@extends('layouts.app')

@section('title', 'Edit Invoice')
@section('page-title', 'Edit Invoice 🧾')
@section('page-subtitle', $invoice->invoice_number)

@section('content')
<div class="max-w-3xl mx-auto">
    <div class="cat-card p-4 lg:p-8" x-data="invoiceEditForm()">
        <form action="{{ route('invoices.update', $invoice) }}" method="POST" enctype="multipart/form-data">
            @csrf @method('PUT')

            {{-- Header fields --}}
            <div class="grid grid-cols-1 sm:grid-cols-2 gap-3 mb-5">
                <div class="sm:col-span-2">
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Invoice Title</label>
                    <input type="text" name="title" value="{{ old('title', $invoice->title) }}" class="input-soft" required>
                </div>
                <div>
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Client</label>
                    <select name="client_id" class="input-soft">
                        <option value="">— No client —</option>
                        @foreach($clients as $client)
                            <option value="{{ $client->id }}" {{ old('client_id', $invoice->client_id) == $client->id ? 'selected' : '' }}>{{ $client->name }}</option>
                        @endforeach
                    </select>
                </div>
                <div>
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Status</label>
                    <select name="status" class="input-soft">
                        @foreach($statuses as $s)
                            <option value="{{ $s->value }}" {{ old('status', $invoice->status->value) === $s->value ? 'selected' : '' }}>{{ $s->label() }}</option>
                        @endforeach
                    </select>
                </div>
                <div>
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Issue Date</label>
                    <input type="date" name="issue_date" value="{{ old('issue_date', $invoice->issue_date->toDateString()) }}" class="input-soft">
                </div>
                <div>
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Due Date</label>
                    <input type="date" name="due_date" value="{{ old('due_date', $invoice->due_date->toDateString()) }}" class="input-soft">
                </div>
                <div>
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Paid Date</label>
                    <input type="date" name="paid_date" value="{{ old('paid_date', $invoice->paid_date?->toDateString()) }}" class="input-soft">
                </div>
                <div>
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Tax Rate (%)</label>
                    <input type="number" name="tax_rate" x-model="taxRate" @input="recalc()"
                           value="{{ old('tax_rate', $invoice->tax_rate) }}" class="input-soft" step="0.01">
                </div>
            </div>

            {{-- Line Items --}}
            <div class="mb-5">
                <div class="flex items-center justify-between mb-3">
                    <h3 class="text-sm font-bold text-gray-700">Line Items</h3>
                    <button type="button" @click="addItem()" class="btn-sakura text-xs py-1.5 px-4">＋ Add Item</button>
                </div>

