{{-- A time: M3's time picker, opened from a text field.

         <x-timepicker label="Starts at" wire:model="startsAt" />
         <x-timepicker label="Alarm" wire:model.live="alarm" format="24" step="5" min="06:00" max="22:00" clearable />

     The field is read-only and opens the picker in a modal `<dialog>` on a press, Enter, Space or
     ArrowDown (the clock icon at its end opens it too). The picker is M3's dial: the hour and minute
     boxes on top, AM and PM beside them on a 12-hour clock, the clock face below. A press or a drag
     on the dial picks the hour, then it moves on to the minutes; the arrow keys change the value on
     the focused dial, Home and End go to the ends, Enter confirms, and Escape, Cancel or a press on
     the scrim close it without a change, handing focus back to the field. The keyboard icon swaps
     the dial for M3's input variant: two text fields, with the error under a field that holds
     something impossible. In a landscape window the dial lies on its side, as Compose lays it out.

     `wire:model` (or `x-model`) holds the time as `H:i`, and null until one is chosen; a value with
     seconds (`09:30:00`, from a `time` column) is read, and written back as `H:i`. Nothing is written
     until OK. The draft starts at the bound time, or now. Errors are read from the bag under the
     `wire:model` name and replace the hint.

     `format` is `12` or `24`; without it the hour cycle is the locale's (`locale`, the app locale by
     default) as `Intl.DateTimeFormat` reports it, and the field shows the time as the locale writes
     it. `step` is the minute step (a tap on the minute dial picks fives, or steps when five is not a
     multiple of the step; a drag and the arrows move by the step). `min` and `max` (`H:i`, inclusive;
     a `min` later than `max` spans midnight) grey out and skip what lies outside them and turn typed
     values outside them into errors — validate on the server as well. `clearable` adds a button that
     empties the field; `name` posts the value from a hidden input. `label`, `hint`, `icon`, `variant`
     and `size` are the field's; `class` and `style` land on the root, other attributes (`required`,
     `disabled`, `placeholder`) reach the field's input.

     From androidx Compose Material 3 at commit 27cf9a7d5788aa0f5f2d8b6699ce279560daf326 (Apache-2.0):
     TimePickerTokens and TimeInputTokens — a surface-container-high dialog with an extra-large
     corner and elevation 3, a 256dp surface-container-highest dial with body-large numbers, a primary
     selector with a 48dp handle, a 2dp line and an 8dp centre, 96×80 time selector boxes in
     display-large (primary-container when selected; 114dp wide on a 24-hour clock, where there is no
     period selector beside them, per TimeSelector24HVerticalContainerWidth), 96×72 time fields in
     display-medium — and TimePicker.kt and TimePickerDialog.kt for the layout, the 24-hour inner
     ring (12–23, at 69dp; 00–11 outside at 101dp, as Material Components for Android labels them
     too), the gestures, the move on to minutes and the error texts. The period selector keeps
     Compose's current default shape morph (`isUpdatedTimepickerToggleEnabled`) but M3's own
     tertiary-container, which is what holds hour/minute (primary-container) and AM/PM apart; it is a
     radio group, as M3's labelling table says, so the arrows move between AM and PM. The dial's
     numbers are aria-hidden; the dial is a `slider` whose value text names the hour or minute. The
     dialog is `wire:ignore`, so a Livewire render never closes an open picker or resets its draft. --}}

@props([
    'label' => null,
    'hint' => null,
    'icon' => null,
    'variant' => null,
    'size' => 'md',
    'format' => null,
    'locale' => null,
    'min' => null,
    'max' => null,
    'step' => 1,
    'value' => null,
    'name' => null,
    'clearable' => false,
])

