/*

 Copyright (C) 2015 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 View controller in charge of measuring distance between 2 locations.

 */

#import "DistanceViewController.h"

#import "CoordinateSelectorTableViewController.h"

#import "PlacemarksListViewController.h"

@interface DistanceViewController ()

@property (readonly) CoordinateSelectorTableViewController *toCoordinateSelector;  

@property (readonly) CoordinateSelectorTableViewController *fromCoordinateSelector;  

@end

#pragma mark -

@implementation DistanceViewController

#pragma mark - View lifecycle

- (void)viewDidLoad

{

    [super viewDidLoad];

    _toCoordinateSelector = [[CoordinateSelectorTableViewController alloc] init];

    _fromCoordinateSelector = [[CoordinateSelectorTableViewController alloc] init];

    self.tableView.estimatedRowHeight = 44.f;

    self.tableView.rowHeight = UITableViewAutomaticDimension;

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    [self.tableView reloadData];

}

#pragma mark - Distance Calculation

- (double)distanceBetweenCoordinates

{

    CLLocationDegrees latitude, longitude;

    latitude = self.toCoordinateSelector.selectedCoordinate.latitude;

    longitude = self.toCoordinateSelector.selectedCoordinate.longitude;

    CLLocation *to = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];

    latitude = self.fromCoordinateSelector.selectedCoordinate.latitude;

    longitude = self.fromCoordinateSelector.selectedCoordinate.longitude;

    CLLocation *from = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];

    CLLocationDistance distance = [to distanceFromLocation:from];

    return distance;

}

#pragma mark - UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    // return the number of sections

    return 2;

}

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

{

    // return the number of rows in the section

    return 1;

}

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

{

    UITableViewCell *cell = nil;

    // to and from cells

    if (indexPath.section == 0 || indexPath.section == 1)

    {

        cell = [tableView dequeueReusableCellWithIdentifier:@"selectorCell"];

        if (cell == nil)

        {

            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"selectorCell"];

            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

        }

        CoordinateSelectorTableViewController *selector;

        switch (indexPath.section)

        {

            default:

            case 0:

                selector = self.toCoordinateSelector;

                break;

            case 1:

                selector = self.fromCoordinateSelector;

                break;

        }

        if (selector.selectedType != CoordinateSelectorLastSelectedTypeUndefined)

        {

            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

            (cell.textLabel).lineBreakMode = NSLineBreakByWordWrapping;

            cell.textLabel.numberOfLines = 0;

            cell.textLabel.font = [UIFont systemFontOfSize:16.0];

            cell.textLabel.text = selector.selectedName;

            if (CLLocationCoordinate2DIsValid(selector.selectedCoordinate))

            {

                (cell.detailTextLabel).lineBreakMode = NSLineBreakByWordWrapping;

                cell.detailTextLabel.numberOfLines = 0;

                cell.detailTextLabel.font = [UIFont boldSystemFontOfSize:16.0];

                cell.detailTextLabel.text = [NSString stringWithFormat:@"φ:%.4F, λ:%.4F", selector.selectedCoordinate.latitude, selector.selectedCoordinate.longitude];

            }

        }

        else

        {

            cell.textLabel.text = @"Select a Place";

            cell.detailTextLabel.text = @"";

        }

    }

    return cell;

}

- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section

{

    if (section == 1)

    {

        if (self.toCoordinateSelector.selectedType != CoordinateSelectorLastSelectedTypeUndefined &&

            self.fromCoordinateSelector.selectedType != CoordinateSelectorLastSelectedTypeUndefined)

        {

            return [NSString stringWithFormat:@"%.1f km\n(as the crow flies)", [self distanceBetweenCoordinates] / 1000];

        }

        else

        {

            return @"- km";

        }

    }

    return nil;

}

#pragma mark - UITableViewDelegate

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

{

    [[tableView cellForRowAtIndexPath:indexPath] setSelected:NO];

    if (indexPath.section == 0)

    {

        [self.navigationController pushViewController:self.toCoordinateSelector animated:YES];

    }

    else if (indexPath.section == 1)

    {

        [self.navigationController pushViewController:self.fromCoordinateSelector animated:YES];

    }

}

@end