Calendar.php

<?php

namespace ICanBoogie\CLDR\Dates;

use ArrayObject;
use DateTimeInterface;
use ICanBoogie\Accessor\AccessorTrait;
use ICanBoogie\CLDR\Core\Locale;
use ICanBoogie\CLDR\General\Transforms\ContextTransforms;

/**
 * Representation of a locale calendar.
 *
 * @property-read DateTimeFormatter $datetime_formatter A datetime formatter.
 * @property-read DateFormatter $date_formatter A date formatter.
 * @property-read TimeFormatter $time_formatter A time formatter.
 *
 * @property-read string[] $standalone_abbreviated_days     Shortcut to `days/stand-alone/abbreviated`.
 * @property-read string[] $standalone_abbreviated_eras     Shortcut to `eras/eraAbbr`.
 * @property-read string[] $standalone_abbreviated_months   Shortcut to `months/stand-alone/abbreviated`.
 * @property-read string[] $standalone_abbreviated_quarters Shortcut to `quarters/stand-alone/abbreviated`.
 * @property-read string[] $standalone_narrow_days          Shortcut to `days/stand-alone/narrow`.
 * @property-read string[] $standalone_narrow_eras          Shortcut to `eras/eraNarrow`.
 * @property-read string[] $standalone_narrow_months        Shortcut to `months/stand-alone/narrow`.
 * @property-read string[] $standalone_narrow_quarters      Shortcut to `quarters/stand-alone/narrow`.
 * @property-read string[] $standalone_short_days           Shortcut to `days/stand-alone/short`.
 * @property-read string[] $standalone_short_eras           Shortcut to `eras/eraAbbr`.
 * @property-read string[] $standalone_short_months         Shortcut to `months/stand-alone/abbreviated`.
 * @property-read string[] $standalone_short_quarters       Shortcut to `quarters/stand-alone/abbreviated`.
 * @property-read string[] $standalone_wide_days            Shortcut to `days/stand-alone/wide`.
 * @property-read string[] $standalone_wide_eras            Shortcut to `eras/eraNames`.
 * @property-read string[] $standalone_wide_months          Shortcut to `months/stand-alone/wide`.
 * @property-read string[] $standalone_wide_quarters        Shortcut to `quarters/stand-alone/wide`.
 * @property-read string[] $abbreviated_days                Shortcut to `days/format/abbreviated`.
 * @property-read string[] $abbreviated_eras                Shortcut to `eras/eraAbbr`.
 * @property-read string[] $abbreviated_months              Shortcut to `months/format/abbreviated`.
 * @property-read string[] $abbreviated_quarters            Shortcut to `quarters/format/abbreviated`.
 * @property-read string[] $narrow_days                     Shortcut to `days/format/narrow`.
 * @property-read string[] $narrow_eras                     Shortcut to `eras/eraNarrow`.
 * @property-read string[] $narrow_months                   Shortcut to `months/format/narrow`.
 * @property-read string[] $narrow_quarters                 Shortcut to `quarters/format/narrow`.
 * @property-read string[] $short_days                      Shortcut to `days/format/short`.
 * @property-read string[] $short_eras                      Shortcut to `eras/eraAbbr`.
 * @property-read string[] $short_months                    Shortcut to `months/format/abbreviated`.
 * @property-read string[] $short_quarters                  Shortcut to `quarters/format/abbreviated`.
 * @property-read string[] $wide_days                       Shortcut to `days/format/wide`.
 * @property-read string[] $wide_eras                       Shortcut to `eras/eraNames`.
 * @property-read string[] $wide_months                     Shortcut to `months/format/wide`.
 * @property-read string[] $wide_quarters                   Shortcut to `quarters/format/wide`.
 *
 * @extends ArrayObject<string, mixed>
 */
final class Calendar extends ArrayObject
{
    /**
     * @uses get_datetime_formatter
     * @uses get_date_formatter
     * @uses get_time_formatter
     */
    use AccessorTrait;

    public const SHORTHANDS_REGEX = '#^(standalone_)?(abbreviated|narrow|short|wide)_(days|eras|months|quarters)$#';

