#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

#ifndef __has_feature      // Optional.
#define __has_feature(x) 0 // Compatibility with non-clang compilers.
#endif

#ifndef NS_RETURNS_NOT_RETAINED
#if __has_feature(attribute_ns_returns_not_retained)
#define NS_RETURNS_NOT_RETAINED __attribute__((ns_returns_not_retained))
#else
#define NS_RETURNS_NOT_RETAINED
#endif
#endif

@class SqfliteDarwinDatabase;
@class SqfliteDarwinStatement;

/** Types for columns in a result set.
 */
typedef NS_ENUM(int, SqliteValueType) {
    SqliteValueTypeInteger = 1,
    SqliteValueTypeFloat   = 2,
    SqliteValueTypeText    = 3,
    SqliteValueTypeBlob    = 4,
    SqliteValueTypeNull    = 5
};

/** Represents the results of executing a query on an @c SqfliteDarwinDatabase .
 
 See also
 
 - @c SqfliteDarwinDatabase
 */

@interface SqfliteDarwinResultSet : NSObject

@property (nonatomic, retain, nullable) SqfliteDarwinDatabase *parentDB;

///-----------------
/// @name Properties
///-----------------

/** Executed query */

@property (atomic, retain, nullable) NSString *query;

/** `NSMutableDictionary` mapping column names to numeric index */

@property (readonly) NSMutableDictionary *columnNameToIndexMap;

/** `SqfliteDarwinStatement` used by result set. */

@property (atomic, retain, nullable) SqfliteDarwinStatement *statement;

///------------------------------------
/// @name Creating and closing a result set
///------------------------------------

/** Close result set */

- (void)close;

///---------------------------------------
/// @name Iterating through the result set
///---------------------------------------

/** Retrieve next row for result set.
 
 You must always invoke `next` or `nextWithError` before attempting to access the values returned in a query, even if you're only expecting one.

 @return @c YES if row successfully retrieved; @c NO if end of result set reached
 
 @see hasAnotherRow
 */

- (BOOL)next;

/** Retrieve next row for result set.
 
  You must always invoke `next` or `nextWithError` before attempting to access the values returned in a query, even if you're only expecting one.
 
 @param outErr A 'NSError' object to receive any error object (if any).
 
 @return 'YES' if row successfully retrieved; 'NO' if end of result set reached
 
 @see hasAnotherRow
 */

- (BOOL)nextWithError:(NSError * _Nullable __autoreleasing *)outErr;

/** Perform SQL statement.

 @return 'YES' if successful; 'NO' if not.

 @see hasAnotherRow
*/

- (BOOL)step;

/** Perform SQL statement.

 @param outErr A 'NSError' object to receive any error object (if any).

 @return 'YES' if successful; 'NO' if not.

 @see hasAnotherRow
*/

- (BOOL)stepWithError:(NSError * _Nullable __autoreleasing *)outErr;

/** Did the last call to `<next>` succeed in retrieving another row?

 @return 'YES' if there is another row; 'NO' if not.

 @see next
 
 @warning The `hasAnotherRow` method must follow a call to `<next>`. If the previous database interaction was something other than a call to `next`, then this method may return @c NO, whether there is another row of data or not.
 */

- (BOOL)hasAnotherRow;

///---------------------------------------------
/// @name Retrieving information from result set
///---------------------------------------------

/** How many columns in result set
 
 @return Integer value of the number of columns.
 */

@property (nonatomic, readonly) int columnCount;

/** Column index for column name

 @param columnName @c NSString  value of the name of the column.

 @return Zero-based index for column.
 */

- (int)columnIndexForName:(NSString*)columnName;

/** Column name for column index

 @param columnIdx Zero-based index for column.

 @return columnName @c NSString  value of the name of the column.
 */

- (NSString * _Nullable)columnNameForIndex:(int)columnIdx;

/** Result set integer value for column.

 @param columnName @c NSString  value of the name of the column.

 @return @c int  value of the result set's column.
 */

- (int)intForColumn:(NSString*)columnName;

/** Result set integer value for column.

 @param columnIdx Zero-based index for column.

 @return @c int  value of the result set's column.
 */

- (int)intForColumnIndex:(int)columnIdx;

/** Result set @c long  value for column.

 @param columnName @c NSString  value of the name of the column.

 @return @c long  value of the result set's column.
 */

- (long)longForColumn:(NSString*)columnName;

/** Result set long value for column.

 @param columnIdx Zero-based index for column.

 @return @c long  value of the result set's column.
 */

- (long)longForColumnIndex:(int)columnIdx;

/** Result set `long long int` value for column.

 @param columnName @c NSString  value of the name of the column.

