<?php

declare(strict_types=1);

namespace App\Http\Controllers;

use App\Enums\InvoiceStatus;
use App\Models\Client;
use App\Models\Invoice;
use App\Models\InvoiceSettings;
use App\Services\InvoiceService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\View\View;

class InvoiceController extends Controller
{
    public function __construct(
        private readonly InvoiceService $invoiceService
    ) {}

    public function index(): View
    {
        $invoices = Invoice::with('client')->latest()->paginate(15);
        return view('invoices.index', compact('invoices'));
    }

    public function create(): View
    {
        $clients         = Client::where('status', 'active')->orderBy('name')->get();
        $statuses        = InvoiceStatus::cases();
        $invoiceSettings = InvoiceSettings::instance();
        return view('invoices.create', compact('clients', 'statuses', 'invoiceSettings'));
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'client_id'   => 'nullable|exists:clients,id',
            'title'       => 'required|string|max:255',
            'description' => 'nullable|string',
            'tax_rate'    => 'required|numeric|min:0|max:100',
            'currency'    => 'required|string|max:10',
            'issue_date'  => 'required|date',
            'due_date'    => 'required|date|after_or_equal:issue_date',
            'notes'       => 'nullable|string',
            'signature_image' => 'nullable|image|max:2048',
            'signer_name'  => 'nullable|string|max:255',
            'signer_title' => 'nullable|string|max:255',
            'bank_name'    => 'nullable|string|max:100',
            'bank_account' => 'nullable|string|max:50',
            'bank_holder'  => 'nullable|string|max:100',
            'branch_name'  => 'nullable|string|max:100',
            'items'        => 'required|array|min:1',
            'items.*.description' => 'required|string',
            'items.*.quantity'    => 'required|integer|min:1',
            'items.*.unit_price'  => 'required|numeric|min:0',
            'items.*.is_taxable'  => 'nullable|boolean',
        ]);

        $items = $validated['items'];
        unset($validated['items']);
        $validated['status'] = InvoiceStatus::Draft->value;
        
        if ($request->hasFile('signature_image')) {
            $validated['signature_image'] = $request->file('signature_image')->store('invoice-signatures', 'public');
        } else {
            // Fallback to settings signature if none provided at creation
            $settings = InvoiceSettings::instance();
            if ($settings->signature_image) {
                // We reference the same image path, or copy it.
                // Assuming referencing the same public image is fine.
                $validated['signature_image'] = $settings->signature_image;
            }
        }

        $invoice = $this->invoiceService->create($validated, $items);

        return redirect()->route('invoices.show', $invoice)
            ->with('success', '🧾 Invoice created!');
    }

    public function show(Invoice $invoice): View
    {
        $invoice->load('client', 'items');
        $invoiceSettings = InvoiceSettings::instance();
        return view('invoices.show', compact('invoice', 'invoiceSettings'));
    }

    public function edit(Invoice $invoice): View
    {
        $clients         = Client::where('status', 'active')->orderBy('name')->get();
        $statuses        = InvoiceStatus::cases();
        $invoiceSettings = InvoiceSettings::instance();
        $invoice->load('client', 'items');
        return view('invoices.edit', compact('invoice', 'clients', 'statuses', 'invoiceSettings'));
    }

    public function update(Request $request, Invoice $invoice): RedirectResponse
    {
        $validated = $request->validate([
            'client_id'   => 'nullable|exists:clients,id',
            'title'       => 'required|string|max:255',
            'description' => 'nullable|string',
            'tax_rate'    => 'required|numeric|min:0|max:100',
            'status'      => 'required|in:draft,sent,paid,overdue,cancelled',
            'issue_date'  => 'required|date',
            'due_date'    => 'required|date',
            'paid_date'   => 'nullable|date',
            'notes'        => 'nullable|string',
            'signature_image' => 'nullable|image|max:2048',
            'signer_name'  => 'nullable|string|max:255',
            'signer_title' => 'nullable|string|max:255',
            'bank_name'    => 'nullable|string|max:100',
            'bank_account' => 'nullable|string|max:50',
            'bank_holder'  => 'nullable|string|max:100',
            'branch_name'  => 'nullable|string|max:100',
            'items'        => 'required|array|min:1',
            'items.*.description' => 'required|string',
            'items.*.quantity'    => 'required|integer|min:1',
            'items.*.unit_price'  => 'required|numeric|min:0',
            'items.*.is_taxable'  => 'nullable|boolean',
        ]);

        $items = $validated['items'];
        unset($validated['items']);
        
        if ($request->hasFile('signature_image')) {
            if ($invoice->signature_image && \Illuminate\Support\Facades\Storage::disk('public')->exists($invoice->signature_image)) {
                \Illuminate\Support\Facades\Storage::disk('public')->delete($invoice->signature_image);
            }
            $validated['signature_image'] = $request->file('signature_image')->store('invoice-signatures', 'public');
        } elseif ($request->boolean('remove_signature')) {
            if ($invoice->signature_image && \Illuminate\Support\Facades\Storage::disk('public')->exists($invoice->signature_image)) {
                \Illuminate\Support\Facades\Storage::disk('public')->delete($invoice->signature_image);
            }
            $validated['signature_image'] = null;
        }

        $this->invoiceService->update($invoice, $validated, $items);

        return redirect()->route('invoices.show', $invoice)
            ->with('success', '🧾 Invoice updated!');
    }

    public function destroy(Invoice $invoice): RedirectResponse
    {
        $invoice->delete();
        return redirect()->route('invoices.index')->with('success', 'Invoice deleted.');
    }

    public function pdf(Invoice $invoice): Response
    {
        return $this->invoiceService->generatePdf($invoice);
    }
}