/*
 * mouse.c - mouse managing
 *
 * Copyright © 2007-2009 Julien Danjou <julien@danjou.info>
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

/** awesome mouse API.
 *
 * The mouse buttons are represented as index. The common ones are:
 *
 * ![Client geometry](../images/mouse.svg)
 *
 * It is possible to be notified of mouse events by connecting to various
 * `client`, `widget`s and `wibox` signals:
 *
 *  * `mouse::enter`
 *  * `mouse::leave`
 *  * `mouse::press`
 *  * `mouse::release`
 *  * `mouse::move`
 *
 * It is also possible to add generic mouse button callbacks for `client`s,
 * `wiboxe`s and the `root` window. Those are set in the default `rc.lua` as such:
 *
 * **root**:
 *
 *    root.buttons(awful.util.table.join(
 *        awful.button({ }, 3, function () mymainmenu:toggle() end),
 *        awful.button({ }, 4, awful.tag.viewnext),
 *        awful.button({ }, 5, awful.tag.viewprev)
 *    ))
 *
 * **client**:
 *
 *    clientbuttons = awful.util.table.join(
 *        awful.button({ }, 1, function (c) client.focus = c; c:raise() end),
 *        awful.button({ modkey }, 1, awful.mouse.client.move),
 *        awful.button({ modkey }, 3, awful.mouse.client.resize)
 *    )
 *
 * See also `mousegrabber`
 *
 * @author Julien Danjou &lt;julien@danjou.info&gt;
 * @copyright 2008-2009 Julien Danjou
 * @release @AWESOME_VERSION@
 * @module mouse
 */

#include "mouse.h"
#include "math.h"
#include "common/util.h"
#include "common/xutil.h"
#include "common/luaclass.h"
#include "globalconf.h"
#include "objects/client.h"
#include "objects/drawin.h"
#include "objects/screen.h"

static int miss_index_handler    = LUA_REFNIL;
static int miss_newindex_handler = LUA_REFNIL;

/**
 * The `screen` under the cursor
 * @property screen
 * @param screen
 */

/** Get the pointer position.
 * \param window The window to get position on.
 * \param x will be set to the Pointer-x-coordinate relative to window
 * \param y will be set to the Pointer-y-coordinate relative to window
 * \param child Will be set to the window under the pointer.
 * \param mask will be set to the current buttons state
 * \return true on success, false if an error occurred
 **/
bool
mouse_query_pointer(xcb_window_t window, int16_t *x, int16_t *y, xcb_window_t *child, uint16_t *mask)
{
    xcb_query_pointer_cookie_t query_ptr_c;
    xcb_query_pointer_reply_t *query_ptr_r;

    query_ptr_c = xcb_query_pointer_unchecked(globalconf.connection, window);
    query_ptr_r = xcb_query_pointer_reply(globalconf.connection, query_ptr_c, NULL);

    if(!query_ptr_r || !query_ptr_r->same_screen)
    {
        p_delete(&query_ptr_r);
        return false;
    }

    *x = query_ptr_r->win_x;
    *y = query_ptr_r->win_y;

    if(mask)
        *mask = query_ptr_r->mask;
    if(child)
        *child = query_ptr_r->child;

    p_delete(&query_ptr_r);

    return true;
}

/** Get the pointer position on the screen.
 * \param x This will be set to the Pointer-x-coordinate relative to window.
 * \param y This will be set to the Pointer-y-coordinate relative to window.
 * \param child This will be set to the window under the pointer.
 * \param mask This will be set to the current buttons state.
 * \return True on success, false if an error occurred.
 */
static bool
mouse_query_pointer_root(int16_t *x, int16_t *y, xcb_window_t *child, uint16_t *mask)
{
    xcb_window_t root = globalconf.screen->root;

    return mouse_query_pointer(root, x, y, child, mask);
}

/** Set the pointer position.
 * \param window The destination window.
 * \param x X-coordinate inside window.
 * \param y Y-coordinate inside window.
 */
static inline void
mouse_warp_pointer(xcb_window_t window, int16_t x, int16_t y)
{
    xcb_warp_pointer(globalconf.connection, XCB_NONE, window,
                     0, 0, 0, 0, x, y);
}

/**
 * Allow the a Lua handler to be implemented for custom properties and
 * functions.
 * \param L A lua state
 * \param handler A function on the LUA_REGISTRYINDEX
 */
static int
luaA_mouse_call_handler(lua_State *L, int handler)
{
    int nargs = lua_gettop(L);

    /* Push error handling function and move it before args */
    lua_pushcfunction(L, luaA_dofunction_error);
    lua_insert(L, - nargs - 1);
    int error_func_pos = 1;

    /* push function and move it before args */
    lua_rawgeti(L, LUA_REGISTRYINDEX, handler);
    lua_insert(L, - nargs - 1);

    if(lua_pcall(L, nargs, LUA_MULTRET, error_func_pos))
    {
        warn("%s", lua_tostring(L, -1));
        /* Remove error function and error string */
        lua_pop(L, 2);
        return 0;
    }
    /* Remove error function */
    lua_remove(L, error_func_pos);

    return lua_gettop(L);
}

/** Mouse library.
 * \param L The Lua VM state.
 * \return The number of elements pushed on stack.
 * \luastack
 * \lfield coords Mouse coordinates.
 * \lfield screen Mouse screen.
 */
static int
luaA_mouse_index(lua_State *L)
{
    const char *attr = luaL_checkstring(L, 2);
    int16_t mouse_x, mouse_y;

