#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include <semaphore.h>
#include <string.h>
#include <ncurses.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <mqueue.h>
#include <signal.h>

#include "ui.h"
#include "ui_elements.h"
#include "ui_ani.h"
#include "ui_input.h"
#include "ui_statusbar.h"
#include "ui_nwindow.h"

#include "status.h"
#include "config.h"

#define APP_TIMEOUT 60
#define APP_TIMEOUT_FMT "%02d"
#define PASSWD_WIDTH 35
#define PASSWD_HEIGHT 5
#define PASSWD_XRELPOS (unsigned int)(PASSWD_WIDTH / 2) - (PASSWD_WIDTH / 6)
#define PASSWD_YRELPOS (unsigned int)(PASSWD_HEIGHT / 2) + 1
#define INFOWND_WIDTH 25
#define INFOWND_HEIGHT 3
#define INFOWND_XRELPOS (unsigned int)(INFOWND_WIDTH / 2) - (INFOWND_WIDTH / 6)
#define INFOWND_YRELPOS (unsigned int)(INFOWND_HEIGHT / 2) + 1

#define STRLEN(s) (sizeof(s)/sizeof(s[0]))


static unsigned int max_x, max_y;
static WINDOW *wnd_main;
static struct nask_ui *nui = NULL;
static struct nask_input *nin = NULL;
static pthread_t thrd;
static unsigned int atmout = APP_TIMEOUT;
static pthread_cond_t cnd_update = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t mtx_update = PTHREAD_MUTEX_INITIALIZER;
static sem_t sem_rdy;
static sem_t /* TUI active? */ *sp_ui, /* Textfield input available? */ *sp_input;
static mqd_t mq_passwd, mq_info;


void
register_ui_elt(ui_callback uicb, void *data, WINDOW *wnd)
{
  struct nask_ui *tmp, *new;

  if (nui != NULL) {
    tmp = nui;
    while (tmp->next != NULL) {
     tmp = tmp->next;
    }
  }
  new = calloc(1, sizeof(struct nask_ui));
  new->ui_elt_cb = uicb;
  new->wnd = wnd;
  new->data = data;
  new->next = NULL;
  if (nui == NULL) {
    nui = new;
    nui->next = NULL;
  } else {
    tmp->next = new;
  }
}

void
register_input(ui_input_callback ipcb, void *data, WINDOW *wnd)
{
  
}

void
unregister_ui_elt(void *data)
{
  struct nask_ui *cur = nui, *next, *before = NULL;

  while (cur != NULL) {
    next = cur->next;
    if (cur->data != NULL && cur->data == data) {
      free(cur);
      if (before != NULL) {
        before->next = next;
      } else {
        nui = next;
      }
    }
    before = cur;
    cur = next;
  }
}

static int
do_ui_update(bool timed_out)
{
  int retval = UICB_OK;
  int curx = getcurx(wnd_main);
  int cury = getcury(wnd_main);
  struct nask_ui *cur = nui;

  /* call all draw callback's */
  erase();
  while (cur != NULL) {
    if (cur->ui_elt_cb != NULL) {
      cur->ui_elt_cb(cur->wnd, cur->data, timed_out);
      doupdate();
    } else {
      retval = UICB_ERR_CB;
    }
    cur = cur->next;
  }
  /* TODO: Maybe export to an extra module? */
  attron(COLOR_PAIR(1));
  mvprintw(0, max_x - STRLEN(APP_TIMEOUT_FMT), "[" APP_TIMEOUT_FMT "]", atmout);
  attroff(COLOR_PAIR(1));
  /* EoT (End of Todo) */
  wmove(wnd_main, cury, curx);
  wrefresh(wnd_main);
  return (retval);
}

static void *
ui_thrd(void *arg)
{
  int cnd_ret, i_sval;
  struct timeval now;
  struct timespec wait;

  gettimeofday(&now, NULL);
  wait.tv_sec = now.tv_sec + UILOOP_TIMEOUT;
  wait.tv_nsec = now.tv_usec * 1000;
  do_ui_update(true);
  sem_post(&sem_rdy);
  while ( sem_getvalue(sp_ui, &i_sval) == 0 && i_sval > 0 ) {
    pthread_mutex_lock(&mtx_update);
    cnd_ret = pthread_cond_timedwait(&cnd_update, &mtx_update, &wait);
    if (--atmout == 0) sem_trywait(sp_ui);
    do_ui_update( (cnd_ret == ETIMEDOUT ? true : false) );
    if (cnd_ret == ETIMEDOUT) {
      wait.tv_sec += UILOOP_TIMEOUT;
    }
    pthread_mutex_unlock(&mtx_update);
  }
  pthread_mutex_unlock(&mtx_update);
  return (NULL);
}

void
ui_thrd_force_update(void)
{
  pthread_mutex_lock(&mtx_update);
  pthread_cond_signal(&cnd_update);
  pthread_mutex_unlock(&mtx_update);
}

