#define _POSIX_C_SOURCE 200112L
#include <wlr/util/log.h>
#include <assert.h>
#include "view.h"
#include "node.h"
#include "seat.h"
#include "output.h"
#include "cursor.h"

#define CONFIGURE_TIMEOUT_MS 150
static int handle_configure_timeout(void *data)
{
    struct diyac_view *view = data;
    assert(view->configuration_serial > 0);
    assert(view->configuration_timeout);

    wlr_log(WLR_INFO, "client (%s) did not respond to configure request "
                      "in %d ms",
            view->xdg_toplevel->app_id, CONFIGURE_TIMEOUT_MS);

    wl_event_source_remove(view->configuration_timeout);
    view->configuration_serial = 0;
    view->configuration_timeout = NULL;

    diyac_view_sync_geo(view);
    return 0; /* ignored per wl_event_loop docs */
}

static void diyac_view_configure(struct diyac_view *view, struct wlr_box geo)
{
    view->pending_size = geo;
    view->configuration_serial = wlr_xdg_toplevel_set_size(view->xdg_toplevel, geo.width, geo.height);
    if (!view->configuration_timeout)
    {
        view->configuration_timeout = wl_event_loop_add_timer(view->server->wl_event_loop, handle_configure_timeout, view);
    }
    wl_event_source_timer_update(view->configuration_timeout, CONFIGURE_TIMEOUT_MS);
}

static void diyac_view_set_activated(struct diyac_view *view, bool activated)
{
    struct diyac_server *server = view->server;
    wlr_xdg_toplevel_set_activated(view->xdg_toplevel, activated);
    if (view->toplevel.handle)
    {
        wlr_foreign_toplevel_handle_v1_set_activated(view->toplevel.handle, activated);
    }
    server->active_view = NULL;
    if (activated)
    {

        diyac_seat_focus_surface(&server->seat, view->xdg_toplevel->base->surface);
        server->active_view = view;
    }
}

static void raise_to_front(struct diyac_view *view)
{
    /* Move the toplevel to the front */
    wlr_scene_node_raise_to_top(&view->scene_tree->node);
    wl_list_remove(&view->link);
    wl_list_insert(&view->server->views, &view->link);
    /* Activate the new surface */
}

void diyac_focus_view(struct diyac_view *toplevel, bool raise)
{
    /* Note: this function only deals with keyboard focus. */
    if (toplevel == NULL)
    {
        return;
    }
    if (!toplevel->mapped)
    {
        // dont focus unmapped view
        return;
    }
    struct wlr_surface *prev_surface = toplevel->server->seat.wlr_seat->keyboard_state.focused_surface;
    if (prev_surface == toplevel->xdg_toplevel->base->surface)
    {
        // Don't re-focus an already focused surface.
        wlr_log(WLR_DEBUG, "Don't re-focus an already focused surface");
        return;
    }
    if (toplevel->server->active_view)
    {
        diyac_view_set_activated(toplevel->server->active_view, false);
    }
    raise_to_front(toplevel);
    if (raise)
    {
        struct diyac_view **subview = NULL;
        struct wl_array subviews;
        wl_array_init(&subviews);
        diyac_get_children_views(toplevel, &subviews);
        wl_array_for_each(subview, &subviews)
        {
            raise_to_front(*subview);
        }
        wl_array_release(&subviews);
    }
    diyac_view_set_activated(toplevel, true);
    // diyac_seat_focus_surface(&server->seat, toplevel->xdg_toplevel->base->surface);
    /*if(toplevel->toplevel.handle)
    {
        wlr_foreign_toplevel_handle_v1_set_activated(toplevel->toplevel.handle, true);
    }*/
}

struct diyac_view *diyac_view_at(
    struct diyac_server *server, double lx, double ly,
    struct wlr_surface **surface, double *sx, double *sy)
{
    struct diyac_node_descriptor *node_descriptor = diyac_node_at(server, lx, ly, surface, sx, sy);
    if (!node_descriptor || node_descriptor->type != DIYAC_NODE_VIEW)
    {
        return NULL;
    }
    return node_descriptor->data;
}

void diyac_focus_topmost_view(struct diyac_server *server, bool raise)
{
    struct diyac_view *view = diyac_topmost_focusable_view(server);
    if (view)
    {
        if (raise)
        {
            struct diyac_view *root = diyac_get_root_view(view);
            if (root)
            {
                diyac_focus_view(root, true);
                return;
            }
        }
        diyac_focus_view(view, false);
    }
    else
    {
        wlr_log(WLR_INFO, "No view found");
        /*
         * Defocus previous focused surface/view if no longer
         * focusable (e.g. unmapped or on a different workspace).
         */
        diyac_seat_focus_surface(&server->seat, NULL);
    }
}

struct diyac_view *diyac_topmost_focusable_view(struct diyac_server *server)
{
    struct wlr_surface *prev =
        server->seat.wlr_seat->keyboard_state.focused_surface;
    struct diyac_view *view;
    struct wl_list *node_list;
    struct wlr_scene_node *node;
    node_list = &server->view_tree->children;
    wl_list_for_each_reverse(node, node_list, link)
    {
        if (!node->data)
        {
            /* We found some non-view, most likely the region overlay */
            continue;
        }
        view = diyac_view_from_node(node);

