/**
 * Keyman is copyright (C) SIL International. MIT License.
 * 
 * CoreAction.m
 * Keyman
 * 
 * Created by Shawn Schantz on 2023-02-21.
 * 
 * A value object representing one or more actions returned by Keyman Core. A
 * list of Actions is returned by Core when processing a key down event. These
 * actions are applied by the platform code to update the context.
 *
 * The ActionType is a one-to-one mapping to that returned from Core but with
 * one exception. Keyman Core defines a single Backspace action, but CoreAction
 * defines two, one for markers and one for characters. The two backspace
 * actions are handled much differently when being applied to the client.
 */

#import "CoreAction.h"

@implementation CoreAction

/*
 * Designated initializer
 */
-(instancetype)initWithType: (ActionType)type actionContent:(NSString*)content backspaceCount:(int)backspaceCount key:(NSString*)key value:(NSString*)value scope:(UInt8)scope {
  self = [super init];
  if (self) {
    self->_actionType = type;
    switch (type)
    {
      case EndAction: {
        self->_typeName = @"End";
        break;
      }
      case CharacterAction: {
        self->_typeName = @"Character";
        self->_content = content;
        break;
      }
      case MarkerAction: {
        self->_typeName = @"Marker";
        break;
      }
      case AlertAction: {
        self->_typeName = @"Alert";
        break;
      }
      case CharacterBackspaceAction: {
        self->_typeName = @"Character Backspace";
        self->_backspaceCount = backspaceCount;
        break;
      }
      case MarkerBackspaceAction: {
        self->_typeName = @"Marker Backspace";
        self->_backspaceCount = backspaceCount;
        break;
      }
      case PersistOptionAction: {
        self->_typeName = @"Persist Option";
        self->_key = key;
        self->_value = value;
        self->_scope = scope;
        break;
      }
      case EmitKeystrokeAction: {
        self->_typeName = @"Emit Keystroke";
        break;
      }
      case InvalidateContextAction: {
        self->_typeName = @"Invalidate Context";
        break;
      }
      case CapsLockAction: {
        self->_typeName = @"Caps Lock";
        break;
      }
      default: {
        self->_typeName = @"Unknown";
      }
    }
  }
  return self;
}

/*
 * This is implemented so that there is no path to init a CoreAction object without
 * going through the designated initializer, initWithType. It blocks a direct call to super init which
 * would result in uninitialized fields. This init results in a hard-coded AlertAction and
 * should not be used.
 */
-(instancetype)init {
  return [self initWithType:AlertAction actionContent:@"" backspaceCount:0 key:@"" value:@"" scope:0];
}

-(instancetype)initCharacterAction:(NSString*)content {
  self = [self initWithType: CharacterAction actionContent:content backspaceCount:0 key:@"" value:@"" scope:0];
  return self;
}

-(instancetype)initCharacterBackspaceAction:(NSString*)content {
  self = [self initWithType: CharacterBackspaceAction actionContent:content backspaceCount:1 key:@"" value:@"" scope:0];
  return self;
}

-(instancetype)initMarkerBackspaceAction:(int)count {
  self = [self initWithType: MarkerBackspaceAction actionContent:@"" backspaceCount:count key:@"" value:@"" scope:0];
  return self;
}

-(instancetype)initPersistOptionAction:(NSString*)key value:(NSString*)value scope:(UInt8)scope {
  self = [self initWithType: PersistOptionAction actionContent:@"" backspaceCount:0 key:key value:value scope:scope];
  return self;
}

-(BOOL)isCharacter {
  return self.actionType==CharacterAction;
}

-(BOOL)isCharacterBackspace {
  return self.actionType==CharacterBackspaceAction;
}

-(BOOL)isMarker {
  return self.actionType==MarkerAction;
}

-(BOOL)isMarkerBackspace {
  return self.actionType==MarkerBackspaceAction;
}

// TODO: add new fields to description
-(NSString *)description
{
  NSString *charString = nil;
  BOOL hasCharacterString = (self.isCharacter) || (self.isCharacterBackspace);
  
  if(hasCharacterString) {
    const unichar unicodeChar = [_content characterAtIndex:0];
    charString = [[NSString alloc] initWithFormat:@"%u / 0x%X : '%@'", unicodeChar, unicodeChar, _content];
  } else {
    charString = @"";
  }
  
  return [[NSString alloc] initWithFormat: @"%@ %@", self.typeName, charString];
}

@end