/*
 * ion/ioncore/kbresize.c
 *
 * Copyright (c) Tuomo Valkonen 1999-2007.
 *
 * See the included file LICENSE for details.
 */

#include <math.h>
#include <sys/time.h>
#include <time.h>
#include <limits.h>

#include <libtu/minmax.h>

#include <libmainloop/signal.h>

#include "global.h"
#include "resize.h"
#include "kbresize.h"
#include "grab.h"
#include "binding.h"
#include "focus.h"
#include "bindmaps.h"


/*{{{ Resize accelerator */


static struct timeval last_action_tv={-1, 0};
static struct timeval last_update_tv={-1, 0};
static int last_accel_mode=0;
static double accel=1, accelinc=30, accelmax=100*100;
static long actmax=200, uptmin=50;
static int resize_delay=CF_RESIZE_DELAY;


static void accel_reset()
{
    last_accel_mode=0;
    accel=1.0;
    last_action_tv.tv_sec=-1;
    last_action_tv.tv_usec=-1;
}


void ioncore_set_moveres_accel(ExtlTab tab)
{
    int t_max, t_min, rd;
    double step, maxacc;

    if(extl_table_gets_i(tab, "kbresize_t_max", &t_max))
       actmax=(t_max>0 ? t_max : INT_MAX);
    if(extl_table_gets_i(tab, "kbresize_t_min", &t_min))
       uptmin=(t_min>0 ? t_min : INT_MAX);
    if(extl_table_gets_d(tab, "kbresize_step", &step))
       accelinc=(step>0 ? step : 1);
    if(extl_table_gets_d(tab, "kbresize_maxacc", &maxacc))
       accelmax=(maxacc>0 ? maxacc*maxacc : 1);
    if(extl_table_gets_i(tab, "kbresize_delay", &rd))
        resize_delay=MAXOF(0, rd);
}


void ioncore_get_moveres_accel(ExtlTab tab)
{
    extl_table_sets_i(tab, "kbresize_t_max", actmax),
    extl_table_sets_i(tab, "kbresize_t_min", uptmin);
    extl_table_sets_d(tab, "kbresize_step", accelinc);
    extl_table_sets_d(tab, "kbresize_maxacc", accelmax);
    extl_table_sets_d(tab, "kbresize_delay", resize_delay);
}


static int sign(int x)
{
    return (x>0 ? 1 : (x<0 ? -1 : 0));
}


static long tvdiffmsec(struct timeval *tv1, struct timeval *tv2)
{
    double t1=1000*(double)tv1->tv_sec+(double)tv1->tv_usec/1000;
    double t2=1000*(double)tv2->tv_sec+(double)tv2->tv_usec/1000;

    return (int)(t1-t2);
}

void moveresmode_accel(WMoveresMode *UNUSED(mode), int *wu, int *hu, int accel_mode)
{
    struct timeval tv;
    long adiff, udiff;

    gettimeofday(&tv, NULL);

    adiff=tvdiffmsec(&tv, &last_action_tv);
    udiff=tvdiffmsec(&tv, &last_update_tv);

    if(last_accel_mode==accel_mode && adiff<actmax){
        if(udiff>uptmin){
            accel+=accelinc;
            if(accel>accelmax)
                accel=accelmax;
            last_update_tv=tv;
        }
    }else{
        accel=1.0;
        last_update_tv=tv;
    }

    last_accel_mode=accel_mode;
    last_action_tv=tv;

    if(*wu!=0)
        *wu=(*wu)*ceil(sqrt(accel)/abs(*wu));
    if(*hu!=0)
        *hu=(*hu)*ceil(sqrt(accel)/abs(*hu));
}


/*}}}*/


/*{{{ Keyboard resize handler */


static ExtlExportedFn *moveres_safe_fns[]={
    (ExtlExportedFn*)&moveresmode_resize,
    (ExtlExportedFn*)&moveresmode_move,
    (ExtlExportedFn*)&moveresmode_rqgeom_extl,
    (ExtlExportedFn*)&moveresmode_geom,
    (ExtlExportedFn*)&moveresmode_finish,
    (ExtlExportedFn*)&moveresmode_cancel,
    NULL
};

static ExtlSafelist moveres_safelist=EXTL_SAFELIST_INIT(moveres_safe_fns);


static bool resize_handler(WRegion *reg, XEvent *xev)
{
    XKeyEvent *ev=&xev->xkey;
    WBinding *binding=NULL;
    WMoveresMode *mode;

    if(ev->type==KeyRelease)
        return FALSE;

    if(reg==NULL)
        return FALSE;

    mode=moveres_mode(reg);

    if(mode==NULL)
        return FALSE;

    binding=bindmap_lookup_binding(ioncore_moveres_bindmap,
                                   BINDING_KEYPRESS,
                                   ev->state, ev->keycode);

    if(!binding)
        return FALSE;

    if(binding!=NULL){
        extl_protect(&moveres_safelist);
        extl_call(binding->func, "oo", NULL, mode, reg);
        extl_unprotect(&moveres_safelist);
    }

    return (moveres_mode(reg)==NULL);
}


/*}}}*/


/*{{{ Resize timer */


static WTimer *resize_timer=NULL;


static void tmr_end_resize(WTimer *UNUSED(unused), WMoveresMode *mode)
{
    if(mode!=NULL)
        moveresmode_cancel(mode);
}


static bool setup_resize_timer(WMoveresMode *mode)
{
    if(resize_timer==NULL){
        resize_timer=create_timer();
        if(resize_timer==NULL)
            return FALSE;
    }

    timer_set(resize_timer, resize_delay,
              (WTimerHandler*)tmr_end_resize, (Obj*)mode);

    return TRUE;
}


static void reset_resize_timer()
{
    if(resize_timer!=NULL){
        timer_reset(resize_timer);
        destroy_obj((Obj*)resize_timer);
        resize_timer=NULL;
    }
}


