#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#include <libgen.h>
#include <stdlib.h>
#include <stdarg.h>

#include "utils.h"


int main() {
    
    jobCount = 0;                                                                   // Initializes the number of suspended jobs to 0
    shell = getpid();                                                               // Process id of the shell
    signal(SIGINT, SIG_IGN);                                                        // Ignores SIGINT signal in shell
    signal(SIGQUIT, SIG_IGN);                                                       // Ignores SIGQUIT signal in shell
    signal(SIGTSTP, SIG_IGN);                                                       // Ignores SIGTSTP signal in shell
    getcwd(baseDirectory, MAXDIRECTORY);                                            // ..
    strcpy(curDirectory, baseDirectory);                                            // Gets the current working directory

    while (1) {                                                                     // Main loop
        char *curBaseName = strrchr(curDirectory, '/');                             // Temporary variable for the current base directory
        printf("[nyush %s]$ ", (curBaseName && strcmp(curBaseName + 1, "")) ? curBaseName + 1 : curDirectory);  // Print the prompt
        fflush(stdout);                                                             // Flushes prompt to STDODUT
        commandLine = malloc(sizeof(char) * MAXLENGTH);                             // Allocates memory for the command line
        readCommandLine(commandLine);                                               // Reads the command line
        parsedTokens = malloc(sizeof(char) * MAXLENGTH * MAXLENGTH);                // Allocates memory for the parsed tokens
        pipedCommands = malloc(sizeof(char) * MAXLENGTH * MAXLENGTH);               // Allocates memory for the piped commands
        inputFileName = NULL;                                                       // Input file name
        outputFileName = NULL;                                                      // Output file name
        isBackground = 0;                                                           // Sets default be in background
        pipeCount = checkPipingAndRedirection(commandLine);                         // Checks piping and redirection, gets the number of pipes and updates global variables
        if (pipeCount < 0) {                                                        // Piping and redirection check failed
            freeAll("122", commandLine, parsedTokens, pipedCommands);               // Frees all allocated memory
        }
        else if (pipeCount == 0) {                                                  // Command line has no piping
            char *tokenBuffer = malloc(sizeof(char) * MAXLENGTH);                   // Creates token buffer
            tokenCount = parseNoPiping(commandLine, tokenBuffer);                   // Parses the command line, gets the number of tokens
            executeCommandNoPiping(parsedTokens, tokenCount, tokenBuffer);          // Executes the command line
        }
        else {                                                                      // Command line has piping
            char *commandBuffer = malloc(sizeof(char) * MAXLENGTH);                 // Creates subcommand buffer
            subCommandCount = parseByPipe(commandLine, commandBuffer);              // Parses the command line, gets the number of subcommands
            executeCommandWithPiping(pipedCommands, subCommandCount, commandBuffer);  // Executes the command line
        }
    }

    return 0;                                                                        // Ends and terminates

}