@php
    $model = $attributes->wire('model')->value() ?: null;
    // A plain form's field is named, not bound: its errors are under its name (`files[]` → `files`, `a[b]` → `a.b`).
    $errorKey = $model ?? (filled($name) ? str_replace(['[]', '[', ']'], ['', '.', ''], (string) $name) : null);
    $messages = $errorKey !== null && isset($errors) ? \Illuminate\Support\Arr::flatten($errors->get($errorKey)) : [];
    $id = $attributes->get('id') ?? 'timepicker-'.substr(md5($model.'|'.$label.'|'.$name.'|timepicker'), 0, 12);

    $cycle = in_array((string) $format, ['12', '24'], true) ? (int) $format : null;
    $locale = str_replace('_', '-', filled($locale) ? $locale : app()->getLocale());
    $interval = is_numeric($step) && (int) $step >= 1 && (int) $step <= 60 ? (int) $step : 1;
    $clock = fn (mixed $time): ?string => is_string($time) && preg_match('/^([01]?\d|2[0-3]):([0-5]\d)/', $time, $parts) === 1
        ? sprintf('%02d:%02d', $parts[1], $parts[2])
        : null;
    $earliest = $clock($min);
    $latest = $clock($max);

    // Rendered as the bound property already says, so the field is not empty until Alpine starts.
    $current = $value;
    if ($model !== null && ($component = \Livewire\Livewire::current()) !== null) {
        $current = data_get($component, $model);
    }
    $current = $clock($current);

    // The first frame writes the time as the browser will; ICU decides the hour cycle on both sides.
    $display = '';
    if ($current !== null) {
        $time = \Carbon\CarbonImmutable::createFromFormat('!H:i', $current, 'UTC');
        $shown = $cycle;

        if (class_exists(\IntlDatePatternGenerator::class)) {
            $generator = new \IntlDatePatternGenerator(str_replace('-', '_', $locale));
            $shown ??= preg_match('/[hK]/', preg_replace("/'[^']*'/", '', (string) $generator->getBestPattern('j'))) === 1 ? 12 : 24;
            $pattern = $generator->getBestPattern($shown === 12 ? 'hmm' : 'Hmm');
            $display = (string) (new \IntlDateFormatter(str_replace('-', '_', $locale), \IntlDateFormatter::NONE, \IntlDateFormatter::NONE, 'UTC', null, $pattern))->format($time);
        } else {
            $display = $shown === 12 ? $time->format('g:i A') : $time->format('H:i');
        }
    }

    $config = [
        'locale' => $locale,
        'format' => $cycle,
        'min' => $earliest,
        'max' => $latest,
        'step' => $interval,
        'strings' => [
            'am' => __('AM'),
            'pm' => __('PM'),
            'oclock' => __(':hour o\'clock'),
            'hours' => __(':hour hours'),
            'minutes' => __(':minute minutes'),
            'hourError12' => __('Hour must be 1–12'),
            'hourError24' => __('Hour must be 0–23'),
            'minuteError' => __('Minute must be 0–59'),
            'stepError' => __('Minute must be a multiple of :step'),
            'between' => __('Choose a time from :min to :max'),
            'after' => __('Choose :min or later'),
            'before' => __('Choose :max or earlier'),
        ],
    ];

    $constrained = $earliest !== null || $latest !== null || $interval > 1;

    // The dial's numbers, placed round the ring from twelve o'clock (TimePicker.kt's CircularLayout).
    $spot = fn (int $index): string => sprintf('--x: %.4F; --y: %.4F', sin(deg2rad($index * 30)), -cos(deg2rad($index * 30)));
    $sets = [
        'hour12' => array_map(fn (int $index): array => ['value' => $index ?: 12, 'text' => $index ?: 12, 'index' => $index, 'inner' => false, 'allowed' => "hourAllowed({$index} + (isPm ? 12 : 0))"], range(0, 11)),
        'hour24' => [
            ...array_map(fn (int $index): array => ['value' => $index, 'text' => $index === 0 ? '00' : $index, 'index' => $index, 'inner' => false, 'allowed' => "hourAllowed({$index})"], range(0, 11)),
            ...array_map(fn (int $index): array => ['value' => $index + 12, 'text' => $index + 12, 'index' => $index, 'inner' => true, 'allowed' => 'hourAllowed('.($index + 12).')'], range(0, 11)),
        ],
        'minute' => array_map(fn (int $index): array => ['value' => $index * 5, 'text' => $index === 0 ? '00' : $index * 5, 'index' => $index, 'inner' => false, 'allowed' => 'minuteAllowed('.($index * 5).')'], range(0, 11)),
    ];

