<?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,has_next:bool}
     */
    public function getCostPriceOperationHistory(
        Carbon $start,
        Carbon $end,
        int $page,
        int $pageSize,
    ): array {
        $payload = $this->request([
            'page_index' => max($page, 1),
            'page_size' => min(max($pageSize, 1), 50),
            'modified_begin' => $start->format('Y-m-d H:i:s'),
            'modified_end' => $end->format('Y-m-d H:i:s'),
        ]);
        $records = is_array($payload['datas'] ?? null) ? $payload['datas'] : [];

        return [
            'records' => $this->normalizeCostPriceOperations($records),
            'source_rows' => count($records),
            'current_page' => max((int) ($payload['page_index'] ?? $page), 1),
            'has_next' => (bool) ($payload['has_next'] ?? false),
        ];
    }

    /** @param array<string,mixed> $biz @return array<string,mixed> */
    private function request(array $biz): array
    {
        $partnerId = trim((string) config('services.jushuitan.partner_id'));
        $partnerKey = trim((string) config('services.jushuitan.partner_key'));
        $token = trim((string) config('services.jushuitan.token'));
        if ($partnerId === '' || $partnerKey === '' || $token === '') {
            throw new RuntimeException('jushuitan_classic_api_credentials_missing');
        }

        $method = (string) config(
            'services.jushuitan.product_operation_history_method',
            'worklog.query',
        );
        $timestamp = (string) now()->timestamp;
        // URL parameter order is part of the classic API signature contract.
        $params = [
            'method' => $method,
            'partnerid' => $partnerId,
            'token' => $token,
            'ts' => $timestamp,
        ];
        $params['sign'] = $this->sign($method, $partnerId, $token, $timestamp, $partnerKey);

        $baseUrl = (string) config(
            'services.jushuitan.base_url',
            'https://open.erp321.com/api/open/query.aspx',
        );
        /** @var PendingRequest $request */
        $request = Http::asJson()
            ->acceptJson()
            ->timeout(max((int) config('services.jushuitan.timeout', 20), 1));
        $response = $request->post(
            $baseUrl . '?' . http_build_query($params, '', '&', PHP_QUERY_RFC3986),
            $biz,
        );

        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 ($code !== 0) {
            throw new RuntimeException($this->errorCode($code, $payload));
        }

        return $payload;
    }

    /** @param array<string,mixed> $payload */
    private function errorCode(int $code, array $payload): string
    {
        $message = mb_strtolower(trim((string) ($payload['msg'] ?? $payload['message'] ?? '')));
        if ($code === 100 && str_contains($message, 'partnerid')) {
            return 'jushuitan_classic_api_partner_id_invalid';
        }

        return 'jushuitan_api_code_' . $code;
    }

    private function sign(
        string $method,
        string $partnerId,
        string $token,
        string $timestamp,
        string $partnerKey,
    ): string
    {
        return md5($method . $partnerId . 'token' . $token . 'ts' . $timestamp . $partnerKey);
    }

    /** @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['remark'] ?? $record['operation_description'] ?? ''));
            if ($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['type'] ?? $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;
    }
}