<?php

namespace App\Livewire\Inspections;

use App\Models\InspectionTemplate;
use Illuminate\Support\Facades\Auth;
use Livewire\Attributes\Layout;
use Livewire\Attributes\On;
use Livewire\Component;
use Livewire\WithFileUploads;
use PhpOffice\PhpSpreadsheet\IOFactory;

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

    public $templates;

    public $editingTemplate = null;
    public $showForm = false;
    public $form = [
        'name'        => '',
        'description' => '',
        'fields'      => [],
    ];

    // ── Importar desde CSV/Excel ───────────────────────────────────────────
    public $showImportFileModal  = false;
    public $importFile           = null;
    public $importPreviewFields  = [];
    public $importTemplateName   = '';
    public $importError          = '';

    public $fieldTypes = [
        'text'       => 'Texto corto',
        'textarea'   => 'Texto largo',
        'integer'    => 'Número entero',
        'decimal'    => 'Número decimal',
        'percentage' => 'Porcentaje (0-100)',
        'boolean'    => 'Sí/No (checkbox)',
        'date'       => 'Fecha',
        'select'     => 'Lista desplegable',
    ];

    public function mount()
    {
        abort_unless(Auth::user()->can('manage templates'), 403);
        $this->loadTemplates();
    }

    public function loadTemplates()
    {
        // Catálogo global: todas las plantillas.
        $this->templates = InspectionTemplate::orderBy('name')->get();
    }

    public function newTemplate()
    {
        $this->resetForm();
        $this->showForm = true;
    }

    #[On('template-edit')]
    public function editTemplate($id)
    {
        $template = InspectionTemplate::findOrFail($id);
        $this->form = [
            'name'        => $template->name,
            'description' => $template->description ?? '',
            'fields'      => $template->fields ?? [],
        ];
        $this->editingTemplate = $id;
        $this->showForm = true;
    }

    public function cancelForm()
    {
        $this->showForm = false;
        $this->resetForm();
    }

    public function resetForm()
    {
        $this->form = [
            'name'        => '',
            'description' => '',
            'fields'      => [],
        ];
        $this->editingTemplate = null;
    }

    public function addField()
    {
        $this->form['fields'][] = [
            'group'    => '',
            'name'     => '',
            'label'    => '',
            'question' => '',
            'type'     => 'text',
            'options'  => '',
            'required' => false,
            'min'      => null,
            'max'      => null,
            'step'     => null,
            'help'     => '',
        ];
    }

    public function removeField($index)
    {
        unset($this->form['fields'][$index]);
        $this->form['fields'] = array_values($this->form['fields']);
    }

    public function saveTemplate()
    {
        $this->validate([
            'form.name'   => 'required|string|max:255',
            'form.fields' => 'array',
        ]);

        $data = [
            'name'        => $this->form['name'],
            'description' => $this->form['description'],
            'project_id'  => null,
            'fields'      => array_values($this->form['fields']),
        ];

        if ($this->editingTemplate) {
            InspectionTemplate::findOrFail($this->editingTemplate)->update($data);
            $this->dispatch('notify', 'Plantilla actualizada');
        } else {
            InspectionTemplate::create($data);
            $this->dispatch('notify', 'Plantilla creada');
        }

        $this->cancelForm();
        $this->loadTemplates();
        $this->dispatch('templates-changed');
    }

    #[On('template-delete')]
    public function deleteTemplate($id)
    {
        InspectionTemplate::findOrFail($id)->delete();
        $this->loadTemplates();
        $this->dispatch('templates-changed');
        $this->dispatch('notify', 'Plantilla eliminada');
    }

    // ── Importar desde CSV/Excel ───────────────────────────────────────────

    public function openImportFileModal()
    {
        $this->importFile          = null;
        $this->importPreviewFields = [];
        $this->importTemplateName  = '';
        $this->importError         = '';
        $this->showImportFileModal = true;
    }

    public function downloadExampleCsv()
    {
        $headers = ['Content-Type' => 'text/csv'];
        $csv = "name,label,type,required,options,min,max,step\n"
             . "altura,Altura (m),decimal,1,,0,100,0.1\n"
             . "ok,¿OK?,boolean,1,,,,\n";
        return response()->streamDownload(fn () => print($csv), 'plantilla_ejemplo.csv', $headers);
    }

    public function parseImportFile()
    {
        $this->importError = '';
        $this->validate([
            'importFile'         => 'required|file|mimes:csv,txt,xlsx,xls|max:5120',
            'importTemplateName' => 'required|string|max:255',
        ]);

        try {
            $rows = $this->readFileRows();
        } catch (\Throwable $e) {
            $this->importError = 'No se pudo leer el archivo: ' . $e->getMessage();
            return;
        }

