<?php

declare(strict_types=1);

namespace App\Repositories;

use App\Models\Invoice;
use App\Models\Quote;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class InvoiceRepository extends BaseRepository implements InvoiceRepositoryInterface
{
    public function __construct(
        Invoice $model,
        protected InvoiceLineRepositoryInterface $invoiceLineRepository
    ) {
        parent::__construct($model);
    }
    
    public function createFromQuote(int|string $quoteId): Invoice
    {
        return DB::transaction(function () use ($quoteId) {
            // Resolve Quote directly to avoid circular dependency
            $quote = Quote::with(['client', 'lines'])->find($quoteId);
            
            if (!$quote) {
                throw new \Exception("Quote not found");
            }

            // Create Invoice
            $invoiceData = [
                'client_id' => $quote->client_id,
                'group_id' => $quote->group_id,
                'source_quote_id' => $quote->id,
                'status' => 'brouillon', // Start as draft
                'invoice_date' => now(),
                'currency' => $quote->currency,
                'total_ht' => $quote->total_ht,
                'total_tva' => $quote->total_tva,
                'total_ttc' => $quote->total_ttc,
            ];

            $invoice = parent::create($invoiceData);

            // Copy Lines
            foreach ($quote->lines as $line) {
                $this->invoiceLineRepository->create([
                    'invoice_id' => $invoice->id,
                    'product_id' => $line->product_id,
                    'packaging_id' => $line->packaging_id,
                    'packages_qty' => $line->packages_qty,
                    'units_qty' => $line->units_qty,
                    'description' => $line->description,
                    'qty_base' => $line->qty_base,
                    'unit_price' => $line->unit_price,
                    'unit_price_per_package' => $line->unit_price_per_package,
                    'tva_rate_id' => $line->tva_rate_id,
                    'discount_pct' => $line->discount_pct,
                    'total_ht' => $line->total_ht,
                ]);
            }
            
            // Record history
            $this->recordHistory($invoice->id, null, 'brouillon', 'Created from Quote ' . $quote->reference);

            return $invoice;
        });
    }


    public function all(array $columns = ['*']): \Illuminate\Support\Collection
    {
        return $this->model->with(['client', 'lines.product'])->get($columns);
    }

    public function create(array $data): Invoice
    {
        return DB::transaction(function () use ($data) {
            try {
                // Create the invoice
                $invoice = parent::create($data);

                // Create the invoice lines
                if (isset($data['lines']) && is_array($data['lines'])) {
                    foreach ($data['lines'] as $lineData) {
                        $lineData['invoice_id'] = $invoice->id;
                        $this->invoiceLineRepository->create($lineData);
                    }
                }

                // Record initial status history
                $this->recordHistory($invoice->id, null, $invoice->status, 'Invoice created');

                return $invoice;
            } catch (\Exception $e) {
                Log::error('Error creating invoice with lines: ' . $e->getMessage(), [
                    'exception' => $e,
                    'data' => $data,
                ]);
                throw $e;
            }
        });
    }

    public function update(int|string $id, array $attributes): bool
    {
        return DB::transaction(function () use ($id, $attributes) {
            try {
                $invoice = $this->find($id);
                if (!$invoice) {
                    return false;
                }

                $oldStatus = $invoice->status;
                
                // Update the invoice
                $updated = parent::update($id, $attributes);

                if ($updated) {
                    $newStatus = $attributes['status'] ?? $oldStatus;
                    
                    // If status changed, record history
                    if ($oldStatus !== $newStatus) {
                         $this->recordHistory((int) $id, $oldStatus, $newStatus, 'Invoice status updated');
                    }
                }

                return $updated;
            } catch (\Exception $e) {
                Log::error('Error updating invoice: ' . $e->getMessage(), [
                    'id' => $id,
                    'attributes' => $attributes,
                    'exception' => $e,
                ]);
                throw $e;
            }
        });
    }

    public function find(int|string $id, array $columns = ['*']): ?Invoice
    {
        return $this->model->with(['client', 'lines.product', 'history.user'])->find($id, $columns);
    }

    private function recordHistory(int $invoiceId, ?string $oldStatus, string $newStatus, ?string $comment = null): void
    {
        \App\Models\DocumentStatusHistory::create([
            'document_type' => 'invoice',
            'document_id' => $invoiceId,
            'old_status' => $oldStatus,
            'new_status' => $newStatus,
            'changed_by' => auth()->id(), // Assuming authenticated user
            'comment' => $comment,
            'changed_at' => now(),
        ]);
    }
}