#include "namesarchive.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define INDEX_NOT_FOUND -1

typedef struct
{
    char name[MAX_NAME_LEN+1];
    unsigned int id;
} Student;

static char names[MAX_NAMES][MAX_NAME_LEN+1];
static unsigned int numberOfEntries = 0;

int addName(const char *name)
{
    if(numberOfEntries < MAX_NAMES)
    {
        strncpy(names[numberOfEntries], name, MAX_NAME_LEN+1);
        names[numberOfEntries][MAX_NAME_LEN] = '\0';
        numberOfEntries++;
        return 1;
    }

    return 0;
}

void printNames()
{
    for(int i = 0; i < numberOfEntries; i++)
    {
        printf("%s\n", names[i]);
    }
}

static int getNameIdx(const char *name)
{
    for(int i = 0; i < numberOfEntries; i++)
    {
        if(strcmp(name, names[i]) == 0)
            return i;
    }
    return INDEX_NOT_FOUND;
}

static void removeAt(int idx)
{
    for(int i = idx; i < numberOfEntries-1; i++)
    {
        strncpy(names[i], names[i+1], MAX_NAME_LEN+1);
        names[i][MAX_NAME_LEN] = '\0';
    }
    numberOfEntries--;
}

Status removeName(const char *name)
{
    int idx = getNameIdx(name);

    if(idx == INDEX_NOT_FOUND)
    {
        return REMOVE_ERROR;
    }
    else
    {
        removeAt(idx);
        return STATUS_OK;
    }
}

Status saveNames(const char *path)
{
    FILE *file = fopen(path, "w");

    if(file != NULL)
    {
        for(int i = 0; i < numberOfEntries; i++)
            fprintf(file, "%s\n", names[i]);
        fclose(file);

        return STATUS_OK;
    }
    else
    {
        return IO_ERROR;   
    }
}

Status loadNames(const char *path)
{
    FILE *file = fopen(path, "r");

    if(file != NULL)
    {
        char line[MAX_NAME_LEN+10];

        while(fgets(line, MAX_NAME_LEN+10, file) != NULL)
        {
            line[strcspn(line, "\n")] = '\0';
            addName(line);
        }

        return STATUS_OK;
    }
    else
    {
        return IO_ERROR;   
    }
}