<?php

namespace App\Helpers;

use App\Models\Nampan;
use App\Models\Sales;
use App\Models\Produk;
use Carbon\Carbon;
use Illuminate\Support\Collection;
use Illuminate\Pagination\LengthAwarePaginator;

class LaporanHelper
{
    public const CURRENCY_SYMBOL = 'Rp ';
    public const WEIGHT_UNIT = ' g';
    public const DEFAULT_DISPLAY = '-';

    public function calculateTotals(Collection $data): array
    {
        $totalPendapatan = $data->sum('pendapatan');
        $totalItemTerjual = $data->sum('jumlah_item_terjual');
        $totalBeratTerjual = $data->sum('berat_terjual');

        return [
            'total_item_terjual' => $totalItemTerjual,
            'total_berat_terjual' => $this->formatWeight($totalBeratTerjual),
            'total_pendapatan' => $this->formatCurrency($totalPendapatan),
        ];
    }

    public function getAllNampanWithPagination(int $page, int $perPage): LengthAwarePaginator
    {
        $semuaNampan = Nampan::select('id', 'nama')->orderBy('nama')->get();
        $brankasEntry = (object) ['id' => 0, 'nama' => 'Brankas'];
        $semuaNampanCollection = $semuaNampan->prepend($brankasEntry);

        $offset = ($page - 1) * $perPage;
        $itemsForCurrentPage = $semuaNampanCollection->slice($offset, $perPage);

        return new LengthAwarePaginator(
            $itemsForCurrentPage,
            $semuaNampanCollection->count(),
            $perPage,
            $page,
            ['path' => request()->url(), 'query' => request()->query()]
        );
    }

    public function mapProductsWithSalesData($paginatedData, Collection $salesData): Collection
    {
        return $paginatedData->getCollection()->map(function ($item) use ($salesData) {
            if ($salesData->has($item->id)) {
                $dataTerjual = $salesData->get($item->id);
                return [
                    'nama_produk' => $item->nama,
                    'jumlah_item_terjual' => (int) $dataTerjual->jumlah_item_terjual,
                    'berat_terjual' => $this->formatWeight($dataTerjual->berat_terjual),
                    'pendapatan' => $this->formatCurrency($dataTerjual->pendapatan),
                ];
            }

            return [
                'nama_produk' => $item->nama,
                'jumlah_item_terjual' => self::DEFAULT_DISPLAY,
                'berat_terjual' => self::DEFAULT_DISPLAY,
                'pendapatan' => self::DEFAULT_DISPLAY,
            ];
        });
    }

    public function mapNampanWithSalesData($paginatedData, Collection $salesData): Collection
    {
        return $paginatedData->getCollection()->map(function ($item) use ($salesData) {
            if ($salesData->has($item->id)) {
                $dataTerjual = $salesData->get($item->id);
                return [
                    'nama_nampan' => $item->nama,
                    'jumlah_item_terjual' => (int) $dataTerjual->jumlah_item_terjual,
                    'berat_terjual' => $this->formatWeight($dataTerjual->berat_terjual),
                    'pendapatan' => $this->formatCurrency($dataTerjual->pendapatan),
                ];
            }

            return [
                'nama_nampan' => $item->nama,
                'jumlah_item_terjual' => self::DEFAULT_DISPLAY,
                'berat_terjual' => self::DEFAULT_DISPLAY,
                'pendapatan' => self::DEFAULT_DISPLAY,
            ];
        });
    }

    public function buildProdukFilterInfo(Carbon $carbonDate, array $params): array
    {
        $filterInfo = [
            'tanggal' => $carbonDate->isoFormat('dddd, D MMMM Y'),
            'nama_sales' => null,
            'nampan' => null,
            'nama_pembeli' => $params['nama_pembeli'] ?? null,
        ];

        if (!empty($params['sales_id'])) {
            $sales = Sales::find($params['sales_id']);
            $filterInfo['nama_sales'] = $sales?->nama;
        }

        if (isset($params['nampan_id'])) {
            if ($params['nampan_id'] == 0) {
                $filterInfo['nampan'] = 'Brankas';
            } else {
                $nampan = Nampan::find($params['nampan_id']);
                $filterInfo['nampan'] = $nampan?->nama;
            }
        }

        return $filterInfo;
    }

    public function buildNampanFilterInfo(Carbon $carbonDate, array $params): array
    {
        $filterInfo = [
            'tanggal' => $carbonDate->isoFormat('dddd, D MMMM Y'),
            'nama_sales' => null,
            'produk' => null,
            'nama_pembeli' => $params['nama_pembeli'] ?? null,
        ];

        if (!empty($params['sales_id'])) {
            $sales = Sales::find($params['sales_id']);
            $filterInfo['nama_sales'] = $sales?->nama;
        }

        if (!empty($params['produk_id'])) {
            $produk = Produk::find($params['produk_id']);
            $filterInfo['produk'] = $produk?->nama;
        }

        return $filterInfo;
    }

    public function buildPaginationInfo($paginatedData): array
    {
        return [
            'current_page' => $paginatedData->currentPage(),
            'last_page' => $paginatedData->lastPage(),
            'per_page' => $paginatedData->perPage(),
            'total' => $paginatedData->total(),
            'from' => $paginatedData->firstItem(),
            'to' => $paginatedData->lastItem(),
        ];
    }

    public 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,
        ];
    }

    public function defaultSalesData(string $namaSales): array
    {
        return [
            'nama' => $namaSales,
            'item_terjual' => 0,
            'berat_terjual_raw' => 0,
            'pendapatan_raw' => 0,
        ];
    }

    public function formatSalesDataValues(Collection $salesData): Collection
    {
        return $salesData->map(function ($sale) {
            $sale['item_terjual'] = $sale['item_terjual'] > 0 ? $sale['item_terjual'] : self::DEFAULT_DISPLAY;
            $sale['berat_terjual'] = $sale['berat_terjual_raw'] > 0 ? 
                $this->formatWeight($sale['berat_terjual_raw']) : self::DEFAULT_DISPLAY;
            $sale['pendapatan'] = $sale['pendapatan_raw'] > 0 ? 
                $this->formatCurrency($sale['pendapatan_raw']) : self::DEFAULT_DISPLAY;

            unset($sale['berat_terjual_raw'], $sale['pendapatan_raw']);
            return $sale;
        });
    }

    public function formatCurrency(float $amount): string
    {
        return self::CURRENCY_SYMBOL . number_format($amount, 2, ',', '.');
    }

    public function formatWeight(float $weight): string
    {
        return number_format($weight, 2, ',', '.') . self::WEIGHT_UNIT;
    }
}