<?php

namespace App\Filament\Widgets;

use App\Models\InvoiceValidation;
use App\Models\Line;
use App\Models\Plant;
use Filament\Widgets\ChartWidget;

class InvoiceChart extends ChartWidget
{
    protected static ?string $heading = 'Chart';

    protected int|string|array $columnSpan = 12;

    protected $listeners = ['invoiceChart'];

    protected function getData(): array
    {
        $selectedPlant =session('selec_plant');

        $selectedInvoice = session('select_invoice');

        $activeFilter = $this->filter;

        if (!$selectedPlant || !$selectedInvoice) {
            return
            [
                'datasets' => [],
                'labels' => [],
            ];
        }

        if ($activeFilter === 'yesterday') {
            $startDate = now()->subDay()->setTime(8, 0, 0); // yesterday 8:00 AM
            $endDate = now()->setTime(8, 0, 0);              // today 8:00 AM
            $groupBy = 'EXTRACT(HOUR FROM invoice_validations.created_at)';
        }
        else if ($activeFilter === 'this_week') {
            // Monday 8:00 AM of the current week
            $startDate = now()->startOfWeek()->setTime(8, 0, 0);

            // Next Monday 8:00 AM (end of Sunday + 8 hrs)
            $endDate = now()->endOfWeek()->addDay()->setTime(8, 0, 0);

            $groupBy = 'EXTRACT(DOW FROM invoice_validations.created_at)'; // Group by day of week
        }
        else if ($activeFilter === 'this_month') {
            $startDate = now()->startOfMonth();
            $endDate = now()->endOfMonth();
            $groupBy = "FLOOR((EXTRACT(DAY FROM invoice_validations.created_at) - 1) / 7) + 1";
        }
        else
        {
            $startDate = now()->setTime(8, 0, 0); // today at 8:00 AM
            $endDate = now()->copy()->addDay()->setTime(8, 0, 0); // tomorrow at 8:00 AM
            $groupBy = 'EXTRACT(HOUR FROM invoice_validations.created_at)';
        }

        // $fullyScannedInvoiceNumbers = \DB::table('invoice_validations')
        // ->select('invoice_number')
        // ->where('plant_id', $selectedPlant)
        // ->groupBy('invoice_number')
        // ->havingRaw("SUM(CASE WHEN scanned_status = 'Scanned' THEN 1 ELSE 0 END) = COUNT(*)")
        // ->pluck('invoice_number');

        if ($selectedInvoice === 'individual_material')
        {
            $fullyScannedInvoiceNumbers = \DB::table('invoice_validations')
                ->select('invoice_number')
                ->where('plant_id', $selectedPlant)
                ->havingRaw('MIN(quantity) = 1 AND MAX(quantity) = 1') // All rows must have quantity = 1
                ->groupBy('invoice_number')
                ->havingRaw("SUM(CASE WHEN serial_number IS NOT NULL AND serial_number != '' THEN 1 ELSE 0 END) = COUNT(*)")
                ->pluck('invoice_number');
        }
        else if ($selectedInvoice === 'bundle_material')
        {
            $fullyScannedInvoiceNumbers = \DB::table('invoice_validations')
                ->select('invoice_number')
                ->where('plant_id', $selectedPlant)
                ->havingRaw('MIN(quantity) > 1')
                ->groupBy('invoice_number')
                ->havingRaw("SUM(CASE WHEN serial_number IS NOT NULL AND serial_number != '' THEN 1 ELSE 0 END) = COUNT(*)")
                ->pluck('invoice_number');
        }
        else
        {
            $fullyScannedInvoiceNumbers = \DB::table('invoice_validations')
                ->select('invoice_number')
                ->where('plant_id', $selectedPlant)
                ->groupBy('invoice_number')
                ->havingRaw("SUM(CASE WHEN scanned_status = 'Scanned' THEN 1 ELSE 0 END) = COUNT(*)")
                ->pluck('invoice_number');
        }


