//: Loading SubX programs from ELF binaries.
//: This will allow us to run them natively on a Linux kernel.
//: Based on https://github.com/kragen/stoneknifeforth/blob/702d2ebe1b/386.c

:(before "End Main")
assert(argc > 1);
if (is_equal(argv[1], "run")) {
  // Outside of tests, traces must be explicitly requested.
  if (Trace_file.is_open()) Trace_stream = new trace_stream;
  trace(2, "run") << "=== Starting to run" << end();
  if (argc <= 2) {
    raise << "Not enough arguments provided.\n" << die();
  }
  reset();
  cerr << std::hex;
  load_elf(argv[2], argc, argv);
  while (EIP < End_of_program)  // weak final-gasp termination check
    run_one_instruction();
  raise << "executed past end of the world: " << EIP << " vs " << End_of_program << '\n' << end();
  return 1;
}

:(code)
void load_elf(const string& filename, int argc, char* argv[]) {
  int fd = open(filename.c_str(), O_RDONLY);
  if (fd < 0) raise << filename.c_str() << ": open" << perr() << '\n' << die();
  off_t size = lseek(fd, 0, SEEK_END);
  lseek(fd, 0, SEEK_SET);
  uint8_t* elf_contents = static_cast<uint8_t*>(malloc(size));
  if (elf_contents == NULL) raise << "malloc(" << size << ')' << perr() << '\n' << die();
  ssize_t read_size = read(fd, elf_contents, size);
  if (size != read_size) raise << "read → " << size << " (!= " << read_size << ')' << perr() << '\n' << die();
  load_elf_contents(elf_contents, size, argc, argv);
  free(elf_contents);
}

void load_elf_contents(uint8_t* elf_contents, size_t size, int argc, char* argv[]) {
  uint8_t magic[5] = {0};
  memcpy(magic, elf_contents, 4);
  if (memcmp(magic, "\177ELF", 4) != 0)
    raise << "Invalid ELF file; starts with \"" << magic << '"' << die();
  if (elf_contents[4] != 1)
    raise << "Only 32-bit ELF files (4-byte words; virtual addresses up to 4GB) supported.\n" << die();
  if (elf_contents[5] != 1)
    raise << "Only little-endian ELF files supported.\n" << die();
  // unused: remaining 10 bytes of e_ident
  uint32_t e_machine_type = u32_in(&elf_contents[16]);
  if (e_machine_type != 0x00030002)
    raise << "ELF type/machine 0x" << HEXWORD << e_machine_type << " isn't i386 executable\n" << die();
  // unused: e_version. We only support version 1, and later versions will be backwards compatible.
  uint32_t e_entry = u32_in(&elf_contents[24]);
  uint32_t e_phoff = u32_in(&elf_contents[28]);
  // unused: e_shoff
  // unused: e_flags
  uint32_t e_ehsize = u16_in(&elf_contents[40]);
  if (e_ehsize < 52) raise << "Invalid binary; ELF header too small\n" << die();
  uint32_t e_phentsize = u16_in(&elf_contents[42]);
  uint32_t e_phnum = u16_in(&elf_contents[44]);
  trace(90, "load") << e_phnum << " entries in the program header, each " << e_phentsize << " bytes long" << end();
  // unused: e_shentsize
  // unused: e_shnum
  // unused: e_shstrndx

  set<uint32_t> overlap;  // to detect overlapping segments
  for (size_t i = 0;  i < e_phnum;  ++i)
    load_segment_from_program_header(elf_contents, i, size, e_phoff + i*e_phentsize, e_ehsize, overlap);

  // initialize code and stack
  assert(overlap.find(STACK_SEGMENT) == overlap.end());
  Mem.push_back(vma(STACK_SEGMENT));
  assert(overlap.find(AFTER_STACK) == overlap.end());
  // The stack grows downward.
  Reg[ESP].u = AFTER_STACK;
  Reg[EBP].u = 0;
  EIP = pre { line-height: 125%; }
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.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
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/*
 * log.c
 *
 * Copyright (C) 2012, 2013 James Booth <boothj5@gmail.com>
 *
 * This file is part of Profanity.
 *
 * Profanity is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Profanity is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Profanity.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "glib.h"

#include "log.h"

#include "common.h"
#include "config/preferences.h"

