<?php

namespace Modules\DailySalePaymentReportModule\Http\Controllers;

use Illuminate\Contracts\Support\Renderable;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Illuminate\Support\Facades\DB;
use Carbon\Carbon;

class DailySalePaymentReportModuleController extends Controller
{
    /**
     * Display a listing of the resource.
     * @return Renderable
     */
    public function index(Request $request)
    {
        $report_date = $request->input('report_date', Carbon::today()->toDateString());

        // Fetch dynamic payment options using DB facade since the model is missing in this branch
        $paymentOptions = DB::table('payment_options')->where('is_active', 1)
            ->orderBy('id')
            ->get(['id', 'name']);

        $creditCollections = $this->getCreditSaleCollections($report_date);  
        
        $creditTotals = [
            'grand_total' => $creditCollections->sum('grand_total'),
            'methods' => [],
        ];

        foreach ($paymentOptions as $option) {
            $creditTotals['methods'][$option->id] = $creditCollections->sum(
                fn($row) => $row['methods'][$option->id] ?? 0 
            );
        }


        $sales = DB::table('sales')
            ->leftJoin('users', 'sales.user_id', '=', 'users.id')
            ->leftJoin('customers', 'sales.customer_id', '=', 'customers.id')
            ->whereDate('sales.created_at', $report_date)
            ->select(
                'sales.id',
                'sales.created_at as date',
                'sales.reference_no',
                'users.name as cashier',
                'customers.name as customer',
                'sales.grand_total',
                'sales.due_amount'
            )->get();

        $saleIds = $sales->pluck('id')->all();

        // 1. Get all payments for these sales (avoids N+1 query problem)
        $paymentsTable = DB::table('payments')
            ->whereIn('sale_id', $saleIds)
            ->whereDate('created_at', $report_date)
            ->get(['id', 'sale_id', 'amount', 'payment_option_id']);

        $usedPaymentIds = $paymentsTable->pluck('id')->all();

        // 2. Get additional payments from sales_payments table
        $salesPaymentsTable = DB::table('sales_payments')
            ->whereIn('sale_id', $saleIds)
            ->whereDate('created_at', $report_date)
            ->where(function ($q) use ($usedPaymentIds) {
                $q->whereNull('payment_id');
                if (!empty($usedPaymentIds)) {
                    $q->orWhereNotIn('payment_id', $usedPaymentIds);
                }
            })
            ->get(['id', 'sale_id', 'amount', 'payment_id']);

        $linkedPaymentIds = $salesPaymentsTable->whereNotNull('payment_id')->pluck('payment_id')->unique();

        $linkedOptionMap = DB::table('payments')
            ->whereIn('id', $linkedPaymentIds)
            ->pluck('payment_option_id', 'id');

        $sales_data = [];
        foreach ($sales as $sale) {
            $methodTotals = [];
            
            // Sum from payments table
            foreach ($paymentsTable->where('sale_id', $sale->id) as $p) {
                $optionId = $p->payment_option_id;
                $methodTotals[$optionId] = ($methodTotals[$optionId] ?? 0) + $p->amount;
            }

            // Sum from sales_payments table
            foreach ($salesPaymentsTable->where('sale_id', $sale->id) as $sp) {
                $optionId = $sp->payment_id ? ($linkedOptionMap[$sp->payment_id] ?? null) : null;
                if ($optionId) {
                    $methodTotals[$optionId] = ($methodTotals[$optionId] ?? 0) + $sp->amount;
                }
            }

            $sales_data[] = (object) [
                'date' => Carbon::parse($sale->date)->format('Y-m-d'),
                'reference_no' => $sale->reference_no,
                'cashier' => $sale->cashier ?? 'N/A',
                'customer' => $sale->customer ?? 'N/A',
                'grand_total' => $sale->grand_total,
                'due_amount' => $sale->due_amount,
                'methods' => $methodTotals
            ];
        }

        return view('dailysalepaymentreportmodule::index', compact(
            'sales_data', 
            'report_date', 
            'paymentOptions', 
            'creditCollections',
            'creditTotals',
            ));
    }

    private function getCreditSaleCollections($date)
    {
        $paymentsTable = DB::table('payments')
            ->whereNotNull('sale_id')
            ->whereDate('created_at', $date)
            ->get(['id', 'sale_id', 'amount', 'payment_option_id']);

