{{-- A date field with M3's date pickers: docked under the field, modal, or modal text input.

     `mode` picks M3's three:

     - `docked` (the default): a text field that takes a typed date in the locale's numeric format
       (`13.09.2026` in `de`, `09/13/2026` in `en-US`), with the calendar dropping open under it —
       on a press of the field, its calendar button, or ArrowDown. On a compact window (below
       `sm`) the calendar opens as the modal picker instead, where a docked one would not fit.
     - `modal`: the field only shows the date; pressing it (or Enter, Space, ArrowDown) opens the
       calendar in a dialog, with a pencil to switch to typing.
     - `input`: the same dialog, opened on its text field, with a calendar icon to switch back.

     The calendar and the dialog's text field pick a draft; OK (or Enter on a day) makes it the
     value, Cancel or Escape leaves the value alone and returns focus to the field. What is typed
     into the docked field is the value as soon as it is a whole, allowed date.

     `wire:model` stores `Y-m-d` strings (`x-model` without Livewire). `range` picks a start and an
     end, bound as one array, `['start' => 'Y-m-d', 'end' => 'Y-m-d']` (either may be null) —
     one property rather than two, because a `wire:model` names one property, Livewire sends a
     range as one update so `after_or_equal:period.start` validates against the end it came
     with, and the errors for `period`, `period.start` and `period.end` all belong to this field.
     `min` and `max` (`Y-m-d` or a date object) disable the days outside them and keep the
     keyboard inside them. `label`, `hint`, `icon`, `variant` (`outlined`, `filled`) and `size`
     are the field's; `clearable` adds a button that empties it (a date, or both ends of a range)
     once it holds one; `name` adds hidden inputs carrying `Y-m-d` for a plain form post, and every
     other attribute (`required`, `disabled`, `readonly`) reaches the text field. Errors under
     the `wire:model` name replace the hint, and so does a typed date that cannot be read.

     Month and weekday names, the first day of the week and the typed format come from `Intl` for
     `app()->getLocale()` (resources/js/datepicker.js). An application that lets each person choose
     overrides the last two: `week-start` is the first day of the week, 0 (Sunday) to 6 (Saturday),
     and `format` the typed and displayed format, `dd`, `MM` and `yyyy` in any order around one
     delimiter (`.`, `/` or `-`: `dd.MM.yyyy`, `MM/dd/yyyy`, `yyyy-MM-dd`). The field, the typed-date
     reader, the calendar's columns and weekday header, Home and End, and the dialog's text fields
     all follow them; the names stay the locale's, and `wire:model` still stores `Y-m-d`. A value
     that is neither (`week-start="7"`, `format="d.M.yy"`) is ignored, as `null` is. Replaces
     ReStride's flatpickr picker: its `config` becomes `min`, `max`, `range` and `mode`.

     M3's date pickers (DatePickerModalTokens and DateInputModalTokens from androidx Compose
     Material 3, androidx commit 27cf9a7d5788aa0f5f2d8b6699ce279560daf326, with the layout of
     DatePicker.kt, DateRangePicker.kt and DateInput.kt; the docked picker's values from
     material-web's md-comp-date-picker-docked tokens, v0_192, as Compose has none; all Apache-2.0):
     surface-container-high at elevation 3, 360px wide, the extra-large corner (modal) or large
     (docked), 40px days in 48px cells, today outlined in primary, the chosen day in primary and a
     range's middle in secondary-container. The styles are resources/css/components/datepicker.css. --}}

@props([
    'label' => null,
    'hint' => null,
    'icon' => null,
    'size' => 'md',
    'variant' => null,
    'mode' => 'docked',
    'range' => false,
    'min' => null,
    'max' => null,
    'value' => null,
    'clearable' => false,
    'weekStart' => null,
    'format' => null,
])

