package bus

import "strings"

// NormalizeInboundMessage ensures the inbound context is normalized and keeps
// convenience mirrors in sync for runtime consumers.
func NormalizeInboundMessage(msg InboundMessage) InboundMessage {
	msg.Context = normalizeInboundContext(msg.Context)
	msg.Channel = msg.Context.Channel
	msg.SenderID = msg.Context.SenderID
	msg.ChatID = msg.Context.ChatID
	if msg.MessageID == "" {
		msg.MessageID = msg.Context.MessageID
	}
	if msg.Context.MessageID == "" {
		msg.Context.MessageID = msg.MessageID
	}
	return msg
}

func (ctx InboundContext) isZero() bool {
	return ctx.Channel == "" &&
		ctx.Account == "" &&
		ctx.ChatID == "" &&
		ctx.ChatType == "" &&
		ctx.TopicID == "" &&
		ctx.SpaceID == "" &&
		ctx.SpaceType == "" &&
		ctx.SenderID == "" &&
		ctx.MessageID == "" &&
		!ctx.Mentioned &&
		ctx.ReplyToMessageID == "" &&
		ctx.ReplyToSenderID == "" &&
		len(ctx.ReplyHandles) == 0 &&
		len(ctx.Raw) == 0
}

func normalizeInboundContext(ctx InboundContext) InboundContext {
	ctx.Channel = strings.TrimSpace(ctx.Channel)
	ctx.Account = strings.TrimSpace(ctx.Account)
	ctx.ChatID = strings.TrimSpace(ctx.ChatID)
	ctx.ChatType = normalizeKind(ctx.ChatType)
	ctx.TopicID = strings.TrimSpace(ctx.TopicID)
	ctx.SpaceID = strings.TrimSpace(ctx.SpaceID)
	ctx.SpaceType = normalizeKind(ctx.SpaceType)
	ctx.SenderID = strings.TrimSpace(ctx.SenderID)
	ctx.MessageID = strings.TrimSpace(ctx.MessageID)
	ctx.ReplyToMessageID = strings.TrimSpace(ctx.ReplyToMessageID)
	ctx.ReplyToSenderID = strings.TrimSpace(ctx.ReplyToSenderID)
	ctx.ReplyHandles = cloneStringMap(ctx.ReplyHandles)
	ctx.Raw = cloneStringMap(ctx.Raw)
	return ctx
}

func cloneStringMap(src map[string]string) map[string]string {
	if len(src) == 0 {
		return nil
	}

	dst := make(map[string]string, len(src))
	for k, v := range src {
		dst[k] = v
	}
	return dst
}

func normalizeKind(kind string) string {
	switch strings.ToLower(strings.TrimSpace(kind)) {
	case "direct", "group", "channel", "guild", "team", "workspace", "tenant", "topic":
		return strings.ToLower(strings.TrimSpace(kind))
	default:
		return strings.ToLower(strings.TrimSpace(kind))
	}
}