        //query data
        $query = \DB::table('invoice_validations')
        ->join('plants', 'invoice_validations.plant_id', '=', 'plants.id')
        ->selectRaw("$groupBy AS time_unit, count(distinct invoice_validations.invoice_number) AS total_quantity")
        ->whereBetween('invoice_validations.created_at', [$startDate, $endDate])
        ->where('invoice_validations.plant_id', $selectedPlant)
        ->whereIn('invoice_validations.invoice_number', $fullyScannedInvoiceNumbers)
        ->when($selectedInvoice === 'serial_invoice', fn($q) =>
            $q->whereNotNull('invoice_validations.serial_number')
              ->where('invoice_validations.serial_number', '!=', '')
        )
        ->when($selectedInvoice === 'individual_material', fn($q) =>
            $q->where('invoice_validations.quantity', 1) // Only individual items
        )
        ->when($selectedInvoice === 'bundle_material', fn($q) =>
            $q->where('invoice_validations.quantity', '>', 1) // Assume bundles have quantity > 1
        )
        ->groupByRaw($groupBy)
        ->orderByRaw($groupBy)
        ->pluck('total_quantity', 'time_unit')
        ->toArray();
        if ($activeFilter === 'this_month') {
            $weeksCount = ceil($endDate->day / 7); // Calculate total weeks dynamically
            $allWeeks = array_fill(1, $weeksCount, 0); // Initialize all weeks with 0
            $data = array_replace($allWeeks, $query);  // Fill missing weeks with 0

            // Generate dynamic week labels
            $labels = [];
            for ($i = 1; $i <= $weeksCount; $i++) {
                $weekStart = $startDate->copy()->addDays(($i - 1) * 7)->format('d M');
                $weekEnd = $startDate->copy()->addDays($i * 7 - 1)->min($endDate)->format('d M');
                $labels[] = "Week $i ($weekStart - $weekEnd)";
            }

            $orderedData = array_values($data);
        }
        else if ($activeFilter === 'this_week') {
            // Correct week labels: ['Mon', 'Tue', ..., 'Sun']
            $labels = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'];

            // Initialize default data for all 7 days
            $data = array_fill(0, 7, 0);

            // Fill in data from query results
            foreach ($query as $dow => $count) {
                $data[$dow] = $count;
            }

            // Ensure days are ordered from Monday to Sunday
            $orderedData = [
                $data[1] ?? 0, // Monday
                $data[2] ?? 0, // Tuesday
                $data[3] ?? 0, // Wednesday
                $data[4] ?? 0, // Thursday
                $data[5] ?? 0, // Friday
                $data[6] ?? 0, // Saturday
                $data[0] ?? 0, // Sunday (move to last)
            ];
        }
        else
        {
        // Hourly data (same as before)
        $allHours = array_fill(0, 24, 0);
        $data = array_replace($allHours, $query);

        // Shift hours for proper display (8 AM to 7 AM)
        $shiftedKeys = array_merge(range(8, 23), range(0, 8));
        $orderedData = array_map(fn($hour) => $data[$hour], $shiftedKeys);

        // Labels: ["8 AM", "9 AM", ..., "7 AM"]
        $labels = array_map(fn ($hour) => date("g A", strtotime("$hour:00")), $shiftedKeys);
    }
        return [
            'datasets' => [
                [
                    'label' => match ($activeFilter) {
                        'this_week' => "Daily imported excel file count",
                        'this_month' => "Weekly imported excel file count", // Updated Label
                        'yesterday' => "Yesterday's imported excel file count",
                        default => "Today's imported excel file count",
                    },
                    'data' => $orderedData,
                    'borderColor' => 'rgba(75, 192, 192, 1)',
                    'backgroundColor' => 'rgba(75, 192, 192, 0.2)',
                    'fill' => false,
                    'tension' => 0.3,
                ],
            ],
            'labels' => $labels,
        ];
    }

    protected function getType(): string
    {
        return 'bar';
    }
    public static function getDefaultName(): string
    {
        return 'invoice-chart';
    }

    protected function getOptions(): array
    {
        return [
            'scales' => [
                'y' => [
                    'beginAtZero' => true, //Start Y-axis from 0
                    'ticks' => [
                        'stepSize' => 1,
                    ],
                ],
            ],
        ];
    }

    protected function getFilters(): ?array
    {
        return [
            'today' => 'Today',
            'yesterday' => 'Yesterday',
            'this_week'=> 'This Week',
            'this_month'=> 'This Month',
        ];
    }

    public static function canView(): bool
    {
      //  dd('Checking route:', request()->route()->getName());
        // to avoid showing the widget in other pages
        return request()->routeIs('filament.admin.pages.invoice-dashboard');
    }

}