OffersTableViewController.m

/* Copyright (c) 2013 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "ExtraPropertyUITableViewCell.h"
#import "GTLShoppingassistant.h"
#import "GTMHTTPFetcher.h"
#import "OffersTableViewController.h"
#import "ViewHelper.h"


@implementation OffersTableViewController
@synthesize storeName = _storeName;
@synthesize offers = _offers;
@synthesize recommendations = _recommendations;
@synthesize notifications = _notifications;

enum {
    kOffers = 0,
    kRecommendations,
    kNumberOfSections
};

- (void)setOffers:(NSArray *)array {
  if (array != _offers) {
    _offers = array;
  
    if (self.tableView.window) {
      [self.tableView reloadData];
      
      // Remove visual spinner if both recommendation and offers are set
      UINavigationItem *navigationItem = self.navigationItem;
      if (self.recommendations && navigationItem.rightBarButtonItem) {
        navigationItem.rightBarButtonItem = nil;
      }
    }
  }
}

- (void)setRecommendations:(NSArray *)array {
  if (array != _recommendations) {
    _recommendations = array;
  
    if (self.tableView.window) {
      [self.tableView reloadData];

      // Remove visual spinner if both recommendation and offers are set
      UINavigationItem *navigationItem = self.navigationItem;
      if (self.offers && navigationItem.rightBarButtonItem) {
        navigationItem.rightBarButtonItem = nil;
      }
    }
  }
}

#pragma mark - UITableVew data source for goodies

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
  return kNumberOfSections;
}

- (NSInteger)tableView:(UITableView *)tableView
 numberOfRowsInSection:(NSInteger)section {
  NSUInteger count = 0;
  if (section == kOffers) {
    count = [self.offers count];
    if (count < NSIntegerMax) {
      return (NSInteger) count;
    }
  } else if (section == kRecommendations) {
    count = [self.recommendations count];
    if (count < NSIntegerMax) {
      return (NSInteger) count;
    }
  }
    
  return 0;
}

- (NSString *)tableView:(UITableView *)tableView
titleForHeaderInSection:(NSInteger)section {
  if (section == kOffers) {
    return @"Offers";
  } else if (section == kRecommendations) {
    return @"Recommendations";
  }
  
  return nil;
}

- (void)provideBlankCellImage:(UITableView *)tableView
                    indexPath:(NSIndexPath *)indexPath
                    tableCell:(UITableViewCell *)cell {
  CGSize imageSize = CGSizeMake(kDefaultCellImageWidth,
                                [self tableView:tableView
                        heightForRowAtIndexPath:indexPath]);
  UIImage *cellImage = [UIImage imageNamed:@"White.png"];
  cell.imageView.image = [ViewHelper resizedImageWithImage:cellImage
                                                    toSize:imageSize];
}

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  static NSString *const kCellIdentifier = @"Discount with Description";
  ExtraPropertyUITableViewCell *cell =
      [tableView dequeueReusableCellWithIdentifier:kCellIdentifier
                                      forIndexPath:indexPath];
  if (!cell) {
    cell = [[ExtraPropertyUITableViewCell alloc]
                 initWithStyle:UITableViewCellStyleValue2
               reuseIdentifier:kCellIdentifier];
  }
    
  if (indexPath.section == kOffers) {
    // Offer section
    GTLShoppingassistantOffer *offer =
        [self.offers objectAtIndex:indexPath.row];
    
    cell.textLabel.text = offer.title;
    cell.textLabel.textColor =
        [UIColor colorWithRed:1.0 green:0.51 blue:0 alpha:1.0];
    cell.detailTextLabel.numberOfLines = 0;
    cell.detailTextLabel.lineBreakMode = NSLineBreakByWordWrapping;
    cell.detailTextLabel.text = offer.descriptionProperty;
    
    [self provideBlankCellImage:tableView indexPath:indexPath tableCell:cell];
    cell.indexPath = indexPath;    
    [self configureCellImage:tableView
                   tableCell:cell
              imageURLString:offer.imageUrl
                   indexPath:indexPath];
  
  } else if (indexPath.section == kRecommendations) {
    // Recommendation section
    GTLShoppingassistantRecommendation *recommendation =
        [self.recommendations objectAtIndex:indexPath.row];
        
    cell.textLabel.text = recommendation.title;
    cell.textLabel.textColor =
        [UIColor colorWithRed:0.6 green:0.22 blue:0 alpha:1.0];
    cell.detailTextLabel.numberOfLines = 0;
    cell.detailTextLabel.lineBreakMode = NSLineBreakByWordWrapping;
    cell.detailTextLabel.text = recommendation.descriptionProperty;
    
    [self provideBlankCellImage:tableView indexPath:indexPath tableCell:cell];
    cell.indexPath = indexPath;    
    [self configureCellImage:tableView
                   tableCell:cell
              imageURLString:recommendation.imageUrl
                   indexPath:indexPath];
  }
    
  return cell;
}

- (CGFloat)tableView:(UITableView *)tableView
    heightForRowAtIndexPath:(NSIndexPath *)indexPath {
  if (indexPath.section == kOffers) {
    // Offer section
    GTLShoppingassistantOffer *offer =
        [self.offers objectAtIndex:indexPath.row];
    return [ViewHelper heightForCellDetailWithLineCount:
               offer.descriptionProperty.length];
    
  } else if (indexPath.section == kRecommendations) {
    // Recommendation section
    GTLShoppingassistantRecommendation *recommendation =
        [self.recommendations objectAtIndex:indexPath.row];
    NSUInteger length = recommendation.descriptionProperty.length;
    return [ViewHelper heightForCellDetailWithLineCount:length];
  }
    
  return kDefaultCellHeight;
}

- (void)configureCellImage:(UITableView *)tableView
                 tableCell:(ExtraPropertyUITableViewCell *)cell
            imageURLString:(NSString *)imageURLString
                 indexPath:(NSIndexPath *)indexPath {
  GTMHTTPFetcher *fetchImage =
      [GTMHTTPFetcher fetcherWithURLString:imageURLString];
  
  [fetchImage beginFetchWithCompletionHandler:
      ^(NSData *data, NSError *error) {
        NSLog(@"Fetch image callback: %@ %@", indexPath, cell);
        UIImage *fetchedImage = nil;
    
        if (error) {
          // It's not wise to show error message to users for each image
          // fetching failure, but we should log for debugging.
          NSLog(@"%@", error);
        } else {
          if ([data length] > 0) {
            fetchedImage = [[UIImage alloc] initWithData:data];
          }
        }

        // Attempt to display the image only when the fetched image is valid
        if (fetchedImage) {
          // Display the image only when the recyled cell is corresponding to
          // the matching indexPath
          if ([indexPath isEqual:cell.indexPath]) {
            int height = [self tableView:tableView
                 heightForRowAtIndexPath:indexPath];
            CGSize imageSize = CGSizeMake(kDefaultCellImageWidth, height);
            UIImage *image = [ViewHelper resizedImageWithImage:fetchedImage
                                                        toSize:imageSize];
            // Set the cell to display the image
            cell.imageView.image = image;
          }
        }
      }];
}

@end