<?php

namespace App\Http\Controllers;

use App\Models\PendingSync;
use App\Models\Phase;
use App\Models\Inspection;
use App\Models\Feature;
use App\Models\Media;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Storage;

class OfflineSyncController extends Controller
{
    /**
     * Allowed mediable model types (whitelist to prevent RCE via dynamic instantiation).
     */
    private const ALLOWED_MEDIABLE_TYPES = [
        'project'    => \App\Models\Project::class,
        'phase'      => \App\Models\Phase::class,
        'layer'      => \App\Models\Layer::class,
        'feature'    => \App\Models\Feature::class,
        'inspection' => \App\Models\Inspection::class,
        'issue'      => \App\Models\Issue::class,
    ];

    public function storePending(Request $request)
    {
        $payload = $request->validate([
            'action'  => 'required|in:progress_update,inspection,feature_create,media_upload,task_complete',
            'payload' => 'required|array',
        ]);
        PendingSync::create([
            'user_id' => Auth::id(),
            'action'  => $payload['action'],
            'payload' => $payload['payload'],
        ]);
        return response()->json(['queued' => true]);
    }

    public function sync(Request $request)
    {
        $user    = Auth::user();
        $pendings = PendingSync::where('user_id', $user->id)->whereNull('synced_at')->get();
        $results = [];

        foreach ($pendings as $pending) {
            $result = ['id' => $pending->id, 'action' => $pending->action, 'success' => false, 'error' => null];

            try {
                if ($pending->action === 'progress_update') {
                    $phaseId  = (int) ($pending->payload['phase_id'] ?? 0);
                    $progress = (int) ($pending->payload['progress'] ?? 0);
                    $progress = max(0, min(100, $progress));

                    $phase = Phase::find($phaseId);
                    if ($phase) {
                        // Verify user has access to this phase's project
                        if (!$user->hasRole('Admin') && !$phase->project->users()->where('user_id', $user->id)->exists()) {
                            $result['error'] = 'Access denied to this project.';
                        } else {
                            $phase->progress_percent = $progress;
                            $phase->save();
                            $phase->progressUpdates()->create([
                                'user_id'          => $user->id,
                                'progress_percent' => $progress,
                                'comment'          => substr($pending->payload['comment'] ?? '', 0, 500),
                            ]);
                            $result['success'] = true;
                        }
                    } else {
                        $result['error'] = 'Phase not found.';
                    }

                } elseif ($pending->action === 'inspection') {
                    $p = $pending->payload;
                    $inspection = Inspection::create([
                        'project_id'        => (int) ($p['project_id'] ?? 0),
                        'feature_id'        => isset($p['feature_id']) ? (int) $p['feature_id'] : null,
                        'layer_id'          => isset($p['layer_id'])   ? (int) $p['layer_id']   : null,
                        'template_id'       => isset($p['template_id'])? (int) $p['template_id']: null,
                        'user_id'           => $user->id,
                        'inspector_user_id' => $user->id,
                        'status'            => 'completed',
                        'completed_at'      => now(),
                        'result'            => in_array($p['result'] ?? '', Inspection::RESULTS) ? $p['result'] : null,
                        'notes'             => substr($p['notes'] ?? '', 0, 2000),
                        'data'              => is_array($p['data'] ?? null) ? $p['data'] : [],
                    ]);
                    $result['success'] = true;
                    $result['data']    = ['inspection_id' => $inspection->id];

                } elseif ($pending->action === 'feature_create') {
                    $p = $pending->payload;
                    $feature = Feature::create([
                        'layer_id'    => (int) ($p['layer_id'] ?? 0),
                        'name'        => substr($p['name'] ?? 'Elemento', 0, 255),
                        'geometry'    => is_array($p['geometry'] ?? null) ? $p['geometry'] : null,
                        'properties'  => is_array($p['properties'] ?? null) ? $p['properties'] : [],
                        'template_id' => isset($p['template_id']) ? (int) $p['template_id'] : null,
                        'progress'    => max(0, min(100, (int) ($p['progress'] ?? 0))),
                        'status'      => in_array($p['status'] ?? '', Feature::STATUSES) ? $p['status'] : 'planned',
                        'responsible' => isset($p['responsible']) ? substr($p['responsible'], 0, 255) : null,
                    ]);
                    $result['success'] = true;
                    $result['data']    = ['feature_id' => $feature->id];

                } elseif ($pending->action === 'media_upload') {
                    if (isset($pending->payload['file'], $pending->payload['path'])) {
                        // Restrict path to safe uploads directory
                        $safePath = 'uploads/' . ltrim(basename($pending->payload['path']), '/');
                        $decoded  = base64_decode($pending->payload['file'], true);

                        if ($decoded !== false) {
                            Storage::disk('public')->put($safePath, $decoded);

                            // Whitelist-based model type resolution (prevents RCE)
                            if (isset($pending->payload['model_type'], $pending->payload['model_id'])) {
                                $typeKey = strtolower(trim($pending->payload['model_type']));
                                if (array_key_exists($typeKey, self::ALLOWED_MEDIABLE_TYPES)) {
                                    $modelClass = self::ALLOWED_MEDIABLE_TYPES[$typeKey];
                                    $model = $modelClass::find((int) $pending->payload['model_id']);
                                    if ($model) {
                                        $model->media()->create([
                                            'name'            => substr($pending->payload['name'] ?? 'unnamed', 0, 255),
                                            'file_path'       => $safePath,
                                            'file_type'       => substr($pending->payload['mime_type'] ?? 'application/octet-stream', 0, 100),
                                            'file_extension'  => pathinfo($safePath, PATHINFO_EXTENSION),
                                            'file_size'       => strlen($decoded),
                                            'category'        => 'other',
                                            'uploaded_by'     => $user->id,
                                        ]);
                                    }
                                }
                            }
                            $result['success'] = true;
                            $result['data']    = ['path' => $safePath];
                        } else {
                            $result['error'] = 'Failed to decode base64 file.';
                        }
                    } else {
                        $result['error'] = 'Missing file or path in payload.';
                    }

                } elseif ($pending->action === 'task_complete') {
                    // No-op placeholder, just mark as synced
                    $result['success'] = true;

                } else {
                    $result['error'] = 'Unknown action type.';
                }
            } catch (\Exception $e) {
                $result['error'] = $e->getMessage();
            }

            if ($result['success']) {
                $pending->synced_at = now();
                $pending->save();
            }

            $results[] = $result;
        }

        return response()->json(['synced' => $results]);
    }
}