<?php

namespace App\Http\Controllers;

use App\Enums\FieldType;
use App\Models\Lieu;
use App\Models\Releve;
use App\Models\Source;
use App\Support\DbCompat;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class ImportController extends Controller
{
    public function create(Source $source): View
    {
        $this->authorize('create', [Releve::class, $source]);

        $source->load('sourceType.fields');

        return view('sources.import', compact('source'));
    }

    public function store(Request $request, Source $source): RedirectResponse
    {
        $this->authorize('create', [Releve::class, $source]);

        $request->validate([
            'fichier' => ['required', 'file', 'mimes:csv,txt', 'max:10240'],
        ]);

        $source->load('sourceType.fields');
        $fieldsByLabel = $source->sourceType->fields->keyBy('label');

        $path   = $request->file('fichier')->getRealPath();
        $handle = fopen($path, 'r');

        // Suppression du BOM UTF-8 éventuel
        $bom = fread($handle, 3);
        if ($bom !== "\xEF\xBB\xBF") {
            rewind($handle);
        }

        // Détection automatique du séparateur (; ou ,)
        $firstLine = fgets($handle);
        rewind($handle);
        if ($bom === "\xEF\xBB\xBF") {
            fread($handle, 3);
        }
        $sep = substr_count($firstLine, ';') >= substr_count($firstLine, ',') ? ';' : ',';

        $header = fgetcsv($handle, 0, $sep);
        if (! $header) {
            fclose($handle);
            return back()->with('error', 'Fichier CSV vide ou invalide.');
        }
        $header = array_map('trim', $header);

        $imported = 0;
        $userId   = auth()->id();

        while (($line = fgetcsv($handle, 0, $sep)) !== false) {
            if (count(array_filter($line, fn ($v) => $v !== '')) === 0) {
                continue;
            }

            $data = [];
            foreach ($header as $i => $label) {
                $field = $fieldsByLabel->get($label);
                if (! $field) {
                    continue;
                }
                $data[$field->name] = $this->parseValue(trim($line[$i] ?? ''), $field->type);
            }

            $source->releves()->create([
                'data'       => $data,
                'created_by' => $userId,
                'updated_by' => $userId,
            ]);
            $imported++;
        }

        fclose($handle);

        if ($imported === 0) {
            return back()->with('error', 'Aucun relevé importé — vérifiez que les en-têtes correspondent aux libellés des champs.');
        }

        return redirect()->route('sources.releves.index', $source)
            ->with('success', "{$imported} relevé(s) importé(s) avec succès.");
    }

    private function parseValue(string $raw, FieldType $type): mixed
    {
        return match ($type) {
            FieldType::Boolean => in_array(mb_strtolower($raw), ['oui', 'yes', '1', 'true'], true),
            FieldType::Number  => $raw !== '' ? (float) str_replace(',', '.', $raw) : null,
            FieldType::Date    => $this->parseDate($raw),
            FieldType::Place   => $this->parsePlace($raw),
            default            => $raw !== '' ? $raw : null,
        };
    }

    private function parseDate(string $raw): array
    {
        if ($raw === '') {
            return ['valeur' => null, 'calendrier' => 'gregorien'];
        }
        // Format export : "YYYY-MM-DD" ou "YYYY-MM-DD (calendrier)"
        if (preg_match('/^(.+?)\s*\((\w+)\)\s*$/', $raw, $m)) {
            return ['valeur' => trim($m[1]), 'calendrier' => trim($m[2])];
        }
        return ['valeur' => $raw, 'calendrier' => 'gregorien'];
    }

    private function parsePlace(string $raw): ?array
    {
        if ($raw === '') {
            return null;
        }
        $like = DbCompat::like();
        $lieu = Lieu::where('nom_long', $raw)->first(['id', 'nom_long'])
            ?? Lieu::where('nom_long', $like, $raw . '%')->first(['id', 'nom_long']);

        return $lieu
            ? ['id' => $lieu->id, 'nom_long' => $lieu->nom_long]
            : ['id' => null, 'nom_long' => $raw];
    }
}