/*
 * (C)opyright MMIV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */

#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xatom.h>

#include "wm.h"

Client *
alloc_client(Window w, XWindowAttributes *wa)
{
    XTextProperty name;
    Client *c = (Client *) cext_emallocz(sizeof(Client));
    XSetWindowAttributes fwa;
    long msize;

    c->win = w;
    c->rect.x = wa->x;
    c->rect.y = wa->y;
    c->border = wa->border_width;
    c->rect.width = wa->width + 2 * c->border;
    c->rect.height = wa->height + 2 * c->border;
    XSetWindowBorderWidth(dpy, c->win, 0);
    c->proto = win_proto(c->win);
    XGetTransientForHint(dpy, c->win, &c->trans);
    if(!XGetWMNormalHints(dpy, c->win, &c->size, &msize) || !c->size.flags)
        c->size.flags = PSize;
    XAddToSaveSet(dpy, c->win);
    XGetWMName(dpy, c->win, &name);
	if(name.value) {
		cext_strlcpy(c->name, (char *)name.value, sizeof(c->name));
    	free(name.value);
	}

    fwa.override_redirect = 1;
    fwa.background_pixmap = ParentRelative;
	fwa.event_mask = SubstructureRedirectMask | ExposureMask | ButtonPressMask | PointerMotionMask;

    c->framewin = XCreateWindow(dpy, root, c->rect.x, c->rect.y,
						   c->rect.width + 2 * def.border, c->rect.height + def.border + bar_height(), 0,
						   DefaultDepth(dpy, screen), CopyFromParent,
						   DefaultVisual(dpy, screen),
						   CWOverrideRedirect | CWBackPixmap | CWEventMask, &fwa);
	c->cursor = normal_cursor;
    XDefineCursor(dpy, c->framewin, c->cursor);
    c->gc = XCreateGC(dpy, c->framewin, 0, 0);
    XSync(dpy, False);

	client = (Client **)cext_array_attach((void **)client, c, sizeof(Client *), &clientsz);
	nclient++;

    return c;
}

void
set_client_state(Client * c, int state)
{
    long data[2];

    data[0] = (long) state;
    data[1] = (long) None;
    XChangeProperty(dpy, c->win, wm_atom[WMState], wm_atom[WMState], 32,
					PropModeReplace, (unsigned char *) data, 2);
}

static void
client_name_event(Client *c)
{
	char buf[256];
	snprintf(buf, sizeof(buf), "CN %s\n", c->name);
	write_event(buf);
}

static void
client_focus_event(Client *c)
{
	char buf[256];
	snprintf(buf, sizeof(buf), "CF %d %d %d %d\n", c->frame->rect.x, c->frame->rect.y,
			 c->frame->rect.width, c->frame->rect.height);
	write_event(buf);
}

void
focus_client(Client *c)
{
	Client *old = sel_client();
	Frame *f = c->frame;
	int i = area2index(f->area);
	
	f->area->tag->sel = i;
	f->area->sel = frame2index(f);
	if(old && (old != c)) {
		grab_mouse(old->win, AnyModifier, Button1);
    	draw_client(old);
	}
	ungrab_mouse(c->win, AnyModifier, AnyButton);
    grab_mouse(c->win, Mod1Mask, Button1);
    grab_mouse(c->win, Mod1Mask, Button3);
    XRaiseWindow(dpy, c->framewin);
    XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
    draw_client(c);
	XSync(dpy, False);
	client_name_event(c);
	client_focus_event(c);
	if(i > 0 && f->area->mode == Colstack)
		arrange_area(f->area);
}

void
map_client(Client * c)
{
	XSelectInput(dpy, c->win, CLIENT_MASK & ~StructureNotifyMask);
    XMapRaised(dpy, c->win);
	XSelectInput(dpy, c->win, CLIENT_MASK);
    set_client_state(c, NormalState);
}

