<?php

namespace App\Business;

use App\Models\Business\InventoryWarehouseNameMapping;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;
use PhpOffice\PhpSpreadsheet\IOFactory;

class InventoryWarehouseNameMappingWorkbookImporter
{
    private const HEADERS = ['仓储方', '仓库', '仓库简称'];

    /** @return array{rows:list<array>,sheet:string,headers:list<string>,summary:array} */
    public function preview(UploadedFile $file): array
    {
        $spreadsheet = IOFactory::load($file->getRealPath());
        $worksheet = $this->findWorksheet($spreadsheet);

        if ($worksheet === null) {
            throw ValidationException::withMessages([
                'import' => '未找到包含“仓储方、仓库、仓库简称”三列的工作表。Sheet2 仅是辅助仓库清单，不能直接导入。',
            ]);
        }

        $rows = $worksheet->toArray(null, true, false, false);
        $parsed = [];
        $seen = [];
        $created = 0;
        $same = 0;
        $conflicts = 0;
        $invalid = 0;

        foreach (array_slice($rows, 1) as $offset => $row) {
            $rowNumber = $offset + 2;
            $provider = trim((string) ($row[0] ?? ''));
            $warehouse = trim((string) ($row[1] ?? ''));
            $shortName = trim((string) ($row[2] ?? ''));
            if ($provider === '' && $warehouse === '' && $shortName === '') {
                continue;
            }

            $key = $this->key($provider, $warehouse);
            $item = [
                'row_number' => $rowNumber,
                'warehouse_provider' => $provider,
                'warehouse' => $warehouse,
                'warehouse_short_name' => $shortName,
                'status' => 'new',
                'message' => '待新增',
            ];

            if ($provider === '' || $warehouse === '' || $shortName === '') {
                $item['status'] = 'invalid';
                $item['message'] = '仓储方、仓库、仓库简称均为必填字段';
                $invalid++;
            } elseif (isset($seen[$key])) {
                $item['status'] = $seen[$key]['warehouse_short_name'] === $shortName ? 'same' : 'conflict';
                $item['message'] = $item['status'] === 'same'
                    ? '与文件内前一行重复，将跳过'
                    : '与文件内前一行的仓库简称冲突';
                $item['status'] === 'same' ? $same++ : $conflicts++;
            } else {
                $existing = InventoryWarehouseNameMapping::query()
                    ->where('warehouse_provider', $provider)
                    ->where('warehouse', $warehouse)
                    ->first();

                if ($existing) {
                    $item['status'] = $existing->warehouse_short_name === $shortName ? 'same' : 'conflict';
                    $item['message'] = $item['status'] === 'same'
                        ? '数据库已有相同映射，将跳过'
                        : '数据库已有不同简称，禁止静默覆盖';
                    $item['status'] === 'same' ? $same++ : $conflicts++;
                } else {
                    $created++;
                }
            }

            $parsed[] = $item;
            if ($provider !== '' && $warehouse !== '' && $shortName !== '' && ! isset($seen[$key])) {
                $seen[$key] = $item;
            }
        }

        return [
            'rows' => $parsed,
            'sheet' => $worksheet->getTitle(),
            'headers' => self::HEADERS,
            'summary' => compact('created', 'same', 'conflicts', 'invalid'),
        ];
    }

    /** @param array{rows:list<array>} $preview */
    public function commit(array $preview): array
    {
        $rows = $preview['rows'] ?? [];
        $invalid = collect($rows)->first(fn (array $row): bool => in_array($row['status'] ?? '', ['invalid', 'conflict'], true));
        if ($invalid !== null) {
            throw ValidationException::withMessages([
                'import' => '导入预览存在必填字段错误或简称冲突，请先处理标记为失败的行。',
            ]);
        }

        $created = 0;
        $skipped = 0;
        DB::transaction(function () use ($rows, &$created, &$skipped): void {
            foreach ($rows as $row) {
                if (($row['status'] ?? '') === 'same') {
                    $skipped++;
                    continue;
                }

                $query = InventoryWarehouseNameMapping::query()
                    ->where('warehouse_provider', $row['warehouse_provider'])
                    ->where('warehouse', $row['warehouse']);
                if ($query->exists()) {
                    throw ValidationException::withMessages([
                        'import' => "第 {$row['row_number']} 行在确认时已被其他操作占用，请重新预览。",
                    ]);
                }

                InventoryWarehouseNameMapping::create([
                    'company_id' => company_id() ?: 1,
                    'warehouse_provider' => $row['warehouse_provider'],
                    'warehouse' => $row['warehouse'],
                    'warehouse_short_name' => $row['warehouse_short_name'],
                    'created_by' => auth()->id(),
                    'updated_by' => auth()->id(),
                ]);
                $created++;
            }
        });

        return compact('created', 'skipped');
    }

    public static function suggestion(string $provider, string $warehouse): string
    {
        $provider = trim($provider);
        $warehouse = trim($warehouse);
        $haystack = $provider . ' ' . $warehouse;

        if (str_starts_with($provider, '奇门-')) {
            return '不看';
        }

        foreach ([
            '配件单仓' => '配件单仓-不看',
            'POP仓' => '京东入仓-不看',
            '自动发货仓' => '虚拟仓-不看',
            '京东云仓' => '京东云仓-不看',
            '京东京造' => '京东京造-不看',
            '苏州福利品仓' => '苏州福利品仓-不看',
            '信誉订单仓' => '信誉订单仓-不看',
            '代发仓' => '代发仓',
            '销退仓' => '销退仓-不看',
            '客退' => '客退仓-不看',
            '次品仓' => '退货报废-不看',
            '数量校验仓' => '数量校验仓-不看',
        ] as $needle => $result) {
            if (str_contains($haystack, $needle)) {
                return $result;
            }
        }

        foreach ([
            '运营C崔桥工厂仓' => '崔桥工厂仓',
            '运营C横林二仓' => '横林二仓',
            '运营C睢宁' => '睢宁仓',
            '运营C新苏北' => '新苏北仓',
            '江西仓送货' => '南昌樵舍仓',
        ] as $needle => $result) {
            if (str_contains($haystack, $needle)) {
                return $result;
            }
        }

        $short = preg_replace('/(主仓|进货仓)$/u', '', $warehouse) ?: $warehouse;
        $short = preg_replace('/^(简尚-|京仓-|三方-|奇门-)/u', '', $short) ?: $short;
        $providerBase = preg_replace('/^(简尚-|京仓-|三方-|奇门-)/u', '', $provider) ?: $provider;
        if ($short === $providerBase || str_starts_with($short, $providerBase)) {
            $short = $providerBase;
        }

        return $short !== '' ? $short : $warehouse;
    }

    private function findWorksheet($spreadsheet): ?object
    {
        foreach ($spreadsheet->getWorksheetIterator() as $worksheet) {
            $row = $worksheet->toArray(null, true, false, false)[0] ?? [];
            $headers = array_map(fn ($value): string => $this->normalize((string) $value), $row);
            $expected = array_map(fn ($value): string => $this->normalize($value), self::HEADERS);
            if (count(array_intersect($expected, $headers)) === count($expected)) {
                return $worksheet;
            }
        }

        return null;
    }

    private function normalize(string $value): string
    {
        return mb_strtolower(preg_replace('/[\s\x{FEFF}_\-（）()]+/u', '', trim($value)));
    }

    private function key(string $provider, string $warehouse): string
    {
        return $provider . "\0" . $warehouse;
    }
}