/*
 * rofi
 *
 * MIT/X11 License
 * Copyright © 2013-2020 Qball Cow <qball@gmpclient.org>
 *
 * 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.
 *
 */

/** The Rofi View log domain */
#define G_LOG_DOMAIN    "View"

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <locale.h>

#include <cairo.h>

/** Indicated we understand the startup notification api is not yet stable.*/
#define SN_API_NOT_YET_FROZEN
#include <libsn/sn.h>
#include "rofi.h"

#include "timings.h"
#include "settings.h"

#include "mode.h"
#include "display.h"
#include "helper.h"
#include "helper-theme.h"
#include "xrmoptions.h"
#include "dialogs/dialogs.h"

#include "view.h"
#include "view-internal.h"

#include "theme.h"

/**
 * @param state The handle to the view
 * @param qr    Indicate if queue_redraw should be called on changes.
 *
 * Update the state of the view. This involves filter state.
 */
static void wayland_rofi_view_update ( RofiViewState *state, gboolean qr );

static void wayland_rofi_view_maybe_update ( RofiViewState *state );

/**
 * Structure holding some state
 */
static struct
{
    /** Main flags */
    MenuFlags          flags;
    /** timeout for reloading */
    guint              idle_timeout;
    /** debug counter for redraws */
    unsigned long long count;
    /** redraw idle time. */
    guint              repaint_source;
    /** Window fullscreen */
    gboolean           fullscreen;
} WlState = {
    .flags          = MENU_NORMAL,
    .idle_timeout   = 0,
    .count          = 0L,
    .repaint_source = 0,
    .fullscreen     = FALSE,
};

static void wayland_rofi_view_get_current_monitor ( int *width, int *height )
{
    display_get_surface_dimensions ( width, height );
}

/**
 * Stores a screenshot of Rofi at that point in time.
 */
static void wayland_rofi_view_capture_screenshot ( void )
{
}

static gboolean wayland_rofi_view_repaint ( G_GNUC_UNUSED void * data  )
{
    RofiViewState * state = rofi_view_get_active ();
    if ( state ) {
        // Repaint the view (if needed).
        // After a resize the edit_pixmap surface might not contain anything anymore.
        // If we already re-painted, this does nothing.
        wayland_rofi_view_maybe_update ( state );
        WlState.repaint_source = 0;
    }
    return G_SOURCE_REMOVE;
}

static const int loc_transtable[9] = {
    WL_CENTER,
    WL_NORTH | WL_WEST,
    WL_NORTH,
    WL_NORTH | WL_EAST,
    WL_EAST,
    WL_SOUTH | WL_EAST,
    WL_SOUTH,
    WL_SOUTH | WL_WEST,
    WL_WEST
};

static void wayland_rofi_view_calculate_window_position ( RofiViewState *state )
{
}

static int rofi_get_location ( RofiViewState *state )
{
    return rofi_theme_get_position ( WIDGET ( state->main_window ), "location", loc_transtable[config.location] );
}

static void wayland_rofi_view_window_update_size ( RofiViewState * state )
{
    if ( state == NULL ) {
        return;
    }
    widget_resize ( WIDGET ( state->main_window ), state->width, state->height );
    display_set_surface_dimensions ( state->width, state->height, rofi_get_location ( state ) );
}

static void wayland_rofi_view_set_size ( RofiViewState * state, gint width, gint height )
{
    if ( width > -1 ) {
        state->width = width;
    }
    if ( height > -1 ) {
        state->height = height;
    }
    wayland_rofi_view_window_update_size ( state );
}

static void wayland_rofi_view_get_size ( RofiViewState * state, gint *width, gint *height )
{
    *width  = state->width;
    *height = state->height;
}

static void wayland_rofi_view_set_cursor ( RofiCursorType type )
{
    (void) type;

    // TODO
}

static void wayland_rofi_view_ping_mouse ( RofiViewState *state )
{
    (void) state;
}

static gboolean wayland_rofi_view_reload_idle ( G_GNUC_UNUSED gpointer data )
{
    RofiViewState *state = rofi_view_get_active ();

    if ( state ) {
        state->reload   = TRUE;
        state->refilter = TRUE;

        wayland_rofi_view_maybe_update ( state );
    }
    WlState.idle_timeout = 0;
    return G_SOURCE_REMOVE;
}

static void wayland_rofi_view_reload ( void )
{
    // @TODO add check if current view is equal to the callee
    if ( WlState.idle_timeout == 0 ) {
        WlState.idle_timeout = g_timeout_add ( 1000 / 15, wayland_rofi_view_reload_idle, NULL );
    }
}
static void wayland_rofi_view_queue_redraw ( void  )
{
    RofiViewState *state = rofi_view_get_active ();
    if ( state && WlState.repaint_source == 0 ) {
        WlState.count++;
        g_debug ( "redraw %llu", WlState.count );

        widget_queue_redraw ( WIDGET ( state->main_window ) );

