<?php

namespace Modules\Business\App\Exports;

use App\Models\Transaction;
use App\Traits\DateFilterTrait;
use Illuminate\Contracts\View\View;
use Maatwebsite\Excel\Concerns\FromView;

class ExportCashFlowReport implements FromView
{
    use DateFilterTrait;
    
    public function view(): View
    {
        $query = Transaction::with([
            'paymentType:id,name',
            'sale:id,party_id',
            'sale.party:id,name',
            'saleReturn:id,sale_id',
            'purchase:id,party_id',
            'purchase.party:id,name',
            'purchaseReturn:id,purchase_id',
            'dueCollect:id,party_id',
            'dueCollect.party:id,name',
        ])
            ->where('business_id', auth()->user()->business_id)
            ->whereIn('type', ['debit', 'credit']);

        // Date Filter
        $duration = request('custom_days') ?: 'today';
        $this->applyDateFilter($query, $duration, 'date', request('from_date'), request('to_date'));

        // Search filter
        if (request('search')) {
            $query->where(function ($query) {
                $query->where('date', 'like', '%' . request('search') . '%')
                    ->orWhere('invoice_no', 'like', '%' . request('search') . '%')
                    ->orWhere('platform', 'like', '%' . request('search') . '%')
                    ->orWhere('amount', 'like', '%' . request('search') . '%')
                    ->orWhere('transaction_type', 'like', '%' . request('search') . '%')
                    ->orWhereHas('paymentType', function ($q) {
                        $q->where('name', 'like', '%' . request('search') . '%');
                    });
            });
        }

        // Platform filter
        if (request('platform')) {
            $query->where('platform', request('platform'));
        }

        // Paginate data
        $cash_flows = $query->limit(request('per_page') ?? 20)->get();

        $firstDate = $cash_flows->first()?->date;

        if ($firstDate) {
            $opening_balance = (clone $query)
                ->whereDate('date', '<', $firstDate)
                ->selectRaw("SUM(CASE WHEN type='credit' THEN amount ELSE 0 END) - SUM(CASE WHEN type='debit' THEN amount ELSE 0 END) as balance")
                ->value('balance') ?? 0;
        } else {
            $opening_balance = 0;
        }

        return view('business::cash-flow.excel-csv', compact('cash_flows', 'opening_balance'));
    }
}