#include "xdo_cmd.h"

#define WINDOWMOVE_X_CURRENT (1 << 0)
#define WINDOWMOVE_Y_CURRENT (1 << 1)
#define WINDOWMOVE_RELATIVE (1 << 2)

struct windowmove {
  Window window;
  int x;
  int y;
  int opsync;
  int flags;
};

/* This function exists because at one time I had problems embedding certain
 * blocks of code within macros (window_each). */
static int _windowmove(context_t *context, struct windowmove *windowmove);

int cmd_windowmove(context_t *context) {
  int ret = 0;
  char *cmd = *context->argv;
  struct windowmove windowmove;
  
  windowmove.x = 0;
  windowmove.y = 0;
  windowmove.opsync = 0;
  windowmove.window = CURRENTWINDOW;
  windowmove.flags = 0;

  int c;
  typedef enum {
    opt_unused, opt_help, opt_sync, opt_relative
  } optlist_t;
  static struct option longopts[] = {
    { "help", no_argument, NULL, opt_help },
    { "sync", no_argument, NULL, opt_sync },
    { "relative", no_argument, NULL, opt_relative },
    { 0, 0, 0, 0 },
  };
  static const char *usage = 
    "Usage: %s [options] [window=%1] x y\n"
    "--sync      - only exit once the window has moved\n"
    "--relative  - make movements relative to the current window position"
    "\n"
    "If you use literal 'x' or 'y' for the x coordinates, then the current\n"
    "coordinate will be used. This is useful for moving the window along\n"
    "only one axis.\n";

  int option_index;
  while ((c = getopt_long_only(context->argc, context->argv, "+h",
                               longopts, &option_index)) != -1) {
    switch (c) {
      case 'h':
      case opt_help:
        printf(usage, cmd);
        consume_args(context, context->argc);
        return EXIT_SUCCESS;
        break;
      case opt_sync:
        windowmove.opsync = 1;
        break;
      case opt_relative:
        windowmove.flags |= WINDOWMOVE_RELATIVE;
        break;
      default:
        fprintf(stderr, usage, cmd);
        return EXIT_FAILURE;
    }
  }

  consume_args(context, optind);

  const char *window_arg = "%1";

  if (!window_get_arg(context, 2, 0, &window_arg)) {
    fprintf(stderr, usage, cmd);
    return EXIT_FAILURE;
  }

  if (context->argv[0][0] == 'x') {
    windowmove.flags |= WINDOWMOVE_X_CURRENT;
  } else {
    windowmove.x = (int)strtol(context->argv[0], NULL, 0);
  }

  if (context->argv[1][0] == 'y') {
    windowmove.flags |= WINDOWMOVE_Y_CURRENT;
  } else {
    windowmove.y = (int)strtol(context->argv[1], NULL, 0);
  }

  consume_args(context, 2);  

  window_each(context, window_arg, {
      windowmove.window = window;
      _windowmove(context, &windowmove);
    }); /* window_each(...) */
  return ret;
}

static int _windowmove(context_t *context, struct windowmove *windowmove) {
  int orig_win_x = 0;
  int orig_win_y = 0;
  int ret;

  /* Grab the current position of the window if we are moving synchronously
   * or if we are moving along an axis. 
   * That is, with --sync or x or y in args were literally 'x' or 'y'
   * or if --relative is given*/
  if (windowmove->opsync || windowmove->flags != 0) {
    xdo_get_window_location(context->xdo, windowmove->window,
                            &orig_win_x, &orig_win_y, NULL);
    /* Break early if we don't need to move the window */
    if (orig_win_x == windowmove->x && orig_win_y == windowmove->y) {
      return 0;
    }
  }

  int target_x = windowmove->x;
  int target_y = windowmove->y;


  if (windowmove->flags & WINDOWMOVE_RELATIVE) {
    target_x = orig_win_x + windowmove->x;
    target_y = orig_win_y + windowmove->y;
  }

  if (windowmove->flags & WINDOWMOVE_X_CURRENT) {
    target_x = orig_win_x;
    xdotool_debug(context, "Using %d for x\n", windowmove->x);
  }

  if (windowmove->flags & WINDOWMOVE_Y_CURRENT) {
    target_y = orig_win_y;
    xdotool_debug(context, "Using %d for y\n", windowmove->y);
  }


  ret = xdo_move_window(context->xdo, windowmove->window, target_x, target_y);
  if (ret) {
    fprintf(stderr,
            "xdo_move_window reported an error while moving window %ld\n",
            windowmove->window);
  } else {
    if (windowmove->opsync) {
      /* This 'sync' request is stateful (we need to know the original window
       * location to make the decision about 'done' 
       * Some window managers force alignments or otherwise mangle move
       * requests, so we can't just look for the x,y positions exactly.
       * Just look for any change in the window's position. */
      int win_x, win_y;
      xdo_get_window_location(context->xdo, windowmove->window,
                              &win_x, &win_y, NULL);
      /* Permit imprecision to account for window borders and titlebar */
      while (orig_win_x == win_x && orig_win_y == win_y
             && abs(windowmove->x - win_x) > 10
             && abs(windowmove->y - win_y) > 50) {
        xdo_get_window_location(context->xdo, windowmove->window,
                                &win_x, &win_y, NULL);
        usleep(30000);
      }
    }
  }

  return ret;
} 
