import { pgEnum, pgTable, serial, text, timestamp } from 'drizzle-orm/pg-core';
import { createInsertSchema, createSelectSchema } from 'drizzle-zod';
import { z } from 'zod';

const users = pgTable('users', {
  id: serial('id').primaryKey(),
  name: text('name').notNull(),
  email: text('email').notNull(),
  role: text('role', { enum: ['admin', 'user'] }).notNull(),
  createdAt: timestamp('created_at').notNull().defaultNow(),
});

// Schema for inserting a user - can be used to validate API requests
const insertUserSchema = createInsertSchema(users);

// Schema for updating a user - can be used to validate API requests
const updateUserSchema = createUpdateSchema(users);

// Schema for selecting a user - can be used to validate API responses
const selectUserSchema = createSelectSchema(users);

// Overriding the fields
const insertUserSchema = createInsertSchema(users, {
  role: z.string(),
});

// Refining the fields - useful if you want to change the fields before they become nullable/optional in the final schema
const insertUserSchema = createInsertSchema(users, {
  id: (schema) => schema.positive(),
  email: (schema) => schema.email(),
  role: z.string(),
});

// Usage

const user = insertUserSchema.parse({
  name: 'John Doe',
  email: 'johndoe@test.com',
  role: 'admin',
});

// Zod schema type is also inferred from the table schema, so you have full type safety
const requestSchema = insertUserSchema.pick({ name: true, email: true });