"use server";

import { prisma } from "../lib/prisma";
import { revalidatePath } from "next/cache";
import { z } from "zod";

// Define the state shape returned to the client
export type FormState = {
  success: boolean;
  message?: string;
  errors?: {
    name?: string[];
    email?: string[];
    pass?: string[];
  };
};

// Zod Validation Schema
const UserSchema = z.object({
  name: z
    .string({ error: "Name must be a string" })
    .min(2, { error: "Name must be at least 2 characters" }),
  email: z.email({ error: "Please enter a valid email address" }), // Direct top-level function
  pass: z.string().min(6, { error: "Password must be at least 6 characters" }),
});

// --- ADD USER SERVER ACTION ---
export async function addUserAction(
  prevState: FormState,
  formData: FormData,
): Promise<FormState> {
  // 1. Validate Form Input with Zod
  const validatedFields = UserSchema.safeParse({
    name: formData.get("name"),
    email: formData.get("email"),
    pass: formData.get("pass"),
  });

  // If validation fails, return targeted field errors
  if (!validatedFields.success) {
    // Map error issues directly to field names
    const fieldErrors: Record<string, string[]> = {};

    for (const issue of validatedFields.error.issues) {
      const field = issue.path[0] as string;
      if (field) {
        fieldErrors[field] = fieldErrors[field] || [];
        fieldErrors[field].push(issue.message);
      }
    }
    return {
      success: false,
      message: "Validation failed. Please check your inputs.",
      errors: fieldErrors,
    };
  }

  const { name, email, pass } = validatedFields.data;

  // 2. Perform Database Mutation
  try {
    await prisma.user.create({
      data: { name, email, password: pass },
    });

    revalidatePath("/users");
    return { success: true, message: "User added successfully!" };
  } catch (error) {
    console.error("Failed to create user:", error);
    return {
      success: false,
      message: "Failed to create user. Email may already be registered.",
    };
  }
}