<?php

namespace App\Http\Controllers;

use App\Models\AppSetting;
use App\Models\CalendarioConnessione;
use App\Models\Documento;
use App\Models\EmailSetting;
use App\Models\Ruolo;
use App\Models\SenderAccount;
use App\Models\StorageRepository;
use App\Models\Tag;
use App\Models\TipologiaDocumento;
use App\Models\TipologiaEvento;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;

class ImpostazioniController extends Controller
{
    public function index()
    {
        $this->authorizeWrite('settings');

        $tipologie = TipologiaDocumento::orderBy('ordine')->get();
        $tipologieEventi = TipologiaEvento::orderBy('ordine')->get();
        $ruoli = Ruolo::orderBy('ordine')->get();
        $tags = Tag::orderBy('order_column')->get();
        $appSettings = AppSetting::first();
        $emailSettings = EmailSetting::first() ?? new EmailSetting();
        $senderAccounts = SenderAccount::orderBy('email_address')->get();
        $repositories = StorageRepository::orderBy('ordine')->get();
        $googleDriveNewToken = session('google_drive_new_token');
        $calendarioConnessioni = CalendarioConnessione::orderBy('ordine')->get();

        return view('impostazioni.index', compact('tipologie', 'tipologieEventi', 'ruoli', 'tags', 'appSettings', 'emailSettings', 'senderAccounts', 'repositories', 'googleDriveNewToken', 'calendarioConnessioni'));
    }

    public function saveAppSettings(Request $request)
    {
        $this->authorizeWrite('settings');

        $validated = $request->validate([
            'nome_applicazione' => 'nullable|string|max:100',
            'nome_organizzazione' => 'nullable|string|max:255',
            'footer_text' => 'nullable|string|max:255',
            'app_version' => 'nullable|string|max:50',
            'dashboard_welcome' => 'nullable|string|max:1000',
            'show_version' => 'boolean',
            'documenti_storage_disk' => 'nullable|string|in:local,public',
            'documenti_storage_path' => 'nullable|string|max:255',
        ]);

        $settings = AppSetting::first() ?? new AppSetting();

        $oldDisk = $settings->documenti_storage_disk ?? 'local';
        $oldPath = $settings->documenti_storage_path ?? 'documenti';
        
        $settings->nome_applicazione = $validated['nome_applicazione'] ?? $settings->nome_applicazione ?? '';
        $settings->nome_organizzazione = $validated['nome_organizzazione'] ?? $settings->nome_organizzazione ?? '';
        $settings->footer_text = $validated['footer_text'] ?? $settings->footer_text ?? '';
        $settings->app_version = $validated['app_version'] ?? $settings->app_version ?? '';
        $settings->dashboard_welcome = $validated['dashboard_welcome'] ?? $settings->dashboard_welcome ?? null;
        $settings->show_version = $request->boolean('show_version');
        $settings->documenti_storage_disk = $validated['documenti_storage_disk'] ?? $settings->documenti_storage_disk ?? 'local';
        $settings->documenti_storage_path = $validated['documenti_storage_path'] ?? $settings->documenti_storage_path ?? 'documenti';
        
        $settings->save();

        $newDisk = $settings->documenti_storage_disk;
        $newPath = $settings->documenti_storage_path;

        $pathChanged = $oldDisk !== $newDisk || $oldPath !== $newPath;

        if ($pathChanged) {
            try {
                Storage::disk($newDisk)->makeDirectory($newPath);
            } catch (\Exception $e) {
                Log::error('Creazione directory documenti fallita: ' . $e->getMessage());
            }

            $fileCount = Documento::whereNull('repository_id')->count();

            return redirect('/impostazioni#documenti')
                ->with('success', 'Percorso di archiviazione aggiornato. La nuova directory è stata creata.')
                ->with('path_changed', true)
                ->with('old_storage_disk', $oldDisk)
                ->with('old_storage_path', $oldPath)
                ->with('new_storage_disk', $newDisk)
                ->with('new_storage_path', $newPath)
                ->with('migration_count', $fileCount);
        }

        return redirect('/impostazioni#applicazione')->with('success', 'Impostazioni applicazione salvate.');
    }

    public function migrateStoragePath(Request $request)
    {
        $this->authorizeWrite('settings');

