{{-- Choosing from a list: M3's filter chips, or a searchable field with a menu.

     Two shapes for two jobs, both on `options` (`['id' => …, 'name' => …]`, read through
     `option-value` and `option-label`), `label`, `hint` and `single`:

     - **Chips**, the default. Every option is on screen and a press turns it on or off — "the days
       you are free" is seven filter chips, not a dropdown opened seven times. `single` makes them
       choice chips, one on at a time.
     - **`searchable`**, for a list too long to lay out — four hundred time zones. A text field
       that filters as you type, with the matches in M3's menu under it: the arrow keys move,
       Enter chooses, Escape puts the field back. One value only. The list is a popover in the top
       layer, placed by CSS anchor positioning, so a card's clipping never cuts it off. `icon`,
       `variant` and `placeholder` are the field's.

     The selection lives in Alpine, entangled with the `wire:model` property (live with
     `wire:model.live`), rather than in native checkboxes, which would send every value back as a
     string: a list of integers stays a list of integers. Without `wire:model` it works on its own
     and binds with `x-model`. Errors for the property and its items replace the hint. When the
     options change on the server, give the component a `wire:key` that changes with them: the
     options are baked into its Alpine state. --}}

@props([
    'label' => null,
    'hint' => null,
    'icon' => null,
    'options' => [],
    'optionValue' => 'id',
    'optionLabel' => 'name',
    'single' => false,
    'searchable' => false,
    'variant' => null,
    'placeholder' => null,
    'value' => null,
])

@php
    $model = $attributes->wire('model')->value() ?: null;
    $messages = $model !== null && isset($errors)
        ? array_values(array_unique(\Illuminate\Support\Arr::flatten([$errors->get($model), $errors->get($model.'.*')])))
        : [];
    $choices = collect($options)->map(fn ($option): array => [
        'value' => data_get($option, $optionValue),
        'label' => (string) data_get($option, $optionLabel),
        'disabled' => (bool) data_get($option, 'disabled', false),
    ])->values()->all();
    $single = $single || $searchable;

    // Rendered as the bound property already says, so nothing flips once Alpine starts.
    $current = $value;
    if ($model !== null && ($component = \Livewire\Livewire::current()) !== null) {
        $current = data_get($component, $model);
    }
    $isSelected = fn ($candidate): bool => $single
        ? $current !== null && (string) $current === (string) $candidate
        : in_array((string) $candidate, array_map('strval', array_filter((array) $current, 'is_scalar')), true);

    $id = $attributes->get('id') ?? 'field-'.substr(md5($model.'|'.$label.'|choices'), 0, 12);
    $anchor = '--material-choices-'.\Illuminate\Support\Str::lower(\Illuminate\Support\Str::random(10));
@endphp

@if ($searchable)
    <div
        {{ $attributes->only(['class', 'wire:key', 'x-model']) }}
        x-data="{
            @if ($model !== null) value: @entangle($attributes->wire('model')), @else value: @js($current), @endif
            options: @js($choices),
            query: '',
            open: false,
            active: 0,
            selecting: false,
            get selectedLabel() {
                return this.options.find((option) => option.value === this.value)?.label ?? '';
            },
            get filtered() {
                const query = this.query.trim().toLowerCase();