#define PROF "prof"

static FILE *logp;

static GTimeZone *tz;
static GDateTime *dt;
static log_level_t level_filter;

static GHashTable *logs;
static GHashTable *groupchat_logs;
static GDateTime *session_started;

struct dated_chat_log {
    gchar *filename;
    GDateTime *date;
};

static gboolean _log_roll_needed(struct dated_chat_log *dated_log);
static struct dated_chat_log * _create_log(char *other, const  char * const login);
static struct dated_chat_log * _create_groupchat_log(char *room, const char * const login);
static void _free_chat_log(struct dated_chat_log *dated_log);
static gboolean _key_equals(void *key1, void *key2);
static char * _get_log_filename(const char * const other, const char * const login,
    GDateTime *dt, gboolean create);
static char * _get_groupchat_log_filename(const char * const room,
    const char * const login, GDateTime *dt, gboolean create);
static gchar * _get_chatlog_dir(void);
static gchar * _get_log_file(void);
static void _rotate_log_file(void);

void
log_debug(const char * const msg, ...)
{
    va_list arg;
    va_start(arg, msg);
    GString *fmt_msg = g_string_new(NULL);
    g_string_vprintf(fmt_msg, msg, arg);
    log_msg(PROF_LEVEL_DEBUG, PROF, fmt_msg->str);
    g_string_free(fmt_msg, TRUE);
    va_end(arg);
}

void
log_info(const char * const msg, ...)
{
    va_list arg;
    va_start(arg, msg);
    GString *fmt_msg = g_string_new(NULL);
    g_string_vprintf(fmt_msg, msg, arg);
    log_msg(PROF_LEVEL_INFO, PROF, fmt_msg->str);
    g_string_free(fmt_msg, TRUE);
    va_end(arg);
}

void
log_warning(const char * const msg, ...)
{
    va_list arg;
    va_start(arg, msg);
    GString *fmt_msg = g_string_new(NULL);
    g_string_vprintf(fmt_msg, msg, arg);
    log_msg(PROF_LEVEL_WARN, PROF, fmt_msg->str);
    g_string_free(fmt_msg, TRUE);
    va_end(arg);
}

void
log_error(const char * const msg, ...)
{
    va_list arg;
    va_start(arg, msg);
    GString *fmt_msg = g_string_new(NULL);
    g_string_vprintf(fmt_msg, msg, arg);
    log_msg(PROF_LEVEL_ERROR, PROF, fmt_msg->str);
    g_string_free(fmt_msg, TRUE);
    va_end(arg);
}

void
log_init(log_level_t filter)
{
    level_filter = filter;
    tz = g_time_zone_new_local();
    gchar *log_file = _get_log_file();
    logp = fopen(log_file, "a");
    free(log_file);
}

log_level_t
log_get_filter(void)
{
    return level_filter;
}

void
log_close(void)
{
    g_time_zone_unref(tz);
    if (logp != NULL) {
        fclose(logp);
    }
}

void
log_msg(log_level_t level, const char * const area, const char * const msg)
{
    if (level >= level_filter && logp != NULL) {
        long result;
        dt = g_date_time_new_now(tz);

        gchar *date_fmt = g_date_time_format(dt, "%d/%m/%Y %H:%M:%S");
        fprintf(logp, "%s: %s: %s\n", date_fmt, area, msg);
        g_date_time_unref(dt);

        fflush(logp);
        g_free(date_fmt);

        result = ftell(logp);
        if (result != -1 && result >= prefs_get_max_log_size()) {
            _rotate_log_file();
        }
    }
}

log_level_t
log_level_from_string(char *log_level)
{
    assert(log_level != NULL);
    if (strcmp(log_level, "DEBUG") == 0) {
        return PROF_LEVEL_DEBUG;
    } else if (strcmp(log_level, "INFO") == 0) {
        return PROF_LEVEL_INFO;
    } else if (strcmp(log_level, "WARN") == 0) {
        return PROF_LEVEL_WARN;
    } else if (strcmp(log_level, "ERROR") == 0) {
        return PROF_LEVEL_ERROR;
    } else { // default to info
        return PROF_LEVEL_INFO;
    }
}

static void
_rotate_log_file(void)
{
    gchar *log_file = _get_log_file();
    size_t len = strlen(log_file);
    char *log_file_new = malloc(len + 3);

    strncpy(log_file_new, log_file, len);
    log_file_new[len] = '.';
    log_file_new[len+1] = '1';
    log_file_new[len+2] = 0;

    log_close();
    rename(log_file, log_file_new);
    log_init(log_get_filter());

    free(log_file_new);
    free(log_file);
    log_info("Log has been rotated");
}

void
chat_log_init(void)
{
    session_started = g_date_time_new_now_local();
    log_info("Initialising chat logs");
    logs = g_hash_table_new_full(g_str_hash, (GEqualFunc) _key_equals, g_free,
        (GDestroyNotify)_free_chat_log);
}

void
groupchat_log_init(void)
{
    log_info("Initialising groupchat logs");
    groupchat_logs = g_hash_table_new_full(g_str_hash, (GEqualFunc) _key_equals, g_free,
        (GDestroyNotify)_free_chat_log);
}

void
chat_log_chat(const gchar * const login, gchar *other,
    const gchar * const msg, chat_log_direction_t direction, GTimeVal *tv_stamp)
{
    struct dated_chat_log *dated_log = g_hash_table_lookup(logs, other);

