/*

File: OpenURLPanel.m

Abstract: Contains code to handle opening URLs in our application.

Version: 1.0

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*/

#import "OpenURLPanel.h"

    // user defaults keys

#define kUserDefaultURLsKey @"UserDefaultURLsKey"

    // maximum urls

#define kMaximumURLs        15

@implementation OpenURLPanel

static OpenURLPanel *openURLPanel = nil;

    // class methods

+ (id)openURLPanel

{

    if (openURLPanel == nil)

        openURLPanel = [[self alloc] init];

    return openURLPanel;

}

- (id)init

{

    [super init];

    // init

    [self setURLArray:[NSMutableArray arrayWithCapacity:10]];

    // listen for app termination notifications

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(writeURLs:) name:NSApplicationWillTerminateNotification object:NSApp];

    return self;

}

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [self setURLArray:nil];

    [super dealloc];

}

    // getters

- (NSString *)urlString

{

    NSString *urlString = nil;

    // get the url

    urlString = [mUrlComboBox stringValue];

    if (urlString == nil)

        urlString = [mUrlComboBox objectValueOfSelectedItem];

    if ([urlString length] == 0)

        urlString = nil;

    return urlString;

}

- (NSURL *)url

{

    NSURL       *url = nil;

    NSString    *urlString;

    // get the url

    urlString = [self urlString];

    if (urlString)

        url = [NSURL URLWithString:urlString];

    return url;

}

    // setters

- (void)setURLArray:(NSMutableArray *)urlLArray

{

    [urlLArray retain];

    [mUrlArray retain];

    mUrlArray = urlLArray;

}

    // delegates

- (void)awakeFromNib

{

    NSArray *urls;

    // restore the previous urls

    urls = [[NSUserDefaults standardUserDefaults] objectForKey:kUserDefaultURLsKey];

    [mUrlArray addObjectsFromArray:urls];

    if (urls)

        [mUrlComboBox addItemsWithObjectValues:urls];

}

    // notifications

- (void)writeURLs:(NSNotification *)notification

{

    NSUserDefaults *userDefaults;

    if ([mUrlArray count])

    {

        // init

        userDefaults = [NSUserDefaults standardUserDefaults];

        // write out the urls

        [userDefaults setObject:mUrlArray forKey:kUserDefaultURLsKey];

        [userDefaults synchronize];

    }

}

    // actions

- (IBAction)doOpenURL:(id)sender

{

    NSString    *urlString;

    NSURL       *url;

    BOOL        informDelegate = YES;

    IMP         callback;

    if ([sender tag] == NSOKButton) {

        // validate the URL

        url = [self url];

        urlString = [self urlString];

        if (url) {

            // save the url

            if (![mUrlArray containsObject:urlString]) {

                // save the url

                [mUrlArray addObject:urlString];

                // add the url to the combo box

                [mUrlComboBox addItemWithObjectValue:urlString];

                // remove the oldest url if the maximum has been exceeded

                if ([mUrlArray count] > kMaximumURLs) {

                    [mUrlArray removeObjectAtIndex:0];

                    [mUrlComboBox removeItemAtIndex:0];

                }

            } else {

                // move the url to the bottom of the list

                [mUrlArray removeObject:urlString];

                [mUrlArray addObject:urlString];

                [mUrlComboBox removeItemWithObjectValue:urlString];

                [mUrlComboBox addItemWithObjectValue:urlString];

            }

        } else {

            if (mIsSheet)

                NSRunAlertPanel(@"Invalid URL", @"The URL is not valid.", nil, nil, nil);

            else

                NSBeginAlertSheet(@"Invalid URL", nil, nil, nil, mPanel, nil, nil, nil, nil, @"The URL is not valid.");

            informDelegate = NO;

        }

    }

    // inform the delegate

    if (informDelegate && mDelegate && mDidEndSelector) {

        callback = [mDelegate methodForSelector:mDidEndSelector];

        callback(mDelegate, mDidEndSelector, self, [sender tag], mContextInfo);

    }

}

    // methods

- (void)beginSheetWithWindow:(NSWindow *)window delegate:(id)delegate didEndSelector:(SEL)didEndSelector contextInfo:(void *)contextInfo

{

    // will this run as a sheet

    mIsSheet = (window ? YES : NO);

    // save the delegate, did end selector, and context info

    mDelegate = delegate;

    mDidEndSelector = (didEndSelector);

    mContextInfo = contextInfo;

    // load the bundle (if necessary)

    if (mPanel == nil)

        [NSBundle loadNibNamed:@"OpenURLPanel" owner:self];

    // start the sheet (or window)

    [NSApp beginSheet:mPanel modalForWindow:window modalDelegate:nil didEndSelector:nil contextInfo:nil];

}

- (void)close

{

    // close it down

    [NSApp endSheet:mPanel];

    [mPanel close];

}

@end