@extends('layouts.app')

@section('title', 'Invoice ' . $invoice->invoice_number)

@section('content')

@php
    $sv             = $invoice->status instanceof \App\Enums\InvoiceStatus ? $invoice->status->value : $invoice->status;
    $symbol         = $invoice->currency instanceof \App\Enums\Currency ? $invoice->currency->symbol() : (string) $invoice->currency;
    $isOverdue      = $invoice->due_date->isPast() && $sv === 'unpaid';
    $remaining      = $invoice->remainingAmount();
    $invoice->loadMissing('payments');
    $payments       = $invoice->payments->sortByDesc('paid_at');
    $totalPaid      = $payments->reduce(fn ($carry, $p) => bcadd($carry, (string) $p->amount, 2), '0');
    $paidPct        = bccomp((string) $invoice->amount, '0', 2) > 0
        ? min(100, max(0, (int) bcmul(bcdiv($totalPaid, (string) $invoice->amount, 4), '100', 0)))
        : 0;
    $badgeClass     = match($sv) {
        'unpaid'  => 'bg-amber-50 text-amber-700',
        'partial' => 'bg-sky-50 text-sky-700',
        'paid'    => 'bg-emerald-50 text-emerald-700',
        default   => 'bg-slate-100 text-slate-600',
    };
    $badgeLabel     = match($sv) {
        'unpaid'  => 'Unpaid',
        'partial' => 'Partial Payment',
        'paid'    => 'Paid in Full',
        default   => ucfirst($sv),
    };
    $progressColor  = match($sv) {
        'paid'    => 'bg-emerald-500',
        'partial' => 'bg-sky-600',
        default   => 'bg-slate-300',
    };
    $paymentMethods = \App\Enums\PaymentMethod::cases();
    $currencies     = \App\Enums\Currency::cases();
@endphp

<div class="px-8 py-8">

    {{-- Flash messages --}}
    @if (session('success'))
        <div class="mb-6 flex items-center gap-3 bg-emerald-50 border border-emerald-200 text-emerald-700 text-sm rounded-lg px-4 py-3">
            <svg class="w-4 h-4 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"/>
            </svg>
            {{ session('success') }}
        </div>
    @endif

    @if (session('error'))
        <div class="mb-6 flex items-center gap-3 bg-red-50 border border-red-200 text-red-600 text-sm rounded-lg px-4 py-3">
            <svg class="w-4 h-4 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"/>
            </svg>
            {{ session('error') }}
        </div>
    @endif

    {{-- Page header --}}
    <div class="mb-6">
        @if($invoice->proposal_id)
            <a href="{{ route('proposals.show', $invoice->proposal_id) }}" class="text-sm text-slate-400 hover:text-slate-600 transition-colors duration-150">
                &larr; Back to Proposal
            </a>
        @else
            <a href="{{ route('invoices.index') }}" class="text-sm text-slate-400 hover:text-slate-600 transition-colors duration-150">
                &larr; Back to Invoices
            </a>
        @endif
        <div class="flex items-center gap-3 mt-3 justify-between">
            <div class="flex items-center gap-3">
                <h1 class="text-xl font-semibold text-slate-900 font-mono">{{ $invoice->invoice_number }}</h1>
                <span class="inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-medium {{ $badgeClass }}">
                    {{ $badgeLabel }}
                </span>
                @if ($isOverdue)
                    <span class="inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-medium bg-red-50 text-red-600">
                        Overdue
                    </span>
                @endif
            </div>
            <a href="{{ route('invoices.pdf', $invoice) }}"
               target="_blank"
               rel="noopener noreferrer"
               class="inline-flex items-center gap-2 px-4 py-2.5 bg-white border border-slate-200 hover:border-slate-300 text-slate-700 text-sm font-medium rounded-lg transition-colors duration-150">
                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
                </svg>
                Download PDF
            </a>
        </div>
    </div>

