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package liquibase.database.core;

import liquibase.CatalogAndSchema;
import liquibase.database.AbstractJdbcDatabase;
import liquibase.database.DatabaseConnection;
import liquibase.database.OfflineConnection;
import liquibase.exception.DatabaseException;
import liquibase.executor.ExecutorService;
import liquibase.logging.LogFactory;
import liquibase.statement.DatabaseFunction;
import liquibase.statement.core.RawCallStatement;
import liquibase.statement.core.RawSqlStatement;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.Catalog;
import liquibase.structure.core.Schema;
import liquibase.structure.core.Table;

import java.lang.reflect.Method;
import java.sql.Connection;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Encapsulates Oracle database support.
 */
public class OracleDatabase extends AbstractJdbcDatabase {
    public static final String PRODUCT_NAME = "oracle";


    private Set reservedWords = new HashSet();
    private Set userDefinedTypes = null;

    public OracleDatabase() {
        super.unquotedObjectsAreUppercased=true;
        super.setCurrentDateTimeFunction("SYSTIMESTAMP");
        // Setting list of Oracle's native functions
        dateFunctions.add(new DatabaseFunction("SYSDATE"));
        dateFunctions.add(new DatabaseFunction("SYSTIMESTAMP"));
        dateFunctions.add(new DatabaseFunction("CURRENT_TIMESTAMP"));
        super.sequenceNextValueFunction = "%s.nextval";
        super.sequenceCurrentValueFunction = "%s.currval";
    }

    @Override
    public int getPriority() {
        return PRIORITY_DEFAULT;
    }

    @Override
    public void setConnection(DatabaseConnection conn) {
        try {
            Method wrappedConn = conn.getClass().getMethod("getWrappedConnection");
            wrappedConn.setAccessible(true);
            Connection sqlConn = (Connection) wrappedConn.invoke(conn);
            Method method = sqlConn.getClass().getMethod("setRemarksReporting", Boolean.TYPE);
            method.setAccessible(true);
            method.invoke(sqlConn, true);

            reservedWords.addAll(Arrays.asList(sqlConn.getMetaData().getSQLKeywords().toUpperCase().split(",\\s*")));
            reservedWords.addAll(Arrays.asList("GROUP", "USER", "SESSION","PASSWORD", "RESOURCE", "START", "SIZE", "UID", "DESC")); //more reserved words not returned by driver
        } catch (Exception e) {
            LogFactory.getLogger().info("Could not set remarks reporting on OracleDatabase: " + e.getMessage());
            ; //cannot set it. That is OK
        }
        super.setConnection(conn);
    }

    @Override
    public String getShortName() {
        return "oracle";
    }

    @Override
    protected String getDefaultDatabaseProductName() {
        return "Oracle";
    }

    @Override
    public Integer getDefaultPort() {
        return 1521;
    }

    @Override
    public String getJdbcCatalogName(CatalogAndSchema schema) {
        return null;
    }

    @Override
    public String getJdbcSchemaName(CatalogAndSchema schema) {
        return correctObjectName(schema.getCatalogName() == null ? schema.getSchemaName() : schema.getCatalogName(), Schema.class);
    }

    @Override
    public String generatePrimaryKeyName(String tableName) {
        if (tableName.length() > 27) {
            return "PK_" + tableName.toUpperCase().substring(0, 27);
        } else {
            return "PK_" + tableName.toUpperCase();
        }
    }

    @Override
    public boolean supportsInitiallyDeferrableColumns() {
        return true;
    }

    @Override
    public boolean isReservedWord(String objectName) {
        return reservedWords.contains(objectName.toUpperCase());
    }

    @Override
    public boolean supportsSequences() {
        return true;
    }

    /**
     * Oracle supports catalogs in liquibase terms
     *
     * @return
     */
    @Override
    public boolean supportsSchemas() {
        return false;
    }

    @Override
    protected String getConnectionCatalogName() throws DatabaseException {
        if (getConnection() instanceof OfflineConnection) {
            return getConnection().getCatalog();
        }
        try {
            return ExecutorService.getInstance().getExecutor(this).queryForObject(new RawCallStatement("select sys_context( 'userenv', 'current_schema' ) from dual"), String.class);
        } catch (Exception e) {
            LogFactory.getLogger().info("Error getting default schema", e);
        }
        return null;
    }

    @Override
    public boolean isCorrectDatabaseImplementation(DatabaseConnection conn) throws DatabaseException {
        return PRODUCT_NAME.equalsIgnoreCase(conn.getDatabaseProductName());
    }

    @Override
    public String getDefaultDriver(String url) {
        if (url.startsWith("jdbc:oracle")) {
            return "oracle.jdbc.OracleDriver";
        }
        return null;
    }

    @Override
    public String getDefaultCatalogName() {//NOPMD
        return super.getDefaultCatalogName() == null ? null : super.getDefaultCatalogName().toUpperCase();
    }

    /**
     * Return an Oracle date literal with the same value as a string formatted using ISO 8601.
     * 
     * Convert an ISO8601 date string to one of the following results:
     * to_date('1995-05-23', 'YYYY-MM-DD')
     * to_date('1995-05-23 09:23:59', 'YYYY-MM-DD HH24:MI:SS')
     * 
     * Implementation restriction:
     * Currently, only the following subsets of ISO8601 are supported:
     * YYYY-MM-DD
     * YYYY-MM-DDThh:mm:ss
     */
    @Override
    public String getDateLiteral(String isoDate) {
        String normalLiteral = super.getDateLiteral(isoDate);

        if (isDateOnly(isoDate)) {
            StringBuffer val = new StringBuffer();
            val.append("to_date(");
            val.append(normalLiteral);
            val.append(", 'YYYY-MM-DD')");
            return val.toString();
        } else if (isTimeOnly(isoDate)) {
            StringBuffer val = new StringBuffer();
            val.append("to_date(");
            val.append(normalLiteral);
            val.append(", 'HH24:MI:SS')");
            return val.toString();
        } else if (isDateTime(isoDate)) {
            normalLiteral = normalLiteral.substring(0, normalLiteral.lastIndexOf('.')) + "'";