                return query === '' || this.query === this.selectedLabel
                    ? this.options
                    : this.options.filter((option) => option.label.toLowerCase().includes(query));
            },
            init() {
                this.query = this.selectedLabel;
                this.$watch('value', () => { if (! this.open) this.query = this.selectedLabel; });
                this.$watch('open', (open) => {
                    const list = this.$refs.list;
                    if (open && ! list.matches(':popover-open')) list.showPopover();
                    if (! open && list.matches(':popover-open')) list.hidePopover();
                });
            },
            show() {
                this.open = true;
                this.active = Math.max(0, this.filtered.findIndex((option) => option.value === this.value));
                this.$nextTick(() => this.reveal());
            },
            close() {
                this.open = false;
                this.query = this.selectedLabel;
            },
            move(step) {
                if (! this.open) return this.show();
                if (this.filtered.length === 0) return;
                this.active = (this.active + step + this.filtered.length) % this.filtered.length;
                this.$nextTick(() => this.reveal());
            },
            choose(option) {
                if (! option || option.disabled) return;
                this.value = option.value;
                this.query = option.label;
                this.open = false;
            },
            reveal() {
                this.$refs.list.querySelector('[data-active]')?.scrollIntoView({ block: 'nearest' });
            },
        }"
        @if ($model === null) x-modelable="value" @endif
    >
        <div style="anchor-name: {{ $anchor }}">
            <x-field :$id :$label :$hint :$messages :$icon :$variant>
                <input
                    id="{{ $id }}"
                    type="text"
                    role="combobox"
                    autocomplete="off"
                    aria-autocomplete="list"
                    aria-controls="{{ $id }}-list"
                    aria-expanded="false"
                    x-bind:aria-expanded="open.toString()"
                    x-bind:aria-activedescendant="open && filtered[active] ? '{{ $id }}-option-' + active : null"
                    @if ($messages !== []) aria-invalid="true" @endif
                    @if ($messages !== [] || filled($hint)) aria-describedby="{{ $id }}-support" @endif
                    placeholder="{{ filled($placeholder) ? $placeholder : ' ' }}"
                    class="field-control"
                    x-model="query"
                    x-on:focus="show(); $nextTick(() => $el.select())"
                    x-on:pointerdown="selecting = document.activeElement !== $el"
                    x-on:click="if (selecting) { $el.select(); selecting = false; } if (! open) show();"
                    x-on:input="open = true; active = 0"
                    x-on:keydown.arrow-down.prevent="move(1)"
                    x-on:keydown.arrow-up.prevent="move(-1)"
                    x-on:keydown.enter.prevent="choose(filtered[active])"
                    x-on:keydown.escape="close()"
                    x-on:keydown.tab="close()"
                    x-on:blur="close()"
                />

                <x-slot:trailing>
                    <x-icon name="arrow_drop_down" class="field-trailing field-arrow size-(--field-icon)" />
                </x-slot:trailing>
            </x-field>
        </div>

        <ul
            id="{{ $id }}-list"
            role="listbox"
            popover="manual"
            x-ref="list"
            @if (filled($label)) aria-label="{{ $label }}" @endif
            style="position-anchor: {{ $anchor }}"
            class="field-menu"
        >
            <template x-for="(option, index) in filtered" :key="option.value">
                <li
                    role="option"
                    x-bind:id="'{{ $id }}-option-' + index"
                    x-bind:aria-selected="(option.value === value).toString()"
                    x-bind:aria-disabled="option.disabled ? 'true' : null"
                    x-bind:data-active="index === active ? '' : null"
                    x-on:mousedown.prevent="choose(option)"
                    x-on:mousemove="active = index"
                    class="field-option"
                >
                    <span x-text="option.label"></span>
                    <x-icon name="check" class="field-check size-6" />
                </li>
            </template>
            <li x-show="filtered.length === 0" class="px-4 py-3 type-body-md text-on-surface-variant">{{ __('Nothing matches') }}</li>
        </ul>
    </div>
@else
    <div
        {{ $attributes->only(['class', 'wire:key', 'x-model']) }}
        x-data="{
            @if ($model !== null) selection: @entangle($attributes->wire('model')), @else selection: @js($current ?? ($single ? null : [])), @endif
            options: @js(array_column($choices, 'value')),
            selected(index) {
                const value = this.options[index];

                return @js($single) ? this.selection === value : (this.selection ?? []).includes(value);
            },
            toggle(index) {
                const value = this.options[index];

                if (@js($single)) {
                    this.selection = value;

                    return;
                }

                const current = this.selection ?? [];
                this.selection = current.includes(value) ? current.filter((each) => each !== value) : [...current, value];
            },
        }"
        @if ($model === null) x-modelable="selection" @endif
    >
        <x-chip-set :$label :$hint :error-field="$model">
            @foreach ($choices as $index => $choice)
                <x-chip
                    type="filter"
                    :label="$choice['label']"
                    :selected="$isSelected($choice['value'])"
                    :disabled="$choice['disabled']"
                    x-bind:aria-pressed="selected({{ $index }}).toString()"
                    x-on:click="toggle({{ $index }})"
                />
            @endforeach
        </x-chip-set>
    </div>
@endif