/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *     Copyright 2012 Couchbase, Inc.
 *
 *   Licensed 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 "config.h"
#include <gtest/gtest.h>
#include <libcouchbase/couchbase.h>
#include <libcouchbase/api3.h>
#include <mocksupport/server.h>
#include "mock-environment.h"
#include <sstream>

MockEnvironment *MockEnvironment::instance;

MockEnvironment *MockEnvironment::getInstance(void)
{
    if (instance == NULL) {
        instance = new MockEnvironment;
    }
    return instance;
}

void MockEnvironment::Reset()
{
    if (instance != NULL) {
        instance->TearDown();
        instance->SetUp();
    }
}

void MockEnvironment::init()
{
    mock = NULL;
    http = NULL;
    innerClient = NULL;
    argv = NULL;
    iops = NULL;

    numNodes = 4;
    realCluster = false;
    serverVersion = VERSION_UNKNOWN;
}

MockEnvironment::MockEnvironment()
{
    init();
}

MockEnvironment::MockEnvironment(const char **args, std::string bucketname)
{
    init();
    this->argv = args;
    this->bucketName = bucketname;
    SetUp();
}

void MockEnvironment::failoverNode(int index, std::string bucket)
{
    MockBucketCommand bCmd(MockCommand::FAILOVER, index, bucket);
    sendCommand(bCmd);
    getResponse();
}

void MockEnvironment::respawnNode(int index, std::string bucket)
{
    MockBucketCommand bCmd(MockCommand::RESPAWN, index, bucket);
    sendCommand(bCmd);
    getResponse();
}

void MockEnvironment::hiccupNodes(int msecs, int offset)
{
    MockCommand cmd(MockCommand::HICCUP);
    cmd.set("msecs", msecs);
    cmd.set("offset", offset);
    sendCommand(cmd);
    getResponse();
}

void MockEnvironment::regenVbCoords(std::string bucket) {
    MockBucketCommand bCmd(MockCommand::REGEN_VBCOORDS, 0, bucket);
    MockResponse r;
    sendCommand(bCmd);
    getResponse(r);
    EXPECT_TRUE(r.isOk());
}

std::vector<int> MockEnvironment::getMcPorts(std::string bucket)
{
    MockCommand cmd(MockCommand::GET_MCPORTS);
    if (!bucket.empty()) {
        cmd.set("bucket", bucket);
    }

    sendCommand(cmd);
    MockResponse resp;
    getResponse(resp);
    EXPECT_TRUE(resp.isOk());
    const Json::Value& payload = resp.constResp()["payload"];

    std::vector<int> ret;

    for (int ii = 0; ii < (int)payload.size(); ii++) {
        ret.push_back(payload[ii].asInt());
    }
    return ret;
}

void MockEnvironment::setCCCP(bool enabled, std::string bucket,
                              const std::vector<int>* nodes)
{
    MockCommand cmd(MockCommand::SET_CCCP);
    cmd.set("enabled", enabled);

    if (!bucket.empty()) {
        cmd.set("bucket", bucket);
    }

    if (nodes != NULL) {
        const std::vector<int>& v = *nodes;
        Json::Value array(Json::arrayValue);

        for (std::vector<int>::const_iterator ii = v.begin(); ii != v.end(); ii++) {
            array.append(*ii);
        }

        cmd.set("servers", array);
    }

    sendCommand(cmd);
    getResponse();
}

void MockEnvironment::setEnhancedErrors(bool enabled, std::string bucket,
                                        const std::vector<int>* nodes)
{
    MockCommand cmd(MockCommand::SET_ENHANCED_ERRORS);
    cmd.set("enabled", enabled);

    if (!bucket.empty()) {
        cmd.set("bucket", bucket);
    }

    if (nodes != NULL) {
        const std::vector<int>& v = *nodes;
        Json::Value array(Json::arrayValue);

        for (std::vector<int>::const_iterator ii = v.begin(); ii != v.end(); ii++) {
            array.append(*ii);
        }

        cmd.set("servers", array);
    }

    sendCommand(cmd);
    getResponse();
}

void MockEnvironment::sendCommand(MockCommand &cmd)
{
    std::string s = cmd.encode();
    lcb_ssize_t nw = send(mock->client, s.c_str(), (unsigned long)s.size(), 0);
    assert(nw == s.size());
}

void MockEnvironment::getResponse(MockResponse& ret)
{
    std::string rbuf;
    do {
        char c;
        int rv = recv(mock->client, &c, 1, 0);
        assert(rv == 1);
        if (c == '\n') {
            break;
        }
        rbuf += c;
    } while (true);

    ret.assign(rbuf);
    if (!ret.isOk()) {
        std::cerr << "Mock command failed!" << std::endl;
        std::cerr << ret.constResp()["error"].asString() << std::endl;
        std::cerr << ret;
    }
}

