/* global defineEventHandler, createError, readBody, setResponseStatus */

import { createValidationError, handleRecursedValidationError } from "../utils/validation";
import { database as db } from "../utils/database";
import getRequestingUser from "../utils/getRequestingUser";
import { getOrder } from "./orders/[id].get";
import Snowflake from "~/utils/snowflake";

type importedProduct = {
  name: string | null,
  link: string,
  price_imported: number,
  price: number,
}

type work = {
  offer: string,
  price: number,
  notes: string | null,
  is_fulfilled: boolean | 0 | 1,
}

type order = {
  client: string,
  // user: string,
  is_draft: boolean | 0 | 1,
  imported_products: Array<importedProduct>,
  work: Array<work>,
};

export function checkIsWork<Patch extends boolean = boolean>(
  value: any,
  patch: Patch,
): value is Patch extends true ? Partial<work> : work {
  const errors = new Map<string, string>();

  if (typeof value !== "object") {
    throw createError({
      message: "Invalid body",
      statusCode: 400,
    });
  }

  if (!(typeof value.offer === "string" || (patch && value.offer === undefined))) errors.set("offer", "is not string");
  if (!(typeof value.price === "number" || (patch && value.price === undefined))) errors.set("price", "is not price");
  if (!(typeof value.notes === "string" || value.notes === null || (patch && value.notes === undefined))) errors.set("notes", "is not string or null");
  if (!(typeof value.is_fulfilled === "boolean" || value.is_fulfilled === 0 || value.is_fulfilled === 1 || (patch && value.is_fulfilled === undefined))) errors.set("is_fulfilled", "is not boolean");

  if (errors.size !== 0) throw createValidationError(errors);
  return true;
}

export function checkIsImportedProduct<Patch extends boolean = boolean>(
  value: any,
  patch: Patch,
): value is Patch extends true ? Partial<importedProduct> : importedProduct {
  const errors = new Map<string, string>();

  if (typeof value !== "object") {
    throw createError({
      message: "Invalid body",
      statusCode: 400,
    });
  }

  if (!(typeof value.name === "string" || value.name === null || (patch && value.name === undefined))) errors.set("name", "is not string or null");
  if (!(typeof value.link === "string" || (patch && value.name === undefined))) errors.set("link", "is not string");
  if (!(typeof value.price_imported === "number" || (patch && value.name === undefined))) errors.set("price_imported", "is not number");
  if (!(typeof value.price || (patch && value.price === undefined))) errors.set("price", "is not number");

  if (errors.size !== 0) throw createValidationError(errors);

  return true;
}

export function checkIsOrder<Patch extends boolean = boolean>(
  value: any,
  patch: Patch,
): value is Patch extends true ? Partial<Pick<order, "client" | "is_draft">> : order {
  const errors = new Map<string, string>();

  if (typeof value !== "object") {
    throw createError({
      message: "Invalid body",
      statusCode: 400,
    });
  }

  if (!(typeof value.client === "string" || (patch && value.client === undefined))) errors.set("client", "is not string");
  if (!(typeof value.is_draft === "boolean" || value.is_draft === 0 || value.is_draft === 1 || (patch && value.is_draft === undefined))) errors.set("is_draft", "is not boolean");
  if (!(value.imported_products instanceof Array)) errors.set("imported_products", "is not array");
  else if (patch && value.imported_products !== undefined) errors.set("imported_products", "cannot patch from order");
  if (!(value.work instanceof Array)) errors.set("work", "is not array");
  else if (patch && value.work !== undefined) errors.set("work", "cannot patch from order");

  if (!patch) {
    const importedProducts = value.imported_products;
    if (importedProducts instanceof Array) {
      for (const i in importedProducts) {
        try {
          checkIsImportedProduct(importedProducts[i], patch);
        } catch (e) {
          handleRecursedValidationError(e, errors, `imported_products[${i}]`);
        }
      }
    }

    const work = value.work;
    if (work instanceof Array) {
      for (const i in work) {
        try {
          checkIsWork(work[i], patch);
        } catch (e) {
          handleRecursedValidationError(e, errors, `work[${i}]`);
        }
      }
    }
  }

  if (errors.size !== 0) throw createValidationError(errors);

  return true;
}

export default defineEventHandler(async (e) => {
  const body = await readBody(e);
  const id = new Snowflake().toString();
  const user = await getRequestingUser(e);

  if (!checkIsOrder(body, false)) throw createError({ message: "Invalid body", statusCode: 400 });

  const database = await db.new();
  await database.beginTransaction();

  await database.query(
    ["INSERT INTO",
      "`orders`",
      "VALUES",
      "(?, ?, ?, ?)",
    ].join(" "),
    [id, body.client, user.id, body.is_draft],
  );

  const promises: Array<Promise<any>> = [];
  for (const i of body.imported_products) {
    promises.push(database.query(
      ["INSERT INTO",
        "`imported_products`",
        "VALUES",
        "(?, ?, ?, ?, ?, ?)",
      ].join(" "),
      [new Snowflake().toString(), id, i.name, i.link, i.price_imported, i.price],
    ));
  }

  for (const i of body.work) {
    promises.push(database.query(
      ["INSERT INTO",
        "`work`",
        "VALUES",
        "(?, ?, ?, ?, ?, ?)",
      ].join(" "),
      [new Snowflake().toString(), id, i.offer, i.price, i.notes, i.is_fulfilled],
    ));
  }

  await Promise.all(promises);
  await database.commit();

  setResponseStatus(e, 201);
  return getOrder(id);
});