game_display.cpp

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/*
    Copyright (C) 2003 - 2024
    by David White <dave@whitevine.net>
    Part of the Battle for Wesnoth Project https://www.wesnoth.org/
 
    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.
 
    See the COPYING file for more details.
*/
 
/**
 * @file
 * During a game, show map & info-panels at top+right.
 */
 
#include "game_display.hpp"
 
 
#include "cursor.hpp"
#include "display_chat_manager.hpp"
#include "fake_unit_manager.hpp"
#include "floating_label.hpp"
#include "game_board.hpp"
#include "preferences/preferences.hpp"
#include "log.hpp"
#include "map/map.hpp"
#include "font/standard_colors.hpp"
#include "reports.hpp"
#include "resources.hpp"
#include "tod_manager.hpp"
#include "color.hpp"
#include "synced_context.hpp"
#include "units/unit.hpp"
#include "units/drawer.hpp"
#include "utils/general.hpp"
#include "whiteboard/manager.hpp"
#include "overlay.hpp"
#include "draw.hpp"
 
static lg::log_domain log_display("display");
#define ERR_DP LOG_STREAM(err, log_display)
#define LOG_DP LOG_STREAM(info, log_display)
#define DBG_DP LOG_STREAM(debug, log_display)
 
static lg::log_domain log_engine("engine");
#define ERR_NG LOG_STREAM(err, log_engine)
 
/**
 * Function to return 2 half-hex footsteps images for the given location.
 * Only loc is on the current route set by set_route.
 *
 * This function is only used internally by game_display so I have moved it out of the header into the compilaton unit.
 */
std::vector<texture> footsteps_images(const map_location& loc, const pathfind::marked_route & route_, const display_context * dc_);
 
game_display::game_display(game_board& board,
        std::weak_ptr<wb::manager> wb,
        reports& reports_object,
        const std::string& theme_id,
        const config& level)
    : display(&board, wb, reports_object, theme_id, level)
    , overlay_map_()
    , attack_indicator_src_()
    , attack_indicator_dst_()
    , route_()
    , displayedUnitHex_()
    , first_turn_(true)
    , in_game_(false)
    , chat_man_(new display_chat_manager(*this))
    , mode_(RUNNING)
    , needs_rebuild_(false)
{
}
 
game_display::~game_display()
{
    try {
        chat_man_->prune_chat_messages(true);
    } catch(...) {
        DBG_DP << "Caught exception in game_display destructor: " << utils::get_unknown_exception_type();
    }
}
 
void game_display::new_turn()
{
    if(!first_turn_) {
        const time_of_day& tod = resources::tod_manager->get_time_of_day();
        const time_of_day& old_tod = resources::tod_manager->get_previous_time_of_day();
 
        if(old_tod.image_mask != tod.image_mask) {
            fade_tod_mask(old_tod.image_mask, tod.image_mask);
        }
    }
 
    first_turn_ = false;
 
    update_tod();
}
 
void game_display::select_hex(map_location hex)
{
    if(hex.valid() && fogged(hex)) {
        return;
    }
    display::select_hex(hex);
 
    display_unit_hex(hex);
}
 
void game_display::highlight_hex(map_location hex)
{
    wb::future_map_if future(!synced_context::is_synced()); /**< Lasts for whole method. */
 
    const unit *u = context().get_visible_unit(hex, viewing_team(), !dont_show_all_);
    if (u) {
        displayedUnitHex_ = hex;
        invalidate_unit();
    } else {
        u = context().get_visible_unit(mouseoverHex_, viewing_team(), !dont_show_all_);
        if (u) {
            // mouse moved from unit hex to non-unit hex
            if (context().units().count(selectedHex_)) {
                displayedUnitHex_ = selectedHex_;
                invalidate_unit();
            }
        }
    }
 
    display::highlight_hex(hex);
    invalidate_game_status();
}
 
 
void game_display::display_unit_hex(map_location hex)
{
    if (!hex.valid())
        return;
 
    wb::future_map_if future(!synced_context::is_synced()); /**< Lasts for whole method. */
 
    const unit *u = context().get_visible_unit(hex, viewing_team(), !dont_show_all_);
    if (u) {
        displayedUnitHex_ = hex;
        invalidate_unit();
    }
}
 
void game_display::invalidate_unit_after_move(const map_location& src, const map_location& dst)
{
    if (src == displayedUnitHex_) {
        displayedUnitHex_ = dst;
        invalidate_unit();
    }
}
 
