<?php
declare(strict_types=1);

namespace app\api\service;

use app\api\model\DyVideoUser;
use app\api\model\DyVideoUserTitk;
use app\api\model\Member;

/**
 * 平台账号管理服务。
 *
 * 本服务只补齐小程序“平台账号管理”页面所需的最基础只读能力，
 * 关键查询与状态语义按 acgpmw `dyai/controller/platform.php` 的
 * `index()` / `get_zhanghu_list()` 对齐，不擅自扩展解绑、授权等高风险动作。
 */
class PlatformService
{
    /**
     * 平台映射按 acgpmw `data/other/platforms_py.php` 对齐。
     */
    private const PLATFORM_KEY_MAP = [
        0 => 'douyin',
        1 => 'kuaishou',
        2 => 'baijiahao',
        3 => 'xiaohongshu',
        4 => 'shipinhao',
        5 => 'bilibili',
        6 => 'gongzhonghao',
        10 => 'tiktok',
    ];

    /**
     * 页面展示名称。
     *
     * acgpmw 模板内部会通过 `$this->platform_info[$platform]` 展示中文平台名，
     * 这里在 API 中直接返回前端所需文案，避免小程序自行猜测。
     */
    private const PLATFORM_NAME_MAP = [
        0 => '抖音',
        1 => '快手',
        2 => '百家号',
        3 => '小红书',
        4 => '视频号',
        5 => 'B站',
        6 => '公众号',
        10 => 'TikTok',
    ];

    /**
     * 获取平台账号管理页列表数据。
     *
     * @param int $userid 当前登录用户ID
     * @param int|null $platform 当前筛选平台；为空时返回全部可见平台
     * @return array
     * @throws \Exception
     */
    public function getAccountList(int $userid, ?int $platform = null): array
    {
        $member = Member::findByUserid($userid);
        if (!$member) {
            throw new \Exception('用户不存在', 4006);
        }

        $productInfo = $member->getProductInfo();
        $availablePlatforms = $this->resolveAvailablePlatforms($member, $productInfo);

        if (empty($availablePlatforms)) {
            throw new \Exception('暂无平台管理权限', 4004);
        }

        if ($platform !== null && !in_array($platform, $availablePlatforms, true)) {
            throw new \Exception('当前套餐暂无该平台权限', 4004);
        }

        $targetPlatform = $platform;
        $accounts = DyVideoUser::getPlatformAccountsByUserId($userid, $targetPlatform);

        $accountItems = [];
        foreach ($accounts as $account) {
            $accountPlatform = (int) $account->platform;

            if (!in_array($accountPlatform, $availablePlatforms, true)) {
                continue;
            }

            $accountItems[] = $this->buildAccountItem($account->toArray());
        }

        $platformTabs = $this->buildPlatformTabs($availablePlatforms, $userid);
        $summary = $this->buildSummary($accountItems);

        return [
            'filters' => [
                'current_platform' => $targetPlatform,
                'platforms' => $platformTabs,
            ],
            'summary' => $summary,
            'list' => $accountItems,
        ];
    }

    /**
     * 计算当前用户可见平台。
     *
     * 该逻辑直接对齐 acgpmw `platform::index()`：
     * 1. 从套餐 `product_list.platforms` 读取平台权限
     * 2. 若为 146/147 且不在特殊账号名单中，仅允许抖音平台
     *
     * @param Member $member 当前登录用户
     * @param array|null $productInfo 套餐信息
     * @return array<int>
     */
    private function resolveAvailablePlatforms(Member $member, ?array $productInfo): array
    {
        $platformText = trim((string) ($productInfo['platforms'] ?? ''), ',');
        if ($platformText === '') {
            return [];
        }

        $platforms = array_values(array_filter(array_map('intval', explode(',', $platformText)), static function ($item) {
            return array_key_exists($item, self::PLATFORM_NAME_MAP);
        }));

        $specialAccounts = $this->loadSpecialAccounts();
        $isRestrictedVType = in_array((int) $member->v_type, [146, 147], true);
        $isSpecialAccount = in_array((int) $member->userid, $specialAccounts, true);

        if ($isRestrictedVType && !$isSpecialAccount) {
            return [0];
        }

        return $platforms;
    }

    /**
     * 构建前端平台筛选项。
     *
     * @param array<int> $platforms 当前用户可见平台
     * @param int $userid 当前用户ID
     * @return array<int, array<string, mixed>>
     */
    private function buildPlatformTabs(array $platforms, int $userid): array
    {
        $tabs = [
            [
                'id' => null,
                'name' => '全部平台',
                'key' => 'all',
                'count' => 0,
            ],
        ];

        $allCount = 0;
        foreach ($platforms as $platform) {
            $count = DyVideoUser::where('userid', $userid)
                ->where('disabled', 0)
                ->where('platform', $platform)
                ->count();

            $allCount += (int) $count;
            $tabs[] = [
                'id' => $platform,
                'name' => self::PLATFORM_NAME_MAP[$platform] ?? ('平台' . $platform),
                'key' => self::PLATFORM_KEY_MAP[$platform] ?? ('platform_' . $platform),
                'count' => (int) $count,
            ];
        }

