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package sqlancer.postgres.test;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

import java.util.stream.Collectors;

import sqlancer.IgnoreMeException;

import sqlancer.Main.StateLogger;

import sqlancer.MainOptions;

import sqlancer.Query;

import sqlancer.QueryAdapter;

import sqlancer.Randomly;

import sqlancer.StateToReproduce.PostgresStateToReproduce;

import sqlancer.TestOracle;

import sqlancer.postgres.PostgresCompoundDataType;

import sqlancer.postgres.PostgresGlobalState;

import sqlancer.postgres.PostgresSchema;

import sqlancer.postgres.PostgresSchema.PostgresColumn;

import sqlancer.postgres.PostgresSchema.PostgresDataType;

import sqlancer.postgres.PostgresSchema.PostgresTable;

import sqlancer.postgres.PostgresSchema.PostgresTables;

import sqlancer.postgres.PostgresVisitor;

import sqlancer.postgres.ast.PostgresCastOperation;

import sqlancer.postgres.ast.PostgresColumnValue;

import sqlancer.postgres.ast.PostgresExpression;

import sqlancer.postgres.ast.PostgresJoin;

import sqlancer.postgres.ast.PostgresJoin.PostgresJoinType;

import sqlancer.postgres.ast.PostgresPostfixText;

import sqlancer.postgres.ast.PostgresSelect;

import sqlancer.postgres.ast.PostgresSelect.PostgresFromTable;

import sqlancer.postgres.ast.PostgresSelect.SelectType;

import sqlancer.postgres.gen.PostgresCommon;

import sqlancer.postgres.gen.PostgresExpressionGenerator;

public class PostgresNoRECOracle implements TestOracle {

private PostgresSchema s;

private Connection con;

private PostgresStateToReproduce state;

private String firstQueryString;

private String secondQueryString;

private StateLogger logger;

private MainOptions options;

private final Set<String> errors = new HashSet<>();

private PostgresGlobalState globalState;

public PostgresNoRECOracle(PostgresGlobalState globalState) {

this.s = globalState.getSchema();

this.con = globalState.getConnection();

this.state = (PostgresStateToReproduce) globalState.getState();

this.logger = globalState.getLogger();

this.options = globalState.getOptions();

this.globalState = globalState;

}

@Override

public void check() throws SQLException {

PostgresCommon.addCommonExpressionErrors(errors);

PostgresCommon.addCommonFetchErrors(errors);

PostgresTables randomTables = s.getRandomTableNonEmptyTables();

List<PostgresColumn> columns = randomTables.getColumns();

PostgresExpression randomWhereCondition = getRandomWhereCondition(columns);

List<PostgresTable> tables = randomTables.getTables();

List<PostgresJoin> joinStatements = getJoinStatements(globalState, columns, tables);

List<PostgresExpression> fromTables = tables.stream().map(t -> new PostgresFromTable(t, Randomly.getBoolean()))

.collect(Collectors.toList());

int secondCount = getSecondQuery(fromTables, randomWhereCondition, joinStatements);

int firstCount = getFirstQueryCount(con, fromTables, columns, randomWhereCondition, joinStatements);

if (firstCount == -1 || secondCount == -1) {

throw new IgnoreMeException();

}

if (firstCount != secondCount) {

state.queryString = firstCount + " " + secondCount + " " + firstQueryString + ";\n" + secondQueryString

+ ";";

throw new AssertionError(firstQueryString + secondQueryString + firstCount + " " + secondCount);

}

}

public static List<PostgresJoin> getJoinStatements(PostgresGlobalState globalState, List<PostgresColumn> columns,

List<PostgresTable> tables) {

List<PostgresJoin> joinStatements = new ArrayList<>();

PostgresExpressionGenerator gen = new PostgresExpressionGenerator(globalState).setColumns(columns);

for (int i = 1; i < tables.size(); i++) {

PostgresExpression joinClause = gen.generateExpression(PostgresDataType.BOOLEAN);

PostgresTable table = Randomly.fromList(tables);

tables.remove(table);

PostgresJoinType options = PostgresJoinType.getRandom();

PostgresJoin j = new PostgresJoin(table, joinClause, options);

joinStatements.add(j);

}

return joinStatements;

}

private PostgresExpression getRandomWhereCondition(List<PostgresColumn> columns) {

return new PostgresExpressionGenerator(globalState).setColumns(columns).setGlobalState(globalState)