 @return `long long int` value of the result set's column.
 */

- (long long int)longLongIntForColumn:(NSString*)columnName;

/** Result set `long long int` value for column.

 @param columnIdx Zero-based index for column.

 @return `long long int` value of the result set's column.
 */

- (long long int)longLongIntForColumnIndex:(int)columnIdx;

/** Result set `unsigned long long int` value for column.

 @param columnName @c NSString  value of the name of the column.

 @return `unsigned long long int` value of the result set's column.
 */

- (unsigned long long int)unsignedLongLongIntForColumn:(NSString*)columnName;

/** Result set `unsigned long long int` value for column.

 @param columnIdx Zero-based index for column.

 @return `unsigned long long int` value of the result set's column.
 */

- (unsigned long long int)unsignedLongLongIntForColumnIndex:(int)columnIdx;

/** Result set `BOOL` value for column.

 @param columnName @c NSString  value of the name of the column.

 @return `BOOL` value of the result set's column.
 */

- (BOOL)boolForColumn:(NSString*)columnName;

/** Result set `BOOL` value for column.

 @param columnIdx Zero-based index for column.

 @return `BOOL` value of the result set's column.
 */

- (BOOL)boolForColumnIndex:(int)columnIdx;

/** Result set `double` value for column.

 @param columnName @c NSString  value of the name of the column.

 @return `double` value of the result set's column.
 
 */

- (double)doubleForColumn:(NSString*)columnName;

/** Result set `double` value for column.

 @param columnIdx Zero-based index for column.

 @return `double` value of the result set's column.
 
 */

- (double)doubleForColumnIndex:(int)columnIdx;

/** Result set @c NSString  value for column.

 @param columnName @c NSString  value of the name of the column.

 @return String value of the result set's column.
 
 */

- (NSString * _Nullable)stringForColumn:(NSString*)columnName;

/** Result set @c NSString  value for column.

 @param columnIdx Zero-based index for column.

 @return String value of the result set's column.
 */

- (NSString * _Nullable)stringForColumnIndex:(int)columnIdx;

/** Result set @c NSDate  value for column.

 @param columnName @c NSString  value of the name of the column.

 @return Date value of the result set's column.
 */

- (NSDate * _Nullable)dateForColumn:(NSString*)columnName;

/** Result set @c NSDate  value for column.

 @param columnIdx Zero-based index for column.

 @return Date value of the result set's column.
 
 */

- (NSDate * _Nullable)dateForColumnIndex:(int)columnIdx;

/** Result set @c NSData  value for column.
 
 This is useful when storing binary data in table (such as image or the like).

 @param columnName @c NSString  value of the name of the column.

 @return Data value of the result set's column.
 
 */

- (NSData * _Nullable)dataForColumn:(NSString*)columnName;

/** Result set @c NSData  value for column.

 @param columnIdx Zero-based index for column.

 @warning For zero length BLOBs, this will return `nil`. Use `typeForColumn` to determine whether this was really a zero
    length BLOB or `NULL`.

 @return Data value of the result set's column.
 */

- (NSData * _Nullable)dataForColumnIndex:(int)columnIdx;

/** Result set `(const unsigned char *)` value for column.

 @param columnName @c NSString  value of the name of the column.

 @warning For zero length BLOBs, this will return `nil`. Use `typeForColumnIndex` to determine whether this was really a zero
 length BLOB or `NULL`.

 @return `(const unsigned char *)` value of the result set's column.
 */

- (const unsigned char * _Nullable)UTF8StringForColumn:(NSString*)columnName;

- (const unsigned char * _Nullable)UTF8StringForColumnName:(NSString*)columnName __deprecated_msg("Use UTF8StringForColumn instead");

/** Result set `(const unsigned char *)` value for column.

 @param columnIdx Zero-based index for column.

 @return `(const unsigned char *)` value of the result set's column.
 */

- (const unsigned char * _Nullable)UTF8StringForColumnIndex:(int)columnIdx;

/** Result set object for column.

 @param columnName Name of the column.

 @return Either @c NSNumber , @c NSString , @c NSData , or @c NSNull . If the column was @c NULL , this returns `[NSNull null]` object.

 @see objectForKeyedSubscript:
 */

- (id _Nullable)objectForColumn:(NSString*)columnName;

- (id _Nullable)objectForColumnName:(NSString*)columnName __deprecated_msg("Use objectForColumn instead");

/** Column type by column name.

 @param columnName Name of the column.

 @return The `SqliteValueType` of the value in this column.
 */

- (SqliteValueType)typeForColumn:(NSString*)columnName;

/** Column type by column index.

 @param columnIdx Index of the column.

