<?php

namespace app\haichao;

use think\exception\ValidateException;
use think\facade\Log;

abstract class HaichaoBridge
{
    private array $api = [
        'appid' => '',
        'appSecret' => '',
        'api' => 'https://openapi.jushuitan.com/',
        'access_token' => '',
        'shopId' => '',
    ];

    private string $tokenFile = 'runtime/jstdata/jst_token_data.json';

    public function __construct()
    {
        $this->api['appid'] = env('JST_APP_KEY', '');
        $this->api['appSecret'] = env('JST_APP_SECRET', '');
        $this->api['api'] = env('JST_API', 'https://openapi.jushuitan.com/');
        $this->api['access_token'] = $this->getToken();
        $this->api['shopId'] = (string)env('JST_SHOP_ID', '');
    }

    public function getShopId(): string
    {
        return $this->api['shopId'];
    }

    /**
     * 聚水潭开放平台请求封装
     * @param string $api
     * @param array $data
     * @param array $addonBody
     * @return array
     */
    protected function post(string $api, array $data = [], array $addonBody = []): array
    {
        return $this->postInternal($api, $data, $addonBody);
    }

    private function postInternal(string $api, array $data = [], array $addonBody = [], int $attempt = 0, bool $tokenRefreshed = false): array
    {
        if (!$this->api['appid'] || !$this->api['appSecret'] || !$this->api['access_token']) {
            throw new ValidateException('JST config missing');
        }
        $apiName = ltrim($api, '/');
        if ($apiName === 'open/inventory/query') {
            $skuIdsRaw = $data['sku_ids'] ?? '';
            $skuIdsList = [];
            if (is_array($skuIdsRaw)) {
                $skuIdsList = array_values(array_filter(array_map('trim', $skuIdsRaw), static fn($v) => $v !== ''));
                $skuIdsRaw = implode(',', $skuIdsList);
            } else {
                $skuIdsRaw = (string)$skuIdsRaw;
                $skuIdsList = array_values(array_filter(array_map('trim', explode(',', trim($skuIdsRaw, ", \t\n\r\0\x0B"))), static fn($v) => $v !== ''));
            }
            Log::info('jst.api.inventory.query.request ' . json_encode([
                    'api' => $apiName,
                    'attempt' => $attempt,
                    'page_index' => $data['page_index'] ?? null,
                    'page_num' => $data['page_num'] ?? null,
                    'page_size' => $data['page_size'] ?? null,
                    'sku_ids_count' => count($skuIdsList),
                    'sku_ids' => $skuIdsList,
                    'sku_ids_raw' => $skuIdsRaw,
                ], JSON_UNESCAPED_UNICODE));
        }
        $this->throttle();
        $time = time();
        $baseBody = [
            'access_token' => $this->api['access_token'],
            'app_key' => $this->api['appid'],
        ];
        $baseBody = array_merge($baseBody, $addonBody);
        $baseBody['biz'] = json_encode($data, JSON_UNESCAPED_UNICODE);
        $baseBody['charset'] = 'utf-8';
        $baseBody['timestamp'] = $time;
        $baseBody['version'] = '2';
        $baseBody['sign'] = $this->sign($baseBody);
        $options['http'] = [
            'timeout' => 60,
            'method' => 'POST',
            'header' => 'Content-Type: application/json;charset=utf-8',
            'content' => http_build_query($baseBody)
        ];
        $raw = file_get_contents("{$this->api['api']}$api", false, stream_context_create($options));
        $rt = json_decode((string)$raw, true);
        $respPreview = null;
        try {
            $respPreview = mb_substr((string)$raw, 0, 2000);
        } catch (\Throwable $e) {
        }
        Log::info('jst.api.response ' . json_encode([
                'api' => $api,
                'code' => $rt['code'] ?? null,
                'msg' => $rt['msg'] ?? null,
                'preview' => $respPreview,
            ], JSON_UNESCAPED_UNICODE));
        if (!is_array($rt) || !array_key_exists('code', $rt)) {
            Log::error('JST response invalid ' . json_encode([
                    'api' => $api,
                ], JSON_UNESCAPED_UNICODE));
            throw new ValidateException('JST response invalid');
        }
        if ($rt['code'] != 0) {
            $code = (int)$rt['code'];
            if (!$tokenRefreshed && $this->isTokenError($rt)) {
                $this->api['access_token'] = $this->getToken(true);
                return $this->postInternal($api, $data, $addonBody, $attempt + 1, true);
            }
            if ($this->isRateLimitError($code) && $attempt < 6) {
                $sleepMs = $this->getRateLimitSleepMs($code, $attempt);
                usleep($sleepMs * 1000);
                return $this->postInternal($api, $data, $addonBody, $attempt + 1, $tokenRefreshed);
            }
            Log::error('JST request failed ' . json_encode([
                    'api' => $api,
                    'code' => $code,
                    'msg' => (string)($rt['msg'] ?? ''),
                ], JSON_UNESCAPED_UNICODE));
            throw new ValidateException($rt['msg'] ?? 'JST error');
        }
        return $rt;
    }