WINDOW *
init_ui(void)
{
  wnd_main = initscr();
  max_x = getmaxx(wnd_main);
  max_y = getmaxy(wnd_main);
  start_color();
  init_pair(1, COLOR_RED, COLOR_WHITE);
  init_pair(2, COLOR_WHITE, COLOR_BLACK);
  init_pair(3, COLOR_BLACK, COLOR_WHITE);
  init_pair(4, COLOR_YELLOW, COLOR_RED);
  raw();
  keypad(stdscr, TRUE);
  noecho();
  cbreak();
  return (wnd_main);
}

void
free_ui(void)
{
  delwin(wnd_main);
  endwin();
  clear();
  printf(" \033[2J\n");
}

static int
run_ui_thrd(void) {
  return (pthread_create(&thrd, NULL, &ui_thrd, NULL));
}

static int
stop_ui_thrd(void)
{
  return (pthread_join(thrd, NULL));
}

static int
mq_passwd_send(char *passwd, size_t len)
{
  struct mq_attr m_attr;

  sem_post(sp_input);
  if (mq_send(mq_passwd, passwd, len, 0) == 0 && mq_getattr(mq_passwd, &m_attr) == 0) {
    return m_attr.mq_curmsgs;
  }
  memset(passwd, '\0', len);
  return -1;
}

static bool
process_key(char key, struct input *a, WINDOW *win)
{
  bool retval = true;

  atmout = APP_TIMEOUT;
  switch (key) {
    case UIKEY_ENTER:
      if ( mq_passwd_send(a->input, a->input_len) > 0 ) {
        retval = false;
      } else retval = true;
      break;
    case UIKEY_BACKSPACE:
      del_input(win, a);
      break;
    case UIKEY_ESC:
      retval = false;
      break;
    case UIKEY_DOWN:
    case UIKEY_UP:
    case UIKEY_LEFT:
    case UIKEY_RIGHT:
      break;
    default:
      add_input(win, a, key);
  }
  return (retval);
}

int
do_ui(void)
{
  struct anic *heartbeat;
  char key = '\0';
  char *title = NULL, mq_msg[IPC_MQSIZ+1];
  int i_sval = -1, ret = DOUI_ERR;

  asprintf(&title, "/* %s-%s */", PKGNAME, VERSION);
  sp_ui = sem_open(SEM_GUI, 0, 0, 0);
  sp_input = sem_open(SEM_INP, 0, 0, 0);
  mq_passwd = mq_open(MSQ_PWD, O_WRONLY, 0, NULL);
  mq_info = mq_open(MSQ_INF, O_RDONLY, 0, NULL);
  if ( sem_init(&sem_rdy, 0, 0) == -1 || !sp_ui || !sp_input || mq_passwd == (mqd_t)-1 || mq_info == (mqd_t)-1 ) {
    perror("init semaphore/messageq");
    goto error;
  }

  /* init TUI and UI Elements (input field, status bar, etc) */
  init_ui();
  init_ui_elements(wnd_main, max_x, max_y);

  if (run_ui_thrd() != 0) {
    goto error;
  }
  sem_wait(&sem_rdy);
  wtimeout(wnd_main, 1000);
  while ( sem_getvalue(sp_ui, &i_sval) == 0 && i_sval > 0 ) {
    if ((key = wgetch(wnd_main)) == '\0') {
      break;
    }
    if (key == -1) {
      continue;
    }
    if ( process_key(key, pw_input, wnd_main) == false ) {
      curs_set(0);
      memset(mq_msg, '\0', IPC_MQSIZ+1);
      mq_receive(mq_info, mq_msg, IPC_MQSIZ+1, 0);
      set_txtwindow_text(infownd, mq_msg);
      set_txtwindow_active(infownd, true);
      sleep(3);
      sem_trywait(sp_ui);
    }
    activate_input(wnd_main, pw_input);
    do_ui_update(false);
  }
  ui_thrd_force_update();
  stop_ui_thrd();
  free_ui_elements();

  ret = DOUI_OK;
  mq_close(mq_passwd);
  mq_close(mq_info);
error:
  if (title) free(title);
  if (sp_ui) sem_close(sp_ui);
  if (sp_input) sem_close(sp_input);
  title = NULL;
  sp_ui = NULL;
  sp_input = NULL;
  return ret;
}