    public const WIDTH_ABBR = 'abbreviated';
    public const WIDTH_NARROW = 'narrow';
    public const WIDTH_SHORT = 'short';
    public const WIDTH_WIDE = 'wide';

    public const ERA_NAMES = 'eraNames';
    public const ERA_ABBR = 'eraAbbr';
    public const ERA_NARROW = 'eraNarrow';

    public const CALENDAR_MONTHS = 'months';
    public const CALENDAR_DAYS = 'days';
    public const CALENDAR_QUARTERS = 'quarters';
    public const CALENDAR_ERAS = 'eras';

    public const CONTEXT_FORMAT = 'format';
    public const CONTEXT_STAND_ALONE = 'stand-alone';

    /**
     * @var array<string, string>
     */
    private static array $era_widths_mapping = [

        self::WIDTH_ABBR => self::ERA_ABBR,
        self::WIDTH_NARROW => self::ERA_NARROW,
        self::WIDTH_SHORT => self::ERA_ABBR,
        self::WIDTH_WIDE => self::ERA_NAMES

    ];

    private DateTimeFormatter $datetime_formatter;

    private function get_datetime_formatter(): DateTimeFormatter
    {
        return $this->datetime_formatter ??= new DateTimeFormatter($this);
    }

    private DateFormatter $date_formatter;

    private function get_date_formatter(): DateFormatter
    {
        return $this->date_formatter ??= new DateFormatter($this);
    }

    private TimeFormatter $time_formatter;

    private function get_time_formatter(): TimeFormatter
    {
        return $this->time_formatter ??= new TimeFormatter($this);
    }

    private readonly ContextTransforms $context_transforms;

    /**
     * @param array<string, mixed> $data
     */
    public function __construct(
        public readonly Locale $locale,
        array $data
    ) {
        $this->context_transforms = $locale->context_transforms;

        $data = $this->transform_data($data);

        parent::__construct($data);
    }

    /**
     * @phpstan-ignore-next-line
     */
    private array $shortcuts = [];

    /**
     * @return mixed
     */
    public function __get(string $property)
    {
        if (!preg_match(self::SHORTHANDS_REGEX, $property, $matches)) {
            return $this->accessor_get($property);
        }

        $make = function () use ($matches) {
            [ , $standalone, $width, $type ] = $matches;

            $data = $this[$type];

            if ($type === self::CALENDAR_ERAS) {
                return $data[self::$era_widths_mapping[$width]];
            }

            $data = $data[$standalone ? self::CONTEXT_STAND_ALONE : self::CONTEXT_FORMAT];

            if ($width === self::WIDTH_SHORT && empty($data[$width])) {
                $width = self::WIDTH_ABBR;
            }

            return $data[$width];
        };

        return $this->shortcuts[$property] ??= $make();
    }

    /**
     * @see DateTimeFormatter::format
     */
    public function format_datetime(
        DateTimeInterface|int|string $datetime,
        string|DateTimeFormatLength $pattern_or_length_or_skeleton
    ): string {
        return $this->get_datetime_formatter()->format($datetime, $pattern_or_length_or_skeleton);
    }

    /**
     * @see DateFormatter::format
     */
    public function format_date(
        DateTimeInterface|int|string $datetime,
        string|DateTimeFormatLength $pattern_or_length_or_skeleton
    ): string {
        return $this->get_date_formatter()->format($datetime, $pattern_or_length_or_skeleton);
    }

    /**
     * @see TimeFormatter::format
     */
    public function format_time(
        DateTimeInterface|int|string $datetime,
        string|DateTimeFormatLength $pattern_or_length_or_skeleton
    ): string {
        return $this->get_time_formatter()->format($datetime, $pattern_or_length_or_skeleton);
    }

    /**
     * Transforms calendar data according to context transforms rules.
     *
     * @param array<string, mixed> $data
     *
     * @return array<string, mixed>
     *
     * @uses transform_months
     * @uses transform_days
     * @uses transform_quarters
     */
    private function transform_data(array $data): array
    {
        static $transformable = [

            self::CALENDAR_MONTHS,
            self::CALENDAR_DAYS,
            self::CALENDAR_QUARTERS

