/*

     File: APLCalibrationBeginViewController.m

 Abstract: View controller for bootstrapping the calibration process.

  Version: 1.1

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 */

#import "APLCalibrationBeginViewController.h"

#import "APLCalibrationEndViewController.h"

#import "APLCalibrationCalculator.h"

#import "APLProgressTableViewCell.h"

#import "APLDefaults.h"

@interface APLCalibrationBeginViewController()

@property (nonatomic) CLLocationManager *locationManager;

@property (nonatomic) NSMutableDictionary *beacons;

@property (nonatomic) NSMutableArray *rangedRegions;

@property (nonatomic) APLCalibrationCalculator *calculator;

@property BOOL inProgress;

@end

@implementation APLCalibrationBeginViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    // This location manager will be used to display beacons available for calibration.

    self.locationManager = [[CLLocationManager alloc] init];

    self.locationManager.delegate = self;

    self.inProgress = NO;

    self.beacons = [[NSMutableDictionary alloc] init];

    // Populate the regions for the beacons we're interested in calibrating.

    self.rangedRegions = [NSMutableArray array];

    for (NSUUID *uuid in [APLDefaults sharedDefaults].supportedProximityUUIDs)

    {

        CLBeaconRegion *region = [[CLBeaconRegion alloc] initWithProximityUUID:uuid identifier:[uuid UUIDString]];

        [self.rangedRegions addObject:region];

    }

}

- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    // Start ranging to show the beacons available for calibration.

    [self startRangingAllRegions];

}

- (void)viewDidDisappear:(BOOL)animated

{

    [super viewDidDisappear:animated];

    // Cancel calibration (if it was started) and stop ranging when the view goes away.

    [self.calculator cancelCalibration];

    [self stopRangingAllRegions];

}

#pragma mark - Ranging beacons

- (void)startRangingAllRegions

{

    for (CLBeaconRegion *region in self.rangedRegions)

    {

        [self.locationManager startRangingBeaconsInRegion:region];

    }

}

- (void)stopRangingAllRegions

{

    for (CLBeaconRegion *region in self.rangedRegions)

    {

        [self.locationManager stopRangingBeaconsInRegion:region];

    }

}

- (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region

{    

    // CoreLocation will call this delegate method at 1 Hz with updated range information.

    // Beacons will be categorized and displayed by proximity.

    [self.beacons removeAllObjects];

    NSArray *unknownBeacons = [beacons filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"proximity = %d", CLProximityUnknown]];

    if([unknownBeacons count])

        self.beacons[@(CLProximityUnknown)] = unknownBeacons;

    NSArray *immediateBeacons = [beacons filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"proximity = %d", CLProximityImmediate]];

    if([immediateBeacons count])

        self.beacons[@(CLProximityImmediate)] = immediateBeacons;

    NSArray *nearBeacons = [beacons filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"proximity = %d", CLProximityNear]];

    if([nearBeacons count])

        self.beacons[@(CLProximityNear)] = nearBeacons;

    NSArray *farBeacons = [beacons filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"proximity = %d", CLProximityFar]];

    if([farBeacons count])

        self.beacons[@(CLProximityFar)] = farBeacons;

    [self.tableView reloadData];

}

- (void)updateProgressViewWithProgress:(float)percentComplete

{

    if (!self.inProgress)

    {

        return;

    }

    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];

    APLProgressTableViewCell *progressCell = (APLProgressTableViewCell *)[self.tableView cellForRowAtIndexPath:indexPath];

    [progressCell.progressView setProgress:percentComplete animated:YES];

}

#pragma mark - Table view data source/delegate

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    // A special indicator appears if calibration is in progress.

    // This is handled throughout the table view controller delegate methods.

