<?php

namespace App\Services;

use App\Models\ItemTransaksi;
use App\Models\Produk;
use App\Models\Transaksi;
use App\Models\Sales;
use App\Models\Nampan;
use App\Repositories\TransaksiRepository;
use App\Helpers\LaporanHelper;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Cache;
use Maatwebsite\Excel\Facades\Excel;
use Barryvdh\DomPDF\Facade\Pdf;
use App\Exports\RingkasanExport;
use App\Exports\DetailProdukExport;
use App\Exports\DetailNampanExport;

class LaporanService
{
    private const CACHE_TTL = 300; // 5 menit
    private const DEFAULT_PER_PAGE = 15;
    private const MAX_PER_PAGE = 100;
    private const DAILY_PER_PAGE = 7;
    private const MONTHLY_PER_PAGE = 12;
    private const PAGINATION_DAYS_LIMIT = 365;

    private TransaksiRepository $transaksiRepo;
    private LaporanHelper $helper;

    public function __construct(TransaksiRepository $transaksiRepo, LaporanHelper $helper)
    {
        $this->transaksiRepo = $transaksiRepo;
        $this->helper = $helper;
    }

    public function getRingkasan(string $filter, int $page)
    {
        $cacheKey = "laporan_ringkasan_{$filter}_page_{$page}";
        
        return Cache::remember($cacheKey, self::CACHE_TTL, function () use ($filter, $page) {
            $allSalesNames = $this->getAllSalesNames();

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

    public function getDetailPerProduk(array $params)
    {
        $tanggal = Carbon::parse($params['tanggal']);
        $page = $params['page'] ?? 1;
        $perPage = $params['per_page'] ?? self::DEFAULT_PER_PAGE;

        // Validasi nampan_id jika ada
        if (isset($params['nampan_id']) && $params['nampan_id'] != 0) {
            if (!Nampan::where('id', $params['nampan_id'])->exists()) {
                throw new \Exception('Nampan tidak ditemukan');
            }
        }

        $produkTerjualQuery = $this->buildBaseItemQuery($tanggal);
        $this->applyFilters($produkTerjualQuery, $params);

        $produkTerjual = $produkTerjualQuery
            ->select(
                'produks.id as id_produk',
                'produks.nama as nama_produk',
                DB::raw('COUNT(item_transaksis.id) as jumlah_item_terjual'),
                DB::raw('COALESCE(SUM(produks.berat), 0) as berat_terjual'),
                DB::raw('COALESCE(SUM(item_transaksis.harga_deal), 0) as pendapatan')
            )
            ->groupBy('produks.id', 'produks.nama')
            ->get()
            ->keyBy('id_produk');

        $totals = $this->helper->calculateTotals($produkTerjual);
        $semuaProdukPaginated = Produk::select('id', 'nama')
            ->orderBy('nama')
            ->paginate($perPage, ['*'], 'page', $page);
        
        $detailItem = $this->helper->mapProductsWithSalesData($semuaProdukPaginated, $produkTerjual);
        $filterInfo = $this->helper->buildProdukFilterInfo($tanggal, $params);

        return [
            'filter' => $filterInfo,
            'rekap_harian' => $totals,
            'produk' => $detailItem->values(),
            'pagination' => $this->helper->buildPaginationInfo($semuaProdukPaginated),
        ];
    }

    public function getDetailPerNampan(array $params)
    {
        $tanggal = Carbon::parse($params['tanggal']);
        $page = $params['page'] ?? 1;
        $perPage = $params['per_page'] ?? self::DEFAULT_PER_PAGE;

        $nampanTerjualQuery = $this->buildBaseItemQuery($tanggal);
        $this->applyNampanFilters($nampanTerjualQuery, $params);

        $nampanTerjual = $nampanTerjualQuery
            ->leftJoin('nampans', 'items.id_nampan', '=', 'nampans.id')
            ->select(
                DB::raw('COALESCE(items.id_nampan, 0) as id_nampan'),
                DB::raw('COALESCE(nampans.nama, "Brankas") as nama_nampan'),
                DB::raw('COUNT(item_transaksis.id) as jumlah_item_terjual'),
                DB::raw('COALESCE(SUM(produks.berat), 0) as berat_terjual'),
                DB::raw('COALESCE(SUM(item_transaksis.harga_deal), 0) as pendapatan')
            )
            ->groupBy('id_nampan', 'nama_nampan')
            ->get()
            ->keyBy('id_nampan');

