import { defineEventHandler, readBody, setResponseStatus } from "h3";
import * as Prisma from "@prisma/client";

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

import { createError } from "#imports";

type importedProduct<inOrder extends boolean = boolean> = {
  orderId: inOrder extends true ? never : string,
  name: string | null,
  link: string,
  price_imported: number,
  price: number,
}

type work<inOrder extends boolean = boolean> = {
  orderId: inOrder extends true ? never : string,
  offerId: string,
  price: number,
  notes: string | null,
  fulfilled: boolean,
}

type order = {
  clientId: string,
  // userId: string,
  draft: boolean,
  imported_products: Array<importedProduct<true>>,
  work: Array<work<true>>,
};

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

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

  if (!(typeof value.orderId === "string" || (patch && value.orderId === undefined) || !needsOrderId)) errors.set("orderId", "is not string");
  if (!(typeof value.offerId === "string" || (patch && value.offerId === undefined))) errors.set("offerId", "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" || (patch && value.is_fulfilled === undefined))) errors.set("is_fulfilled", "is not boolean");

  // TODO: Excessive property checking
  //       Excessive properties should be checked and an error should be thrown if there is one

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

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

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

  if (!(typeof value.orderId === "string" || (patch && value.orderId === undefined) || !needsOrderId)) errors.set("orderId", "is not string");
  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 === "number" || (patch && value.price === undefined))) errors.set("price", "is not number");

  // TODO: Excessive property checking
  //       Excessive properties should be checked and an error should be thrown if there is one

  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<Omit<order, "imported_products" | "work">> : order {
  const errors = new Map<string, string>();

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

  if (!(typeof value.clientId === "string" || (patch && value.clientId === undefined))) errors.set("clientId", "is not string");
  if (!(typeof value.draft === "boolean" || (patch && value.is_draft === undefined))) errors.set("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");

  // TODO: Excessive property checking
  //       Excessive properties should be checked and an error should be thrown if there is one

  if (!patch) {
    const importedProducts = value.imported_products;
    if (importedProducts instanceof Array) {
      for (const i in importedProducts) {
        try {
          checkIsImportedProduct(importedProducts[i], patch, false);
        } 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, false);
        } 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().state;
  const user = await getRequestingUser(e);

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

  await database.order.create({
    data: {
      clientId: BigInt(body.clientId),
      draft: body.draft,
      imported_products: {
        createMany: {
          data: body.imported_products.reduce(
            (pV, cV) => {
              pV.push({
                ...cV,
                id: new Snowflake().state,
              });
              return pV;
            },
            [] as Array<Omit<Prisma.Prisma.ImportedProductCreateManyOrderInput, "orderId">>,
          ),
        },
      },
      work: {
        createMany: {
          data: body.work.reduce(
            (pV, cV) => {
              pV.push({
                ...cV,
                id: new Snowflake().state,
                offerId: BigInt(cV.offerId),
              });
              return pV;
            },
            [] as Array<Omit<Prisma.Prisma.WorkCreateManyOrderInput, "orderId">>,
          ),
        },
      },
      id,
      userId: user.id,
    },
  });

  setResponseStatus(e, 201);
  return getOrder(id).then(prismaToWeb);
});