                <div class="space-y-2">
                    <template x-for="(item, index) in items" :key="index">
                        <div class="bg-pink-50 rounded-2xl p-3">
                            <input type="text" :name="`items[${index}][description]`"
                                   x-model="item.description"
                                   class="input-soft text-sm mb-2 bg-white"
                                   placeholder="Service description" required>
                            <div class="flex gap-2 items-center">
                                <div class="w-16 shrink-0">
                                    <label class="text-xs text-gray-400 block mb-0.5">Qty</label>
                                    <input type="number" :name="`items[${index}][quantity]`"
                                           x-model.number="item.quantity" @input="recalc()"
                                           class="input-soft text-sm text-center bg-white px-2" min="1">
                                </div>
                                <div class="flex-1">
                                    <label class="text-xs text-gray-400 block mb-0.5">Unit Price</label>
                                    <input type="hidden" :name="`items[${index}][unit_price]`" :value="item.unit_price">
                                    <input type="text"
                                        :value="item.unit_price ? formatNum(item.unit_price) : ''"
                                        @input="
                                            let raw = $event.target.value.replace(/\D/g, '');
                                            item.unit_price = raw ? parseInt(raw, 10) : 0;
                                            $event.target.value = item.unit_price ? formatNum(item.unit_price) : '';
                                            recalc();
                                        "
                                        class="input-soft text-sm bg-white" placeholder="0">
                                </div>
                                <div class="w-24 shrink-0 text-right">
                                    <label class="text-xs text-gray-400 block mb-0.5">Total</label>
                                    <div class="text-sm font-bold text-gray-700 pt-2">
                                        Rp <span x-text="formatNum(item.quantity * item.unit_price)"></span>
                                    </div>
                                </div>
                                <button type="button" @click="removeItem(index)"
                                        class="text-red-400 hover:text-red-600 text-lg shrink-0 pt-4">✕</button>
                            </div>
                            {{-- Taxable and Discount checkboxes --}}
                            <div class="mt-2 flex items-center gap-4">
                                <div class="flex items-center gap-2">
                                    <input type="hidden" :name="`items[${index}][is_taxable]`" value="0">
                                    <input type="checkbox" :name="`items[${index}][is_taxable]`"
                                           :id="`taxable_${index}`"
                                           x-model="item.is_taxable" @change="recalc()"
                                           value="1"
                                           class="w-3.5 h-3.5 accent-pink-400">
                                    <label :for="`taxable_${index}`" class="text-xs text-gray-500 cursor-pointer select-none">
                                        Taxable
                                    </label>
                                </div>
                                <div class="flex items-center gap-2" x-show="addDiscount">
                                    <input type="hidden" :name="`items[${index}][is_discountable]`" value="0">
                                    <input type="checkbox" :name="`items[${index}][is_discountable]`"
                                           :id="`discountable_${index}`"
                                           x-model="item.is_discountable" @change="recalc()"
                                           value="1"
                                           class="w-3.5 h-3.5 accent-pink-400">
                                    <label :for="`discountable_${index}`" class="text-xs text-gray-500 cursor-pointer select-none">
                                        Discount
                                    </label>
                                </div>
                            </div>
                        </div>
                    </template>
                </div>
            </div>

            {{-- Totals --}}
            <div class="bg-pink-50 rounded-2xl p-4 mb-5">
                <div class="mb-3 border-b border-pink-100 pb-3 flex flex-col sm:flex-row sm:items-center gap-y-2 gap-x-4 min-h-[32px]">
                    <label class="flex items-center gap-2 cursor-pointer shrink-0 w-max">
                        <input type="checkbox" x-model="addDiscount" @change="toggleDiscount()" class="w-4 h-4 accent-pink-400">
                        <span class="text-sm font-bold text-gray-700">Add Discount</span> 
                    </label>
                    <div x-show="addDiscount" class="flex items-center gap-3 flex-1 overflow-hidden" style="display: none;">
                        <input type="range" name="discount_rate" min="5" max="90" step="5" x-model.number="discountRate" @input="recalc()" class="w-32 sm:w-48 accent-pink-500 h-2 bg-pink-100 rounded-lg appearance-none cursor-pointer shrink-0 hover:accent-pink-600 transition-all">
                        <span class="font-bold text-pink-600 text-sm shrink-0 w-8 text-right"><span x-text="discountRate"></span>%</span>
                        <span class="text-xs text-pink-500 font-medium tracking-wide truncate border-l border-pink-200 pl-3" x-text="getDiscountLabel()"></span>
                    </div>
                </div>
                
                <div class="flex justify-between text-sm py-1">
                    <span class="text-gray-500">Subtotal (all items)</span>
                    <span class="font-semibold">Rp <span x-text="formatNum(subtotal)"></span></span>
                </div>
                <div class="flex justify-between text-sm py-1 text-pink-500" x-show="addDiscount && discountAmount > 0">
                    <span>Discount (<span x-text="discountRate"></span>%)</span>
                    <span class="font-semibold">- Rp <span x-text="formatNum(discountAmount)"></span></span>
                </div>
                <div class="flex justify-between text-sm py-1 text-amber-600">
                    <span>Tax (<span x-text="taxRate"></span>% — paid by client)</span>
                    <span class="font-semibold">Rp <span x-text="formatNum(taxAmount)"></span></span>
                </div>
                <div class="flex justify-between text-base font-bold py-2 mt-1 border-t border-pink-200">
                    <span class="text-gray-700">Grand Total</span>
                    <span class="text-pink-600">Rp <span x-text="formatNum(total)"></span></span>
                </div>
            </div>

