//
//  ViewController.m
//  PDFReader
//
//  Copyright © 2014-2022 PDF Technologies, Inc. All Rights Reserved.
//
//  The PDF Reader Sample applications are licensed with a modified BSD license.
//  Please see License for details. This notice may not be removed from this file.
//

#import "FileListViewController.h"
#import "PDFViewController.h"
#import "PDFSettingsViewController.h"

static const CGFloat TUpdateTimeInternal = 2.0;

@interface FileListViewController () <UITableViewDelegate, UITableViewDataSource>

@property (nonatomic,retain) NSMutableArray<NSString *> *fileArray;

@property (nonatomic,retain) NSTimer *updateFolderTimer;

@property (nonatomic,retain) UITableView *tableView;

@end

@implementation FileListViewController

#pragma mark - Init Methods

- (id)init {
    if (self = [super init]) {
        
    }
    return self;
}

- (void)dealloc {
    _tableView.delegate = nil;
    _tableView.dataSource = nil;
    [_tableView release];
    
    if ([_updateFolderTimer isValid]){
        [_updateFolderTimer invalidate];
    }
    [_updateFolderTimer release];
    [_fileArray release];
    [_path release];
    [super dealloc];
}

#pragma mark - UIViewController Methods

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    if (!self.path) {
        self.path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    }
    self.title = [self.path lastPathComponent];
    
    [self loadSamplesFiles];
    
    self.tableView = [[[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain] autorelease];
    self.tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
    [self.view addSubview:self.tableView];
    
    UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Settings", nil)
                                                             style:UIBarButtonItemStylePlain
                                                            target:self
                                                            action:@selector(buttonItemClicked_Settings)];
    self.navigationItem.rightBarButtonItem = item;
    [item release];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.navigationController.navigationBar.translucent = NO;
    
    // 开启定时器
    [self registTimer];
    
    // 刷新数据
    [self reloadFileManagerData];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    // 关闭定时器
    [self unregistTimer];
}

- (void)buttonItemClicked_Settings {
    PDFSettingsViewController *vc = [[PDFSettingsViewController alloc] init];
    [self.navigationController pushViewController:vc animated:YES];
    [vc release];
}

- (void)loadSamplesFiles {
    NSURL *samplesURL = [NSBundle.mainBundle.resourceURL URLByAppendingPathComponent:@"Samples"];
    NSString *docsFolder = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject;
    
    
    NSArray *tFileNames = [NSArray arrayWithObjects:@"Form_Widgets_Test.pdf", @"PDF32000_2008.pdf", @"Quick Start Guide.pdf", @"Quick Start Guide.docx", nil];
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    
    for ( int i = 0; i < [tFileNames count]; i++) {
        NSURL *tBFilePath = [samplesURL URLByAppendingPathComponent:[tFileNames objectAtIndex:i]];
        NSURL *tDFilePathName = [NSURL fileURLWithPath:[docsFolder stringByAppendingPathComponent:[tFileNames objectAtIndex:i]]];
        
        if (![fileManager fileExistsAtPath:tDFilePathName.path]) {
            if ([fileManager fileExistsAtPath:tBFilePath.path]) {
                [fileManager copyItemAtURL:tBFilePath toURL:tDFilePathName error:nil];
            }
        }
    }
}

#pragma mark - Private Methods

- (void)registTimer {
    self.updateFolderTimer = [NSTimer timerWithTimeInterval:TUpdateTimeInternal
                                                     target:self
                                                   selector:@selector(updateFileManagerData)
                                                   userInfo:nil
                                                    repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:self.updateFolderTimer forMode:NSDefaultRunLoopMode];
}

- (void)unregistTimer {
    if ([self.updateFolderTimer isValid]){
        [self.updateFolderTimer invalidate];
    }
    self.updateFolderTimer = nil;
}

- (void)updateFileManagerData {
    [self reloadFileManagerData];
}

- (void)reloadFileManagerData {
    [self searchFiles];
    [self.tableView reloadData];
}