        $oldDisk = $request->input('old_storage_disk', 'local');
        $oldPath = $request->input('old_storage_path', 'documenti');
        $newDisk = $request->input('new_storage_disk', 'local');
        $newPath = $request->input('new_storage_path', 'documenti');

        $documents = Documento::whereNull('repository_id')->get();
        $moved = 0;
        $errors = [];

        foreach ($documents as $doc) {
            $oldFilePath = $doc->file_path;
            $relativePath = $oldFilePath;

            if (str_starts_with($relativePath, $oldPath . '/') || $relativePath === $oldPath) {
                $relativePath = substr($relativePath, strlen($oldPath));
                $relativePath = ltrim($relativePath, '/');
            }

            $newFilePath = $newPath . ($relativePath ? '/' . $relativePath : '');

            if ($newFilePath === $oldFilePath && $oldDisk === $newDisk) {
                continue;
            }

            try {
                if (!Storage::disk($oldDisk)->exists($oldFilePath)) {
                    $errors[] = "File non trovato: {$oldFilePath}";
                    continue;
                }

                Storage::disk($newDisk)->writeStream(
                    $newFilePath,
                    Storage::disk($oldDisk)->readStream($oldFilePath)
                );

                $doc->update([
                    'file_path' => $newFilePath,
                    'storage_disk' => $newDisk,
                ]);

                Storage::disk($oldDisk)->delete($oldFilePath);

                $moved++;
            } catch (\Exception $e) {
                $errors[] = "Errore su {$oldFilePath}: " . $e->getMessage();
                Log::error('Migrazione file fallita: ' . $e->getMessage(), [
                    'doc_id' => $doc->id,
                    'old' => $oldFilePath,
                    'new' => $newFilePath,
                ]);
            }
        }

        $message = "Migrazione completata: {$moved} file spostati.";
        if (count($errors) > 0) {
            $message .= ' ' . count($errors) . ' errori. Controlla i log per i dettagli.';
        }

        return redirect('/impostazioni#documenti')
            ->with('success', $message)
            ->with('migration_errors', count($errors) > 0 ? $errors : null);
    }

    public function tipologieStore(Request $request)
    {
        $this->authorizeWrite('settings');

        $validated = $request->validate([
            'nome' => 'required|string|max:50|unique:tipologie_documenti,nome',
            'descrizione' => 'nullable|string|max:255',
        ]);

        $maxOrdine = TipologiaDocumento::max('ordine') ?? 0;

        TipologiaDocumento::create([
            'nome' => $validated['nome'],
            'descrizione' => $validated['descrizione'] ?? null,
            'ordine' => $maxOrdine + 1,
            'attiva' => true,
        ]);

        return redirect('/impostazioni#tipologie')->with('success', 'Tipologia aggiunta.');
    }

    public function tipologieUpdate(Request $request, $id)
    {
        $this->authorizeWrite('settings');

        $tipologia = TipologiaDocumento::findOrFail($id);

        $validated = $request->validate([
            'nome' => 'required|string|max:50|unique:tipologie_documenti,nome,' . $id,
            'descrizione' => 'nullable|string|max:255',
            'attiva' => 'boolean',
        ]);

        $tipologia->update($validated);

        return redirect('/impostazioni#tipologie')->with('success', 'Tipologia aggiornata.');
    }

    public function tipologieDestroy($id)
    {
        $this->authorizeDelete('settings');
        $tipologia = TipologiaDocumento::findOrFail($id);

        $count = $tipologia->documenti()->count();
        if ($count > 0) {
            return redirect('/impostazioni#tipologie')->with('error', 'Impossibile eliminare: ' . $count . ' documenti associati.');
        }

        $tipologia->delete();

        return redirect('/impostazioni#tipologie')->with('success', 'Tipologia eliminata.');
    }

    public function tipologieReorder(Request $request)
    {
        $this->authorizeWrite('settings');