        $totals = $this->helper->calculateTotals($nampanTerjual);
        $semuaNampanPaginated = $this->helper->getAllNampanWithPagination($page, $perPage);
        $detailItem = $this->helper->mapNampanWithSalesData($semuaNampanPaginated, $nampanTerjual);
        $filterInfo = $this->helper->buildNampanFilterInfo($tanggal, $params);

        return [
            'filter' => $filterInfo,
            'rekap_harian' => $totals,
            'nampan' => $detailItem->values(),
            'pagination' => $this->helper->buildPaginationInfo($semuaNampanPaginated),
        ];
    }

    public function exportRingkasan(array $params)
    {
        $filter = $params['filter'];
        $format = $params['format'];
        $page = $params['page'] ?? 1;
        
        $allSalesNames = $this->getAllSalesNames();
        
        if ($filter === 'hari') {
             // Tar kalau mau ubah eksport laporan setiap hari, param ke-3 jadiin false #Bagas
            $data = $this->processLaporanHarian($allSalesNames, $page, true);
        } else {
            $data = $this->processLaporanBulanan($allSalesNames, $page, true);
        }

        $fileName = "laporan_ringkasan_{$filter}_" . Carbon::now()->format('Ymd') . ".{$format}";

        if ($format === 'pdf') {
            $viewData = method_exists($data, 'items') ? $data->items() : $data;

            $pdf = PDF::loadView('exports.ringkasan_pdf', [
                'data' => $viewData,
                'filter' => $filter
            ]);
            $pdf->setPaper('a4', 'landscape');
            return $pdf->download($fileName);
        }

        return Excel::download(new RingkasanExport($data, $page), $fileName);
    }

    private function getAllSalesNames(): Collection
    {
        return Cache::remember('all_sales_names', self::CACHE_TTL, function () {
            return Transaksi::select('nama_sales')->distinct()->pluck('nama_sales');
        });
    }

    private function processLaporanHarian(Collection $allSalesNames, int $page = 1, bool $limitPagination = true)
    {
        return $this->transaksiRepo->processLaporanHarian($allSalesNames, $page, $limitPagination);
    }

    private function processLaporanBulanan(Collection $allSalesNames, int $page = 1, bool $limitPagination = true)
    {
        return $this->transaksiRepo->processLaporanBulanan($allSalesNames, $page, $limitPagination);
    }

    private function buildBaseItemQuery(Carbon $carbonDate)
    {
        return ItemTransaksi::query()
            ->join('items', 'item_transaksis.id_item', '=', 'items.id')
            ->join('produks', 'items.id_produk', '=', 'produks.id')
            ->join('transaksis', 'item_transaksis.id_transaksi', '=', 'transaksis.id')
            ->whereDate('transaksis.created_at', $carbonDate);
    }

    private function applyFilters($query, array $params): void
    {
        if (!empty($params['sales_id'])) {
            $query->join('sales', 'transaksis.id_sales', '=', 'sales.id')
                ->where('sales.id', $params['sales_id']);
        }

        if (isset($params['nampan_id'])) {
            if ($params['nampan_id'] == 0) {
                $query->whereNull('items.id_nampan');
            } else {
                $query->where('items.id_nampan', $params['nampan_id']);
            }
        }

        if (!empty($params['nama_pembeli'])) {
            $query->where('transaksis.nama_pembeli', 'like', "%{$params['nama_pembeli']}%");
        }
    }

    private function applyNampanFilters($query, array $params): void
    {
        if (!empty($params['sales_id'])) {
            $query->join('sales', 'transaksis.id_sales', '=', 'sales.id')
                ->where('sales.id', $params['sales_id']);
        }

        if (!empty($params['produk_id'])) {
            $query->where('produks.id', $params['produk_id']);
        }

        if (!empty($params['nama_pembeli'])) {
            $query->where('transaksis.nama_pembeli', 'like', "%{$params['nama_pembeli']}%");
        }
    }
}