    {{-- Two-column layout --}}
    <div class="grid grid-cols-3 gap-6">

        {{-- LEFT COLUMN (col-span-2): Invoice details --}}
        <div class="col-span-2">

            {{-- Card 1: Amount Hero + due date + client + project --}}
            <div class="bg-white border border-slate-100 rounded-xl p-6 mb-5" data-panel>
                <p class="text-xs font-medium text-slate-400 uppercase tracking-wider mb-1">Invoice Amount</p>
                <p class="text-4xl font-bold font-mono text-slate-900 mb-4">
                    {{ $symbol }}&nbsp;{{ number_format($invoice->amount, 2) }}
                </p>
                <div class="space-y-2 text-sm">
                    <div class="flex justify-between">
                        <span class="text-slate-400">Client</span>
                        <span class="font-medium text-slate-900">{{ $invoice->client->name }}</span>
                    </div>
                    <div class="flex justify-between">
                        <span class="text-slate-400">Project</span>
                        <span class="text-slate-600">{{ $invoice->project->title }}</span>
                    </div>
                    <div class="flex justify-between">
                        <span class="text-slate-400">Due Date</span>
                        <span class="{{ $isOverdue ? 'text-red-500 font-semibold' : 'text-slate-600' }}">
                            {{ $invoice->due_date->format('d M Y') }}
                            @if ($isOverdue)
                                <span class="text-red-400 text-xs">({{ $invoice->due_date->diffForHumans() }})</span>
                            @endif
                        </span>
                    </div>
                    @if ($sv === 'paid' && $invoice->paid_at)
                    <div class="flex justify-between">
                        <span class="text-slate-400">Paid On</span>
                        <span class="text-emerald-600 font-medium">{{ $invoice->paid_at->format('d M Y') }}</span>
                    </div>
                    @endif
                    @if ($sv !== 'paid')
                    <div class="flex justify-between pt-2 border-t border-slate-50 mt-2">
                        <span class="{{ $sv === 'unpaid' && $isOverdue ? 'text-red-500' : 'text-amber-600' }} font-medium">Remaining</span>
                        <span class="font-bold font-mono {{ $sv === 'unpaid' && $isOverdue ? 'text-red-500' : 'text-amber-600' }}">
                            {{ $symbol }}&nbsp;{{ number_format($remaining, 2) }}
                        </span>
                    </div>
                    @endif
                </div>
            </div>

            {{-- FX: Currency Conversion Box --}}
            @php
                $fxService = app(\App\Services\FxService::class);
                $fxRatesPhp = $fxService->getRates($invoice->currency->value);
            @endphp
            <div class="mt-4 p-4 bg-slate-50 rounded-xl border border-slate-100 mb-5">
                <p class="text-xs text-slate-400 uppercase tracking-wider mb-3">Also shown as · Rates updated daily</p>
                <div class="grid grid-cols-2 gap-2">
                    @foreach($fxRatesPhp as $fxCur => $fxRate)
                        @if($fxCur !== $invoice->currency->value)
                        @php
                            $fxConverted = bcmul((string) $invoice->amount, number_format((float) $fxRate, 8, '.', ''), 2);
                            $fxSymbol    = \App\Enums\Currency::from($fxCur)->symbol();
                        @endphp
                        <div class="flex items-center justify-between text-sm">
                            <span class="text-slate-500">{{ $fxCur }}</span>
                            <span class="font-mono font-medium text-slate-700">{{ $fxSymbol }}&nbsp;{{ number_format($fxConverted, 2) }}</span>
                        </div>
                        @endif
                    @endforeach
                </div>
                <p class="text-xs text-slate-300 mt-3">Source: exchangerate-api.com · Updated daily</p>
            </div>