@php
    $model = $attributes->wire('model')->value() ?: null;
    $mode = in_array($mode, ['docked', 'modal', 'input'], true) ? $mode : 'docked';
    $id = $attributes->get('id') ?? 'field-'.substr(md5($model.'|'.$label.'|datepicker'), 0, 12);
    $anchor = '--material-datepicker-'.preg_replace('/[^A-Za-z0-9_-]/', '-', $id);
    // A plain form's field is named, not bound: its errors are under its name (`files[]` → `files`, `a[b]` → `a.b`).
    $errorKey = $model ?? (filled($attributes->get('name')) ? str_replace(['[]', '[', ']'], ['', '.', ''], (string) $attributes->get('name')) : null);
    $messages = $errorKey !== null && isset($errors)
        ? array_values(array_unique(\Illuminate\Support\Arr::flatten([$errors->get($errorKey), $errors->get($errorKey.'.*')])))
        : [];
    $locale = str_replace('_', '-', app()->getLocale());
    $weekStart = (is_int($weekStart) || is_string($weekStart)) && preg_match('/^[0-6]\z/', (string) $weekStart) === 1 ? (int) $weekStart : null;
    $format = is_string($format) && preg_match('/^(dd|MM|yyyy)([.\/-])(dd|MM|yyyy)\2(dd|MM|yyyy)\z/', $format, $units) === 1 && count(array_unique([$units[1], $units[3], $units[4]])) === 3
        ? $format
        : null;

    $toIso = function (mixed $date): ?string {
        if ($date instanceof \DateTimeInterface) {
            return $date->format('Y-m-d');
        }

        if (is_string($date) && preg_match('/^(\d{4})-(\d{2})-(\d{2})(?:$|[T ])/', $date, $match) === 1 && checkdate((int) $match[2], (int) $match[3], (int) $match[1])) {
            return substr($date, 0, 10);
        }

        return null;
    };

    // Rendered as the bound property already says, so the field does not change once Alpine starts.
    $current = $value;
    if ($model !== null && ($component = \Livewire\Livewire::current()) !== null) {
        $current = data_get($component, $model);
    }
    $current = $range
        ? ['start' => $toIso(data_get($current, 'start')), 'end' => $toIso(data_get($current, 'end'))]
        : $toIso($current);

    // The typed format: `format`, or as resources/js/datepicker.js derives it, from ICU's short date when PHP has intl.
    $pattern = $format ?? 'yyyy-MM-dd';
    if ($format === null && class_exists(\IntlDateFormatter::class)) {
        $short = (string) (new \IntlDateFormatter(str_replace('-', '_', $locale), \IntlDateFormatter::SHORT, \IntlDateFormatter::NONE))->getPattern();
        $candidate = rtrim(str_replace('My', 'M/y', (string) preg_replace(['/[^dMy\/\-.]/', '/d{1,2}/', '/M{1,2}/', '/y{1,4}/'], ['', 'dd', 'MM', 'yyyy'], $short)), '.');
        if (preg_match('/^(?=.*dd)(?=.*MM)(?=.*yyyy)[dMy]+[\/\-.][dMy]+[\/\-.][dMy]+$/', $candidate) === 1) {
            $pattern = $candidate;
        }
    }
    $typed = fn (?string $date): string => $date === null ? '' : strtr($pattern, ['yyyy' => substr($date, 0, 4), 'MM' => substr($date, 5, 2), 'dd' => substr($date, 8, 2)]);
    $display = $range
        ? ($current['start'] === null && $current['end'] === null ? '' : $typed($current['start']).' – '.$typed($current['end']))
        : $typed($current);

    $title = $range ? __('Select dates') : __('Select date');
    $inputTitle = $range ? __('Enter dates') : __('Select date');
    $fieldName = $attributes->get('name');
    $invalid = $messages !== [];

