/*

 File: MigratorAppDelegate.m

 Abstract: <<ABSTRACT CONTENT HERE>>

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "MigratorAppDelegate.h"

#import "DataMigrator.h"

#import "MigrationUtilities.h"

@implementation MigratorAppDelegate

- (void)presentErrorWithDescription:(NSString *)errorString {

    NSError *error = [NSError errorWithDomain: @"Migrator" code: 0 userInfo: [NSDictionary dictionaryWithObject: errorString forKey: NSLocalizedDescriptionKey]];

    [[NSApplication sharedApplication] presentError:error];

}

- (BOOL)checkExistenceOfOldStore {

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *storePath = [oldStorePathTextField stringValue];

    BOOL isDirectory = NO;

    if (nil == storePath || [@"" isEqualToString: storePath]) {

        [self presentErrorWithDescription: @"Old store path must not be null"];

        return NO;

    }

    if ([fileManager fileExistsAtPath: storePath isDirectory: &isDirectory]) {

        // There is a file at storePath, can we read from it?

        if (isDirectory) {

            // not if it's a directory

            [self presentErrorWithDescription: [NSString stringWithFormat: @"Can't read old store from path - that location is a directory (%@)", storePath]]; 

            return NO;

        } else if (![fileManager isReadableFileAtPath: storePath]) {

            // not if I don't have access rights

            [self presentErrorWithDescription: [NSString stringWithFormat: @"Can't read old store file from path (%@)", storePath]];      

            return NO;

        } else {

            // There is a file, I can read it, but ...

            NSString *modelVersion = [MigrationUtilities getMetadataForKey: @"Migration Example Version" inStoreWithPath: storePath inContext: nil];

            if ([@"Version 1" isEqualToString: modelVersion]) {

                return YES;

            } else {

                [self presentErrorWithDescription: [NSString stringWithFormat: @"Incorrect version in old store metadata from store at (%@); found: %@", storePath, modelVersion]];     

                return NO;

            }            

        }

    } else {

        // There is no store where we've said there would be one

        [self presentErrorWithDescription: [NSString stringWithFormat: @"Store not found at path %@" , storePath]];

        return NO;

    }

    return NO;

}

- (BOOL)validatePaths {

    if ([self checkExistenceOfOldStore]) {

        if ([MigrationUtilities validatePathForNewStore: [newStorePathTextField stringValue]]) {

            return YES;

        }     

    } 

    // Error reporting will have be done by one of the validation methods

    return NO;

}

// Initiates the migration of the data from the old store to the new store

- (IBAction)migrateAction:(id)sender {

    NSError *error = nil;

    [oldStoreContentTextView setString:@""];

    [newStoreContentTextView setString:@""];

    if ([self validatePaths]) {

        [self showOldStoreContents];

        DataMigrator *migrator = [[DataMigrator alloc] initWithOldStorePath: [oldStorePathTextField stringValue] newStorePath: [newStorePathTextField stringValue]];

        if (nil != migrator) {

            if (![migrator migrateData:&error]) {

                [[NSApplication sharedApplication] presentError:error];

            } else {

                [self showNewStoreContents];

            }

        }

        [migrator release];

    }

}

- (void)showOldStoreContents {

    NSString *oldStoreContents = [MigrationUtilities contentDescriptionForStoreAtPath:[oldStorePathTextField stringValue] withModel:[[MigrationUtilities retainedOldManagedObjectModel] autorelease]];

    [oldStoreContentTextView setString:oldStoreContents];

}

- (void)showNewStoreContents {

    NSString *newStoreContents = [MigrationUtilities contentDescriptionForStoreAtPath:[newStorePathTextField stringValue] withModel:[[MigrationUtilities retainedNewManagedObjectModel] autorelease]];

    [newStoreContentTextView setString:newStoreContents];

}

@end