CREATE OR REPLACE FUNCTION {{.SchemaName}}.{{.FunctionName}}()
RETURNS trigger AS
$body$
DECLARE
    m_funcname text = '{{.FunctionName}}';
    m_user text;
    m_atevent integer;
BEGIN
    -- Get current user
    m_user := {{.UserFunction}}::text;

    -- Skip audit for specific users if needed
    IF m_user IN ('noaudit', 'importuser') THEN
        IF (TG_OP = 'DELETE') THEN
            RETURN OLD;
        ELSIF (TG_OP = 'UPDATE') THEN
            RETURN NEW;
        ELSIF (TG_OP = 'INSERT') THEN
            RETURN NEW;
        END IF;
    END IF;

{{- if .AuditInsert}}
    IF TG_OP = 'INSERT' THEN
        -- Record INSERT
        INSERT INTO {{.AuditSchema}}.atevent (tablename, tableprefix, rid_parent, changeuser, changedate, changetime, actionx)
        VALUES ('{{.TableName}}', {{.TablePrefix}}, new.{{.PrimaryKey}}, m_user, CURRENT_DATE, CURRENT_TIME, 1)
        RETURNING rid_atevent INTO m_atevent;
{{- end}}

{{- if .AuditUpdate}}
    ELSIF TG_OP = 'UPDATE' THEN
        -- Check if any audited columns changed
        IF ({{.UpdateCondition}}) THEN
            INSERT INTO {{.AuditSchema}}.atevent (tablename, tableprefix, rid_parent, changeuser, changedate, changetime, actionx)
            VALUES ('{{.TableName}}', {{.TablePrefix}}, new.{{.PrimaryKey}}, m_user, CURRENT_DATE, CURRENT_TIME, 2)
            RETURNING rid_atevent INTO m_atevent;

            -- Record column changes
{{- range .UpdateColumns}}
            IF (old.{{.Name}} IS DISTINCT FROM new.{{.Name}}) THEN
                INSERT INTO {{$.AuditSchema}}.atdetail(rid_atevent, datacolumn, changedfrom, changedto)
                VALUES (m_atevent, '{{.Name}}', substr({{.OldValue}}, 1, 1000), substr({{.NewValue}}, 1, 1000));
            END IF;
{{- end}}
        END IF;
{{- end}}

{{- if .AuditDelete}}
    ELSIF TG_OP = 'DELETE' THEN
        -- Record DELETE
        INSERT INTO {{.AuditSchema}}.atevent (tablename, tableprefix, rid_parent, rid_deletedparent, changeuser, changedate, changetime, actionx)
        VALUES ('{{.TableName}}', {{.TablePrefix}}, old.{{.PrimaryKey}}, old.{{.PrimaryKey}}, m_user, CURRENT_DATE, CURRENT_TIME, 3)
        RETURNING rid_atevent INTO m_atevent;

        -- Record deleted column values
{{- range .DeleteColumns}}
        INSERT INTO {{$.AuditSchema}}.atdetail(rid_atevent, datacolumn, changedfrom, changedto)
        VALUES (m_atevent, '{{.Name}}', substr({{.OldValue}}, 1, 1000), NULL);
{{- end}}
{{- end}}
    END IF;

    IF (TG_OP = 'DELETE') THEN
        RETURN OLD;
    ELSIF (TG_OP = 'UPDATE') THEN
        RETURN NEW;
    ELSIF (TG_OP = 'INSERT') THEN
        RETURN NEW;
    END IF;

    RETURN NULL;

EXCEPTION
    WHEN OTHERS THEN
        RAISE WARNING 'Audit function % failed: %', m_funcname, SQLERRM;
        RETURN NULL;
END;
$body$
LANGUAGE plpgsql
VOLATILE
SECURITY DEFINER;

COMMENT ON FUNCTION {{.SchemaName}}.{{.FunctionName}}() IS 'Audit trigger function for table {{.SchemaName}}.{{.TableName}}';