add quick answers

backend/src/services/QuickAnswerService/CreateQuickAnswerService.ts

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+import AppError from "../../errors/AppError";
+import QuickAnswer from "../../models/QuickAnswer";
+
+interface Request {
+  shortcut: string;
+  message: string;
+}
+
+const CreateQuickAnswerService = async ({
+  shortcut,
+  message
+}: Request): Promise<QuickAnswer> => {
+  const nameExists = await QuickAnswer.findOne({
+    where: { shortcut }
+  });
+
+  if (nameExists) {
+    throw new AppError("ERR__SHORTCUT_DUPLICATED");
+  }
+
+  const quickAnswer = await QuickAnswer.create({ shortcut, message });
+
+  return quickAnswer;
+};
+
+export default CreateQuickAnswerService;

backend/src/services/QuickAnswerService/DeleteQuickAnswerService.ts

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+import QuickAnswer from "../../models/QuickAnswer";
+import AppError from "../../errors/AppError";
+
+const DeleteQuickAnswerService = async (id: string): Promise<void> => {
+  const quickAnswer = await QuickAnswer.findOne({
+    where: { id }
+  });
+
+  if (!quickAnswer) {
+    throw new AppError("ERR_NO_QUICK_ANSWER_FOUND", 404);
+  }
+
+  await quickAnswer.destroy();
+};
+
+export default DeleteQuickAnswerService;

backend/src/services/QuickAnswerService/ListQuickAnswerService.ts

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+import { Sequelize } from "sequelize";
+import QuickAnswer from "../../models/QuickAnswer";
+
+interface Request {
+  searchParam?: string;
+  pageNumber?: string;
+}
+
+interface Response {
+  quickAnswers: QuickAnswer[];
+  count: number;
+  hasMore: boolean;
+}
+
+const ListQuickAnswerService = async ({
+  searchParam = "",
+  pageNumber = "1"
+}: Request): Promise<Response> => {
+  const whereCondition = {
+    message: Sequelize.where(
+      Sequelize.fn("LOWER", Sequelize.col("message")),
+      "LIKE",
+      `%${searchParam.toLowerCase().trim()}%`
+    )
+  };
+  const limit = 20;
+  const offset = limit * (+pageNumber - 1);
+
+  const { count, rows: quickAnswers } = await QuickAnswer.findAndCountAll({
+    where: whereCondition,
+    limit,
+    offset,
+    order: [["message", "ASC"]]
+  });
+
+  const hasMore = count > offset + quickAnswers.length;
+
+  return {
+    quickAnswers,
+    count,
+    hasMore
+  };
+};
+
+export default ListQuickAnswerService;

backend/src/services/QuickAnswerService/ShowQuickAnswerService.ts

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+import QuickAnswer from "../../models/QuickAnswer";
+import AppError from "../../errors/AppError";
+
+const ShowQuickAnswerService = async (id: string): Promise<QuickAnswer> => {
+  const quickAnswer = await QuickAnswer.findByPk(id);
+
+  if (!quickAnswer) {
+    throw new AppError("ERR_NO_QUICK_ANSWERS_FOUND", 404);
+  }
+
+  return quickAnswer;
+};
+
+export default ShowQuickAnswerService;

backend/src/services/QuickAnswerService/UpdateQuickAnswerService.ts

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+import QuickAnswer from "../../models/QuickAnswer";
+import AppError from "../../errors/AppError";
+
+interface QuickAnswerData {
+  shortcut?: string;
+  message?: string;
+}
+
+interface Request {
+  quickAnswerData: QuickAnswerData;
+  quickAnswerId: string;
+}
+
+const UpdateQuickAnswerService = async ({
+  quickAnswerData,
+  quickAnswerId
+}: Request): Promise<QuickAnswer> => {
+  const { shortcut, message } = quickAnswerData;
+
+  const quickAnswer = await QuickAnswer.findOne({
+    where: { id: quickAnswerId },
+    attributes: ["id", "shortcut", "message"]
+  });
+
+  if (!quickAnswer) {
+    throw new AppError("ERR_NO_QUICK_ANSWERS_FOUND", 404);
+  }
+  await quickAnswer.update({
+    shortcut,
+    message
+  });
+
+  await quickAnswer.reload({
+    attributes: ["id", "shortcut", "message"]
+  });
+
+  return quickAnswer;
+};
+
+export default UpdateQuickAnswerService;