<?php

namespace App\Models;

use App\Enums\UserPaymentOptionStatus;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasMany;

class UserPaymentOption extends Model
{
    use HasFactory;

    protected $fillable = [
        'user_id',
        'payment_option_id',
        'status',
        'grandfathered_until',
        'legacy_conditions',
        'current_period_start',
        'current_period_end',
        'stripe_subscription_id',
        'cancelled_at',
    ];

    protected function casts(): array
    {
        return [
            'status' => UserPaymentOptionStatus::class,
            'grandfathered_until' => 'date',
            'legacy_conditions' => 'array',
            'current_period_start' => 'date',
            'current_period_end' => 'date',
            'cancelled_at' => 'datetime',
        ];
    }

    /**
     * @return BelongsTo<User, $this>
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    /**
     * @return BelongsTo<PaymentOption, $this>
     */
    public function paymentOption(): BelongsTo
    {
        return $this->belongsTo(PaymentOption::class);
    }

    /**
     * @return BelongsToMany<Company, $this>
     */
    public function companies(): BelongsToMany
    {
        return $this->belongsToMany(Company::class, 'user_payment_option_company')
            ->withPivot('is_active')
            ->withTimestamps();
    }

    /**
     * @return HasMany<UserPayment, $this>
     */
    public function payments(): HasMany
    {
        return $this->hasMany(UserPayment::class);
    }

    /**
     * Aktuell gültige Zahlungsoption (period-aware): aktives Abo innerhalb der
     * laufenden Periode ODER laufender Bestandsschutz. Single Source of Truth
     * für „aktive Zahlungsoption" in API-Gate, Buchungs- und Kontingent-Checks.
     */
    public function scopeActiveNow(Builder $query): Builder
    {
        return $query->where(function (Builder $query): void {
            $query
                ->where(function (Builder $active): void {
                    $active
                        ->where('status', UserPaymentOptionStatus::Active->value)
                        ->whereDate('current_period_start', '<=', now())
                        ->whereDate('current_period_end', '>=', now());
                })
                ->orWhere(fn (Builder $grandfathered): Builder => $grandfathered->grandfatheredNow());
        });
    }

    /**
     * Laufender Bestandsschutz. `grandfathered_until` ist das explizite
     * Legacy-Vertragsende (valid_until_date) und deckelt, wenn gesetzt.
     * Bei offenen Dauervereinbarungen ist es NULL (Regelfall im Import) —
     * dann zählt die laufende, vom MAN-Rechnungslauf fortgerollte Periode
     * (`current_period_end` = next_due_date). Fix 06.07.2026: vorher galt
     * NULL pauschal als abgelaufen, wodurch praktisch kein Legacy-Kunde
     * eine aktive Zahlungsoption hatte („Buchung erforderlich").
     */
    public function scopeGrandfatheredNow(Builder $query): Builder
    {
        return $query
            ->where('status', UserPaymentOptionStatus::Grandfathered->value)
            ->where(function (Builder $query): void {
                $query
                    ->whereDate('grandfathered_until', '>=', now())
                    ->orWhere(function (Builder $rolling): void {
                        $rolling
                            ->whereNull('grandfathered_until')
                            ->whereDate('current_period_end', '>=', now());
                    });
            });
    }
}