    $config = [
        'locale' => $locale,
        'mode' => $mode,
        'range' => (bool) $range,
        'min' => $toIso($min),
        'max' => $toIso($max),
        'weekStart' => $weekStart,
        'format' => $format,
        'disabled' => (bool) $attributes->get('disabled'),
        'readonly' => (bool) $attributes->get('readonly'),
        'strings' => [
            'selected' => __('Selected date'),
            'entered' => __('Entered date'),
            'start' => __('Start date'),
            'end' => __('End date'),
            'pattern' => __('Date does not match expected pattern: :pattern'),
            'yearRange' => __('Date out of expected year range :start - :end'),
            'notAllowed' => __('Date not allowed: :date'),
            'invalidRange' => __('Invalid date range input'),
        ],
    ];
@endphp

<div
    {{ $attributes->only(['class', 'wire:key', 'x-model']) }}
    x-data="materialDatepicker({
        @if ($model !== null) value: @entangle($attributes->wire('model')), @else value: @js($current), @endif
        ...@js($config),
    })"
    @if ($model === null) x-modelable="value" @endif
    x-on:focusout="leave($event)"
    x-on:pointerdown.outside="open && presentation === 'docked' && cancel(false)"
    data-datepicker
>
    <div style="anchor-name: {{ $anchor }}">
        <x-livewire-material::field
            :$id
            :$label
            :$icon
            :$size
            :$variant
            :data-invalid="$invalid ? '' : null"
            :data-readonly="$attributes->get('readonly') ? '' : null"
            x-bind:data-invalid="(fieldError !== '' || {{ $invalid ? 'true' : 'false' }}) ? '' : null"
        >
            <input
                {{ $attributes->whereDoesntStartWith('wire:model')->except(['class', 'id', 'wire:key', 'x-model', 'name', 'value', 'placeholder', 'type']) }}
                x-ref="input"
                id="{{ $id }}"
                type="text"
                role="combobox"
                aria-haspopup="dialog"
                aria-controls="{{ $id }}-picker"
                aria-expanded="false"
                x-bind:aria-expanded="open.toString()"
                aria-describedby="{{ $id }}-support"
                @if ($invalid) aria-invalid="true" @endif
                x-bind:aria-invalid="(fieldError !== '' || {{ $invalid ? 'true' : 'false' }}) ? 'true' : null"
                autocomplete="off"
                value="{{ $display }}"
                placeholder=" "
                class="field-control"
                x-model="text"
                @if ($mode === 'docked')
                    x-bind:placeholder="placeholder"
                    x-on:input="typeInField()"
                    x-on:change="commitField()"
                    x-on:keydown.enter="commitField()"
                    x-on:click="show(false)"
                    x-on:keydown.arrow-down.prevent="open ? focusInside() : show()"
                    x-on:keydown.escape="if (open) { $event.preventDefault(); $event.stopPropagation(); cancel(); }"
                @else
                    readonly
                    x-on:click="show()"
                    x-on:keydown.enter.prevent="show()"
                    x-on:keydown.space.prevent="show()"
                    x-on:keydown.arrow-down.prevent="show()"
                @endif
            />

            <x-slot:trailing>
                @if ($clearable)
                    <button
                        type="button"
                        class="field-trailing field-clear field-button"
                        aria-label="{{ __('Clear') }}"
                        x-on:click="clear()"
                        @disabled($attributes->get('disabled') || $attributes->get('readonly'))
                        data-field-clear
                    >
                        <x-livewire-material::icon name="close" class="size-(--field-icon)" />
                    </button>
                @endif

                <button
                    type="button"
                    class="field-trailing field-button"
                    aria-label="{{ $title }}"
                    aria-haspopup="dialog"
                    aria-controls="{{ $id }}-picker"
                    x-bind:aria-expanded="open.toString()"
                    x-on:click="open ? cancel() : show()"
                    @if ($mode !== 'docked') tabindex="-1" @endif
                    @disabled($attributes->get('disabled') || $attributes->get('readonly'))
                    data-datepicker-toggle
                >
                    <x-livewire-material::icon name="calendar_today" class="size-(--field-icon)" />
                </button>
            </x-slot:trailing>
        </x-livewire-material::field>
    </div>

    <div id="{{ $id }}-support" data-datepicker-support data-size="{{ in_array($size, ['sm', 'xs'], true) ? $size : 'md' }}">
        <p x-cloak x-show="fieldError !== ''" x-text="fieldError" role="alert" data-datepicker-error></p>

