#ifndef shell_builtins
#define shell_builtins

#include "lsh_main_func.c"
#include "helper_functions.c"
#include <stdio.h>
#include <string.h>
#include <unistd.h>

/*
   Function Declarations for builtin shell commands:
   */

int lsh_cd(char **args);
int lsh_help(char **args);
int lsh_exit(char **args);
int export(char **args);

/*
   List of builtin commands, followed by their corresponding functions.
   */
char *builtin_str[] = {
    "cd",
    "help",
    "exit",
    "export"
};

int (*builtin_func[]) (char **) = {
    &lsh_cd,
    &lsh_help,
    &lsh_exit,
    &export
};

int lsh_num_builtins() {
    return sizeof(builtin_str) / sizeof(char *);
}

/*
   Builtin function implementations.
   */
#define LSH_CWD_BUF_SIZE 1024;
int lsh_cd(char **args)
{
    if (args[1] == NULL) {
        fprintf(stderr, "lsh: expected argument to \"cd\"\n");
    } else {
        int err = chdir(args[1]);
        if (err != 0) {
            perror("lsh");
        }

        int bufsize=LSH_CWD_BUF_SIZE;
        char *cwd=(char*)malloce(sizeof(char)*bufsize+1);
        while(getcwd(cwd,sizeof(char)*bufsize)==NULL){
            bufsize += LSH_CWD_BUF_SIZE;
            cwd=(char*)realloce(cwd,sizeof(char)*bufsize+1);
        }

        setenv("PWD",cwd,1);
        free(cwd);
    }
    return 1;
}

int lsh_help(char **args)
{
    int i;
    printf("FOX SHELL\n");
    printf("Type program names and arguments, and hit enter.\n");
    printf("The following are built in:\n");

    for (i = 0; i < lsh_num_builtins(); i++) {
        printf("  %s\n", builtin_str[i]);
    }

    printf("Use the man command for information on other programs.\n");
    return 1;
}

int lsh_exit(char **args)
{
    return 0;
}

int export(char **args){
    char *token;
    int position = 0;
    char *key = NULL;
    char *value = NULL;

    token = strtok(args[1], "=\r\n");
    while (token != NULL) {
        if(position == 0){
            key=token;
        } else if(position == 1){
            value=token;
        }

        position++;
        token = strtok(NULL, "=\r\n");
    }
    setenv(key,value,1);

    return 1;
}



int lsh_execute(char **args, CMD *cmd)
{
    int i;

    if (args[0] == NULL) {
        // An empty command was entered.
        return 1;
    }

    for (i = 0; i < lsh_num_builtins(); i++) {
        if (strcmp(args[0], builtin_str[i]) == 0) {
            return (*builtin_func[i])(args);
        }
    }

    return lsh_launch(args, cmd);
}
#endif