// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#include <vector>
#include <map>
#include <gtest/gtest.h>
#include <string>

#include "common/logging.h"
#include "exec/es/es_scan_reader.h"
#include "exec/es/es_scroll_query.h"
#include "http/ev_http_server.h"
#include "http/http_channel.h"
#include "http/http_handler.h"
#include "http/http_request.h"
#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"

namespace doris {

class RestSearchAction : public HttpHandler {
public:
    void handle(HttpRequest* req) override {
        std::string user;
        std::string passwd;
        if (!parse_basic_auth(*req, &user, &passwd) || user != "root") {
            HttpChannel::send_basic_challenge(req, "abc");
            return;
        }
        req->add_output_header(HttpHeaders::CONTENT_TYPE, "application/json");
        if (req->method() == HttpMethod::POST) {
            std::string post_body = req->get_request_body();
            rapidjson::Document post_doc;
            post_doc.Parse<0>(post_body.c_str());
            int size = 1;
            if (post_doc.HasMember("size")) {
                rapidjson::Value& size_value = post_doc["size"];
                size = size_value.GetInt();
            }
            std::string _scroll_id(std::to_string(size));
            rapidjson::Document search_result;
            rapidjson::Document::AllocatorType &allocator = search_result.GetAllocator();
            search_result.SetObject();
            rapidjson::Value scroll_id_value(_scroll_id.c_str(), allocator);
            search_result.AddMember("_scroll_id", scroll_id_value, allocator);

            rapidjson::Value outer_hits(rapidjson::kObjectType);
            outer_hits.AddMember("total", 10, allocator);
            rapidjson::Value inner_hits(rapidjson::kArrayType);
            rapidjson::Value source_docuement(rapidjson::kObjectType);
            source_docuement.AddMember("id", 1, allocator);
            rapidjson::Value value_node("1", allocator);
            source_docuement.AddMember("value", value_node, allocator);
            inner_hits.PushBack(source_docuement, allocator);
            outer_hits.AddMember("hits", inner_hits, allocator);
            search_result.AddMember("hits", outer_hits, allocator);

            rapidjson::StringBuffer buffer;  
            rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
            search_result.Accept(writer);
            //send DELETE scorll post request
            std::string search_result_json = buffer.GetString();
            HttpChannel::send_reply(req, search_result_json);
        } else {
            std::string response = "test1";
            HttpChannel::send_reply(req, response);
        }
    }
};

class RestSearchScrollAction : public HttpHandler {
public:
    void handle(HttpRequest* req) override {
        std::string user;
        std::string passwd;
        if (!parse_basic_auth(*req, &user, &passwd) || user != "root") {
            HttpChannel::send_basic_challenge(req, "abc");
            return;
        }
        if (req->method() == HttpMethod::POST) {
            std::string post_body = req->get_request_body();
            rapidjson::Document post_doc;
            post_doc.Parse<0>(post_body.c_str());
            std::string scroll_id;
            if (!post_doc.HasMember("scroll_id")) {
                HttpChannel::send_reply(req,HttpStatus::NOT_FOUND, "invalid scroll request");
                return;
            } else {
                rapidjson::Value& scroll_id_value = post_doc["scroll_id"];
                scroll_id = scroll_id_value.GetString();
                int offset = atoi(scroll_id.c_str());
                if (offset > 10) {
                    rapidjson::Document end_search_result;
                    rapidjson::Document::AllocatorType &allocator = end_search_result.GetAllocator();
                    end_search_result.SetObject();
                    rapidjson::Value scroll_id_value("11", allocator);
                    end_search_result.AddMember("_scroll_id", scroll_id_value, allocator);

                    rapidjson::Value outer_hits(rapidjson::kObjectType);
                    outer_hits.AddMember("total", 0, allocator);
                    end_search_result.AddMember("hits", outer_hits, allocator);
                    rapidjson::StringBuffer buffer;  
                    rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
                    end_search_result.Accept(writer);
                    //send DELETE scorll post request
                    std::string end_search_result_json = buffer.GetString();
                    HttpChannel::send_reply(req, end_search_result_json);
                    return;
                } else {
                    int start = offset + 1;
                    rapidjson::Document search_result;
                    rapidjson::Document::AllocatorType &allocator = search_result.GetAllocator();
                    search_result.SetObject();
                    rapidjson::Value scroll_id_value(std::to_string(start).c_str(), allocator);
                    search_result.AddMember("_scroll_id", scroll_id_value, allocator);