    NSInteger i = self.inProgress ? self.beacons.count + 1 : self.beacons.count;

    return i;

}

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

{

    NSInteger adjustedSection = section;

    if(self.inProgress)

    {

        if(adjustedSection == 0)

        {

            return 1;

        }

        else

        {

            adjustedSection--;

        }

    }

    NSArray *sectionValues = [self.beacons allValues];

    return [sectionValues[adjustedSection] count];

}

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

{

    NSInteger adjustedSection = section;

    if(self.inProgress)

    {

        if(adjustedSection == 0)

        {

            return nil;

        }

        else

        {

            adjustedSection--;

        }

    }

    NSString *title;

    NSArray *sectionKeys = [self.beacons allKeys];

    NSNumber *sectionKey = sectionKeys[adjustedSection];

    switch([sectionKey integerValue])

    {

        case CLProximityImmediate:

            title = NSLocalizedString(@"Immediate", @"Section title in begin calibration view controller");

            break;

        case CLProximityNear:

            title = NSLocalizedString(@"Near", @"Section title in begin calibration view controller");

            break;

        case CLProximityFar:

            title = NSLocalizedString(@"Far", @"Section title in begin calibration view controller");

            break;

        default:

            title = NSLocalizedString(@"Unknown", @"Section title in begin calibration view controller");

            break;

    }

    return title;

}

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

{

    static NSString *beaconCellIdentifier = @"BeaconCell";

    static NSString *progressCellIdentifier = @"ProgressCell";

    NSInteger section = indexPath.section;

    NSString *identifier = self.inProgress && section == 0 ? progressCellIdentifier : beaconCellIdentifier;

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];

    if(identifier == progressCellIdentifier)

    {

        return cell;

    }

    else if(self.inProgress)

    {

        section--;

    }

    NSNumber *sectionKey = [self.beacons allKeys][section];

    CLBeacon *beacon = self.beacons[sectionKey][indexPath.row];

    cell.textLabel.text = [beacon.proximityUUID UUIDString];

    NSString *formatString = NSLocalizedString(@"Major: %@, Minor: %@, Acc: %.2fm", @"format string for detail");

    cell.detailTextLabel.text = [NSString stringWithFormat:formatString, beacon.major, beacon.minor, beacon.accuracy];

    return cell;

}

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

{    

    NSNumber *sectionKey = [self.beacons allKeys][indexPath.section];

    CLBeacon *beacon = self.beacons[sectionKey][indexPath.row];

    if(!self.inProgress)

    {

        CLBeaconRegion *region = nil;

        if(beacon.proximityUUID && beacon.major && beacon.minor)

        {

            region = [[CLBeaconRegion alloc] initWithProximityUUID:beacon.proximityUUID major:[beacon.major shortValue] minor:[beacon.minor shortValue] identifier:BeaconIdentifier];

        }

        else if(beacon.proximityUUID && beacon.major)

        {

            region = [[CLBeaconRegion alloc] initWithProximityUUID:beacon.proximityUUID major:[beacon.major shortValue] identifier:BeaconIdentifier];

        }

        else if(beacon.proximityUUID)

        {

            region = [[CLBeaconRegion alloc] initWithProximityUUID:beacon.proximityUUID identifier:BeaconIdentifier];

        }

        if(region)

        {

            // We can stop ranging to display beacons available for calibration.

            [self stopRangingAllRegions];

            // And we'll start the calibration process.

            self.calculator = [[APLCalibrationCalculator alloc] initWithRegion:region completionHandler:^(NSInteger measuredPower, NSError *error) {

                if(error)

                {

                    // Only display if the view is showing.

                    if(self.view.window)

                    {

                        NSString *title = NSLocalizedString(@"Unable to calibrate device", @"Alert title for calibration begin view controller");

                        NSString *cancelTitle = NSLocalizedString(@"OK", @"Alert OK title for calibration begin view controller");

                        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:(error.userInfo)[NSLocalizedDescriptionKey] delegate:nil cancelButtonTitle:cancelTitle otherButtonTitles:nil];

                        [alert show];

                        // Resume displaying beacons available for calibration if the calibration process failed.

                        [self startRangingAllRegions];

                    }

                }

                else

                {

                    APLCalibrationEndViewController *endViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"EndViewController"];

                    endViewController.measuredPower = measuredPower;

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

                }

                self.inProgress = NO;

                self.calculator = nil;

                [self.tableView reloadData];

            }];

            __weak APLCalibrationBeginViewController *weakSelf = self;

            [self.calculator performCalibrationWithProgressHandler:^(float percentComplete) {

                [weakSelf updateProgressViewWithProgress:percentComplete];

            }];

            self.inProgress = YES;

            [self.tableView beginUpdates];

            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationAutomatic];

            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];

            [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

            [self.tableView endUpdates];

            [self updateProgressViewWithProgress:0.0];

        }

    }

}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

    if (self.inProgress && indexPath.section == 0)

    {

        return 66.0;

    }

    return 44.0;

}

@end