pds/app/Exports/DayPlanSampleExport.php

<?php

namespace App\Exports;

use App\Models\ProductionPlan;
use App\Models\Plant;
use Carbon\Carbon;
use Maatwebsite\Excel\Concerns\FromArray;

class DayPlanSampleExport implements FromArray
{
    protected $plantId;
    protected $lineId;
    protected $year;
    protected $month;
    protected $week;

    public function __construct($plantId, $lineId, $year, $month, $week)
    {
        $this->plantId = $plantId;
        $this->lineId = $lineId;
        $this->year = $year;
        $this->month = $month;
        $this->week = strtolower($week);
    }

    public function array(): array
    {
        $weekMapping = [
            'week_1' => 1,
            'week_2' => 8,
            'week_3' => 15,
            'week_4' => 22,
            'week_5' => 29,
        ];

        $daysInMonth = Carbon::create(
            $this->year,
            $this->month,
            1
        )->daysInMonth;

        if ($this->week === 'all_weeks') {

            $startDay = 1;
            $maxDays = $daysInMonth;

        } else {

            if (!isset($weekMapping[$this->week])) {
                throw new \Exception('Please select a valid week.');
            }

            $startDay = $weekMapping[$this->week];

            $daysInMonth = Carbon::create(
                $this->year,
                $this->month,
                1
            )->daysInMonth;

            $maxDays = min(7, $daysInMonth - $startDay + 1);

            if ($maxDays <= 0) {
                throw new \Exception('Selected week has no dates in this month.');
            }
        }

        // Plant Code
        $plant = Plant::find($this->plantId);

        if (!$plant) {
            throw new \Exception('Plant not found.');
        }

        // Excel headings
        $headings = [
            'Plant Code',
            'Item Code',
        ];

        $selectedDates = [];

        for ($i = 0; $i < $maxDays; $i++) {

            $day = $startDay + $i;

            $date = Carbon::create(
                $this->year,
                $this->month,
                $day
            );

            $selectedDates[] = $date->format('Y-m-d');

            $headings[] = $date->format('d-m-Y');
        }

        // Existing monthly production plans
        $plans = ProductionPlan::where('plant_id', $this->plantId)
            ->where('line_id', $this->lineId)
            ->whereMonth('created_at', $this->month)
            ->whereYear('created_at', $this->year)
            ->with('item')
            ->get();

        $excelRows = [];

        foreach ($plans as $plan) {

            $itemCode = $plan->item->code ?? '';

            // Get leave dates
            $leaveDates = $plan->leave_dates ?? [];

            if (is_string($leaveDates)) {
                $leaveDates = explode(',', $leaveDates);
            }

            $leaveDates = collect($leaveDates)
                ->map(fn ($date) => trim($date))
                ->filter()
                ->map(fn ($date) => Carbon::parse($date)->format('Y-m-d'))
                ->toArray();

            $row = [
                $plant->code,
                $itemCode,
            ];

            foreach ($selectedDates as $date) {

                // Leave date quantity is 0
                if (in_array($date, $leaveDates)) {
                    $row[] = 0;
                } else {
                    // Sample default quantity
                    $row[] = 0;
                }
            }

            $excelRows[] = $row;
        }

        return array_merge(
            [$headings],
            $excelRows
        );
    }
}