/*
 * Copyright 2023 CeresDB Project Authors. Licensed under Apache-2.0.
 */
package io.ceresdb;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;

import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.ceresdb.common.util.MetricsUtil;
import io.ceresdb.common.util.internal.ThrowUtil;
import io.ceresdb.models.Err;
import io.ceresdb.models.Point;
import io.ceresdb.models.Row;
import io.ceresdb.models.SqlQueryOk;
import io.ceresdb.models.SqlQueryRequest;
import io.ceresdb.models.Result;
import io.ceresdb.models.Value;
import io.ceresdb.models.WriteOk;
import io.ceresdb.models.WriteRequest;
import io.ceresdb.options.CeresDBOptions;
import io.ceresdb.rpc.RpcOptions;
import io.ceresdb.util.StreamWriteBuf;

public class CeresDBTest {

    private static final Logger LOG = LoggerFactory.getLogger(CeresDBTest.class);

    private String TEST_TABLE_NAME = "all_type_test_table_%d";

    private CeresDBOptions opts;
    private CeresDBClient  client;

    @Before
    public void before() throws Exception {
        final RpcOptions rpcOpts = RpcOptions.newDefault();
        rpcOpts.setBlockOnLimit(false);
        rpcOpts.setInitialLimit(32);
        rpcOpts.setLimitKind(RpcOptions.LimitKind.Gradient);
        rpcOpts.setLogOnLimitChange(true);
        this.opts = CeresDBOptions.newBuilder("127.0.0.1", 8831, RouteMode.DIRECT) //
                .database("public") //
                .rpcOptions(rpcOpts) //
                .writeMaxRetries(0) //
                .readMaxRetries(1) //
                .build();
        this.client = new CeresDBClient();
        final boolean ret = this.client.init(this.opts);

        TEST_TABLE_NAME = String.format(TEST_TABLE_NAME, System.currentTimeMillis());

        final Result<SqlQueryOk, Err> existsResult = this.client
                .sqlQuery(new SqlQueryRequest("EXISTS TABLE %s", TEST_TABLE_NAME)).get();
        if (!existsResult.isOk()) {
            LOG.error("EXISTS TABLE before fail: {}", existsResult.getErr());
            return;
        }
        LOG.info("EXISTS TABLE before: {}.", existsResult.getOk());

        final Result<SqlQueryOk, Err> createResult = this.client.sqlQuery(new SqlQueryRequest("CREATE TABLE %s(" + //
                                                                                              "ts TIMESTAMP NOT NULL," + //
                                                                                              "tString STRING TAG NOT NULL,"
                                                                                              + //
                                                                                              "tInt64 INT64 TAG NULL," + //
                                                                                              "fString STRING NULL," + //
                                                                                              "fBool BOOLEAN NULL," + //
                                                                                              "fDouble DOUBLE NULL," + //
                                                                                              "fFloat FLOAT NULL," + //
                                                                                              "fInt64 INT64 NULL," + //
                                                                                              "fInt32 INT32 NULL," + //
                                                                                              "fInt16 INT16 NULL," + //
                                                                                              "fInt8 INT8 NULL," + //
                                                                                              "fUint64 UINT64 NULL," + //
                                                                                              "fUint32 UINT32 NULL," + //
                                                                                              "fUint16 UINT16 NULL," + //
                                                                                              "fUint8 UINT8 NULL," + //
                                                                                              "fTimestamp TIMESTAMP NULL,"
                                                                                              + //
                                                                                                                             //"fVarbinary VARBINARY NULL, + //"
                                                                                              "TIMESTAMP KEY(ts)) ENGINE=Analytic WITH (ttl='7d')",
                TEST_TABLE_NAME)).get();
        if (!createResult.isOk()) {
            LOG.error("CREATE TABLE before fail, {}", createResult.getErr());
            return;
        }

        LOG.info("Start CeresDB client {}, with options: {}, create table {}: {}.", result(ret), this.opts,
                TEST_TABLE_NAME, createResult.getOk());

        final Result<SqlQueryOk, Err> existsResult2 = this.client
                .sqlQuery(new SqlQueryRequest("EXISTS TABLE %s", TEST_TABLE_NAME)).get();
        LOG.info("EXISTS TABLE after: {}.", existsResult2);
    }

    private static String result(final boolean result) {
        return result ? "success" : "failed";
    }

