<?php
namespace app\common\library\elasticsearch;

use Elastic\Elasticsearch\ClientBuilder;
use think\Exception;

class Client
{
    public $client;

    const ES_HOST_NAME = '114.55.95.135:9200';


    private static  $instance;

    /**
     * @var 索引名称
     */
    protected $index;


    public $alias;

    protected $retries = 2;

    /**
     * 查询参数
     * @var array $queryParams
     */
    protected $queryParams = [];

    private $debug;

    public function __construct()
    {
        $this->client = ClientBuilder::create()->setHosts([self::ES_HOST_NAME])->build();
    }


    private function __clone() {

    }

    public static function getInstance(){
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * 查询条件
     * @param $params
     * @return $this
     */
    public function select($params = '')
    {
        $this->queryParams['select'] = str_replace(' ', '', trim($params, " ,\t\r\n"));
        return $this;
    }

    /**
     * 分页
     * @param $number
     * @return $this
     */
    public function from($number = 0)
    {
        $this->queryParams['from'] = $number ? ($number-1)*10 : 0;
        return $this;
    }

    /**
     * 页码
     * @param $number
     * @return $this
     */
    public function size($number = 10)
    {
        $this->queryParams['size'] = $number;
        return $this;
    }

    public function equal($params = [])
    {
        $this->queryParams['equal'][] = $params;
        return $this;
    }

    public function in($params = [])
    {
        $this->queryParams['in'][] = $params;
        return $this;
    }

    public function like($params = [])
    {
        $this->queryParams['like'][] = $params;
        return $this;
    }

    public function orlike($params = [])
    {
        $this->queryParams['orlike'][] = $params;
        return $this;
    }

    public function order($params = [])
    {
        $this->queryParams['order'][] = $params;
        return $this;
    }

    /**
     * 根据条件删除文档
     * @param array $params
     * @return array
     */

    public function deleteDoc($params = [])
    {
        return $this->client->deleteByQuery($params);
    }


    public function existsIndex(String $index_name) {
        $params = [
            'index' => $index_name
        ];
        return $this->client->indices()->exists($params);
    }

    /**
     * 创建索引
     */
    public function createIndex(String $index_name, array $mapping = []): array
    {
        if ($this->existsIndex($index_name)) {
            throw new Exception('索引已存在'. $index_name);
        }

        //只能创建一次
        $params = [
            'index' => $index_name,
            'body' => [
                'settings' => [
                    'number_of_shards' => 5,
                    'number_of_replicas' => 1
                ],
                'mappings' => $mapping
            ]
        ];
        return $this->client->indices()->create($params);
    }

    /**
     * 删除索引
     */
    public function deleteIndex(String $index_name = ''): array{
        $params = ['index' => $index_name];
        return $this->client->indices()->delete($params);
    }

    /**
     * 根据id删除文档
     * @param int $id
     * @return array
     */
    public function deleteDocById($id = 0)
    {
        $params = [
            'index' => $this->index,
            'id' => $id
        ];
        $response = $this->client->delete($params);
        return $response;
    }

    /**
     * 组装查询条件
     * @param array $params
     * @return $this
     */
    private function parseQueryParams()
    {
        $queryParams = [
            'index' => $this->index,
            'body' => [
                'query' => [
                    'bool' => [
                        'must' => [],
                        'filter' => []
                    ]
                ],

            ],
            'from' => $this->queryParams['from'] ?? 0,
            'size' => $this->queryParams['size'] ?? 10

        ];

        $filter = $must = [];
        if (!empty($this->queryParams['select'])) {
            $queryParams['_source'] = explode(',', $this->queryParams['select']);
        }

        if (!empty($this->queryParams['equal'])) {
            foreach ($this->queryParams['equal'] as $key => $row) {
                foreach ($row as $filed => $value) {
                    $filter[] = [
                        'term' => [$filed => $value]
                    ];
                }
            }
        }

        if (!empty($this->queryParams['in'])) {
            foreach ($this->queryParams['in'] as $key => $row) {
                foreach ($row as $filed => $value) {
                    $filter[] = [
                        'terms' => [$filed => array_values(array_unique(array_filter($value)))]
                    ];
                }
            }
        }

        if (!empty($this->queryParams['like'])) {
            foreach ($this->queryParams['like'] as $key => $row) {
                foreach ($row as $filed => $value) {
                    /*$must[] = [

