{{--
    Standard HMIS department dropdown options.

    Renders the canonical 8 main departments + the Specialized
    Clinics submenu (as <optgroup>) in one consistent order:

        Outpatient · Laboratory · Radiology · Inpatient ·
        Maternity · Dental · MCH / FP · Specialized Clinics
            └── Diabetes / Gynecology / Hypertension /
                Orthopedic / Pediatric / Physiotherapy /
                Psychiatric Clinic

    The partial fetches its own data via Department::activeGrouped()
    and caches per request, so no controller needs to be changed for
    the dropdown to work consistently across the system.

    Usage in any parent <select>:

        <select name="department_id" class="form-input">
            <option value="">Select department</option>
            @include('partials._department-options', [
                'selected'      => $appointment->department_id ?? null, // optional
                'matchCode'     => 'OPD',                               // optional
                'flat'          => false,                               // optional
                'excludeDirect' => false,                               // optional
            ])
        </select>

    Variables (all optional):
        $selected      id of the currently selected department, used to
                       apply the `selected` attribute
        $matchCode     pre-select by code (e.g. 'OPD') when no $selected
                       id is provided — handy for "new visit" forms that
                       default to Outpatient
        $flat          true to render every department in a single flat
                       list (children indented with non-breaking spaces),
                       no <optgroup>. Use this for filter dropdowns where
                       a single tap should let the receptionist pick a
                       specific sub-clinic without expanding the group.
        $excludeDirect true to hide Laboratory and Radiology. Pass this
                       on any OPD / ANC / consultation context where the
                       department dropdown lets the user CORRECT the
                       routing of an existing encounter. Lab and
                       Radiology are not valid corrections in those
                       contexts because choosing them would require
                       creating a completely different direct-encounter
                       visit type — that flow lives on the queue page's
                       "Start New Visit" modal, not on the encounter
                       form itself.
--}}
@php
    $selected      = $selected      ?? null;
    $matchCode     = $matchCode     ?? null;
    $flat          = $flat          ?? false;
    $excludeDirect = $excludeDirect ?? false;

    // Codes that the excludeDirect flag should strip from the list.
    // These map to the encounter types that have their own dedicated
    // workflow (direct_lab / direct_radiology) and are not valid
    // routings for a consultation visit.
    $excludedCodes = $excludeDirect ? ['LAB', 'RAD'] : [];

    // Memoise the full tree per request — the partial is rendered on
    // lots of pages and there is no point re-querying for each form.
    // The same memo is used regardless of $excludeDirect: we just
    // filter at render time below, which is cheap.
    static $deptTree = null;
    if ($deptTree === null) {
        $deptTree = \App\Models\Department::activeGrouped();
    }

    $isSelected = function ($dept) use ($selected, $matchCode) {
        if ($selected !== null && $selected !== '') {
            return (int) $selected === (int) $dept->id;
        }
        if ($matchCode !== null) {
            return $dept->code === $matchCode;
        }
        return false;
    };
@endphp

@foreach($deptTree as $dept)
    @continue(in_array($dept->code, $excludedCodes, true))
    @if($dept->children->isNotEmpty() && ! $flat)
        {{-- Specialized Clinics: parent is selectable AND opens an
             optgroup of children, so a clinician can either book
             into "Specialized Clinics" generically or pick a specific
             sub-clinic. --}}
        <option value="{{ $dept->id }}" data-code="{{ $dept->code }}" {{ $isSelected($dept) ? 'selected' : '' }}>
            {{ $dept->name }}
        </option>
        <optgroup label="— {{ $dept->name }} —">
            @foreach($dept->children as $child)
                @continue(in_array($child->code, $excludedCodes, true))
                <option value="{{ $child->id }}" data-code="{{ $child->code }}" {{ $isSelected($child) ? 'selected' : '' }}>
                    {{ $child->name }}
                </option>
            @endforeach
        </optgroup>
    @else
        <option value="{{ $dept->id }}" data-code="{{ $dept->code }}" {{ $isSelected($dept) ? 'selected' : '' }}>
            {{ $dept->name }}
        </option>
        @if($flat && $dept->children->isNotEmpty())
            @foreach($dept->children as $child)
                @continue(in_array($child->code, $excludedCodes, true))
                <option value="{{ $child->id }}" data-code="{{ $child->code }}" {{ $isSelected($child) ? 'selected' : '' }}>
                    &nbsp;&nbsp;{{ $child->name }}
                </option>
            @endforeach
        @endif
    @endif
@endforeach