import { toNextJsHandler } from "better-auth/next-js";
import { eq, sql } from "drizzle-orm";
import { getDb } from "@/db";
import { accounts } from "@/db/schema";
import { getAuth, getCustomerSession } from "@/lib/auth/server";
import { errorResponse, HttpError, readJson, requireSameOrigin } from "@/lib/security/http";

const handlers = toNextJsHandler((request) => getAuth().handler(request));

export async function GET(request: Request) {
  return handlers.GET(request);
}

async function mutate(request: Request) {
  try {
    requireSameOrigin(request);
    const input = await readJson(request.clone());
    const path = new URL(request.url).pathname;
    if (["/admin/create-user", "/admin/set-user-password"].some((endpoint) => path.endsWith(endpoint))) {
      const password = input && typeof input === "object" && "password" in input ? input.password : undefined;
      const newPassword = input && typeof input === "object" && "newPassword" in input ? input.newPassword : undefined;
      const value = password ?? newPassword;
      if (typeof value !== "string" || value.length < 6 || value.length > 128) {
        throw new HttpError(400, "invalid-password-length");
      }
    }
    if (path === "/api/auth/unlink-account") {
      const accountId = input && typeof input === "object" && "accountId" in input
        && typeof input.accountId === "string" ? input.accountId : null;
      const session = accountId ? await getCustomerSession() : null;
      if (accountId && session) {
        const linkedAccounts = await getDb().select({
          id: accounts.id,
          providerId: accounts.providerId,
          hasPassword: sql<boolean>`${accounts.password} is not null`,
        }).from(accounts).where(eq(accounts.userId, session.user.id));
        const accountExists = linkedAccounts.some((account) => account.id === accountId);
        const hasAlternativeSignIn = linkedAccounts.some((account) => account.id !== accountId
          && (account.providerId !== "credential" || account.hasPassword));
        if (accountExists && !hasAlternativeSignIn) {
          return Response.json({
            code: "LAST_AUTH_METHOD",
            message: "กรุณาตั้งรหัสผ่านหรือเชื่อมต่อวิธีเข้าสู่ระบบอื่นก่อนยกเลิกการเชื่อมต่อ Google",
          }, { status: 409, headers: { "Cache-Control": "no-store" } });
        }
      }
    }
    return await getAuth().handler(request);
  } catch (cause) {
    return errorResponse(cause);
  }
}

export const POST = mutate;
export const PATCH = mutate;
export const PUT = mutate;
export const DELETE = mutate;