<?php

namespace App\Observers;

use App\Models\Actionlog;
use App\Models\Asset;
use App\Models\Setting;
use Illuminate\Support\Facades\Auth;
use Carbon\Carbon;

class AssetObserver
{
    /**
     * Listen to the Asset updating event. This fires automatically every time an existing asset is saved.
     *
     * @param  Asset  $asset
     * @return void
     */
    public function updating(Asset $asset)
    {
        $attributes = $asset->getAttributes();
        $attributesOriginal = $asset->getRawOriginal();
        $same_checkout_counter = false;
        $same_checkin_counter = false;
        $restoring_or_deleting = false;


        // This is a gross hack to prevent the double logging when restoring an asset
        if (array_key_exists('deleted_at', $attributes)  && array_key_exists('deleted_at', $attributesOriginal)){
            $restoring_or_deleting = (($attributes['deleted_at'] != $attributesOriginal['deleted_at']));
        }

        if (array_key_exists('checkout_counter', $attributes) && array_key_exists('checkout_counter', $attributesOriginal)){
            $same_checkout_counter = (($attributes['checkout_counter'] == $attributesOriginal['checkout_counter']));
        }

        if (array_key_exists('checkin_counter', $attributes)  && array_key_exists('checkin_counter', $attributesOriginal)){
            $same_checkin_counter = (($attributes['checkin_counter'] == $attributesOriginal['checkin_counter']));
        }

        // If the asset isn't being checked out or audited, log the update.
        // (Those other actions already create log entries.)
        if (array_key_exists('assigned_to', $attributes) && array_key_exists('assigned_to', $attributesOriginal)
            && ($attributes['assigned_to'] == $attributesOriginal['assigned_to'])
            && ($same_checkout_counter) && ($same_checkin_counter)
            && ((isset( $attributes['next_audit_date']) ? $attributes['next_audit_date'] : null) == (isset($attributesOriginal['next_audit_date']) ? $attributesOriginal['next_audit_date']: null))
            && ($attributes['last_checkout'] == $attributesOriginal['last_checkout']) && (!$restoring_or_deleting))
        {
            $changed = [];

            foreach ($asset->getRawOriginal() as $key => $value) {
                if ((array_key_exists($key, $asset->getAttributes())) && ($asset->getRawOriginal()[$key] != $asset->getAttributes()[$key])) {
                    $changed[$key]['old'] = $asset->getRawOriginal()[$key];
                    $changed[$key]['new'] = $asset->getAttributes()[$key];
                }
	    }

	    if (empty($changed)){
	        return;
	    }

            $logAction = new Actionlog();
            $logAction->item_type = Asset::class;
            $logAction->item_id = $asset->id;
            $logAction->action_date = date('Y-m-d H:i:s');
            $logAction->created_at = date('Y-m-d H:i:s');
            $logAction->created_by = auth()->id();
            $logAction->log_meta = json_encode($changed);
            $logAction->logaction('update');
        }
    }

    /**
     * Listen to the Asset created event, and increment
     * the next_auto_tag_base value in the settings table when i
     * a new asset is created.
     *
     * @param  Asset  $asset
     * @return void
     */
    public function created(Asset $asset)
    {
        if ($settings = Setting::getSettings()) {
            $tag = $asset->asset_tag;
            $prefix = (string)($settings->auto_increment_prefix ?? '');
            $number = substr($tag, strlen($prefix));
            // IF - auto_increment_assets is on, AND (there is no prefix OR the prefix matches the start of the tag)
            //      AND the rest of the string after the prefix is all digits, THEN...
            if ($settings->auto_increment_assets && ($prefix=='' || strpos($tag, $prefix) === 0) && preg_match('/\d+/',$number) === 1) {
                // new way of auto-trueing-up auto_increment ID's
                $next_asset_tag = intval($number, 10) + 1;
                // we had to use 'intval' because the $number could be '01234' and
                // might get interpreted in Octal instead of decimal

                // only modify the 'next' one if it's *bigger* than the stored base
                //
                if ($next_asset_tag > $settings->next_auto_tag_base && $next_asset_tag < PHP_INT_MAX) {
                    $settings->next_auto_tag_base = $next_asset_tag;
                    $settings->save();
                }

            } else {
                // legacy method
                $settings->increment('next_auto_tag_base');
                $settings->save();
            }
        }

        $logAction = new Actionlog();
        $logAction->item_type = Asset::class; // can we instead say $logAction->item = $asset ?
        $logAction->item_id = $asset->id;
        $logAction->action_date = date('Y-m-d H:i:s');
        $logAction->created_at = date('Y-m-d H:i:s');
        $logAction->created_by = auth()->id();
        if($asset->imported) {
            $logAction->setActionSource('importer');
        }
        $logAction->logaction('create');
    }

    /**
     * Listen to the Asset deleting event.
     *
     * @param  Asset  $asset
     * @return void
     */
    public function deleting(Asset $asset)
    {
        $logAction = new Actionlog();
        $logAction->item_type = Asset::class;
        $logAction->item_id = $asset->id;
        $logAction->created_at = date('Y-m-d H:i:s');
        $logAction->action_date = date('Y-m-d H:i:s');
        $logAction->created_by = auth()->id();
        $logAction->logaction('delete');
    }

    /**
     * Listen to the Asset deleting event.
     *
     * @param  Asset  $asset
     * @return void
     */
    public function restoring(Asset $asset)
    {
        $logAction = new Actionlog();
        $logAction->item_type = Asset::class;
        $logAction->item_id = $asset->id;
        $logAction->action_date = date('Y-m-d H:i:s');
        $logAction->created_at = date('Y-m-d H:i:s');
        $logAction->created_by = auth()->id();
        $logAction->logaction('restore');
    }

    /**
     * Executes every time an asset is saved.
     *
     * This matters specifically because any database fields affected here MUST already exist on
     * the assets table (and/or any related models), or related migrations WILL fail.
     *
     * For example, if there is a database migration that's a bit older and modifies an asset, if the save
     * fires before a field gets created in a later migration and that field in the later migration
     * is used in this observer, it doesn't actually exist yet and the migration will break unless we
     * use saveQuietly() in the migration which skips this observer.
     *
     * @see https://github.com/grokability/snipe-it/issues/13723#issuecomment-1761315938
     */
    public function saving(Asset $asset)
    {
        // determine if calculated eol and then calculate it - this should only happen on a new asset
        if (is_null($asset->asset_eol_date) && !is_null($asset->purchase_date) && ($asset->model->eol > 0)){
            $asset->asset_eol_date = $asset->purchase_date->addMonths($asset->model->eol)->format('Y-m-d');
            $asset->eol_explicit = false; 
        } 

       // determine if explicit and set eol_explicit to true
       if (!is_null($asset->asset_eol_date) && !is_null($asset->purchase_date)) {
            if($asset->model->eol > 0) {
                $months = (int) Carbon::parse($asset->asset_eol_date)->diffInMonths($asset->purchase_date, true);
                if($months != $asset->model->eol) {
                    $asset->eol_explicit = true;
                }
            }
       } elseif (!is_null($asset->asset_eol_date) && is_null($asset->purchase_date)) {
           $asset->eol_explicit = true;
       }
       if ((!is_null($asset->asset_eol_date)) && (!is_null($asset->purchase_date)) && (is_null($asset->model->eol) || ($asset->model->eol == 0))) {
           $asset->eol_explicit = true;
       }

    }
}
