<?php

namespace App\Services;

use App\Models\ImportLog;
use App\Models\Member;

class MemberImportService
{
    /**
     * Import baris anggota. Tidak crash bila ada duplicate/ralat —
     * pulangkan ringkasan + simpan ImportLog.
     *
     * @param  array<int, array<string, string>>  $rows
     */
    public function import(array $rows, string $filename, ?int $userId = null): ImportLog
    {
        $success = 0;
        $duplicate = 0;
        $failed = 0;
        $errors = [];

        // Set pra-muat untuk kesan duplicate dalam fail itu sendiri
        $seenKp = [];
        $seenPekerja = [];

        foreach ($rows as $i => $row) {
            $line = $i + 2; // baris fail (header = 1)

            $nama = trim($row['nama'] ?? '');
            $noKp = $this->clean($row['no_kp'] ?? '');
            $noPekerja = $this->clean($row['no_pekerja'] ?? '');
            $noAnggota = $this->clean($row['no_anggota'] ?? '');

            if ($nama === '') {
                $failed++;
                $errors[] = "Baris {$line}: nama wajib diisi.";
                continue;
            }

            // Duplicate dalam fail
            if ($noKp && isset($seenKp[$noKp])) {
                $duplicate++;
                $errors[] = "Baris {$line}: no_kp '{$noKp}' duplicate dalam fail.";
                continue;
            }
            if ($noPekerja && isset($seenPekerja[$noPekerja])) {
                $duplicate++;
                $errors[] = "Baris {$line}: no_pekerja '{$noPekerja}' duplicate dalam fail.";
                continue;
            }

            // Duplicate dalam DB
            $exists = Member::query()
                ->when($noKp, fn ($q) => $q->orWhere('no_kp', $noKp))
                ->when($noPekerja, fn ($q) => $q->orWhere('no_pekerja', $noPekerja))
                ->when($noKp || $noPekerja, fn ($q) => $q, fn ($q) => $q->whereRaw('1 = 0'))
                ->exists();

            if ($exists) {
                $duplicate++;
                $errors[] = "Baris {$line}: anggota '{$nama}' sudah wujud (no_kp/no_pekerja sepadan).";
                continue;
            }

            try {
                Member::create([
                    'no_anggota' => $noAnggota ?: null,
                    'no_pekerja' => $noPekerja ?: null,
                    'no_kp' => $noKp ?: null,
                    'nama' => $nama,
                    'jabatan' => $this->clean($row['jabatan'] ?? '') ?: null,
                    'bahagian' => $this->clean($row['bahagian'] ?? '') ?: null,
                    'telefon' => $this->clean($row['telefon'] ?? '') ?: null,
                    'status_aktif' => $this->parseAktif($row['status_aktif'] ?? ''),
                ]);

                if ($noKp) {
                    $seenKp[$noKp] = true;
                }
                if ($noPekerja) {
                    $seenPekerja[$noPekerja] = true;
                }
                $success++;
            } catch (\Throwable $e) {
                $failed++;
                $errors[] = "Baris {$line}: {$e->getMessage()}";
            }
        }

        return ImportLog::create([
            'type' => 'members',
            'filename' => $filename,
            'total_rows' => count($rows),
            'success_count' => $success,
            'duplicate_count' => $duplicate,
            'failed_count' => $failed,
            'errors' => $errors ?: null,
            'imported_by' => $userId,
        ]);
    }

    private function clean(string $value): string
    {
        return trim($value);
    }

    private function parseAktif(string $value): bool
    {
        $value = strtolower(trim($value));
        if ($value === '') {
            return true; // default aktif
        }

        return in_array($value, ['1', 'aktif', 'active', 'ya', 'yes', 'true', 'y'], true);
    }
}