/* This entire file is licensed under MIT
 *
 * Copyright 2020 Sophie Winter
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "mock-server.h"
#include "linux/input.h"

typedef enum
{
    SURFACE_ROLE_NONE = 0,
    SURFACE_ROLE_XDG_TOPLEVEL,
    SURFACE_ROLE_XDG_POPUP,
    SURFACE_ROLE_LAYER,
} SurfaceRole;

typedef struct
{
    SurfaceRole role;
    struct wl_resource* surface;
    struct wl_resource* pending_frame;
    struct wl_resource* xdg_toplevel;
    struct wl_resource* xdg_popup;
    struct wl_resource* xdg_surface;
    struct wl_resource* layer_surface;
    char has_pending_buffer; // If the pending buffer is non-null; same as has_committed_buffer if no pending buffer
    char has_committed_buffer; // This surface has a non-null committed buffer
    char initial_commit_for_role; // Set to 1 when a role is created for a surface, and cleared after the first commit
    char layer_send_configure; // If to send a layer surface configure on the next commit
    int layer_set_w; // The width to configure the layer surface with
    int layer_set_h; // The height to configure the layer surface with
    uint32_t layer_anchor; // The layer surface's anchor
} SurfaceData;

static struct wl_resource* seat_global = NULL;
static struct wl_resource* pointer_global = NULL;
static struct wl_resource* output_global = NULL;
static uint32_t click_serial = 0;

// Needs to be called before any role objects are assigned
static void surface_data_set_role(SurfaceData* data, SurfaceRole role)
{
    ASSERT_EQ(data->role, SURFACE_ROLE_NONE, "%u");
    char is_xdg_role = (role == SURFACE_ROLE_XDG_TOPLEVEL || role == SURFACE_ROLE_XDG_POPUP);
    ASSERT_EQ(data->xdg_surface != NULL, is_xdg_role, "%d");
    ASSERT(!data->xdg_toplevel);
    ASSERT(!data->xdg_popup);
    ASSERT(!data->layer_surface);
    ASSERT(!data->has_committed_buffer);
    data->role = role;
    data->initial_commit_for_role = 1;
}

static void wl_surface_frame(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    NEW_ID_ARG(callback, 0);
    SurfaceData* data = wl_resource_get_user_data(resource);
    ASSERT(!data->pending_frame);
    data->pending_frame = wl_resource_create(
        wl_resource_get_client(resource),
        &wl_callback_interface,
        wl_resource_get_version(resource),
        callback);
}

static void wl_surface_attach(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    RESOURCE_ARG(wl_buffer, buffer, 0);
    SurfaceData* data = wl_resource_get_user_data(resource);
    data->has_pending_buffer = (buffer != NULL);
}

static void wl_surface_commit(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    SurfaceData* data = wl_resource_get_user_data(resource);
    data->has_committed_buffer = data->has_pending_buffer;
    // leave the contents of has_pending_buffer alone
    if (data->pending_frame)
    {
        wl_callback_send_done(data->pending_frame, 0);
        wl_resource_destroy(data->pending_frame);
        data->pending_frame = NULL;
    }
    if (data->initial_commit_for_role)
    {
        ASSERT(!data->has_committed_buffer);
        data->initial_commit_for_role = 0;
    }
    if (data->layer_surface && data->layer_send_configure)
    {
        char horiz = (
            (data->layer_anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT) &&
            (data->layer_anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT));
        char vert = (
            (data->layer_anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP) &&
            (data->layer_anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM));
        int width = data->layer_set_w;
        int height = data->layer_set_h;
        if (width == 0 && !horiz)
            FATAL("not horizontally stretched and no width given");
        if (height == 0 && !vert)
            FATAL("not horizontally stretched and no width given");
        if (horiz)
            width = DEFAULT_OUTPUT_WIDTH;
        if (vert)
            height = DEFAULT_OUTPUT_HEIGHT;
        zwlr_layer_surface_v1_send_configure(data->layer_surface, wl_display_next_serial(display), width, height);
        data->layer_send_configure = 0;

