"use server";

import bcrypt from "bcrypt";
import prisma from "@/lib/prisma";
import { signIn } from "@/lib/auth";
import { authSchema } from "@/lib/zod";
import { CredentialsSignInFormValues } from "@/components/credentials-sign-in-form";
import { CredentialsSignUpFormValues } from "@/components/credentials-sign-up-form";

const saltRounds = 10;

export async function signInWithCredentials(formData: CredentialsSignInFormValues, redirectTo?: string) {
  try {
    // Parse credentials using authSchema for validation
    const { email, password } = await authSchema.parseAsync(formData);

    // Find user by email
    const user = await prisma.user.findUnique({ where: { email } });

    // Check if the user exists
    if (!user) {
      throw new Error("User not found.");
    }

    // Check if the user has a password
    if (!user.password) {
      throw new Error("Invalid credentials.");
    }

    // Check if the password matches
    const passwordMatch = await bcrypt.compare(password, user.password);
    if (!passwordMatch) {
      throw new Error("Incorrect password.");
    }

    await signIn("credentials", { ...formData, redirectTo, redirect: !!redirectTo });
    return { success: true };
  } catch (error) {
    return { error: error instanceof Error ? error.message : "Failed to sign in. Please try again." };
  }
}

export async function signUpWithCredentials(formData: CredentialsSignUpFormValues) {
  try {
    const validatedData = await authSchema.parseAsync(formData);

    // Check if user already exists
    const existingUser = await prisma.user.findUnique({ where: { email: validatedData.email } });
    if (existingUser) {
      throw new Error("User already exists");
    }

    // Hash password and create user
    const pwHash = await bcrypt.hash(validatedData.password, saltRounds);
    const user = await prisma.user.create({
      data: { email: validatedData.email, password: pwHash },
    });

    // Assign admin role if first user
    const userCount = await prisma.user.count();
    if (userCount === 1) {
      await prisma.user.update({ where: { id: user.id }, data: { role: "ADMIN" } });
    }

    return { success: true };
  } catch (error) {
    return { error: error instanceof Error ? error.message : "Registration failed. Please try again." };
  }
}

export async function signInWithGithub(redirectTo?: string) {
  await signIn("github", { redirectTo, redirect: !!redirectTo });
}