    @After
    public void after() throws Exception {
        final Result<SqlQueryOk, Err> dropResult = this.client
                .sqlQuery(new SqlQueryRequest("DROP TABLE %s", TEST_TABLE_NAME)).get();
        if (!dropResult.isOk()) {
            LOG.error("DROP TABLE after fail, {}", dropResult.getErr());
            return;
        }

        LOG.info("DROP TABLE: {}.", dropResult);
        MetricsUtil.reportImmediately();
        this.client.shutdownGracefully();
    }

    public CeresDBOptions getOpts() {
        return opts;
    }

    @Ignore
    @Test
    public void comprehensiveTest() throws ExecutionException, InterruptedException {
        final Calendar time = Calendar.getInstance();
        final SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ");
        final String timeString = format.format(time.getTime());
        System.out.println("time=" + timeString + " " + time.getTimeInMillis() + " " + time.getTime());

        final int writeCount = ThreadLocalRandom.current().nextInt(1, 10);

        final Result<WriteOk, Err> writeR = write(time, writeCount);

        LOG.info("#comprehensiveTest write result={}.", writeR);

        Assert.assertTrue(writeR.isOk());
        Assert.assertEquals(writeR.getOk().getSuccess(), writeCount);

        final SqlQueryRequest req = SqlQueryRequest.newBuilder() //
                .sql("select * from %s where ts < to_timestamp_millis('%s')", TEST_TABLE_NAME, timeString) //
                .build();

        final Result<SqlQueryOk, Err> queryR = this.client.sqlQuery(req).get();

        LOG.info("#comprehensiveTest query result={}.", queryR);

        Assert.assertTrue(queryR.isOk());

        final SqlQueryOk ok = queryR.getOk();

        ok.stream().forEach(row -> {
            LOG.info(
                    "======> Data: ts={}, tString={}, tInt64={}, fString={}, fBool={}, fDouble={}, fFloat={}, fInt64={}, fInt32={}, fInt16={},"
                     + //
            "fInt8={}, fUint64={}, fUint32={}, fUint16={}, fUint8={}, fTimestamp={}, fVarbinary={}", //
                    row.getColumn("ts").getValue().getTimestamp(), //
                    row.getColumn("tString").getValue().getString(), //
                    row.getColumn("tInt64").getValue().getInt64(), //
                    row.getColumn("fString").getValue().getString(), //
                    row.getColumn("fBool").getValue().getBoolean(), //
                    row.getColumn("fDouble").getValue().getDouble(), //
                    row.getColumn("fFloat").getValue().getFloat(), //
                    row.getColumn("fInt64").getValue().getInt64(), //
                    row.getColumn("fInt32").getValue().getInt32(), //
                    row.getColumn("fInt16").getValue().getInt16(), //
                    row.getColumn("fInt8").getValue().getInt8(), //
                    row.getColumn("fUint64").getValue().getUInt64(), //
                    row.getColumn("fUint32").getValue().getUInt32(), //
                    row.getColumn("fUint16").getValue().getUInt16(), //
                    row.getColumn("fUint8").getValue().getUInt8(), //
                    row.getColumn("fTimestamp").getValue().getTimestamp() //
            //row.getColumnValue("fVarbinary").getVarbinary())
            );
        });

        final Result<SqlQueryOk, Err> alterResult1 = this.client
                .sqlQuery(
                        new SqlQueryRequest("ALTER TABLE %s ADD COLUMN (c18 UINT64, c19 STRING TAG)", TEST_TABLE_NAME))
                .get();
        LOG.info("ALTER TABLE 1: {}.", alterResult1);

        final Result<SqlQueryOk, Err> alterResult2 = this.client
                .sqlQuery(new SqlQueryRequest("ALTER TABLE %s ADD COLUMN c20 STRING TAG", TEST_TABLE_NAME)).get();
        LOG.info("ALTER TABLE 2: {}.", alterResult2);

        final Result<SqlQueryOk, Err> descResult = this.client
                .sqlQuery(new SqlQueryRequest("DESCRIBE %s", TEST_TABLE_NAME)).get();
        LOG.info("DESCRIBE TABLE: {}.", descResult);

        final Result<SqlQueryOk, Err> showResult = this.client
                .sqlQuery(new SqlQueryRequest("SHOW CREATE TABLE %s", TEST_TABLE_NAME)).get();
        LOG.info("SHOW CREATE TABLE: {}.", showResult);

        final Result<SqlQueryOk, Err> queryResult = this.client
                .sqlQuery(new SqlQueryRequest("SELECT * FROM %s", TEST_TABLE_NAME)).get();
        LOG.info("QUERY TABLE: {}.", queryResult);
    }

    private Result<WriteOk, Err> write(final Calendar time, final int writeCount) {
        try {
            return writeAsync(time, writeCount).get();
        } catch (final Throwable t) {
            ThrowUtil.throwException(t);
        }
        return WriteOk.emptyOk().mapToResult();
    }

    private CompletableFuture<Result<WriteOk, Err>> writeAsync(final Calendar time, final int writeCount) {
        return this.client.write(new WriteRequest(makePoints(time, writeCount)));
    }

    private List<Point> makePoints(final Calendar time, final int count) {
        final long timestamp = time.getTimeInMillis();