        $fields = $this->parseRows($rows);
        if (empty($fields)) {
            $this->importError = 'No se encontraron filas válidas.';
            return;
        }
        $this->importPreviewFields = $fields;
    }

    public function confirmImportFile()
    {
        if (empty($this->importPreviewFields) || empty($this->importTemplateName)) return;

        InspectionTemplate::create([
            'name'        => $this->importTemplateName,
            'description' => 'Importado desde archivo',
            'project_id'  => null,
            'fields'      => array_values($this->importPreviewFields),
        ]);

        $this->showImportFileModal = false;
        $this->importPreviewFields = [];
        $this->importTemplateName  = '';
        $this->importFile          = null;
        $this->loadTemplates();
        $this->dispatch('templates-changed');
        $this->dispatch('notify', 'Plantilla importada');
    }

    private function readFileRows(): array
    {
        $ext  = strtolower($this->importFile->getClientOriginalExtension());
        $path = $this->importFile->getRealPath();

        if ($ext === 'xlsx' || $ext === 'xls') {
            $spreadsheet = IOFactory::load($path);
            $sheet       = $spreadsheet->getActiveSheet();
            $rows        = $sheet->toArray(null, true, true, false);
            array_shift($rows);
            return array_filter($rows, fn ($r) => !empty($r[0]));
        }

        $rows   = [];
        $handle = fopen($path, 'r');
        $bom = fread($handle, 3);
        if ($bom !== "\xEF\xBB\xBF") rewind($handle);
        fgetcsv($handle);
        while (($row = fgetcsv($handle)) !== false) {
            if (!empty($row[0])) $rows[] = $row;
        }
        fclose($handle);
        return $rows;
    }

    private function parseRows(array $rows): array
    {
        $fields = [];
        foreach ($rows as $row) {
            $row     = array_values((array) $row);
            $rawName = trim($row[0] ?? '');
            if ($rawName === '') continue;

            $fields[] = [
                'name'     => $this->slugify($rawName),
                'label'    => trim($row[1] ?? $rawName),
                'type'     => $this->normalizeType($row[2] ?? 'text'),
                'required' => in_array(strtolower(trim($row[3] ?? '0')), ['1', 'si', 'sí', 'yes', 'true']),
                'options'  => trim($row[4] ?? ''),
                'min'      => ($row[5] ?? '') !== '' ? $row[5] : null,
                'max'      => ($row[6] ?? '') !== '' ? $row[6] : null,
                'step'     => ($row[7] ?? '') !== '' ? $row[7] : null,
            ];
        }
        return $fields;
    }

    private function slugify(string $str): string
    {
        $str = mb_strtolower(trim($str));
        $str = preg_replace('/\s+/', '_', $str);
        $str = preg_replace('/[^a-z0-9_]/i', '', $str);
        return trim($str, '_') ?: 'campo';
    }

    private function normalizeType(string $type): string
    {
        $map = [
            'texto' => 'text', 'text' => 'text', 'string' => 'text', 'corto' => 'text',
            'textarea' => 'textarea', 'largo' => 'textarea', 'parrafo' => 'textarea',
            'integer' => 'integer', 'entero' => 'integer', 'int' => 'integer', 'numero' => 'integer',
            'decimal' => 'decimal', 'float' => 'decimal', 'number' => 'decimal', 'numerico' => 'decimal',
            'percentage' => 'percentage', 'porcentaje' => 'percentage', 'pct' => 'percentage', '%' => 'percentage',
            'boolean' => 'boolean', 'bool' => 'boolean', 'checkbox' => 'boolean', 'sino' => 'boolean', 'si/no' => 'boolean',
            'date' => 'date', 'fecha' => 'date',
            'select' => 'select', 'lista' => 'select', 'dropdown' => 'select', 'opciones' => 'select',
        ];
        return $map[strtolower(trim($type))] ?? 'text';
    }

    public function render()
    {
        return view('livewire.inspections.global-template-manager');
    }
}