import { initTRPC } from "@trpc/server";
import { type CreateNextContextOptions } from "@trpc/server/adapters/next";
import superjson from "superjson";
import { ZodError } from "zod";

import { db } from "~/server/db";

/**
 * 1. CONTEXT
 */

type CreateContextOptions = Record<string, never>;

const createInnerTRPCContext = (_opts: CreateContextOptions) => {
  return {
    db,
  };
};

export const createTRPCContext = (_opts: CreateNextContextOptions) => {
  return createInnerTRPCContext({});
};

/**
 * 2. INITIALIZATION
 */

const t = initTRPC.context<typeof createTRPCContext>().create({
  transformer: superjson,
  errorFormatter({ shape, error }) {
    return {
      ...shape,
      data: {
        ...shape.data,
        zodError:
          error.cause instanceof ZodError ? error.cause.flatten() : null,
      },
    };
  },
});

/**
 * 3. ROUTER & PROCEDURE (THE IMPORTANT BIT)
 */

export const createTRPCRouter = t.router;

export const publicProcedure = t.procedure;