    $inputAttributes = $attributes->whereDoesntStartWith(['wire:model', 'x-model'])->except(['class', 'style', 'id', 'wire:key', 'placeholder']);
    $disabled = (bool) $attributes->get('disabled');
    $described = $messages !== [] || filled($hint);
    $fieldIconSize = ['sm' => 20, 'xs' => 16][$size] ?? 24;
@endphp

<div
    {{ $attributes->only(['class', 'style', 'wire:key', 'x-model']) }}
    x-data="materialTimepicker(@if ($model !== null) @entangle($attributes->wire('model')) @else @js($current) @endif, @js($config))"
    @if ($model === null) x-modelable="value" @endif
>
    <x-livewire-material::field :$id :$label :$hint :$messages :$icon :$size :$variant data-md-timepicker-field>
        <input
            {{ $inputAttributes }}
            id="{{ $id }}"
            type="text"
            readonly
            value="{{ $display }}"
            x-bind:value="display"
            x-ref="input"
            placeholder="{{ filled($attributes->get('placeholder')) ? $attributes->get('placeholder') : ' ' }}"
            autocomplete="off"
            aria-haspopup="dialog"
            aria-controls="{{ $id }}-dialog"
            aria-expanded="false"
            x-bind:aria-expanded="open.toString()"
            @if ($messages !== []) aria-invalid="true" @endif
            @if ($described) aria-describedby="{{ $id }}-support" @endif
            data-md-field-control
            x-on:click="show()"
            x-on:keydown.enter.prevent="show()"
            x-on:keydown.space.prevent="show()"
            x-on:keydown.arrow-down.prevent="show()"
        />

        <x-slot:trailing>
            @if ($clearable)
                <button
                    type="button"
                    x-on:click="value = null; $refs.input.focus()"
                    data-md-field-trailing
                    data-md-field-button
                    data-md-field-clear
                    aria-label="{{ __('Clear') }}"
                    @disabled($disabled)
                >
                    <x-livewire-material::icon name="close" :size="$fieldIconSize" />
                </button>
            @endif

            <button
                type="button"
                tabindex="-1"
                x-on:click="show()"
                data-md-field-trailing
                data-md-field-button
                aria-label="{{ __('Choose time') }}"
                data-md-timepicker-open
                @disabled($disabled)
            >
                <x-livewire-material::icon name="schedule" :size="$fieldIconSize" />
            </button>
        </x-slot:trailing>
    </x-livewire-material::field>

    @if (filled($name))
        <input type="hidden" name="{{ $name }}" value="{{ $current }}" x-bind:value="value ?? ''" />
    @endif

    <dialog
        id="{{ $id }}-dialog"
        wire:ignore
        x-ref="dialog"
        aria-labelledby="{{ $id }}-title"
        data-md-timepicker-dialog
        x-on:close="closed()"
        x-on:pointerdown="scrimPressed = $event.target === $el"
        x-on:click.self="if (scrimPressed) cancel()"
    >
        <div data-md-timepicker-surface x-bind:data-md-mode="mode" data-md-mode="dial">
            <h2 id="{{ $id }}-title" data-md-timepicker-title x-text="mode === 'dial' ? @js(__('Select time')) : @js(__('Enter time'))">{{ __('Select time') }}</h2>

