<?php

namespace App\Services;

use App\Models\ImportLog;
use App\Models\Prize;

class PrizeImportService
{
    /**
     * Import baris hadiah. Jika kuantiti > 1, generate beberapa item berasingan
     * (cth Hamper #1 .. Hamper #5).
     *
     * @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 = [];

        // Jejak susunan_cabutan yang telah dikosongkan (overwrite) dalam import ini,
        // supaya item yang baru dimasukkan tidak dipadam semula oleh baris seterusnya.
        $cleared = [];

        foreach ($rows as $i => $row) {
            $line = $i + 2;

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

            $kuantiti = max(1, (int) ($row['kuantiti'] ?? 1));
            $drawOrder = (int) ($row['susunan_cabutan'] ?? ($row['draw_order'] ?? 0));
            $kodHadiah = trim($row['kod_hadiah'] ?? '');
            $batch = $kodHadiah !== '' ? $kodHadiah : 'B' . str_pad((string) ($i + 1), 4, '0', STR_PAD_LEFT);

            // Overwrite data lama jika susunan_cabutan adalah nombor yang sama.
            if ($drawOrder > 0 && ! isset($cleared[$drawOrder])) {
                $existing = Prize::where('draw_order', $drawOrder)->get();

                if ($existing->contains(fn (Prize $p) => $p->status === Prize::STATUS_DISAHKAN)) {
                    $failed++;
                    $errors[] = "Baris {$line}: susunan_cabutan {$drawOrder} sudah ada pemenang disahkan, tidak boleh ditulis ganti.";
                    continue;
                }

                $duplicate += $existing->count();
                Prize::where('draw_order', $drawOrder)->delete();
                $cleared[$drawOrder] = true;
            }

            try {
                foreach ($this->expand($nama, $kuantiti) as $index => $itemName) {
                    Prize::create([
                        'kod_hadiah' => $kodHadiah ?: null,
                        'nama_hadiah' => $itemName,
                        'kategori' => trim($row['kategori'] ?? '') ?: null,
                        'nilai_anggaran' => $this->parseDecimal($row['nilai_anggaran'] ?? ''),
                        'draw_order' => $drawOrder,
                        'item_index' => $index,
                        'batch_kod' => $batch,
                        'status' => Prize::STATUS_BELUM,
                    ]);
                    $success++;
                }
            } catch (\Throwable $e) {
                $failed++;
                $errors[] = "Baris {$line}: {$e->getMessage()}";
            }
        }

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

    /**
     * @return array<int, string>  diindeks dari 1
     */
    public function expand(string $nama, int $kuantiti): array
    {
        if ($kuantiti <= 1) {
            return [1 => $nama];
        }

        $items = [];
        for ($n = 1; $n <= $kuantiti; $n++) {
            $items[$n] = "{$nama} #{$n}";
        }

        return $items;
    }

    private function parseDecimal(string $value): ?float
    {
        $value = trim(str_replace([',', 'RM', 'rm'], '', $value));
        return $value === '' ? null : (float) $value;
    }
}