<?php

namespace App\Ingest;

use App\Enums\DueMode;
use App\Models\Event;
use Carbon\CarbonImmutable;

/** Разобранный due_at: tagged union по mode. */
final class ParsedDue
{
    private function __construct(
        public readonly DueMode $mode,
        public readonly ?string $date,
        public readonly ?string $time,
        public readonly ?CarbonImmutable $instant,
    ) {}

    public static function local(string $date, string $time): self
    {
        return new self(DueMode::Local, $date, $time, null);
    }

    public static function fixed(CarbonImmutable $instant): self
    {
        return new self(DueMode::Fixed, null, null, $instant->utc());
    }

    /** Календарный день срока в данном поясе, Y-m-d. */
    public function dayFor(string $tz): string
    {
        return match ($this->mode) {
            DueMode::Local => $this->date,
            DueMode::Fixed => $this->instant->setTimezone($tz)->format('Y-m-d'),
        };
    }

    public function equals(Event $event): bool
    {
        if ($event->due_mode !== $this->mode) {
            return false;
        }

        return match ($this->mode) {
            DueMode::Local => $event->due_date->format('Y-m-d') === $this->date && $event->due_time === $this->time,
            DueMode::Fixed => $event->due_instant->eq($this->instant),
        };
    }

    /** @return array<string, mixed> колонки events */
    public function columns(): array
    {
        return [
            'due_mode' => $this->mode,
            'due_date' => $this->date,
            'due_time' => $this->time,
            'due_instant' => $this->instant,
        ];
    }
}