<?xml version="1.0" encoding="utf-8"?>
<databaseChangeLog
    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
    xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.5.xsd
                        http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">

    <!-- Table for historical user data. -->
    <changeSet id="20190526150000-1" author="mhierweck,mhoennig" dbms="postgresql">

        <createTable tableName="jhi_user_history">

            <!-- history-related columns -->

            <column name="history_id" type="bigint" autoIncrement="true">
                <constraints primaryKey="true" unique="true" nullable="false"/>
            </column>

            <column name="history_transaction" type="bigint">
                <constraints nullable="false" />
            </column>

            <column name="history_tombstone" type="bool">
                <constraints nullable="false" />
            </column>

            <!-- id-column like in base table, but no primary key nor unique -->

            <column name="id" type="bigint" autoIncrement="${autoIncrement}">
                <constraints primaryKey="true" nullable="false"/>
            </column>

            <!-- all following columns like in base table, dropping unique constraints -->

            <column name="login" type="varchar(50)">
                <constraints nullable="false"/>
            </column>
            <column name="password_hash" type="varchar(60)"/>
            <column name="first_name" type="varchar(50)"/>
            <column name="last_name" type="varchar(50)"/>
            <column name="email" type="varchar(191)">
                <constraints nullable="false"/>
            </column>
            <column name="image_url" type="varchar(256)"/>
            <column name="activated" type="boolean" valueBoolean="false">
                <constraints nullable="false" />
            </column>
            <column name="lang_key" type="varchar(6)"/>
            <column name="activation_key" type="varchar(20)"/>
            <column name="reset_key" type="varchar(20)"/>
            <column name="created_by" type="varchar(50)">
                <constraints nullable="false"/>
            </column>
            <column name="created_date" type="timestamp"/>
            <column name="reset_date" type="timestamp">
                <constraints nullable="true"/>
            </column>
            <column name="last_modified_by" type="varchar(50)"/>
            <column name="last_modified_date" type="timestamp"/>
        </createTable>

    </changeSet>

    <changeSet id="20190526150000-2" author="mhierweck,mhoennig" dbms="postgresql">

        <addForeignKeyConstraint baseColumnNames="history_transaction"
                                 baseTableName="jhi_user_history"
                                 constraintName="fk_jhi_user_history_transaction"
                                 referencedColumnNames="history_transaction"
                                 referencedTableName="history"/>

    </changeSet>

    <changeSet id="20190526150000-3" author="mhierweck,mhoennig" dbms="postgresql">
        <createProcedure>
            CREATE TRIGGER jhi_user_historicize
            AFTER INSERT OR DELETE OR UPDATE ON jhi_user
            FOR EACH ROW EXECUTE PROCEDURE historicize();
        </createProcedure>
        <rollback>
            DROP TRIGGER jhi_user_historicize
        </rollback>
    </changeSet>

    <changeSet id="20190526150000-4" author="mhierweck,mhoennig" dbms="postgresql">
        <createView viewName="jhi_user_history_view" replaceIfExists="true">
            SELECT *
              FROM jhi_user_history
             WHERE history_id IN (
                SELECT max(history_id) AS history_id
                  FROM jhi_user_history
                 WHERE history_transaction &lt;= current_setting('history.transaction')::bigint
                 GROUP BY login) -- must have a unique constraint
        </createView>
    </changeSet>

</databaseChangeLog>