        $order = $request->input('order', []);

        foreach ($order as $index => $id) {
            TipologiaDocumento::where('id', $id)->update(['ordine' => $index]);
        }

        return response()->json(['success' => true]);
    }

    public function ruoliStore(Request $request)
    {
        $this->authorizeWrite('settings');

        $validated = $request->validate([
            'nome' => 'required|string|max:50|unique:ruoli,nome',
            'descrizione' => 'nullable|string|max:255',
        ]);

        $maxOrdine = Ruolo::max('ordine') ?? 0;

        Ruolo::create([
            'nome' => $validated['nome'],
            'descrizione' => $validated['descrizione'] ?? null,
            'ordine' => $maxOrdine + 1,
            'attiva' => true,
        ]);

        return redirect('/impostazioni#ruoli')->with('success', 'Ruolo aggiunto.');
    }

    public function ruoliUpdate(Request $request, $id)
    {
        $this->authorizeWrite('settings');

        $ruolo = Ruolo::findOrFail($id);

        $validated = $request->validate([
            'nome' => 'required|string|max:50|unique:ruoli,nome,' . $id,
            'descrizione' => 'nullable|string|max:255',
            'attiva' => 'boolean',
        ]);

        $ruolo->update($validated);

        return redirect('/impostazioni#ruoli')->with('success', 'Ruolo aggiornato.');
    }

    public function ruoliDestroy($id)
    {
        $this->authorizeDelete('settings');

        $ruolo = Ruolo::findOrFail($id);

        $allRows = \DB::table('gruppo_individuo')
            ->whereNotNull('ruolo_ids')
            ->get(['id', 'ruolo_ids']);
        
        $count = 0;
        foreach ($allRows as $row) {
            $ids = json_decode($row->ruolo_ids, true);
            if (is_array($ids) && in_array((int) $id, $ids)) {
                $count++;
            }
        }

        if ($count > 0) {
            return redirect('/impostazioni#ruoli')->with('error', 'Impossibile eliminare: ' . $count . ' membri associati a questo ruolo.');
        }

        $ruolo->delete();

        return redirect('/impostazioni#ruoli')->with('success', 'Ruolo eliminato.');
    }

    public function ruoliReorder(Request $request)
    {
        $this->authorizeWrite('settings');

        $order = $request->input('order', []);

        foreach ($order as $index => $id) {
            Ruolo::where('id', $id)->update(['ordine' => $index]);
        }

        return response()->json(['success' => true]);
    }

    public function tipologieEventiStore(Request $request)
    {
        $this->authorizeWrite('settings');

        $validated = $request->validate([
            'nome' => 'required|string|max:50|unique:tipologie_eventi,nome',
            'descrizione' => 'nullable|string|max:255',
        ]);

        $maxOrdine = TipologiaEvento::max('ordine') ?? 0;

        TipologiaEvento::create([
            'nome' => $validated['nome'],
            'descrizione' => $validated['descrizione'] ?? null,
            'ordine' => $maxOrdine + 1,
            'attiva' => true,
        ]);

        return redirect('/impostazioni#tipologie-eventi')->with('success', 'Tipologia evento aggiunta.');
    }

    public function tipologieEventiUpdate(Request $request, $id)
    {
        $this->authorizeWrite('settings');

        $tipologia = TipologiaEvento::findOrFail($id);

        $validated = $request->validate([
            'nome' => 'required|string|max:50|unique:tipologie_eventi,nome,' . $id,
            'descrizione' => 'nullable|string|max:255',
            'attiva' => 'boolean',
        ]);

        $tipologia->update($validated);

        return redirect('/impostazioni#tipologie-eventi')->with('success', 'Tipologia evento aggiornata.');
    }

    public function tipologieEventiDestroy($id)
    {
        $this->authorizeDelete('settings');
        $tipologia = TipologiaEvento::findOrFail($id);

        $count = $tipologia->eventi()->count();
        if ($count > 0) {
            return redirect('/impostazioni#tipologie-eventi')->with('error', 'Impossibile eliminare: ' . $count . ' eventi associati.');
        }

