<?php

namespace Ainet\Controllers;

use Ainet\Models\User;

class UserController
{
    public function listUsers()
    {
        $users = User::all();
        $title = 'List users';

        render_view('users.list', compact('title', 'users'));
    }

    public function addUser()
    {
        $title = 'Add user';
        $user = new User();
        $errors = [];

        if (empty($_POST)) {
            return render_view('users.add', compact('title', 'user', 'errors'));
        }

        if (isset($_POST['cancel'])) {
            $this->redirectToHome();
        }

        $user = $this->createUserFromRequest();
        $errors = $this->validateAddForm($user);
        if (count($errors) > 0) {
            return render_view('users.add', compact('title', 'user', 'errors'));
        }

        User::add($user);
        $this->redirectToHome();
    }

    public function editUser()
    {
        $userId = input_value('user_id');
        if (is_null($userId) && isset($_GET['user_id'])) {
            $userId = $_GET['user_id'];
        }

        $user = User::find($userId);
        if (is_null($user)) {
            $this->redirectToHome();
        }
        $errors = [];
        $title = 'Edit user';
        if (empty($_POST)) {
            return render_view('users.edit', compact('title', 'user', 'errors'));
        }

        if (isset($_POST['cancel'])) {
            $this->redirectToHome();
        }

        $this->updateUserFromRequest($user);
        $errors = $this->validateEditableFields($user);
        if (count($errors) > 0) {
            return render_view('users.edit', compact('title', 'user', 'errors'));
        }

        User::save($user);
        $this->redirectToHome();
    }

    public function deleteUser()
    {
        $userId = input_value('user_id');
        if (is_null($userId)) {
            $this->redirectToHome();
        }
        User::delete($userId);
        $this->redirectToHome();
    }

    private function createUserFromRequest()
    {
        $user = new User();
        $user->fullname = input_value('fullname');
        $user->email = input_value('email');
        $user->password = input_value('password');
        $user->type = input_value('user_type');

        return $user;
    }

    private function updateUserFromRequest($user)
    {
        $user->fullname = input_value('fullname');
        $user->email = input_value('email');
        $user->type = input_value('user_type');
    }

    private function validateEditableFields($user)
    {
        $errors = [];
        if (!trim($user->fullname)) {
            $errors['fullname'] = 'Fullname is required';
        } elseif (!filter_var($user->fullname, FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => '/^[a-zA-Z ]+$/']])) {
            $errors['fullname'] = 'Only letters and whitespaces are allowed';
        }

        if (!$user->email) {
            $errors['email'] = 'Email is required';
        } elseif (!filter_var($user->email, FILTER_VALIDATE_EMAIL)) {
            $errors['email'] = 'Invalid email address';
        }

        if (is_null($user->type)) {
            $errors['type'] = 'Type is required';
        } elseif ($user->type < 0 || $user->type > 2) {
            $errors['type'] = 'Invalid type';
        }

        return $errors;
    }

    private function validateAddForm($user)
    {
        $errors = $this->validateEditableFields($user);

        if (!$user->password) {
            $errors['password'] = 'Password is required';
        } elseif (strlen($user->password) < 8) {
            $errors['password'] = 'Password is too short. It must have at least 8 characters.';
        }
        if ($user->password && input_value('password_confirmation') != $user->password) {
            $errors['password_confirmation'] = 'Password confirmation must be equal to password';
        }

        return $errors;
    }

    private function redirectToHome()
    {
        header('Location: users.php');
        exit(0);
    }
}