            StringBuffer val = new StringBuffer(26);
            val.append("to_date(");
            val.append(normalLiteral);
            val.append(", 'YYYY-MM-DD HH24:MI:SS')");
            return val.toString();
        } else {
            return "UNSUPPORTED:" + isoDate;
        }
    }

    @Override
    public boolean isSystemObject(DatabaseObject example) {
        if (example == null) {
            return false;
        }

        if (this.isLiquibaseObject(example)) {
            return false;
        }

        if (example instanceof Schema) {
            if ("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName())|| "XDB".equals(example.getName())) {
                return true;
            }
            if ("SYSTEM".equals(example.getSchema().getCatalogName()) || "SYS".equals(example.getSchema().getCatalogName()) || "CTXSYS".equals(example.getSchema().getCatalogName()) || "XDB".equals(example.getSchema().getCatalogName())) {
                return true;
            }
        } else if (isSystemObject(example.getSchema())) {
            return true;
        }
        if (example instanceof Catalog) {
            if (("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName()) || "XDB".equals(example.getName()))) {
                return true;
            }
        } else if (example.getName() != null) {
            if (example.getName().startsWith("BIN$")) { //oracle deleted table
                return true;
            } else if (example.getName().startsWith("AQ$")) { //oracle AQ tables
                return true;
            } else if (example.getName().startsWith("DR$")) { //oracle index tables
                return true;
            } else if (example.getName().startsWith("SYS_IOT_OVER")) { //oracle system table
                return true;
            } else if (example.getName().startsWith("MLOG$_")) { //Created by materliaized view logs for every table that is part of a materialized view. Not available for DDL operations.
                return true;
            } else if (example.getName().startsWith("RUPD$_")) { //Created by materialized view log tables using primary keys. Not available for DDL operations.
                return true;
            } else if (example.getName().startsWith("WM$_")) { //Workspace Manager backup tables.
                return true;
            } else if (example.getName().equals("CREATE$JAVA$LOB$TABLE")) { //This table contains the name of the Java object, the date it was loaded, and has a BLOB column to store the Java object.
                return true;
            } else if (example.getName().equals("JAVA$CLASS$MD5$TABLE")) { //This is a hash table that tracks the loading of Java objects into a schema.
                return true;
            }
        }

        return super.isSystemObject(example);
    }

    @Override
    public boolean supportsTablespaces() {
        return true;
    }

    @Override
    public boolean supportsAutoIncrement() {
        return false;
    }


//    public Set findUniqueConstraints(String schema) throws DatabaseException {
//        Set returnSet = new HashSet();
//
//        List maps = new Executor(this).queryForList(new RawSqlStatement("SELECT UC.CONSTRAINT_NAME, UCC.TABLE_NAME, UCC.COLUMN_NAME FROM USER_CONSTRAINTS UC, USER_CONS_COLUMNS UCC WHERE UC.CONSTRAINT_NAME=UCC.CONSTRAINT_NAME AND CONSTRAINT_TYPE='U' ORDER BY UC.CONSTRAINT_NAME"));
//
//        UniqueConstraint constraint = null;
//        for (Map map : maps) {
//            if (constraint == null || !constraint.getName().equals(constraint.getName())) {
//                returnSet.add(constraint);
//                Table table = new Table((String) map.get("TABLE_NAME"));
//                constraint = new UniqueConstraint(map.get("CONSTRAINT_NAME").toString(), table);
//            }
//        }
//        if (constraint != null) {
//            returnSet.add(constraint);
//        }
//
//        return returnSet;
//    }

    @Override
    public boolean supportsRestrictForeignKeys() {
        return false;
    }

    @Override
    public int getDataTypeMaxParameters(String dataTypeName) {
        if (dataTypeName.toUpperCase().equals("BINARY_FLOAT")) {
            return 0;
        }
        if (dataTypeName.toUpperCase().equals("BINARY_DOUBLE")) {
            return 0;
        }
        return super.getDataTypeMaxParameters(dataTypeName);
    }

    @Override
    public boolean jdbcCallsCatalogsSchemas() {
        return true;
    }

    public Set getUserDefinedTypes() {
        if (userDefinedTypes == null) {
            userDefinedTypes = new HashSet();
            if (getConnection() != null && !(getConnection() instanceof OfflineConnection)) {
                try {
                    userDefinedTypes.addAll(ExecutorService.getInstance().getExecutor(this).queryForList(new RawSqlStatement("SELECT TYPE_NAME FROM USER_TYPES"), String.class));
                } catch (DatabaseException e) {
                    //ignore error
                }
            }
        }

        return userDefinedTypes;
    }

    @Override
    public String generateDatabaseFunctionValue(DatabaseFunction databaseFunction) {
        if (databaseFunction != null && databaseFunction.toString().equalsIgnoreCase("current_timestamp")) {
            return databaseFunction.toString();
        }
        return super.generateDatabaseFunctionValue(databaseFunction);
    }
}