        @if ($invalid)
            <div x-show="fieldError === ''" role="alert" data-datepicker-error>
                @foreach ($messages as $message)
                    <p>{{ $message }}</p>
                @endforeach
            </div>
        @elseif (filled($hint))
            <p x-show="fieldError === ''">{{ $hint }}</p>
        @endif
    </div>

    @if (filled($fieldName))
        @if ($range)
            <input type="hidden" name="{{ $fieldName }}[start]" value="{{ $current['start'] }}" x-bind:value="serialised.start ?? ''" />
            <input type="hidden" name="{{ $fieldName }}[end]" value="{{ $current['end'] }}" x-bind:value="serialised.end ?? ''" />
        @else
            <input type="hidden" name="{{ $fieldName }}" value="{{ $current }}" x-bind:value="serialised" />
        @endif
    @endif

    <dialog
        wire:ignore
        x-ref="dialog"
        id="{{ $id }}-picker"
        popover="manual"
        aria-label="{{ $title }}"
        style="position-anchor: {{ $anchor }}"
        x-bind:data-presentation="presentation"
        x-on:cancel.prevent="cancel()"
        x-on:click.self="presentation === 'modal' && cancel()"
        x-on:keydown.escape.prevent.stop="cancel()"
        data-datepicker-picker
    >
        <div tabindex="-1" data-datepicker-surface>
            <div data-datepicker-header x-show="presentation === 'modal'" @if ($range) data-range @endif>
                <p data-datepicker-title x-text="typing ? @js($inputTitle) : @js($title)">{{ $title }}</p>

                <div data-datepicker-headline-row>
                    <p data-datepicker-headline aria-live="polite" x-text="headline"></p>

                    <span x-show="! typing">
                        <x-livewire-material::button icon="edit" :tooltip="__('Switch to text input mode')" x-on:click="toggleTyping()" data-datepicker-switch />
                    </span>
                    <span x-show="typing">
                        <x-livewire-material::button icon="date_range" :tooltip="__('Switch to calendar input mode')" x-on:click="toggleTyping()" data-datepicker-switch />
                    </span>
                </div>
            </div>

            <div x-show="! typing" data-datepicker-calendar>
                <span id="{{ $id }}-month" class="sr-only" aria-live="polite" x-text="monthYear"></span>

                <div data-datepicker-nav x-show="presentation === 'modal'">
                    <button
                        type="button"
                        data-datepicker-menu-button
                        x-on:click="toggleView('years')"
                        x-bind:aria-expanded="(view === 'years').toString()"
                        x-bind:aria-label="monthYear + ', ' + @js(__('Switch to selecting a year'))"
                    >
                        <span x-text="monthYear"></span>
                        <x-livewire-material::icon name="arrow_drop_down" class="size-4.5" data-datepicker-menu-arrow />
                    </button>

                    <span data-datepicker-arrows x-bind:data-concealed="view !== 'days' ? '' : null">
                        <x-livewire-material::button icon="chevron_left" :tooltip="__('Previous month')" x-on:click="step(-1)" x-bind:disabled="view !== 'days' || ! canStep(-1)" data-datepicker-previous />
                        <x-livewire-material::button icon="chevron_right" :tooltip="__('Next month')" x-on:click="step(1)" x-bind:disabled="view !== 'days' || ! canStep(1)" data-datepicker-next />
                    </span>
                </div>