 @return The `SqliteValueType` of the value in this column.
 */

- (SqliteValueType)typeForColumnIndex:(int)columnIdx;


/** Result set object for column.

 @param columnIdx Zero-based index for column.

 @return Either @c NSNumber , @c NSString , @c NSData , or @c NSNull . If the column was @c NULL , this returns `[NSNull null]` object.

 @see objectAtIndexedSubscript:
 */

- (id _Nullable)objectForColumnIndex:(int)columnIdx;

/** Result set object for column.
 
 This method allows the use of the "boxed" syntax supported in Modern Objective-C. For example, by defining this method, the following syntax is now supported:

@code
id result = rs[@"employee_name"];
@endcode

 This simplified syntax is equivalent to calling:
 
@code
id result = [rs objectForKeyedSubscript:@"employee_name"];
@endcode

 which is, it turns out, equivalent to calling:
 
@code
id result = [rs objectForColumnName:@"employee_name"];
@endcode

 @param columnName @c NSString  value of the name of the column.

 @return Either @c NSNumber , @c NSString , @c NSData , or @c NSNull . If the column was @c NULL , this returns `[NSNull null]` object.
 */

- (id _Nullable)objectForKeyedSubscript:(NSString *)columnName;

/** Result set object for column.

 This method allows the use of the "boxed" syntax supported in Modern Objective-C. For example, by defining this method, the following syntax is now supported:

@code
id result = rs[0];
@endcode

 This simplified syntax is equivalent to calling:

@code
id result = [rs objectForKeyedSubscript:0];
@endcode

 which is, it turns out, equivalent to calling:

@code
id result = [rs objectForColumnName:0];
@endcode

 @param columnIdx Zero-based index for column.

 @return Either @c NSNumber , @c NSString , @c NSData , or @c NSNull . If the column was @c NULL , this returns `[NSNull null]` object.
 */

- (id _Nullable)objectAtIndexedSubscript:(int)columnIdx;

/** Result set @c NSData  value for column.

 @param columnName @c NSString  value of the name of the column.

 @return Data value of the result set's column.

 @warning If you are going to use this data after you iterate over the next row, or after you close the
result set, make sure to make a copy of the data first (or just use `<dataForColumn:>`/`<dataForColumnIndex:>`)
If you don't, you're going to be in a world of hurt when you try and use the data.
 
 */

- (NSData * _Nullable)dataNoCopyForColumn:(NSString *)columnName NS_RETURNS_NOT_RETAINED;

/** Result set @c NSData  value for column.

 @param columnIdx Zero-based index for column.

 @return Data value of the result set's column.

 @warning If you are going to use this data after you iterate over the next row, or after you close the
 result set, make sure to make a copy of the data first (or just use `<dataForColumn:>`/`<dataForColumnIndex:>`)
 If you don't, you're going to be in a world of hurt when you try and use the data.

 */

- (NSData * _Nullable)dataNoCopyForColumnIndex:(int)columnIdx NS_RETURNS_NOT_RETAINED;

/** Is the column @c NULL ?
 
 @param columnIdx Zero-based index for column.

 @return @c YES if column is @c NULL ; @c NO if not @c NULL .
 */

- (BOOL)columnIndexIsNull:(int)columnIdx;

/** Is the column @c NULL ?

 @param columnName @c NSString  value of the name of the column.

 @return @c YES if column is @c NULL ; @c NO if not @c NULL .
 */

- (BOOL)columnIsNull:(NSString*)columnName;


/** Returns a dictionary of the row results mapped to case sensitive keys of the column names. 
 
 @warning The keys to the dictionary are case sensitive of the column names.
 */

@property (nonatomic, readonly, nullable) NSDictionary *resultDictionary;
 
/** Returns a dictionary of the row results
 
 @see resultDictionary
 
 @warning **Deprecated**: Please use `<resultDictionary>` instead.  Also, beware that `<resultDictionary>` is case sensitive! 
 */

- (NSDictionary * _Nullable)resultDict __deprecated_msg("Use resultDictionary instead");

///-----------------------------
/// @name Key value coding magic
///-----------------------------

/** Performs `setValue` to yield support for key value observing.
 
 @param object The object for which the values will be set. This is the key-value-coding compliant object that you might, for example, observe.

 */

- (void)kvcMagic:(id)object;

///-----------------------------
/// @name Binding values
///-----------------------------

/// Bind array of values to prepared statement.
///
/// @param array Array of values to bind to SQL statement.

- (BOOL)bindWithArray:(NSArray*)array;

/// Bind dictionary of values to prepared statement.
///
/// @param dictionary Dictionary of values to bind to SQL statement.

- (BOOL)bindWithDictionary:(NSDictionary *)dictionary;

@end

NS_ASSUME_NONNULL_END