        if (view->mapped /*&& view_is_focusable_from(view, prev)*/)
        {
            return view;
        }
    }
    return NULL;
}

void diyac_arrange_all_views(struct diyac_server *server)
{
    /*
     * Adjust window positions/sizes. Skip views with no size since
     * we can't do anything useful with them; they will presumably
     * be initialized with valid positions/sizes later.
     *
     * We do not simply check view->mapped/been_mapped here because
     * views can have maximized/fullscreen geometry applied while
     * still unmapped. We do want to adjust the geometry of those
     * views.
     */
    struct diyac_view *view;
    wl_list_for_each(view, &server->views, link)
    {
        diyac_view_update_geometry(view, false);
    }
}
bool diyac_view_update_geometry(struct diyac_view *view, bool grabbed)
{
    assert(view);
    // if (wlr_output_layout_intersects(view->server->output_layout,
    //                                  view->output->wlr_output, &view->current))
    //{
    if (!view->mapped)
    {
        wlr_xdg_surface_schedule_configure(view->xdg_toplevel->base);
        return false;
    }
    struct wlr_box usable = diyac_output_usable_area(view->output);
    struct diyac_server *server = view->server;
    // invalidate old state if change state
    if (view->state.fullscreen && !view->requested.fullscreen)
    {
        wlr_xdg_toplevel_set_fullscreen(view->xdg_toplevel, false);
        if (view->toplevel.handle)
        {
            wlr_foreign_toplevel_handle_v1_set_fullscreen(view->toplevel.handle, false);
        }
        wlr_scene_node_set_enabled(&view->output->scenes.top->node, true);
        view->state.fullscreen = false;
        view->pending_size = view->original;
    }
    if (view->state.maximized && !view->requested.maximized)
    {
        wlr_xdg_toplevel_set_maximized(view->xdg_toplevel, false);
        if (view->toplevel.handle)
        {
            wlr_foreign_toplevel_handle_v1_set_maximized(view->toplevel.handle, false);
        }
        view->pending_size = view->original;
        view->state.maximized = false;
    }
    bool updated = false;
    if (view->requested.minimized)
    {
        // TODO implement minimize
        return false;
    }
    else if (!view->state.fullscreen && view->requested.fullscreen)
    {
        struct wlr_box box = {0};
        wlr_output_effective_resolution(view->output->wlr_output,
                                        &box.width, &box.height);
        double ox = 0, oy = 0;
        wlr_output_layout_output_coords(view->server->output_layout,
                                        view->output->wlr_output, &ox, &oy);
        box.x -= ox;
        box.y -= oy;
        wlr_xdg_toplevel_set_fullscreen(view->xdg_toplevel, true);
        wlr_scene_node_set_enabled(&view->output->scenes.top->node, false);
        if (view->toplevel.handle)
        {
            wlr_foreign_toplevel_handle_v1_set_fullscreen(view->toplevel.handle, true);
        }
        diyac_view_configure(view, box);
        updated = true;
    }
    else if (view->requested.maximized)
    {
        wlr_xdg_toplevel_set_maximized(view->xdg_toplevel, true);
        if (view->toplevel.handle)
        {
            wlr_foreign_toplevel_handle_v1_set_maximized(view->toplevel.handle, true);
        }
        diyac_view_configure(view, usable);
        updated = true;
    }
    else
    {
        // if (wlr_output_layout_intersects(view->server->output_layout,
        //                              view->output->wlr_output, &view->current))
        //{
        /**Normal state, recalculate current geometry*/
        struct diyac_view *root = diyac_get_root_view(view);
        struct wlr_box geometry = view->pending_size;
        if (!root)
        {
            root = view;
        }
        if (!root->state.fullscreen)
        {
            
            // Only adjust position only when not in fullscreen mode

            if (!grabbed && geometry.x < usable.x)
            {
                geometry.x = usable.x;
            }
            if (!grabbed && geometry.y < usable.y)
            {
                geometry.y = usable.y;
            }
            if (grabbed && server->seat.cursor->x <= usable.x)
            {
                geometry.x = usable.x - server->grab_x;
            }
            if (grabbed && server->seat.cursor->y <= usable.y)
            {
                geometry.y = usable.y;
            }
            if (grabbed && server->seat.cursor->x >= usable.x + usable.width)
            {
                geometry.x = usable.x + usable.width - server->grab_x;
            }
            if (grabbed && server->seat.cursor->y >= usable.y + usable.height)
            {
                geometry.y = usable.y + usable.height - server->grab_y;
            }
        }
        if (!wlr_box_equal(&geometry, &view->original) || !view->requested.maximized)
        {
            wlr_log(WLR_DEBUG, "diyac_view_update_geometry: updating geometry: %d %d %d %d", geometry.x, geometry.y, geometry.width, geometry.height);
            // wlr_scene_node_set_position(&view->scene_tree->node, geometry.x, geometry.y);
            // wlr_xdg_toplevel_set_size(view->xdg_toplevel, geometry.width, geometry.height);
            diyac_view_configure(view, geometry);
            updated = true;
        }
    }
    view->state = view->requested;
    return updated;
}