void MockEnvironment::postCreate(lcb_t instance)
{
    lcb_error_t err;
    if (!isRealCluster()) {
        lcb_HTCONFIG_URLTYPE urltype = LCB_HTCONFIG_URLTYPE_COMPAT;
        err = lcb_cntl(instance, LCB_CNTL_SET, LCB_CNTL_HTCONFIG_URLTYPE, &urltype);
        ASSERT_EQ(LCB_SUCCESS, err);
    }
    err = lcb_cntl_string(instance, "fetch_mutation_tokens", "true");
    ASSERT_EQ(LCB_SUCCESS, err);
}

void
MockEnvironment::createConnection(HandleWrap &handle,
    lcb_t& instance, const lcb_create_st &user_options)
{
    lcb_io_opt_t io;
    lcb_create_st options;
    memcpy(&options, &user_options, sizeof user_options);

    if (lcb_create_io_ops(&io, NULL) != LCB_SUCCESS) {
        fprintf(stderr, "Failed to create IO instance\n");
        exit(1);
    }

    options.v.v2.io = io;
    lcb_error_t err = lcb_create(&instance, &options);
    ASSERT_EQ(LCB_SUCCESS, err);
    postCreate(instance);

    (void)lcb_set_cookie(instance, io);

    handle.instance = instance;
    handle.iops = io;
}

void MockEnvironment::createConnection(HandleWrap &handle, lcb_t &instance)
{
    lcb_create_st options;
    makeConnectParams(options, NULL);
    createConnection(handle, instance, options);
}

void MockEnvironment::createConnection(lcb_t &instance)
{
    HandleWrap handle;
    createConnection(handle, instance);

    handle.iops->v.base.need_cleanup = 1;
    handle.instance = NULL;
    handle.iops = NULL;

}

#define STAT_EP_VERSION "ep_version"

extern "C" {
    static void statsCallback(lcb_t, const void *cookie,
                              lcb_error_t err,
                              const lcb_server_stat_resp_t *resp)
    {
        MockEnvironment *me = (MockEnvironment *)cookie;
        ASSERT_EQ(LCB_SUCCESS, err);

        if (resp->v.v0.server_endpoint == NULL) {
            return;
        }

        if (!resp->v.v0.nkey) {
            return;
        }

        if (resp->v.v0.nkey != sizeof(STAT_EP_VERSION) - 1  ||
                memcmp(resp->v.v0.key, STAT_EP_VERSION,
                       sizeof(STAT_EP_VERSION) - 1) != 0) {
            return;
        }
        int version = ((const char *)resp->v.v0.bytes)[0] - '0';
        if (version == 1) {
            me->setServerVersion(MockEnvironment::VERSION_10);
        } else if (version == 2) {
            me->setServerVersion(MockEnvironment::VERSION_20);

        } else {
            std::cerr << "Unable to determine version from string '";
            std::cerr.write((const char *)resp->v.v0.bytes,
                            resp->v.v0.nbytes);
            std::cerr << "' assuming 1.x" << std::endl;

            me->setServerVersion(MockEnvironment::VERSION_10);
        }
    }
}

void MockEnvironment::bootstrapRealCluster()
{
    serverParams = ServerParams(mock->http, mock->bucket,
                                mock->username, mock->password);

    lcb_t tmphandle;
    lcb_error_t err;
    lcb_create_st options;
    serverParams.makeConnectParams(options, NULL);

    ASSERT_EQ(LCB_SUCCESS, lcb_create(&tmphandle, &options));
    postCreate(tmphandle);
    ASSERT_EQ(LCB_SUCCESS, lcb_connect(tmphandle));
    lcb_wait(tmphandle);

    lcb_set_stat_callback(tmphandle, statsCallback);
    lcb_server_stats_cmd_t scmd, *pscmd;
    pscmd = &scmd;
    err = lcb_server_stats(tmphandle, this, 1, &pscmd);
    ASSERT_EQ(LCB_SUCCESS, err);
    lcb_wait(tmphandle);

    const char *const *servers = lcb_get_server_list(tmphandle);
    int ii;
    for (ii = 0; servers[ii] != NULL; ii++) {
        // no body
    }

    if (serverVersion == VERSION_20) {
        // Couchbase 2.0.x
        featureRegistry.insert("observe");
        featureRegistry.insert("views");
        featureRegistry.insert("http");
        featureRegistry.insert("replica_read");
        featureRegistry.insert("lock");
    }

    numNodes = ii;
    lcb_destroy(tmphandle);
}

extern "C" {
static void mock_flush_callback(lcb_t, int, const lcb_RESPBASE *resp) {
    assert(resp->rc == LCB_SUCCESS);
}
}

void MockEnvironment::clearAndReset()
{
    if (is_using_real_cluster()) {
        return;
    }

    for (int ii = 0; ii < getNumNodes(); ii++) {
        respawnNode(ii, bucketName);
    }

    std::vector<int> mcPorts = getMcPorts(bucketName);
    serverParams.setMcPorts(mcPorts);
    setCCCP(true, bucketName);

