<?php

namespace App\Livewire;

use Livewire\Component;
use Livewire\WithFileUploads;
use Livewire\Attributes\Layout;
use App\Models\Project;
use App\Models\Phase;
use App\Models\Layer;
use App\Services\SpatialFileConverter;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Storage;

#[Layout('layouts.app')]
class LayerManager extends Component
{
    use WithFileUploads;

    public Project $project;
    public Phase $phase;
    public $layers;
    public $selectedLayer = null;
    public $visibleLayers = [];          // IDs de capas visibles

    public $uploadFile = null;
    public $layerName = '';
    public $layerColor = '#3b82f6';
    public $manualGeojson = null;
    public $drawingMode = false;

    protected $rules = [
        'uploadFile' => 'required|file|mimes:geojson,kmz,kml,shp,dwg,zip|max:51200',
        'layerName' => 'required|string|max:255',
        'layerColor' => 'nullable|string|size:7',
    ];

    public function mount(Project $project, Phase $phase)
    {
        $this->project = $project;
        $this->phase = $phase;
        $this->loadLayers();
        if ($this->phase->project_id !== $this->project->id) {
            abort(404);
        }
        // Por defecto todas visibles
        $this->visibleLayers = $this->layers->pluck('id')->toArray();
        $this->emitInitialLayersData();
    }

    public function loadLayers()
    {
        $this->layers = Layer::where('phase_id', $this->phase->id)->latest()->get();
        // Eliminar de visibles las que ya no existen
        $this->visibleLayers = array_intersect($this->visibleLayers, $this->layers->pluck('id')->toArray());
    }

    private function emitInitialLayersData()
    {
        $layersData = $this->layers->map(function($layer) {
            return [
                'id' => $layer->id,
                'geojson' => $layer->geojson_data,
                'color' => $layer->geojson_data['style']['color'] ?? '#3b82f6',
            ];
        });
        $this->dispatch('initialLayersData', [
            'layers' => $layersData,
            'visibleLayers' => $this->visibleLayers,
            'selectedLayerId' => $this->selectedLayer?->id,
        ]);
    }

    public function toggleLayerVisibility($layerId)
    {
        if ($this->selectedLayer && $this->selectedLayer->id == $layerId) {
            session()->flash('info', 'No puedes ocultar la capa que estás editando.');
            return;
        }
        if (in_array($layerId, $this->visibleLayers)) {
            $this->visibleLayers = array_diff($this->visibleLayers, [$layerId]);
        } else {
            $this->visibleLayers[] = $layerId;
        }
        $this->dispatch('visibilityChanged', $this->visibleLayers);
    }

    public function selectLayer($layerId)
    {
        $this->selectedLayer = Layer::find($layerId);
        if (!$this->selectedLayer) return;
        // Asegurar que la capa seleccionada está visible
        if (!in_array($layerId, $this->visibleLayers)) {
            $this->visibleLayers[] = $layerId;
            $this->dispatch('visibilityChanged', $this->visibleLayers);
        }
        $geojson = $this->selectedLayer->geojson_data;
        $this->dispatch('layerSelectedForEdit', [
            'layerId' => $layerId,
            'geojson' => $geojson,
            'color' => $geojson['style']['color'] ?? '#3b82f6',
        ]);
        session()->flash('info', 'Editando capa: ' . $this->selectedLayer->name);
    }

    public function importFile()
    {
        $this->validate();
        $user = Auth::user();
        if (!$user->can('upload layers') && !$user->hasRole('Admin')) {
            session()->flash('error', 'Sin permisos.');
            return;
        }

        $projectDir = "uploads/projects/{$this->project->id}/layers";
        $originalPath = $this->uploadFile->store($projectDir, 'public');
        $geojson = SpatialFileConverter::convertToGeoJson($this->uploadFile);
        if (!$geojson) {
            session()->flash('error', 'Conversión fallida.');
            return;
        }
        $geojson['style'] = ['color' => $this->layerColor ?: '#3b82f6'];

        $layer = Layer::create([
            'project_id' => $this->project->id,
            'phase_id' => $this->phase->id,
            'name' => $this->layerName,
            'geojson_data' => $geojson,
            'original_file' => $originalPath,
            'uploaded_by' => $user->id,
        ]);

        $this->loadLayers();
        $this->visibleLayers[] = $layer->id;
        $this->reset(['uploadFile', 'layerName']);
        $this->emitInitialLayersData();
        session()->flash('message', 'Capa importada.');
    }

    public function createEmptyLayer()
    {
        $user = Auth::user();
        $emptyGeojson = [
            'type' => 'FeatureCollection',
            'features' => [],
            'style' => ['color' => $this->layerColor ?: '#3b82f6']
        ];
        $layer = Layer::create([
            'project_id' => $this->project->id,
            'phase_id' => $this->phase->id,
            'name' => $this->layerName ?: 'Nueva capa',
            'geojson_data' => $emptyGeojson,
            'original_file' => null,
            'uploaded_by' => $user->id,
        ]);
        $this->loadLayers();
        $this->visibleLayers[] = $layer->id;
        $this->selectLayer($layer->id);
        $this->emitInitialLayersData();
        session()->flash('message', 'Capa vacía creada y seleccionada.');
    }

    public function saveManualGeojson($geojsonString)
    {
        if (!$this->selectedLayer) {
            session()->flash('error', 'No hay capa seleccionada.');
            return;
        }
        $geojson = json_decode($geojsonString, true);
        if (json_last_error() !== JSON_ERROR_NONE) {
            session()->flash('error', 'GeoJSON inválido.');
            return;
        }
        $geojson['style'] = ['color' => $this->layerColor ?: ($this->selectedLayer->geojson_data['style']['color'] ?? '#3b82f6')];
        $this->selectedLayer->geojson_data = $geojson;
        $this->selectedLayer->save();

        $this->loadLayers(); // recargar por si acaso
        $this->selectLayer($this->selectedLayer->id);
        $this->emitInitialLayersData();
        session()->flash('message', 'Capa guardada.');
    }

    public function deleteLayer($layerId)
    {
        $user = Auth::user();
        if (!$user->can('delete layers') && !$user->hasRole('Admin')) abort(403);
        $layer = Layer::find($layerId);
        if (!$layer) return;
        if ($layer->original_file) Storage::disk('public')->delete($layer->original_file);
        $layer->delete();
        $this->loadLayers();
        if ($this->selectedLayer && $this->selectedLayer->id == $layerId) {
            $this->selectedLayer = null;
        }
        $this->emitInitialLayersData();
        session()->flash('message', 'Capa eliminada.');
    }

    public function cancelEditing()
    {
        $this->selectedLayer = null;
        $this->dispatch('layerSelectedForEdit', null);
    }

    public function render()
    {
        return view('livewire.layer-manager');
    }
}