<?php

namespace App\Filament\Resources\ScheduledGivingDonationResource\Pages;

use App\Filament\Resources\ScheduledGivingDonationResource;
use App\Models\ScheduledGivingCampaign;
use App\Models\ScheduledGivingDonation;
use Filament\Resources\Components\Tab;
use Filament\Resources\Pages\ListRecords;
use Illuminate\Database\Eloquent\Builder;

class ListScheduledGivingDonations extends ListRecords
{
    protected static string $resource = ScheduledGivingDonationResource::class;

    public function getHeading(): string
    {
        return 'Scheduled Giving';
    }

    public function getSubheading(): string
    {
        $current = $this->currentSeasonCount();
        return "{$current} subscribers this season.";
    }

    /** Count real current-season subscribers using the model directly (safe) */
    private function currentSeasonCount(): int
    {
        return ScheduledGivingDonation::query()
            ->whereNotNull('customer_id')
            ->where('total_amount', '>', 0)
            ->whereNull('deleted_at')
            ->whereHas('payments', fn ($q) => $q->whereNull('deleted_at'))
            ->whereHas('payments', fn ($q) => $q->whereNull('deleted_at')->where('expected_at', '>', now()))
            ->count();
    }

    /**
     * Apply "real subscriber" filter using whereIn subqueries
     * instead of whereHas — avoids null model crash during tab init.
     */
    private function applyReal(Builder $q): Builder
    {
        return $q
            ->whereNotNull('customer_id')
            ->where('total_amount', '>', 0)
            ->whereNull('scheduled_giving_donations.deleted_at')
            ->whereIn('scheduled_giving_donations.id', fn ($sub) => $sub
                ->select('scheduled_giving_donation_id')
                ->from('scheduled_giving_payments')
                ->whereNull('deleted_at'));
    }

    /** Real + has future payment = current season */
    private function applyCurrentSeason(Builder $q): Builder
    {
        return $this->applyReal($q)
            ->whereIn('scheduled_giving_donations.id', fn ($sub) => $sub
                ->select('scheduled_giving_donation_id')
                ->from('scheduled_giving_payments')
                ->whereNull('deleted_at')
                ->where('expected_at', '>', now()));
    }

    /** Real + NO future payments = expired */
    private function applyExpired(Builder $q): Builder
    {
        return $this->applyReal($q)
            ->whereNotIn('scheduled_giving_donations.id', fn ($sub) => $sub
                ->select('scheduled_giving_donation_id')
                ->from('scheduled_giving_payments')
                ->whereNull('deleted_at')
                ->where('expected_at', '>', now()));
    }

    public function getTabs(): array
    {
        $campaigns = ScheduledGivingCampaign::all();
        $currentCount = $this->currentSeasonCount();

        $tabs = [];

        $tabs['current'] = Tab::make('This Season')
            ->icon('heroicon-o-sun')
            ->badge($currentCount)
            ->badgeColor('success')
            ->modifyQueryUsing(fn (Builder $q) => $this->applyCurrentSeason($q));

        foreach ($campaigns as $c) {
            $slug = str($c->title)->slug()->toString();
            $count = ScheduledGivingDonation::query()
                ->whereNotNull('customer_id')
                ->where('total_amount', '>', 0)
                ->whereNull('deleted_at')
                ->where('scheduled_giving_campaign_id', $c->id)
                ->whereHas('payments', fn ($q) => $q->whereNull('deleted_at'))
                ->whereHas('payments', fn ($q) => $q->whereNull('deleted_at')->where('expected_at', '>', now()))
                ->count();

            if ($count === 0) continue;

            $tabs[$slug] = Tab::make($c->title)
                ->icon('heroicon-o-calendar')
                ->badge($count)
                ->badgeColor('primary')
                ->modifyQueryUsing(fn (Builder $q) => $this->applyCurrentSeason($q)
                    ->where('scheduled_giving_campaign_id', $c->id));
        }

        // Failed (current season)
        $failedCount = ScheduledGivingDonation::query()
            ->whereNotNull('customer_id')
            ->where('total_amount', '>', 0)
            ->whereNull('deleted_at')
            ->whereHas('payments', fn ($q) => $q->whereNull('deleted_at'))
            ->whereHas('payments', fn ($q) => $q->whereNull('deleted_at')->where('expected_at', '>', now()))
            ->whereHas('payments', fn ($q) => $q->where('is_paid', false)->where('attempts', '>', 0)->whereNull('deleted_at'))
            ->count();

        if ($failedCount > 0) {
            $tabs['failed'] = Tab::make('Failed')
                ->icon('heroicon-o-exclamation-triangle')
                ->badge($failedCount)
                ->badgeColor('danger')
                ->modifyQueryUsing(fn (Builder $q) => $this->applyCurrentSeason($q)
                    ->whereIn('scheduled_giving_donations.id', fn ($sub) => $sub
                        ->select('scheduled_giving_donation_id')
                        ->from('scheduled_giving_payments')
                        ->where('is_paid', false)
                        ->where('attempts', '>', 0)
                        ->whereNull('deleted_at')));
        }

        // Past seasons
        $expiredCount = ScheduledGivingDonation::query()
            ->whereNotNull('customer_id')
            ->where('total_amount', '>', 0)
            ->whereNull('deleted_at')
            ->whereHas('payments', fn ($q) => $q->whereNull('deleted_at'))
            ->whereDoesntHave('payments', fn ($q) => $q->whereNull('deleted_at')->where('expected_at', '>', now()))
            ->count();

        $tabs['past'] = Tab::make('Past Seasons')
            ->icon('heroicon-o-archive-box')
            ->badge($expiredCount > 0 ? $expiredCount : null)
            ->badgeColor('gray')
            ->modifyQueryUsing(fn (Builder $q) => $this->applyExpired($q));

        $tabs['all'] = Tab::make('All')
            ->icon('heroicon-o-squares-2x2')
            ->modifyQueryUsing(fn (Builder $q) => $this->applyReal($q));

        return $tabs;
    }

    protected function getHeaderActions(): array
    {
        return [];
    }

    public function getDefaultActiveTab(): string|int|null
    {
        return 'current';
    }
}