<?php

namespace App\Services\Admin\Finance;

use App\Enums\CashTransactionType;
use App\Models\CashAccount;
use App\Models\Expense;
use App\Services\Concerns\HandlesCashTransactions;
use App\Services\Concerns\RegistersMedia;
use App\Services\NotificationService;
use App\Services\S3PresignedService;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class ExpenseService
{
    use HandlesCashTransactions, RegistersMedia;

    public function __construct(
        private S3PresignedService $s3Service,
    ) {}

    public function getAll(array $filters = []): Collection
    {
        return Expense::select(['id', 'created_by_id', 'amount', 'description', 'created_at'])
            ->with('createdBy.userProfile', 'media')
            ->latest()
            ->get()
            ->map(fn (Expense $expense) => $this->formatExpense($expense));
    }

    public function paginated(int $perPage = 25, string $search = '', string $sort = 'created_at', string $direction = 'desc', array $filters = []): LengthAwarePaginator
    {
        $paginator = Expense::query()
            ->select(['id', 'created_by_id', 'amount', 'description', 'created_at'])
            ->with('createdBy.userProfile', 'media')
            ->when($search, fn ($q) => $q->where('description', 'like', "%{$search}%"))
            ->orderBy($sort, $direction)
            ->paginate($perPage);

        $paginator->getCollection()->transform(fn (Expense $expense) => $this->formatExpense($expense));

        return $paginator;
    }

    private function formatExpense(Expense $expense): array
    {
        $media = $expense->getFirstMedia('receipts');

        if (! $media) {
            return $expense->toArray() + [
                'receipt_key' => null,
                'receipt_url' => null,
            ];
        }

        $s3Key = $media->file_name;

        // Handle old data where file_name is just the filename, not full path
        if (str_starts_with($s3Key, '/') || ! str_contains($s3Key, '/')) {
            $s3Key = $media->getPath();
        }

        $cacheKey = "expense_receipt_{$media->id}";
        $receiptUrl = Cache::remember($cacheKey, now()->addMinutes(55), function () use ($s3Key) {
            return $this->s3Service->getTemporaryUrl($s3Key);
        });

        return $expense->toArray() + [
            'receipt_key' => $s3Key,
            'receipt_url' => $receiptUrl,
        ];
    }

    public function create(array $data): Expense
    {
        $expense = DB::transaction(function () use ($data) {
            $cashTransaction = $this->debitCash(
                amount: $data['amount'],
                description: $data['description'],
            );

            $expense = Expense::create([
                'cash_transaction_id' => $cashTransaction->id,
                'created_by_id' => auth()->id(),
                'amount' => $data['amount'],
                'description' => $data['description'],
            ]);

            if (! empty($data['receipt_key'])) {
                $this->registerMedia($expense, $data['receipt_key'], 'receipts', ['thumb' => true], $data['file_size'] ?? null, $data['file_mime_type'] ?? null);
            }

            return $expense;
        });

        NotificationService::notify(
            roles: ['Owner', 'Developer', 'Direktur', 'Admin Toko'],
            title: 'Pengeluaran Baru',
            body: 'Pengeluaran sebesar Rp '.number_format($data['amount'], 0, ',', '.').' berhasil dicatat'.' oleh '.auth()->user()->full_name.'.',
            url: route('admin.finance.expenses.index'),
        );

        return $expense;
    }

    public function update(Expense $expense, array $data): Expense
    {
        $expense = DB::transaction(function () use ($expense, $data) {
            $cashAccount = CashAccount::firstOrFail();
            $cashTransaction = $expense->cashTransaction;

            $oldAmount = $expense->amount;
            $newAmount = $data['amount'];
            $difference = $newAmount - $oldAmount;

            if ($difference > 0 && $cashAccount->balance < $difference) {
                throw ValidationException::withMessages([
                    'amount' => 'Saldo tidak mencukupi.',
                ]);
            }

            $newBalance = $cashAccount->balance - $difference;
            $cashAccount->update(['balance' => $newBalance]);

            $cashTransaction->update([
                'amount' => $newAmount,
                'balance_after' => $newBalance,
                'description' => $data['description'],
            ]);

            $expense->update([
                'amount' => $newAmount,
                'description' => $data['description'],
            ]);

            if (array_key_exists('receipt_key', $data)) {
                $currentMedia = $expense->getFirstMedia('receipts');
                $currentKey = $currentMedia?->file_name;

                // Normalize: if file_name is just a filename (old data), use getPath()
                if ($currentMedia && ! str_contains($currentKey, '/')) {
                    $currentKey = $currentMedia->getPath();
                }

                if ($data['receipt_key'] !== $currentKey) {
                    // Invalidate old receipt cache
                    if ($currentMedia) {
                        Cache::forget("expense_receipt_{$currentMedia->id}");
                    }

                    $expense->clearMediaCollection('receipts');

                    if (! empty($data['receipt_key'])) {
                        $this->registerMedia($expense, $data['receipt_key'], 'receipts', ['thumb' => true], $data['file_size'] ?? null, $data['file_mime_type'] ?? null);
                    }
                }
            }

            return $expense;
        });

        NotificationService::notify(
            roles: ['Owner', 'Developer', 'Direktur', 'Admin Toko'],
            title: 'Pengeluaran Diperbarui',
            body: 'Pengeluaran sebesar Rp '.number_format($expense->amount, 0, ',', '.').' berhasil diperbarui'.' oleh '.auth()->user()->full_name.'.',
            url: route('admin.finance.expenses.index'),
        );

        return $expense;
    }

    public function delete(Expense $expense): bool
    {
        return DB::transaction(function () use ($expense) {
            $this->creditCash(
                amount: $expense->amount,
                description: 'Pembatalan pengeluaran: '.$expense->description,
                type: CashTransactionType::DEPOSIT,
            );

            // Invalidate receipt cache
            $media = $expense->getFirstMedia('receipts');
            if ($media) {
                Cache::forget("expense_receipt_{$media->id}");
            }

            $expense->clearMediaCollection('receipts');

            $deleted = $expense->delete();

            if ($deleted) {
                NotificationService::notify(
                    roles: ['Owner', 'Developer', 'Direktur', 'Admin Toko'],
                    title: 'Pengeluaran Dihapus',
                    body: 'Pengeluaran sebesar Rp '.number_format($expense->amount, 0, ',', '.').' berhasil dihapus'.' oleh '.auth()->user()->full_name.'.',
                    url: route('admin.finance.expenses.index'),
                );
            }

            return $deleted;
        });
    }
}