, "preparing whisper receiver")
	}

	msg, err := formatMessage(attrs.MustString("message", nil), m, r, eventData)
	if err != nil {
		return false, errors.Wrap(err, "preparing whisper message")
	}

	channel := "#tmijs" // As a fallback, copied from tmi.js

	return false, errors.Wrap(
		c.WriteMessage(&irc.Message{
			Command: "PRIVMSG",
			Params: []string{
				channel,
				fmt.Sprintf("/w %s %s", to, msg),
			},
		}),
		"sending whisper",
	)
}

func (a actor) IsAsync() bool { return false }
func (a actor) Name() string  { return actorName }

func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
	if v, err := attrs.String("to"); err != nil || v == "" {
		return errors.New("to must be non-empty string")
	}

	if v, err := attrs.String("message"); err != nil || v == "" {
		return errors.New("message must be non-empty string")
	}

	return nil
}