#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "fuse.h"
#include "fsactions.h"
#include "fsinterface.h"

/*
 *  Steps to formatting inodes:
 *      1) Check if file exists already in directory
 *      2) If file does not exist in directory, provide new inode
 *      3) Inodes are placed inside of inodes that are directories
 *
 */

// TODO:    Take BlockStruct out of InodeStruct
//          Make a method for turning names into Inodes

// Main handler for Fuse
void Fuse(int argc, char* argv[])
{
    FileSystem* fsptr;
    fuseArgStruct fuseArgs;
    GetArguments(argc, argv, &fuseArgs);
    OpenFS(&fuseArgs, argv[0]);
    fsptr = SetupFS(&fuseArgs);
    RunFuse(fsptr, &fuseArgs);
    TearDownFS();
}

// Gets command line arguments and puts information into fuseArgs
void GetArguments(int argc, char* argv[], fuseArgStruct* fuseArgs)
{
    for (int i = 0; i < argc; i++)
    {
        if (argv[i][0] == '-' && argv[i][1] == 'l')
            fuseArgs->list = 1;
        if (argv[i][0] == '-' && argv[i][1] == 'a')
        {
            fuseArgs->add = 1;
            fuseArgs->toAdd = strdup(argv[i+1]);
        }
        if (argv[i][0] == '-' && argv[i][1] == 'r')
        {
            fuseArgs->remove = 1;
            fuseArgs->toRemove = strdup(argv[i+1]);
        }
        if (argv[i][0] == '-' && argv[i][1] == 'e')
        {
            fuseArgs->extract = 1;
            fuseArgs->toExtract = strdup(argv[i+1]);
        }
        if (argv[i][0] == '-' && argv[i][1] == 'f')
        {
            fuseArgs->filefsname = 1;
            fuseArgs->fsname = strdup(argv[i+1]);
        }
    }
}

// Runs the fuse functions that were previously marked
void RunFuse(FileSystem* fs, fuseArgStruct* fuseArgs)
{
    if (fuseArgs->add)
        AddFileToFS(fs, fuseArgs->toAdd);
    if (fuseArgs->remove)
        RemoveFileFromFS(fs, fuseArgs->toRemove);
    if (fuseArgs->extract)
        ExtractFileFromFS(fs, fuseArgs->toExtract);
    if(fuseArgs->list)
        ListFS(fs);
    return;
}

// Initialize entire fuseStruct
void FuseStructInit(fuseArgStruct* fuseStruct)
{
    fuseStruct->create = 0;
    fuseStruct->list = 0;
    fuseStruct->add = 0;
    fuseStruct->remove = 0;
    fuseStruct->extract = 0;
    fuseStruct->toAdd = NULL;
    fuseStruct->toRemove = NULL;
    fuseStruct->toExtract = NULL;
    fuseStruct->fsname = NULL;
    fuseStruct->fd = -1;
    fuseStruct->newfs = 0;
    fuseStruct->filefsname = 0;
    return;
}

// Print error if usage is wrong
void FuseUsageError(char* programPath)
{
    fprintf(stderr, "Usage %s [-l] [-a path] [-e path] [-r path] -f name\n",
            programPath);
    exit(EXIT_FAILURE);
}