<?php

namespace App\Http\Controllers\Api\Admin\Invoice;

use App\Enums\Invoice\InvoiceStatus;
use App\Http\Controllers\Controller;
use App\Http\Requests\InvoiceRequest;
use App\Http\Resources\Api\Admin\InvoiceResource;
use App\Mail\InvoiceNotificationMail;
use App\Models\Customer;
use App\Models\Payment;
use App\Repositories\Invoice\InvoiceRepositoryInterface;
use App\Repositories\InvoiceAttachment\InvoiceAttachmentRepositoryInterface;
use App\Repositories\InvoiceItem\InvoiceItemRepositoryInterface;
use App\Repositories\Order\OrderRepositoryInterface;
use App\Services\InvoicePaymentService;
use App\Services\InvoicePdfService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Storage;
use Throwable;
use Yajra\DataTables\Facades\DataTables;

class InvoiceController extends Controller
{
    public function __construct(
        private readonly InvoiceRepositoryInterface $invoiceRepository,
        private readonly OrderRepositoryInterface $orderRepository,
        private readonly InvoiceItemRepositoryInterface $invoiceItemRepository,
        private readonly InvoiceAttachmentRepositoryInterface $attachmentRepository,
        private readonly InvoicePdfService $invoicePdfService,
        private readonly InvoicePaymentService $invoicePaymentService,
    ) {}

    public function index(Request $request): JsonResponse
    {
        $query = $this->invoiceRepository->filter(
            $request->all(),
            ['payment', 'customer', 'order'],
            [],
            ['*'],
            true
        );

        return response()->json([
            'error' => false,
            'data' => [
                'items' => InvoiceResource::collection($query->get())->resolve(),
                'total' => $query->count(),
            ],
        ]);
    }

    public function datatable(Request $request): JsonResponse
    {
        $query = $this->invoiceRepository->filter(
            $request->all(),
            ['payment', 'customer', 'order'],
            [],
            ['*'],
            true
        );

        return DataTables::eloquent($query)
            ->addColumn('invoice_number', fn($d) => $d->invoice_number)
            ->addColumn('date', fn($d) => $d->date)
            ->addColumn('customer', fn($d) => $d->customer?->fullname)
            ->addColumn('payment', fn($d) => $d->payment?->name)
            ->addColumn('total', fn($d) => $d->total)
            ->addColumn('status', fn($d) => $d->status)
            ->addColumn('action', fn($d) => $d->id)
            ->rawColumns(['invoice_number', 'date', 'customer', 'payment', 'total', 'status', 'action'])
            ->make(true);
    }

    public function store(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'customer_id' => 'required|numeric',
            'payment_method' => 'required|numeric',
            'sub_total' => 'required|numeric',
            'total' => 'required|numeric',
        ]);

        $invoiceData = [
            'date' => time(),
            'due_date' => time() + (7 * 24 * 60 * 60),
            'sub_total' => $validated['sub_total'],
            'tax' => $validated['sub_total'] * 0.1,
            'total' => $validated['total'],
            'payment_method' => $validated['payment_method'],
            'customer_id' => $validated['customer_id'],
            'status' => 0,
        ];

        try {
            DB::beginTransaction();
            $invoice = $this->invoiceRepository->create($invoiceData);
            DB::commit();

            return response()->json([
                'error' => false,
                'message' => 'Invoice created successfully',
                'data' => new InvoiceResource($invoice)
            ], 201);
        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'error' => true,
                'message' => $e->getMessage()
            ], 500);
        }
    }

    public function show(int $id): JsonResponse
    {
        $invoice = $this->invoiceRepository->findWithRelationships($id, ['payment', 'invoiceItem', 'customer']);

        if (!$invoice) {
            return response()->json([
                'error' => true,
                'message' => "Can't find invoice by ID #" . $id
            ], 404);
        }

        return response()->json([
            'error' => false,
            'data' => new InvoiceResource($invoice)
        ]);
    }

    public function update(InvoiceRequest $request, int $id): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);

        if (!$invoice) {
            return response()->json([
                'error' => true,
                'message' => "Can't find invoice by ID #" . $id
            ], 404);
        }

        $request->validated();

        $action = strtolower((string) $request->get('action'));
        $status = match ($action) {
            'paid' => InvoiceStatus::PAID->value,
            'cancel' => InvoiceStatus::CANCELLED->value,
            default => null,
        };

        if ($status === null) {
            return response()->json([
                'error' => true,
                'message' => 'Invalid invoice action.',
            ], 422);
        }

        try {
            DB::beginTransaction();
            $invoice->load(['order', 'customer']);

            if ($status === InvoiceStatus::PAID->value) {
                $this->invoicePaymentService->markPaidByAdmin($invoice, auth()->id());
            } else {
                $invoice->update([
                    'status' => $status,
                    'paid_at' => null,
                ]);
            }

            DB::commit();

            return response()->json([
                'error' => false,
                'message' => 'Invoice updated successfully'
            ]);
        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'error' => true,
                'message' => $e->getMessage()
            ], 500);
        }
    }

    public function destroy(int $id): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);

        if (!$invoice) {
            return response()->json([
                'error' => true,
                'message' => "Can't find invoice by ID #" . $id
            ], 404);
        }

        try {
            DB::beginTransaction();
            $this->orderRepository->updateBy('invoice_id', $id, ['invoice_id' => 0]);
            $this->invoiceRepository->delete($id);
            DB::commit();

            return response()->json([
                'error' => false,
                'message' => 'Invoice deleted successfully'
            ]);
        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'error' => true,
                'message' => $e->getMessage()
            ], 500);
        }
    }

    public function markAsPaid(int $id): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);

        if (!$invoice) {
            return response()->json([
                'error' => true,
                'message' => "Can't find invoice by ID #" . $id
            ], 404);
        }

        try {
            DB::beginTransaction();