        // Move the pointer onto the surface and click
        // This is needed to trigger a tooltip or popup menu to open for the popup tests
        ASSERT(pointer_global);
        wl_pointer_send_enter(
            pointer_global,
            wl_display_next_serial(display),
            data->surface,
            wl_fixed_from_double(5.0), wl_fixed_from_double(5.0));
        wl_pointer_send_frame(pointer_global);
        click_serial = wl_display_next_serial(display);
        wl_pointer_send_button(
            pointer_global,
            click_serial, 0,
            BTN_LEFT, WL_POINTER_BUTTON_STATE_PRESSED);
        wl_pointer_send_frame(pointer_global);
    }
}

static void wl_surface_destroy(struct wl_resource* resource, const struct wl_message* message, union wl_argument* args)
{
    SurfaceData* data = wl_resource_get_user_data(resource);
    ASSERT(!data->xdg_popup);
    ASSERT(!data->xdg_toplevel);
    ASSERT(!data->xdg_surface);
    ASSERT(!data->layer_surface);
    free(data);
}

static void wl_compositor_create_surface(struct wl_resource* resource, const struct wl_message* message, union wl_argument* args)
{
    NEW_ID_ARG(id, 0);
    struct wl_resource* surface = wl_resource_create(
        wl_resource_get_client(resource),
        &wl_surface_interface,
        wl_resource_get_version(resource),
        id);
    SurfaceData* data = ALLOC_STRUCT(SurfaceData);
    data->surface = surface;
    use_default_impl(surface);
    wl_resource_set_user_data(surface, data);
}

void wl_seat_bind(struct wl_client* client, void* data, uint32_t version, uint32_t id)
{
    ASSERT(!seat_global);
    seat_global = wl_resource_create(client, &wl_seat_interface, version, id);
    use_default_impl(seat_global);
    wl_seat_send_capabilities(seat_global, WL_SEAT_CAPABILITY_POINTER | WL_SEAT_CAPABILITY_KEYBOARD);
};

void wl_output_bind(struct wl_client* client, void* data, uint32_t version, uint32_t id)
{
    ASSERT(!output_global);
    output_global = wl_resource_create(client, &wl_output_interface, version, id);
    use_default_impl(output_global);
    wl_output_send_done(output_global);
};

static void wl_seat_get_pointer(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    NEW_ID_ARG(id, 0);
    ASSERT(!pointer_global);
    pointer_global = wl_resource_create(
        wl_resource_get_client(resource),
        &wl_pointer_interface,
        wl_resource_get_version(resource),
        id);
    use_default_impl(pointer_global);
}

static void xdg_wm_base_get_xdg_surface(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    NEW_ID_ARG(id, 0);
    RESOURCE_ARG(wl_surface, surface, 1);
    struct wl_resource* xdg_surface = wl_resource_create(
        wl_resource_get_client(resource),
        &xdg_surface_interface,
        wl_resource_get_version(resource),
        id);
    use_default_impl(xdg_surface);
    SurfaceData* data = wl_resource_get_user_data(surface);
    wl_resource_set_user_data(xdg_surface, data);
    data->xdg_surface = xdg_surface;
}

static void xdg_surface_destroy(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    SurfaceData* data = wl_resource_get_user_data(resource);
    ASSERT(!data->xdg_toplevel);
    ASSERT(!data->xdg_popup);
    data->xdg_surface = NULL;
}

static void xdg_surface_get_toplevel(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    NEW_ID_ARG(id, 0);
    struct wl_resource* toplevel = wl_resource_create(
        wl_resource_get_client(resource),
        &xdg_toplevel_interface,
        wl_resource_get_version(resource),
        id);
    use_default_impl(toplevel);
    struct wl_array states;
    wl_array_init(&states);
    xdg_toplevel_send_configure(toplevel, 0, 0, &states);
    wl_array_release(&states);
    xdg_surface_send_configure(resource, wl_display_next_serial(display));
    SurfaceData* data = wl_resource_get_user_data(resource);
    surface_data_set_role(data, SURFACE_ROLE_XDG_TOPLEVEL);
    wl_resource_set_user_data(toplevel, data);
    data->xdg_toplevel = toplevel;
}

static void xdg_toplevel_destroy(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    SurfaceData* data = wl_resource_get_user_data(resource);
    ASSERT(data->xdg_surface);
    data->xdg_toplevel = NULL;
}