            <div class="mb-5 flex items-center gap-2 bg-pink-50/50 p-4 rounded-2xl border border-pink-100">
                <input type="hidden" name="use_custom_fields" value="0">
                <input type="checkbox" id="useCustomFields" name="use_custom_fields" value="1" x-model="showCustomFields" class="w-4 h-4 text-pink-600 bg-white border-pink-300 rounded focus:ring-pink-500 cursor-pointer">
                <label for="useCustomFields" class="text-sm font-bold text-gray-700 cursor-pointer select-none">Show Custom Bank & Signature Settings</label>
            </div>

            <div x-show="showCustomFields" x-collapse>
                {{-- Bank Info --}}
                <div class="grid grid-cols-1 sm:grid-cols-2 gap-3 mb-5">
                    <div>
                        <label class="block text-xs font-semibold text-gray-600 mb-1">Bank Name</label>
                        <input type="text" name="bank_name" value="{{ old('bank_name', $invoice->bank_name) }}"
                               class="input-soft text-sm">
                    </div>
                    <div>
                        <label class="block text-xs font-semibold text-gray-600 mb-1">Branch Name</label>
                        <input type="text" name="branch_name" value="{{ old('branch_name', $invoice->branch_name) }}"
                               class="input-soft text-sm" placeholder="e.g. KCP Sudirman">
                    </div>
                    <div>
                        <label class="block text-xs font-semibold text-gray-600 mb-1">Account Number</label>
                        <input type="text" name="bank_account" value="{{ old('bank_account', $invoice->bank_account) }}"
                               class="input-soft text-sm">
                    </div>
                    <div>
                        <label class="block text-xs font-semibold text-gray-600 mb-1">Account Holder</label>
                        <input type="text" name="bank_holder" value="{{ old('bank_holder', $invoice->bank_holder) }}"
                               class="input-soft text-sm">
                    </div>
                </div>

                {{-- Custom Signature Text --}}
                <div class="grid grid-cols-1 sm:grid-cols-2 gap-3 mb-5">
                    <div>
                        <label class="block text-xs font-semibold text-gray-600 mb-1">Signer Name</label>
                        <input type="text" name="signer_name" value="{{ old('signer_name', $invoice->signer_name) }}" class="input-soft text-sm" placeholder="e.g. Cathy">
                    </div>
                    <div>
                        <label class="block text-xs font-semibold text-gray-600 mb-1">Signer Title</label>
                        <input type="text" name="signer_title" value="{{ old('signer_title', $invoice->signer_title) }}" class="input-soft text-sm" placeholder="e.g. Director">
                    </div>
                </div>

                <div class="mb-5" x-data="{
                    removeSign() {
                        if (!confirm('Remove the signature from this invoice?')) return;
                        $refs.removeSignInput.value = '1';
                        this.$el.closest('form').submit();
                    }
                }">
                    <label class="block text-sm font-semibold text-gray-700 mb-1">Custom Signature Image (Optional)</label>
                    <p class="text-xs text-gray-400 mb-3">Upload a specific signature for this invoice. Leave blank to keep the current one.</p>
                    
                    @if($invoice->signature_image)
                        <div class="flex items-center gap-4 mb-3 p-3 bg-white rounded-xl border border-pink-100">
                            <img src="{{ '/storage/' . $invoice->signature_image }}" alt="Signature" class="h-16 object-contain">
                            <div>
                                <input type="hidden" name="remove_signature" value="0" x-ref="removeSignInput">
                                <button type="button" @click="removeSign()" class="text-xs px-3 py-1.5 rounded-full border border-red-200 text-red-400 hover:bg-red-50">
                                    🗑️ Remove
                                </button>
                            </div>
                        </div>
                    @endif
                    
                    <input type="file" name="signature_image" accept="image/*" class="w-full text-sm text-gray-600
                                      file:mr-3 file:py-1.5 file:px-4
                                      file:rounded-full file:border-0
                                      file:text-xs file:font-semibold
                                      file:bg-pink-50 file:text-pink-600
                                      hover:file:bg-pink-100 cursor-pointer">
                </div>
            </div>

