@extends('layouts.app')
@section('title', 'Edit ' . $purchaseOrder->po_number)
@section('breadcrumb')<a href="{{ route('purchase-orders.index') }}" class="hover:text-white">Purchase Orders</a> <i class="fas fa-chevron-right text-xs mx-1 text-slate-600"></i> <a href="{{ route('purchase-orders.show', $purchaseOrder) }}" class="hover:text-white">{{ $purchaseOrder->po_number }}</a> <i class="fas fa-chevron-right text-xs mx-1 text-slate-600"></i> <span class="text-white">Edit</span>@endsection

@section('content')
@php
$units = ['Each','m','m²','m³','Sheet','Pack','Box','Set','Pair','Roll','L','kg','Bag','Panel','Slab'];
@endphp
<div class="max-w-4xl mx-auto">
<form method="POST" action="{{ route('purchase-orders.update', $purchaseOrder) }}" class="space-y-6" x-data="poEdit()">
    @csrf
    @method('PUT')

    @if($errors->any())
    <div class="card p-4 border-red-500 bg-red-900/20">
        <ul class="text-red-400 text-sm space-y-1">@foreach($errors->all() as $e)<li><i class="fas fa-exclamation-circle mr-1"></i>{{ $e }}</li>@endforeach</ul>
    </div>
    @endif

    <div class="card p-5">
        <h3 class="mb-4"><i class="fas fa-file-invoice text-blue-400 mr-2"></i>Purchase Order Details</h3>
        <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div>
                <label>PO Number *</label>
                <input type="text" name="po_number" value="{{ old('po_number', $purchaseOrder->po_number) }}" class="input" required>
            </div>
            <div>
                <label>Supplier</label>
                <select name="supplier_id" class="input">
                    <option value="">— Select Supplier —</option>
                    @foreach($suppliers as $s)
                    <option value="{{ $s->id }}" {{ old('supplier_id', $purchaseOrder->supplier_id)==$s->id ? 'selected' : '' }}>{{ $s->company ?: $s->full_name }}</option>
                    @endforeach
                </select>
            </div>
            <div>
                <label>Order Date</label>
                <input type="date" name="order_date" value="{{ old('order_date', $purchaseOrder->order_date?->format('Y-m-d')) }}" class="input">
            </div>
            <div>
                <label>Expected Delivery</label>
                <input type="date" name="expected_date" value="{{ old('expected_date', $purchaseOrder->expected_date?->format('Y-m-d')) }}" class="input">
            </div>
            <div>
                <label>Status</label>
                <select name="status" class="input">
                    @foreach(['draft'=>'Draft','ordered'=>'Ordered','partial'=>'Partial (Receiving)','cancelled'=>'Cancelled'] as $k=>$v)
                    <option value="{{ $k }}" {{ old('status', $purchaseOrder->status)===$k ? 'selected' : '' }}>{{ $v }}</option>
                    @endforeach
                </select>
            </div>
            <div>
                <label>Reference / Invoice #</label>
                <input type="text" name="reference" value="{{ old('reference', $purchaseOrder->reference) }}" class="input" placeholder="Supplier reference...">
            </div>
            <div class="md:col-span-2">
                <label>Notes</label>
                <textarea name="notes" rows="2" class="input">{{ old('notes', $purchaseOrder->notes) }}</textarea>
            </div>
        </div>
    </div>

    <div class="card p-5">
        <div class="flex items-center justify-between mb-4">
            <h3><i class="fas fa-list text-slate-400 mr-2"></i>Line Items</h3>
            <button type="button" @click="addRow()" class="btn btn-secondary text-xs py-1.5 px-3">
                <i class="fas fa-plus mr-1"></i> Add Row
            </button>
        </div>

