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import type { WaConversation, WaMessage } from "../../db/schema";
import type { WaConversationFilters } from "../../dal/whatsapp/conversations.dal";
import type { WhatsAppInboundMessage, WhatsAppClient } from "../../lib/whatsapp";
import { NotFoundError, ValidationError } from "../../lib/errors";
const TWENTY_FOUR_HOURS_MS = 24 * 60 * 60 * 1000;
const MAX_TEXT_MESSAGE_LENGTH = 4096;
export class ConversationService {
constructor(private dal: Dal) {}
/**
* Find or create a conversation for a phone number.
* Auto-maps contact type by checking pros and inquiries.
*/
async getOrCreateConversation(
phoneNumber: string,
contactName?: string,
): Promise<WaConversation> {
const existing =
await this.dal.waConversations.findByPhoneNumber(phoneNumber);
if (existing) return existing;
// Auto-map contact type by exact matching
let contactType: "pro" | "customer" | "unknown" = "unknown";
let proId: string | null = null;
const inquiryId: number | null = null;
// Check if this phone belongs to a pro (exact match on whatsapp field)
const pro =
await this.dal.pros.findByWhatsappNumber(phoneNumber);
if (pro) {
contactType = "pro";
proId = pro.id;
} else {
// Check if this phone belongs to a customer (from inquiries)
const isCustomer =
await this.dal.inquiries.existsByPhone(phoneNumber);
if (isCustomer) {
contactType = "customer";
}
}
return this.dal.waConversations.create({
phoneNumber,
contactName: contactName ?? null,
contactType,
proId,
inquiryId,
});
}
/**
* Store an inbound message from webhook. Creates conversation if needed.
* Deduplicates by wamid.
*/
async addInboundMessage(
message: WhatsAppInboundMessage,
contactName: string,
): Promise<WaMessage> {
// Dedup check
const existing = await this.dal.waMessages.findByWamid(message.id);
if (existing) return existing;
const conversation = await this.getOrCreateConversation(
message.from,
contactName,
);
const content = this.extractContent(message);
const now = new Date();
const stored = await this.dal.waMessages.create({
conversationId: conversation.id,
wamid: message.id,
direction: "inbound",
type: message.type as WaMessage["type"],
content: JSON.stringify(content),
status: "delivered",
});
// Update conversation metadata
await this.dal.waConversations.update(conversation.id, {
lastMessageAt: now,
lastCustomerMessageAt: now,
contactName: contactName || conversation.contactName,
});
await this.dal.waConversations.incrementUnread(conversation.id);
return stored;
}
/**
* Store an outbound message record.
*/
async addOutboundMessage(
conversationId: number,
type: string,
content: string,
options?: {
templateName?: string;
sentBy?: string;
campaignId?: number;
wamid?: string;
status?: string;
},
): Promise<WaMessage> {
return this.dal.waMessages.create({
conversationId,
wamid: options?.wamid ?? null,
direction: "outbound",
type: type as WaMessage["type"],
content,
templateName: options?.templateName ?? null,
sentBy: options?.sentBy ?? null,
campaignId: options?.campaignId ?? null,
status: (options?.status ?? "queued") as WaMessage["status"],
});
}
/**
* Update a message's delivery status by wamid.
*/
async updateMessageStatus(
wamid: string,
status: string,
errorCode?: string,
): Promise<void> {
await this.dal.waMessages.updateStatus(wamid, status, errorCode);
}
/**
* Reply to a conversation with free-form text (within 24hr window)
* or template (any time).
*/
async reply(
conversationId: number,
text: string,
adminUserId: string,
whatsAppClient: WhatsAppClient,
): Promise<WaMessage> {
const conversation =
await this.dal.waConversations.findById(conversationId);
if (!conversation) {
throw new NotFoundError("Conversation", String(conversationId));
}
if (!this.isWindowOpen(conversation)) {
throw new Error(
"24-hour messaging window has expired. Use a template message instead.",
);
}
if (text.length > MAX_TEXT_MESSAGE_LENGTH) {
throw new ValidationError(
`Message too long (${text.length} chars). Maximum is ${MAX_TEXT_MESSAGE_LENGTH} characters.`,
);
}
const result = await whatsAppClient.sendText(
conversation.phoneNumber,
text,
);
const wamid = result.messages[0]?.id;
const stored = await this.addOutboundMessage(
conversationId,
"text",
JSON.stringify({ body: text }),
{ sentBy: adminUserId, wamid, status: "sent" },
);
await this.dal.waConversations.update(conversationId, {
lastMessageAt: new Date(),
});
return stored;
}
/**
* Reply with a template message (works outside 24hr window).
*/
async replyWithTemplate(
conversationId: number,
templateName: string,
language: string,
components: unknown[] | undefined,
adminUserId: string,
whatsAppClient: WhatsAppClient,
): Promise<WaMessage> {
const conversation =
await this.dal.waConversations.findById(conversationId);
if (!conversation) {
throw new NotFoundError("Conversation", String(conversationId));
}
const result = await whatsAppClient.sendTemplate(
conversation.phoneNumber,
templateName,
language,
components as Parameters<typeof whatsAppClient.sendTemplate>[3],
);
const wamid = result.messages[0]?.id;
const stored = await this.addOutboundMessage(
conversationId,
"template",
JSON.stringify({ templateName, language, components }),
{ templateName, sentBy: adminUserId, wamid, status: "sent" },
);
await this.dal.waConversations.update(conversationId, {
lastMessageAt: new Date(),
});
return stored;
}
async listConversations(
filters: WaConversationFilters,
offset: number,
limit: number,
) {
const [conversations, total] = await Promise.all([
this.dal.waConversations.findAll(filters, offset, limit),
this.dal.waConversations.count(filters),
]);
return { conversations, total };
}
async getConversation(id: number, offset = 0, limit = 100) {
const conversation = await this.dal.waConversations.findById(id);
if (!conversation) {
throw new NotFoundError("Conversation", String(id));
}
const messages = await this.dal.waMessages.findByConversationId(
id,
offset,
limit,
);
return { conversation, messages };
}
/**
* Check if the 24-hour customer messaging window is open.
* The window is open if the customer sent a message in the last 24 hours.
*/
isWindowOpen(conversation: WaConversation): boolean {
if (!conversation.lastCustomerMessageAt) return false;
const lastCustomerMsg =
conversation.lastCustomerMessageAt instanceof Date
? conversation.lastCustomerMessageAt.getTime()
: Number(conversation.lastCustomerMessageAt) * 1000;
return Date.now() - lastCustomerMsg < TWENTY_FOUR_HOURS_MS;
}
private extractContent(
message: WhatsAppInboundMessage,
): Record<string, unknown> {
switch (message.type) {
case "text":
return { body: message.text?.body ?? "" };
case "image":
return {
mediaId: message.image?.id,
caption: message.image?.caption,
};
case "video":
return {
mediaId: message.video?.id,
caption: message.video?.caption,
};
case "document":
return {
mediaId: message.document?.id,
filename: message.document?.filename,
caption: message.document?.caption,
};
case "audio":
return { mediaId: message.audio?.id };
case "interactive":
return {
type: message.interactive?.type,
buttonReply: message.interactive?.button_reply,
listReply: message.interactive?.list_reply,
};
case "location":
return {
latitude: message.location?.latitude,
longitude: message.location?.longitude,
name: message.location?.name,
address: message.location?.address,
};
default:
return { raw: message };
}
}
}
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