/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A controller used by the ATColorTableController to edit the color property.

 */

#import "ATColorTableController.h"

#import "ATTableCellView.h"

#import "ATColorView.h"

@interface ATColorTableController () <NSTableViewDelegate, NSTableViewDataSource, NSPopoverDelegate>

@property (weak) IBOutlet NSTableView *tableColorList;

@property (strong) NSColorList *colorList;

@property (strong) NSArray *colorNames;

@property (strong) NSPopover *popover;

@end

#pragma mark -

@implementation ATColorTableController

@dynamic selectedColor, selectedColorName;

+ (ATColorTableController *)sharedColorTableController {

    static ATColorTableController *gSharedColorTableController = nil;

    if (gSharedColorTableController == nil) {

        gSharedColorTableController = [[[self class] alloc] initWithNibName:@"ATColorTable" bundle:[NSBundle bundleForClass:[self class]]];

    }

    return gSharedColorTableController;

}

- (void)loadView {

    [super loadView];

    _colorList = [NSColorList colorListNamed:@"Crayons"];

    _colorNames = self.colorList.allKeys;

    self.tableColorList.intercellSpacing = NSMakeSize(3, 3);

    self.tableColorList.target = self;

    self.tableColorList.action = @selector(tableViewAction:);

}

- (NSColor *)selectedColor {

    NSString *name = self.selectedColorName;

    if (name != nil) {

        return [self.colorList colorWithKey:name];

    } else {

        return nil;

    }

}

- (NSString *)selectedColorName {

    if (self.tableColorList.selectedRow != -1) {

        return self.colorNames[self.tableColorList.selectedRow];

    } else {

        return nil;

    }

}

- (void)_selectColor:(NSColor *)color {

    // Search for that color in our list.

    NSInteger row = 0;

    for (NSString *name in self.colorNames) {

        NSColor *colorInList = [self.colorList colorWithKey:name];

        if ([color isEqual:colorInList]) {

            break;

        }

        row++;

    }    

    // This is done in an animated fashion

    if (row != -1) {

        [self.tableColorList scrollRowToVisible:row];

        [[self.tableColorList animator] selectRowIndexes:[NSIndexSet indexSetWithIndex:row] byExtendingSelection:NO];

    } else {

        [self.tableColorList scrollRowToVisible:0];

        [[self.tableColorList animator] selectRowIndexes:[NSIndexSet indexSet] byExtendingSelection:NO];

    }

}

- (void)makePopoverIfNeeded {

    if (self.popover == nil) {

        // Create and setup our window.

        _popover = [[NSPopover alloc] init];

        // The popover retains us and we retain the popover. We drop the popover whenever it is closed to avoid a cycle.

        self.popover.contentViewController = self;

        self.popover.behavior = NSPopoverBehaviorTransient;

        self.popover.delegate = self;

    }

}

- (void)editColor:(NSColor *)color withPositioningView:(NSView *)positioningView {

    [self makePopoverIfNeeded];

    [self _selectColor:color];

    [self.popover showRelativeToRect:positioningView.bounds ofView:positioningView preferredEdge:NSMinYEdge];

}

- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {

    return self.colorNames.count;

}

- (id)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {

    NSString *name = self.colorNames[row];

    NSColor *color = [self.colorList colorWithKey:name];

    // In IB, the TableColumn's identifier is set to "Automatic".

    // The ATTableCellView's is also set to "Automatic". IB then keeps the two in sync,

    // and we don't have to worry about setting the identifier.

    //

    ATTableCellView *result = [tableView makeViewWithIdentifier:tableColumn.identifier owner:nil];

    result.colorView.backgroundColor = color;

    result.colorView.drawBorder = YES;

    result.subTitleTextField.stringValue = name;

    return result;

}

- (void)tableViewAction:(id)sender {

    [self.popover close];

    if ([self.delegate respondsToSelector:@selector(colorTableController:didChooseColor:named:)]) {

        [self.delegate colorTableController:self didChooseColor:self.selectedColor named:self.selectedColorName];

    }

}

- (void)popoverDidClose:(NSNotification *)notification {

    // Free the popover to avoid a cycle.

    // We could also just break the contentViewController property, and reset it when we show the popover.

    _popover = nil;

}

@end