        $usedPaymentIds = $paymentsTable->pluck('id')->all();

        $salesPaymentsTable = DB::table('sales_payments')
            ->whereDate('created_at', $date)
            ->where(function ($q) use ($usedPaymentIds) {
                $q->whereNull('payment_id');
                if (!empty($usedPaymentIds)) {
                    $q->orWhereNotIn('payment_id', $usedPaymentIds);
                }
            })
            ->get(['id', 'sale_id', 'amount', 'payment', 'payment_id']);

        $linkedPaymentIds = $salesPaymentsTable->whereNotNull('payment_id')->pluck('payment_id')->unique();

        $linkedOptionMap = DB::table('payments')
            ->whereIn('id', $linkedPaymentIds)
            ->pluck('payment_option_id', 'id');

        $saleIds = $paymentsTable->pluck('sale_id')
            ->merge($salesPaymentsTable->pluck('sale_id'))
            ->unique()
            ->values();

        if ($saleIds->isEmpty()) {
            return collect();
        }

        $sales = DB::table('sales')
            ->whereIn('id', $saleIds)
            ->whereDate('created_at', '<', $date)
            ->select('id', 'reference_no', 'user_id', 'customer_id', 'grand_total', 'paid_amount', 'created_at')
            ->get()
            ->keyBy('id');

        if ($sales->isEmpty()) {
            return collect();
        }

        $users = DB::table('users')->whereIn('id', $sales->pluck('user_id')->unique())->pluck('name', 'id');
        $customers = DB::table('customers')->whereIn('id', $sales->pluck('customer_id')->unique())->pluck('name', 'id');

        $rows = [];

        foreach ($sales as $saleId => $sale) {
            $methodTotals = [];

            foreach ($paymentsTable->where('sale_id', $saleId) as $p) {
                $optionId = $p->payment_option_id;
                $methodTotals[$optionId] = ($methodTotals[$optionId] ?? 0) + $p->amount;
            }

            foreach ($salesPaymentsTable->where('sale_id', $saleId) as $sp) {
                $optionId = $sp->payment_id ? ($linkedOptionMap[$sp->payment_id] ?? null) : null;
                if ($optionId) {
                    $methodTotals[$optionId] = ($methodTotals[$optionId] ?? 0) + $sp->amount;
                }
            }

            $rows[] = [
                'date'        => $sale->created_at,
                'reference'   => $sale->reference_no,
                'cashier'     => $users[$sale->user_id] ?? '-',
                'customer'    => $customers[$sale->customer_id] ?? '-',
                'grand_total' => $sale->grand_total - $sale->paid_amount,
                'methods'     => $methodTotals,
            ];
        }

        return collect($rows);
    }

    /**
     * Show the form for creating a new resource.
     * @return Renderable
     */
    public function create()
    {
        return view('dailysalepaymentreportmodule::create');
    }

    /**
     * Store a newly created resource in storage.
     * @param Request $request
     * @return Renderable
     */
    public function store(Request $request)
    {
        //
    }

    /**
     * Show the specified resource.
     * @param int $id
     * @return Renderable
     */
    public function show($id)
    {
        return view('dailysalepaymentreportmodule::show');
    }

    /**
     * Show the form for editing the specified resource.
     * @param int $id
     * @return Renderable
     */
    public function edit($id)
    {
        return view('dailysalepaymentreportmodule::edit');
    }

    /**
     * Update the specified resource in storage.
     * @param Request $request
     * @param int $id
     * @return Renderable
     */
    public function update(Request $request, $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     * @param int $id
     * @return Renderable
     */
    public function destroy($id)
    {
        //
    }

    public function exportReport(Request $request)
    {

        $date = $request->query('date');
        $type = $request->query('type');


        return "Export function is working. Selected Date: " . $date . " | Export Type: " . $type;
    }
}