/*

     File: FilterListController.m

 Abstract: The view controller of the active filter list table view

  Version: 1.0

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 */

#import "FilterListController.h"

#import "CIFilter+FHAdditions.h"

#import "FilterAttributesController.h"

@implementation FilterListController

@synthesize delegate = _delegate;

@synthesize filterStack = _filterStack;

@synthesize addFilterPopoverController = _addFilterPopoverController;

@synthesize addFilterNavigationController = _addFilterNavigationController;

@synthesize screenSize;

#pragma mark - View lifecycle

- (void)_dismissAction

{

    [self.delegate filterListEditorDidDismiss];

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    AddFilterController *addFilterController = [[AddFilterController alloc] initWithStyle:UITableViewStylePlain];

    addFilterController.filterStack = _filterStack;

    addFilterController.delegate = self;

    addFilterController.contentSizeForViewInPopover = CGSizeMake(480.0, 320.0);

    self.addFilterNavigationController = [[UINavigationController alloc] initWithRootViewController:addFilterController];

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad)

        self.addFilterPopoverController = [[UIPopoverController alloc] initWithContentViewController:self.addFilterNavigationController];

    _addFilterButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd

                                                                         target:self

                                                                         action:@selector(addAction)];

    self.navigationItem.leftBarButtonItem = _addFilterButtonItem;

    if (([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone))

        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone

                                                                                               target:self

                                                                                               action:@selector(_dismissAction)];

    else

        self.navigationItem.rightBarButtonItem = self.editButtonItem;

    self.title = @"Filters";

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    // enable "Edit" button if there is one or more item in this list

    if (([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad))

        self.navigationItem.rightBarButtonItem.enabled = (_filterStack.activeFilters.count > 0);

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    return 1;

}

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

{

    return _filterStack.activeFilters.count;

}

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

{

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)

        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];

    CIFilter *filter = [_filterStack.activeFilters objectAtIndex:indexPath.row];

    NSString *displayName = [[filter attributes] valueForKey:kCIAttributeFilterDisplayName];

    cell.textLabel.text = displayName;

    cell.detailTextLabel.text = [filter isSourceFilter] ? nil : [filter name];

    if ([filter onlyRequiresInputImages])

        cell.accessoryType = UITableViewCellAccessoryNone;

    else

        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    cell.selectionStyle = UITableViewCellSelectionStyleBlue;

    cell.showsReorderControl = NO;

    return cell;

}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath

{

    // might be nice to have a yellow background color for the cell

    // if the item is not in use in the graph.

    // For example if the stack just contains two images.

    // The logic for this is a bit tricky though so it is left as an exercise.

//    CIFilter *filter = [_filterStack.activeFilters objectAtIndex:indexPath.row];

//    if (filter.isUnused)

//        cell.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.75 alpha:1.0];

}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath

{

    // Only allow the last filter to be edited

    return (indexPath.row == _filterStack.activeFilters.count - 1);

}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath

{

    if (editingStyle == UITableViewCellEditingStyleDelete)

    {

        [_filterStack removeLastFilter]; // only the last filter is deletable

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

        if (self.editing && _filterStack.activeFilters.count == 0)

        {

            self.editing = NO;

            self.editButtonItem.enabled = NO;

        }

    }

}

#pragma mark - Table view delegate

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

{

    CIFilter *filter = [_filterStack.activeFilters objectAtIndex:indexPath.row];

    if ([filter onlyRequiresInputImages])

    {

        [self.tableView deselectRowAtIndexPath:indexPath animated:YES];

        return;

    }

    FilterAttributesController *controller = [[FilterAttributesController alloc] initWithStyle:UITableViewStyleGrouped];

    controller.filter = filter;

    controller.contentSizeForViewInPopover = self.contentSizeForViewInPopover;

    controller.screenSize = self.screenSize;

    [self.navigationController pushViewController:controller animated:YES];

}

#pragma mark - Private methods

- (void)addAction

{

    AddFilterController *controller = [[AddFilterController alloc] initWithStyle:UITableViewStylePlain];

    controller.filterStack = self.filterStack;

    controller.delegate = self;

    controller.contentSizeForViewInPopover = self.contentSizeForViewInPopover;

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)

    {

        [[UIApplication sharedApplication] setStatusBarHidden:NO

                                                withAnimation:UIStatusBarAnimationSlide];

        [self presentViewController:_addFilterNavigationController animated:YES completion:nil];

    }

    else

    {

        [_addFilterPopoverController presentPopoverFromBarButtonItem:_addFilterButtonItem

                                            permittedArrowDirections:UIPopoverArrowDirectionUp

                                                            animated:YES];

    }

}

#pragma mark - AddFilterController delegate method

- (void) didAddFilter:(CIFilter *)filter

{

    [self.tableView reloadData];

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)

    {

        [_addFilterNavigationController dismissViewControllerAnimated:YES completion:nil];

    }

    else

    {

        if ([_addFilterPopoverController isPopoverVisible])

            [_addFilterPopoverController dismissPopoverAnimated:YES];

    }

}

@end