import { betterAuth } from "better-auth";
import { prismaAdapter } from "better-auth/adapters/prisma";
import { nextCookies } from "better-auth/next-js";
import { username } from "better-auth/plugins";
import { createAuthMiddleware, APIError } from "better-auth/api";
import { prisma } from "./lib/db";
import {
  sendEmail,
  generateVerificationEmailHtml,
  generateResetPasswordEmailHtml,
} from "./lib/email";

export const auth = betterAuth({
  database: prismaAdapter(prisma, {
    provider: "postgresql",
  }),
  emailAndPassword: {
    enabled: true,
    requireEmailVerification: true,
    sendResetPassword: async ({ user, url }) => {
      void sendEmail({
        to: user.email,
        subject: "重置您的密码 - Learn Languages",
        html: generateResetPasswordEmailHtml(url, user.name || "用户"),
      });
    },
  },
  emailVerification: {
    sendOnSignUp: true,
    sendVerificationEmail: async ({ user, url }) => {
      void sendEmail({
        to: user.email,
        subject: "验证您的邮箱 - Learn Languages",
        html: generateVerificationEmailHtml(url, user.name || "用户"),
      });
    },
  },
  socialProviders: {
    github: {
      clientId: process.env.GITHUB_CLIENT_ID as string,
      clientSecret: process.env.GITHUB_CLIENT_SECRET as string,
    },
  },
  plugins: [nextCookies(), username()],
  hooks: {
    before: createAuthMiddleware(async (ctx) => {
      if (ctx.path !== "/sign-up/email" && ctx.path !== "/update-user") return;

      const body = ctx.body as { username?: string };
      if (!body.username || body.username.trim() === "") {
        throw new APIError("BAD_REQUEST", {
          message: "Username is required",
        });
      }
    }),
  },
});