.generateExpression(PostgresDataType.BOOLEAN);

}

private int getSecondQuery(List<PostgresExpression> fromTables, PostgresExpression randomWhereCondition,

List<PostgresJoin> joinStatements) throws SQLException {

PostgresSelect select = new PostgresSelect();

// select.setGroupByClause(groupBys);

// PostgresExpression isTrue =

// PostgresPostfixOperation.create(randomWhereCondition,

// PostfixOperator.IS_TRUE);

PostgresCastOperation isTrue = new PostgresCastOperation(randomWhereCondition,

PostgresCompoundDataType.create(PostgresDataType.INT));

PostgresPostfixText asText = new PostgresPostfixText(isTrue, " as count", null, PostgresDataType.INT);

select.setFetchColumns(Arrays.asList(asText));

select.setFromList(fromTables);

select.setSelectType(SelectType.ALL);

select.setJoinClauses(joinStatements);

int secondCount = 0;

secondQueryString = "SELECT SUM(count) FROM (" + PostgresVisitor.asString(select) + ") as res";

if (options.logEachSelect()) {

logger.writeCurrent(secondQueryString);

}

errors.add("canceling statement due to statement timeout");

Query q = new QueryAdapter(secondQueryString, errors);

ResultSet rs;

try {

rs = q.executeAndGet(con);

} catch (Exception e) {

throw new AssertionError(secondQueryString, e);

}

if (rs == null) {

return -1;

}

if (rs.next()) {

secondCount += rs.getLong(1);

}

rs.close();

return secondCount;

}

private int getFirstQueryCount(Connection con, List<PostgresExpression> randomTables, List<PostgresColumn> columns,

PostgresExpression randomWhereCondition, List<PostgresJoin> joinStatements) throws SQLException {

PostgresSelect select = new PostgresSelect();

// select.setGroupByClause(groupBys);

// PostgresAggregate aggr = new PostgresAggregate(

PostgresColumnValue allColumns = new PostgresColumnValue(Randomly.fromList(columns), null);

// PostgresAggregateFunction.COUNT);

// select.setFetchColumns(Arrays.asList(aggr));

select.setFetchColumns(Arrays.asList(allColumns));

select.setFromList(randomTables);

select.setWhereClause(randomWhereCondition);

if (Randomly.getBooleanWithSmallProbability()) {

select.setOrderByExpressions(new PostgresExpressionGenerator(globalState).setColumns(columns)

.setGlobalState(globalState).generateOrderBy());

}

select.setSelectType(SelectType.ALL);

select.setJoinClauses(joinStatements);

int firstCount = 0;

try (Statement stat = con.createStatement()) {

firstQueryString = PostgresVisitor.asString(select);

if (options.logEachSelect()) {

logger.writeCurrent(firstQueryString);

}

try (ResultSet rs = stat.executeQuery(firstQueryString)) {

while (rs.next()) {

firstCount++;

}

}

} catch (SQLException e) {

throw new IgnoreMeException();

}

return firstCount;

}

// private int getFirstAlternativeQueryCount(Connection con,

// List<PostgresFromTable> randomTables,

// List<PostgresColumn> columns,

// PostgresExpression randomWhereCondition, List<PostgresExpression> groupBys,

// List<PostgresJoin> joinStatements) throws SQLException {

// PostgresSelect select = new PostgresSelect();

//// select.setGroupByClause(groupBys);

// PostgresColumnValue aggr = new PostgresColumnValue(new PostgresColumn("*",

// PostgresDataType.INT), null);

// select.setFetchColumns(Arrays.asList(aggr));

// select.setFromTables(randomTables);

// select.setWhereClause(randomWhereCondition);

// if (Randomly.getBooleanWithSmallProbability()) {

//// select.setOrderByClause(getRandomExpressions(columns));

// }

// select.setSelectType(SelectType.ALL);

// select.setJoinClauses(joinStatements);

// int firstCount = 0;

// try (Statement stat = con.createStatement()) {

// firstQueryString = PostgresVisitor.asString(select);

//// if (options.logEachSelect()) {

//// logger.writeCurrent(firstQueryString);

//// }

// try (ResultSet rs = stat.executeQuery(firstQueryString)) {

// while (rs.next()) {

// firstCount += 1;

// }

// }

// } catch (SQLException e) {

// throw new IgnoreMeException();

// }

// return firstCount;

// }

}