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declare(strict_types=1);
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declare(strict_types=1);
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namespace core_reportbuilder\local\aggregation;
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namespace core_reportbuilder\local\aggregation;
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use lang_string;
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use core\lang_string;
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use core_reportbuilder\local\report\column;
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use core_reportbuilder\local\report\column;
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 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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 */
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abstract class base {
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abstract class base {
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    /**
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     * Constructor
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     *
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     * @param array $options Aggregation type specific options
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     */
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    public function __construct(
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        /** @var array Aggregation type specific options */
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        protected readonly array $options = [],
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    ) {
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    }
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    /**
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    /**
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     * Return the class name of the aggregation type
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     * Return the class name of the aggregation type
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     *
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     *
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     * @return string
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     * @return string
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     */
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     */
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        string $delimeter = ',',
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        string $delimeter = ',',
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        string $coalescechar = ' '
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        string $coalescechar = ' '
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    ): string {
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    ): string {
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        global $DB;
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        global $DB;
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        // We need to ensure all values are char.
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        // We need to ensure all values are char in supported DBs.
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        $sqlfieldrequirescast = in_array($DB->get_dbfamily(), ['mssql', 'oracle', 'postgres']);
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        $sqlfieldrequirescast = in_array($DB->get_dbfamily(), ['mssql', 'postgres']);
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        $concatfields = [];
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        $concatfields = [];
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        foreach ($sqlfields as $sqlfield) {
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        foreach ($sqlfields as $sqlfield) {
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     * @return string
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     * @return string
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     */
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     */
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    abstract public static function get_field_sql(string $field, int $columntype): string;
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    abstract public static function get_field_sql(string $field, int $columntype): string;
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    /**
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     * Whether the aggregation method is applied to a column, this method determines whether the report table should
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     * group by the column fields or not
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     *
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     * @return bool
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     */
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    public static function column_groupby(): bool {
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        return false;
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    }
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    /**
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     * Return aggregated column type, that being one of the column TYPE_* constants like {@see column::get_type}
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     *
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     * Classes should override this method to define the type of data that the aggregated column value returns (e.g 'count'
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     * returns a numeric value, regardless of the original column type to which it is applied)
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     *
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     * @param int $columntype The type of the column to which the aggregation is applied
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     * @return int
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     */
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    public static function get_column_type(int $columntype): int {
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        return column::TYPE_TEXT;
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    }
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    /**
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    /**
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     * Return formatted value for column when applying aggregation, by default executing all callbacks on the value
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     * Return formatted value for column when applying aggregation, by default executing all callbacks on the value
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     *
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     *
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     * Should be overridden in child classes that need to format the column value differently (e.g. 'sum' would just show
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     * Should be overridden in child classes that need to format the column value differently (e.g. 'sum' would just show
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     * a numeric count value)
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     * a numeric count value)
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     * @param array $values
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     * @param array $values
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     * @param array $callbacks Array of column callbacks, {@see column::add_callback} for definition
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     * @param array $callbacks Array of column callbacks, {@see column::add_callback} for definition
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     * @param int $columntype The original type of the column, to ensure it is preserved for callbacks
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     * @param int $columntype The original type of the column, to ensure it is preserved for callbacks
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     * @return mixed
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     * @return mixed
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     */
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     */
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    public static function format_value($value, array $values, array $callbacks, int $columntype) {
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    public function format_value($value, array $values, array $callbacks, int $columntype) {
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        foreach ($callbacks as $callback) {
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        foreach ($callbacks as $callback) {
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            [$callable, $arguments] = $callback;
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            [$callable, $arguments] = $callback;
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            $value = ($callable)($value, (object) $values, $arguments, static::get_class_name());
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            $value = ($callable)($value, (object) $values, $arguments, static::get_class_name());
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        }
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        }