@php
    $item = $drug->inventoryItem;
    $lowStock = $item && $item->reorder_level && $item->quantity_on_hand <= $item->reorder_level;
    $safety = collect([
        $drug->is_controlled ? ['shield', 'text-red-500', $drug->controlled_schedule_label.' — controlled'] : null,
        $drug->is_high_alert ? ['exclamation', 'text-amber-500', 'High alert'] : null,
        $drug->is_essential ? ['check', 'text-emerald-500', 'Essential'] : null,
        $drug->is_pregnancy_safe ? ['heart-pulse', 'text-pink-500', 'Pregnancy category '.strtoupper((string) $drug->pregnancy_category)] : null,
        ! $drug->is_active ? ['x', 'text-slate-400', 'Retired'] : null,
    ])->filter();
@endphp

<x-app-layout title="{{ $drug->name }}">
    <x-page-header
        title="{{ $drug->name }}"
        subtitle="{{ $drug->generic_name }}@if ($drug->brand_name) · marketed as {{ $drug->brand_name }}@endif"
        icon="pill"
        :back="route('drugs.index')"
        backLabel="Formulary">
        <x-slot:meta>
            <span class="font-mono text-xs text-slate-500">{{ $drug->code }}</span>
            <x-status-badge field="drug_form" :value="$drug->form" size="sm" />
            @if ($drug->strength)
                <span class="text-xs text-slate-500">{{ $drug->strength }}</span>
            @endif
            @foreach ($safety as [$icon, $tone, $label])
                <span class="inline-flex items-center gap-1 text-xs font-medium {{ $tone }}">
                    <x-icon :name="$icon" size="xs" /> {{ $label }}
                </span>
            @endforeach
        </x-slot:meta>

        <x-slot:actions>
            @can('drugs.manage')
                <a href="{{ route('drugs.edit', $drug) }}" class="hms-btn-secondary">
                    <x-icon name="edit" size="sm" />
                    Amend
                </a>
            @endcan
            @can('prescriptions.create')
                <a href="{{ route('prescriptions.create') }}" class="hms-btn-primary">
                    <x-icon name="clipboard-check" size="sm" />
                    Write prescription
                </a>
            @endcan
        </x-slot:actions>
    </x-page-header>

    @if ($stock !== null && $stock <= 0)
        <x-alert type="warning" title="Out of stock">
            {{ $drug->display_name }} is linked to the shelf but nothing is on it — the counter cannot dispense until a batch is received.
        </x-alert>
    @elseif ($lowStock)
        <x-alert type="warning" title="Below reorder level">
            {{ number_format($item->quantity_on_hand) }} {{ $item->unit }} on hand against a reorder level of {{ number_format($item->reorder_level) }}.
        </x-alert>
    @endif

    <div class="grid gap-6 lg:grid-cols-3">
        <div class="space-y-6 lg:col-span-2">
            <x-card title="The entry" icon="book">
                <dl class="hms-dl grid gap-x-6 gap-y-4 sm:grid-cols-2">
                    <div>
                        <dt>Formulary code</dt>
                        <dd class="font-mono">{{ $drug->code }}</dd>
                    </div>
                    <div>
                        <dt>Default route</dt>
                        <dd>{{ $drug->route_label }}</dd>
                    </div>
                    <div>
                        <dt>Therapeutic class</dt>
                        <dd>{{ $drug->therapeutic_class ?? '—' }}</dd>
                    </div>
                    <div>
                        <dt>Pharmacological class</dt>
                        <dd>{{ $drug->pharmacological_class ?? '—' }}</dd>
                    </div>
                    <div>
                        <dt>Pregnancy category</dt>
                        <dd>
                            {{ $drug->pregnancy_category ? strtoupper($drug->pregnancy_category) : '—' }}
                            @if ($drug->is_pregnancy_safe)
                                <span class="text-xs text-emerald-600">· safe in pregnancy</span>
                            @endif
                            @if ($drug->is_breastfeeding_safe)
                                <span class="text-xs text-emerald-600">· safe while breastfeeding</span>
                            @endif
                        </dd>
                    </div>
                    <div>
                        <dt>Storage</dt>
                        <dd>{{ $drug->storage_conditions ?? $item?->storage_conditions ?? '—' }}</dd>
                    </div>
                </dl>
            </x-card>

            <x-card title="Prescribing defaults" icon="clipboard-list">
                <dl class="hms-dl grid gap-x-6 gap-y-4 sm:grid-cols-2 lg:grid-cols-3">
                    <div>
                        <dt>Adult dose</dt>
                        <dd>{{ $drug->adult_dose ?? '—' }}</dd>
                    </div>
                    <div>
                        <dt>Paediatric dose</dt>
                        <dd>{{ $drug->pediatric_dose ?? '—' }}</dd>
                    </div>
                    <div>
                        <dt>Maximum daily dose</dt>
                        <dd>{{ $drug->max_daily_dose ?? '—' }}</dd>
                    </div>
                    <div>
                        <dt>Default frequency</dt>
                        <dd>{{ lookup_label('drug_frequency', $drug->default_frequency) }}</dd>
                    </div>
                    <div>
                        <dt>Default course</dt>
                        <dd>{{ $drug->default_duration_days ? $drug->default_duration_days.' day'.((int) $drug->default_duration_days === 1 ? '' : 's') : '—' }}</dd>
                    </div>
                    @if ($drug->prescription_notes)
                        <div class="sm:col-span-2 lg:col-span-3">
                            <dt>Note shown when prescribing</dt>
                            <dd>{{ $drug->prescription_notes }}</dd>
                        </div>
                    @endif
                </dl>
            </x-card>