            <div class="mb-5">
                <label class="block text-sm font-semibold text-gray-700 mb-1">Notes / Payment Terms</label>
                <textarea name="notes" rows="2" class="input-soft resize-none">{{ old('notes', $invoice->notes) }}</textarea>
            </div>

            <div class="flex flex-col sm:flex-row gap-3">
                <button type="submit" class="btn-sakura flex-1 py-3">💾 Save Changes</button>
                <a href="{{ route('invoices.show', $invoice) }}"
                   class="flex-1 py-3 text-center rounded-full border border-pink-200 text-gray-600 hover:bg-pink-50 font-semibold text-sm">
                    Cancel
                </a>
            </div>
        </form>
    </div>
</div>

@push('scripts')
<script>
function invoiceEditForm() {
    @php
        $itemsJson = $invoice->items->map(function($i) {
            return ['description' => $i->description, 'quantity' => $i->quantity, 'unit_price' => (float)$i->unit_price, 'is_taxable' => (bool)$i->is_taxable, 'is_discountable' => (bool)$i->is_discountable];
        });
    @endphp
    return {
        showCustomFields: {{ old('use_custom_fields', ($invoice->bank_name || $invoice->signature_image || $invoice->signer_name || $invoice->signer_title) ? true : false) ? 'true' : 'false' }},
        addDiscount: {{ $invoice->discount_rate > 0 ? 'true' : 'false' }},
        discountRate: {{ $invoice->discount_rate ?: 5 }},
        items: @json($itemsJson),
        taxRate: {{ $invoice->tax_rate }},
        get subtotal() {
            return this.items.reduce((s, i) => s + (i.quantity * i.unit_price), 0);
        },
        get discountAmount() {
            if (!this.addDiscount) return 0;
            const discountable = this.items
                .filter(i => i.is_discountable)
                .reduce((s, i) => s + (i.quantity * i.unit_price), 0);
            return Math.round(discountable * (this.discountRate / 100));
        },
        get totalSubtotal() {
            return this.subtotal - this.discountAmount;
        },
        get taxAmount() {
            const taxable = this.items
                .filter(i => i.is_taxable)
                .reduce((s, i) => {
                    let itemTotal = i.quantity * i.unit_price;
                    if (this.addDiscount && i.is_discountable) {
                        itemTotal -= itemTotal * (this.discountRate / 100);
                    }
                    return s + itemTotal;
                }, 0);
            return Math.round(taxable * this.taxRate / 100);
        },
        get total() { return this.totalSubtotal; }, // grand total = pre-tax
        getDiscountLabel() {
            const labels = {
                5: 'Small thank-you discount 🙏',
                10: 'Appreciation bonus ✨',
                15: 'Loyalty perk unlocked 🤝',
                20: 'Client appreciation deal 💼',
                25: 'Special partner discount ⭐',
                30: 'Valued client offer 🎯',
                35: 'Priority client savings 📌',
                40: 'Strong appreciation rate 💎',
                45: 'Preferred client pricing 🏅',
                50: 'Half-off partner special 🎉',
                55: 'Premium loyalty reward 🧩',
                60: 'Major appreciation offer 🚀',
                65: 'VIP-level savings 🏆',
                70: 'Elite client advantage 👑',
                75: 'Strategic partner bonus 🤝✨',
                80: 'Executive-tier discount 💼🔥',
                85: 'Signature client reward 🖋️',
                90: 'Ultimate partnership rate 🌟'
            };
            return labels[this.discountRate] || '';
        },
        toggleDiscount() {
            if (this.addDiscount) {
                this.items.forEach(i => i.is_discountable = true);
            } else {
                this.items.forEach(i => i.is_discountable = false);
            }
        },
        addItem()      { this.items.push({ description: '', quantity: 1, unit_price: 0, is_taxable: true, is_discountable: this.addDiscount }); },
        removeItem(i)  { if (this.items.length > 1) this.items.splice(i, 1); },
        recalc()       {},
        formatNum(n)   { return Number(n).toLocaleString('id-ID'); },
    };
}
</script>
@endpush
@endsection