<?php
namespace DayTidy;

use Webilia\WP\Helpers\Arr;
use Webilia\WP\Interfaces\Initiable;
use DayTidy\Interfaces\Menu;
use DayTidy\Menu\Base;
use DayTidy\Admin\Screens;
use DayTidy\Menu\Menus\Dashboard;
use DayTidy\Menu\Menus\HelpSupport;
use DayTidy\Menu\Menus\Settings;
use DayTidy\Menu\Selection;
use DayTidy\Menu\Menus\WebiliaConnect;
use DayTidy\Connect\Permissions;
use DayTidy\Menu\Menus\Offerings;
use DayTidy\Menu\Menus\Resources;
use DayTidy\Menu\Menus\Onboarding;
use DayTidy\Posts\Offering;

class Menus implements Initiable
{
    public function init(): void
    {
        // Init Menus
        add_action('init', [$this, 'fire'], 999);

        // Register Menus
        add_action('admin_menu', [$this, 'register']);

        // Menu Selection
        (new Selection())->init();

        // Shared backend header
        Screens::init();

        // Add Separator
        add_action('admin_init', [$this, 'separator']);
    }

    /**
     * Initialize all menus
     * @return void
     */
    public function fire(): void
    {
        // Get all Menus
        $menus = $this->all();

        foreach ($menus as $menu)
        {
            // Init Menu
            if ($menu instanceof Initiable) $menu->init();
        }
    }

    public function register(): void
    {
        // Get all Menus
        $menus = $this->all();

        foreach ($menus as $menu)
        {
            // Not an instance of Menu
            if (!($menu instanceof Menu)) continue;

            // Main Menu
            if ($menu->type() === Base::MAIN)
            {
                $hook = add_menu_page(
                    $menu->title(),
                    $menu->label(),
                    $menu->capability(),
                    $menu->slug(),
                    $menu->callback(),
                    $menu->icon(),
                    $menu->position()
                );
            }
            // Sub-Menu
            else
            {
                $hook = add_submenu_page(
                    $menu->parent(),
                    $menu->title(),
                    $menu->label(),
                    $menu->capability(),
                    $menu->slug(),
                    $menu->callback(),
                    $menu->position()
                );
            }

            if (is_string($hook) && $hook !== '') Screens::menu($hook, $menu);
        }

        // Keep these routes registered, including their capabilities and load hooks.
        // They are reached through the Bookings and Settings header tabs.
        remove_submenu_page('', Resources::PAGE);
        remove_submenu_page('', Onboarding::PAGE);

        // WordPress creates the first submenu item from the main menu label.
        // Keep the main menu branded as DayTidy, but present its home link as
        // Home in the expanded submenu.
        global $submenu;
        if (isset($submenu['daytidy'][0][0]))
        {
            $submenu['daytidy'][0][0] = esc_html__('Home', 'daytidy');
        }
    }

    /**
     * Get all the Menus
     * @return mixed[]
     */
    public function all(): array
    {
        static $menus = null;

        // Fetch Menus
        if (!$menus)
        {
            $menus = [];
            $menus[] = new Dashboard();
            if (post_type_exists(Offering::PT)) $menus[] = new Offerings();
            $menus[] = new Settings();
            $menus[] = new HelpSupport();
            if (Permissions::manage()) $menus[] = new WebiliaConnect();

            // Third Party Menus
            $menus = apply_filters('DayTidy/F__DayTidy/Menus__all/menus', $menus);
        }

        // Sort
        usort($menus, function ($a, $b)
        {
            // Ensure 'menu' type always comes first
            if ($a->type() === 'menu' && $b->type() !== 'menu') return -1;
            if ($a->type() !== 'menu' && $b->type() === 'menu') return 1;

            return $a->position() <=> $b->position();
        });

        return $menus;
    }

    /**
     * Add separator before DayTidy menus
     * @return void
     */
    public function separator(): void
    {
        if (!is_admin()) return;

        global $menu;
        if (Arr::not($menu)) return;

        $sep = null;
        $do_start = null;
        $start = null;
        $end = null;
        $do_end = null;

        $i = 0;
        $previous = null;
        foreach ($menu as $m)
        {
            // Next menu of end is separator, so we don't need to add separator again
            if ($end and is_null($do_end) and isset($m['4']) and strpos($m['4'], 'menu-separator') !== false) $do_end = false;
            else if ($end and is_null($do_end)) $do_end = true;

            if (!$sep and isset($m['4']) and strpos($m['4'], 'menu-separator') !== false) $sep = $m;
            if (!$start and isset($m['5']) and strpos($m['5'], 'page_daytidy') !== false) $start = $i;
            if (!$end and isset($m['5']) and strpos($m['5'], 'page_daytidy') !== false) $end = $i + 1;

            // Previous menu of start is separator, so we don't need to add separator again
            if ($start and is_null($do_start) and isset($previous['4']) and strpos($previous['4'], 'menu-separator') !== false) $do_start = false;
            else if ($start and is_null($do_start)) $do_start = true;

            $i++;
            $previous = $m;

            if ($sep and $start and $end and !is_null($do_end)) break;
        }

        if (is_null($do_start)) $do_start = true;

        // Start not found. Maybe the current user is not an administrator
        if (!$start) return;

        // Separator not found
        if (!$sep) return;

        // Add First Separator
        if ($do_start) $menu = array_merge(
            array_slice($menu, 0, $start),
            [$sep],
            array_slice($menu, $start)
        );

        if (isset($menu[$start - 1])) $menu[$start - 1][4] .= ' menu-top-last';
        if (isset($menu[$start + 1])) $menu[$start + 1][4] .= ' menu-top-first';

        if (isset($menu[$end - 1])) $menu[$end - 1][4] .= ' menu-top-last';
        if (isset($menu[$end + 1])) $menu[$end + 1][4] .= ' menu-top-first';
    }
}