//
//  GroupViewController.m
//  BSUIR Schedule
//
//  Created by Laba Kirill on 5/13/15.
//  Copyright (c) 2015 Laba Kirill. All rights reserved.
//

#import "GroupViewController.h"
#import "Group.h"
#import "Schedule.h"

@interface GroupViewController ()

@property (weak, nonatomic) IBOutlet UITableView *groupTable;

@property (strong, nonatomic) NSMutableArray *groups;
@property (assign, nonatomic) NSInteger selectedIndexCell;

@end

@implementation GroupViewController

- (void)viewDidLoad {
    self.groupTable.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    NSManagedObjectContext *context = [self managedObjectContext];
    NSFetchRequest *request= [[NSFetchRequest alloc] init];
    NSEntityDescription *description = [NSEntityDescription entityForName:@"Group" inManagedObjectContext:context];

    [request setEntity:description];


    NSError *error = nil;
    self.groups = [[context executeFetchRequest:request error:&error] mutableCopy];
    self.selectedIndexCell = [self findSelectedCell];

//
//    //print default
//    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
//    NSLog(@"%@, %@", [defaults objectForKey:@"selectedGroup"], [defaults objectForKey:@"selectedSubgroup"]);

    [self.groupTable reloadData];
}

#pragma mark - Table Delegate

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.groups.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

    id object = self.groups[indexPath.row];
    Group *record = (Group *)object;

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if([record.group isEqualToString:[defaults objectForKey:@"selectedGroup"]] && [record.subgroup isEqualToString:[defaults objectForKey:@"selectedSubgroup"]]) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
    else {
        cell.accessoryType = UITableViewCellAccessoryNone;
        [tableView deselectRowAtIndexPath:indexPath animated:YES];
    }

    cell.textLabel.text = [NSString stringWithFormat:@"%@ - %@",record.group, record.subgroup];// record.group;

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.selectedIndexCell = [self findSelectedCell];

    NSIndexPath *index = [NSIndexPath indexPathForRow:self.selectedIndexCell inSection:0];
    [tableView cellForRowAtIndexPath:index].accessoryType = UITableViewCellAccessoryNone;
    [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    /* or
     selectedIndex = indexPath.row;
     [tableView reloadData];
     */

    id object = self.groups[indexPath.row];
    Group *record = (Group *)object;

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:record.group forKey:@"selectedGroup"];
    [defaults setObject:record.subgroup forKey:@"selectedSubgroup"];
    [defaults synchronize];
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    return YES;
}

-(NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath {
    return @"Удалить";
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    NSManagedObjectContext *context = [self managedObjectContext];

    if (editingStyle == UITableViewCellEditingStyleDelete) {
        if (self.groups.count != 1) {
            NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

            Group *record = (Group *)[self.groups objectAtIndex:indexPath.row];
            if ([[defaults objectForKey:@"selectedGroup"] isEqual:record.group] && [[defaults objectForKey:@"selectedSubgroup"] isEqual:record.subgroup]) {

                NSIndexPath *indexPath;
                if (indexPath.row == 0) {
                    record = (Group *)[self.groups objectAtIndex:1];
                    indexPath = [NSIndexPath indexPathForRow:1 inSection:0];
                } else {
                    record = (Group *)[self.groups firstObject];
                    indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
                }

                [defaults setObject:record.group forKey:@"selectedGroup"];
                [defaults setObject:record.subgroup forKey:@"selectedSubgroup"];
                [defaults synchronize];

                [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationLeft];
            }

            if ([self getCountRecordsOfGroup:[self.groups objectAtIndex:indexPath.row]] == 1) {
                [self deleteLessonsForGroup:[self.groups objectAtIndex:indexPath.row]];
            }

            [context deleteObject:[self.groups objectAtIndex:indexPath.row]];

            NSError *error = nil;
            if (![context save:&error]) {
                NSLog(@"%@", [error localizedDescription]);
            }

            [self.groups removeObjectAtIndex:indexPath.row];

            [self.groupTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

            [self deleteEmptyEmployeeRecords];
        } else {
            UIAlertView *allert = [[UIAlertView alloc] initWithTitle:@"Упс..." message:@"Нельзя удалить единственное расписание!" delegate:self cancelButtonTitle:@"Ой, все!" otherButtonTitles:nil];
            [allert show];
        }
    }
}

- (NSInteger)findSelectedCell {
    NSInteger index;
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    if (self.groups.count == 1) {
        id object = self.groups.firstObject;
        Group *record = (Group *)object;

        [defaults setObject:record.group forKey:@"selectedGroup"];
        [defaults setObject:record.subgroup forKey:@"selectedSubgroup"];
        [defaults synchronize];
    } else {
        for (int i = 0; i < self.groups.count; i++) {
            id object = self.groups[i];
            Group *record = (Group *)object;

            if ([record.group isEqualToString:[defaults objectForKey:@"selectedGroup"]] && [record.subgroup isEqualToString:[defaults objectForKey:@"selectedSubgroup"]]) {
                index = i;
                break;
            }
        }
    }

    return index;
}

#pragma mark - Core Data

- (void)deleteEmptyEmployeeRecords {
    NSManagedObjectContext *context = [self managedObjectContext];
    NSFetchRequest *request= [[NSFetchRequest alloc] init];
    NSPredicate* predicate = [NSPredicate predicateWithFormat:@"lesson.@count == 0"];
    [request setPredicate:predicate];

    NSEntityDescription *description = [NSEntityDescription entityForName:@"Employee" inManagedObjectContext:context];
    [request setEntity:description];

    NSError *error = nil;
    NSArray *allObjects = [context executeFetchRequest:request error:&error];

    for (id object in allObjects) {
        [context deleteObject:object];
    }

    if (![context save:&error]) {
        NSLog(@"%@", [error localizedDescription]);
    }
}

- (void)deleteLessonsForGroup:(id)group {
    Group *record = (Group *)group;

    NSManagedObjectContext *context = [self managedObjectContext];
    NSFetchRequest *request= [[NSFetchRequest alloc] init];
    NSPredicate* predicate =
    [NSPredicate predicateWithFormat:@"group = %@", record.group];
    [request setPredicate:predicate];

    NSEntityDescription *description = [NSEntityDescription entityForName:@"Lesson" inManagedObjectContext:context];
    [request setEntity:description];

    NSError *error = nil;
    NSArray *allObjects = [context executeFetchRequest:request error:&error];

    for (id object in allObjects) {
        [context deleteObject:object];
    }

    if (![context save:&error]) {
        NSLog(@"%@", [error localizedDescription]);
    }
}

- (NSInteger)getCountRecordsOfGroup:(id)group {
    Group *record = (Group *)group;

    NSManagedObjectContext *context = [self managedObjectContext];
    NSFetchRequest *request= [[NSFetchRequest alloc] init];
    NSPredicate* predicate =
    [NSPredicate predicateWithFormat:@"group = %@", record.group];
    [request setPredicate:predicate];

    NSEntityDescription *description = [NSEntityDescription entityForName:@"Group" inManagedObjectContext:context];
    [request setEntity:description];

    NSError *error = nil;
    NSArray *allObjects = [context executeFetchRequest:request error:&error];

    return allObjects.count;
}

- (NSManagedObjectContext *)managedObjectContext {
    NSManagedObjectContext *context = nil;
    id delegate = [[UIApplication sharedApplication] delegate];

    if ([delegate performSelector:@selector(managedObjectContext)]) {
        context = [delegate managedObjectContext];
    }

    return context;
}

@end