<?php

namespace App\Filament\Pages;

use Carbon\Carbon;
use App\Models\Purchase;
use App\Models\Supplier;
use Filament\Pages\Page;
use App\Models\SupplierPayment;
use Illuminate\Contracts\View\View;
use Filament\Forms\Contracts\HasForms;
use Filament\Schemas\Components\Section;
use Filament\Forms\Components\DatePicker;
use Filament\Forms\Concerns\InteractsWithForms;
use Filament\Schemas\Schema;
use App\Exports\AllSuppliersStatementExport;
use Maatwebsite\Excel\Facades\Excel;
use Mpdf\Mpdf;

class AllSuppliersStatementReport extends Page implements HasForms
{
    use InteractsWithForms;

    protected string $view = 'filament.pages.all-suppliers-statement-report';

    public ?array $data = [];
    public ?array $report_data = null;

    protected static string|\UnitEnum|null $navigationGroup = 'suppliers';

    protected static ?int $navigationSort = 5;

    public function getTitle(): string
    {
        return __('filament/admin/reports.all_suppliers_statement');
    }

    public static function getNavigationLabel(): string
    {
        return __('filament/admin/reports.all_suppliers_statement');
    }

    public static function getNavigationGroup(): ?string
    {
        return __('filament.navigation_groups.suppliers');
    }

    public function mount(): void
    {
        $this->form->fill([
            'from_date' => now()->startOfMonth(),
            'to_date' => now()->endOfMonth(),
        ]);
        $this->generateReport();
    }

    public function form(Schema $schema): Schema
    {
        return $schema
            ->statePath('data')
            ->components([
                Section::make(__('filament/admin/reports.filters'))
                    ->columns(2)
                    ->schema([
                        DatePicker::make('from_date')
                            ->label(__('filament/admin/reports.from_date'))
                            ->native(false),

                        DatePicker::make('to_date')
                            ->label(__('filament/admin/reports.to_date'))
                            ->native(false)
                            ->default(now())
                            ->required(),
                    ]),
            ]);
    }

    public function generateReport(): void
    {
        $from_date = isset($this->data['from_date']) ? Carbon::parse($this->data['from_date'])->startOfDay() : null;
        $to_date = Carbon::parse($this->data['to_date'])->endOfDay();

        $suppliers = Supplier::all();
        $suppliers_data = [];

        foreach ($suppliers as $supplier) {
            // حساب الرصيد الافتتاحي
            $opening_balance_query = Purchase::where('supplier_id', $supplier->id);
            if ($from_date) {
                $opening_balance_query->where('created_at', '<', $from_date);
            }
            $opening_balance = $opening_balance_query->sum('remaining_amount');

            // جلب الفواتير في الفترة
            $purchases_query = Purchase::where('supplier_id', $supplier->id);
            if ($from_date) {
                $purchases_query->where('created_at', '>=', $from_date);
            }
            $purchases_query->where('created_at', '<=', $to_date);
            $purchases = $purchases_query->get();

            // جلب المدفوعات في الفترة
            $payments_query = SupplierPayment::where('supplier_id', $supplier->id)
                ->where('status', 'confirmed');
            if ($from_date) {
                $payments_query->where('created_at', '>=', $from_date);
            }
            $payments_query->where('created_at', '<=', $to_date);
            $payments = $payments_query->get();

            // جلب مرتجعات الشراء في الفترة
            $returns_query = \App\Models\PurchaseReturn::where('supplier_id', $supplier->id);
            if ($from_date) {
                $returns_query->where('created_at', '>=', $from_date);
            }
            $returns_query->where('created_at', '<=', $to_date);
            $returns = $returns_query->get();

            $total_purchases = $purchases->sum('total_amount');
            $total_returns = $returns->sum('total_amount');
            $total_paid = $payments->sum('amount');
            // المرتجعات تقلل من ديوننا للمورد
            $closing_balance = $opening_balance + $total_purchases - $total_returns - $total_paid;

            $suppliers_data[] = [
                'supplier' => $supplier,
                'opening_balance' => $opening_balance,
                'total_purchases' => $total_purchases,
                'total_returns' => $total_returns,
                'total_paid' => $total_paid,
                'closing_balance' => $closing_balance,
                'purchases_count' => $purchases->count(),
                'returns_count' => $returns->count(),
                'payments_count' => $payments->count(),
            ];
        }

        // ترتيب حسب الرصيد الختامي (الأعلى أولاً)
        usort($suppliers_data, function($a, $b) {
            return $b['closing_balance'] <=> $a['closing_balance'];
        });

        $this->report_data = [
            'from_date' => $from_date?->format('Y-m-d'),
            'to_date' => $to_date->format('Y-m-d'),
            'suppliers' => $suppliers_data,
            'summary' => [
                'total_suppliers' => count($suppliers_data),
                'total_opening_balance' => array_sum(array_column($suppliers_data, 'opening_balance')),
                'total_purchases' => array_sum(array_column($suppliers_data, 'total_purchases')),
                'total_returns' => array_sum(array_column($suppliers_data, 'total_returns')),
                'total_paid' => array_sum(array_column($suppliers_data, 'total_paid')),
                'total_closing_balance' => array_sum(array_column($suppliers_data, 'closing_balance')),
            ],
        ];
    }

    public function exportExcel()
    {
        if (empty($this->report_data)) {
            $this->generateReport();
        }

        return Excel::download(
            new AllSuppliersStatementExport($this->report_data['suppliers'], $this->data['from_date'], $this->data['to_date']),
            'all-suppliers-statement-' . now()->format('Y-m-d') . '.xlsx'
        );
    }

    public function exportPdf()
    {
        if (empty($this->report_data)) {
            $this->generateReport();
        }

        $mpdf = new Mpdf([
            'mode' => 'utf-8',
            'format' => 'A4',
            'orientation' => 'L',
            'default_font' => 'dejavusans',
            'autoScriptToLang' => true,
            'autoLangToFont' => true,
        ]);

        $mpdf->SetDirectionality('rtl');
        
        $html = view('reports.pdf.all-suppliers-statement', [
            'data' => $this->report_data['suppliers'],
            'from_date' => $this->data['from_date'],
            'to_date' => $this->data['to_date'],
        ])->render();

        $mpdf->WriteHTML($html);

        return response()->streamDownload(function() use ($mpdf) {
            echo $mpdf->Output('', 'S');
        }, 'all-suppliers-statement-' . now()->format('Y-m-d') . '.pdf');
    }

    public static function shouldRegisterNavigation(): bool
    {
        return true;
    }
}