        WlState.repaint_source = g_idle_add_full (  G_PRIORITY_HIGH_IDLE, wayland_rofi_view_repaint, NULL, NULL );
    }
}

/**
 * Thread state for workers started for the view.
 */
typedef struct _thread_state_view
{
    /** Generic thread state. */
    thread_state  st;

    /** Condition. */
    GCond         *cond;
    /** Lock for condition. */
    GMutex        *mutex;
    /** Count that is protected by lock. */
    unsigned int  *acount;

    /** Current state. */
    RofiViewState *state;
    /** Start row for this worker. */
    unsigned int  start;
    /** Stop row for this worker. */
    unsigned int  stop;
    /** Rows processed. */
    unsigned int  count;

    /** Pattern input to filter. */
    const char    *pattern;
    /** Length of pattern. */
    glong         plen;
} thread_state_view;

static void wayland___create_window ( MenuFlags menu_flags )
{
    // FIXME: create surface
    // FIXME: roll next buffer

    TICK_N ( "create cairo surface" );
    // TODO should we update the drawable each time?
    PangoContext *p = pango_context_new (  );
    pango_context_set_font_map ( p, pango_cairo_font_map_get_default () );
    TICK_N ( "pango cairo font setup" );

    WlState.flags = menu_flags;
    // Setup font.
    // Dummy widget.
    box        *win  = box_create ( NULL, "window", ROFI_ORIENTATION_HORIZONTAL );
    const char *font = rofi_theme_get_string ( WIDGET ( win ), "font", config.menu_font );
    if ( font ) {
        PangoFontDescription *pfd = pango_font_description_from_string ( font );
        if ( helper_validate_font ( pfd, font ) ) {
            pango_context_set_font_description ( p, pfd );
        }
        pango_font_description_free ( pfd );
    }
    PangoLanguage *l = pango_language_get_default ();
    pango_context_set_language ( p, l );
    TICK_N ( "configure font" );

    // Tell textbox to use this context.
    textbox_set_pango_context ( font, p );
    // cleanup
    g_object_unref ( p );

    WlState.fullscreen = rofi_theme_get_boolean ( WIDGET ( win ), "fullscreen", FALSE );

    widget_free ( WIDGET ( win ) );

    TICK_N ( "done" );
}

/**
 * @param state Internal state of the menu.
 *
 * Calculate the width of the window and the width of an element.
 */
static void wayland_rofi_view_calculate_window_width ( RofiViewState *state )
{
    int screen_width = 1920;
    display_get_surface_dimensions ( &screen_width, NULL );

    if ( WlState.fullscreen == TRUE ) {
        state->width = screen_width;
        return;
    }

    // Calculate as float to stop silly, big rounding down errors.
    state->width = ( screen_width / 100.0f ) * DEFAULT_MENU_WIDTH;
    // Use theme configured width, if set.
    RofiDistance width = rofi_theme_get_distance ( WIDGET ( state->main_window ), "width", state->width );
    state->width = distance_get_pixel ( width, ROFI_ORIENTATION_HORIZONTAL );
}

static void wayland_rofi_view_update ( RofiViewState *state, gboolean qr )
{
    if ( !widget_need_redraw ( WIDGET ( state->main_window ) ) ) {
        return;
    }
    g_debug ( "Redraw view" );
    TICK ();
    if ( state->pool == NULL ) {
        state->pool = display_buffer_pool_new ( state->width, state->height );
    }
    cairo_surface_t *surface = display_buffer_pool_get_next_buffer ( state->pool );
    if ( surface == NULL ) {
        // no available buffer, bail out
        return;
    }
    cairo_t *d = cairo_create ( surface );
    cairo_set_operator ( d, CAIRO_OPERATOR_SOURCE );
    // Paint the background transparent.
    cairo_set_source_rgba ( d, 0, 0, 0, 0.0 );
    guint scale = display_scale ( );
    cairo_surface_set_device_scale ( surface, scale, scale );
    cairo_paint ( d );
    TICK_N ( "Background" );

