<?php

namespace App\Http\Controllers;

use App\Enums\FieldType;
use App\Enums\SourceStatus;
use App\Models\Releve;
use App\Models\Source;
use App\Services\GedcomExportService;
use App\Support\DbCompat;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\DB;

class ExportController extends Controller
{
    public function __construct(
        private readonly GedcomExportService $gedcom,
    ) {}

    /** Export CSV de tous les relevés d'une source */
    public function sourceCsv(Source $source): Response
    {
        $this->authorize('view', $source);

        $source->load(['sourceType.fields', 'releves']);
        $fields = $source->sourceType->fields->sortBy('order');

        $handle = fopen('php://temp', 'r+');

        // BOM UTF-8 pour la compatibilité Excel
        fwrite($handle, "\xEF\xBB\xBF");

        // En-tête
        fputcsv($handle, $fields->pluck('label')->toArray(), ';');

        // Lignes
        foreach ($source->releves as $releve) {
            $row = [];
            foreach ($fields as $field) {
                $val    = $releve->data[$field->name] ?? null;
                $row[]  = $this->formatCsvValue($val, $field->type);
            }
            fputcsv($handle, $row, ';');
        }

        rewind($handle);
        $csv = stream_get_contents($handle);
        fclose($handle);

        $filename = $this->sanitizeFilename($source->nom) . '.csv';

        return response($csv, 200, [
            'Content-Type'        => 'text/csv; charset=UTF-8',
            'Content-Disposition' => "attachment; filename=\"{$filename}\"",
        ]);
    }

    /** Export de tous les relevés d'une source */
    public function source(Source $source): Response
    {
        $this->authorize('view', $source);

        $gedcomContent = $this->gedcom->exportSource($source);
        $filename = $this->sanitizeFilename($source->nom) . '.ged';

        return response($gedcomContent, 200, [
            'Content-Type'        => 'text/plain; charset=UTF-8',
            'Content-Disposition' => "attachment; filename=\"{$filename}\"",
        ]);
    }

    /** Export depuis les résultats de recherche (avec les mêmes filtres) */
    public function recherche(Request $request): Response
    {
        $user = auth()->user();

        $query = Releve::with(['source.sourceType', 'createur'])
            ->whereHas('source', function ($q) use ($user, $request) {
                if (! $user->isSectionManager()) {
                    $assignedIds = $user->sourcesAssignees()->pluck('sources.id');
                    $q->where(function ($sq) use ($assignedIds) {
                        $sq->where('status', SourceStatus::Termine)
                           ->orWhereIn('id', $assignedIds);
                    });
                }
                if ($request->filled('source_type_id')) {
                    $q->where('source_type_id', $request->integer('source_type_id'));
                }
            }); // $request déjà dans le use()

        if ($request->filled('q')) {
            $q    = trim($request->get('q'));
            $like = DbCompat::like();
            $fts  = DbCompat::ftsRaw();

            $query->where(function ($wq) use ($q, $like, $fts) {
                $wq->where('nom',             $like, "%{$q}%")
                   ->orWhere('prenom',         $like, "%{$q}%")
                   ->orWhere('date_evenement', $like, "%{$q}%");
                if ($fts) {
                    $wq->orWhereRaw($fts, [$q]);
                }
            });
        }

        if ($request->filled('lieu_id')) {
            $rows = DB::select("
                WITH RECURSIVE descendants AS (
                    SELECT id, nom FROM lieux WHERE id = ?
                    UNION ALL
                    SELECT l.id, l.nom FROM lieux l
                    INNER JOIN descendants d ON l.lieu_parent_id = d.id
                )
                SELECT DISTINCT nom FROM descendants WHERE nom IS NOT NULL
            ", [$request->integer('lieu_id')]);

            $noms = collect($rows)->pluck('nom')->filter();
            if ($noms->isNotEmpty()) {
                $pattern = $noms->map(fn ($n) => preg_quote($n, '/'))->join('|');
                $query->whereRaw(DbCompat::jsonRegexRaw('data'), [$pattern]);
            }
        }

        if ($request->filled('annee_debut')) {
            $query->whereRaw('date_evenement >= ?', [$request->integer('annee_debut') . '-01-01']);
        }
        if ($request->filled('annee_fin')) {
            $query->whereRaw('date_evenement <= ?', [$request->integer('annee_fin') . '-12-31']);
        }

        $releves = $query->orderByRaw(DbCompat::nullsLast('nom'))->get();

        if ($releves->isEmpty()) {
            return back()->with('error', 'Aucun relevé à exporter.');
        }

        $titre = $request->filled('q') ? 'Recherche_' . $request->get('q') : 'Export';
        $gedcomContent = $this->gedcom->exportReleves($releves, $titre);
        $filename = $this->sanitizeFilename($titre) . '.ged';

        return response($gedcomContent, 200, [
            'Content-Type'        => 'text/plain; charset=UTF-8',
            'Content-Disposition' => "attachment; filename=\"{$filename}\"",
        ]);
    }

    private function formatCsvValue(mixed $val, FieldType $type): string
    {
        if ($val === null || $val === '') {
            return '';
        }

        return match ($type) {
            FieldType::Boolean => $val ? 'Oui' : 'Non',
            FieldType::Date    => is_array($val)
                ? trim(($val['valeur'] ?? '') . (
                    ! empty($val['calendrier']) && $val['calendrier'] !== 'gregorien'
                        ? ' (' . $val['calendrier'] . ')'
                        : ''
                ))
                : (string) $val,
            FieldType::Place   => is_array($val) ? ($val['nom_long'] ?? '') : (string) $val,
            default            => (string) $val,
        };
    }

    private function sanitizeFilename(string $name): string
    {
        $name = iconv('UTF-8', 'ASCII//TRANSLIT', $name) ?: $name;
        return preg_replace('/[^a-zA-Z0-9_-]/', '_', $name);
    }
}