void game_display::scroll_to_leader(int side, SCROLL_TYPE scroll_type,bool force)
{
    unit_map::const_iterator leader = context().units().find_leader(side);
 
    if(leader.valid() && leader->is_visible_to_team(viewing_team(), false)) {
        scroll_to_tile(leader->get_location(), scroll_type, true, force);
    }
}
 
void game_display::update()
{
    display::update();
 
    if (std::shared_ptr<wb::manager> w = wb_.lock()) {
        w->pre_draw();
    }
    process_reachmap_changes();
    /**
     * @todo FIXME: must modify changed, but best to do it at the
     * floating_label level
     */
    chat_man_->prune_chat_messages();
}
 
 
void game_display::render()
{
    display::render();
 
    if (std::shared_ptr<wb::manager> w = wb_.lock()) {
        w->post_draw();
    }
}
 
void game_display::draw_invalidated()
{
    display::draw_invalidated();
    if (fake_unit_man_->empty()) {
        return;
    }
    unit_drawer drawer = unit_drawer(*this);
 
    for(const unit* temp_unit : *fake_unit_man_) {
        const map_location& loc = temp_unit->get_location();
        if(utils::contains(invalidated_, loc) && unit_can_draw_here(loc, *temp_unit)) {
            drawer.redraw_unit(*temp_unit);
        }
    }
}
 
namespace
{
const std::string mouseover_normal_top = "misc/hover-hex-top.png~RC(magenta>gold)";
const std::string mouseover_normal_bot = "misc/hover-hex-bottom.png~RC(magenta>gold)";
 
const std::string mouseover_enemy_top = "misc/hover-hex-enemy-top.png~RC(magenta>red)";
const std::string mouseover_enemy_bot = "misc/hover-hex-enemy-bottom.png~RC(magenta>red)";
 
const std::string mouseover_self_top = "misc/hover-hex-top.png~RC(magenta>green)";
const std::string mouseover_self_bot = "misc/hover-hex-bottom.png~RC(magenta>green)";
 
const std::string mouseover_ally_top = "misc/hover-hex-top.png~RC(magenta>lightblue)";
const std::string mouseover_ally_bot = "misc/hover-hex-bottom.png~RC(magenta>lightblue)";
}
 
void game_display::draw_hex(const map_location& loc)
{
    const bool on_map = context().map().on_board(loc);
    const bool is_shrouded = shrouded(loc);
 
    display::draw_hex(loc);
 
    if(cursor::get() == cursor::WAIT) {
        // Interaction is disabled, so we don't need anything else
        return;
    }
 
    if(on_map && loc == mouseoverHex_ && !map_screenshot_) {
        drawing_layer hex_top_layer = drawing_layer::mouseover_bottom;
        const unit* u = context().get_visible_unit(loc, viewing_team());
        if(u != nullptr) {
            hex_top_layer = drawing_layer::mouseover_top;
        }
 
        const std::string* mo_top_path;
        const std::string* mo_bot_path;
 
        if(u == nullptr) {
            mo_top_path = &mouseover_normal_top;
            mo_bot_path = &mouseover_normal_bot;
        } else if(viewing_team().is_enemy(u->side())) {
            mo_top_path = &mouseover_enemy_top;
            mo_bot_path = &mouseover_enemy_bot;
        } else if(viewing_team().side() == u->side()) {
            mo_top_path = &mouseover_self_top;
            mo_bot_path = &mouseover_self_bot;
        } else {
            mo_top_path = &mouseover_ally_top;
            mo_bot_path = &mouseover_ally_bot;
        }
 
        drawing_buffer_add(hex_top_layer, loc,
            [tex = image::get_texture(*mo_top_path, image::HEXED)](const rect& dest) { draw::blit(tex, dest); });
 
        drawing_buffer_add(drawing_layer::mouseover_bottom, loc,
            [tex = image::get_texture(*mo_bot_path, image::HEXED)](const rect& dest) { draw::blit(tex, dest); });
    }
 