    /* attr is not "screen"?! */
    if (A_STRNEQ(attr, "screen")) {
        if (miss_index_handler != LUA_REFNIL) {
            return luaA_mouse_call_handler(L, miss_index_handler);
        }
        else
            return luaA_default_index(L);
    }

    if (!mouse_query_pointer_root(&mouse_x, &mouse_y, NULL, NULL))
    {
        /* Nothing ever handles mouse.screen being nil. Lying is better than
         * having lots of lua errors in this case.
         */
        if (globalconf.focus.client)
            luaA_object_push(L, globalconf.focus.client->screen);
        else
            luaA_object_push(L, screen_get_primary());
        return 1;
    }

    luaA_object_push(L, screen_getbycoord(mouse_x, mouse_y));
    return 1;
}

/** Newindex for mouse.
 * \param L The Lua VM state.
 * \return The number of elements pushed on stack.
 */
static int
luaA_mouse_newindex(lua_State *L)
{
    const char *attr = luaL_checkstring(L, 2);
    screen_t *screen;

    if (A_STRNEQ(attr, "screen")) {
        /* Call the lua mouse property handler */
        if (miss_newindex_handler != LUA_REFNIL) {
            return luaA_mouse_call_handler(L, miss_newindex_handler);
        }
        else
            return luaA_default_newindex(L);
    }

    screen = luaA_checkscreen(L, 3);
    mouse_warp_pointer(globalconf.screen->root, screen->geometry.x, screen->geometry.y);
    return 0;
}

/** Push a table with mouse status.
 * \param L The Lua VM state.
 * \param x The x coordinate.
 * \param y The y coordinate.
 * \param mask The button mask.
 */
int
luaA_mouse_pushstatus(lua_State *L, int x, int y, uint16_t mask)
{
    lua_createtable(L, 0, 2);
    lua_pushinteger(L, x);
    lua_setfield(L, -2, "x");
    lua_pushinteger(L, y);
    lua_setfield(L, -2, "y");

    lua_createtable(L, 5, 0);

    int i = 1;

    for(uint16_t maski = XCB_BUTTON_MASK_1; maski <= XCB_BUTTON_MASK_5; maski <<= 1)
    {
        if(mask & maski)
            lua_pushboolean(L, true);
        else
            lua_pushboolean(L, false);
        lua_rawseti(L, -2, i++);
    }
    lua_setfield(L, -2, "buttons");
    return 1;
}

/* documented in lib/awful/mouse/init.lua */
static int
luaA_mouse_coords(lua_State *L)
{
    uint16_t mask;
    int x, y;
    int16_t mouse_x, mouse_y;

    if(lua_gettop(L) >= 1)
    {
        luaA_checktable(L, 1);
        bool ignore_enter_notify = (lua_gettop(L) == 2 && luaA_checkboolean(L, 2));

        if(!mouse_query_pointer_root(&mouse_x, &mouse_y, NULL, &mask))
            return 0;

        x = round(luaA_getopt_number_range(L, 1, "x", mouse_x, MIN_X11_COORDINATE, MAX_X11_COORDINATE));
        y = round(luaA_getopt_number_range(L, 1, "y", mouse_y, MIN_X11_COORDINATE, MAX_X11_COORDINATE));

        if(ignore_enter_notify)
            client_ignore_enterleave_events();

        mouse_warp_pointer(globalconf.screen->root, x, y);

        if(ignore_enter_notify)
            client_restore_enterleave_events();

        lua_pop(L, 1);
    }

    if(!mouse_query_pointer_root(&mouse_x, &mouse_y, NULL, &mask))
        return 0;

    return luaA_mouse_pushstatus(L, mouse_x, mouse_y, mask);
}

/** Get the client or any object which is under the pointer.
 *
 * @treturn client.object|nil A client or nil.
 * @function object_under_pointer
 */
static int
luaA_mouse_object_under_pointer(lua_State *L)
{
    int16_t mouse_x, mouse_y;
    xcb_window_t child;

    if(!mouse_query_pointer_root(&mouse_x, &mouse_y, &child, NULL))
        return 0;

    drawin_t *drawin;
    client_t *client;

    if((drawin = drawin_getbywin(child)))
        return luaA_object_push(L, drawin);

    if((client = client_getbyframewin(child)))
        return luaA_object_push(L, client);

    return 0;
}

/**
 * Add a custom property handler (getter).
 */
static int
luaA_mouse_set_index_miss_handler(lua_State *L)
{
    return luaA_registerfct(L, 1, &miss_index_handler);
}

/**
 * Add a custom property handler (setter).
 */
static int
luaA_mouse_set_newindex_miss_handler(lua_State *L)
{
    return luaA_registerfct(L, 1, &miss_newindex_handler);
}

const struct luaL_Reg awesome_mouse_methods[] =
{
    { "__index", luaA_mouse_index },
    { "__newindex", luaA_mouse_newindex },
    { "coords", luaA_mouse_coords },
    { "object_under_pointer", luaA_mouse_object_under_pointer },
    { "set_index_miss_handler", luaA_mouse_set_index_miss_handler},
    { "set_newindex_miss_handler", luaA_mouse_set_newindex_miss_handler},
    { NULL, NULL }
};
const struct luaL_Reg awesome_mouse_meta[] =
{
    { NULL, NULL }
};

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