<?php

namespace App\Services;

use App\Models\Releve;
use App\Models\Source;
use Illuminate\Support\Collection;

class GedcomExportService
{
    // Mapping des noms de champs vers les tags GEDCOM
    private const FIELD_EVENT_MAP = [
        'naissance' => 'BIRT', 'birth'   => 'BIRT',
        'mariage'   => 'MARR', 'marriage' => 'MARR',
        'deces'     => 'DEAT', 'décès'   => 'DEAT', 'death' => 'DEAT',
    ];

    public function __construct(
        private readonly DateConversionService $dates,
    ) {}

    public function exportSource(Source $source): string
    {
        $source->load('sourceType.fields', 'releves.createur');
        return $this->buildGedcom($source->releves, $source->nom, $source->sourceType->nom);
    }

    public function exportReleves(Collection $releves, string $titre = 'Export'): string
    {
        return $this->buildGedcom($releves, $titre);
    }

    private function buildGedcom(Collection $releves, string $sourceName, string $sourceTypeName = ''): string
    {
        $lines   = [];
        $lines[] = $this->header($sourceName);

        $sourceTag = '@S1@';
        $famId     = 0;
        $indiId    = 0;

        // Détecter le type d'événement depuis le nom du type de source
        $eventType = $this->detectEventType($sourceTypeName ?: $sourceName);

        $individuals = [];
        $families    = [];

        foreach ($releves as $releve) {
            $data = $releve->data ?? [];

            $indiId++;
            $indiTag = "@I{$indiId}@";

            $nom    = $data['nom']    ?? '';
            $prenom = $data['prenom'] ?? $data['prenom_epoux'] ?? $data['prenom_epouse'] ?? '';

            // ── Individu principal ──────────────────────────────────────────
            $indi = [];
            $indi[] = "0 {$indiTag} INDI";
            if ($nom || $prenom) {
                $indi[] = "1 NAME {$prenom} /{$nom}/";
                if ($prenom) $indi[] = "1 GIVN {$prenom}";
                if ($nom)    $indi[] = "1 SURN {$nom}";
            }

            // Événement principal
            $dateField = $data['date_evenement'] ?? $data['date_naissance'] ?? $data['date_mariage'] ?? null;
            $gedDate   = is_array($dateField) ? $this->dates->toGedcomDate($dateField) : null;
            $lieu      = $data['lieu_naissance'] ?? $data['lieu_evenement'] ?? $data['lieu_mariage'] ?? null;

            $indi[] = "1 {$eventType}";
            if ($gedDate) $indi[] = "2 DATE {$gedDate}";
            if ($lieu)    $indi[] = "2 PLAC {$lieu}";

            // Référence à la source
            $indi[] = "1 SOUR {$sourceTag}";
            if (isset($data['numero_acte'])) {
                $indi[] = "2 PAGE Acte n°{$data['numero_acte']}";
            }

            // Notes (champs non mappés)
            $noteFields = ['note', 'observation', 'remarque'];
            foreach ($noteFields as $nf) {
                if (!empty($data[$nf])) {
                    foreach ($this->wrapNote($data[$nf]) as $noteLine) {
                        $indi[] = $noteLine;
                    }
                }
            }

            $individuals[] = implode("\n", $indi);

            // ── Famille (père/mère ou époux/épouse) ─────────────────────────
            $hasFather = !empty($data['nom_pere']) || !empty($data['prenom_pere']);
            $hasMother = !empty($data['nom_mere']) || !empty($data['prenom_mere']);
            $isMarriage = $eventType === 'MARR';

            if ($hasFather || $hasMother || $isMarriage) {
                $famId++;
                $famTag = "@F{$famId}@";

