<?php

namespace App\Services\Import;

use App\Enums\CompanyType;
use App\Enums\Portal;
use App\Models\Company;
use App\Models\LegacyImportMap;
use App\Models\User;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class CompanyImporter
{
    private const CHUNK_SIZE = 500;

    private const CTYPE_MAP = [
        'agency' => CompanyType::Agency,
        'company' => CompanyType::Company,
    ];

    public function run(ImportContext $ctx): ImportResult
    {
        $result = new ImportResult;
        $conn = $ctx->connection;
        $legacyPortal = $ctx->legacyPortalValue();
        $portal = $ctx->portalEnum;

        // Verantwortliche User voraufladen (responsible_company_user)
        $responsibles = DB::connection($conn)
            ->table('responsible_company_user')
            ->get()
            ->groupBy('company_id')
            ->map(fn ($rows) => $rows->pluck('user_id')->all());

        // Einfache company_user Mitglieder
        $members = DB::connection($conn)
            ->table('company_user')
            ->get()
            ->groupBy('company_id')
            ->map(fn ($rows) => $rows->pluck('user_id')->all());

        DB::connection($conn)
            ->table('company')
            ->orderBy('id')
            ->chunk(self::CHUNK_SIZE, function ($rows) use ($ctx, $result, $legacyPortal, $portal, $responsibles, $members): void {
                foreach ($rows as $row) {
                    try {
                        $this->importRow($row, $ctx, $result, $legacyPortal, $portal, $responsibles, $members);
                    } catch (\Throwable $e) {
                        $result->addError("Company legacy_id={$row->id}: {$e->getMessage()}");
                    }
                }
            });

        return $result;
    }

    private function importRow(
        object $row,
        ImportContext $ctx,
        ImportResult $result,
        string $legacyPortal,
        Portal $portal,
        Collection $responsibles,
        Collection $members,
    ): void {
        $alreadyImported = LegacyImportMap::query()
            ->where('legacy_portal', $legacyPortal)
            ->where('legacy_table', 'company')
            ->where('legacy_id', $row->id)
            ->exists();

        if ($alreadyImported && ! $ctx->force) {
            $result->incrementSkipped();

            return;
        }

        if ($ctx->dryRun) {
            $result->incrementImported();

            return;
        }

        // Owner-User aus Import-Map auflösen
        $ownerUserId = null;
        if ($row->user_id) {
            $map = LegacyImportMap::query()
                ->where('legacy_portal', $legacyPortal)
                ->where('legacy_table', 'sf_guard_user')
                ->where('legacy_id', $row->user_id)
                ->first();
            $ownerUserId = $map?->target_id;
        }

        $type = self::CTYPE_MAP[$row->ctype] ?? CompanyType::Company;

        // Eindeutigen Slug sicherstellen
        $slug = $this->uniqueSlug($row->slug ?: Str::slug($row->name) ?: 'firma', $portal->value);

        $company = Company::withoutTimestamps(function () use ($legacyPortal, $row, $portal, $ownerUserId, $type, $slug): Company {
            return Company::withoutGlobalScopes()->updateOrCreate(
                ['legacy_portal' => $legacyPortal, 'legacy_id' => $row->id],
                [
                    'portal' => $portal->value,
                    'owner_user_id' => $ownerUserId,
                    'type' => $type->value,
                    'name' => $row->name ?: 'Unbekannte Firma',
                    'slug' => $slug,
                    'address' => $row->address ?: null,
                    'phone' => $this->cleanText($row->phone, 255),
                    'fax' => $this->cleanText($row->fax, 255),
                    'email' => $this->cleanText($row->email, 190),
                    'website' => $this->cleanText($row->website, 190),
                    'logo_path' => $row->logo ?: null,
                    'is_active' => (bool) $row->is_active,
                    'disable_footer_code' => (bool) ($row->disable_footer_code ?? false),
                    'created_at' => $row->created_at ?? now(),
                    'updated_at' => $row->updated_at ?? $row->created_at ?? now(),
                ]
            );
        });

        // Pivot-Zuordnungen (member + responsible)
        $pivotPayload = [];

        foreach ($members->get($row->id, []) as $legacyUserId) {
            $userMap = LegacyImportMap::query()
                ->where('legacy_portal', $legacyPortal)
                ->where('legacy_table', 'sf_guard_user')
                ->where('legacy_id', $legacyUserId)
                ->first();

            if ($userMap) {
                $role = in_array($legacyUserId, $responsibles->get($row->id, []))
                    ? 'responsible'
                    : 'member';
                $pivotPayload[$userMap->target_id] = ['role' => $role];
            }
        }

        if ($pivotPayload !== []) {
            $company->users()->syncWithoutDetaching($pivotPayload);
        }

        LegacyImportMap::query()->updateOrCreate(
            [
                'legacy_portal' => $legacyPortal,
                'legacy_table' => 'company',
                'legacy_id' => $row->id,
            ],
            [
                'target_table' => 'companies',
                'target_id' => $company->id,
                'imported_at' => now(),
            ]
        );

        if ($alreadyImported) {
            $result->incrementUpdated();
        } else {
            $result->incrementImported();
        }
    }

    private function uniqueSlug(string $base, string $portal): string
    {
        $slug = $base;
        $i = 2;

        while (Company::withoutGlobalScopes()
            ->where('portal', $portal)
            ->where('slug', $slug)
            ->exists()
        ) {
            $slug = $base.'-'.$i++;
        }

        return $slug;
    }

    /** Bereinigt HTML-Entities und kürzt auf maximale Feldlänge. */
    private function cleanText(?string $value, int $maxLength): ?string
    {
        if (blank($value)) {
            return null;
        }

        // HTML-Entities dekodieren (z.B. &#8201; → Thin Space → entfernen)
        $clean = html_entity_decode((string) $value, ENT_QUOTES | ENT_HTML5, 'UTF-8');
        // Steuerzeichen und unsichtbare Unicode-Zeichen entfernen
        $clean = preg_replace('/[\x00-\x1F\x7F\xC2\xA0]/u', ' ', $clean) ?? $clean;
        $clean = trim((string) $clean);

        if (blank($clean)) {
            return null;
        }

        return mb_substr($clean, 0, $maxLength);
    }
}