                <div data-datepicker-nav data-docked x-show="presentation === 'docked'">
                    <span data-datepicker-stepper>
                        <span data-datepicker-arrows x-bind:data-concealed="view !== 'days' ? '' : null">
                            <x-livewire-material::button icon="chevron_left" :tooltip="__('Previous month')" x-on:click="step(-1)" x-bind:disabled="view !== 'days' || ! canStep(-1)" />
                        </span>
                        <button
                            type="button"
                            data-datepicker-menu-button
                            x-on:click="toggleView('months')"
                            x-bind:aria-expanded="(view === 'months').toString()"
                            x-bind:aria-label="monthLabel + ', ' + @js(__('Switch to selecting a month'))"
                        >
                            <span x-text="monthLabel"></span>
                            <x-livewire-material::icon name="arrow_drop_down" class="size-4.5" data-datepicker-menu-arrow />
                        </button>
                        <span data-datepicker-arrows x-bind:data-concealed="view !== 'days' ? '' : null">
                            <x-livewire-material::button icon="chevron_right" :tooltip="__('Next month')" x-on:click="step(1)" x-bind:disabled="view !== 'days' || ! canStep(1)" />
                        </span>
                    </span>

                    <span data-datepicker-stepper>
                        <span data-datepicker-arrows x-bind:data-concealed="view !== 'days' ? '' : null">
                            <x-livewire-material::button icon="chevron_left" :tooltip="__('Previous year')" x-on:click="step(-12)" x-bind:disabled="view !== 'days' || ! canStep(-12)" />
                        </span>
                        <button
                            type="button"
                            data-datepicker-menu-button
                            x-on:click="toggleView('years')"
                            x-bind:aria-expanded="(view === 'years').toString()"
                            x-bind:aria-label="yearLabel + ', ' + @js(__('Switch to selecting a year'))"
                        >
                            <span x-text="yearLabel"></span>
                            <x-livewire-material::icon name="arrow_drop_down" class="size-4.5" data-datepicker-menu-arrow />
                        </button>
                        <span data-datepicker-arrows x-bind:data-concealed="view !== 'days' ? '' : null">
                            <x-livewire-material::button icon="chevron_right" :tooltip="__('Next year')" x-on:click="step(12)" x-bind:disabled="view !== 'days' || ! canStep(12)" />
                        </span>
                    </span>
                </div>

                <table role="grid" aria-labelledby="{{ $id }}-month" x-show="view === 'days'" x-on:keydown="gridKey($event)" data-datepicker-grid>
                    <thead>
                        <tr>
                            <template x-for="weekday in weekdays" :key="weekday.long">
                                <th scope="col" x-bind:abbr="weekday.long" x-text="weekday.narrow"></th>
                            </template>
                        </tr>
                    </thead>
                    <tbody>
                        <template x-for="(week, row) in weeks" :key="row">
                            <tr>
                                <template x-for="(cell, column) in week" :key="column">
                                    <td
                                        role="gridcell"
                                        x-bind:tabindex="cell.blank ? null : (cell.focused ? 0 : -1)"
                                        x-bind:aria-label="cell.blank ? null : cell.name"
                                        x-bind:aria-selected="! cell.blank && (cell.selected || cell.between) ? 'true' : null"
                                        x-bind:aria-disabled="! cell.blank && cell.disabled ? 'true' : null"
                                        x-bind:aria-current="! cell.blank && cell.today ? 'date' : null"
                                        x-bind:data-value="cell.blank ? null : cell.value"
                                        x-bind:data-blank="cell.blank ? '' : null"
                                        x-bind:data-outside="cell.outside ? '' : null"
                                        x-bind:data-today="cell.today ? '' : null"
                                        x-bind:data-selected="cell.selected ? '' : null"
                                        x-bind:data-start="cell.start ? '' : null"
                                        x-bind:data-end="cell.end ? '' : null"
                                        x-bind:data-between="cell.between ? '' : null"
                                        x-on:click="choose(cell)"
                                        data-datepicker-day
                                    ><span x-text="cell.blank ? '' : cell.label"></span></td>
                                </template>
                            </tr>
                        </template>
                    </tbody>
                </table>