            {{-- Card 2: Linked Proposal --}}
            @if ($invoice->proposal)
            <div class="bg-white border border-slate-100 rounded-xl p-5" data-panel>
                <p class="text-xs font-medium text-slate-400 uppercase tracking-wider mb-3">Linked Proposal</p>
                <div class="flex items-center justify-between">
                    <span class="text-sm font-mono text-slate-600">
                        PROP-{{ str_pad($invoice->proposal->id, 5, '0', STR_PAD_LEFT) }}
                    </span>
                    <a href="{{ route('proposals.show', $invoice->proposal) }}"
                       class="text-xs text-sky-700 hover:underline">View Proposal &rarr;</a>
                </div>
            </div>
            @endif

        </div>

        {{-- RIGHT COLUMN (col-span-1): Payment Management --}}
        <div class="col-span-1">

            {{-- Card A: Payment History (always visible) --}}
            <div class="bg-white border border-slate-100 rounded-xl p-5 mb-4" data-panel>
                <div class="flex items-baseline justify-between mb-3">
                    <p class="text-sm font-semibold text-slate-900">Payments</p>
                    <p class="text-xs text-slate-400 font-mono">
                        {{ $symbol }}&nbsp;{{ number_format($totalPaid, 2) }}
                        <span class="text-slate-300 mx-1">of</span>
                        {{ $symbol }}&nbsp;{{ number_format($invoice->amount, 2) }}
                    </p>
                </div>

                {{-- Progress bar --}}
                <div class="w-full bg-slate-100 rounded-full h-2 mb-1">
                    <div class="{{ $progressColor }} h-2 rounded-full transition-all duration-500"
                         style="width: {{ (int) $paidPct }}%"></div>
                </div>
                <p class="text-xs text-slate-400 text-right mb-4">{{ (int) $paidPct }}% paid</p>

                {{-- Payment list --}}
                @if ($payments->isEmpty())
                    <p class="text-sm text-slate-400 text-center py-4">No payments recorded yet</p>
                @else
                    <div class="space-y-2">
                        @foreach ($payments as $payment)
                        @php
                            $pmSymbol = $payment->currency instanceof \App\Enums\Currency
                                ? $payment->currency->symbol()
                                : (string) $payment->currency;
                            $pmLabel = $payment->payment_method instanceof \App\Enums\PaymentMethod
                                ? $payment->payment_method->label()
                                : (string) $payment->payment_method;
                        @endphp
                        <div class="flex items-start gap-3 py-2.5 border-t border-slate-50 first:border-t-0">
                            <div class="flex-1 min-w-0">
                                <p class="text-sm font-mono font-semibold text-slate-900">
                                    {{ $pmSymbol }}&nbsp;{{ number_format($payment->amount, 2) }}
                                </p>
                                <p class="text-xs text-slate-400 mt-0.5">
                                    {{ $pmLabel }} &middot; {{ \Carbon\Carbon::parse($payment->paid_at)->format('d M Y') }}
                                </p>
                                @if ($payment->notes)
                                    <p class="text-xs text-slate-400 italic mt-0.5 truncate">{{ $payment->notes }}</p>
                                @endif
                                @if ($payment->payment_currency && $payment->payment_currency !== $payment->currency)
                                    <p class="text-xs text-slate-400 mt-0.5">
                                        Paid: {{ $payment->payment_currency->symbol() }}&nbsp;{{ number_format($payment->payment_amount, 2) }}
                                        @ {{ number_format($payment->exchange_rate, 4) }}
                                    </p>
                                @endif
                            </div>
                            @if ($sv !== 'paid')
                            <form method="POST"
                                  action="{{ route('payments.destroy', $payment) }}">
                                @csrf
                                @method('DELETE')
                                <button type="submit"
                                        class="text-xs text-slate-300 hover:text-red-400 transition-colors duration-150 cursor-pointer mt-0.5"
                                        title="Remove payment"
                                        data-confirm="Remove this payment?">
                                    &times;
                                </button>
                            </form>
                            @endif
                        </div>
                        @endforeach
                    </div>
                @endif
            </div>