void
unmap_client(Client * c)
{
	ungrab_mouse(c->win, AnyModifier, AnyButton);
	XSelectInput(dpy, c->win, CLIENT_MASK & ~StructureNotifyMask);
    XUnmapWindow(dpy, c->win);
	XSelectInput(dpy, c->win, CLIENT_MASK);
    set_client_state(c, WithdrawnState);
}

void
reparent_client(Client *c, Window w, int x, int y)
{
	XSelectInput(dpy, c->win, CLIENT_MASK & ~StructureNotifyMask);
	XReparentWindow(dpy, c->win, w, x, y);
	XSelectInput(dpy, c->win, CLIENT_MASK);
}

void
configure_client(Client *c)
{
    XConfigureEvent e;
	Frame *f = c->frame;
    e.type = ConfigureNotify;
    e.event = c->win;
    e.window = c->win;
    e.x = c->rect.x;
    e.y = c->rect.y;
	if(f) {
    	e.x += f->rect.x;
    	e.y += f->rect.y;
	}
    e.width = c->rect.width;
    e.height = c->rect.height;
    e.border_width = c->border;
    e.above = None;
    e.override_redirect = False;
    XSelectInput(dpy, c->win, CLIENT_MASK & ~StructureNotifyMask);
    XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *) & e);
    XSelectInput(dpy, c->win, CLIENT_MASK);
    XSync(dpy, False);
}

static void
send_client_message(Window w, Atom a, long value)
{
    XEvent e;
    e.type = ClientMessage;
    e.xclient.window = w;
    e.xclient.message_type = a;
    e.xclient.format = 32;
    e.xclient.data.l[0] = value;
    e.xclient.data.l[1] = CurrentTime;

    XSendEvent(dpy, w, False, NoEventMask, &e);
    XSync(dpy, False);
}

void
kill_client(Client * c)
{
    if(c->proto & PROTO_DEL)
        send_client_message(c->win, wm_atom[WMProtocols], wm_atom[WMDelete]);
    else
        XKillClient(dpy, c->win);
}

void
handle_client_property(Client *c, XPropertyEvent *e)
{
    XTextProperty name;
    long msize;

    if(e->atom == wm_atom[WMProtocols]) {
        /* update */
        c->proto = win_proto(c->win);
        return;
    }
    switch (e->atom) {
    case XA_WM_NAME:
        XGetWMName(dpy, c->win, &name);
        if(name.value) {
			cext_strlcpy(c->name, (char*) name.value, sizeof(c->name));
        	free(name.value);
		}
        if(c->frame)
            draw_client(c);
		if(c == sel_client())
			client_name_event(c);
        break;
    case XA_WM_TRANSIENT_FOR:
        XGetTransientForHint(dpy, c->win, &c->trans);
        break;
    case XA_WM_NORMAL_HINTS:
        if(!XGetWMNormalHints(dpy, c->win, &c->size, &msize)
           || !c->size.flags) {
            c->size.flags = PSize;
        }
        break;
    }
}

void
destroy_client(Client * c)
{
    XFreeGC(dpy, c->gc);
    XDestroyWindow(dpy, c->framewin);
	cext_array_detach((void **)client, c, &clientsz);
	nclient--;
    free(c);
}

/* speed reasoned function for client property change */
void
draw_client(Client *c)
{
    Draw d = { 0 };

	d.align = WEST;
	d.drawable = c->framewin;
	d.font = xfont;
	d.gc = c->gc;

	if(c == sel_client())
		d.color = def.sel;
	else
		d.color = def.norm;

	/* draw border */
    if(def.border) {
        d.rect = c->frame->rect;
		d.rect.x = d.rect.y = 0;
        d.notch = &c->rect;
        blitz_drawlabel(dpy, &d);
    }
    d.rect.x = 0;
    d.rect.y = 0;
    d.rect.width = c->frame->rect.width;
    d.rect.height = bar_height();
	d.notch = nil;
    d.data = c->name;
    blitz_drawlabel(dpy, &d);
    XSync(dpy, False);
}

void
gravitate(Client *c, Bool invert)
{
    int dx = 0, dy = 0;
    int gravity = NorthWestGravity;

    if(c->size.flags & PWinGravity) {
        gravity = c->size.win_gravity;
    }
    /* y */
    switch (gravity) {
    case StaticGravity:
    case NorthWestGravity:
    case NorthGravity:
    case NorthEastGravity:
        dy = bar_height();
        break;
    case EastGravity:
    case CenterGravity:
    case WestGravity:
        dy = -(c->rect.height / 2) + bar_height();
        break;
    case SouthEastGravity:
    case SouthGravity:
    case SouthWestGravity:
        dy = -c->rect.height;
        break;
    default:
        break;
    }