/*}}}*/


/*{{{ Misc. */


static int limit_and_encode_mode(int *left, int *right,
                                 int *top, int *bottom)
{
    *left=sign(*left);
    *right=sign(*right);
    *top=sign(*top);
    *bottom=sign(*bottom);

    return (*left)+(*right)*3+(*top)*9+(*bottom)*27;
}


static void resize_units(WMoveresMode *mode, int *wret, int *hret)
{
    WSizeHints *h=&(mode->hints);
    *wret=1;
    *hret=1;
    if(h->inc_set && (h->width_inc>1 || h->height_inc>1)){
        *wret=h->width_inc;
        *hret=h->height_inc;
    }
}


/*}}}*/


/*{{{ Keyboard resize interface */


/*EXTL_DOC
 * Shrink or grow resize mode target one step in each direction.
 * Acceptable values for the parameters \var{left}, \var{right}, \var{top}
 * and \var{bottom} are as follows: -1: shrink along,
 * 0: do not change, 1: grow along corresponding border.
 */
EXTL_EXPORT_MEMBER
void moveresmode_resize(WMoveresMode *mode,
                        int left, int right, int top, int bottom)
{
    int wu=0, hu=0;
    int accel_mode=0;

    if(!setup_resize_timer(mode))
        return;

    accel_mode=3*limit_and_encode_mode(&left, &right, &top, &bottom);
    resize_units(mode, &wu, &hu);
    moveresmode_accel(mode, &wu, &hu, accel_mode);

    moveresmode_delta_resize(mode, -left*wu, right*wu, -top*hu, bottom*hu,
                             NULL);
}


/*EXTL_DOC
 * Move resize mode target one step:
 *
 * \begin{tabular}{rl}
 * \hline
 * \var{horizmul}/\var{vertmul} & effect \\\hline
 * -1 & Move left/up \\
 * 0 & No effect \\
 * 1 & Move right/down \\
 * \end{tabular}
 */
EXTL_EXPORT_MEMBER
void moveresmode_move(WMoveresMode *mode, int horizmul, int vertmul)
{
    int accel_mode=0, dummy=0;

    if(!setup_resize_timer(mode))
        return;

    accel_mode=1+3*limit_and_encode_mode(&horizmul, &vertmul, &dummy, &dummy);
    moveresmode_accel(mode, &horizmul, &vertmul, accel_mode);

    moveresmode_delta_resize(mode, horizmul, horizmul, vertmul, vertmul,
                             NULL);
}


/*EXTL_DOC
 * Request exact geometry in move/resize mode. For details on parameters,
 * see \fnref{WRegion.rqgeom}.
 */
EXTL_EXPORT_AS(WMoveresMode, rqgeom)
ExtlTab moveresmode_rqgeom_extl(WMoveresMode *mode, ExtlTab g)
{
    WRQGeomParams rq=RQGEOMPARAMS_INIT;
    WRectangle res;

    rqgeomparams_from_table(&rq, &mode->geom, g);

    moveresmode_rqgeom(mode, &rq, &res);

    return extl_table_from_rectangle(&res);
}

/*EXTL_DOC
 * Returns current geometry.
 */
EXTL_EXPORT_MEMBER
ExtlTab moveresmode_geom(WMoveresMode *mode)
{
    return extl_table_from_rectangle(&mode->geom);
}


/*EXTL_DOC
 * Return from move/resize mode and apply changes unless opaque
 * move/resize is enabled.
 */
EXTL_EXPORT_MEMBER
void moveresmode_finish(WMoveresMode *mode)
{
    WRegion *reg=moveresmode_target(mode);
    if(moveresmode_do_end(mode, TRUE)){
        reset_resize_timer();
        region_warp(reg);
        ioncore_grab_remove(resize_handler);
    }
}


/*EXTL_DOC
 * Return from move/resize cancelling changes if opaque
 * move/resize has not been enabled.
 */
EXTL_EXPORT_MEMBER
void moveresmode_cancel(WMoveresMode *mode)
{
    WRegion *reg=moveresmode_target(mode);
    if(moveresmode_do_end(mode, FALSE)){
        reset_resize_timer();
        region_warp(reg);
        ioncore_grab_remove(resize_handler);
    }
}


static void cancel_moveres(WRegion *reg)
{
    WMoveresMode *mode=moveres_mode(reg);
    if(mode!=NULL)
        moveresmode_cancel(mode);
}


/*EXTL_DOC
 * Enter move/resize mode for \var{reg}. The bindings set with
 * \fnref{ioncore.set_bindings} for \type{WMoveresMode} are used in
 * this mode. Of the functions exported by the Ion C core, only
 * \fnref{WMoveresMode.resize}, \fnref{WMoveresMode.move},
 * \fnref{WMoveresMode.cancel} and \fnref{WMoveresMode.end} are
 * allowed to be called while in this mode.
 */
EXTL_EXPORT_MEMBER
WMoveresMode *region_begin_kbresize(WRegion *reg)
{
    WMoveresMode *mode=region_begin_resize(reg, NULL, FALSE);

    if(mode==NULL)
        return NULL;

    if(!setup_resize_timer(mode))
        return NULL;

    accel_reset();

    ioncore_grab_establish(reg, resize_handler,
                           (GrabKilledHandler*)cancel_moveres,
                           0, GRAB_DEFAULT_FLAGS);

    return mode;
}


/*}}}*/