import { Types } from "mongoose";

import { TariffModel } from "@/models/tariff.model";
import { PrivilegeModel } from "@/models/privilege.model";

import { validateEmptyFields } from "@/utils/validate-empty-fields";
import { validateTariff } from "./helpers";

import type { FastifyReply } from "fastify";

import type { Privilege } from "@/types/models/privilege.type";
import type { Eloquent } from "@/types/models/eloquent.type";
import type { CreateTariffRequest, GetTariffRequest, ReplaceTariffRequest, RemoveTariffRequest } from "./types";

export const getTariffs = async () => TariffModel.find({}).lean();

export const getTariff = async (request: GetTariffRequest, reply: FastifyReply) => {
  const [requestParams, error] = validateEmptyFields(request.params ?? {}, ["id"]);

  if (error) {
    reply.status(400);
    return error;
  }

  if (!Types.ObjectId.isValid(requestParams.id)) {
    reply.status(400);
    return new Error("invalid id");
  }

  const tariff = await TariffModel.findById(requestParams.id).lean();

  if (!tariff) {
    reply.status(404);
    return new Error("tariff not found");
  }

  return tariff;
};

export const createTariff = async (request: CreateTariffRequest, reply: FastifyReply) => {
  const [requestBody, error] = validateTariff(request.body);

  if (error) {
    reply.status(400);
    return error;
  }

  for (const privilege of requestBody.privilegies) {
    if (!Types.ObjectId.isValid(privilege.privilegeId)) {
      reply.status(404);
      return new Error(`privilege id <${privilege.privilegeId}> invalid`);
    }
  }

  const privilegeIDs = requestBody.privilegies.map(({ privilegeId }) => privilegeId);

  const privilegies = await PrivilegeModel.find({ privilegeId: privilegeIDs }).lean();
  const cleanPrivilegies = privilegies.map<Omit<Privilege, keyof Eloquent>>((privilege) => ({
    name: privilege.name,
    privilegeId: privilege.privilegeId,
    serviceKey: privilege.serviceKey,
    description: privilege.description,
    amount: privilege.amount,
    type: privilege.type,
    value: privilege.value,
    price: privilege.price,
  }));

  const newTariff = new TariffModel({
    name: requestBody.name,
    price: requestBody.price,
    isCustom: requestBody.isCustom,
    privilegies: cleanPrivilegies,
  });

  await newTariff.save();

  return newTariff;
};

export const replaceTariff = async (request: ReplaceTariffRequest, reply: FastifyReply) => {
  const [requestBody, error] = validateTariff(request.body ?? {});

  if (error) {
    reply.status(400);
    return error;
  }

  if (!Types.ObjectId.isValid(request.params?.id || "")) {
    reply.status(400);
    return new Error("invalid id");
  }

  const tariff = await TariffModel.findById(request.params?.id);

  if (!tariff) {
    reply.status(404);
    return new Error("tariff not found");
  }

  for (const privilege of requestBody.privilegies) {
    if (!Types.ObjectId.isValid(privilege.privilegeId)) {
      reply.status(404);
      return new Error(`privilege id <${privilege.privilegeId}> invalid`);
    }
  }

  const privilegeIDs = requestBody.privilegies.map(({ privilegeId }) => privilegeId);

  const privilegies = await PrivilegeModel.find({ privilegeId: privilegeIDs }).lean();
  const cleanPrivilegies = privilegies.map<Omit<Privilege, keyof Eloquent>>((privilege) => ({
    name: privilege.name,
    privilegeId: privilege.privilegeId,
    serviceKey: privilege.serviceKey,
    description: privilege.description,
    amount: privilege.amount,
    type: privilege.type,
    value: privilege.value,
    price: privilege.price,
  }));

  await tariff.replaceOne({
    name: requestBody.name,
    price: requestBody.price,
    isCustom: requestBody.isCustom,
    privilegies: cleanPrivilegies,
  });

  return tariff;
};

export const removeTariff = async (request: RemoveTariffRequest, reply: FastifyReply) => {
  const [{ id }, error] = validateEmptyFields(request.body ?? {}, ["id"]);

  if (error) {
    reply.status(400);
    return error;
  }

  if (!Types.ObjectId.isValid(id)) {
    reply.status(400);
    return new Error("invalid id");
  }

  const tariff = await TariffModel.findByIdAndUpdate(id, {
    $set: { isDeleted: true, deletedAt: new Date() },
  }).lean();

  if (!tariff) {
    reply.status(404);
    return new Error("tariff not found");
  }

  return tariff;
};

export const deleteTariff = async (request: RemoveTariffRequest, reply: FastifyReply) => {
  const [{ id }, error] = validateEmptyFields(request.body ?? {}, ["id"]);

  if (error) {
    reply.status(400);
    return error;
  }

  if (!Types.ObjectId.isValid(id)) {
    reply.status(400);
    return new Error("invalid id");
  }

  const tariff = await TariffModel.findByIdAndDelete(id).lean();

  if (!tariff) {
    reply.status(404);
    return new Error("tariff not found");
  }

  return tariff;
};

export const restoreTariff = async (request: RemoveTariffRequest, reply: FastifyReply) => {
  const [{ id }, error] = validateEmptyFields(request.body ?? {}, ["id"]);

  if (error) {
    reply.status(400);
    return error;
  }

  if (!Types.ObjectId.isValid(id)) {
    reply.status(400);
    return new Error("invalid id");
  }

  const tariff = await TariffModel.findByIdAndUpdate(id, { $set: { isDeleted: false } }).lean();

  if (!tariff) {
    reply.status(404);
    return new Error("tariff not found");
  }

  return tariff;
};