    private function throttle(): void
    {
        static $lastAt = 0.0;
        static $recent = [];

        $minGap = 0.65;
        while (true) {
            $now = microtime(true);
            $gap = $now - $lastAt;
            if ($gap < $minGap) {
                usleep((int)(($minGap - $gap) * 1000000));
                continue;
            }

            $recent = array_values(array_filter($recent, static fn($t) => ($now - $t) < 60));
            if (count($recent) >= 95) {
                $oldest = $recent[0] ?? $now;
                $wait = 60 - ($now - $oldest) + 0.2;
                if ($wait > 0) {
                    usleep((int)($wait * 1000000));
                    continue;
                }
            }

            $lastAt = microtime(true);
            $recent[] = $lastAt;
            return;
        }
    }

    private function isRateLimitError(int $code): bool
    {
        return $code === 199 || $code === 200;
    }

    private function getRateLimitSleepMs(int $code, int $attempt): int
    {
        $jitter = random_int(0, 300);
        if ($code === 200) {
            return min(60000, (int)(6000 * (1 + $attempt)) + $jitter);
        }
        return min(10000, (int)(900 * (1 + $attempt)) + $jitter);
    }

    private function sign(array $data): string
    {
        $computerStr = "";
        foreach ($data as $k => $v) {
            $computerStr .= $k . $v;
        }
        $computerStr = $this->api['appSecret'] . $computerStr;
        return md5($computerStr);
    }

    private function isTokenError(array $rt): bool
    {
        $msg = (string)($rt['msg'] ?? '');
        if (!$msg) return false;
        $msgLower = strtolower($msg);
        return strpos($msgLower, 'access_token') !== false || strpos($msgLower, 'token') !== false;
    }

    private function getToken(bool $forceRefresh = false): string
    {
        $tokenInfo = $this->readTokenInfo();
        if ($tokenInfo === null) {
            $tokenInfo = $this->autoInitTokenFile();
            if ($tokenInfo === null) {
                throw new ValidateException('JST token missing, please check .env JST_ACCESS_TOKEN config');
            }
        }
        if (!$forceRefresh && $tokenInfo) {
            $accessToken = (string)($tokenInfo['access_token'] ?? '');
            $expiresIn = (int)($tokenInfo['expires_in'] ?? 0);
            $tokenTime = (int)($tokenInfo['time'] ?? 0);
            if ($accessToken && $expiresIn > 0 && $tokenTime > 0) {
                if (time() < ($tokenTime + $expiresIn - 3600)) {
                    return $accessToken;
                }
            }
        }

        $refreshToken = (string)($tokenInfo['refresh_token'] ?? '');
        if (!$refreshToken) {
            $refreshToken = trim((string)env('JST_REFRESH_TOKEN', ''));
        }
        if ($refreshToken) {
            $newTokenInfo = $this->refreshAccessToken($refreshToken);
            $this->writeTokenInfo($newTokenInfo);
            return (string)$newTokenInfo['access_token'];
        }