                    rapidjson::Value outer_hits(rapidjson::kObjectType);
                    outer_hits.AddMember("total", 1, allocator);
                    rapidjson::Value inner_hits(rapidjson::kArrayType);
                    rapidjson::Value source_docuement(rapidjson::kObjectType);
                    source_docuement.AddMember("id", start, allocator);
                    rapidjson::Value value_node(std::to_string(start).c_str(), allocator);
                    source_docuement.AddMember("value", value_node, allocator);
                    inner_hits.PushBack(source_docuement, allocator);
                    outer_hits.AddMember("hits", inner_hits, allocator);
                    search_result.AddMember("hits", outer_hits, allocator);

                    rapidjson::StringBuffer buffer;  
                    rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
                    search_result.Accept(writer);
                    //send DELETE scorll post request
                    std::string search_result_json = buffer.GetString();
                    HttpChannel::send_reply(req, search_result_json);
                    return;
                }
                
            }
        } 
    }
};

class RestClearScrollAction : public HttpHandler {
public:
    void handle(HttpRequest* req) override {
        std::string user;
        std::string passwd;
        if (!parse_basic_auth(*req, &user, &passwd) || user != "root") {
            HttpChannel::send_basic_challenge(req, "abc");
            return;
        }
        if (req->method() == HttpMethod::DELETE) {
            std::string post_body = req->get_request_body();
            rapidjson::Document post_doc;
            post_doc.Parse<0>(post_body.c_str());
            std::string scroll_id;
            if (!post_doc.HasMember("scroll_id")) {
                HttpChannel::send_reply(req,HttpStatus::NOT_FOUND, "invalid scroll request");
                return;
            } else {
                rapidjson::Document clear_scroll_result;
                rapidjson::Document::AllocatorType &allocator = clear_scroll_result.GetAllocator();
                clear_scroll_result.SetObject();
                clear_scroll_result.AddMember("succeeded", true, allocator);
                clear_scroll_result.AddMember("num_freed", 1, allocator);
                rapidjson::StringBuffer buffer;  
                rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
                clear_scroll_result.Accept(writer);
                std::string clear_scroll_result_json = buffer.GetString();
                HttpChannel::send_reply(req, clear_scroll_result_json);
                return;
            } 
        }
    }
};

static RestSearchAction rest_search_action = RestSearchAction();
static RestSearchScrollAction rest_search_scroll_action = RestSearchScrollAction();
static RestClearScrollAction rest_clear_scroll_action = RestClearScrollAction();
static EvHttpServer* mock_es_server = nullptr;
static int real_port = 0;

class MockESServerTest : public testing::Test {
public:
    MockESServerTest() { }
    ~MockESServerTest() override { }

    static void SetUpTestCase() {
        mock_es_server = new EvHttpServer(0);
        mock_es_server->register_handler(POST, "/{index}/{type}/_search", &rest_search_action);        
        mock_es_server->register_handler(POST, "/_search/scroll", &rest_search_scroll_action);
        mock_es_server->register_handler(DELETE, "/_search/scroll", &rest_clear_scroll_action);
        mock_es_server->start();
        real_port = mock_es_server->get_real_port();
        ASSERT_NE(0, real_port);
    }

    static void TearDownTestCase() {
        delete mock_es_server;
    }
};

TEST_F(MockESServerTest, workflow) {
    std::string target = "http://127.0.0.1:" + std::to_string(real_port);
    std::vector<std::string> fields = {"id", "value"};
    std::map<std::string, std::string> props;
    props[ESScanReader::KEY_INDEX] = "tindex";
    props[ESScanReader::KEY_TYPE] = "doc";
    props[ESScanReader::KEY_USER_NAME] = "root";
    props[ESScanReader::KEY_PASS_WORD] = "root";
    props[ESScanReader::KEY_SHARD] = "0";
    props[ESScanReader::KEY_BATCH_SIZE] = "1";
    std::vector<EsPredicate*> predicates;
    std::map<std::string, std::string> docvalue_context;
    props[ESScanReader::KEY_QUERY] = ESScrollQueryBuilder::build(props, fields, predicates, docvalue_context);
    ESScanReader reader(target, props);
    auto st = reader.open();
    ASSERT_TRUE(st.ok());
    bool eos = false;
    std::unique_ptr<ScrollParser> parser = nullptr;
    while(!eos){
        st = reader.get_next(&eos, parser);
        ASSERT_TRUE(st.ok());
        if(eos) {
            break;
        }
    }
    auto cst = reader.close();
    ASSERT_TRUE(cst.ok());
}
}

int main(int argc, char* argv[]) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}