            <div data-md-timepicker-picker>
                <div data-md-timepicker-display x-bind:data-md-cycle="is24 ? '24' : '12'">
                    <div data-md-timepicker-numbers>
                        <button
                            type="button"
                            data-md-timepicker-box="hour"
                            class="md-state-layer md-focus-ring"
                            aria-pressed="true"
                            x-bind:aria-pressed="(view === 'hour').toString()"
                            x-bind:aria-label="@js(__('Select hour')) + ', ' + hourLabel"
                            x-on:click="choose('hour')"
                            x-text="hourLabel"
                        ></button>
                        <span data-md-timepicker-separator aria-hidden="true">:</span>
                        <button
                            type="button"
                            data-md-timepicker-box="minute"
                            class="md-state-layer md-focus-ring"
                            aria-pressed="false"
                            x-bind:aria-pressed="(view === 'minute').toString()"
                            x-bind:aria-label="@js(__('Select minutes')) + ', ' + minuteLabel"
                            x-on:click="choose('minute')"
                            x-text="minuteLabel"
                        ></button>
                    </div>

                    <div
                        data-md-timepicker-period
                        role="radiogroup"
                        aria-label="{{ __('Select AM or PM') }}"
                        x-show="! is24"
                        x-on:keydown.arrow-right.prevent="movePeriod($event)"
                        x-on:keydown.arrow-left.prevent="movePeriod($event)"
                        x-on:keydown.arrow-down.prevent="movePeriod($event)"
                        x-on:keydown.arrow-up.prevent="movePeriod($event)"
                    >
                        @foreach ([false => 'am', true => 'pm'] as $pm => $period)
                            <button
                                type="button"
                                data-md-timepicker-period-option="{{ $period }}"
                                class="md-state-layer md-focus-ring"
                                role="radio"
                                aria-checked="false"
                                x-bind:aria-checked="({{ $pm ? '' : '! ' }}isPm).toString()"
                                x-bind:tabindex="({{ $pm ? '' : '! ' }}isPm) ? 0 : -1"
                                x-bind:disabled="! periodAllowed({{ $pm ? 'true' : 'false' }})"
                                x-on:click="setPeriod({{ $pm ? 'true' : 'false' }})"
                                x-text="periods[{{ (int) $pm }}]"
                            >{{ $pm ? __('PM') : __('AM') }}</button>
                        @endforeach
                    </div>
                </div>

                <div
                    x-ref="dial"
                    class="md-focus-ring"
                    data-md-timepicker-dial
                    role="slider"
                    tabindex="0"
                    aria-valuemin="0"
                    x-bind:aria-label="view === 'hour' ? @js(__('Select hour')) : @js(__('Select minutes'))"
                    x-bind:aria-valuemax="view === 'hour' ? 23 : 59"
                    x-bind:aria-valuenow="view === 'hour' ? hour : minute"
                    x-bind:aria-valuetext="valueText"
                    x-bind:data-md-view="view"
                    x-bind:data-md-cycle="is24 ? '24' : '12'"
                    x-bind:data-md-inner="inner ? '' : null"
                    x-bind:data-md-dragging="dragging ? '' : null"
                    x-bind:style="{ '--timepicker-angle': angle + 'deg' }"
                    x-on:pointerdown="press($event)"
                    x-on:keydown="key($event)"
                >
                    @foreach (['labels', 'ink'] as $layer)
                        @if ($layer === 'ink')
                            <div data-md-timepicker-selector aria-hidden="true">
                                <span data-md-timepicker-track></span>
                                <span data-md-timepicker-centre></span>
                                <span data-md-timepicker-handle></span>
                            </div>
                        @endif

                        <div data-md-timepicker-{{ $layer }} aria-hidden="true">
                            @foreach ($sets as $set => $labels)
                                <div data-md-timepicker-set="{{ $set }}">
                                    @foreach ($labels as $spotLabel)
                                        <span
                                            @if ($layer === 'labels') data-md-timepicker-label="{{ $set }}" data-md-value="{{ $spotLabel['value'] }}" @endif
                                            @if ($spotLabel['inner']) data-md-inner @endif
                                            @if ($constrained && $layer === 'labels') x-bind:data-md-disabled="{{ $spotLabel['allowed'] }} ? null : ''" @endif
                                            style="{{ $spot($spotLabel['index']) }}"
                                        >{{ $spotLabel['text'] }}</span>
                                    @endforeach
                                </div>
                            @endforeach
                        </div>
                    @endforeach
                </div>
            </div>