static void xdg_surface_get_popup(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    NEW_ID_ARG(id, 0);
    struct wl_resource* popup = wl_resource_create(
        wl_resource_get_client(resource),
        &xdg_popup_interface,
        wl_resource_get_version(resource),
        id);
    use_default_impl(popup);
    xdg_popup_send_configure(popup, 0, 0, 100, 100);
    xdg_surface_send_configure(resource, wl_display_next_serial(display));
    SurfaceData* data = wl_resource_get_user_data(resource);
    surface_data_set_role(data, SURFACE_ROLE_XDG_POPUP);
    wl_resource_set_user_data(popup, data);
    data->xdg_popup = popup;
}

static void xdg_popup_grab(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    RESOURCE_ARG(wl_seat, seat, 0);
    UINT_ARG(serial, 1);
    ASSERT_EQ(seat, seat_global, "%p");
    ASSERT_EQ(serial, click_serial, "%u");
}

static void xdg_popup_destroy(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    SurfaceData* data = wl_resource_get_user_data(resource);
    ASSERT(data->xdg_surface);
    data->xdg_popup = NULL;
}

static void zwlr_layer_surface_v1_set_anchor(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    UINT_ARG(anchor, 0);
    SurfaceData* data = wl_resource_get_user_data(resource);
    data->layer_send_configure = 1;
    data->layer_anchor = anchor;
}

static void zwlr_layer_surface_v1_set_size(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    UINT_ARG(width, 0);
    UINT_ARG(height, 1);
    SurfaceData* data = wl_resource_get_user_data(resource);
    data->layer_send_configure = 1;
    data->layer_set_w = width;
    data->layer_set_h = height;
}

static void zwlr_layer_shell_v1_get_layer_surface(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    NEW_ID_ARG(id, 0);
    RESOURCE_ARG(wl_surface, surface, 1);
    struct wl_resource* layer_surface = wl_resource_create(
        wl_resource_get_client(resource),
        &zwlr_layer_surface_v1_interface,
        wl_resource_get_version(resource),
        id);
    use_default_impl(layer_surface);
    SurfaceData* data = wl_resource_get_user_data(surface);
    surface_data_set_role(data, SURFACE_ROLE_LAYER);
    wl_resource_set_user_data(layer_surface, data);
    data->layer_send_configure = 1;
    data->layer_surface = layer_surface;
}

static void zwlr_layer_surface_v1_destroy(struct wl_resource *resource, const struct wl_message* message, union wl_argument* args)
{
    SurfaceData* data = wl_resource_get_user_data(resource);
    data->layer_surface = NULL;
}

void init()
{
    OVERRIDE_REQUEST(wl_surface, commit);
    OVERRIDE_REQUEST(wl_surface, frame);
    OVERRIDE_REQUEST(wl_surface, attach);
    OVERRIDE_REQUEST(wl_surface, destroy);
    OVERRIDE_REQUEST(wl_compositor, create_surface);
    OVERRIDE_REQUEST(wl_seat, get_pointer);
    OVERRIDE_REQUEST(xdg_wm_base, get_xdg_surface);
    OVERRIDE_REQUEST(xdg_surface, destroy);
    OVERRIDE_REQUEST(xdg_surface, get_toplevel);
    OVERRIDE_REQUEST(xdg_toplevel, destroy);
    OVERRIDE_REQUEST(xdg_surface, get_popup);
    OVERRIDE_REQUEST(xdg_popup, grab);
    OVERRIDE_REQUEST(xdg_popup, destroy);
    OVERRIDE_REQUEST(zwlr_layer_shell_v1, get_layer_surface);
    OVERRIDE_REQUEST(zwlr_layer_surface_v1, set_anchor);
    OVERRIDE_REQUEST(zwlr_layer_surface_v1, set_size);
    OVERRIDE_REQUEST(zwlr_layer_surface_v1, destroy);

    wl_global_create(display, &wl_seat_interface, 6, NULL, wl_seat_bind);
    wl_global_create(display, &wl_output_interface, 2, NULL, wl_output_bind);
    default_global_create(display, &wl_shm_interface, 1);
    default_global_create(display, &wl_data_device_manager_interface, 2);
    default_global_create(display, &wl_compositor_interface, 4);
    default_global_create(display, &wl_subcompositor_interface, 1);
    default_global_create(display, &xdg_wm_base_interface, 2);
    default_global_create(display, &zwlr_layer_shell_v1_interface, 4);
}