<?php

namespace Inc\Api;

class SettingsApi
{
    public $admin_pages = [];
    public $admin_subpages = [];
    public $settings = [];
    public $sections = [];
    public $fields = [];

    public function register()
    {
        if (!empty($this->admin_pages)) {
            add_action('admin_menu', [$this, 'addAdminMenu']);
        }

        if (!empty($this->settings)) {
            add_action('admin_init', [$this, 'registerCustomFields']);
        }
    }

    public function addPages(array $pages)
    {
        $this->admin_pages = $pages;
        return $this;
    }

    public function withSubPage(?string $title = null)
    {
        if (empty($this->admin_pages)) {
            return $this;
        }

        $admin_page = $this->admin_pages[0];
        $this->admin_subpages[] = [
            'parent_slug' => $admin_page['menu_slug'],
            'page_title' => $admin_page['page_title'],
            'menu_title' => $title ?? $admin_page['menu_title'],
            'capability' => $admin_page['capability'],
            'menu_slug' => $admin_page['menu_slug'],
            'callback' => $admin_page['callback']
        ];

        return $this;
    }

    public function addSubPages(array $pages)
    {
        $this->admin_subpages = array_merge($this->admin_subpages, $pages);
        return $this;
    }

    public function addAdminMenu()
    {
        foreach ($this->admin_pages as $page) {
            add_menu_page(
                $page['page_title'],
                $page['menu_title'],
                $page['capability'],
                $page['menu_slug'],
                $page['callback'],
                $page['icon_url'],
                $page['position']
            );
        }

        foreach ($this->admin_subpages as $page) {
            add_submenu_page(
                $page['parent_slug'],
                $page['page_title'],
                $page['menu_title'],
                $page['capability'],
                $page['menu_slug'],
                $page['callback']
            );
        }
    }

    public function setSettings(array $settings)
    {
        $this->settings = $settings;
        return $this;
    }

    public function setSections(array $sections)
    {
        $this->sections = $sections;
        return $this;
    }

    public function setFields(array $fields)
    {
        $this->fields = $fields;
        return $this;
    }

    public function registerCustomFields()
    {
        foreach ($this->settings as $setting) {
            register_setting(
                $setting["option_group"],
                $setting["option_name"],
                (isset($setting["callback"]) ? $setting["callback"] : '')
            );
        }

        foreach ($this->sections as $section) {
            add_settings_section(
                $section["id"],
                $section["title"],
                (isset($section["callback"]) ? $section["callback"] : ''),
                $section["page"]
            );
        }

        foreach ($this->fields as $field) {
            add_settings_field(
                $field["id"],
                $field["title"],
                (isset($field["callback"]) ? $field["callback"] : ''),
                $field["page"],
                $field["section"],
                (isset($field["args"]) ? $field["args"] : '')
            );
        }
    }
}