            <div data-md-timepicker-typing>
                <div data-md-timepicker-inputs>
                    @foreach (['hour' => __('Hour'), 'minute' => __('Minute')] as $part => $partLabel)
                        @if ($part === 'minute')
                            <span data-md-timepicker-separator aria-hidden="true">:</span>
                        @endif

                        <div data-md-timepicker-column>
                            <input
                                id="{{ $id }}-{{ $part }}"
                                type="text"
                                inputmode="numeric"
                                maxlength="2"
                                autocomplete="off"
                                data-md-timepicker-input="{{ $part }}"
                                x-ref="{{ $part }}Input"
                                aria-label="{{ $partLabel }}"
                                aria-describedby="{{ $id }}-{{ $part }}-support"
                                x-bind:aria-invalid="{{ $part }}Error ? 'true' : null"
                                x-bind:value="{{ $part }}Text"
                                x-on:input="{{ $part === 'hour' ? 'typeHour' : 'typeMinute' }}($event)"
                                x-on:focus="view = '{{ $part }}'; $el.select()"
                                x-on:keydown.enter.prevent="confirm()"
                            />
                            <p
                                id="{{ $id }}-{{ $part }}-support"
                                data-md-timepicker-support
                                aria-live="polite"
                                x-bind:data-md-error="{{ $part }}Error ? '' : null"
                                x-text="{{ $part }}Error ?? @js($partLabel)"
                            >{{ $partLabel }}</p>
                        </div>
                    @endforeach

                    <div
                        data-md-timepicker-period
                        role="radiogroup"
                        aria-label="{{ __('Select AM or PM') }}"
                        x-show="! is24"
                        x-on:keydown.arrow-right.prevent="movePeriod($event)"
                        x-on:keydown.arrow-left.prevent="movePeriod($event)"
                        x-on:keydown.arrow-down.prevent="movePeriod($event)"
                        x-on:keydown.arrow-up.prevent="movePeriod($event)"
                    >
                        @foreach ([false => 'am', true => 'pm'] as $pm => $period)
                            <button
                                type="button"
                                data-md-timepicker-period-option="{{ $period }}"
                                class="md-state-layer md-focus-ring"
                                role="radio"
                                aria-checked="false"
                                x-bind:aria-checked="({{ $pm ? '' : '! ' }}isPm).toString()"
                                x-bind:tabindex="({{ $pm ? '' : '! ' }}isPm) ? 0 : -1"
                                x-bind:disabled="! periodAllowed({{ $pm ? 'true' : 'false' }})"
                                x-on:click="setPeriod({{ $pm ? 'true' : 'false' }})"
                                x-text="periods[{{ (int) $pm }}]"
                            >{{ $pm ? __('PM') : __('AM') }}</button>
                        @endforeach
                    </div>
                </div>

                <p data-md-timepicker-range-error role="alert" x-show="rangeError" x-text="rangeError"></p>
            </div>

            <div data-md-timepicker-actions>
                <span data-md-timepicker-when="dial">
                    <x-livewire-material::button icon="keyboard" :tooltip="__('Switch to text input mode')" x-on:click="toggleMode()" data-md-timepicker-mode="input" />
                </span>
                <span data-md-timepicker-when="input">
                    <x-livewire-material::button icon="schedule" :tooltip="__('Switch to clock mode')" x-on:click="toggleMode()" data-md-timepicker-mode="dial" />
                </span>
                <span data-md-timepicker-spacer></span>
                <x-livewire-material::button :label="__('Cancel')" x-on:click="cancel()" data-md-timepicker-cancel />
                <x-livewire-material::button :label="__('OK')" x-on:click="confirm()" data-md-timepicker-confirm />
            </div>
        </div>
    </dialog>
</div>