#include <sys/stat.h>
#include "../inc/sanity.h"
#include "../inc/fex.h"
#include "../inc/nprint.h"
#include "../inc/config.h"

/*
 * Uses bitwise operations to determine the sanity of the system's directory hierarchy. In particular, it checks if the directories of
 * /con
 * /exe
 * /uti
 * /uti/lib
 * /uti/hdr
 * exist, and if the owner can write to them. This notably does not check if the program is run as superuser.
 */

int isSysSane() {
    struct stat conStat, exeStat, utiStat, libStat, hdrStat;
    int result = 0;

    char* directoryNames[] = {"/con", "/exe", "/uti", "/uti/lib", "/uti/hdr"};
    struct stat* statVars[] = {&conStat, &exeStat, &utiStat, &libStat, &hdrStat};
    int flags[] = {SANITY_CON_FAIL, SANITY_EXE_FAIL, SANITY_UTI_FAIL, SANITY_LIB_FAIL, SANITY_HDR_FAIL};
    const int numDirectories = sizeof(directoryNames) / sizeof(directoryNames[0]);

    for(int i = 0; i < numDirectories; i++) {
        if(stat(directoryNames[i], statVars[i]) != 0 || !(statVars[i]->st_mode & S_IWUSR)) {
            result |= flags[i];
        }
    };

    return result;
}

int isSyntaxSane(unsigned int flags, int pkgCount) {
    if((flags & FLAG_INSTALL) && (flags & FLAG_REMOVE)) {
        nprint("E", "You cannot install and uninstall at the same time"); // Sequential parsing of flags would leave so many ambiguous cases and expand these checks greatly. Not worth it without extensive research
        return ERROR;
    }

    if((flags & FLAG_INSTALL) && (pkgCount == 0)) {
        nprint("E", "You must specify at least one package");
        return ERROR;
    }

    if(flags == FLAG_FORCE) {
        nprint("E", "Force may not be used alone");
        return ERROR;
    }

    if(/*(flags == FLAG_LIST) || */flags == FLAG_SEARCH) {
        nprint("E", "List and search must be used alone");
        return ERROR;
    }

    return OK;
}