/*

File: FeedPicker.m

Abstract: Use the PubSub framework to create a simple RSS news reader.

Version: 1.0

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*/

#import "FeedPicker.h"

#import <PubSub/PubSub.h>

#import <ApplicationServices/ApplicationServices.h>

static NSString* NameOfAppWithBundleID( NSString* bundleID )

{

    FSRef appRef;

    OSStatus err = LSFindApplicationForInfo(kLSUnknownType,(CFStringRef)bundleID,NULL,

                                            &appRef,NULL);

    if( ! err ) {

        NSString *name = nil;

        err = LSCopyDisplayNameForRef(&appRef,(CFStringRef*)&name);

        if( ! err )

            return [name autorelease];

    }

    return nil;

}

static NSURL* SmartURLFromString( NSString *str, NSArray *allowedSchemes )

{

    NSURL *url = [NSURL URLWithString: str];

    if( url ) {

        NSString *scheme = [url scheme];

        if( scheme == nil ) {

            str = [@"http://" stringByAppendingString: str];

            url = [NSURL URLWithString: str];

            scheme = [url scheme];

        }

        if( !allowedSchemes || [allowedSchemes containsObject: scheme] )

            if( [[url host] length] && [url path]!=nil )

                return url;

    }

    return nil;

}

@implementation FeedPicker

@synthesize selectedFeedURL = _selectedFeedURL;

- (void) setTarget: (id)target action: (SEL)action

{

    _target = target;

    _action = action;

}

- (void) open: (id)sender

{

    _clientIdentifiers = [[PSClient allClientBundleIdentifiers] mutableCopy];

    [_clientIdentifiers removeObject: [[PSClient applicationClient] signature]];

    [_browser setDoubleAction: @selector(_rowDoubleClicked:)];

    [_browser reloadColumn: 0];

    [_panel center];

    [_panel makeKeyAndOrderFront: self];

}

- (NSURL*) selectedFeedURL

{

    return SmartURLFromString([_URLField stringValue],

                              [NSArray arrayWithObjects: @"http",@"https",@"file",@"feed",nil]);

}

- (void) setSelectedFeedURL: (NSURL*)url

{

    [_URLField setObjectValue: url];

}

- (BOOL) _validateURL

{

    // Grab the new url from the text field in the sheet

    // If the URL's not valid, eep, and prevent the sheet from closing, so that the user has

    // a chance to correct their input.

    if( self.selectedFeedURL )

        return true;

    else {

        [_panel makeFirstResponder: _URLField];

        NSBeep();

        return false;

    }

}

- (IBAction) dismiss: (id)sender

{

    if( sender == _cancelButton )

        self.selectedFeedURL = nil;

    else if( ! [self _validateURL] )

        return;

    [_panel close];

}

- (BOOL) windowShouldClose: (id)sender

{

    // Close box is same as Cancel.

    self.selectedFeedURL = nil;

    return YES;

}

- (void) windowWillClose: (NSNotification*)n

{

    _clientIdentifiers = nil;

    // Tell target we're done

    [_target performSelector: _action withObject: self];

}

static NSInteger compareFeedTitles( id a, id b, void* context )

{

    NSString *aTitle = [a title] ?: [[a URL] absoluteString];

    NSString *bTitle = [b title] ?: [[b URL] absoluteString];

    return [aTitle localizedCaseInsensitiveCompare: bTitle];

}

- (void)browser:(NSBrowser *)browser createRowsForColumn:(NSInteger)column inMatrix:(NSMatrix *)matrix

{

    int i=0;

    NSString *bundleID, *name;

    NSBrowserCell *cell;

    if( column == 0 ) {

        [matrix renewRows: [_clientIdentifiers count] columns: 1];

        for( bundleID in _clientIdentifiers ) {

            name = NameOfAppWithBundleID(bundleID);

            if( ! name )

                name = bundleID;

            cell = [matrix cellAtRow: i++ column: 0];

            [cell setStringValue: name];

            [cell setLeaf: NO];

        }

    } else {

        int sel = [browser selectedRowInColumn: 0];

        bundleID = [_clientIdentifiers objectAtIndex: sel];

        NSArray *feeds = [[PSClient clientForBundleIdentifier: bundleID] feeds];

        feeds = [feeds sortedArrayUsingFunction: &compareFeedTitles context: NULL];

        [matrix renewRows: [feeds count] columns: 1];

        for( PSFeed *feed in feeds ) {

            name = [feed title];

            if( ! name )

                name = [[feed URL] absoluteString];

            cell = [matrix cellAtRow: i++ column: 0];

            [cell setStringValue: name];

            [cell setLeaf: YES];

            [cell setRepresentedObject: [feed URL]];

        }

    }

}

- (IBAction) rowSelected: (id)sender

{

    NSBrowserCell *cell = [_browser selectedCellInColumn: 1];

    [_URLField setObjectValue: [cell representedObject]];

    [_okButton setEnabled: (self.selectedFeedURL != nil)];

    NSLog(@"FeedPicker: selected <%@>",self.selectedFeedURL);

}

- (IBAction) _rowDoubleClicked: (id)sender

{

    if( self.selectedFeedURL )

        [self dismiss: self];

    else

        NSBeep();

}

- (void) controlTextDidChange: (NSNotification*)n

{

    if( [n object] == _URLField ) {

        // We shouldn't ask for the field's stringValue here, because this gets called on

        // every keystroke, and if the user's in the middle of typing a multi-key sequence

        // (like in a Japanese input method) the -stringValue method will abort the sequence.

        // Instead, just look at the field editor's text directly to see if it's non-empty.

        NSTextView *fieldEditor = [[n userInfo] objectForKey: @"NSFieldEditor"];

        [_okButton setEnabled: [[fieldEditor textStorage] length] > 0];

    }

}

@end