/*

     File: Controller.m 

 Abstract: Main window's controller. 

  Version: 1.1 

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 expressly stated in this notice, no other rights or licenses, express or 

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 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE 

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 

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 */

#import "Controller.h"

@implementation Controller

    /* tell the compiler to synthasize the property accessors

    for our instance variables and IBOutlets. */

@synthesize myWindow, workflowView, workflowTable, workflowController, tableContent;

@synthesize workflows, runningWorkflow;

    /* display the selected workflow. */

- (BOOL)displaySelectedWorkflow {

        /* get the selected row from the workflow table. */

    NSUInteger theRow = [workflowTable selectedRow];

      /* if there is a selection and we are not running

      the selected workflow, then we can display the

      workflow selected in the list. */

    if ( theRow != -1 && ! self.runningWorkflow ) {

            /* retrieve the first item in the selection */

        NSDictionary* selectedEntry = [[tableContent arrangedObjects] objectAtIndex: theRow];

            /* retrieve the selected application from our list of applications. */

        AMWorkflow* selectedWorkflow =

            (AMWorkflow*) [selectedEntry objectForKey:@"workflow"];

            /* ask the AMWorkflowController to display the selected workflow */

        [workflowController setWorkflow: selectedWorkflow];

            /* set the window title */

        [myWindow setTitle: (NSString*) [selectedEntry objectForKey:@"name"]];

        return YES;

    } else {

        return NO;

    }

}

    /* awakeFromNib is called after our MainMenu.nib file has been loaded

    and the main window is ready for use.  Here, we finish initializing

    our content for display in the window.  */

- (void)awakeFromNib {

        /* we're only using the AMWorkflowView for display */

    [workflowView setEditable: NO]; 

        /* set up the data for NSTableView.  We'll store a list of

        NSDictonary records each containing some information about the

        workflow.  We'll display the name of the workflow's file in the

        window.  */

        /* set up an array for storing the table information */

    NSMutableArray *theWorkflows = [[[NSMutableArray alloc] initWithCapacity:20] autorelease];

        /* retrieve a list of all of the workflows stored in the application's

        resourced folder. */

    NSArray *workflowPaths = [[NSBundle mainBundle]

        pathsForResourcesOfType:@"workflow" inDirectory:@"workflows"];

        /* iterate through the paths, adding them to our table information

        as we go.  */

    for ( NSString* nthWorkflowPath in workflowPaths ) {

        NSError *wfError = nil;

            /* convert the path into an URL */

        NSURL* nthWorkflowURL = [NSURL fileURLWithPath:nthWorkflowPath isDirectory:NO];

            /* allocate and initialize the workflow */

        AMWorkflow* nthWorkflow = [(AMWorkflow *)[AMWorkflow alloc] initWithContentsOfURL:nthWorkflowURL error:&wfError];

        if ( nthWorkflow ) {

                /* calculate the file name without path or extension */

            NSString* nthFileName = [nthWorkflowURL lastPathComponent];

            NSString* nthDisplayName = [nthFileName stringByDeletingPathExtension];

                /* add the workflow to the list */

            [theWorkflows addObject:

                [NSDictionary dictionaryWithObjectsAndKeys:

                    nthDisplayName, @"name", /* name displayed in list */

                    nthWorkflowPath, @"path", /* complete path to the bundle */

                    nthWorkflow, @"workflow", /* initialized AMWorkflow */

                    nil]];

        }

        [nthWorkflow release];

    }

        /* set the workflows */

    self.workflows = theWorkflows;

        /* if there are any workflows in the list, then select and display the first one */

    if ([self.workflows count] > 0 ) {

        [workflowTable selectRowIndexes:

                [NSIndexSet indexSetWithIndex:0] byExtendingSelection:NO];

        [self displaySelectedWorkflow];

    }

}

    /* NSApplication delegate method - for convenience. We have set the

    File's Owner's delegate to our Controller object in the MainMenu.nib file. */

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {

    return YES;

}

    /* NSTableView delegate methods.

    We have set our controller object as the NSTableView's delegate in the MainMenu.nib file.  */

    /* selectionShouldChangeInTableView: is called when the user has clicked in the

    table view in a way that will cause the selection to change.  This method allows us

    to decide if we would like to allow the selection to change and the response

    we return depends on if we are running a selection - we don't allow the selection

    to change while a workflow is running. */ 

- (BOOL)selectionShouldChangeInTableView:(NSTableView *)tableView {

        /* if the current selected workflow is running, don't change the selection. */

    if ( self.runningWorkflow ) {

            /* display an alert explaining why the selection cannot be changed. */

            /* get the name of the action that is running now. */

        NSString* selectedWorkflow =

            (NSString*) [(NSDictionary*)

                [[tableContent arrangedObjects] objectAtIndex: [workflowTable selectedRow]] objectForKey:@"name"];

            /* display a modal sheet explaining why the selection cannot be changed. */

        NSBeginInformationalAlertSheet(

                [NSString stringWithFormat:@"The '%@' action is running.", selectedWorkflow],

                @"OK", nil, nil, myWindow, nil, nil, nil, nil,

                [NSString stringWithFormat:

                    @"You cannot select another action until the '%@' action has finished running.",

                    selectedWorkflow]

            );

    }

        /* return true only if we are not in the middle of running an action. */

    return ! self.runningWorkflow;

}

    /* tableViewSelectionIsChanging: is called after the selection has changed.  All there

    is to do here is update the workflow displayed in the AMWorkflowView to show the newly

    selected workflow. */

- (void)tableViewSelectionIsChanging:(NSNotification *)aNotification {

    [self displaySelectedWorkflow];

}

    /* AMWorkflowController delegate methods.  In these routines we adjust the

    value of our runningWorkflow property.  Key value bindings to this property

    defined in our interface file take care of enabling/disabling the run/stop buttons,

    and displaying the progress bar. */

- (void)workflowControllerWillRun:(AMWorkflowController *)controller {

    self.runningWorkflow = YES;

}

- (void)workflowControllerDidRun:(AMWorkflowController *)controller {

    self.runningWorkflow = NO;

}

- (void)workflowControllerDidStop:(AMWorkflowController *)controller {

    self.runningWorkflow = NO;

}

- (void)dealloc

{

    self.workflows = nil;

}

@end