/**********************************************************************
 * File:        errcode.cpp  (Formerly error.c)
 * Description: Generic error handler function
 * Author:      Ray Smith
 * Created:     Tue May  1 16:28:39 BST 1990
 *
 * (C) Copyright 1989, Hewlett-Packard Ltd.
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 ** http://www.apache.org/licenses/LICENSE-2.0
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 *
 **********************************************************************/

#include "globaloc.h"
#include <csignal>
#ifdef __linux__
#include <sys/syscall.h>   // For SYS_gettid.
#include <unistd.h>        // For syscall itself.
#endif
#include "allheaders.h"
#include "errcode.h"
#include "tprintf.h"

// Size of thread-id array of pixes to keep in case of crash.
const int kMaxNumThreadPixes = 32768;

static Pix* global_crash_pixes[kMaxNumThreadPixes];

void SavePixForCrash(int resolution, Pix* pix) {
#ifdef __linux__
#ifndef ANDROID
  int thread_id = syscall(SYS_gettid) % kMaxNumThreadPixes;
#else
  int thread_id = gettid() % kMaxNumThreadPixes;
#endif
  pixDestroy(&global_crash_pixes[thread_id]);
  if (pix != nullptr) {
    Pix* clone = pixClone(pix);
    pixSetXRes(clone, resolution);
    pixSetYRes(clone, resolution);
    global_crash_pixes[thread_id] = clone;
  }
#endif
}

// CALL ONLY from a signal handler! Writes a crash image to stderr.
void signal_exit(int signal_code) {
  tprintf("Received signal %d!\n", signal_code);
#ifdef __linux__
#ifndef ANDROID
  int thread_id = syscall(SYS_gettid) % kMaxNumThreadPixes;
#else
  int thread_id = gettid() % kMaxNumThreadPixes;
#endif
  if (global_crash_pixes[thread_id] != nullptr) {
    fprintf(stderr, "Crash caused by image with resolution %d\n",
            pixGetYRes(global_crash_pixes[thread_id]));
    fprintf(stderr, "<Cut here>\n");
    pixWriteStreamPng(stderr, global_crash_pixes[thread_id], 0.0);
    fprintf(stderr, "\n<End cut>\n");
  }
  // Raise an uncaught signal, so as to get a useful stack trace.
  raise(SIGILL);
#else
  abort();
#endif
}

void err_exit() {
  ASSERT_HOST("Fatal error encountered!" == nullptr);
}

// TODO: remove empty function?
void set_global_loc_code(int loc_code) {
  // global_loc_code = loc_code;
}

// TODO: remove empty function?
void set_global_subloc_code(int loc_code) {
  // global_subloc_code = loc_code;
}

// TODO: remove empty function?
void set_global_subsubloc_code(int loc_code) {
  // global_subsubloc_code = loc_code;
}