void diyac_get_children_views(struct diyac_view *view, struct wl_array *children)
{
    struct diyac_view *child;
    wl_list_for_each_reverse(child, &view->server->views, link)
    {
        if (child == view)
        {
            continue;
        }
        if (!child->mapped /*&& !view->minimized*/)
        {
            continue;
        }
        if (diyac_get_root_view(child) != view)
        {
            continue;
        }
        struct diyac_view **item = wl_array_add(children, sizeof(*item));
        *item = child;
    }
}

struct diyac_view *diyac_get_root_view(struct diyac_view *view)
{
    struct wlr_xdg_toplevel *toplevel = view->xdg_toplevel;
    while (toplevel->parent)
    {
        toplevel = toplevel->parent;
    }
    return toplevel->base->data;
}

struct wlr_box diyac_view_get_geometry(struct diyac_view *view)
{
    struct wlr_box box;
    if (view->state.fullscreen)
    {
        wlr_output_layout_get_box(view->server->output_layout, view->output->wlr_output, &box);
        return box;
    }
    if (view->state.maximized)
    {
        return view->output->usable_area;
    }
    return view->original;
}

void diyac_view_set_maximize(struct diyac_view *view, bool activated)
{
    view->requested.maximized = activated;
    diyac_reset_cursor_mode(view->server);
    diyac_view_update_geometry(view, false);
}
void diyac_view_set_fullscreen(struct diyac_view *view, bool activated)
{
    view->requested.fullscreen = activated;
    /**
     * TODO: use client specific output for fullscreen
     * toplevel->xdg_toplevel->requested.fullscreen_output
     */
    diyac_reset_cursor_mode(view->server);
    diyac_view_update_geometry(view, false);
}
void diyac_view_set_mimimize(struct diyac_view *view, bool activated)
{
    // view->requested.minimized = activated;
    // TODO implement minimize
    wlr_xdg_surface_schedule_configure(view->xdg_toplevel->base);
}

void diyac_view_update_title(struct diyac_view *view)
{
    struct wlr_xdg_toplevel *xdg_toplevel = view->xdg_toplevel;
    if (!xdg_toplevel)
    {
        return;
    }
    const char *title = xdg_toplevel->title;
    wlr_log(WLR_INFO, "diyac_view_update_title: %s", title ? title : "");
    if (!view->toplevel.handle || !title)
    {
        return;
    }
    wlr_foreign_toplevel_handle_v1_set_title(view->toplevel.handle, title);
}
void diyac_view_update_app_id(struct diyac_view *view)
{
    struct wlr_xdg_toplevel *xdg_toplevel = view->xdg_toplevel;
    if (!xdg_toplevel)
    {
        return;
    }
    const char *appid = xdg_toplevel->app_id;
    wlr_log(WLR_INFO, "diyac_view_update_app_id: %s", appid ? appid : "");
    if (!view->toplevel.handle || !appid)
    {
        return;
    }
    wlr_foreign_toplevel_handle_v1_set_app_id(view->toplevel.handle, appid);
}

void diyac_view_sync_geo(struct diyac_view *view)
{
    struct wlr_box size;
    int current_x, current_y, next_x, next_y;
    wlr_scene_node_coords(&view->scene_tree->node, &current_x, &current_y);
    wlr_xdg_surface_get_geometry(view->xdg_surface, &size);

    if (!view->state.fullscreen && !view->state.maximized)
    {

        if ((view->server->resize_edges & WLR_EDGE_LEFT) || (
            (view->original.x != view->pending_size.x) &&
            (view->original.x + view->original.width == view->pending_size.x + view->pending_size.width)))
        {
            view->original.x = view->pending_size.x + view->pending_size.width - size.width;
        }
        else
        {
            view->original.x = view->pending_size.x;
        }
        if ((view->server->resize_edges & WLR_EDGE_TOP) || (
            (view->original.y != view->pending_size.y) &&
            (view->original.y + view->original.height == view->pending_size.y + view->pending_size.height)))
        {
            view->original.y = view->pending_size.y + view->pending_size.height - size.height;
        }
        else
        {
            view->original.y = view->pending_size.y;
        }

        view->original.width = size.width;
        view->original.height = size.height;
        next_x = view->original.x;
        next_y = view->original.y;
        view->pending_size = view->original;
    }
    else
    {
       
        next_x = view->pending_size.x;
        next_y = view->pending_size.y;
    }
    if(current_x != next_x || current_y != next_y)
    {
        //wlr_log(WLR_INFO, "update fullscreen position [%d,%d] VS pending [%d,%d]",
        //    current_x, current_y, next_x, next_y);
        wlr_scene_node_set_position(&view->scene_tree->node, next_x, next_y);
    }
}