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use super::*;

impl IndexBuilder for PostgresQueryBuilder {
    fn prepare_table_index_expression(&self, create: &IndexCreateStatement, sql: &mut SqlWriter) {
        if create.index.name.is_some() {
            write!(sql, "CONSTRAINT ").unwrap();
            self.prepare_index_name(&create.index.name, sql);
            write!(sql, " ").unwrap();
        }

        self.prepare_index_prefix(create, sql);

        self.prepare_index_columns(&create.index.columns, sql);
    }

    fn prepare_index_create_statement(&self, create: &IndexCreateStatement, sql: &mut SqlWriter) {
        write!(sql, "CREATE ").unwrap();
        self.prepare_index_prefix(create, sql);
        write!(sql, "INDEX ").unwrap();

        self.prepare_index_name(&create.index.name, sql);

        write!(sql, " ON ").unwrap();
        if let Some(table) = &create.table {
            table.prepare(sql, '"');
        }

        self.prepare_index_type(&create.index_type, sql);

        self.prepare_index_columns(&create.index.columns, sql);
    }

    fn prepare_index_drop_statement(&self, drop: &IndexDropStatement, sql: &mut SqlWriter) {
        write!(sql, "DROP INDEX ").unwrap();
        if let Some(name) = &drop.index.name {
            write!(sql, "\"{}\"", name).unwrap();
        }
    }

    fn prepare_index_type(&self, col_index_type: &Option<IndexType>, sql: &mut SqlWriter) {
        if let Some(index_type) = col_index_type {
            write!(
                sql,
                " USING {}",
                match index_type {
                    IndexType::BTree => "BTREE".to_owned(),
                    IndexType::FullText => "GIN".to_owned(),
                    IndexType::Hash => "HASH".to_owned(),
                    IndexType::Custom(custom) => custom.to_string(),
                }
            )
            .unwrap();
        }
    }

    fn prepare_index_prefix(&self, create: &IndexCreateStatement, sql: &mut SqlWriter) {
        if create.primary {
            write!(sql, "PRIMARY KEY ").unwrap();
        }
        if create.unique {
            write!(sql, "UNIQUE ").unwrap();
        }
    }
}