            {{-- Card B: Record Payment form (hide if fully paid) --}}
            @if (! $invoice->isFullyPaid())
            <div class="bg-white border border-slate-100 rounded-xl p-5" data-panel>
                <p class="text-sm font-semibold text-slate-900 mb-4">Record Payment</p>

                <form method="POST" action="{{ route('payments.store', $invoice) }}" class="space-y-3">
                    @csrf

                    {{-- Validation errors --}}
                    @if ($errors->any())
                    <div class="rounded-lg bg-red-50 border border-red-100 px-3 py-2 mb-2">
                        @foreach ($errors->all() as $error)
                            <p class="text-xs text-red-600">{{ $error }}</p>
                        @endforeach
                    </div>
                    @endif

                    {{-- Payment Currency --}}
                    <div>
                        <label class="block text-xs font-medium text-slate-500 mb-1">Payment Currency</label>
                        <select name="payment_currency"
                                id="payment_currency"
                                onchange="fxUpdateRate()"
                                class="w-full px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-slate-900/10 focus:border-slate-400 bg-white">
                            @foreach (\App\Enums\Currency::cases() as $cur)
                                <option value="{{ $cur->value }}"
                                        {{ (old('payment_currency', $invoice->currency->value) === $cur->value) ? 'selected' : '' }}>
                                    {{ $cur->symbol() !== $cur->value ? $cur->symbol() . ' ' . $cur->value : $cur->value }} — {{ match($cur->value) { 'GBP' => 'British Pound', 'USD' => 'US Dollar', 'PKR' => 'Pakistani Rupee', 'AED' => 'UAE Dirham', default => $cur->value } }}
                                </option>
                            @endforeach
                        </select>
                    </div>

                    {{-- Payment Amount --}}
                    <div>
                        <label class="block text-xs font-medium text-slate-500 mb-1">Amount</label>
                        <input type="number"
                               name="payment_amount"
                               id="payment_amount"
                               step="0.01"
                               min="0.01"
                               placeholder="{{ number_format($remaining, 2) }}"
                               value="{{ old('payment_amount') }}"
                               required
                               oninput="fxUpdateEquivalent()"
                               class="w-full px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-slate-900/10 focus:border-slate-400 font-mono">
                        <div id="fx-rate-display" class="text-xs text-slate-400 mt-1">Loading rates…</div>
                    </div>

                    {{-- Base equivalent (hidden until amount entered) --}}
                    <div id="base-equivalent" class="hidden p-3 bg-emerald-50 border border-emerald-100 rounded-lg text-sm">
                        <span class="text-emerald-700 font-medium">
                            ≈ <span id="base-amount">0.00</span>
                            {{ $invoice->currency->symbol() }} {{ $invoice->currency->value }}
                        </span>
                        <span class="text-emerald-500 text-xs ml-2">will be applied to invoice balance</span>
                    </div>

                    {{-- Payment Method --}}
                    <div>
                        <label class="block text-xs font-medium text-slate-500 mb-1">Payment Method</label>
                        <select name="payment_method"
                                class="w-full px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-slate-900/10 focus:border-slate-400 bg-white">
                            <option value="">Select method&hellip;</option>
                            @foreach ($paymentMethods as $method)
                                <option value="{{ $method->value }}"
                                        {{ old('payment_method') === $method->value ? 'selected' : '' }}>
                                    {{ $method->label() }}
                                </option>
                            @endforeach
                        </select>
                    </div>

                    {{-- Date --}}
                    <div>
                        <label class="block text-xs font-medium text-slate-500 mb-1">Date Received</label>
                        <input type="date"
                               name="paid_at"
                               value="{{ old('paid_at', now()->toDateString()) }}"
                               max="{{ now()->toDateString() }}"
                               required
                               class="w-full px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-slate-900/10 focus:border-slate-400">
                    </div>