        <div class="overflow-x-auto">
            <table class="w-full text-sm">
                <thead>
                    <tr class="text-xs text-slate-400 border-b border-slate-700">
                        <th class="py-2 text-left pr-2" style="min-width:160px">Description *</th>
                        <th class="py-2 text-left pr-2" style="min-width:160px">Item Name</th>
                        <th class="py-2 text-left pr-2" style="min-width:130px">SKU</th>
                        <th class="py-2 text-left pr-2" style="width:100px">Unit</th>
                        <th class="py-2 text-right pr-2" style="width:80px">Qty *</th>
                        <th class="py-2 text-right pr-2" style="width:110px">Unit Cost *</th>
                        <th class="py-2 text-right pr-2" style="width:90px">Total</th>
                        <th class="py-2" style="width:30px"></th>
                    </tr>
                </thead>
                <tbody>
                    <template x-for="(row, i) in rows" :key="i">
                        <tr class="border-b border-slate-800">
                            <td class="py-2 pr-2">
                                <input type="text" :name="'items['+i+'][description]'" x-model="row.description" class="input text-sm py-1.5" required>
                            </td>
                            <td class="py-2 pr-2">
                                <input type="text" :name="'items['+i+'][item_name]'" x-model="row.item_name" class="input text-sm py-1.5" placeholder="e.g. Cabinet Panel">
                            </td>
                            <td class="py-2 pr-2">
                                <input type="text" :name="'items['+i+'][sku]'" x-model="row.sku" @change="checkSkuUnique(i)" class="input text-sm py-1.5" :class="row.skuExists ? 'border-yellow-500' : ''" placeholder="e.g. CAB-001">
                                <div x-show="row.skuExists" class="text-xs text-yellow-400 mt-0.5"><i class="fas fa-exclamation-triangle mr-1"></i>SKU already in inventory</div>
                            </td>
                            <td class="py-2 pr-2">
                                <select :name="'items['+i+'][unit]'" x-model="row.unit" class="input text-sm py-1.5">
                                    @foreach($units as $u)
                                    <option value="{{ $u }}">{{ $u }}</option>
                                    @endforeach
                                </select>
                            </td>
                            <td class="py-2 pr-2">
                                <input type="number" :name="'items['+i+'][qty_ordered]'" x-model="row.qty" @input="recalc(i)" class="input text-sm py-1.5 text-right" step="1" min="1" required>
                            </td>
                            <td class="py-2 pr-2">
                                <input type="number" :name="'items['+i+'][unit_cost]'" x-model="row.unit_cost" @input="recalc(i)" class="input text-sm py-1.5 text-right" step="0.01" min="0" required>
                            </td>
                            <td class="py-2 pr-2 text-right text-white font-medium" x-text="'$' + Number(row.total).toFixed(2)"></td>
                            <td class="py-2">
                                <button type="button" @click="removeRow(i)" class="text-slate-500 hover:text-red-400 text-xs" x-show="rows.length > 1">
                                    <i class="fas fa-times"></i>
                                </button>
                            </td>
                        </tr>
                    </template>
                </tbody>
                <tfoot>
                    <tr>
                        <td colspan="6" class="pt-3 text-right text-slate-400 text-sm font-medium pr-2">Total:</td>
                        <td class="pt-3 text-right text-white font-bold pr-2" x-text="'$' + grandTotal()"></td>
                        <td></td>
                    </tr>
                </tfoot>
            </table>
        </div>
    </div>

    <div class="flex items-center justify-between">
        <a href="{{ route('purchase-orders.show', $purchaseOrder) }}" class="btn btn-secondary">
            <i class="fas fa-arrow-left mr-2"></i>Cancel
        </a>
        <button type="submit" class="btn btn-primary">
            <i class="fas fa-save mr-2"></i>Save Changes
        </button>
    </div>
</form>
</div>

@php
$existingItemsJson = json_encode($purchaseOrder->items->map(fn($item) => [
    'description' => $item->description,
    'item_name'   => $item->item_name ?? '',
    'sku'         => $item->sku ?? '',
    'unit'        => $item->unit ?? 'Each',
    'qty'         => (int) $item->qty_ordered,
    'unit_cost'   => (float) $item->unit_cost,
    'total'       => (float) $item->total_cost,
])->values());
@endphp
<script>
const inventorySkus = @json($inventorySkus ?? []);
function poEdit() {
    const existing = {!! $existingItemsJson !!};
    return {
        rows: existing.length ? existing.map(r => ({...r, skuExists: false})) : [{ description: '', item_name: '', sku: '', unit: 'Each', qty: 1, unit_cost: 0, total: 0, skuExists: false }],
        addRow() { this.rows.push({ description: '', item_name: '', sku: '', unit: 'Each', qty: 1, unit_cost: 0, total: 0, skuExists: false }); },
        removeRow(i) { if (this.rows.length > 1) this.rows.splice(i, 1); },
        checkSkuUnique(i) {
            const sku = (this.rows[i].sku || '').trim();
            if (!sku) { this.rows[i].skuExists = false; return; }
            this.rows[i].skuExists = inventorySkus.includes(sku);
        },
        recalc(i) {
            const r = this.rows[i];
            r.total = Math.round(parseInt(r.qty || 0) * parseFloat(r.unit_cost || 0) * 100) / 100;
        },
        grandTotal() {
            return this.rows.reduce((s, r) => s + parseFloat(r.total || 0), 0).toFixed(2);
        },
    };
}
</script>
@endsection