<?php
class ChatSaleApi {
    private const REGISTER_ENDPOINT = 'chatsale/register';
    private const UPDATE_ASSISTANT_ENDPOINT = 'chatsale/assistant_id/set_settings';
    private const AUTH_ENDPOINT = 'account/login';

    private array $headers = [
        "Accept" => "application/json",
        "Content-Type" => "application/json",
    ];

    private string $version = 'v1';
    private string $base_url = 'https://app.chatsale.io/api';
    private string $register_url = 'https://chat.chatsale.io/';

    public function __construct()
    {

    }

    public function register(array $user, string $prompt,  array $appearance): ?array
    {
        $response = wp_remote_post(
            $this->makeRegisterUrl(self::REGISTER_ENDPOINT),
            [
                'headers' => $this->headers,
                'body' => json_encode([
                    'appearance' => $appearance,
                    'prompt' => $prompt,
                    'user' => $user,
                    'register_type' => "wordpress"
                ])
            ]
        );
        if (wp_remote_retrieve_response_code($response) != 201 && wp_remote_retrieve_response_code($response) != 200) {
            return  ["error" => 'Email already exists. Please login or use another email address.'];
        } else {
            $body = wp_remote_retrieve_body($response);
            return json_decode($body, true);
        }
    }

    public function update_assistant($assistantId, $assistantSettings) :?array {
        $url = str_replace('assistant_id', $assistantId, self::UPDATE_ASSISTANT_ENDPOINT);
        
        $response = wp_remote_request(
            $this->makeRegisterUrl($url), 
            [
                'method' => 'PUT', 
                'headers' => $this->headers, 
                'body' => json_encode([
                    'appearance' => $assistantSettings['appearance'],
                    'prompt' => $assistantSettings['prompt'],
                    'closing_message' => $assistantSettings['base']['closing_message'],
                    'welcome_message' => $assistantSettings['base']['welcome_message'],
                    'role' => $assistantSettings['base']['role'],
                    'questions' => $assistantSettings['base']['questions']
                ])
            ]
        );        
        if (wp_remote_retrieve_response_code($response) != 201 && wp_remote_retrieve_response_code($response) != 200) {
            return  ["error" => 'Email already exists. Please login or use another email address.'];
        } else {
            $body = wp_remote_retrieve_body($response);
            return json_decode($body, true);
        }
    }

    public function auth(string $email, string $password): array
    {
        $response = wp_remote_post(
            $this->makeUrl(self::AUTH_ENDPOINT),
            [
                'headers' => $this->headers,
                'body' => json_encode([
                    'email' => $email,
                    'password' => $password,
                ])
            ]
        );
        if (wp_remote_retrieve_response_code($response) != 201 && wp_remote_retrieve_response_code($response) != 200) {
            if (wp_remote_retrieve_response_code($response) == 403) {
                return  ["error" => 'Incorrect password or email'];
            }
            $error = json_decode(wp_remote_retrieve_body($response));
            return  ["error" => $error['error']];
        } else {
            $body = wp_remote_retrieve_body($response);
            return json_decode($body, true);
        }
    }

    private function makeRegisterUrl(string $endpoint): string
    {
        return implode('/',[$this->register_url , $endpoint]);
    }

    private function makeUrl(string $endpoint): string
    {
        return implode('/',[$this->base_url , $this->version , $endpoint]);
    }
}