                    {{-- Notes --}}
                    <div>
                        <label class="block text-xs font-medium text-slate-500 mb-1">Notes <span class="text-slate-300">(optional)</span></label>
                        <textarea name="notes"
                                  rows="2"
                                  maxlength="1000"
                                  placeholder="Reference number, remarks&hellip;"
                                  class="w-full px-3 py-2 text-sm border border-slate-200 rounded-lg focus:outline-none focus:ring-2 focus:ring-slate-900/10 focus:border-slate-400 resize-none">{{ old('notes') }}</textarea>
                    </div>

                    <button type="submit"
                            class="w-full px-4 py-2.5 bg-sky-700 hover:bg-sky-800 text-white text-sm font-medium rounded-lg transition-colors duration-150 cursor-pointer">
                        Record Payment
                    </button>
                </form>
            </div>
            @endif

        </div>

    </div>

</div>

<script>
(function () {
    const invoiceCurrency = @json($invoice->currency->value);
    const invoiceSymbol   = @json($invoice->currency->symbol());
    const remaining       = {{ (float) $invoice->remainingAmount() }};
    let   fxRates         = {};

    async function fxLoad() {
        try {
            const r = await fetch('/api/fx-rates/' + encodeURIComponent(invoiceCurrency));
            if (!r.ok) throw new Error('HTTP ' + r.status);
            const data = await r.json();
            fxRates = data.rates || {};
        } catch (_) {
            const el = document.getElementById('fx-rate-display');
            if (el) el.textContent = 'Rate unavailable — enter amount manually';
        }
        fxUpdateRate();
    }

    window.fxUpdateRate = function () {
        const sel     = document.getElementById('payment_currency');
        const display = document.getElementById('fx-rate-display');
        const amtEl   = document.getElementById('payment_amount');
        if (!sel || !display) return;

        const chosen = sel.value;
        if (chosen === invoiceCurrency) {
            display.textContent = 'Same currency — no conversion needed';
            if (amtEl) amtEl.placeholder = remaining.toFixed(2);
        } else {
            const rate = fxRates[chosen];
            if (rate && typeof rate === 'number' && rate > 0) {
                display.textContent = '1 ' + invoiceCurrency + ' = ' + rate.toFixed(4) + ' ' + chosen + ' · ECB rate';
                if (amtEl) amtEl.placeholder = (remaining * rate).toFixed(2);
            } else {
                display.textContent = 'Rate unavailable';
            }
        }
        fxUpdateEquivalent();
    };

    window.fxUpdateEquivalent = function () {
        const sel     = document.getElementById('payment_currency');
        const amtEl   = document.getElementById('payment_amount');
        const baseDiv = document.getElementById('base-equivalent');
        const baseEl  = document.getElementById('base-amount');
        if (!sel || !amtEl || !baseDiv || !baseEl) return;

        const chosen = sel.value;
        const amt    = parseFloat(amtEl.value);

        if (!amt || isNaN(amt) || amt <= 0) {
            baseDiv.classList.add('hidden');
            return;
        }

        if (chosen === invoiceCurrency) {
            baseEl.textContent = amt.toFixed(2);
        } else {
            const rate = fxRates[chosen];
            if (rate && typeof rate === 'number' && rate > 0) {
                baseEl.textContent = (amt / rate).toFixed(2);
            } else {
                baseDiv.classList.add('hidden');
                return;
            }
        }
        baseDiv.classList.remove('hidden');
    };

    document.addEventListener('DOMContentLoaded', fxLoad);
})();
</script>

<script>
(function() {
    var prefersReduced = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
    if (prefersReduced) return;
    var Motion = window.Motion;
    if (!Motion) return;
    var panels = document.querySelectorAll('[data-panel]');
    if (panels.length) {
        Motion.animate(panels, { opacity: [0, 1], y: [12, 0] }, { delay: Motion.stagger(0.07), duration: 0.25, easing: 'ease-out' });
    }
})();
</script>

@endsection