#include "mainloop.h"
#include "focus.h"
#include "screen.h"
#include "frame.h"
#include "openbox.h"
#include "event.h"
#include "grab.h"
#include "client.h"
#include "action.h"
#include "prop.h"
#include "config.h"
#include "keytree.h"
#include "keyboard.h"
#include "translate.h"

#include <glib.h>

KeyBindingTree *keyboard_firstnode;

typedef struct {
    guint state;
    ObClient *client;
    ObAction *action;
    ObFrameContext context;
} ObInteractiveState;

static GSList *interactive_states;

static KeyBindingTree *curpos;

static void grab_for_window(Window win, gboolean grab)
{
    KeyBindingTree *p;

    ungrab_all_keys(win);

    if (grab) {
        p = curpos ? curpos->first_child : keyboard_firstnode;
        while (p) {
            grab_key(p->key, p->state, win, GrabModeAsync);
            p = p->next_sibling;
        }
        if (curpos)
            grab_key(config_keyboard_reset_keycode,
                     config_keyboard_reset_state,
                     win, GrabModeAsync);
    }
}

void keyboard_grab_for_client(ObClient *c, gboolean grab)
{
    grab_for_window(c->window, grab);
}

static void grab_keys(gboolean grab)
{
    GList *it;

    grab_for_window(screen_support_win, grab);
    for (it = client_list; it; it = g_list_next(it))
        grab_for_window(((ObClient*)it->data)->frame->window, grab);
}

static gboolean chain_timeout(gpointer data)
{
    keyboard_reset_chains();

    return FALSE; /* don't repeat */
}

void keyboard_reset_chains()
{
    ob_main_loop_timeout_remove(ob_main_loop, chain_timeout);

    if (curpos) {
        grab_keys(FALSE);
        curpos = NULL;
        grab_keys(TRUE);
    }
}

gboolean keyboard_bind(GList *keylist, ObAction *action)
{
    KeyBindingTree *tree, *t;
    gboolean conflict;
    gboolean mods = TRUE;

    g_assert(keylist != NULL);
    g_assert(action != NULL);

    if (!(tree = tree_build(keylist)))
        return FALSE;

    if ((t = tree_find(tree, &conflict)) != NULL) {
	/* already bound to something, use the existing tree */
        tree_destroy(tree);
        tree = NULL;
    } else
        t = tree;

    if (conflict) {
        g_warning("conflict with binding");
        tree_destroy(tree);
        return FALSE;
    }

    /* find if every key in this chain has modifiers, and also find the
       bottom node of the tree */
    while (t->first_child) {
        if (!t->state)
            mods = FALSE;
        t = t->first_child;
    }

    /* when there are no modifiers in the binding, then the action cannot
       be interactive */
    if (!mods && action->data.any.interactive) {
        action->data.any.interactive = FALSE;
        action->data.inter.final = TRUE;
    }

    /* set the action */
    t->actions = g_slist_append(t->actions, action);
    /* assimilate this built tree into the main tree. assimilation
       destroys/uses the tree */
    if (tree) tree_assimilate(tree);

    return TRUE;
}

void keyboard_interactive_grab(guint state, ObClient *client,
                               ObFrameContext context, ObAction *action)
{
    ObInteractiveState *s;

    if (!interactive_states) {
        if (!grab_keyboard(TRUE))
            return;
        if (!grab_pointer(TRUE, None)) {
            grab_keyboard(FALSE);
            return;
        }
    }

    s = g_new(ObInteractiveState, 1);

    s->state = state;
    s->client = client;
    s->action = action;
    s->context = context;

    interactive_states = g_slist_append(interactive_states, s);
}

gboolean keyboard_process_interactive_grab(const XEvent *e,
                                           ObClient **client,
                                           ObFrameContext *context)
{
    GSList *it, *next;
    gboolean handled = FALSE;
    gboolean done = FALSE;
    gboolean cancel = FALSE;

    for (it = interactive_states; it; it = next) {
        ObInteractiveState *s = it->data;

        next = g_slist_next(it);
        
        *client = s->client;
        *context = s->context;

        if ((e->type == KeyRelease && 
             !(s->state & e->xkey.state)))
            done = TRUE;
        else if (e->type == KeyPress) {
            if (e->xkey.keycode == ob_keycode(OB_KEY_RETURN))
                done = TRUE;
            else if (e->xkey.keycode == ob_keycode(OB_KEY_ESCAPE))
                cancel = done = TRUE;
        }
        if (done) {
            g_assert(s->action->data.any.interactive);

            s->action->data.inter.cancel = cancel;
            s->action->data.inter.final = TRUE;

            s->action->func(&s->action->data);

            grab_keyboard(FALSE);
            grab_pointer(FALSE, None);
            keyboard_reset_chains();

            g_free(s);
            interactive_states = g_slist_delete_link(interactive_states, it);
            handled = TRUE;
        }
    }

    return handled;
}

void keyboard_event(ObClient *client, const XEvent *e)
{
    KeyBindingTree *p;

    g_assert(e->type == KeyPress);

    if (e->xkey.keycode == config_keyboard_reset_keycode &&
        e->xkey.state == config_keyboard_reset_state)
    {
        keyboard_reset_chains();
        return;
    }

    if (curpos == NULL)
        p = keyboard_firstnode;
    else
        p = curpos->first_child;
    while (p) {
        if (p->key == e->xkey.keycode &&
            p->state == e->xkey.state) {
            if (p->first_child != NULL) { /* part of a chain */
                ob_main_loop_timeout_remove(ob_main_loop, chain_timeout);
                /* 5 second timeout for chains */
                ob_main_loop_timeout_add(ob_main_loop, 5 * G_USEC_PER_SEC,
                                         chain_timeout, NULL, NULL);
                grab_keys(FALSE);
                curpos = p;
                grab_keys(TRUE);
            } else {
                GSList *it;
                for (it = p->actions; it; it = it->next) {
                    ObAction *act = it->data;
                    if (act->func != NULL) {
                        act->data.any.c = client;

                        if (act->func == action_moveresize) {
                            screen_pointer_pos(&act->data.moveresize.x,
                                               &act->data.moveresize.y);
                        }

                        if (act->data.any.interactive) {
                            act->data.inter.cancel = FALSE;
                            act->data.inter.final = FALSE;
                            keyboard_interactive_grab(e->xkey.state, client,
                                                      0, act);
                        }

                        if (act->func == action_showmenu) {
                            act->data.showmenu.x = e->xkey.x_root;
                            act->data.showmenu.y = e->xkey.y_root;
                        }

                        act->data.any.c = client;
                        act->func(&act->data);
                    }
                }

                keyboard_reset_chains();
            }
            break;
        }
        p = p->next_sibling;
    }
}

void keyboard_startup(gboolean reconfig)
{
    grab_keys(TRUE);
}

void keyboard_shutdown(gboolean reconfig)
{
    GSList *it;

    tree_destroy(keyboard_firstnode);
    keyboard_firstnode = NULL;

    for (it = interactive_states; it; it = g_slist_next(it))
        g_free(it->data);
    g_slist_free(interactive_states);
    interactive_states = NULL;

    ob_main_loop_timeout_remove(ob_main_loop, chain_timeout);
    grab_keys(FALSE);
    curpos = NULL;
}