        List<Point> points = new ArrayList<>(count);
        for (long ts = (timestamp - count); ts < timestamp; ts++) {
            Point point = Point.newPointBuilder(TEST_TABLE_NAME).setTimestamp(ts)
                    .addTag("tString", Value.withString("first_c1")).addTag("tInt64", Value.withInt64(12))
                    .addField("fString", Value.withString("string value")).addField("fBool", Value.withBoolean(true))
                    .addField("fDouble", Value.withDouble(0.64)).addField("fFloat", Value.withFloat(0.32f))
                    .addField("fInt64", Value.withInt64(-64)).addField("fInt32", Value.withInt32(-32))
                    .addField("fInt16", Value.withInt16(-16)).addField("fInt8", Value.withInt8(-8))
                    .addField("fUint64", Value.withUInt64(64)).addField("fUint32", Value.withUInt32(32))
                    .addField("fUint16", Value.withUInt16(16)).addField("fUint8", Value.withUInt8(8))
                    .addField("fTimestamp", Value.withTimestamp(time.getTimeInMillis()))
                    //.addField("fVarbinary", Value.withVarbinary("test".getBytes(StandardCharsets.UTF_8))
                    .build();
            points.add(point);
        }
        return points;
    }

    @Ignore
    @Test
    public void holdConnectionTest() throws ExecutionException, InterruptedException {
        comprehensiveTest();
        for (int i = 0; i < 1000; i++) {
            Thread.sleep(1000);
        }
    }

    @SuppressWarnings("all")
    @Ignore
    @Test
    public void loopToWriteTest() throws Exception {
        final int concurrence = 32;
        final List<CompletableFuture<Result<WriteOk, Err>>> fs = new ArrayList<>();
        for (;;) {
            try {
                for (int i = 0; i < concurrence; i++) {
                    fs.add(writeAsync(Calendar.getInstance(), 32));
                }

                for (final CompletableFuture<Result<WriteOk, Err>> f : fs) {
                    f.get();
                }
            } catch (final Exception e) {
                e.printStackTrace();
            } finally {
                fs.clear();
            }
        }
    }

    @Ignore
    @Test
    public void streamWriteTest() {
        final StreamWriteBuf<Point, WriteOk> writeBuf = this.client.streamWrite(TEST_TABLE_NAME);
        final CompletableFuture<WriteOk> future = writeBuf.write(makePoints(Calendar.getInstance(), 2)) //
                .write(makePoints(Calendar.getInstance(), 3)) //
                .flush() //
                .writeAndFlush(makePoints(Calendar.getInstance(), 10)) //
                .write(makePoints(Calendar.getInstance(), 10)) //
                .writeAndFlush(makePoints(Calendar.getInstance(), 10)) //
                .completed();

        Assert.assertEquals(35, future.join().getSuccess());
    }

    @Ignore
    @Test
    public void streamQueryTest() {
        final Calendar time = Calendar.getInstance();
        final StreamWriteBuf<Point, WriteOk> writeBuf = this.client.streamWrite(TEST_TABLE_NAME);
        for (int i = 0; i < 1000; i++) {
            time.add(Calendar.MILLISECOND, 1);
            writeBuf.writeAndFlush(makePoints(time, 1));
        }
        final CompletableFuture<WriteOk> writeOk = writeBuf.completed();
        Assert.assertEquals(1000, writeOk.join().getSuccess());

        final SqlQueryRequest req = SqlQueryRequest.newBuilder().sql("select * from %s", TEST_TABLE_NAME).build();
        final Iterator<Row> it = this.client.blockingStreamSqlQuery(req, 3, TimeUnit.SECONDS);

        int i = 0;
        while (it.hasNext()) {
            LOG.info("The {} row, timestamp={}", ++i, it.next().getColumn("ts"));
        }

        Assert.assertEquals(1000, i);
    }
}