/*

Copyright (C) 2015 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

Abstract:

Provides the table view data for the elements sorted by atomic symbol.

*/

#import "ElementsSortedBySymbolDataSource.h"

#import "PeriodicElements.h"

#import "AtomicElementTableViewCell.h"

@implementation ElementsSortedBySymbolDataSource

// protocol methods for "ElementsDataSourceProtocol"

// return the data used by the navigation controller and tab bar item

- (NSString *)navigationBarName {

    return @"Sorted by Atomic Symbol";

}

- (NSString *)name {

    return @"Symbol";

}

- (UIImage *)tabBarImage {

    return [UIImage imageNamed:@"symbol_gray.png"];

}

// atomic number is displayed in a plain style tableview

- (UITableViewStyle)tableViewStyle {

    return UITableViewStylePlain;

}

// return the atomic element at the index in the sorted by symbol array

- (AtomicElement *)atomicElementForIndexPath:(NSIndexPath *)indexPath {

    return [[PeriodicElements sharedPeriodicElements] elementsSortedBySymbol][indexPath.row];

}

#pragma mark - UITableViewDataSource

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    AtomicElementTableViewCell *cell =

        (AtomicElementTableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"AtomicElementTableViewCell"];

    // set the element for this cell as specified by the datasource. The atomicElementForIndexPath: is declared

    // as part of the ElementsDataSource Protocol and will return the appropriate element for the index row

    //

    cell.element = [self atomicElementForIndexPath:indexPath];

    return cell;

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    // this table has only one section

    return 1;

}

- (NSInteger)tableView:(UITableView *)tableView  numberOfRowsInSection:(NSInteger)section {

    // get the shared elements object

    // ask for, and return, the number of elements in the array of elements sorted by symbol

    return [[[PeriodicElements sharedPeriodicElements] elementsSortedBySymbol] count];

}

@end