    // no log for user
    if (dated_log == NULL) {
        dated_log = _create_log(other, login);
        g_hash_table_insert(logs, strdup(other), dated_log);

    // log exists but needs rolling
    } else if (_log_roll_needed(dated_log)) {
        dated_log = _create_log(other, login);
        g_hash_table_replace(logs, strdup(other), dated_log);
    }

    gchar *date_fmt = NULL;
    GDateTime *dt = NULL;
    if (tv_stamp == NULL) {
        dt = g_date_time_new_now_local();
    } else {
        dt = g_date_time_new_from_timeval_utc(tv_stamp);
    }

    date_fmt = g_date_time_format(dt, "%H:%M:%S");

    FILE *logp = fopen(dated_log->filename, "a");
    if (logp != NULL) {
        if (direction == PROF_IN_LOG) {
            if (strncmp(msg, "/me ", 4) == 0) {
                fprintf(logp, "%s - *%s %s\n", date_fmt, other, msg + 4);
            } else {
                fprintf(logp, "%s - %s: %s\n", date_fmt, other, msg);
            }
        } else {
            if (strncmp(msg, "/me ", 4) == 0) {
                fprintf(logp, "%s - *me %s\n", date_fmt, msg + 4);
            } else {
                fprintf(logp, "%s - me: %s\n", date_fmt, msg);
            }
        }
        fflush(logp);
        int result = fclose(logp);
        if (result == EOF) {
            log_error("Error closing file %s, errno = %d", dated_log->filename, errno);
        }
    }

    g_free(date_fmt);
    g_date_time_unref(dt);
}

void
groupchat_log_chat(const gchar * const login, const gchar * const room,
    const gchar * const nick, const gchar * const msg)
{
    gchar *room_copy = strdup(room);
    struct dated_chat_log *dated_log = g_hash_table_lookup(groupchat_logs, room_copy);

    // no log for room
    if (dated_log == NULL) {
        dated_log = _create_groupchat_log(room_copy, login);
        g_hash_table_insert(groupchat_logs, room_copy, dated_log);

    // log exists but needs rolling
    } else if (_log_roll_needed(dated_log)) {
        dated_log = _create_groupchat_log(room_copy, login);
        g_hash_table_replace(logs, room_copy, dated_log);
    }

    GDateTime *dt = g_date_time_new_now_local();

    gchar *date_fmt = g_date_time_format(dt, "%H:%M:%S");

    FILE *logp = fopen(dated_log->filename, "a");
    if (logp != NULL) {
        if (strncmp(msg, "/me ", 4) == 0) {
            fprintf(logp, "%s - *%s %s\n", date_fmt, nick, msg + 4);
        } else {
            fprintf(logp, "%s - %s: %s\n", date_fmt, nick, msg);
        }

        fflush(logp);
        int result = fclose(logp);
        if (result == EOF) {
            log_error("Error closing file %s, errno = %d", dated_log->filename, errno);
        }
    }

    g_free(date_fmt);
    g_date_time_unref(dt);
}


GSList *
chat_log_get_previous(const gchar * const login, const gchar * const recipient,
    GSList *history)
{
    GDateTime *now = g_date_time_new_now_local();
    GDateTime *log_date = g_date_time_new(tz,
        g_date_time_get_year(session_started),
        g_date_time_get_month(session_started),
        g_date_time_get_day_of_month(session_started),
        g_date_time_get_hour(session_started),
        g_date_time_get_minute(session_started),
        g_date_time_get_second(session_started));

    // get data from all logs from the day the session was started to today
    while (g_date_time_compare(log_date, now) != 1) {
        char *filename = _get_log_filename(recipient, login, log_date, FALSE);

        FILE *logp = fopen(filename, "r");
        char *line;
        if (logp != NULL) {
            GString *gs_header = g_string_new("");
            g_string_append_printf(gs_header, "%d/%d/%d:",
                g_date_time_get_day_of_month(log_date),
                g_date_time_get_month(log_date),
                g_date_time_get_year(log_date));
            char *header = strdup(gs_header->str);
            history = g_slist_append(history, header);
            g_string_free(gs_header, TRUE);

            while ((line = prof_getline(logp)) != NULL) {
                history = g_slist_append(history, line);
            }

            fclose(logp);
        }

        free(filename);
        GDateTime *next = g_date_time_add_days(log_date, 1);
        g_date_time_unref(log_date);
        log_date = g_date_time_ref(next);
    }