    // Draw reach_map information.
    // We remove the reachability mask of the unit that we want to attack.
    if(!is_shrouded && !reach_map_.empty() && reach_map_.find(loc) != reach_map_.end() && loc != attack_indicator_dst_) {
        drawing_buffer_add(drawing_layer::fog_shroud, loc, [images = get_reachmap_images(loc)](const rect& dest) {
            for(const texture& t : images) {
                draw::blit(t, dest);
            }
        });
    }
 
    if(std::shared_ptr<wb::manager> w = wb_.lock()) {
        w->draw_hex(loc);
 
        if(!(w->is_active() && w->has_temp_move())) {
            std::vector<texture> footstepImages = footsteps_images(loc, route_, dc_);
            if(!footstepImages.empty()) {
                drawing_buffer_add(drawing_layer::footsteps, loc, [images = std::move(footstepImages)](const rect& dest) {
                    for(const texture& t : images) {
                        draw::blit(t, dest);
                    }
                });
            }
        }
    }
 
    // Draw the attack direction indicator
    if(on_map && loc == attack_indicator_src_) {
        drawing_buffer_add(drawing_layer::attack_indicator, loc,
            [tex = image::get_texture("misc/attack-indicator-src-" + attack_indicator_direction() + ".png", image::HEXED)](const rect& dest)
            { draw::blit(tex, dest); }
        );
    } else if(on_map && loc == attack_indicator_dst_) {
        drawing_buffer_add(drawing_layer::attack_indicator, loc,
            [tex = image::get_texture("misc/attack-indicator-dst-" + attack_indicator_direction() + ".png", image::HEXED)](const rect& dest)
            { draw::blit(tex, dest); }
        );
    }
 
    // Linger overlay unconditionally otherwise it might give glitches
    // so it's drawn over the shroud and fog.
    if(mode_ != RUNNING) {
        static const image::locator linger(game_config::images::linger);
        drawing_buffer_add(drawing_layer::linger_overlay, loc,
            [tex = image::get_texture(linger, image::TOD_COLORED)](const rect& dest) { draw::blit(tex, dest); });
    }
 
    if(on_map && loc == selectedHex_ && !game_config::images::selected.empty()) {
        static const image::locator selected(game_config::images::selected);
        drawing_buffer_add(drawing_layer::selected_hex, loc,
            [tex = image::get_texture(selected, image::HEXED)](const rect& dest) { draw::blit(tex, dest); });
    }
 
    // Show def% and turn to reach info
    if(!is_shrouded && on_map) {
        draw_movement_info(loc);
    }
}
 
const time_of_day& game_display::get_time_of_day(const map_location& loc) const
{
    return resources::tod_manager->get_time_of_day(loc);
}
 
bool game_display::has_time_area() const
{
    return resources::tod_manager->has_time_area();
}
 
void game_display::layout()
{
    display::layout();
 
    refresh_report("report_clock");
    refresh_report("report_battery");
    refresh_report("report_countdown");
 
    if (invalidateGameStatus_)
    {
        wb::future_map future; // start planned unit map scope
 
        // We display the unit the mouse is over if it is over a unit,
        // otherwise we display the unit that is selected.
        for (const std::string &name : reports_object_->report_list()) {
            refresh_report(name);
        }
        invalidateGameStatus_ = false;
    }
}
 
 
void game_display::set_game_mode(const game_mode mode)
{
    if(mode != mode_) {
        mode_ = mode;
        invalidate_all();
    }
}
 
void game_display::draw_movement_info(const map_location& loc)
{
    // Search if there is a mark here
    pathfind::marked_route::mark_map::iterator w = route_.marks.find(loc);
 
    std::shared_ptr<wb::manager> wb = wb_.lock();
 
    // Don't use empty route or the first step (the unit will be there)
    if(w != route_.marks.end()
                && !route_.steps.empty() && route_.steps.front() != loc) {
        const unit_map::const_iterator un =
                (wb && wb->get_temp_move_unit().valid()) ?
                        wb->get_temp_move_unit() : context().units().find(route_.steps.front());
        if(un != context().units().end()) {
            // Display the def% of this terrain
            int move_cost = un->movement_cost(context().map().get_terrain(loc));
            int def = (move_cost == movetype::UNREACHABLE ?
                        0 : 100 - un->defense_modifier(context().map().get_terrain(loc)));
            std::stringstream def_text;
            def_text << def << "%";
 
            color_t color = game_config::red_to_green(def, false);
 
