<?php

declare(strict_types=1);

namespace app\common\service\pharmacy;

use InvalidArgumentException;

final class EjMedicineBootstrapItem
{
    /** @param array<string,mixed> $row @return array<string,mixed> */
    public static function fromRow(array $row): array
    {
        $sourceId = self::sourceId($row['id'] ?? null);
        $name = self::text($row['name'] ?? null, '药材名称', 120);
        $unit = self::text($row['unit'] ?? null, '药材单位', 24);
        $status = $row['status'] ?? null;
        if (!in_array($status, [0, 1, '0', '1'], true)) {
            throw new InvalidArgumentException("本地药材 {$sourceId} 状态必须为 0 或 1");
        }

        return [
            'source_medicine_id' => $sourceId,
            'name' => $name,
            'brand' => '',
            'unit' => $unit,
            'settlement_price' => self::roundPrice($row['settlement_price'] ?? null),
            'retail_price' => self::roundPrice($row['retail_price'] ?? null),
            'status' => (int) $status,
        ];
    }

    /** @param array<int,array<string,mixed>> $rows @return list<array<string,mixed>> */
    public static function fromRows(array $rows): array
    {
        $items = array_map([self::class, 'fromRow'], $rows);
        usort($items, static fn (array $left, array $right): int => self::compareIds(
            (string) $left['source_medicine_id'],
            (string) $right['source_medicine_id']
        ));

        $previousId = null;
        foreach ($items as $item) {
            $sourceId = (string) $item['source_medicine_id'];
            if ($previousId !== null && hash_equals($previousId, $sourceId)) {
                throw new InvalidArgumentException("本地药材 source_medicine_id 重复：{$sourceId}");
            }
            $previousId = $sourceId;
        }
        return $items;
    }

    public static function roundPrice(mixed $value): string
    {
        if (!is_string($value) || preg_match('/^(0|[1-9]\d*)\.(\d{1,6})$/D', $value, $matches) !== 1) {
            throw new InvalidArgumentException('药材价格必须是最多六位小数的非负十进制字符串');
        }
        $whole = ltrim($matches[1], '0');
        $whole = $whole === '' ? '0' : $whole;
        $fraction = str_pad($matches[2], 6, '0');
        $fourDecimals = substr($fraction, 0, 4);
        if ((int) $fraction[4] < 5) {
            return $whole . '.' . $fourDecimals;
        }

        $digits = self::addOne($whole . $fourDecimals);
        if (strlen($digits) < 5) {
            $digits = str_pad($digits, 5, '0', STR_PAD_LEFT);
        }
        return substr($digits, 0, -4) . '.' . substr($digits, -4);
    }

    public static function compareIds(string $left, string $right): int
    {
        return strlen($left) <=> strlen($right) ?: strcmp($left, $right);
    }

    private static function sourceId(mixed $value): string
    {
        if (is_int($value)) {
            $value = (string) $value;
        }
        if (!is_string($value) || preg_match('/^\d+$/D', $value) !== 1) {
            throw new InvalidArgumentException('本地药材 id 必须是正整数');
        }
        $value = ltrim($value, '0');
        if ($value === '') {
            throw new InvalidArgumentException('本地药材 id 必须是正整数');
        }
        return $value;
    }

    private static function text(mixed $value, string $field, int $maxLength): string
    {
        if (!is_string($value)) {
            throw new InvalidArgumentException("{$field}必须是字符串");
        }
        $trimmed = preg_replace('/\A[\s\p{Z}\p{Cf}]+|[\s\p{Z}\p{Cf}]+\z/u', '', $value);
        if (!is_string($trimmed) || $trimmed === '' || mb_strlen($trimmed) > $maxLength) {
            throw new InvalidArgumentException("{$field}不能为空且不能超过 {$maxLength} 个字符");
        }
        return $trimmed;
    }

    private static function addOne(string $digits): string
    {
        $characters = str_split($digits);
        for ($index = count($characters) - 1; $index >= 0; --$index) {
            if ($characters[$index] !== '9') {
                $characters[$index] = (string) ((int) $characters[$index] + 1);
                return implode('', $characters);
            }
            $characters[$index] = '0';
        }
        return '1' . implode('', $characters);
    }
}