<?php

namespace App\Http\Controllers;

use App\Models\Transaksi;
use Carbon\Carbon;
use Carbon\CarbonPeriod;
use Illuminate\Http\Request;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection;

class LaporanController extends Controller
{
    public function ringkasan(Request $request)
    {
        $filter = $request->query('filter', 'bulan');
        $page = $request->query('page', 1);
        
        $allSalesNames = Transaksi::select('nama_sales')->distinct()->pluck('nama_sales');

        if ($filter === 'hari') {
            return $this->laporanHarian($page, $allSalesNames);
        }

        return $this->laporanBulanan($page, $allSalesNames);
    }

    private function laporanHarian(int $page, Collection $allSalesNames)
    {
        $perPage = 7;
        
        $endDate = Carbon::today()->subDays(($page - 1) * $perPage);
        $startDate = $endDate->copy()->subDays($perPage - 1);

        $transaksis = Transaksi::with('itemTransaksi.item.produk')
            ->whereBetween('created_at', [$startDate->startOfDay(), $endDate->endOfDay()])
            ->orderBy('created_at', 'desc')
            ->get();

        $transaksisByDay = $transaksis->groupBy(function ($transaksi) {
            return Carbon::parse($transaksi->created_at)->format('Y-m-d');
        });

        $period = CarbonPeriod::create($startDate, $endDate);
        $laporan = [];

        foreach ($period as $date) {
            $dateString = $date->format('Y-m-d');
            $tanggalFormatted = $date->isoFormat('dddd, D MMMM Y');

            if (isset($transaksisByDay[$dateString])) {
                $transaksisPerTanggal = $transaksisByDay[$dateString];
                
                $salesDataTransaksi = $transaksisPerTanggal->groupBy('nama_sales')
                    ->map(fn ($transaksisPerSales) => $this->hitungDataSales($transaksisPerSales));

                $fullSalesData = $allSalesNames->map(function ($namaSales) use ($salesDataTransaksi) {
                    return $salesDataTransaksi->get($namaSales) ?? $this->defaultSalesData($namaSales);
                });

                $totalItem = $fullSalesData->sum('item_terjual');
                $totalBerat = $fullSalesData->sum('berat_terjual_raw');
                $totalPendapatan = $fullSalesData->sum('pendapatan_raw');

                $laporan[$dateString] = [
                    'tanggal' => $tanggalFormatted,
                    'total_item_terjual' => $totalItem > 0 ? $totalItem : '-',
                    'total_berat' => $totalBerat > 0 ? number_format($totalBerat, 2, ',', '.') . 'g' : '-',
                    'total_pendapatan' => $totalPendapatan > 0 ? 'Rp' . number_format($totalPendapatan, 2, ',', '.') : '-',
                    'sales' => $this->formatSalesDataValues($fullSalesData)->values(),
                ];
            } else {
                $laporan[$dateString] = [
                    'tanggal' => $tanggalFormatted,
                    'total_item_terjual' => '-',
                    'total_berat' => '-',
                    'total_pendapatan' => '-',
                    'sales' => [],
                ];
            }
        }
        $totalHariUntukPaginasi = 365;
        $paginatedData = new LengthAwarePaginator(
            array_reverse(array_values($laporan)),
            $totalHariUntukPaginasi,
            $perPage,
            $page,
            ['path' => request()->url(), 'query' => request()->query()]
        );

        return response()->json($paginatedData);
    }

    private function laporanBulanan(int $page, Collection $allSalesNames)
    {
        $perPage = 12;

        $transaksis = Transaksi::with('itemTransaksi.item.produk')
            ->orderBy('created_at', 'desc')
            ->get();

        $laporan = $transaksis->groupBy(function ($transaksi) {
            return Carbon::parse($transaksi->created_at)->format('F Y');
        })
        ->map(function ($transaksisPerTanggal, $tanggal) use ($allSalesNames) {
            
            $salesDataTransaksi = $transaksisPerTanggal
                ->groupBy('nama_sales')
                ->map(fn ($transaksisPerSales) => $this->hitungDataSales($transaksisPerSales));

            $fullSalesData = $allSalesNames->map(function ($namaSales) use ($salesDataTransaksi) {
                return $salesDataTransaksi->get($namaSales) ?? $this->defaultSalesData($namaSales);
            });

            $totalItem = $fullSalesData->sum('item_terjual');
            $totalBerat = $fullSalesData->sum('berat_terjual_raw');
            $totalPendapatan = $fullSalesData->sum('pendapatan_raw');

            return [
                'tanggal' => $tanggal,
                'total_item_terjual' => $totalItem > 0 ? $totalItem : '-',
                'total_berat' => $totalBerat > 0 ? number_format($totalBerat, 2, ',', '.') . 'g' : '-',
                'total_pendapatan' => $totalPendapatan > 0 ? 'Rp' . number_format($totalPendapatan, 2, ',', '.') : '-',
                'sales' => $this->formatSalesDataValues($fullSalesData)->values(),
            ];
        });

        $paginatedData = new LengthAwarePaginator(
            $laporan->forPage($page, $perPage)->values(),
            $laporan->count(),
            $perPage,
            $page,
            ['path' => request()->url(), 'query' => request()->query()]
        );
        
        return response()->json($paginatedData);
    }

    private function hitungDataSales(Collection $transaksisPerSales): array
    {
        $itemTerjual = $transaksisPerSales->sum(fn ($t) => $t->itemTransaksi->count());
        $beratTerjual = $transaksisPerSales->sum(fn ($t) => 
            $t->itemTransaksi->sum(fn ($it) => $it->item->produk->berat ?? 0)
        );
        $pendapatan = $transaksisPerSales->sum('total_harga');

        return [
            'nama' => $transaksisPerSales->first()->nama_sales,
            'item_terjual' => $itemTerjual,
            'berat_terjual_raw' => $beratTerjual,
            'pendapatan_raw' => $pendapatan,
        ];
    }
    
    private function defaultSalesData(string $namaSales): array
    {
        return [
            'nama' => $namaSales,
            'item_terjual' => 0,
            'berat_terjual_raw' => 0,
            'pendapatan_raw' => 0,
        ];
    }

    private function formatSalesDataValues(Collection $salesData): Collection
    {
        return $salesData->map(function ($sale) {
            $sale['item_terjual'] = $sale['item_terjual'] > 0 ? $sale['item_terjual'] : '-';
            $sale['berat_terjual'] = $sale['berat_terjual_raw'] > 0 ? number_format($sale['berat_terjual_raw'], 2, ',', '.') . 'g' : '-';
            $sale['pendapatan'] = $sale['pendapatan_raw'] > 0 ? 'Rp' . number_format($sale['pendapatan_raw'], 2, ',', '.') : '-';
            
            unset($sale['berat_terjual_raw'], $sale['pendapatan_raw']);
            return $sale;
        });
    }
}