                <div role="listbox" aria-label="{{ __('Years') }}" x-show="view === 'years' && presentation === 'modal'" x-on:keydown="listKey($event, 3)" data-datepicker-list data-datepicker-years>
                    <template x-for="year in years" :key="year.value">
                        <button
                            type="button"
                            role="option"
                            x-bind:aria-selected="year.selected.toString()"
                            x-bind:tabindex="year.selected ? 0 : -1"
                            x-bind:data-current="year.current ? '' : null"
                            x-on:click="showMonthOf(year.value, +shown.slice(5, 7))"
                            x-text="year.label"
                            data-datepicker-year
                        ></button>
                    </template>
                </div>

                <div role="listbox" aria-label="{{ __('Months') }}" x-show="view === 'months' && presentation === 'docked'" x-on:keydown="listKey($event)" data-datepicker-list data-datepicker-menu>
                    <template x-for="month in months" :key="month.value">
                        <button
                            type="button"
                            role="option"
                            x-bind:aria-selected="month.selected.toString()"
                            x-bind:aria-disabled="month.disabled ? 'true' : null"
                            x-bind:tabindex="month.selected ? 0 : -1"
                            x-on:click="month.disabled || showMonthOf(+shown.slice(0, 4), month.value)"
                            data-datepicker-option
                        >
                            <x-livewire-material::icon name="check" data-datepicker-check />
                            <span x-text="month.label"></span>
                        </button>
                    </template>
                </div>

                <div role="listbox" aria-label="{{ __('Years') }}" x-show="view === 'years' && presentation === 'docked'" x-on:keydown="listKey($event)" data-datepicker-list data-datepicker-menu>
                    <template x-for="year in years" :key="year.value">
                        <button
                            type="button"
                            role="option"
                            x-bind:aria-selected="year.selected.toString()"
                            x-bind:tabindex="year.selected ? 0 : -1"
                            x-on:click="showMonthOf(year.value, +shown.slice(5, 7))"
                            data-datepicker-option
                        >
                            <x-livewire-material::icon name="check" data-datepicker-check />
                            <span x-text="year.label"></span>
                        </button>
                    </template>
                </div>
            </div>

            <div x-show="typing" data-datepicker-entry>
                <div @if ($range) data-range @endif data-datepicker-entry-fields>
                    <x-livewire-material::field id="{{ $id }}-entry" :label="$range ? __('Start date') : __('Date')" :$variant x-bind:data-invalid="entryError !== '' ? '' : null">
                        <input
                            id="{{ $id }}-entry"
                            type="text"
                            autocomplete="off"
                            placeholder=" "
                            x-bind:placeholder="format.placeholder"
                            x-bind:aria-invalid="entryError !== '' ? 'true' : null"
                            aria-describedby="{{ $id }}-entry-support"
                            x-ref="entry"
                            x-model="entry"
                            x-on:input="typeEntry()"
                            x-on:keydown.enter.prevent="confirm()"
                            class="field-control"
                        />
                    </x-livewire-material::field>

                    @if ($range)
                        <x-livewire-material::field id="{{ $id }}-entry-end" :label="__('End date')" :$variant x-bind:data-invalid="entryError !== '' ? '' : null">
                            <input
                                id="{{ $id }}-entry-end"
                                type="text"
                                autocomplete="off"
                                placeholder=" "
                                x-bind:placeholder="format.placeholder"
                                x-bind:aria-invalid="entryError !== '' ? 'true' : null"
                                aria-describedby="{{ $id }}-entry-support"
                                x-model="entryEnd"
                                x-on:input="typeEntry()"
                                x-on:keydown.enter.prevent="confirm()"
                                class="field-control"
                            />
                        </x-livewire-material::field>
                    @endif
                </div>

                <div id="{{ $id }}-entry-support" data-datepicker-support>
                    <p x-show="entryError !== ''" x-text="entryError" role="alert" data-datepicker-error></p>
                </div>
            </div>

            <div x-show="view === 'days' || typing || presentation === 'modal'" data-datepicker-actions>
                <x-livewire-material::button :label="__('Cancel')" x-on:click="cancel()" data-datepicker-cancel />
                <x-livewire-material::button :label="__('OK')" x-on:click="confirm()" data-datepicker-confirm />
            </div>
        </div>
    </dialog>
</div>