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//
// EGORefreshTableHeaderView.m
// Demo
//
// Created by Devin Doty on 10/14/09October14.
// Copyright 2009 enormego. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#import "EGORefreshTableHeaderView.h"


#define TEXT_COLOR [UIColor colorWithRed:87.0/255.0 green:108.0/255.0 blue:137.0/255.0 alpha:1.0]
#define FLIP_ANIMATION_DURATION 0.18f


@interface EGORefreshTableHeaderView (Private)
- (void)setState:(EGOPullRefreshState)aState;
@end

@implementation EGORefreshTableHeaderView

@synthesize delegate=_delegate;


- (id)initWithFrame:(CGRect)frame arrowImageName:(NSString *)arrow textColor:(UIColor *)textColor {
    if((self = [super initWithFrame:frame])) {

self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
self.backgroundColor = [UIColor colorWithRed:226.0/255.0 green:231.0/255.0 blue:237.0/255.0 alpha:1.0];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, frame.size.height - 30.0f, self.frame.size.width, 20.0f)];
label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
label.font = [UIFont systemFontOfSize:12.0f];
label.textColor = textColor;
label.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
label.shadowOffset = CGSizeMake(0.0f, 1.0f);
label.backgroundColor = [UIColor clearColor];
label.textAlignment = NSTextAlignmentCenter;
[self addSubview:label];
_lastUpdatedLabel=label;
[label release];

label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, frame.size.height - 48.0f, self.frame.size.width, 20.0f)];
label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
label.font = [UIFont boldSystemFontOfSize:13.0f];
label.textColor = textColor;
label.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
label.shadowOffset = CGSizeMake(0.0f, 1.0f);
label.backgroundColor = [UIColor clearColor];
label.textAlignment = NSTextAlignmentCenter;
[self addSubview:label];
_statusLabel=label;
[label release];

CALayer *layer = [CALayer layer];
layer.frame = CGRectMake(25.0f, frame.size.height - 65.0f, 30.0f, 55.0f);
layer.contentsGravity = kCAGravityResizeAspect;
layer.contents = (id)[UIImage imageNamed:arrow].CGImage;
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
layer.contentsScale = [[UIScreen mainScreen] scale];
}
#endif

[[self layer] addSublayer:layer];
_arrowImage=layer;

UIActivityIndicatorView *view = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
view.frame = CGRectMake(25.0f, frame.size.height - 38.0f, 20.0f, 20.0f);
[self addSubview:view];
_activityView = view;
[view release];


[self setState:EGOOPullRefreshNormal];

    }

    return self;

}

- (id)initWithFrame:(CGRect)frame {
  return [self initWithFrame:frame arrowImageName:@"blueArrow.png" textColor:TEXT_COLOR];
}

#pragma mark -
#pragma mark Setters

- (void)refreshLastUpdatedDate {

if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceLastUpdated:)]) {

NSDate *date = [_delegate egoRefreshTableHeaderDataSourceLastUpdated:self];

[NSDateFormatter setDefaultFormatterBehavior:NSDateFormatterBehaviorDefault];
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateStyle:NSDateFormatterShortStyle];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];

_lastUpdatedLabel.text = [NSString stringWithFormat:@"Last Updated: %@", [dateFormatter stringFromDate:date]];
[[NSUserDefaults standardUserDefaults] setObject:_lastUpdatedLabel.text forKey:@"EGORefreshTableView_LastRefresh"];
[[NSUserDefaults standardUserDefaults] synchronize];

} else {

_lastUpdatedLabel.text = nil;

}

}

- (void)setState:(EGOPullRefreshState)aState{

switch (aState) {
case EGOOPullRefreshPulling:

_statusLabel.text = NSLocalizedString(@"Release to refresh...", @"Release to refresh status");
[CATransaction begin];
[CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
_arrowImage.transform = CATransform3DMakeRotation((M_PI / 180.0) * 180.0f, 0.0f, 0.0f, 1.0f);
[CATransaction commit];

break;
case EGOOPullRefreshNormal:

if (_state == EGOOPullRefreshPulling) {
[CATransaction begin];
[CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
_arrowImage.transform = CATransform3DIdentity;
[CATransaction commit];
}

_statusLabel.text = NSLocalizedString(@"Pull down to refresh...", @"Pull down to refresh status");
[_activityView stopAnimating];
[CATransaction begin];
[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
_arrowImage.hidden = NO;
_arrowImage.transform = CATransform3DIdentity;
[CATransaction commit];

[self refreshLastUpdatedDate];

break;
case EGOOPullRefreshLoading:

_statusLabel.text = NSLocalizedString(@"Loading...", @"Loading Status");
[_activityView startAnimating];
[CATransaction begin];
[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
_arrowImage.hidden = YES;
[CATransaction commit];

break;
default:
break;
}

_state = aState;
}


#pragma mark -
#pragma mark ScrollView Methods

- (void)egoRefreshScrollViewDidScroll:(UIScrollView *)scrollView {

if (_state == EGOOPullRefreshLoading) {

CGFloat offset = MAX(scrollView.contentOffset.y * -1, 0);
offset = MIN(offset, 60);
scrollView.contentInset = UIEdgeInsetsMake(offset, 0.0f, 0.0f, 0.0f);

} else if (scrollView.isDragging) {

BOOL _loading = NO;
if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceIsLoading:)]) {
_loading = [_delegate egoRefreshTableHeaderDataSourceIsLoading:self];
}

if (_state == EGOOPullRefreshPulling && scrollView.contentOffset.y > -65.0f && scrollView.contentOffset.y < 0.0f && !_loading) {
[self setState:EGOOPullRefreshNormal];
} else if (_state == EGOOPullRefreshNormal && scrollView.contentOffset.y < -65.0f && !_loading) {
[self setState:EGOOPullRefreshPulling];
}

if (scrollView.contentInset.top != 0) {
scrollView.contentInset = UIEdgeInsetsZero;
}

}

}

- (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView {

BOOL _loading = NO;
if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceIsLoading:)]) {
_loading = [_delegate egoRefreshTableHeaderDataSourceIsLoading:self];
}

if (scrollView.contentOffset.y <= - 65.0f && !_loading) {

if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDidTriggerRefresh:)]) {
[_delegate egoRefreshTableHeaderDidTriggerRefresh:self];
}

[self setState:EGOOPullRefreshLoading];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.2];
scrollView.contentInset = UIEdgeInsetsMake(60.0f, 0.0f, 0.0f, 0.0f);
[UIView commitAnimations];

}

}

- (void)egoRefreshScrollViewDataSourceDidFinishedLoading:(UIScrollView *)scrollView {

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:.3];
[scrollView setContentInset:UIEdgeInsetsMake(0.0f, 0.0f, 0.0f, 0.0f)];
[UIView commitAnimations];

[self setState:EGOOPullRefreshNormal];

}


#pragma mark -
#pragma mark Dealloc

- (void)dealloc {

_delegate=nil;
_activityView = nil;
_statusLabel = nil;
_arrowImage = nil;
_lastUpdatedLabel = nil;
    [super dealloc];
}


@end
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