            $invoice->load(['order', 'customer']);
            $this->invoicePaymentService->markPaidByAdmin($invoice, auth()->id());

            DB::commit();

            return response()->json([
                'error' => false,
                'message' => 'Invoice marked as paid'
            ]);
        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'error' => true,
                'message' => $e->getMessage()
            ], 500);
        }
    }

    public function cancel(int $id): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);

        if (!$invoice) {
            return response()->json([
                'error' => true,
                'message' => "Can't find invoice by ID #" . $id
            ], 404);
        }

        try {
            DB::beginTransaction();
            $invoice->update([
                'status' => InvoiceStatus::CANCELLED->value,
                'paid_at' => null
            ]);
            DB::commit();

            return response()->json([
                'error' => false,
                'message' => 'Invoice cancelled'
            ]);
        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'error' => true,
                'message' => $e->getMessage()
            ], 500);
        }
    }

    // ─── Attachments ────────────────────────────────────────────────────────────

    public function listAttachments(int $id): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);
        if (!$invoice) {
            return response()->json(['error' => true, 'message' => "Can't find invoice #$id"], 404);
        }

        $attachments = $this->attachmentRepository->getByInvoice($id);

        return response()->json([
            'error' => false,
            'data'  => $attachments,
        ]);
    }

    public function uploadAttachment(Request $request, int $id): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);
        if (!$invoice) {
            return response()->json(['error' => true, 'message' => "Can't find invoice #$id"], 404);
        }

        $request->validate([
            'file' => 'required|file|mimes:jpg,jpeg,png,gif,pdf,doc,docx,xls,xlsx|max:10240',
        ]);

        $file     = $request->file('file');
        $path     = $file->store("invoice-attachments/{$id}", 'public');
        $uploader = $request->user()?->username ?? $request->user()?->name ?? 'admin';

        $attachment = $this->attachmentRepository->create([
            'invoice_id'  => $id,
            'filename'    => $file->getClientOriginalName(),
            'path'        => $path,
            'disk'        => 'public',
            'mime_type'   => $file->getMimeType(),
            'size'        => $file->getSize(),
            'uploaded_by' => $uploader,
        ]);

        return response()->json([
            'error'   => false,
            'message' => 'File uploaded successfully',
            'data'    => $attachment,
        ], 201);
    }

    public function deleteAttachment(int $id, int $attachmentId): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);
        if (!$invoice) {
            return response()->json(['error' => true, 'message' => "Can't find invoice #$id"], 404);
        }

        $attachment = $this->attachmentRepository->find($attachmentId);
        if (!$attachment || $attachment->invoice_id !== $id) {
            return response()->json(['error' => true, 'message' => 'Attachment not found'], 404);
        }

        $this->attachmentRepository->deleteWithFile($attachmentId);

        return response()->json([
            'error'   => false,
            'message' => 'Attachment deleted',
        ]);
    }

    // ─── Send Mail ───────────────────────────────────────────────────────────────

    public function sendMail(Request $request, int $id): JsonResponse
    {
        $request->validate([
            'message' => 'nullable|string|max:1000',
            'type'    => 'nullable|string|in:invoice,renewal',
        ]);

        $invoice = $this->invoiceRepository->find($id);
        if (!$invoice) {
            return response()->json(['error' => true, 'message' => "Can't find invoice #$id"], 404);
        }

        $invoice->load('customer');
        $customer = $invoice->customer;
        if (!$customer || !$customer->email) {
            return response()->json(['error' => true, 'message' => 'Customer email not found'], 422);
        }

        $attachments = $this->attachmentRepository->getByInvoice($id);
        $companyName = setting('general.company_name') ?: config('app.name');
        $type        = $request->get('type', 'invoice');
        $message     = $request->get(
            'message',
            $type === 'renewal'
                ? "Dịch vụ của quý khách sắp đến hạn gia hạn. Vui lòng kiểm tra hóa đơn #{$invoice->order_num} được đính kèm và hoàn tất thanh toán để dịch vụ không bị gián đoạn."
                : "Vui lòng xem thông tin hóa đơn #{$invoice->order_num} của bạn."
        );
        $paymentUrl = url('/client/invoices/' . $invoice->invoice_number . '/payment');
        try {
            $invoicePdf         = $this->invoicePdfService->generate($invoice);
            $invoicePdfFileName = $this->invoicePdfService->generateFileName($invoice);

            Mail::to($customer->email)->send(
                new InvoiceNotificationMail(
                    $invoice,
                    $attachments,
                    $customer->fullname,
                    $message,
                    $companyName,
                    $type,
                    $invoicePdf,
                    $invoicePdfFileName,
                    $paymentUrl
                )
            );
        } catch (Throwable $e) {
            Log::error('InvoiceController@sendMail failed', [
                'invoice_id'     => $id,
                'invoice_number' => $invoice->invoice_number ?? null,
                'customer_email' => $customer->email,
                'type'           => $type,
                'error'          => $e->getMessage(),
            ]);

            return response()->json([
                'error'   => true,
                'message' => 'Không thể gửi email: ' . $e->getMessage(),
            ], 500);
        }

        return response()->json([
            'error'   => false,
            'message' => "Email đã được gửi tới {$customer->email}",
        ]);
    }
}