<?php

namespace App\Repositories;

use App\Models\UserAbo;
use App\Services\AboHelper;

class AboRepository extends BaseRepository
{
    private const LOCK_DAYS_CHANGE = 10;

    private const LOCK_DAYS_PAUSE_CANCEL = 3;

    public function __construct()
    {
        // $this->model = $model;
    }

    public function setModel(UserAbo $model)
    {
        $this->model = $model;
    }

    public function update($data)
    {
        if (isset($data['action'])) {
            if ($data['action'] === 'abo_update_settings') {
                if ($this->validate($data)) {
                    $this->updateStatus($data);
                    $this->model->abo_interval = $data['abo_interval'];
                    $nextDate = $this->calculateNewNextDate($data['abo_interval']);
                    $this->model->next_date = $nextDate;
                    $this->model->save();

                    $daysUntilNext = AboHelper::calendarDaysUntil(now(), $nextDate);
                    \Session()->flash('alert-warning', __('abo.warning_next_date_info', ['days' => $daysUntilNext, 'date' => $nextDate->format('d.m.Y')]));

                    return true;
                }

                return false;
            }
        }

        return false;
    }

    public function create($data) {}

    private function updateStatus($data)
    {
        // Handle cancellation
        if (isset($data['abo_cancel']) && $data['abo_cancel'] == 'true') {
            // Sperre: 3 Tage vor Ausführung kann nicht mehr pausiert/gekündigt werden
            if ($this->model->next_date) {
                $daysUntil = (int) now()->diffInDays(\Carbon\Carbon::parse($this->model->next_date), false);
                if ($daysUntil >= 0 && $daysUntil < self::LOCK_DAYS_PAUSE_CANCEL) {
                    \Session()->flash('alert-error', __('abo.error_cancel_locked', ['days' => $daysUntil]));

                    return;
                }
            }

            // Status 4 = abo_cancel (storniert/gekündigt)
            $this->model->status = 4;
            $this->model->active = false;
            $this->model->cancel_date = now();
            $this->model->save();

            return;
        }

        $active = (isset($data['abo_is_active']) && $data['abo_is_active']) ? true : false;
        // Sperre: 3 Tage vor Ausführung kann nicht mehr pausiert werden
        if ($this->model->active && ! $active && $this->model->next_date) {
            $daysUntil = (int) now()->diffInDays(\Carbon\Carbon::parse($this->model->next_date), false);
            if ($daysUntil >= 0 && $daysUntil < self::LOCK_DAYS_PAUSE_CANCEL) {
                \Session()->flash('alert-error', __('abo.error_pause_locked', ['days' => $daysUntil]));

                return;
            }
        }
        // if status is active and active is false, set status to inactive
        if ($this->model->active && ! $active) {
            if ($this->model->status == 2) { // okay
                $this->model->status = 6; // inactive
                $this->model->active = false;
                $this->model->save();
            }
        }
        if (! $this->model->active && $active) {
            if ($this->model->status == 6) { // inactive
                $this->model->status = 2; // okay
                $this->model->active = true;
                $this->model->save();
            }
        }
        $this->model->active = $active;
    }

    private function validate($data)
    {
        if ($data['view'] !== 'admin' && $data['view'] !== 'portal') {
            if ($this->model->is_for === 'me' && $this->model->user_id !== \Auth::user()->id) {
                \Session()->flash('alert-error', 'Unauthorized action. User ID does not match.');

                return false;
            }
            if ($this->model->is_for === 'ot' && $this->model->member_id !== \Auth::user()->id) {
                \Session()->flash('alert-error', 'Unauthorized action. User ID does not match.');

                return false;
            }
            if ($data['view'] === 'me' && $this->model->is_for !== 'me') {
                \Session()->flash('alert-error', 'Unauthorized action. Is not for me');

                return false;
            }
            if ($data['view'] === 'ot' && $this->model->is_for !== 'ot') {
                \Session()->flash('alert-error', 'Unauthorized action. Is not your customer');

                return false;
            }
        }
        if (! in_array($data['abo_interval'], \App\Models\UserAbo::$aboDeliveryDays)) {
            \Session()->flash('alert-error', __('abo.error_abo_interval'));

            return false;
        }

        // Sperre: 10 Tage vor nächster Ausführung keine Änderungen mehr (Pakete werden vorgepackt)
        if ($this->model->next_date) {
            $daysUntilExecution = (int) now()->diffInDays(\Carbon\Carbon::parse($this->model->next_date), false);
            if ($daysUntilExecution >= 0 && $daysUntilExecution < self::LOCK_DAYS_CHANGE) {
                \Session()->flash('alert-error', __('abo.error_change_locked', ['days' => $daysUntilExecution]));

                return false;
            }
        }

        // Prüfung: Das neue berechnete Ausführungsdatum muss mindestens LOCK_DAYS_CHANGE Tage entfernt sein.
        // Falls next_date bereits in einem zukünftigen Monat liegt, wird das neue Datum in diesem Monat berechnet.
        $newNextDate = $this->calculateNewNextDate($data['abo_interval']);
        $daysUntilNewDate = (int) now()->diffInDays($newNextDate, false);
        if ($daysUntilNewDate < self::LOCK_DAYS_CHANGE) {
            \Session()->flash('alert-error', __('abo.error_abo_interval_too_soon', ['days' => $daysUntilNewDate]));

            return false;
        }

        return true;
    }

    /**
     * Berechnet das neue Ausführungsdatum unter Berücksichtigung des aktuellen next_date.
     * Falls next_date bereits in einem zukünftigen Monat liegt, wird der Monatsanfang
     * dieses Monats als Referenz verwendet, sodass der neue Tag im selben Monat landet.
     */
    private function calculateNewNextDate(int $aboInterval): \Carbon\Carbon
    {
        $referenceDate = now();

        if ($this->model->next_date) {
            $currentNextDate = \Carbon\Carbon::parse($this->model->next_date);

            if ($currentNextDate->format('Y-m') > now()->format('Y-m')) {
                $referenceDate = $currentNextDate->startOfMonth();
            }
        }

        return AboHelper::setNextDate($referenceDate, $aboInterval);
    }
}