    return history;
}

void
chat_log_close(void)
{
    g_hash_table_remove_all(logs);
    g_hash_table_remove_all(groupchat_logs);
    g_date_time_unref(session_started);
}

static struct dated_chat_log *
_create_log(char *other, const char * const login)
{
    GDateTime *now = g_date_time_new_now_local();
    char *filename = _get_log_filename(other, login, now, TRUE);

    struct dated_chat_log *new_log = malloc(sizeof(struct dated_chat_log));
    new_log->filename = strdup(filename);
    new_log->date = now;

    free(filename);

    return new_log;
}

static struct dated_chat_log *
_create_groupchat_log(char *room, const char * const login)
{
    GDateTime *now = g_date_time_new_now_local();
    char *filename = _get_groupchat_log_filename(room, login, now, TRUE);

    struct dated_chat_log *new_log = malloc(sizeof(struct dated_chat_log));
    new_log->filename = strdup(filename);
    new_log->date = now;

    free(filename);

    return new_log;
}

static gboolean
_log_roll_needed(struct dated_chat_log *dated_log)
{
    gboolean result = FALSE;
    GDateTime *now = g_date_time_new_now_local();
    if (g_date_time_get_day_of_year(dated_log->date) !=
            g_date_time_get_day_of_year(now)) {
        result = TRUE;
    }
    g_date_time_unref(now);

    return result;
}

static void
_free_chat_log(struct dated_chat_log *dated_log)
{
    if (dated_log != NULL) {
        if (dated_log->filename != NULL) {
            g_free(dated_log->filename);
            dated_log->filename = NULL;
        }
        if (dated_log->date != NULL) {
            g_date_time_unref(dated_log->date);
            dated_log->date = NULL;
        }
        free(dated_log);
    }
}

static
gboolean _key_equals(void *key1, void *key2)
{
    gchar *str1 = (gchar *) key1;
    gchar *str2 = (gchar *) key2;

    return (g_strcmp0(str1, str2) == 0);
}

static char *
_get_log_filename(const char * const other, const char * const login,
    GDateTime *dt, gboolean create)
{
    gchar *chatlogs_dir = _get_chatlog_dir();
    GString *log_file = g_string_new(chatlogs_dir);
    free(chatlogs_dir);

    gchar *login_dir = str_replace(login, "@", "_at_");
    g_string_append_printf(log_file, "/%s", login_dir);
    if (create) {
        create_dir(log_file->str);
    }
    free(login_dir);

    gchar *other_file = str_replace(other, "@", "_at_");
    g_string_append_printf(log_file, "/%s", other_file);
    if (create) {
        create_dir(log_file->str);
    }
    free(other_file);

    gchar *date = g_date_time_format(dt, "/%Y_%m_%d.log");
    g_string_append(log_file, date);
    g_free(date);

    char *result = strdup(log_file->str);
    g_string_free(log_file, TRUE);

    return result;
}

static char *
_get_groupchat_log_filename(const char * const room, const char * const login,
    GDateTime *dt, gboolean create)
{
    gchar *chatlogs_dir = _get_chatlog_dir();
    GString *log_file = g_string_new(chatlogs_dir);
    g_free(chatlogs_dir);

    gchar *login_dir = str_replace(login, "@", "_at_");
    g_string_append_printf(log_file, "/%s", login_dir);
    if (create) {
        create_dir(log_file->str);
    }
    free(login_dir);

    g_string_append(log_file, "/rooms");
    if (create) {
        create_dir(log_file->str);
    }

    gchar *room_file = str_replace(room, "@", "_at_");
    g_string_append_printf(log_file, "/%s", room_file);
    if (create) {
        create_dir(log_file->str);
    }
    free(room_file);

    gchar *date = g_date_time_format(dt, "/%Y_%m_%d.log");
    g_string_append(log_file, date);
    g_free(date);

    char *result = strdup(log_file->str);
    g_string_free(log_file, TRUE);

    return result;
}

static gchar *
_get_chatlog_dir(void)
{
    gchar *xdg_data = xdg_get_data_home();
    GString *chatlogs_dir = g_string_new(xdg_data);
    g_string_append(chatlogs_dir, "/profanity/chatlogs");
    gchar *result = strdup(chatlogs_dir->str);
    free(xdg_data);
    g_string_free(chatlogs_dir, TRUE);

    return result;
}

static gchar *
_get_log_file(void)
{
    gchar *xdg_data = xdg_get_data_home();
    GString *logfile = g_string_new(xdg_data);
    g_string_append(logfile, "/profanity/logs/profanity.log");
    gchar *result = strdup(logfile->str);
    free(xdg_data);
    g_string_free(logfile, TRUE);

    return result;
}