                $fam = [];
                $fam[] = "0 {$famTag} FAM";

                if ($isMarriage) {
                    // Pour un mariage, créer époux et épouse séparément
                    if (!empty($data['nom_epoux']) || !empty($data['prenom_epoux'])) {
                        $indiId++;
                        $epouxTag = "@I{$indiId}@";
                        $individuals[] = implode("\n", [
                            "0 {$epouxTag} INDI",
                            "1 NAME {$data['prenom_epoux']} /{$data['nom_epoux']}/",
                            "1 FAMS {$famTag}",
                            "1 SOUR {$sourceTag}",
                        ]);
                        $fam[] = "1 HUSB {$epouxTag}";
                    }
                    if (!empty($data['nom_epouse']) || !empty($data['prenom_epouse'])) {
                        $indiId++;
                        $epouseTag = "@I{$indiId}@";
                        $individuals[] = implode("\n", [
                            "0 {$epouseTag} INDI",
                            "1 NAME {$data['prenom_epouse']} /{$data['nom_epouse']}/",
                            "1 FAMS {$famTag}",
                            "1 SOUR {$sourceTag}",
                        ]);
                        $fam[] = "1 WIFE {$epouseTag}";
                    }
                    $fam[] = "1 MARR";
                    if ($gedDate) $fam[] = "2 DATE {$gedDate}";
                    if ($lieu)    $fam[] = "2 PLAC {$lieu}";
                    // Lier l'individu principal comme enfant si besoin
                } else {
                    // Naissance/décès : père et mère
                    if ($hasFather) {
                        $indiId++;
                        $pereTag = "@I{$indiId}@";
                        $individuals[] = implode("\n", [
                            "0 {$pereTag} INDI",
                            "1 NAME " . ($data['prenom_pere'] ?? '') . " /" . ($data['nom_pere'] ?? '') . "/",
                            "1 FAMS {$famTag}",
                            "1 SOUR {$sourceTag}",
                        ]);
                        $fam[] = "1 HUSB {$pereTag}";
                    }
                    if ($hasMother) {
                        $indiId++;
                        $mereTag = "@I{$indiId}@";
                        $individuals[] = implode("\n", [
                            "0 {$mereTag} INDI",
                            "1 NAME " . ($data['prenom_mere'] ?? '') . " /" . ($data['nom_mere'] ?? '') . "/",
                            "1 FAMS {$famTag}",
                            "1 SOUR {$sourceTag}",
                        ]);
                        $fam[] = "1 WIFE {$mereTag}";
                    }
                    $fam[] = "1 CHIL {$indiTag}";
                    // Lier l'enfant à sa famille
                    $indi[] = "1 FAMC {$famTag}";
                }

                $families[] = implode("\n", $fam);
            }
        }

        foreach ($individuals as $indi) {
            $lines[] = $indi;
        }
        foreach ($families as $fam) {
            $lines[] = $fam;
        }

        // Enregistrement SOURCE
        $lines[] = implode("\n", [
            "0 {$sourceTag} SOUR",
            "1 TITL {$sourceName}",
            "1 AUTH MesRelevés",
        ]);

        $lines[] = "0 TRLR";

        return implode("\n", $lines) . "\n";
    }

    private function header(string $sourceName): string
    {
        $date = now()->format('d M Y');
        $time = now()->format('H:i:s');

        return implode("\n", [
            '0 HEAD',
            '1 SOUR MESRELEVES',
            '2 NAME MesRelevés',
            '2 VERS 1.0',
            '1 DEST ANY',
            "1 DATE {$date}",
            "2 TIME {$time}",
            '1 GEDC',
            '2 VERS 5.5.1',
            '2 FORM LINEAGE-LINKED',
            '1 CHAR UTF-8',
            "1 FILE {$sourceName}.ged",
            '1 LANG French',
        ]);
    }

    private function detectEventType(string $name): string
    {
        $lower = mb_strtolower($name);
        foreach (self::FIELD_EVENT_MAP as $keyword => $tag) {
            if (str_contains($lower, $keyword)) {
                return $tag;
            }
        }
        return 'EVEN';
    }

    /** Découpe une note longue en lignes GEDCOM (max 248 chars par ligne) */
    private function wrapNote(string $text): array
    {
        $lines  = [];
        $chunks = mb_str_split($text, 248);
        foreach ($chunks as $i => $chunk) {
            $lines[] = ($i === 0 ? '1 NOTE ' : '2 CONT ') . $chunk;
        }
        return $lines;
    }
}