#include "spm.h"

int spmerrno = 0;
static char spmerrbuf[255];
static char spmerrbuf_reason[255];
const char *SPM_ERR_STRING[] = {
        "Success",
        "No root record",
        "Dangerous root path",
        "Package not found",
        "Invalid package",
        "Bad package checksum",
        "Failed to fetch package",
        "Manifest has no header",
        "Manifest has no data",
        NULL,
};

/**
 * Append error text to an existing spmerrno error string
 * @param reason message text
 */
void spmerrno_cause(const char *reason) {
    char *buf = spmerrbuf_reason;
    if (reason != NULL) {
        sprintf(buf, " (%s)", reason);
    }
}

/**
 * Translate a spmerrno code to an error string
 * @param code
 * @return
 */
char *spm_strerror(int code) {
    char *buf = spmerrbuf;
    int is_spm_error = SPM_ERR_CONFIRM(code);

    memset(buf, '\0', sizeof(spmerrbuf));
    if (is_spm_error == 0) {
        strcpy(buf, strerror(code));
    } else {
        strcpy(buf, SPM_ERR_STRING[SPM_ERR_INDEX(code)]);
    }

    if (strlen(spmerrbuf_reason)) {
        strcat(buf, spmerrbuf_reason);
    }
    return buf;
}

void spm_perror(const char *msg) {
    fprintf(stderr, "%s: %s\n", msg ? msg : "", spm_strerror(spmerrno));
}