@extends('layouts.app')

@section('title', 'New Transfer')

@push('styles')
<style>
    .page-header {
        display: flex; align-items: center; justify-content: space-between;
        margin-bottom: 1.5rem; flex-wrap: wrap; gap: 1rem;
    }
    .page-header h1 { font-size: 1.5rem; font-weight: 700; }
    .page-header p { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.25rem; }

    .btn-primary {
        display: inline-flex; align-items: center; gap: 0.5rem;
        padding: 0.625rem 1rem; background: var(--accent); color: #fff;
        border: 1px solid var(--accent); border-radius: var(--radius-md);
        font-size: 0.875rem; font-weight: 500; font-family: inherit;
        text-decoration: none; cursor: pointer; transition: opacity var(--transition);
    }
    .btn-primary:hover { opacity: 0.9; }

    .btn-outline {
        display: inline-flex; align-items: center; gap: 0.5rem;
        padding: 0.625rem 1rem; background: transparent; color: var(--text-secondary);
        border: 1px solid var(--border); border-radius: var(--radius-md);
        font-size: 0.875rem; font-weight: 500; text-decoration: none; cursor: pointer;
        transition: all var(--transition);
    }
    .btn-outline:hover { background: var(--bg-hover); color: var(--text-primary); }

    .btn-ghost {
        display: inline-flex; align-items: center; gap: 0.375rem;
        padding: 0.4rem 0.7rem; background: transparent; color: var(--accent);
        border: 1px dashed var(--accent); border-radius: var(--radius-md);
        font-size: 0.8rem; font-weight: 500; cursor: pointer; font-family: inherit;
        transition: all var(--transition);
    }
    .btn-ghost:hover { background: rgba(16, 191, 255, 0.08); }

    .btn-remove {
        background: transparent; border: 1px solid var(--border);
        color: var(--danger); width: 36px; height: 36px;
        border-radius: var(--radius-md); cursor: pointer;
        display: inline-flex; align-items: center; justify-content: center;
        transition: all var(--transition);
    }
    .btn-remove:hover { background: rgba(239, 68, 68, 0.1); border-color: var(--danger); }

    .form-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }

    .form-section {
        background: var(--bg-card); border: 1px solid var(--border);
        border-radius: var(--radius-lg); padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
    .form-section h3 {
        font-size: 0.95rem; font-weight: 600; color: var(--text-primary);
        margin-bottom: 1.25rem; padding-bottom: 0.75rem;
        border-bottom: 1px solid var(--border);
        display: flex; align-items: center; gap: 0.5rem;
    }

    .form-group { margin-bottom: 1rem; }
    .form-group label {
        display: block; font-size: 0.8rem; font-weight: 500;
        color: var(--text-secondary); margin-bottom: 0.375rem;
    }
    .form-group .required { color: var(--danger); margin-left: 2px; }

    .form-input, .form-select, .form-textarea {
        width: 100%;
        padding: 0.625rem 0.875rem;
        border: 1px solid var(--border); border-radius: var(--radius-md);
        background: var(--bg-secondary); color: var(--text-primary);
        font-family: inherit; font-size: 0.875rem; outline: none;
        transition: border-color var(--transition);
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus { border-color: var(--accent); }
    .form-textarea { resize: vertical; min-height: 90px; }

    .form-error { color: var(--danger); font-size: 0.75rem; margin-top: 0.25rem; }

    .items-wrap { display: flex; flex-direction: column; gap: 0.75rem; }
    .item-row {
        display: grid;
        grid-template-columns: 2fr 1fr auto;
        gap: 0.75rem;
        align-items: end;
        padding: 0.875rem;
        background: var(--bg-secondary);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
    }
    .item-row .form-group { margin: 0; }
    .item-row label { font-size: 0.7rem; }

    .form-actions {
        display: flex; gap: 0.75rem; justify-content: flex-end;
        margin-top: 1.5rem;
    }

    .alert-error {
        background: rgba(239, 68, 68, 0.1);
        border: 1px solid rgba(239, 68, 68, 0.3);
        color: var(--danger);
        padding: 0.875rem 1rem;
        border-radius: var(--radius-md);
        margin-bottom: 1.25rem;
        font-size: 0.85rem;
    }
    .alert-error ul { margin: 0.25rem 0 0 1.25rem; padding: 0; }

    @media (max-width: 900px) {
        .form-grid { grid-template-columns: 1fr; }
        .item-row { grid-template-columns: 1fr; }
    }
</style>
@endpush

@section('content')
    <div class="page-header">
        <div>
            <h1>New Stock Transfer</h1>
            <p>Move inventory between locations. Stock is reserved at the source until received.</p>
        </div>
        <a href="{{ route('inventory.transfers.index') }}" class="btn-outline">
            <i class="fas fa-arrow-left"></i> Back
        </a>
    </div>

    @if($errors->any())
        <div class="alert-error">
            <strong>Please fix the following:</strong>
            <ul>
                @foreach($errors->all() as $err)
                    <li>{{ $err }}</li>
                @endforeach
            </ul>
        </div>
    @endif

    <form method="POST" action="{{ route('inventory.transfers.store') }}" id="transferForm">
        @csrf