            // simple mark (no turn point) use smaller font
            int def_font = w->second.turns > 0 ? 18 : 16;
            draw_text_in_hex(loc, drawing_layer::move_info, def_text.str(), def_font, color);
 
            drawing_buffer_add(drawing_layer::move_info, loc,
                [inv = w->second.invisible, zoc = w->second.zoc, cap = w->second.capture](const rect& dest) {
                    if(inv) {
                        draw::blit(image::get_texture(image::locator{"misc/hidden.png"}, image::HEXED), dest);
                    }
 
                    if(zoc) {
                        draw::blit(image::get_texture(image::locator{"misc/zoc.png"}, image::HEXED), dest);
                    }
 
                    if(cap) {
                        draw::blit(image::get_texture(image::locator{"misc/capture.png"}, image::HEXED), dest);
                    }
                });
 
            //we display turn info only if different from a simple last "1"
            if (w->second.turns > 1 || (w->second.turns == 1 && loc != route_.steps.back())) {
                std::stringstream turns_text;
                turns_text << w->second.turns;
                draw_text_in_hex(loc, drawing_layer::move_info, turns_text.str(), 17, font::NORMAL_COLOR, 0.5,0.8);
            }
 
            // The hex is full now, so skip the "show enemy moves"
            return;
        }
    }
    // When out-of-turn, it's still interesting to check out the terrain defs of the selected unit
    else if (selectedHex_.valid() && loc == mouseoverHex_)
    {
        const unit_map::const_iterator selectedUnit = resources::gameboard->find_visible_unit(selectedHex_,viewing_team());
        const unit_map::const_iterator mouseoveredUnit = resources::gameboard->find_visible_unit(mouseoverHex_,viewing_team());
        if(selectedUnit != context().units().end() && mouseoveredUnit == context().units().end()) {
            // Display the def% of this terrain
            int move_cost = selectedUnit->movement_cost(context().map().get_terrain(loc));
            int def = (move_cost == movetype::UNREACHABLE ?
                        0 : 100 - selectedUnit->defense_modifier(context().map().get_terrain(loc)));
            std::stringstream def_text;
            def_text << def << "%";
 
            color_t color = game_config::red_to_green(def, false);
 
            // use small font
            int def_font = 16;
            draw_text_in_hex(loc, drawing_layer::move_info, def_text.str(), def_font, color);
        }
    }
 
    if (!reach_map_.empty()) {
        reach_map::iterator reach = reach_map_.find(loc);
        if (reach != reach_map_.end() && reach->second > 1) {
            const std::string num = std::to_string(reach->second);
            draw_text_in_hex(loc, drawing_layer::move_info, num, 16, font::YELLOW_COLOR);
        }
    }
}
 
std::vector<texture> footsteps_images(const map_location& loc, const pathfind::marked_route & route_, const display_context * dc_)
{
    std::vector<texture> res;
 
    if (route_.steps.size() < 2) {
        return res; // no real "route"
    }
 
    std::vector<map_location>::const_iterator i =
             std::find(route_.steps.begin(),route_.steps.end(),loc);
 
    if( i == route_.steps.end()) {
        return res; // not on the route
    }
 
    // Check which footsteps images of game_config we will use
    int move_cost = 1;
    const unit_map::const_iterator u = dc_->units().find(route_.steps.front());
    if(u != dc_->units().end()) {
        move_cost = u->movement_cost(dc_->map().get_terrain(loc));
    }
    int image_number = std::min<int>(move_cost, game_config::foot_speed_prefix.size());
    if (image_number < 1) {
        return res; // Invalid movement cost or no images
    }
    const std::string foot_speed_prefix = game_config::foot_speed_prefix[image_number-1];
 
    texture teleport;
 
    // We draw 2 half-hex (with possibly different directions),
    // but skip the first for the first step.
    const int first_half = (i == route_.steps.begin()) ? 1 : 0;
    // and the second for the last step
    const int second_half = (i+1 == route_.steps.end()) ? 0 : 1;
 
    for (int h = first_half; h <= second_half; ++h) {
        const std::string sense( h==0 ? "-in" : "-out" );
 
        if (!tiles_adjacent(*(i+(h-1)), *(i+h))) {
            std::string teleport_image =
            h==0 ? game_config::foot_teleport_enter : game_config::foot_teleport_exit;
            teleport = image::get_texture(teleport_image, image::HEXED);
            continue;
        }
 