    if (this != getInstance()) {
        return;
    }

    if (!innerClient) {
        lcb_create_st crParams;
        lcb_config_transport_t transports[] = {
                LCB_CONFIG_TRANSPORT_CCCP,
                LCB_CONFIG_TRANSPORT_LIST_END
        };
        memset(&crParams, 0, sizeof(crParams));
        // Use default I/O here..
        serverParams.makeConnectParams(crParams, NULL);
        crParams.v.v2.transports = transports;
        lcb_error_t err = lcb_create(&innerClient, &crParams);
        if (err != LCB_SUCCESS) {
            printf("Error on create: 0x%x\n", err);
        }
        EXPECT_FALSE(NULL == innerClient);
        postCreate(innerClient);
        err = lcb_connect(innerClient);
        EXPECT_EQ(LCB_SUCCESS, err);
        lcb_wait(innerClient);
        lcb_install_callback3(innerClient, LCB_CALLBACK_CBFLUSH, mock_flush_callback);
    }

    lcb_CMDCBFLUSH fcmd = { 0 };
    lcb_error_t err;

    err = lcb_cbflush3(innerClient, NULL, &fcmd);
    ASSERT_EQ(LCB_SUCCESS, err);
    lcb_wait(innerClient);
}

void MockEnvironment::SetUp()
{
    numNodes = 4;
    if (!mock) {
        mock = (struct test_server_info *)start_test_server((char **)argv);
    }

    realCluster = is_using_real_cluster() != 0;
    ASSERT_NE((const void *)(NULL), mock);
    http = get_mock_http_server(mock);
    ASSERT_NE((const char *)(NULL), http);

    if (realCluster) {
        bootstrapRealCluster();
        return;
    }

    if (bucketName.empty()) {
        const char *name = getenv("LCB_TEST_BUCKET");
        if (name != NULL) {
            bucketName = name;
        } else {
            bucketName = "default";
        }
    }
    serverParams = ServerParams(http,
                                bucketName.c_str(),
                                userName.c_str(),
                                NULL);

    // Mock 0.6
    featureRegistry.insert("observe");
    featureRegistry.insert("views");
    featureRegistry.insert("replica_read");
    featureRegistry.insert("lock");

    clearAndReset();
}

void MockEnvironment::TearDown()
{

}

MockEnvironment::~MockEnvironment()
{
    shutdown_mock_server(mock);
    mock = NULL;
    if (innerClient != NULL) {
        lcb_destroy(innerClient);
        innerClient = NULL;
    }
}

void HandleWrap::destroy()
{
    if (instance) {
        lcb_destroy(instance);
    }
    if (iops) {
        lcb_destroy_io_ops(iops);
    }

    instance = NULL;
    iops = NULL;
}

HandleWrap::~HandleWrap()
{
    destroy();
}

MockCommand::MockCommand(Code code)
{
    this->code = code;
    name = GetName(code);
    command["command"] = name;
    payload = &(command["payload"] = Json::Value(Json::objectValue));
}

MockCommand::~MockCommand()
{
}

std::string MockCommand::encode()
{
    finalizePayload();
    return Json::FastWriter().write(command);
}

void MockKeyCommand::finalizePayload()
{
    MockCommand::finalizePayload();
    if (vbucket != -1) {
        set("vBucket", vbucket);
    }

    if (!bucket.empty()) {
        set("Bucket", bucket);
    }
    set("Key", key);
}

void MockMutationCommand::finalizePayload()
{
    MockKeyCommand::finalizePayload();
    set("OnMaster", onMaster);

    if (!replicaList.empty()) {
        Json::Value arr(Json::arrayValue);
        Json::Value& arrval = (*payload)["OnReplicas"] = Json::Value(Json::arrayValue);
        for (std::vector<int>::iterator ii = replicaList.begin();
                ii != replicaList.end(); ii++) {
            arrval.append(*ii);
        }
    } else {
        set("OnReplicas", replicaCount);
    }

    if (cas != 0) {
        if (cas > (1LU << 30)) {
            fprintf(stderr, "Detected incompatible > 31 bit integer\n");
            abort();
        }
        set("CAS", static_cast<Json::UInt64>(cas));
    }

    if (!value.empty()) {
        set("Value", value);
    }
}

void MockBucketCommand::finalizePayload()
{
    MockCommand::finalizePayload();
    set("idx", ix);
    set("bucket", bucket);
}

void MockResponse::assign(const std::string &resp)
{
    bool rv = Json::Reader().parse(resp, jresp);
    assert(rv);
}

MockResponse::~MockResponse()
{
}

std::ostream& operator<<(std::ostream& os, const MockResponse& resp)
{
    os << Json::FastWriter().write(resp.jresp) << std::endl;
    return os;
}

bool MockResponse::isOk()
{
    const Json::Value& status = static_cast<const Json::Value&>(jresp)["status"];
    if (!status.isString()) {
        return false;
    }
    return tolower(status.asString()[0]) == 'o';
}