        $tipologia->delete();

        return redirect('/impostazioni#tipologie-eventi')->with('success', 'Tipologia evento eliminata.');
    }

    public function tipologieEventiReorder(Request $request)
    {
        $this->authorizeWrite('settings');

        $order = $request->input('order', []);

        foreach ($order as $index => $id) {
            TipologiaEvento::where('id', $id)->update(['ordine' => $index]);
        }

        return response()->json(['success' => true]);
    }

    public function tagStore(Request $request)
    {
        $this->authorizeWrite('settings');

        $validated = $request->validate([
            'name' => 'required|string|max:100|unique:tags,name',
            'color' => 'nullable|string|max:7',
        ]);

        $maxOrdine = Tag::max('order_column') ?? 0;

        Tag::create([
            'name' => $validated['name'],
            'slug' => str()->slug($validated['name']),
            'color' => $validated['color'] ?? null,
            'order_column' => $maxOrdine + 1,
        ]);

        return redirect('/impostazioni#tag')->with('success', 'Tag aggiunto.');
    }

    public function tagUpdate(Request $request, $id)
    {
        $this->authorizeWrite('settings');

        $tag = Tag::findOrFail($id);

        $validated = $request->validate([
            'name' => 'required|string|max:100|unique:tags,name,' . $id,
            'color' => 'nullable|string|max:7',
        ]);

        $tag->update([
            'name' => $validated['name'],
            'slug' => str()->slug($validated['name']),
            'color' => $validated['color'] ?? null,
        ]);

        return redirect('/impostazioni#tag')->with('success', 'Tag aggiornato.');
    }

    public function tagDestroy($id)
    {
        $this->authorizeDelete('settings');

        $tag = Tag::findOrFail($id);
        $tag->delete();

        return redirect('/impostazioni#tag')->with('success', 'Tag eliminato.');
    }

    public function tagReorder(Request $request)
    {
        $this->authorizeWrite('settings');

        $order = $request->input('order', []);

        foreach ($order as $index => $id) {
            Tag::where('id', $id)->update(['order_column' => $index]);
        }

        return response()->json(['success' => true]);
    }

    public function uploadLogo(Request $request)
    {
        $this->authorizeWrite('settings');

        $request->validate([
            'logo' => 'nullable|image|mimes:png,jpg,jpeg,gif,svg|max:2048',
            'logo_small' => 'nullable|image|mimes:png,jpg,jpeg,gif,svg|max:512',
        ]);

        $settings = AppSetting::first() ?? new AppSetting();

        if ($request->hasFile('logo')) {
            $path = $request->file('logo')->store('logos', 'public');
            $settings->logo_path = $path;
        }

        if ($request->hasFile('logo_small')) {
            $path = $request->file('logo_small')->store('logos', 'public');
            $settings->logo_small_path = $path;
        }

        if ($settings->id) {
            $settings->save();
        } else {
            $settings->save();
        }

        $linkPath = public_path('storage');
        if (!file_exists($linkPath) && !is_link($linkPath)) {
            try {
                symlink(storage_path('app/public'), $linkPath);
            } catch (\Throwable $e) {
                Log::warning('Impossibile creare symlink storage: ' . $e->getMessage());
            }
        }

        return redirect('/impostazioni#logo')->with('success', 'Logo caricato con successo.');
    }

    public function removeLogo(Request $request)
    {
        $this->authorizeWrite('settings');

        $type = $request->input('type');

        $settings = AppSetting::first();

        if ($settings) {
            if ($type === 'logo') {
                if ($settings->logo_path) {
                    Storage::disk('public')->delete($settings->logo_path);
                    $settings->logo_path = null;
                }
            } elseif ($type === 'logo_small') {
                if ($settings->logo_small_path) {
                    Storage::disk('public')->delete($settings->logo_small_path);
                    $settings->logo_small_path = null;
                }
            }
            $settings->save();
        }

        return response()->json(['success' => true]);
    }
}