<?php

declare(strict_types=1);

namespace Modules\Helpdesk\Http\Controllers;

use Illuminate\Contracts\Filesystem\FileNotFoundException;
use Illuminate\Http\RedirectResponse;
use Illuminate\View\View;
use Illuminate\Routing\Controller;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Gate;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Facades\Storage;
use Modules\Helpdesk\Models\Ticket;
use Symfony\Component\HttpFoundation\StreamedResponse;

final class AttachmentDownloadController extends Controller
{
    /**
     * Download a ticket attachment through Laravel storage instead of a public URL.
     *
     * This avoids broken public storage links and keeps ticket authorization enforced.
     *
     * @throws FileNotFoundException
     */
    public function __invoke(int $attachment): StreamedResponse|RedirectResponse
    {
        abort_unless(Schema::hasTable('helpdesk_attachments'), 404);

        $row = DB::table('helpdesk_attachments')->where('id', $attachment)->first();

        abort_if($row === null, 404);

        $ticketId = $row->ticket_id ?? null;

        if ($ticketId !== null) {
            $ticket = Ticket::query()->findOrFail((int) $ticketId);
            Gate::authorize('view', $ticket);
        }

        $disk = (string) ($row->disk ?? 'public');
        $path = (string) ($row->path ?? $row->file_path ?? $row->stored_path ?? '');
        $name = (string) ($row->original_name
            ?? $row->original_filename
            ?? $row->file_name
            ?? $row->filename
            ?? basename($path));

        abort_if($path === '', 404);
        abort_unless(Storage::disk($disk)->exists($path), 404);

        if (Schema::hasColumn('helpdesk_attachments', 'download_count') && Schema::hasColumn('helpdesk_attachments', 'last_downloaded_at')) {
            DB::table('helpdesk_attachments')
                ->where('id', $attachment)
                ->update([
                    'download_count' => DB::raw('download_count + 1'),
                    'last_downloaded_at' => now(),
                ]);
        }

        return Storage::disk($disk)->download($path, $name);
    }

    /**
     * Preview a safe Helpdesk attachment using this existing controller so optimized
     * Composer autoload does not need a newly introduced route action class.
     *
     * @throws FileNotFoundException
     */
    public function preview(int $attachment): View|StreamedResponse|RedirectResponse
    {
        abort_unless(Schema::hasTable('helpdesk_attachments'), 404);

        $row = DB::table('helpdesk_attachments')->where('id', $attachment)->first();

        abort_if($row === null, 404);

        $ticketId = $row->ticket_id ?? null;

        if ($ticketId !== null) {
            $ticket = Ticket::query()->findOrFail((int) $ticketId);
            Gate::authorize('view', $ticket);
        }

        $disk = (string) ($row->disk ?? 'public');
        $path = (string) ($row->path ?? $row->file_path ?? $row->stored_path ?? '');
        $name = (string) ($row->original_name
            ?? $row->original_filename
            ?? $row->file_name
            ?? $row->filename
            ?? basename($path));
        $mimeType = (string) ($row->mime_type ?? 'application/octet-stream');
        $extension = strtolower((string) (($row->extension ?? null) ?: pathinfo($name, PATHINFO_EXTENSION)));

        abort_if($path === '', 404);
        abort_unless(Storage::disk($disk)->exists($path), 404);

        if ($this->isSourceExtension($extension)) {
            $contents = Storage::disk($disk)->get($path);

            return view('helpdesk::attachments.source-preview', [
                'attachment' => $row,
                'contents' => is_string($contents) ? $contents : '',
                'language' => $this->languageForExtension($extension),
            ]);
        }

        abort_unless($this->isInlinePreviewable($extension, $mimeType), 404);

        return Storage::disk($disk)->response($path, $name, [
            'Content-Disposition' => 'inline; filename="' . addslashes($name) . '"',
            'X-Content-Type-Options' => 'nosniff',
        ]);
    }

    /**
     * Soft-delete or remove an attachment using this existing controller class.
     */
    public function destroy(int $attachment): RedirectResponse
    {
        abort_unless(Schema::hasTable('helpdesk_attachments'), 404);

        $row = DB::table('helpdesk_attachments')->where('id', $attachment)->first();

        abort_if($row === null, 404);

        $ticketId = $row->ticket_id ?? null;
        abort_if($ticketId === null, 404);

        $ticket = Ticket::query()->findOrFail((int) $ticketId);
        Gate::authorize('update', $ticket);

        if (Schema::hasColumn('helpdesk_attachments', 'deleted_at')) {
            DB::table('helpdesk_attachments')
                ->where('id', $attachment)
                ->update(array_filter([
                    'deleted_at' => now(),
                    'deleted_by' => Schema::hasColumn('helpdesk_attachments', 'deleted_by') ? (int) auth()->id() : null,
                ], static fn (mixed $value): bool => $value !== null));
        } else {
            Storage::disk((string) ($row->disk ?? 'public'))->delete((string) ($row->path ?? ''));
            DB::table('helpdesk_attachments')->where('id', $attachment)->delete();
        }

        return redirect()
            ->route('helpdesk.tickets.show', $ticket)
            ->with('ticket-attachments-deleted', 'Attachment removed.');
    }

    /**
     * Determine whether a file can be safely streamed inline by extension or MIME type.
     */
    private function isInlinePreviewable(string $extension, string $mimeType): bool
    {
        return in_array($extension, ['png', 'jpg', 'jpeg', 'webp', 'gif', 'pdf'], true)
            || str_starts_with($mimeType, 'image/')
            || $mimeType === 'application/pdf';
    }

    /**
     * Determine whether a source/configuration file can use the read-only viewer.
     */
    private function isSourceExtension(string $extension): bool
    {
        return in_array($extension, config('helpdesk.allowed_source_extensions', [
            'php', 'phtml', 'phps', 'js', 'jsx', 'ts', 'tsx', 'vue', 'css', 'scss', 'sass', 'less',
            'html', 'htm', 'xml', 'json', 'yaml', 'yml', 'sql', 'sh', 'bash', 'zsh', 'ps1', 'bat', 'cmd',
            'py', 'rb', 'go', 'rs', 'java', 'kt', 'kts', 'cs', 'cpp', 'c', 'h', 'hpp', 'swift', 'dart',
            'rpg', 'rpgle', 'cl', 'clle', 'cbl', 'cob', 'copybook', 'inc', 'env', 'ini', 'conf', 'config', 'txt', 'log', 'md',
        ]), true);
    }

    /**
     * Return the source preview language key for display/highlighting.
     */
    private function languageForExtension(string $extension): string
    {
        return match ($extension) {
            'php', 'phtml', 'phps' => 'php',
            'js', 'jsx' => 'javascript',
            'ts', 'tsx' => 'typescript',
            'vue' => 'vue',
            'css', 'scss', 'sass', 'less' => 'css',
            'html', 'htm' => 'html',
            'xml' => 'xml',
            'json' => 'json',
            'yaml', 'yml' => 'yaml',
            'sql' => 'sql',
            'sh', 'bash', 'zsh' => 'shell',
            'ps1' => 'powershell',
            'py' => 'python',
            'java', 'kt', 'kts' => 'java',
            'c', 'h', 'cpp', 'hpp', 'cs' => 'c-like',
            'rpg', 'rpgle' => 'rpgle',
            'cl', 'clle' => 'clle',
            'cbl', 'cob', 'copybook' => 'cobol',
            default => 'text',
        };
    }

}