                        'wildcard' => [$filed => '*'. $value. '*']

                    ];*/
                    $must[] = [
                        'match' => [$filed => $value]
//                        'match_phrase' => [$filed => $value]
                    ];
                }
            }

            $queryParams['body']['query']['bool']['must'] = $must;

        }

        if (!empty($this->queryParams['orlike'])) {
            foreach ($this->queryParams['orlike'] as $key => $row) {
                foreach ($row as $filed => $value) {
                    $orlike[] = [
                        'match_phrase' => [$filed => $value]
                    ];
                }
            }

            $queryParams['body']['query']['bool']['must']['bool']['should'] = $orlike;
        }

        if (!empty($this->queryParams['order'])) {
            foreach ($this->queryParams['order'] as $key => $row) {
                $queryParams['body']['sort'][] = [
                    key($row) => [
                        'order' => current($row)
                    ]
                ];
            }
        }

        $queryParams['body']['query']['bool']['filter'] = $filter;

        $this->queryParams = $queryParams;

        return $this;

    }


    /**
     * @param bool $isTotal isTotal=true时, 返回总数
     * @return array|string
     */

    public function query($isTotal = false)
    {
        try {
            $this->parseQueryParams();

//            dd($this->queryParams);

            if ($this->debug) {
                return \GuzzleHttp\json_encode($this->queryParams);
            }

            if ($isTotal === true) {

                unset(

                    $this->queryParams['from'],

                    $this->queryParams['size'],

                    $this->queryParams['_source']

                );

                $count = $this->client->count($this->queryParams);

                return (int)$count['count'];

            }

            if (!empty($this->queryParams)) {

                $result = $this->client->search($this->queryParams);


                if (!empty($result['hits']['hits'])) {

                    $return = [];

                    foreach ($result['hits']['hits'] as $row) {

                        $return[] = $row['_source'];

                    }

                    return $return;

                } else {

                    return [];

                }

            }

        } catch (\Exception $e) {

            $msg = $e->getMessage();

            $msg = '服务器开小差了~';

            throw new Exception($msg);

        }
    }

    /**
     * 添加文档
     * @param $id
     * @param $doc ['id'=>100, 'title'=>'phone']
     * @param string $index_name
     * @param string $type_name
     */
    public function addDoc($id, $doc, string $type_name = '_doc')
    {
        $params = [
            'index' => $this->index,
            'type' => $type_name,
            'id' => $id,
            'body' => $doc
        ];

        return $this->client->index($params);
    }

    public function getIndex()
    {
        return $this->index;
    }

    /**
     * 返回ES实例
     */

    public static function setEs($index = '')
    {
        $class = get_called_class();
        if (!self::$instance || !self::$instance instanceof $class) {
            self::$instance = new static();
        }
        if ($index) {
            self::$instance->index = $index;
        }
        return self::$instance;

    }

    protected function settings()
    {
        return [
            'number_of_shards' => 1,
            'number_of_replicas' => 0
        ];
    }

    /**
     * 判断文档存在
     * @param int $id
     * @param string $type_name
     * @return bool
     */
    public function existsDoc(int $id = 1, string $type_name = '_doc'): bool
    {
        $params = [
            'index' => $this->index,
            'type' => $type_name,
            'id' => $id
        ];

        return $this->client->exists($params);

    }

    /**
     * 获取文档
     * @param int $id
     * @param string $index_name
     * @param string $type_name
     * @return array
     */
    public function getDoc(int $id = 1, string $type_name = '_doc'): array
    {
        $params = [
            'index' => $this->index,
            'type' => $type_name,
            'id' => $id
        ];

        return $this->client->get($params);
    }

    /**
     * 更新文档
     * @param int $id
     * @param string $index_name
     * @param string $type_name
     * @param array $body
     * @return array
     */
    public function updateDoc(int $id = 1, array $body = [], string $type_name = '_doc'): array
    {
        //  可以灵活添加新字段，最好不要乱添加
        $params = [
            'index' => $this->index,
            'type' => $type_name,
            'id' => $id,
            'body' => $body
        ];

