// © 2020 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#ifndef __NUMBER_USAGEPREFS_H__

#define __NUMBER_USAGEPREFS_H__

#include "cmemory.h"

#include "number_types.h"

#include "unicode/listformatter.h"

#include "unicode/localpointer.h"

#include "unicode/locid.h"

#include "unicode/measunit.h"

#include "unicode/stringpiece.h"

#include "unicode/uobject.h"

#include "units_converter.h"

#include "units_router.h"

U_NAMESPACE_BEGIN

using ::icu::units::ComplexUnitsConverter;

using ::icu::units::UnitsRouter;

namespace number::impl {

/**

 * A MicroPropsGenerator which uses UnitsRouter to produce output converted to a

 * MeasureUnit appropriate for a particular localized usage: see

 * NumberFormatterSettings::usage().

 */

class UsagePrefsHandler : public MicroPropsGenerator, public UMemory {

  public:

    UsagePrefsHandler(const Locale &locale, const MeasureUnit &inputUnit, const StringPiece usage,

                      const MicroPropsGenerator *parent, UErrorCode &status);

    /**

     * Obtains the appropriate output value, MeasureUnit and

     * rounding/precision behaviour from the UnitsRouter.

     *

     * The output unit is passed on to the LongNameHandler via

     * micros.outputUnit.

     */

    void processQuantity(DecimalQuantity &quantity, MicroProps &micros,

                         UErrorCode &status) const override;

    /**

     * Returns the list of possible output units, i.e. the full set of

     * preferences, for the localized, usage-specific unit preferences.

     *

     * The returned pointer should be valid for the lifetime of the

     * UsagePrefsHandler instance.

     */

    const MaybeStackVector<MeasureUnit> *getOutputUnits() const {

        return fUnitsRouter.getOutputUnits();

    }

  private:

    UnitsRouter fUnitsRouter;

    const MicroPropsGenerator *fParent;

};

/**

 * A MicroPropsGenerator which converts a measurement from one MeasureUnit to

 * another. In particular, the output MeasureUnit may be a mixed unit. (The

 * input unit may not be a mixed unit.)

 */

class UnitConversionHandler : public MicroPropsGenerator, public UMemory {

  public:

    /**

     * Constructor.

     *

     * @param targetUnit Specifies the output MeasureUnit. The input MeasureUnit

     *     is derived from it: in case of a mixed unit, the biggest unit is

     *     taken as the input unit. If not a mixed unit, the input unit will be

     *     the same as the output unit and no unit conversion takes place.

     * @param parent The parent MicroPropsGenerator.

     * @param status Receives status.

     */

    UnitConversionHandler(const MeasureUnit &targetUnit, const MicroPropsGenerator *parent,

                          UErrorCode &status);

    /**

     * Obtains the appropriate output values from the Unit Converter.

     */

    void processQuantity(DecimalQuantity &quantity, MicroProps &micros,

                         UErrorCode &status) const override;

  private:

    MeasureUnit fOutputUnit;

    LocalPointer<ComplexUnitsConverter> fUnitConverter;

    const MicroPropsGenerator *fParent;

};

} // namespace number::impl

U_NAMESPACE_END

#endif // __NUMBER_USAGEPREFS_H__

#endif /* #if !UCONFIG_NO_FORMATTING */