        $code = (string)env('JST_AUTH_CODE', '');
        if ($code) {
            $newTokenInfo = $this->code2accessToken($code);
            $this->writeTokenInfo($newTokenInfo);
            return (string)$newTokenInfo['access_token'];
        }

        throw new ValidateException('JST token missing');
    }

    private function autoInitTokenFile(): ?array
    {
        $accessToken = (string)env('JST_ACCESS_TOKEN', '');
        $refreshToken = (string)env('JST_REFRESH_TOKEN', '');
        $expiresIn = (int)env('JST_EXPIRES_IN', 2592000);

        if (empty($accessToken)) {
            return null;
        }

        $tokenInfo = [
            'access_token' => $accessToken,
            'expires_in' => $expiresIn,
            'refresh_token' => $refreshToken,
            'time' => time(),
        ];

        $this->writeTokenInfo($tokenInfo);
        return $tokenInfo;
    }

    private function refreshAccessToken(string $refreshToken): array
    {
        $params = [];
        $params['app_key'] = $this->api['appid'];
        $params['timestamp'] = time();
        $params['grant_type'] = 'refresh_token';
        $params['charset'] = 'utf-8';
        $params['refresh_token'] = $refreshToken;
        $params['scope'] = 'all';
        $params['sign'] = $this->sign($params);

        $url = "{$this->api['api']}openWeb/auth/refreshToken";
        $raw = file_get_contents($url, false, stream_context_create([
            'http' => [
                'timeout' => 60,
                'method' => 'POST',
                'header' => 'Content-Type: application/x-www-form-urlencoded;charset=UTF-8',
                'content' => http_build_query($params),
            ],
        ]));
        $rt = json_decode((string)$raw, true);
        if (!is_array($rt) || !array_key_exists('code', $rt)) {
            throw new ValidateException('JST response invalid');
        }
        if ((int)$rt['code'] !== 0) {
            throw new ValidateException((string)($rt['msg'] ?? 'JST error'));
        }
        $data = $rt['data'] ?? [];
        if (!is_array($data) || empty($data['access_token'])) {
            throw new ValidateException('JST token invalid');
        }
        return $data;
    }

    private function code2accessToken(string $code): array
    {
        $params = [];
        $params['app_key'] = $this->api['appid'];
        $params['timestamp'] = time();
        $params['grant_type'] = 'authorization_code';
        $params['charset'] = 'utf-8';
        $params['code'] = $code;
        $params['sign'] = $this->sign($params);

        $url = "{$this->api['api']}openWeb/auth/accessToken";
        $raw = file_get_contents($url, false, stream_context_create([
            'http' => [
                'timeout' => 60,
                'method' => 'POST',
                'header' => 'Content-Type: application/x-www-form-urlencoded;charset=UTF-8',
                'content' => http_build_query($params),
            ],
        ]));
        $rt = json_decode((string)$raw, true);
        if (!is_array($rt) || !array_key_exists('code', $rt)) {
            throw new ValidateException('JST response invalid');
        }
        if ((int)$rt['code'] !== 0) {
            throw new ValidateException((string)($rt['msg'] ?? 'JST error'));
        }
        $data = $rt['data'] ?? [];
        if (!is_array($data) || empty($data['access_token'])) {
            throw new ValidateException('JST token invalid');
        }
        return $data;
    }

    private function readTokenInfo(): ?array
    {
        $file = root_path() . $this->tokenFile;
        if (!is_file($file)) {
            Log::info('JST token file not found, will try to auto init from .env');
            return null;
        }
        $raw = file_get_contents($file);
        if (!$raw) return null;
        $arr = json_decode((string)$raw, true);
        if (!is_array($arr) || empty($arr['access_token'])) {
            Log::warning('JST token file is invalid, will try to auto init from .env');
            return null;
        }
        return $arr;
    }

    private function writeTokenInfo(array $tokenInfo): void
    {
        $dir = root_path() . 'runtime/jstdata';
        if (!is_dir($dir)) {
            mkdir($dir, 0777, true);
        }
        $tokenInfo['time'] = time();
        file_put_contents(root_path() . $this->tokenFile, json_encode($tokenInfo, JSON_UNESCAPED_UNICODE));
    }
}