<?php

declare(strict_types=1);

namespace App\Repositories;

use App\Models\File;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Database\Eloquent\Collection;

class FileRepository extends BaseRepository implements FileRepositoryInterface
{
    public function __construct(File $model)
    {
        parent::__construct($model);
    }

    /**
     * Get paginated files with filtering
     */
    public function paginate(int $perPage = 15, array $filters = []): LengthAwarePaginator
    {
        $query = $this->model->newQuery();

        // Apply filters
        if (!empty($filters['search'])) {
            $query->where('file_name', 'like', '%' . $filters['search'] . '%');
        }

        if (!empty($filters['mime_type'])) {
            $query->where('mime_type', 'like', '%' . $filters['mime_type'] . '%');
        }

        if (!empty($filters['uploaded_by'])) {
            $query->where('uploaded_by', $filters['uploaded_by']);
        }

        if (!empty($filters['category'])) {
            // Extract category from storage_uri path
            $query->where('storage_uri', 'like', '%/' . $filters['category'] . '/%');
        }

        if (!empty($filters['client_id'])) {
            // Extract client files from storage path
            $query->where('storage_uri', 'like', '%/client/' . $filters['client_id'] . '/%');
        }

        // Date range filter
        if (!empty($filters['date_from'])) {
            $query->whereDate('uploaded_at', '>=', $filters['date_from']);
        }

        if (!empty($filters['date_to'])) {
            $query->whereDate('uploaded_at', '<=', $filters['date_to']);
        }

        // Apply sorting
        $sortField = $filters['sort_by'] ?? 'uploaded_at';
        $sortDirection = $filters['sort_direction'] ?? 'desc';
        $query->orderBy($sortField, $sortDirection);

        return $query->paginate($perPage);
    }

    /**
     * Get files by category/type (e.g., devis, facture)
     */
    public function getByCategory(string $category, int $perPage = 15): LengthAwarePaginator
    {
        return $this->model->newQuery()
            ->where('storage_uri', 'like', '%/' . $category . '/%')
            ->orderBy('uploaded_at', 'desc')
            ->paginate($perPage);
    }

    /**
     * Get files by client ID
     */
    public function getByClient(int $clientId, int $perPage = 15): LengthAwarePaginator
    {
        return $this->model->newQuery()
            ->where('storage_uri', 'like', '%/client/' . $clientId . '/%')
            ->orderBy('uploaded_at', 'desc')
            ->paginate($perPage);
    }

    /**
     * Get files by user/uploader
     */
    public function getByUploader(int $uploaderId, int $perPage = 15): LengthAwarePaginator
    {
        return $this->model->newQuery()
            ->where('uploaded_by', $uploaderId)
            ->orderBy('uploaded_at', 'desc')
            ->paginate($perPage);
    }

    /**
     * Search files by filename
     */
    public function search(string $searchTerm, int $perPage = 15): LengthAwarePaginator
    {
        return $this->model->newQuery()
            ->where('file_name', 'like', '%' . $searchTerm . '%')
            ->orWhere('storage_uri', 'like', '%' . $searchTerm . '%')
            ->orderBy('uploaded_at', 'desc')
            ->paginate($perPage);
    }

    /**
     * Get recent files
     */
    public function getRecent(int $limit = 10): Collection
    {
        return $this->model->newQuery()
            ->orderBy('uploaded_at', 'desc')
            ->limit($limit)
            ->get();
    }

    /**
     * Get files by storage path pattern
     */
    public function getByPathPattern(string $pattern, int $perPage = 15): LengthAwarePaginator
    {
        return $this->model->newQuery()
            ->where('storage_uri', 'like', '%' . $pattern . '%')
            ->orderBy('uploaded_at', 'desc')
            ->paginate($perPage);
    }

    /**
     * Get files organized by path structure
     */
    public function getOrganizedFiles(): Collection
    {
        $files = $this->model->newQuery()
            ->orderBy('storage_uri')
            ->get();

        // Group files by their organized path structure
        $organized = collect();

        foreach ($files as $file) {
            $pathParts = explode('/', $file->storage_uri);

            // Skip if not enough path parts
            if (count($pathParts) < 3) {
                continue;
            }

            // Extract structure like: category/subcategory/filename
            $category = $pathParts[count($pathParts) - 3] ?? 'root';
            $subcategory = $pathParts[count($pathParts) - 2] ?? 'general';

            $key = $category . '/' . $subcategory;

            if (!$organized->has($key)) {
                $organized->put($key, collect([
                    'category' => $category,
                    'subcategory' => $subcategory,
                    'files' => collect(),
                    'count' => 0
                ]));
            }

            $group = $organized->get($key);
            $group['files']->push($file);
            $group['count']++;
        }

        return $organized;
    }

    /**
     * Get storage usage statistics
     */
    public function getStorageStats(): array
    {
        $totalFiles = $this->model->newQuery()->count();
        $totalSize = $this->model->newQuery()->sum('size_bytes');

        $byType = $this->model->newQuery()
            ->selectRaw('mime_type, COUNT(*) as count, SUM(size_bytes) as total_size')
            ->groupBy('mime_type')
            ->get();

        $byCategory = $this->model->newQuery()
            ->selectRaw('storage_uri, COUNT(*) as count, SUM(size_bytes) as total_size')
            ->get()
            ->map(function ($item) {
                $pathParts = explode('/', $item->storage_uri);
                $category = $pathParts[count($pathParts) - 3] ?? 'root';
                return [
                    'category' => $category,
                    'count' => $item->count,
                    'total_size' => $item->total_size,
                ];
            })
            ->groupBy('category')
            ->map(function ($items) {
                return [
                    'count' => $items->sum('count'),
                    'total_size' => $items->sum('total_size'),
                ];
            });

        return [
            'total_files' => $totalFiles,
            'total_size_bytes' => $totalSize,
            'total_size_formatted' => $this->formatBytes($totalSize),
            'by_type' => $byType,
            'by_category' => $byCategory,
        ];
    }

    /**
     * Format bytes to human readable format
     */
    private function formatBytes(int $bytes, int $precision = 2): string
    {
        if ($bytes === 0) {
            return '0 B';
        }

        $units = ['B', 'KB', 'MB', 'GB', 'TB'];
        $base = 1024;
        $factor = floor((strlen($bytes) - 1) / 3);

        return sprintf("%.{$precision}f", $bytes / pow($base, $factor)) . ' ' . $units[$factor];
    }
}