pds/app/Filament/Widgets/ProductionLineStopChart.php

<?php

namespace App\Filament\Widgets;

use Filament\Widgets\ChartWidget;

class ProductionLineStopChart extends ChartWidget
{
    protected static ?string $heading = 'Production Line Stop Chart';

    protected static ?string $maxHeight = '250px';

    protected function getData(): array
    {
        $activeFilter = $this->filter;
        $selectedPlant = session('selected_plant');
        $selectedLine = session('selected_line');

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

        // Set time range based on active filter
        if ($activeFilter === 'yesterday') {
            $startDate = now()->subDay()->setTime(8, 0, 0);
            $endDate = now()->setTime(8, 0, 0);
        } elseif ($activeFilter === 'this_week') {
            $startDate = now()->startOfWeek()->setTime(8, 0, 0);
            $endDate = now()->endOfWeek()->addDay()->setTime(8, 0, 0);
        } elseif ($activeFilter === 'this_month') {
            $startDate = now()->startOfMonth();
            $endDate = now()->endOfMonth();
        } else {
            $startDate = now()->setTime(8, 0, 0);
            $endDate = now()->copy()->addDay()->setTime(8, 0, 0);
        }

        // Fetch stop reason data
       // treats minutes as a visual decimal (e.g., 15 mins = 0.15)
        $query = \DB::table('production_line_stops')
        ->join('line_stops as ls', 'production_line_stops.linestop_id', '=', 'ls.id')
        ->join('lines', 'production_line_stops.line_id', '=', 'lines.id')
        ->join('plants', 'production_line_stops.plant_id', '=', 'plants.id')
        ->select(
            'ls.code',
            'ls.reason',
                        \DB::raw("
                SUM(production_line_stops.stop_hour) as total_stop_hours,
                SUM(production_line_stops.stop_min) as total_stop_minutes
            ")
          )
        ->when($selectedPlant, fn($q) => $q->where('plants.id', $selectedPlant))
        ->when($selectedLine, fn($q) => $q->where('lines.id', $selectedLine))
        ->whereBetween('production_line_stops.created_at', [$startDate, $endDate])
        ->groupBy('ls.code', 'ls.reason')
        //->orderByDesc('total_hours')
        ->get();

        // Handle empty data gracefully
        if ($query->isEmpty()) {
            return [
                'datasets' => [[
                    'label' => 'Line Stop Reasons',
                    'data' => [1],
                    'backgroundColor' => ['rgba(200, 200, 200, 0.4)'],
                    'borderColor' => ['rgba(200, 200, 200, 1)'],
                    'borderWidth' => 1,
                ]],
                'labels' => ['No Data'],
            ];
        }

        $labels = [];
        $data = [];
        $backgroundColors = [];
        $borderColors = [];

        function generateColor(string $key, float $opacity): string {
            // Use a stable hash of the key, no randomness
            $hash = md5($key);

            // Get the RGB components from the hash
            $r = hexdec(substr($hash, 0, 2)); // Red component
            $g = hexdec(substr($hash, 2, 2)); // Green component
            $b = hexdec(substr($hash, 4, 2)); // Blue component

            // Avoid deep green colors for the `code`
            if ($g > 150 && $g < 255) {
                // Adjust green component if it's in the deep green range
                $g = 150; // Assign a fixed, safe value for green
            }

            // Return the color as rgba with the specified opacity
            return "rgba($r, $g, $b, $opacity)";
        }

        $totalStopMinutes = 0;

        foreach ($query as $row) {
            $code = $row->code;
            $reason = $row->reason;

            $stopHours = $row->total_stop_hours;
            $stopMinutes = $row->total_stop_minutes;
            $visualTotal = $stopHours + ($stopMinutes / 100);

            $codeLabel = "$code - $reason";
            $labels[] = $codeLabel;
            $data[] = $visualTotal;
            $backgroundColors[] = generateColor($code, 0.7); // Unique color for each stop code
            $borderColors[] = generateColor($code, 1.0);

            // Accumulate total stop time (in minutes)
            $totalStopMinutes += ($stopHours * 60) + $stopMinutes;
        }

        // Calculate remaining time (1440 minutes = 24 hours)
        $remainingMinutes = 1440 - $totalStopMinutes;
        $runtimeHours = floor($remainingMinutes / 60);
        $runtimeMinutes = $remainingMinutes % 60;
        $runtimeVisual = $runtimeHours + ($runtimeMinutes / 100);

        // Add runtime slice with green color (either light or dark green)
        $labels[] = 'Available Runtime';
        $data[] = $runtimeVisual;
        $backgroundColors[] = 'rgba(47, 218, 47, 0.94)'; // Green for runtime
        $borderColors[] = 'rgba(75, 192, 75, 1)';

        return [
            'datasets' => [[
                'label' => 'Line Stop Durations (hrs)',
                'data' => $data,
                'backgroundColor' => $backgroundColors,
                'borderColor' => $borderColors,
                'borderWidth' => 1,
            ]],
            'labels' => $labels,
        ];
    }

    protected function getType(): string
    {
        return 'pie';
    }

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

    protected function getOptions(): array
    {
        return [
            // 'responsive' => true,
            // 'plugins' => [
            //     'legend' => [
            //         'position' => 'bottom',
            //     ],
            //     'tooltip' => [
            //         'enabled' => true, // Tooltips enabled on hover
            //     ],
            // ],
              'plugins' => [
                'datalabels' => false,
            ],
            'scales' => [
                'x' => [
                    'display' => false, // Disable x-axis
                ],
                'y' => [
                    'display' => false, // Disable y-axis
                ],
            ],
        ];
    }

    public static function canView(): bool
    {
        // Only show on HourlyProduction page
        return request()->routeIs('filament.pages.production-line-stop-count');
    }
}