    /* x */
    switch (gravity) {
    case StaticGravity:
    case NorthWestGravity:
    case WestGravity:
    case SouthWestGravity:
        dx = def.border;
        break;
    case NorthGravity:
    case CenterGravity:
    case SouthGravity:
        dx = -(c->rect.width / 2) + def.border;
        break;
    case NorthEastGravity:
    case EastGravity:
    case SouthEastGravity:
        dx = -(c->rect.width + def.border);
        break;
    default:
        break;
    }

    if(invert) {
        dx = -dx;
        dy = -dy;
    }
    c->rect.x += dx;
    c->rect.y += dy;
}

void
attach_totag(Tag *t, Client *c)
{
	Area *a = t->area[t->sel];

    reparent_client(c, c->framewin, c->rect.x, c->rect.y);
	attach_toarea(a, c);
    map_client(c);
	XMapWindow(dpy, c->framewin);
}

void
attach_client(Client *c)
{
	Tag *t;
    if(!ntag)
		t = alloc_tag();
	else
		t = tag[sel];

	attach_totag(t, c);
	focus_client(c);
}

void
detach_client(Client *c, Bool unmap)
{
	Frame *f = c->frame;
	if(f) {
		if(!c->destroyed) {
			if(!unmap)
				unmap_client(c);
			c->rect.x = f->rect.x;
			c->rect.y = f->rect.y;
			reparent_client(c, root, c->rect.x, c->rect.y);
			XUnmapWindow(dpy, c->framewin);
		}
		detach_fromarea(c);
	}
    if(c->destroyed)
        destroy_client(c);
}

Client *
sel_client_of_tag(Tag *t)
{
	if(t) {
		Area *a = t->narea ? t->area[t->sel] : nil;
		return (a && a->nframe) ? a->frame[a->sel]->client : nil;
	}
	return nil;
}

Client *
sel_client()
{
	return ntag ? sel_client_of_tag(tag[sel]) : nil;
}

Client *
win2clientframe(Window w)
{
	unsigned int i;
	for(i = 0; (i < clientsz) && client[i]; i++)
		if(client[i]->framewin == w)
			return client[i];
	return nil;
}

static void
match_sizehints(Client *c)
{
    XSizeHints *s = &c->size;

    if(s->flags & PMinSize) {
        if(c->rect.width < c->size.min_width)
            c->rect.width = c->size.min_width;
        if(c->rect.height < c->size.min_height)
            c->rect.height = c->size.min_height;
    }
    if(s->flags & PMaxSize) {
        if(c->rect.width > c->size.max_width)
            c->rect.width = c->size.max_width;
        if(c->rect.height > c->size.max_height)
            c->rect.height = c->size.max_height;
    }

    if(s->flags & PResizeInc) {
		int w = 0, h = 0;

        if(c->size.flags & PBaseSize) {
            w = c->size.base_width;
            h = c->size.base_height;
        } else if(c->size.flags & PMinSize) {
            /* base_{width,height} default to min_{width,height} */
            w = c->size.min_width;
            h = c->size.min_height;
        }
        /* client_width = base_width + i * c->size.width_inc for an integer i */
        w = c->frame->rect.width - 2 * def.border - w;
        if(s->width_inc > 0)
            c->frame->rect.width -= w % s->width_inc;

        h = c->frame->rect.height - def.border - bar_height() - h;
        if(s->height_inc > 0)
            c->frame->rect.height -= h % s->height_inc;
    }
}

