<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

/**
 * One component, one day, counted.
 *
 * The row holds sample counts rather than a percentage. A percentage would
 * have to be recomputed and rewritten on every sample, and the first rounding
 * decision taken during the day becomes a permanent part of the record.
 *
 * A day with no row is a day nobody measured. That is drawn as its own thing —
 * never as an operational day, which is the mistake that makes a status page
 * worthless the moment somebody checks it against their own memory.
 */
class StatusDay extends Model
{
    /** @use HasFactory<\Database\Factories\StatusDayFactory> */
    use HasFactory;

    protected $fillable = ['day', 'component', 'samples', 'operational', 'degraded', 'down', 'unknown'];

    protected function casts(): array
    {
        return ['day' => 'date'];
    }

    /**
     * The share of samples in which the component answered, as a percentage.
     *
     * Degraded counts as up: the service was reachable and doing its job less
     * well, and folding it into downtime would report a slow morning as an
     * outage. It still colours the bar — see the view.
     */
    public function uptimePercent(): ?float
    {
        $measured = $this->samples - $this->unknown;

        if ($measured <= 0) {
            return null;
        }

        return round(($this->operational + $this->degraded) / $measured * 100, 3);
    }

    /** The worst thing seen that day — what the bar is coloured by. */
    public function worst(): string
    {
        return match (true) {
            $this->down > 0 => 'down',
            $this->degraded > 0 => 'degraded',
            $this->operational > 0 => 'operational',
            default => 'unknown',
        };
    }
}