<?php

declare(strict_types=1);

namespace app\common\service\pharmacy;

use RuntimeException;

final class EjMedicineCatalogSyncPolicy
{
    /** @return array{items:array<int,array<string,mixed>>,next_cursor:int,has_more:bool} */
    public static function parsePage(array $response, int $cursor): array
    {
        $body = is_array($response['body'] ?? null) ? $response['body'] : [];
        $httpStatus = (int) ($response['http_status'] ?? 0);
        if ($httpStatus < 200 || $httpStatus >= 300 || (int) ($body['code'] ?? -1) !== 0) {
            $message = trim((string) ($body['message'] ?? ''));
            throw new RuntimeException($message !== '' ? $message : '洛阳药房药材目录同步失败');
        }

        $data = is_array($body['data'] ?? null) ? $body['data'] : [];
        $items = is_array($data['items'] ?? null) ? array_values(array_filter(
            $data['items'],
            static fn ($item): bool => is_array($item)
        )) : [];
        $nextCursor = max(0, (int) ($data['next_cursor'] ?? $cursor));
        $hasMore = !empty($data['has_more']);
        if ($hasMore && $nextCursor <= $cursor) {
            throw new RuntimeException('洛阳药房药材目录游标未推进，已停止同步');
        }

        return ['items' => $items, 'next_cursor' => $nextCursor, 'has_more' => $hasMore];
    }

    /**
     * @param array<string,mixed>|null $existing
     * @param array<string,mixed> $remote
     * @return array{action:string,values:array<string,mixed>,deactivated:int}
     */
    public static function merge(?array $existing, array $remote): array
    {
        $code = trim((string) ($remote['medicine_code'] ?? ''));
        if ($code === '') {
            throw new RuntimeException('洛阳药房药材目录包含空 medicine_code');
        }

        $deleted = !empty($remote['deleted']) || !empty($remote['remote_deleted']);
        $values = [
            'medicine_code' => $code,
            'name' => trim((string) ($remote['name'] ?? '')),
            'brand' => trim((string) ($remote['brand'] ?? '')),
            'unit' => trim((string) ($remote['unit'] ?? '')),
            'settlement_price' => self::decimal($remote['settlement_price'] ?? 0),
            'retail_price' => self::decimal($remote['retail_price'] ?? 0),
            'status' => $deleted ? 0 : (int) ($remote['status'] ?? 0),
            'catalog_version' => max(0, (int) ($remote['catalog_version'] ?? 0)),
            'remote_deleted' => $deleted ? 1 : 0,
        ];

        if ($existing === null) {
            return [
                'action' => 'created',
                'values' => $values,
                'deactivated' => $values['status'] === 0 ? 1 : 0,
            ];
        }

        $existingComparable = [
            'medicine_code' => trim((string) ($existing['medicine_code'] ?? '')),
            'name' => trim((string) ($existing['name'] ?? '')),
            'brand' => trim((string) ($existing['brand'] ?? '')),
            'unit' => trim((string) ($existing['unit'] ?? '')),
            'settlement_price' => self::decimal($existing['settlement_price'] ?? 0),
            'retail_price' => self::decimal($existing['retail_price'] ?? 0),
            'status' => (int) ($existing['status'] ?? 0),
            'catalog_version' => max(0, (int) ($existing['catalog_version'] ?? 0)),
            'remote_deleted' => (int) ($existing['remote_deleted'] ?? 0),
        ];
        $deactivated = $existingComparable['status'] === 1 && $values['status'] === 0 ? 1 : 0;

        return [
            'action' => $existingComparable === $values ? 'unchanged' : 'updated',
            'values' => $values,
            'deactivated' => $deactivated,
        ];
    }

    private static function decimal(mixed $value): string
    {
        return number_format(max(0.0, (float) $value), 4, '.', '');
    }
}