//
//  SA_DiceErrorHandling.m
//
//	Copyright (c) 2016 Said Achmiz.
//
//	This software is licensed under the MIT license.
//	See the file "LICENSE" for more information.

#import "SA_DiceErrorHandling.h"

#import "SA_DiceExpressionStringConstants.h"

@implementation SA_DiceErrorHandler

+(void) addError:(NSString *)error
	toExpression:(NSMutableDictionary *)expression {
	if (error == nil || expression == nil) {
		return;
	}

	if (expression[SA_DB_ERRORS] == nil) {
		expression[SA_DB_ERRORS] = [NSMutableArray <NSString *> arrayWithObjects:error, nil];
	} else {
		[expression[SA_DB_ERRORS] addObject:error];
	}
}

// Top-level errors only (i.e. the expression tree is not traversed in search
// of deeper errors).
+(void) addErrorsFromExpression:(NSDictionary *)sourceExpression
				   toExpression:(NSMutableDictionary *)targetExpression {
	if (sourceExpression == nil || targetExpression == nil) {
		return;
	}

	if (sourceExpression[SA_DB_ERRORS] == nil || [sourceExpression[SA_DB_ERRORS] count] == 0) {
		// Do absolutely nothing; no errors to add.
	} else if(targetExpression[SA_DB_ERRORS] == nil) {
		targetExpression[SA_DB_ERRORS] = [NSMutableArray <NSString *> arrayWithArray:sourceExpression[SA_DB_ERRORS]];
	} else {
		[targetExpression[SA_DB_ERRORS] addObjectsFromArray:sourceExpression[SA_DB_ERRORS]];
	}
}

+(NSArray <NSString *> *) errorsForExpression:(NSDictionary *)expression {
	return ([expression[SA_DB_ERRORS] count] > 0) ? expression[SA_DB_ERRORS] : nil;
}


@end