            @if ($drug->indications || $drug->contraindications || $drug->side_effects || $drug->drug_interactions || $drug->precautions)
                <x-card title="Monograph" icon="book-open">
                    <div class="space-y-4">
                        @foreach ([
                            'Indications' => $drug->indications,
                            'Contraindications' => $drug->contraindications,
                            'Side effects' => $drug->side_effects,
                            'Interactions' => $drug->drug_interactions,
                            'Precautions' => $drug->precautions,
                        ] as $heading => $body)
                            @if ($body)
                                <div>
                                    <h3 class="text-xs font-semibold uppercase tracking-wide text-slate-400">{{ $heading }}</h3>
                                    <p class="mt-1 whitespace-pre-line text-sm text-slate-600">{{ $body }}</p>
                                </div>
                            @endif
                        @endforeach
                    </div>
                </x-card>
            @endif

            @if ($item)
                <x-card title="Batches on the shelf" icon="cube" :padded="false">
                    <x-slot:header>
                        Shortest-dated first — what the pharmacy reaches for under FEFO.
                    </x-slot:header>

                    @if ($item->batches->isEmpty())
                        <div class="px-5 py-8">
                            <x-empty-state icon="cube" title="No batches on the shelf"
                                           message="Nothing has been received against this item yet — the counter cannot dispense until a batch lands." />
                        </div>
                    @else
                        <div class="overflow-x-auto">
                            <table class="hms-table">
                                <thead>
                                    <tr>
                                        <th>Batch</th>
                                        <th>Expiry</th>
                                        <th class="text-right">Available</th>
                                        <th class="text-right">Cost</th>
                                        <th class="text-right">Price</th>
                                        <th>Status</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    @foreach ($item->batches as $batch)
                                        <tr>
                                            <td class="font-mono text-xs">{{ $batch->batch_number }}</td>
                                            <td class="text-sm">
                                                @if ($batch->expiry_date)
                                                    <span class="{{ $batch->days_to_expiry < 90 ? 'text-amber-700' : 'text-slate-700' }}">
                                                        {{ $batch->expiry_date->format('d M Y') }}
                                                    </span>
                                                    <span class="block text-xs text-slate-400">{{ $batch->days_to_expiry }} days</span>
                                                @else
                                                    <span class="text-slate-400">No date</span>
                                                @endif
                                            </td>
                                            <td class="text-right text-sm">{{ number_format($batch->quantity_available) }}</td>
                                            <td class="text-right text-sm">{{ money($batch->unit_cost, false) }}</td>
                                            <td class="text-right text-sm">{{ money($batch->selling_price, false) }}</td>
                                            <td>
                                                <x-status-badge field="batch_status" :value="$batch->status" size="sm" />
                                            </td>
                                        </tr>
                                    @endforeach
                                </tbody>
                            </table>
                        </div>
                    @endif
                </x-card>
            @endif
        </div>

        <div class="space-y-6">
            <x-card title="On the shelf" icon="cube">
                @if ($item)
                    <dl class="hms-dl space-y-3">
                        <div>
                            <dt>Item</dt>
                            <dd>{{ $item->name }}</dd>
                        </div>
                        <div>
                            <dt>On hand</dt>
                            <dd class="{{ $item->quantity_on_hand <= 0 ? 'text-amber-700' : '' }}">
                                {{ number_format($item->quantity_on_hand) }} {{ $item->unit }}
                            </dd>
                        </div>
                        <div>
                            <dt>Reorder level</dt>
                            <dd>{{ $item->reorder_level !== null ? number_format($item->reorder_level).' '.$item->unit : '—' }}</dd>
                        </div>
                        <div>
                            <dt>Selling price</dt>
                            <dd>{{ $item->selling_price !== null ? money($item->selling_price) : '—' }}</dd>
                        </div>
                    </dl>
                @else
                    <p class="text-sm text-slate-600">
                        Not linked to a shelf item — the drug can be written on a script, but the pharmacy
                        cannot hand it over from stock until it is linked in administration.
                    </p>
                @endif
            </x-card>

            <x-card title="How it is used" icon="chart-bar">
                <dl class="hms-dl space-y-3">
                    <div>
                        <dt>Prescription lines</dt>
                        <dd>{{ number_format($prescribedLines) }}</dd>
                    </div>
                    <div>
                        <dt>Availability</dt>
                        <dd>{{ $drug->is_active ? 'Available for new scripts' : 'Retired — past scripts only' }}</dd>
                    </div>
                </dl>
            </x-card>
        </div>
    </div>
</x-app-layout>