#include "channel.h"
#include <stdio.h>
#include <stdbool.h>

int channel_main(int argc, char* argv[])
{
    bool running = true;
    FILE *input_file = fopen(argv[2], "rb");
    if (input_file == NULL) {
        fprintf(stderr, "Error opening input file: %s\n", argv[2]);
        return 1;
    }
    FILE *output_file = fopen(argv[3], "wb");
    if (output_file == NULL) {
        fprintf(stderr, "Error opening output file: %s\n", argv[3]);
        fclose(input_file);
        return 1;
    }

    while (running){
        // Read data 
        unsigned char buffer[1024];
        size_t bytes_read = fread(buffer, 1, sizeof(buffer), input_file);

        if (bytes_read == 0) {
            if (feof(input_file)) {
                running = false; // eof reached
            } else {
                fprintf(stderr, "Error reading from input file\n");
                fclose(input_file);
                fclose(output_file);
                return 1;
            }
        }

        // Channel data
        unsigned char processed_data[1024];
        size_t processed_size = process_channel(buffer, bytes_read, processed_data);

        // Write data
        fwrite(processed_data, 1, processed_size, output_file);
    }
    fclose(input_file);
    fclose(output_file);
    return 0;
}