//plainTextHandle.h
#include <stdio.>
#include <stdlib.>

#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

typedef struct {
    unsigned int    textLen;    //Length of actual file, Excluding terminating \0
    char*       textContent;    //Pointer to memory containing the actual text file
    int     textIndexCount; //Number of lines
    char**      textIndex;  //Pointer to list of pointers to the beginning of each null-terminated line
} t_textFile;

t_textFile* t_textFile_C(FILE* stream);
void t_textFile_D(t_textFile* target);

//plainTextHandle.c
#include "plainTextHandle.h"

t_textFile* t_textFile_C(FILE* stream) {
    t_textFile* newStruct = malloc(sizeof(*newStruct));

    //Determine File Length
    struct stat statBuff;
    if(fstat(fileno(stream), &statBuff)) { free(newStruct); return(0); }
    newStruct->textLen = statBuff.st_size;

    //Buffer
    newStruct->textContent = malloc(newStruct->textLen+1);

    //Load
    if( newStruct->textLen != fread(newStruct->textContent, 1, newStruct->textLen, stream) ) {
        //Some error occurred, end of file was not reached
        if(DEBUG_MODE){printf("Failed to read file");}
        free(newStruct->textContent);
        free(newStruct);
        return(0);
    }

    //Null Terminate
    newStruct->textContent[newStruct->textLen] = '\0';

    //Get count of lines
    newStruct->textIndexCount = 1;
    for(unsigned int i=1; i < newStruct->textLen; i++){
        if(newStruct->textContent[i] == '\n') {
            (newStruct->textIndexCount)++;
        }
    }

    //Buffer for line index
    newStruct->textIndex = malloc(sizeof(newStruct->textIndex) * newStruct->textIndexCount);

    //Populate index, replace \n with \0 to null-terminate each line

    newStruct->textIndex[0] = newStruct->textContent; //First line
    int j = 1; //Position in the index

    for(unsigned int i=1; i < newStruct->textLen; i++){
        if(newStruct->textContent[i]    ==  '\n') {
            newStruct->textContent[i] = '\0';
            newStruct->textIndex[j] = newStruct->textContent+i+1;
            j++;
        }
    }

    return(newStruct);
}

void t_textFile_D(t_textFile* target) {
    free(target->textIndex);
    target->textIndex = 0;

    free(target->textContent);
    target->textContent = 0;

    free(target);

    return;
}