        ];

        foreach ($transformable as $name) {
            array_walk($data[$name], function (array &$data, string $context) use ($name): void {
                $is_stand_alone = self::CONTEXT_STAND_ALONE === $context;

                array_walk($data, function (array &$names, string $width) use ($name, $is_stand_alone): void {
                    $names = $this->{'transform_' . $name}($names, $width, $is_stand_alone);
                });
            });
        }

        if (isset($data[self::CALENDAR_ERAS])) {
            array_walk($data[self::CALENDAR_ERAS], function (array &$names, string $width): void {
                $names = $this->transform_eras($names, $width);
            });
        }

        return $data;
    }

    /**
     * Transforms month names according to context transforms rules.
     *
     * @param string[] $names
     *
     * @return string[]
     */
    private function transform_months(array $names, string $width, bool $standalone): array
    {
        return $this->transform_months_or_days(
            $names,
            $width,
            $standalone,
            ContextTransforms::USAGE_MONTH_STANDALONE_EXCEPT_NARROW
        );
    }

    /**
     * Transforms day names according to context transforms rules.
     *
     * @param string[] $names
     *
     * @return string[]
     */
    private function transform_days(array $names, string $width, bool $standalone): array
    {
        return $this->transform_months_or_days(
            $names,
            $width,
            $standalone,
            ContextTransforms::USAGE_DAY_STANDALONE_EXCEPT_NARROW
        );
    }

    /**
     * Transforms day names according to context transforms rules.
     *
     * @param string[] $names
     *
     * @return string[]
     */
    private function transform_months_or_days(array $names, string $width, bool $standalone, string $usage): array
    {
        if ($width === self::WIDTH_NARROW || !$standalone) {
            return $names;
        }

        return $this->apply_transform(
            $names,
            $usage,
            ContextTransforms::TYPE_STAND_ALONE
        );
    }

    /**
     * Transforms era names according to context transforms rules.
     *
     * @param string[] $names
     *
     * @return string[]
     */
    private function transform_eras(array $names, string $width): array
    {
        return match ($width) {
            self::ERA_ABBR => $this->apply_transform(
                $names,
                ContextTransforms::USAGE_ERA_ABBR,
                ContextTransforms::TYPE_STAND_ALONE
            ),
            self::ERA_NAMES => $this->apply_transform(
                $names,
                ContextTransforms::USAGE_ERA_NAME,
                ContextTransforms::TYPE_STAND_ALONE
            ),
            self::ERA_NARROW => $this->apply_transform(
                $names,
                ContextTransforms::USAGE_ERA_NARROW,
                ContextTransforms::TYPE_STAND_ALONE
            ),
            default => $names,
        };
    }

    /**
     * Transforms quarters names according to context transforms rules.
     *
     * @param string[] $names
     *
     * @return string[]
     */
    private function transform_quarters(array $names, string $width, bool $standalone): array
    {
        if ($standalone) {
            if ($width !== self::WIDTH_WIDE) {
                return $names;
            }

            return $this->apply_transform(
                $names,
                ContextTransforms::USAGE_QUARTER_STANDALONE_WIDE,
                ContextTransforms::TYPE_STAND_ALONE
            );
        }

        return match ($width) {
            self::WIDTH_ABBR => $this->apply_transform(
                $names,
                ContextTransforms::USAGE_QUARTER_ABBREVIATED,
                ContextTransforms::TYPE_STAND_ALONE
            ),
            self::WIDTH_WIDE => $this->apply_transform(
                $names,
                ContextTransforms::USAGE_QUARTER_FORMAT_WIDE,
                ContextTransforms::TYPE_STAND_ALONE
            ),
            self::WIDTH_NARROW => $this->apply_transform(
                $names,
                ContextTransforms::USAGE_QUARTER_NARROW,
                ContextTransforms::TYPE_STAND_ALONE
            ),
            default => $names,
        };
        // @codeCoverageIgnore
    }

    /**
     * Applies transformation to names.
     *
     * @param string[] $names
     *
     * @return string[]
     */
    private function apply_transform(array $names, string $usage, string $type): array
    {
        $context_transforms = $this->context_transforms;

        return array_map(
            static fn(string $str): string => $context_transforms->transform($str, $usage, $type),
            $names
        );
    }
}