void
resize_client(Client *c, XRectangle *r, XPoint *pt, Bool ignore_xcall)
{
	Frame *f = c->frame;
	int pi = tag2index(f->area->tag);
	int px = sel * rect.width;


	if(area2index(f->area) > 0)
		resize_area(c, r, pt);
	else
		f->rect = *r;

	if((f->area->mode != Colstack) || (f->area->sel == frame2index(f)))
		match_sizehints(c);

	if(!ignore_xcall)
		XMoveResizeWindow(dpy, c->framewin, px - (pi * rect.width) + f->rect.x, f->rect.y,
				f->rect.width, f->rect.height);

	if((f->area->mode != Colstack) || (f->area->sel == frame2index(f))) {
		c->rect.x = def.border;
		c->rect.y = bar_height();
		c->rect.width = f->rect.width - 2 * def.border;
		c->rect.height = f->rect.height - def.border - bar_height();
		XMoveResizeWindow(dpy, c->win, c->rect.x, c->rect.y, c->rect.width, c->rect.height);
		configure_client(c);
	}
}

int
frid2index(Area *a, unsigned short id)
{
	int i;
	for(i = 0; i < a->nframe; i++)
		if(a->frame[i]->id == id)
			return i;
	return -1;
}

int
frame2index(Frame *f)
{
	int i;
	Area *a = f->area;
	for(i = 0; i < a->nframe; i++)
		if(a->frame[i] == f)
			return i;
	return -1;
}

void
select_client(Client *c, char *arg)
{
	Frame *f = c->frame;
	Area *a = f->area;
	int i = frame2index(f);
	if(i == -1)
		return;
	if(!strncmp(arg, "prev", 5)) {
		if(!i)
			i = a->nframe - 1;
		else
			i--;
	} else if(!strncmp(arg, "next", 5)) {
		if(i + 1 < a->nframe)
			i++;
		else
			i = 0;
	}
	else {
		const char *errstr;
		i = cext_strtonum(arg, 0, a->nframe - 1, &errstr);
		if(errstr)
			return;
	}
	focus_client(a->frame[i]->client);
}

void
sendtotag_client(Client *c, char *arg)
{
	Tag *t;
	Client *to;

	if(!strncmp(arg, "new", 4))
		t = alloc_tag();
	else if(!strncmp(arg, "sel", 4))
		t = tag[sel];
	else {
		const char *errstr;
		int i = cext_strtonum(arg, 0, ntag - 1, &errstr);
		if(errstr)
			return;
		t = tag[i];
	}
	detach_client(c, False);
	attach_totag(t, c);
	if(t == tag[sel])
		focus_client(c);
	else if((to = sel_client_of_tag(tag[sel])))
		focus_client(to);
}

void
sendtoarea_client(Client *c, char *arg)
{
	const char *errstr;
	Frame *f = c->frame;
	Area *to, *a = f->area;
	Tag *t = a->tag;
	int i = area2index(a);

	if(i == -1)
		return;
	if(!strncmp(arg, "new", 4)) {
		to = alloc_area(t);
		arrange_tag(t, True);
	}
	else if(!strncmp(arg, "prev", 5)) {
		if(i == 1)
			to = t->area[t->narea - 1];
		else
			to = t->area[i - 1];
	}
	else if(!strncmp(arg, "next", 5)) {
		if(i < t->narea - 1)
			to = t->area[i + 1];
		else
			to = t->area[1];
	}
	else {
		i = cext_strtonum(arg, 0, t->narea - 1, &errstr);
		if(errstr)
			return;
		to = t->area[i];
	}
	send_toarea(to, c);
	arrange_area(a);
	arrange_area(to);
}

void
resize_all_clients()
{
	unsigned int i;
	for(i = 0; i < nclient; i++)
		if(client[i]->frame->area)
			resize_client(client[i], &client[i]->frame->rect, 0, False);
}

/* convenience function */
void
focus(Client *c)
{
	Frame *f = c->frame;
	Tag *t = f->area->tag;
	if(tag[sel] != t)
		focus_tag(t);
	focus_client(c);
}