#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>


typedef struct{
    char filename[128];
    char target[25];
    int idThread;
} Param_thread;


//prototype
void *fctThread(void* param);
pthread_t thread_handle[4];


int main(int argc, char** argv)
{
        int i=0, *retThread[4];
        int ret[4];
        Param_thread param[4];

        //initionalisation param
        strcpy(param[0].filename,"lorem.txt");
        strcpy(param[0].target,"lor");
        param[0].idThread = i;

        strcpy(param[1].filename,"lorem.txt");
        strcpy(param[1].target,"lor");
        param[1].idThread = 1;

        strcpy(param[2].filename,"lorem.txt");
        strcpy(param[2].target,"lor");
        param[2].idThread = 2;

        strcpy(param[3].filename,"lorem.txt");
        strcpy(param[3].target,"lor");
        param[3].idThread = 3;



        printf("Lancement des thread secondaires\n");
        for ( i = 0; i < 4; ++i)
        {
            printf("lancement thread %d\n",i);
            ret[i] = pthread_create(&thread_handle[i], NULL, (void*(*)(void*))fctThread, (void*)&param[i]);
        }

        for ( i = 0; i < 4; ++i)
        {
            printf("join thread %d\n",i);
            ret[i] = pthread_join(thread_handle[i], (void**) &retThread[i]);
            printf("valeur renvoyée par le thread %d : %d\n",i,*retThread[i]);
        }

        printf("fin principale\n");
}


void* fctThread(void *param){
    int nbrOcc = 0,nbr_read=1;
    int hd,i=0,j=0;
    Param_thread *arg = (Param_thread*) malloc(sizeof(Param_thread));
    arg = (Param_thread*) param;
    char output[50];

    printf("filename : %s\n",arg->filename);
    printf("cible : %s\n",arg->target);
    printf("idThread : %d\n",arg->idThread);

    char buffer[4];

    while(nbr_read>0){
        if( (hd = open(arg->filename,O_RDONLY)) == -1 ) {
            perror("erreur ouverture fichier");
            exit(0);
        }

        sprintf(output, "%%%ds\n",arg->idThread*5);
        printf(output,"*");


        if( (lseek(hd,i,SEEK_SET)) == -1 ){
            perror("erreur lseek");
            exit(0);
        }

        if ( (nbr_read = read(hd,buffer,3)) < 0){
            printf("fin de fichier\n");
            break;
        }

        if( (close(hd)) == -1){
            perror("erreur close");
        }
        // printf("%s-%s\n",buffer,arg->target);
        if(strcmp(buffer,arg->target) == 0){
            nbrOcc++;
        }

        i++;
    }

    free(arg);
    pthread_exit(&nbrOcc);
}