@extends('layouts.app')
@section('title','New vs Revisit Patients')
@section('content')

<h1 class="text-lg font-bold text-gray-900 mb-1">New vs Returning Patients</h1>
<p class="text-xs text-gray-500 mb-3">
    {{ $from->format('d M Y') }} — {{ $to->format('d M Y') }}
</p>
@include('reports._date-filter')

{{-- ═══ CARDS ═══════════════════════════════════════════════════════════
     Layout: New + Returning = unique patients seen. Total visits is a
     separate dimension (some patients have multiple visits). --}}
<div class="grid grid-cols-1 md:grid-cols-3 gap-3 mb-4">
    <div class="stat-card" title="Patients whose FIRST-EVER visit to the hospital fell inside this window. New to the system.">
        <p class="text-xs text-gray-400 uppercase">New Patients</p>
        <p class="text-xl font-bold text-green-600">{{ number_format($newPatients) }}</p>
        <p class="text-[11px] text-gray-400 mt-1">First-ever visit in window</p>
    </div>
    <div class="stat-card" title="Patients who visited in this window AND had at least one prior visit before the window. Returning to the hospital.">
        <p class="text-xs text-gray-400 uppercase">Returning Patients</p>
        <p class="text-xl font-bold text-blue-600">{{ number_format($revisits) }}</p>
        <p class="text-[11px] text-gray-400 mt-1">Visited before the window</p>
    </div>
    <div class="stat-card" title="Total visit rows in the window. Includes multiple visits by the same patient.">
        <p class="text-xs text-gray-400 uppercase">Total Visits</p>
        <p class="text-xl font-bold">{{ number_format($totalVisits) }}</p>
        <p class="text-[11px] text-gray-400 mt-1">All visit rows in window</p>
    </div>
</div>

{{-- ═══ INTERPRETATION HELPER ═══════════════════════════════════════════
     This is a non-trivial set of definitions, so a small panel
     explaining the relationships saves a lot of "why does X not
     equal Y" questions. --}}
@php
    $uniquePatients = $newPatients + $revisits;
    $newPct  = $uniquePatients > 0 ? round(($newPatients / $uniquePatients) * 100, 1) : 0;
    $retPct  = $uniquePatients > 0 ? round(($revisits / $uniquePatients) * 100, 1)    : 0;
@endphp
<div class="bg-gray-50 border border-gray-200 rounded-lg p-3 mb-4 text-xs text-gray-700">
    <p class="leading-snug">
        <strong>Unique patients seen:</strong> {{ number_format($uniquePatients) }}
        ({{ number_format($newPatients) }} new + {{ number_format($revisits) }} returning).
        New = {{ $newPct }}% · Returning = {{ $retPct }}%.
        @if($totalVisits > $uniquePatients)
        Some patients had multiple visits (total visits {{ number_format($totalVisits) }} > unique patients {{ number_format($uniquePatients) }}).
        @endif
    </p>
</div>

{{-- ═══ DEFINITIONS BLOCK ═════════════════════════════════════════════
     Inline glossary. Hidden in print. --}}
<div class="bg-white border border-gray-100 rounded-xl p-4 text-xs text-gray-600 no-print">
    <h3 class="text-sm font-bold text-gray-700 mb-2">Definitions</h3>
    <dl class="space-y-2">
        <div>
            <dt class="font-semibold text-gray-700">New Patient</dt>
            <dd class="text-gray-500">A patient whose <em>first-ever</em> visit to this hospital fell inside the selected window. The patient may have been registered earlier — what counts here is when they first walked in to receive care.</dd>
        </div>
        <div>
            <dt class="font-semibold text-gray-700">Returning Patient</dt>
            <dd class="text-gray-500">A patient who visited inside the window AND has at least one earlier visit on record (before the window). They were already in the system before this period.</dd>
        </div>
        <div>
            <dt class="font-semibold text-gray-700">Total Visits</dt>
            <dd class="text-gray-500">Every visit row created inside the window — including multiple visits by the same patient. New + Returning counts each <em>patient</em> once; Total Visits counts each <em>encounter</em>.</dd>
        </div>
    </dl>
</div>
@endsection