        $tabs[0]['count'] = $allCount;

        return $tabs;
    }

    /**
     * 把数据库记录转换为前端可直接渲染的账号卡片。
     *
     * 状态字段解释按 acgpmw `get_zhanghu_list()` 三列展示对齐：
     * - `is_endauth` => 账号授权状态
     * - `aa_endauth` => 数据授权状态
     * - `browser` => 异常状态
     *
     * @param array $account dy_video_user 单条记录
     * @return array<string, mixed>
     */
    private function buildAccountItem(array $account): array
    {
        $platform = (int) ($account['platform'] ?? 0);
        $countryName = '';

        if ($platform === 10) {
            $titkInfo = DyVideoUserTitk::findByVuid((int) $account['id']);
            $countryName = (string) ($titkInfo->country_name ?? '');
        }

        $accountAuth = (int) ($account['is_endauth'] ?? 0) === 1
            ? $this->buildStatusBlock('授权到期', 'danger', '请重新完成平台授权')
            : $this->buildStatusBlock('授权正常', 'success', '当前账号授权可用');

        $dataAuth = (int) ($account['aa_endauth'] ?? 0) === 1
            ? $this->buildStatusBlock('授权到期', 'danger', '请重新完成数据授权')
            : $this->buildStatusBlock('授权正常', 'success', '当前数据授权可用');

        $exceptionStatus = (int) ($account['browser'] ?? 0) === 1
            ? $this->buildStatusBlock('发布异常', 'warning', '发布链路存在异常，需要人工处理')
            : $this->buildStatusBlock('使用正常', 'success', '当前账号发布链路正常');

        return [
            'id' => (int) $account['id'],
            'platform' => $platform,
            'platform_name' => self::PLATFORM_NAME_MAP[$platform] ?? ('平台' . $platform),
            'platform_key' => self::PLATFORM_KEY_MAP[$platform] ?? ('platform_' . $platform),
            'nickname' => (string) ($account['dy_nickname'] ?? ''),
            'avatar' => (string) ($account['dy_avatar'] ?? ''),
            'intro' => (string) ($account['dy_intro'] ?? ''),
            'phone' => (string) ($account['info_shouji'] ?? ''),
            'country_name' => $countryName,
            'proviceid' => (int) ($account['proviceid'] ?? 0),
            'is_lanv' => (int) ($account['is_lanv'] ?? 0) === 1,
            'is_qyh' => (int) ($account['is_qyh'] ?? 0) === 1,
            'account_status' => $accountAuth,
            'data_status' => $dataAuth,
            'exception_status' => $exceptionStatus,
            'status_overview' => $this->buildOverviewStatus($accountAuth, $dataAuth, $exceptionStatus),
            'display_code' => '#P' . (int) $account['id'],
        ];
    }

    /**
     * 构建单个状态块。
     *
     * @param string $text 显示文案
     * @param string $tone 视觉色调：success / warning / danger
     * @param string $hint 补充说明
     * @return array<string, string>
     */
    private function buildStatusBlock(string $text, string $tone, string $hint): array
    {
        return [
            'text' => $text,
            'tone' => $tone,
            'hint' => $hint,
        ];
    }

    /**
     * 汇总账号卡片主状态，便于列表页用一个醒目标记表示当前账号健康度。
     *
     * @param array $accountAuth 账号授权状态
     * @param array $dataAuth 数据授权状态
     * @param array $exceptionStatus 异常状态
     * @return array<string, string>
     */
    private function buildOverviewStatus(array $accountAuth, array $dataAuth, array $exceptionStatus): array
    {
        if ($accountAuth['tone'] === 'danger' || $dataAuth['tone'] === 'danger') {
            return $this->buildStatusBlock('需重新授权', 'danger', '账号授权或数据授权已到期');
        }

        if ($exceptionStatus['tone'] === 'warning') {
            return $this->buildStatusBlock('存在异常', 'warning', '当前账号发布链路异常');
        }

        return $this->buildStatusBlock('状态正常', 'success', '账号与发布状态均正常');
    }

    /**
     * 统计当前筛选结果。
     *
     * @param array<int, array<string, mixed>> $items 列表项
     * @return array<string, int>
     */
    private function buildSummary(array $items): array
    {
        $summary = [
            'total' => count($items),
            'need_reauth_count' => 0,
            'browser_exception_count' => 0,
            'normal_count' => 0,
        ];

        foreach ($items as $item) {
            $needReauth = $item['account_status']['tone'] === 'danger' || $item['data_status']['tone'] === 'danger';
            $hasBrowserException = $item['exception_status']['tone'] === 'warning';

            if ($needReauth) {
                $summary['need_reauth_count']++;
            }

            if ($hasBrowserException) {
                $summary['browser_exception_count']++;
            }

            if (!$needReauth && !$hasBrowserException) {
                $summary['normal_count']++;
            }
        }

        return $summary;
    }

    /**
     * 加载 acgpmw 的特殊账号名单。
     *
     * 这里优先读取基线项目 `/root/work/acgpmw/data/other/tw_special_account.php`，
     * 保证 146/147 套餐用户的平台权限限制与原系统保持一致；
     * 若文件不存在，则退回空数组，接口仍可工作。
     *
     * @return array<int>
     */
    private function loadSpecialAccounts(): array
    {
        $specialAccountFile = '/root/work/acgpmw/data/other/tw_special_account.php';

        if (!is_file($specialAccountFile)) {
            return [];
        }

        $accounts = require $specialAccountFile;

        return is_array($accounts)
            ? array_values(array_map('intval', $accounts))
            : [];
    }
}