/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 View controller that sets up the table view and the time zone data.

 */

#import "APLTableViewController.h"

#import "APLRegion.h"

#import "APLTimeZoneWrapper.h"

#import "APLTimeZoneCell.h"

static NSString *kTableViewCellReuseIdentifierSelfSizingCell = @"Self Sizing Cell";

@interface APLTableViewController ()

@property (nonatomic, strong) NSArray *displayList;

@property (nonatomic, strong) NSCalendar *calendar;

@property (nonatomic, strong) NSTimer *minuteTimer;

@property (nonatomic, strong) NSDateFormatter *dateFormatter;

@end

@implementation APLTableViewController

#pragma mark - Accessors

- (NSDateFormatter *)dateFormatter {

    if( !_dateFormatter ) {

        _dateFormatter = [[NSDateFormatter alloc] init];

        NSString *dateFormat = [NSDateFormatter dateFormatFromTemplate:@"h:mm a" options:0 locale:[NSLocale currentLocale]];

        _dateFormatter.dateFormat = dateFormat;

    }

    return _dateFormatter;

}

- (void)setMinuteTimer:(NSTimer *)newTimer {

    if (_minuteTimer != newTimer) {

        [_minuteTimer invalidate];

        _minuteTimer = newTimer;

    }

}

#pragma mark - View Life Cycle

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    self.calendar = calendar;

    self.displayList = [self regions];

    //  Must set the following properties

    self.tableView.estimatedRowHeight = 85.0;

    self.tableView.rowHeight = UITableViewAutomaticDimension;

}

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    NSDate *date = [NSDate date];

    NSDate *oneMinuteFromNow = [date dateByAddingTimeInterval:60];

    NSCalendarUnit unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute;

    NSDateComponents *timerDateComponents = [self.calendar components:unitFlags fromDate:oneMinuteFromNow];

    timerDateComponents.second = 1;

    NSDate *minuteTimerDate = [self.calendar dateFromComponents:timerDateComponents];

    NSTimer *timer = [[NSTimer alloc] initWithFireDate:minuteTimerDate interval:60 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];

    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

    self.minuteTimer = timer;

}

- (void)viewWillDisappear:(BOOL)animated {

    [super viewWillDisappear:animated];

    self.minuteTimer = nil;

}

#pragma mark - Workers

- (void)update {

    NSDate *date = [NSDate date];

    for( APLRegion *region in self.displayList ) {

        [region setDate:date];

    }

}

- (void)updateTimer:(NSTimer *)timer {

    NSArray *visibleCells = self.tableView.visibleCells;

    for( APLTimeZoneCell *cell in visibleCells ) {

        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

        [self configureCell:cell forIndexPath:indexPath];

        [cell setNeedsDisplay];

    }

}

- (NSArray *)regions {

    NSArray *timeZoneNames = [NSTimeZone knownTimeZoneNames];

    NSMutableArray *regionsList = [[NSMutableArray alloc] initWithCapacity:0];

    for( NSString *timeZoneName in timeZoneNames ) {

        NSArray *nameComponents = [timeZoneName componentsSeparatedByString:@"/"];

        NSString *regionName = nameComponents.firstObject;

        APLRegion *region = [APLRegion regionNamed:regionName];

        if( !region ) {

            region = [APLRegion newRegionWithName:regionName];

            region.calendar = self.calendar;

            [regionsList addObject:region];

        }

        NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:timeZoneName];

        [region addTimeZone:timeZone nameComponents:nameComponents];

    }

    //  Sort time zones by name

    NSDate *date = [[NSDate alloc] init];

    for( APLRegion *region in regionsList ) {

        [region sortZones];

        [region setDate:date];

    }

    //  Sort regions by name

    NSArray *sortedRegions = [regionsList sortedArrayUsingComparator:^NSComparisonResult(APLRegion* region1, APLRegion* region2) {

        NSString *name1 = region1.name;

        NSString *name2 = region2.name;

        return [name1 localizedStandardCompare:name2];

    }];

    return sortedRegions;

}

- (void)configureCell:(APLTimeZoneCell *)cell forIndexPath:(NSIndexPath *)indexPath {

    APLRegion *region = self.displayList[indexPath.section];

    APLTimeZoneWrapper *timeZoneWrapper = (APLTimeZoneWrapper *)region.timeZoneWrappers[indexPath.row];

    //  Resizable Locale Name

    NSString *timeZoneLocaleName = ( timeZoneWrapper.timeZoneLocaleName ) ? timeZoneWrapper.timeZoneLocaleName : [region.name stringByAppendingString:@" Locale"];

    cell.nameLabel.text = timeZoneLocaleName;

    //  Resizable Detail Text Label

    cell.detailLabel.text = timeZoneWrapper.extendedDetailText;

    //  Time

    self.dateFormatter.timeZone = timeZoneWrapper.timeZone;

    cell.timeLabel.text = [self.dateFormatter stringFromDate:[NSDate date]];

    //  image

    cell.thumbnailImageView.image = timeZoneWrapper.image;

}

#pragma mark - UITableViewDatasource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return self.displayList.count;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    APLRegion *region = self.displayList[section];

    return region.timeZoneWrappers.count;

}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {

    APLRegion *region = self.displayList[section];

    return region.name;

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    APLTimeZoneCell *cell = [tableView dequeueReusableCellWithIdentifier:kTableViewCellReuseIdentifierSelfSizingCell];

    [self configureCell:cell forIndexPath:indexPath];

    return cell;

}

#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

}

#pragma mark - Memory Management

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    [self update];

}

- (void)dealloc {

    [_minuteTimer invalidate];

}

@end