        return $this->client->update($params);
    }


    /**
     * 搜索文档：分页，排序，权重，过滤
     * @param string $index_name
     * @param string $type_name
     * @param array $body
     * @return array
     */
    public function searchDoc(array $body = [],  string $type_name = "_doc"): array
    {
        $params = [
            'index' => $this->index,
            'type' => $type_name,
            'body' => $body
        ];

        return $this->client->search($params);
    }

    /**

     * @return bool

     * @throws Exception

     */

    public function createIndexNew($mapping)
    {
        try {
            $params = [
                'index' => $this->index
            ];

            $check = $this->indices()->exists($params);

//            if ($check) {
//                throw new Exception('index: ' . $this->index . ' already exists');
//            }

            $params = [
                'index' => $this->index,
                'body' => [
                    'settings' => $this->settings(),
                    'mappings' => [
                        '_source' => [
                            'enabled' => true,
                        ],
                        'properties' => $mapping
                    ]
                ]
            ];

            $result = $this->indices()->create($params);

            return $result['acknowledged'] === true;

        } catch (\Exception $e) {

            throw new Exception($e->getMessage());

        }

    }

    /**

     * 删除索引

     *

     * @return bool

     * @throws Missing404Exception

     */

    public function deleteIndexNew()
    {

        try {

            $params = [

                'index' => $this->index

            ];

            $check = $this->indices()->exists($params);

            if (!$check) {

                return true;

            }

            $result = $this->indices()->delete([

                'index' => $this->index

            ]);

            return $result['acknowledged'] === true;

        } catch (Missing404Exception $e) {

            throw new Missing404Exception('no such index ' . $this->index);

        }

    }

    /**

     * 批量写入

     * type 1.增加/修改 2.删除

     * $data = [

     *      ['id' => 1, 'name' => 'llf', 'age' => 30],

     *      ['id' => 1, 'name' => 'llf', 'age' => 30],

     *      ['id' => 1, 'name' => 'llf', 'age' => 30],

     *      ['id' => 1, 'name' => 'llf', 'age' => 30],

     * ];

     * @param array $data

     */

    public function doBulkDocument($type = 1,$data = [])

    {

        try {

            $params = ['body' => []];

            if($type == 1){

                foreach ($data as $key => $row) {

                    $params['body'][] = [

                        'index' => [

                            '_index' => $this->index,

                            '_id' => $row['info_id'].'-'.$row['info_type']

                        ]

                    ];

                    $params['body'][] = $row;

                    if (($key+1)%10000 == 0) {

                        $this->client->bulk($params);

                        $params = ['body' => []];

                    }

                }

            }else{

                foreach ($data as $key => $row) {

                    $params['body'][] = [

                        'delete' => [

                            '_index' => $this->index,

                            '_id' => $row['info_id'].'-'.$row['info_type']

                        ]

                    ];

                }

            }

            if (!empty($params['body'])) {

                $this->client->bulk($params);

                return true;

            }

        } catch (\Exception $e) {

            throw new Exception($e->getMessage());

        }

    }

    /**
     * 更新索引
     * @return array @todo

     */

    public function updateIndex($mappings)

    {

        $putParams = [

            'index' => $this->index,

            //'type' => '_doc',

            'body' => [

                'properties' => $mappings

            ]

        ];

        return $this->indices()->putMapping($putParams);

    }

    /**

     * 方便调试, 直接返回拼接的query

     * @return $this

     */

    public function setDebug()

    {

        $this->debug = true;

        return $this;

    }

    private function indices()

    {

        return $this->client->indices();

    }

    public function analyze($text = '')

    {

        $params = [

            'index' => $this->index,

            'body' => [

                'analyzer' => 'ik_smart',

                'text' => $text

            ]

        ];

        return $this->indices()->analyze($params);

    }

    public function update($id = 0, $updateParams = [])

    {

        $params = [

            'index' => $this->index,

            'id' => $id,

            'body' => [

                'doc' => $updateParams

            ]

        ];

        return $this->client->update($params);
    }
}