<?php

namespace Modules\EcommerceFinance\Services;

use Illuminate\Http\Client\PendingRequest;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Http;
use RuntimeException;

class JushuitanOpenApiClient
{
    /**
     * @return array{records:list<array<string,mixed>>,source_rows:int,current_page:int,total_pages:int,total_count:int}
     */
    public function getCostPriceOperationHistory(
        Carbon $start,
        Carbon $end,
        int $page,
        int $pageSize,
    ): array {
        $payload = $this->request([
            'current_page' => max($page, 1),
            'page_size' => min(max($pageSize, 1), 2000),
            'start_time' => $start->format('Y-m-d H:i:s'),
            'end_time' => $end->format('Y-m-d H:i:s'),
        ]);
        $data = is_array($payload['data'] ?? null) ? $payload['data'] : [];
        $pageInfo = is_array($data['page'] ?? null) ? $data['page'] : [];

        return [
            'records' => $this->normalizeCostPriceOperations($data['list'] ?? []),
            'source_rows' => is_array($data['list'] ?? null) ? count($data['list']) : 0,
            'current_page' => max((int) ($pageInfo['current_page'] ?? $page), 1),
            'total_pages' => max((int) ($pageInfo['pages'] ?? 0), 0),
            'total_count' => max((int) ($pageInfo['count'] ?? 0), 0),
        ];
    }

    /** @param array<string,mixed> $biz @return array<string,mixed> */
    private function request(array $biz): array
    {
        $appKey = trim((string) config('services.jushuitan.app_key'));
        $appSecret = trim((string) config('services.jushuitan.app_secret'));
        $accessToken = trim((string) config('services.jushuitan.access_token'));
        if ($appKey === '' || $appSecret === '' || $accessToken === '') {
            throw new RuntimeException('jushuitan_api_credentials_missing');
        }

        $params = [
            'access_token' => $accessToken,
            'app_key' => $appKey,
            'biz' => json_encode(
                $biz,
                JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR,
            ),
            'charset' => 'utf-8',
            'timestamp' => (string) now()->timestamp,
            'version' => '2',
        ];
        $params['sign'] = $this->sign($params, $appSecret);

        $baseUrl = rtrim((string) config('services.jushuitan.base_url'), '/');
        $path = (string) config(
            'services.jushuitan.product_operation_history_path',
            '/open/webapi/itemapi/itemsku/queryitemskuopshistory',
        );
        /** @var PendingRequest $request */
        $request = Http::asForm()
            ->acceptJson()
            ->timeout(max((int) config('services.jushuitan.timeout', 20), 1));
        $response = $request->post($baseUrl . '/' . ltrim($path, '/'), $params);

        if (! $response->successful()) {
            throw new RuntimeException('jushuitan_api_http_' . $response->status());
        }

        $payload = $response->json();
        if (! is_array($payload)) {
            throw new RuntimeException('jushuitan_api_invalid_json');
        }
        $code = (int) ($payload['code'] ?? -1);
        if ($code !== 0) {
            throw new RuntimeException('jushuitan_api_code_' . $code);
        }

        return $payload;
    }

    /** @param array<string,mixed> $params */
    private function sign(array $params, string $appSecret): string
    {
        ksort($params, SORT_STRING);
        $plain = $appSecret;
        foreach ($params as $key => $value) {
            if ($key === 'sign' || $value === null || $value === '') {
                continue;
            }
            $plain .= $key . (string) $value;
        }

        return md5($plain);
    }

    /** @param mixed $records @return list<array<string,mixed>> */
    private function normalizeCostPriceOperations(mixed $records): array
    {
        if (! is_array($records)) {
            return [];
        }

        $result = [];
        foreach ($records as $record) {
            if (! is_array($record)) {
                continue;
            }
            $skuId = trim((string) ($record['sku_id'] ?? ''));
            $description = trim((string) ($record['operation_description'] ?? ''));
            if ($skuId === '' || ! str_contains($description, '采购价')) {
                continue;
            }

            [$beforePrice, $afterPrice] = $this->pricesFromDescription($description);
            $result[] = [
                'operation_id' => (string) ($record['autoid'] ?? ''),
                'sku_id' => $skuId,
                'i_id' => $this->nullableString($record['i_id'] ?? null),
                'product_name' => $this->nullableString($record['name'] ?? null),
                'properties_value' => $this->nullableString($record['properties_value'] ?? null),
                'sku_type' => $this->nullableString($record['sku_type'] ?? null),
                'operation_type' => $this->nullableString($record['operation_type'] ?? null),
                'operation_description' => $description,
                'operator_name' => $this->nullableString($record['creator_name'] ?? null),
                'operated_at' => $this->nullableString($record['created'] ?? null),
                'before_price' => $beforePrice,
                'after_price' => $afterPrice,
                'diff_amount' => ($beforePrice === null || $afterPrice === null)
                    ? null
                    : $afterPrice - $beforePrice,
            ];
        }

        return $result;
    }

    /** @return array{0:?float,1:?float} */
    private function pricesFromDescription(string $description): array
    {
        $matched = preg_match(
            '/采购价\s*[：:]\s*(-?\d+(?:\.\d+)?)\s*(?:->|=>|→|至)\s*(-?\d+(?:\.\d+)?)/u',
            $description,
            $matches,
        );
        if ($matched !== 1) {
            return [null, null];
        }

        return [(float) $matches[1], (float) $matches[2]];
    }

    private function nullableString(mixed $value): ?string
    {
        if ($value === null) {
            return null;
        }
        $value = trim((string) $value);

        return $value === '' ? null : $value;
    }
}