/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsIConstraintValidition_h_
#define nsIConstraintValidition_h_

#include "nsISupports.h"

class nsIContent;

namespace mozilla::dom {
class ValidityState;
}  // namespace mozilla::dom

#define NS_ICONSTRAINTVALIDATION_IID \
  {0x983829da, 0x1aaf, 0x449c, {0xa3, 0x06, 0x85, 0xd4, 0xf0, 0x31, 0x1c, 0xf6}}

/**
 * This interface is for form elements implementing the validity constraint API.
 * See: http://dev.w3.org/html5/spec/forms.html#the-constraint-validation-api
 *
 * This interface has to be implemented by all elements implementing the API
 * and only them.
 */
class nsIConstraintValidation : public nsISupports {
 public:
  NS_INLINE_DECL_STATIC_IID(NS_ICONSTRAINTVALIDATION_IID);

  friend class mozilla::dom::ValidityState;

  static const uint16_t sContentSpecifiedMaxLengthMessage;

  virtual ~nsIConstraintValidation();

  bool IsValid() const { return mValidityBitField == 0; }

  bool IsCandidateForConstraintValidation() const {
    return !mBarredFromConstraintValidation;
  }

  enum ValidityStateType {
    VALIDITY_STATE_VALUE_MISSING = 0x1 << 0,
    VALIDITY_STATE_TYPE_MISMATCH = 0x1 << 1,
    VALIDITY_STATE_PATTERN_MISMATCH = 0x1 << 2,
    VALIDITY_STATE_TOO_LONG = 0x1 << 3,
    VALIDITY_STATE_TOO_SHORT = 0x1 << 4,
    VALIDITY_STATE_RANGE_UNDERFLOW = 0x1 << 5,
    VALIDITY_STATE_RANGE_OVERFLOW = 0x1 << 6,
    VALIDITY_STATE_STEP_MISMATCH = 0x1 << 7,
    VALIDITY_STATE_BAD_INPUT = 0x1 << 8,
    VALIDITY_STATE_CUSTOM_ERROR = 0x1 << 9,
  };

  void SetValidityState(ValidityStateType aState, bool aValue);

  /**
   * Check the validity of this object. If it is not valid, file a "invalid"
   * event on the aEventTarget.
   *
   * @param aEventTarget   The target of the event.
   * @param aDefaultAction Set to true if default action should be taken,
   *                       see EventTarget::DispatchEvent.
   * @return whether it's valid.
   */
  bool CheckValidity(nsIContent& aEventTarget,
                     bool* aEventDefaultAction = nullptr) const;

  // Web IDL binding methods
  bool WillValidate() const { return IsCandidateForConstraintValidation(); }
  mozilla::dom::ValidityState* Validity();
  bool ReportValidity();

 protected:
  // You can't instantiate an object from that class.
  nsIConstraintValidation();

  bool GetValidityState(ValidityStateType aState) const {
    return mValidityBitField & aState;
  }

  void SetBarredFromConstraintValidation(bool aBarred);

  /**
   * A pointer to the ValidityState object.
   */
  RefPtr<mozilla::dom::ValidityState> mValidity;

 private:
  /**
   * A bitfield representing the current validity state of the element.
   * Each bit represent an error. All bits to zero means the element is valid.
   */
  int16_t mValidityBitField;

  /**
   * Keeps track whether the element is barred from constraint validation.
   */
  bool mBarredFromConstraintValidation;
};

#endif  // nsIConstraintValidation_h___