/*

     File: FilterAttributesController.m

 Abstract: View controller for the filter attribute editor

  Version: 1.0

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 */

#import "FilterAttributesController.h"

#import <AssetsLibrary/AssetsLibrary.h>

#import <CoreImage/CoreImage.h>

#import "CIFilter+FHAdditions.h"

#import "FilterAttributeBinding.h"

#import "SliderCell.h"

@implementation FilterAttributesController

@synthesize filter = _filter;

@synthesize screenSize;

#pragma mark - View lifecycle

- (void)_resetAction

{

    for (FilterAttributeBinding *binding in _attributeBindings)

        [binding revertToDefaultValues];

    [self.tableView reloadData];

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // create the attribute bindings

    _attributeBindings = [[NSMutableArray alloc] init];

    for (NSString *key in _filter.inputKeys)

    {

        NSDictionary *attrDict = [_filter.attributes objectForKey:key];

        if ([CIFilter isAttributeConfigurable:attrDict])

        {

            FilterAttributeBinding *binding = [[FilterAttributeBinding alloc] initWithFilter:_filter

                                                                               attributeName:key

                                                                                  dictionary:attrDict

                                                                                  screenSize:self.screenSize];

            [_attributeBindings addObject:binding];

        }

    }

    self.title = [[_filter attributes] valueForKey:kCIAttributeFilterDisplayName] ?: _filter.name;

    self.tableView.rowHeight = [SliderCell cellHeight];

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Reset"

                                                                              style:UIBarButtonItemStylePlain

                                                                             target:self

                                                                             action:@selector(_resetAction)];

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    [self.tableView reloadData];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    return YES;

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    // each input attribute is a section in the table view

    return _attributeBindings.count;

}

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

{

    if (section >= _attributeBindings.count)

        return 0;

    FilterAttributeBinding *binding = [_attributeBindings objectAtIndex:section];

    return binding.elementCount;

}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

    if (section >= _attributeBindings.count)

        return nil;

    FilterAttributeBinding *binding = [_attributeBindings objectAtIndex:section];

    return binding.elementCount>1 ? binding.title : nil;

}

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

{

    static NSString *CellIdentifier = @"Cell";

    SliderCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)

        cell = [[SliderCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

    else

        [(FilterAttributeBinding *)cell.delegate unbindSliderCell:cell];

    FilterAttributeBinding *binding = [_attributeBindings objectAtIndex:indexPath.section];

    NSUInteger elementIndex = indexPath.row;

    [binding bindSliderCell:cell toElementIndex:elementIndex];

    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    cell.delegate = binding;    

    cell.titleLabel.text = binding.elementCount>1 ? [binding elementTitleForIndex:elementIndex] : binding.title;

    cell.slider.minimumValue = binding.minElementValue;

    cell.slider.maximumValue = binding.maxElementValue;

    cell.slider.value = [binding elementValueForIndex:elementIndex];

    [cell.slider sendActionsForControlEvents:UIControlEventValueChanged];

    return cell;

}

#pragma mark - Table view delegate

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

    // disallow selection of any cell

    return nil;

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

    // disallow selection of any cell

    return;

}

@end