<?php

namespace App\Services;

use App\Models\EmailNotificationTemplate;
use App\Models\Invoice;
use Illuminate\Support\Facades\View;

class EmailNotificationTemplateRenderer
{
    private const BANNERS = [
        'vm_credentials' => 'https://res.cloudinary.com/izpast9i/image/upload/v1786503590/email_banner_cloud_vps.png',
    ];

    public function render(EmailNotificationTemplate $tpl, Invoice $invoice, string $companyName = ''): string
    {
        $blocks = collect($tpl->blocks)
            ->filter(fn($b) => $b['enabled'] ?? false)
            ->sortBy('order')
            ->values();

        $bodyHtml = '';
        foreach ($blocks as $block) {
            $bodyHtml .= $this->renderBlock($block, $invoice, $companyName);
        }

        $title = $tpl->header_title ?? 'Thông báo hóa đơn';

        return $this->wrapLayout($title, $bodyHtml, $companyName, self::BANNERS[$tpl->type] ?? null);
    }

    /**
     * Render a vm_credentials template using the emailData array from SendVmCredentialsEmailJob.
     * $emailData keys: company_name, client_name, product_name, product_billing, product_price,
     *                  service_host, service_username, service_port, service_password, os_name, service_due_exp
     */
    public function renderVmCredentials(EmailNotificationTemplate $tpl, array $emailData, ?Invoice $invoice = null): string
    {
        $blocks = collect($tpl->blocks)
            ->filter(fn($b) => $b['enabled'] ?? false)
            ->sortBy('order')
            ->values();

        $companyName = $emailData['company_name'] ?? '';
        $bodyHtml    = '';

        foreach ($blocks as $block) {
            $bodyHtml .= match ($block['type'] ?? '') {
                'greeting'       => $this->renderView('emails.partials.greeting', ['name' => $emailData['client_name'] ?? 'Quý khách']),
                'vm_credentials' => $this->renderView('emails.partials.vm-credentials', ['fields' => $block['config']['fields'] ?? null, 'data' => $emailData]),
                'product_info'   => $this->renderView('emails.partials.product-info', ['fields' => $block['config']['fields'] ?? null, 'data' => $emailData]),
                'invoice_info'   => $invoice ? $this->renderView('emails.partials.invoice-info', ['fields' => $block['config']['fields'] ?? null, 'invoice' => $invoice]) : '',
                'order_items'    => $invoice ? $this->renderOrderItems($invoice) : '',
                'attachments'    => $invoice ? $this->renderAttachments($invoice) : '',
                'custom_text'    => $this->renderView('emails.partials.custom-text', ['content' => $block['config']['content'] ?? '']),
                'footer'         => $this->renderView('emails.partials.signature', ['companyName' => $companyName]),
                default          => '',
            };
        }

        $title = $tpl->header_title ?? 'Thông tin truy cập VPS';

        return $this->wrapLayout($title, $bodyHtml, $companyName, self::BANNERS[$tpl->type] ?? null);
    }

    public function renderPreview(EmailNotificationTemplate $tpl): string
    {
        if ($tpl->type === 'vm_credentials') {
            return $this->renderVmCredentials($tpl, $this->sampleVmData(), null);
        }

        $invoice = $this->sampleInvoice();
        return $this->render($tpl, $invoice, 'Công ty Demo');
    }

    // ─── Block renderers ──────────────────────────────────────────────────────

    private function renderBlock(array $block, Invoice $invoice, string $companyName): string
    {
        return match ($block['type'] ?? '') {
            'greeting'      => $this->renderView('emails.partials.greeting', ['name' => $invoice->customer?->fullname ?? 'Quý khách']),
            'invoice_info'  => $this->renderView('emails.partials.invoice-info', ['fields' => $block['config']['fields'] ?? null, 'invoice' => $invoice]),
            'customer_info' => $this->renderView('emails.partials.customer-info', ['fields' => $block['config']['fields'] ?? null, 'customer' => $invoice->customer]),
            'order_items'   => $this->renderOrderItems($invoice),
            'attachments'   => $this->renderAttachments($invoice),
            'custom_text'   => $this->renderView('emails.partials.custom-text', ['content' => $block['config']['content'] ?? '']),
            'footer'        => $this->renderView('emails.partials.signature', ['companyName' => $companyName]),
            default         => '',
        };
    }

    private function renderOrderItems(Invoice $invoice): string
    {
        $order = $invoice->order;
        if (!$order) return '';

        $order->loadMissing('orderItems.product');

        return $this->renderView('emails.partials.order-items', ['items' => $order->orderItems]);
    }

    private function renderAttachments(Invoice $invoice): string
    {
        $invoice->loadMissing('attachments');

        return $this->renderView('emails.partials.attachments', ['attachments' => $invoice->attachments]);
    }

    private function renderView(string $view, array $data): string
    {
        return View::make($view, $data)->render();
    }

    // ─── Layout wrapper ───────────────────────────────────────────────────────

    private function wrapLayout(string $title, string $body, string $companyName, ?string $bannerUrl = null): string
    {
        return View::make('emails.layouts.notification', [
            'title'       => $title,
            'body'        => $body,
            'companyName' => $companyName ?: config('app.name', 'Thế Giới Số'),
            'bannerUrl'   => $bannerUrl,
        ])->render();
    }

    // ─── Sample data for preview ──────────────────────────────────────────────

    private function sampleVmData(): array
    {
        return [
            'company_name'     => 'Công ty Demo',
            'company_logo'     => '',
            'client_name'      => 'Nguyễn Văn A',
            'product_name'     => 'VPS Starter',
            'product_billing'  => 'Hàng tháng',
            'product_price'    => '420.000',
            'service_host'     => '203.113.x.x',
            'service_username' => 'root',
            'service_port'     => '22',
            'service_password' => 'P@ssw0rd!2026',
            'os_name'          => 'Ubuntu 22.04 LTS',
            'service_due_exp'  => date('d/m/Y', strtotime('+1 month')),
        ];
    }

    private function sampleInvoice(): Invoice
    {
        $invoice = new Invoice([
            'invoice_number' => 'INV-20260521-00001',
            'sub_total'      => 420000,
            'tax'            => 0,
            'total'          => 420000,
            'status'         => 2,
            'payment_method' => 'credit',
        ]);
        $invoice->created_at = now();
        $invoice->due_date   = now()->addDays(7)->toDateString();
        return $invoice;
    }
}