/*

     File: main.m

 Abstract:  Standard main file. Reads in and parses arguments to either read/write timecode samples. 

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 */

#import <Foundation/Foundation.h>

#import <AVFoundation/AVFoundation.h>

#import <getopt.h>

#import "AVTimecodeReader.h"

#import "AVTimecodeWriter.h"

static void usage()

{

    printf("Usage: avtimecodereadwrite mode_name [options] [input_source] [output_file]\n");

    printf("By default, input_source is a path to a local file.\n");

    printf("\nModes:\n");

    printf("  read\n");

    printf("  write\n");

    printf("\nOptions:\n");

    printf("  -i, --input=timecode file,        A file containing frame numbers and timecodes, where each line represents a pair frameNum HH:MM:SS./,FF (. for non-drop and , drop frame) to be written out to a movie\n");

    printf("                    Example file format: \n");

    printf("                    frame1 H1:M1:S1.F1\n");

    printf("                    frame2 H2:M2:S2.F2\n");

    printf("  -h, --help                Print this message and exit\n");

    exit(1);

}

int main(int argc, char *argv[])

{

    @autoreleasepool {

        int c = -1;

        NSString *timecodeInput = NULL;

        NSURL *sourceURL = NULL;

        NSURL *destURL = NULL;

        NSFileManager *fm = [NSFileManager defaultManager];

        static struct option longopts[] =

        {

            {"input", required_argument, NULL, 'i'},

            {"help", no_argument, NULL, 'h'},

            {0, 0, 0, 0}

        };

        const char *shortopts = "i:h";

        if (argc < 2) {

            usage();

            exit(-1);

        }

        while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {

            switch (c) {

                case 'i':

                    timecodeInput = [NSString stringWithUTF8String:optarg];

                    break;

                case 'h':

                    usage();

                    break;

                default:

                    usage();

                    break;

            }

        }

        int nextArgIndex = optind;

        if (nextArgIndex >= argc)

        {

            printf("%s: missing required mode name\n", argv[0]);

            usage();

            exit(-1);

        }

        const char *mode = argv[nextArgIndex];

        ++nextArgIndex;

        BOOL testTakesDestURL = (strcmp(mode, "write") == 0);

        if (nextArgIndex < argc) {

            const char *sourceSpecifier = argv[nextArgIndex];

            sourceURL = [NSURL fileURLWithPath:[NSString stringWithUTF8String:sourceSpecifier]];

            NSCAssert(sourceURL != nil, @"Invalid source URL");

            ++nextArgIndex;

        }

        if ((nextArgIndex < argc) && testTakesDestURL)

        {

            NSString *destPath = [fm stringWithFileSystemRepresentation:argv[nextArgIndex] length:strlen(argv[nextArgIndex])];

            destPath = [destPath stringByStandardizingPath];

            destURL = [NSURL fileURLWithPath:destPath];

            NSError *error = nil;

            [fm removeItemAtPath:destPath error:&error];

            NSCAssert(destURL != nil, @"Invalid destination URL");

            ++nextArgIndex;

        } else if (testTakesDestURL) {

            printf("%s: writer needs destination URL\n", argv[0]);

            usage();

            exit(-1);

        }

        if (nextArgIndex > argc)

        {

            printf("%s: too many arguments\n", argv[0]);

            usage();

            exit(-1);

        }

        AVURLAsset *sourceAsset = [[AVURLAsset alloc] initWithURL:sourceURL options:nil];

        if (strcmp(mode, "read") == 0) {

            AVTimecodeReader *timecodeReader = [[AVTimecodeReader alloc] initWithSourceAsset:sourceAsset];

            NSArray *outputTimecodes = [timecodeReader readTimecodeSamples];

            for (NSValue *timecodeValue in outputTimecodes) {

                CVSMPTETime timecode = {0};

                [timecodeValue getValue:&timecode];

                NSLog(@"%@",[NSString stringWithFormat:@"HH:MM:SS:FF => %02d:%02d:%02d:%02d", timecode.hours, timecode.minutes, timecode.seconds, timecode.frames]);

            }

        } else if (strcmp(mode, "write") == 0) {

            NSMutableDictionary *timecodeSamples = [NSMutableDictionary dictionary];

            NSError *error = nil;

            NSString *timecodes = [NSString stringWithContentsOfFile:timecodeInput encoding:NSUTF8StringEncoding error:&error];

            if (error) {

                NSLog(@"%s: Could not read timecode input file", argv[0]);

            } else {

                NSArray *timecodeInputValues = [timecodes componentsSeparatedByString:@"\n"];

                for (NSString *frameNumTimecodePair in timecodeInputValues) {

                    NSArray *frameTcValues = [frameNumTimecodePair componentsSeparatedByString:@" "];

                    if ([frameTcValues count] > 1) {

                        [timecodeSamples setObject:[frameTcValues objectAtIndex:1] forKey:[NSNumber numberWithInt:[(NSString*)[frameTcValues objectAtIndex:0] intValue]]];

                    }

                }

                AVTimecodeWriter *timecodeWriter = [[AVTimecodeWriter alloc] initWithSourceAsset:sourceAsset destinationAssetURL:destURL timecodeSamples:timecodeSamples];

                [timecodeWriter writeTimecodeSamples];

            }

        } else {

            printf("%s: unrecognized mode %s\n", argv[0], mode);

            usage();

            exit(-1);

        }

    }

    return 0;

}