        <div class="form-section">
            <h3><i class="fas fa-route"></i> Transfer Route</h3>

            <div class="form-grid">
                <div class="form-group">
                    <label>From Location <span class="required">*</span></label>
                    <select name="from_location_id" id="fromLoc" class="form-select" required>
                        <option value="">— Select source —</option>
                        @foreach($locations as $loc)
                            <option value="{{ $loc->id }}" {{ old('from_location_id') == $loc->id ? 'selected' : '' }}>
                                {{ $loc->name }}
                            </option>
                        @endforeach
                    </select>
                    @error('from_location_id')<div class="form-error">{{ $message }}</div>@enderror
                </div>

                <div class="form-group">
                    <label>To Location <span class="required">*</span></label>
                    <select name="to_location_id" id="toLoc" class="form-select" required>
                        <option value="">— Select destination —</option>
                        @foreach($locations as $loc)
                            <option value="{{ $loc->id }}" {{ old('to_location_id') == $loc->id ? 'selected' : '' }}>
                                {{ $loc->name }}
                            </option>
                        @endforeach
                    </select>
                    @error('to_location_id')<div class="form-error">{{ $message }}</div>@enderror
                </div>
            </div>

            <div class="form-group">
                <label>Notes</label>
                <textarea name="notes" class="form-textarea" placeholder="Optional notes about this transfer">{{ old('notes') }}</textarea>
                @error('notes')<div class="form-error">{{ $message }}</div>@enderror
            </div>
        </div>

        <div class="form-section">
            <h3><i class="fas fa-boxes"></i> Items</h3>

            <div id="itemsWrap" class="items-wrap">
                @php $oldItems = old('items', []); @endphp
                @if(!empty($oldItems))
                    @foreach($oldItems as $i => $oi)
                        <div class="item-row" data-index="{{ $i }}">
                            <div class="form-group">
                                <label>Product</label>
                                <select name="items[{{ $i }}][product_id]" class="form-select" required>
                                    <option value="">— Select product —</option>
                                    @foreach($products as $product)
                                        <option value="{{ $product->id }}" {{ ($oi['product_id'] ?? '') == $product->id ? 'selected' : '' }}>
                                            {{ $product->name }}@if(!empty($product->sku)) ({{ $product->sku }})@endif
                                        </option>
                                    @endforeach
                                </select>
                            </div>
                            <div class="form-group">
                                <label>Quantity</label>
                                <input type="number" name="items[{{ $i }}][quantity]" class="form-input" min="1" value="{{ $oi['quantity'] ?? 1 }}" required>
                            </div>
                            <button type="button" class="btn-remove" onclick="removeItem(this)" title="Remove">
                                <i class="fas fa-trash"></i>
                            </button>
                        </div>
                    @endforeach
                @endif
            </div>

            <template id="itemTpl">
                <div class="item-row" data-index="__I__">
                    <div class="form-group">
                        <label>Product</label>
                        <select name="items[__I__][product_id]" class="form-select" required>
                            <option value="">— Select product —</option>
                            @foreach($products as $product)
                                <option value="{{ $product->id }}">{{ $product->name }}@if(!empty($product->sku)) ({{ $product->sku }})@endif</option>
                            @endforeach
                        </select>
                    </div>
                    <div class="form-group">
                        <label>Quantity</label>
                        <input type="number" name="items[__I__][quantity]" class="form-input" min="1" value="1" required>
                    </div>
                    <button type="button" class="btn-remove" onclick="removeItem(this)" title="Remove">
                        <i class="fas fa-trash"></i>
                    </button>
                </div>
            </template>

            <div style="margin-top: 1rem;">
                <button type="button" class="btn-ghost" onclick="addItem()">
                    <i class="fas fa-plus"></i> Add Item
                </button>
            </div>
        </div>

        <div class="form-actions">
            <a href="{{ route('inventory.transfers.index') }}" class="btn-outline">Cancel</a>
            <button type="submit" class="btn-primary">
                <i class="fas fa-paper-plane"></i> Create Transfer
            </button>
        </div>
    </form>
@endsection

@push('scripts')
<script>
    (function () {
        let itemIndex = {{ count(old('items', [])) }};
        const wrap = document.getElementById('itemsWrap');
        const tpl = document.getElementById('itemTpl');

        window.addItem = function () {
            const html = tpl.innerHTML.replaceAll('__I__', itemIndex);
            const div = document.createElement('div');
            div.innerHTML = html.trim();
            wrap.appendChild(div.firstElementChild);
            itemIndex++;
        };

        window.removeItem = function (btn) {
            const row = btn.closest('.item-row');
            if (row) row.remove();
        };

        if (wrap.children.length === 0) addItem();

        const fromSel = document.getElementById('fromLoc');
        const toSel = document.getElementById('toLoc');
        function validateRoute() {
            if (fromSel.value && toSel.value && fromSel.value === toSel.value) {
                toSel.setCustomValidity('Destination must differ from source.');
            } else {
                toSel.setCustomValidity('');
            }
        }
        fromSel.addEventListener('change', validateRoute);
        toSel.addEventListener('change', validateRoute);
    })();
</script>
@endpush