    // Always paint as overlay over the background.
    cairo_set_operator ( d, CAIRO_OPERATOR_OVER );
    widget_draw ( WIDGET ( state->main_window ), d );

    TICK_N ( "widgets" );
    cairo_destroy ( d );
    display_surface_commit ( surface );

    if ( qr ) {
        wayland_rofi_view_queue_redraw ();
    }
}

/**
 * @param state The Menu Handle
 *
 * Check if a finalize function is set, and if sets executes it.
 */
void process_result ( RofiViewState *state );

static void wayland_rofi_view_maybe_update ( RofiViewState *state )
{
    if ( rofi_view_get_completed ( state ) ) {
        // This menu is done.
        rofi_view_finalize ( state );
        // If there a state. (for example error) reload it.
        state = rofi_view_get_active ();

        // cleanup, if no more state to display.
        if ( state == NULL ) {
            // Quit main-loop.
            rofi_quit_main_loop ();
            return;
        }
    }

    // Update if requested.
    if ( state->refilter ) {
        rofi_view_refilter ( state );
    }
    wayland_rofi_view_update ( state, TRUE );
}

static void wayland_rofi_view_frame_callback ( void )
{
    if ( WlState.repaint_source == 0 ) {
        WlState.repaint_source = g_idle_add_full (  G_PRIORITY_HIGH_IDLE, wayland_rofi_view_repaint, NULL, NULL );
    }
}

static int wayland_rofi_view_calculate_window_height ( RofiViewState *state )
{
    if ( WlState.fullscreen == TRUE ) {
        int height = 1080;
        display_get_surface_dimensions ( NULL, &height );
        return height;
    }

    RofiDistance h      = rofi_theme_get_distance ( WIDGET ( state->main_window ), "height", 0 );
    unsigned int height = distance_get_pixel ( h, ROFI_ORIENTATION_VERTICAL );
    // If height is set, return it.
    if ( height > 0 ) {
        return height;
    }
    // Autosize based on widgets.
    widget *main_window = WIDGET ( state->main_window );

    height = widget_get_desired_height ( main_window );
    return height;
}

static void wayland_rofi_view_hide ( void )
{
}

static void wayland_rofi_view_cleanup ()
{
    g_debug ( "Cleanup." );
    if ( WlState.idle_timeout > 0 ) {
        g_source_remove ( WlState.idle_timeout );
        WlState.idle_timeout = 0;
    }
    if ( WlState.repaint_source > 0 ) {
        g_source_remove ( WlState.repaint_source );
        WlState.repaint_source = 0;
    }
}

static void wayland_rofi_view_set_window_title ( const char * title )
{
}

static void wayland_rofi_view_pool_refresh ( void )
{
    RofiViewState *state = rofi_view_get_active ();
    if ( state == NULL ) {
        return;
    }
    display_buffer_pool_free ( state->pool );
    state->pool = NULL;
    wayland_rofi_view_update ( state, TRUE );
}

static view_proxy view_ = {
    .update                = wayland_rofi_view_update,
    .maybe_update          = wayland_rofi_view_maybe_update,
    .temp_configure_notify = NULL,
    .temp_click_to_exit    = NULL,
    .frame_callback        = wayland_rofi_view_frame_callback,
    .queue_redraw          = wayland_rofi_view_queue_redraw,

    .set_window_title          = wayland_rofi_view_set_window_title,
    .calculate_window_position = wayland_rofi_view_calculate_window_position,
    .calculate_window_height   = wayland_rofi_view_calculate_window_height,
    .calculate_window_width    = wayland_rofi_view_calculate_window_width,
    .window_update_size        = wayland_rofi_view_window_update_size,
    .set_cursor                = wayland_rofi_view_set_cursor,
    .ping_mouse                = wayland_rofi_view_ping_mouse,

    .cleanup = wayland_rofi_view_cleanup,
    .hide    = wayland_rofi_view_hide,
    .reload  = wayland_rofi_view_reload,

    .__create_window     = wayland___create_window,
    .get_window          = NULL,
    .get_current_monitor = wayland_rofi_view_get_current_monitor,
    .capture_screenshot  = wayland_rofi_view_capture_screenshot,

    .set_size = wayland_rofi_view_set_size,
    .get_size = wayland_rofi_view_get_size,

    .pool_refresh              = wayland_rofi_view_pool_refresh,
};

const view_proxy  *wayland_view_proxy = &view_;