- (void)searchFiles {
    NSMutableArray *folders = [NSMutableArray array];
    NSMutableArray *files   = [NSMutableArray array];
    
    NSURL *url = [NSURL fileURLWithPath:self.path];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *contents = [fileManager contentsOfDirectoryAtURL:url
                                   includingPropertiesForKeys:nil
                                                      options:(NSDirectoryEnumerationSkipsSubdirectoryDescendants |
                                                               NSDirectoryEnumerationSkipsPackageDescendants |
                                                               NSDirectoryEnumerationSkipsHiddenFiles)
                                                        error:nil];
    for (int i=0; i<[contents count]; i++) {
        NSString *filePath = [[contents objectAtIndex:i] path];
        BOOL isDirectory = NO;
        [[NSFileManager defaultManager] fileExistsAtPath:filePath isDirectory:&isDirectory];
        if (isDirectory) {
            [folders addObject:filePath];
        } else {
            NSString *pathExtension = [filePath.pathExtension lowercaseString];
            if ([pathExtension isEqualToString:@"pdf"] ||
                [pathExtension isEqualToString:@"docx"]) {
                [files addObject:filePath];
            }
        }
    }
    
    [self.fileArray removeAllObjects];
    self.fileArray = [NSMutableArray array];
    [self.fileArray addObjectsFromArray:folders];
    [self.fileArray addObjectsFromArray:files];
}

#pragma mark - UITableViewDataSource

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    NSString *filePath = self.fileArray[indexPath.row];
    BOOL isDirectory = NO;
    [[NSFileManager defaultManager] fileExistsAtPath:filePath isDirectory:&isDirectory];
    cell.textLabel.text = [filePath lastPathComponent];
    return cell;
}

#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSString *filePath = self.fileArray[indexPath.row];
    BOOL isDirectory = NO;
    [[NSFileManager defaultManager] fileExistsAtPath:filePath isDirectory:&isDirectory];
    if (isDirectory) {
        FileListViewController *vc = [[FileListViewController alloc] init];
        vc.path = filePath;
        [self.navigationController pushViewController:vc animated:YES];
        [vc release];
    } else {
        
        if ([filePath.pathExtension isEqualToString:@"pdf"]) {
            
            // Initializers, Make sure you enter the local document path in PDF format
            PDFViewController *vc = [[PDFViewController alloc] initWithFilePath:filePath];
            [self.navigationController pushViewController:vc animated:YES];
            [vc release];
            
        } else {

            UIActivityIndicatorView *aiView = [[[UIActivityIndicatorView alloc] init] autorelease];
            aiView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
            aiView.color = [UIColor grayColor];
            [aiView sizeToFit];
            aiView.center = self.view.center;
            aiView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin;
            [self.view addSubview:aiView];
            [aiView startAnimating];
            self.view.userInteractionEnabled = NO;
            
            NSString *fileName = [[filePath.lastPathComponent stringByDeletingPathExtension] stringByAppendingPathExtension:@"pdf"];
            NSString *pdfFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:fileName];
            
            NSFileManager *fileManager = [NSFileManager defaultManager];
            if ([fileManager fileExistsAtPath:pdfFilePath]) {
                [fileManager removeItemAtPath:pdfFilePath error:nil];
            }
            
            // Convert files (doc, docx, xls, xlsx, ppt, pptx, txt, jpeg, and png) to PDF (offline)
            [[CPDFKit sharedInstance] convertFilePath:filePath toPath:pdfFilePath completion:^(BOOL result) {
                self.view.userInteractionEnabled = YES;
                [aiView removeFromSuperview];
                if (result) {
                    PDFViewController *vc = [[PDFViewController alloc] initWithFilePath:pdfFilePath];
                    [self.navigationController pushViewController:vc animated:YES];
                    [vc release];
                }
            }];
        }
    }
}

@end