<?php

namespace app\chukebao\controller;

use app\chukebao\model\AiKnowledgeBaseType;
use library\ResponseHelper;
use think\Db;

/**
 * 模块 D · 知识库（需求三 §3.2 · 需求六 §6.7）
 * 列表 = 存客宝已分配（enabledForTouchkebao=true），非全量；默认库由存客宝项目配置。
 * 配置真源在存客宝 H5 + Server；触客宝只读已分配。
 * 数据表：ck_kb_touchkebao_config（懒建，存放存客宝下发的分配结果）。
 */
class KnowledgeBaseController extends BaseController
{
    private function ensureTable()
    {
        Db::execute("CREATE TABLE IF NOT EXISTS `ck_kb_touchkebao_config` (
            `id` int(11) NOT NULL AUTO_INCREMENT,
            `companyId` int(11) NOT NULL DEFAULT 0,
            `kbId` int(11) NOT NULL DEFAULT 0,
            `kbName` varchar(128) NOT NULL DEFAULT '',
            `isDefault` tinyint(1) NOT NULL DEFAULT 0,
            `kefuId` int(11) NOT NULL DEFAULT 0,
            `currentKbId` int(11) NOT NULL DEFAULT 0,
            `enabled` tinyint(1) NOT NULL DEFAULT 1,
            `updateTime` int(11) NOT NULL DEFAULT 0,
            PRIMARY KEY (`id`),
            KEY `idx_company` (`companyId`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
    }

    /**
     * 仅返回已分配知识库
     * GET /v1/kefu/ai/knowledge-bases
     */
    public function knowledgeBases()
    {
        $this->ensureTable();
        $companyId = $this->getUserInfo('companyId');
        $kefuId = $this->getUserInfo('id');

        // 仅返回 enabled 的库（存客宝下发）；无分配 → 回退读存客宝项目知识库（REQ-TKB-133-C）
        $rows = Db::name('kb_touchkebao_config')
            ->where('companyId', $companyId)
            ->where('enabled', 1)
            ->where('kefuId', 0) // 项目级开放
            ->select();

        $list = [];
        $defaultKbId = null;
        foreach ($rows as $r) {
            $list[] = [
                'id' => (int)$r['kbId'],
                'name' => $r['kbName'],
                'isDefault' => (bool)$r['isDefault'],
            ];
            if ($r['isDefault']) {
                $defaultKbId = (int)$r['kbId'];
            }
        }

        if (empty($list)) {
            $fallback = $this->fallbackKnowledgeFromWorkspace($companyId);
            $list = $fallback['list'];
            $defaultKbId = $fallback['defaultKbId'];
        }

        // 客服个人当前选择（覆盖默认，须在已开放范围内）
        $currentKbId = $defaultKbId;
        $myCurrent = Db::name('kb_touchkebao_config')
            ->where('companyId', $companyId)
            ->where('kefuId', $kefuId)
            ->value('currentKbId');
        if ($myCurrent && in_array((int)$myCurrent, array_column($list, 'id'))) {
            $currentKbId = (int)$myCurrent;
        }

        return ResponseHelper::success([
            'defaultKbId' => $defaultKbId,
            'currentKbId' => $currentKbId,
            'list' => $list,
        ]);
    }

    /**
     * 客服在已分配范围内切换默认库
     * POST /v1/kefu/ai/knowledge-base/select
     */
    public function selectKnowledgeBase()
    {
        $this->ensureTable();
        $companyId = $this->getUserInfo('companyId');
        $kefuId = $this->getUserInfo('id');
        $kbId = (int)$this->request->param('kbId', 0);
        if (!$kbId) {
            return ResponseHelper::error('kbId 缺失', 400);
        }
        // 校验是否在已开放范围内
        $allowed = Db::name('kb_touchkebao_config')
            ->where('companyId', $companyId)
            ->where('enabled', 1)
            ->where('kbId', $kbId)
            ->count();
        if (!$allowed) {
            return ResponseHelper::error('该知识库未对触客宝开放', 403);
        }
        $exist = Db::name('kb_touchkebao_config')
            ->where('companyId', $companyId)
            ->where('kefuId', $kefuId)
            ->find();
        if ($exist) {
            Db::name('kb_touchkebao_config')->where('id', $exist['id'])
                ->update(['currentKbId' => $kbId, 'updateTime' => time()]);
        } else {
            Db::name('kb_touchkebao_config')->insert([
                'companyId' => $companyId,
                'kefuId' => $kefuId,
                'currentKbId' => $kbId,
                'enabled' => 0,
                'updateTime' => time(),
            ]);
        }
        return ResponseHelper::success(['currentKbId' => $kbId], '已切换');
    }

    /**
     * REQ-TKB-133-C：本地分配表为空时，聚合存客宝 AiKnowledgeTouchkebao 配置 + 项目知识库
     *
     * @return array{list:array<int,array{id:int,name:string,isDefault:bool}>,defaultKbId:?int}
     */
    private function fallbackKnowledgeFromWorkspace(int $companyId): array
    {
        $kbRows = AiKnowledgeBaseType::where([
            ['isDel', '=', 0],
            ['status', '=', 1],
        ])->where(function ($q) use ($companyId) {
            $q->where('companyId', $companyId)->whereOr('companyId', 0);
        })->field('id,name,companyId')
            ->order('companyId desc,id desc')
            ->select();

        if (empty($kbRows)) {
            return ['list' => [], 'defaultKbId' => null];
        }

        $cfgRows = Db::name('kb_touchkebao_config')
            ->where('companyId', $companyId)
            ->where('kefuId', 0)
            ->select();
        $cfgMap = [];
        $defaultKbId = null;
        foreach ($cfgRows ?: [] as $c) {
            $cfgMap[(int)$c['kbId']] = $c;
            if (!empty($c['isDefault'])) {
                $defaultKbId = (int)$c['kbId'];
            }
        }

        $list = [];
        $now = time();
        foreach ($kbRows as $kb) {
            $kbId = (int)$kb['id'];
            $cfg = $cfgMap[$kbId] ?? null;
            $enabled = $cfg ? (bool)$cfg['enabled'] : ((int)$kb['companyId'] === $companyId);
            if (!$enabled) {
                continue;
            }
            $isDefault = $cfg ? (bool)$cfg['isDefault'] : false;
            $list[] = [
                'id' => $kbId,
                'name' => (string)($kb['name'] ?: ''),
                'isDefault' => $isDefault,
            ];
            if ($isDefault) {
                $defaultKbId = $kbId;
            }
        }

        // 仍无默认：优先项目库首条，其次系统库
        if ($defaultKbId === null && !empty($list)) {
            $defaultKbId = (int)$list[0]['id'];
            $list[0]['isDefault'] = true;
        }

        // 懒同步写入分配表，便于后续 select 校验
        if (!empty($list)) {
            foreach ($list as $item) {
                $exist = Db::name('kb_touchkebao_config')
                    ->where('companyId', $companyId)
                    ->where('kefuId', 0)
                    ->where('kbId', $item['id'])
                    ->find();
                if ($exist) {
                    continue;
                }
                Db::name('kb_touchkebao_config')->insert([
                    'companyId' => $companyId,
                    'kbId' => $item['id'],
                    'kbName' => $item['name'],
                    'isDefault' => $item['isDefault'] ? 1 : 0,
                    'kefuId' => 0,
                    'currentKbId' => 0,
                    'enabled' => 1,
                    'updateTime' => $now,
                ]);
            }
        }

        return ['list' => $list, 'defaultKbId' => $defaultKbId];
    }
}