        // In function of the half, use the incoming or outgoing direction
        map_location::direction dir = (i+(h-1))->get_relative_dir(*(i+h));
 
        std::string rotate;
        if (dir > map_location::direction::south_east) {
            // No image, take the opposite direction and do a 180 rotation
            dir = i->get_opposite_direction(dir);
            rotate = "~FL(horiz)~FL(vert)";
        }
 
        const std::string image = foot_speed_prefix
            + sense + "-" + i->write_direction(dir)
            + ".png" + rotate;
 
        res.push_back(image::get_texture(image, image::HEXED));
    }
 
    // we draw teleport image (if any) in last
    if (teleport != nullptr) res.push_back(teleport);
 
    return res;
}
 
 
 
void game_display::highlight_reach(const pathfind::paths &paths_list)
{
    unhighlight_reach();
    highlight_another_reach(paths_list);
}
 
void game_display::highlight_another_reach(const pathfind::paths &paths_list,
            const map_location& goal)
{
    // Fold endpoints of routes into reachability map.
    for (const pathfind::paths::step &dest : paths_list.destinations) {
        reach_map_[dest.curr]++;
    }
    reach_map_changed_ = true;
 
    if(goal != map_location::null_location() && paths_list.destinations.contains(goal)) {
        const auto& path_to_goal = paths_list.destinations.get_path(paths_list.destinations.find(goal));
        const map_location enemy_unit_location = path_to_goal[0];
        units_that_can_reach_goal_.insert(enemy_unit_location);
    }
}
 
bool game_display::unhighlight_reach()
{
    units_that_can_reach_goal_.clear();
    if(!reach_map_.empty()) {
        reach_map_.clear();
        reach_map_changed_ = true;
        return true;
    } else {
        return false;
    }
}
 
void game_display::invalidate_route()
{
    for(std::vector<map_location>::const_iterator i = route_.steps.begin();
        i != route_.steps.end(); ++i) {
        invalidate(*i);
    }
}
 
void game_display::set_route(const pathfind::marked_route *route)
{
    invalidate_route();
 
    if(route != nullptr) {
        route_ = *route;
    } else {
        route_.steps.clear();
        route_.marks.clear();
    }
 
    invalidate_route();
}
 
void game_display::float_label(const map_location& loc, const std::string& text, const color_t& color)
{
    if(prefs::get().floating_labels() == false || fogged(loc)) {
        return;
    }
 
    rect loc_rect = get_location_rect(loc);
 
    font::floating_label flabel(text);
    flabel.set_font_size(int(font::SIZE_FLOAT_LABEL * get_zoom_factor()));
    flabel.set_color(color);
    flabel.set_position(loc_rect.center().x, loc_rect.y); // middle of top edge
    flabel.set_move(0, -0.1 * turbo_speed() * get_zoom_factor());
    flabel.set_lifetime(1000/turbo_speed());
    flabel.set_scroll_mode(font::ANCHOR_LABEL_MAP);
 
    font::add_floating_label(flabel);
}
 
void game_display::set_attack_indicator(const map_location& src, const map_location& dst)
{
    if (attack_indicator_src_ != src || attack_indicator_dst_ != dst) {
        invalidate(attack_indicator_src_);
        invalidate(attack_indicator_dst_);
 
        attack_indicator_src_ = src;
        attack_indicator_dst_ = dst;
 
        invalidate(attack_indicator_src_);
        invalidate(attack_indicator_dst_);
    }
}
 
void game_display::clear_attack_indicator()
{
    set_attack_indicator(map_location::null_location(), map_location::null_location());
}
 
void game_display::begin_game()
{
    in_game_ = true;
    create_buttons();
    invalidate_all();
}
 
void game_display::needs_rebuild(bool b) {
    if (b) {
        needs_rebuild_ = true;
    }
}
 
bool game_display::maybe_rebuild() {
    if (needs_rebuild_) {
        needs_rebuild_ = false;
        recalculate_minimap();
        invalidate_all();
        rebuild_all();
        return true;
    }
    return false;
}
 
display::overlay_map& game_display::get_overlays()
{
    return overlay_map_;
}
 
std::vector<texture> game_display::get_reachmap_images(const map_location& loc) const
{
    // Use get_direction() from display.cpp namespace display_direction
    using namespace display_direction;
    std::vector<std::string> names;
    const auto adjacent = get_adjacent_tiles(loc);
 
    enum visibility { REACH = 0, CLEAR = 1 };
    std::array<visibility, 6> tiles;
 
    const std::string* image_prefix_ = &game_config::reach_map_prefix;
    DBG_DP << "Loaded image prefix: " << game_config::reach_map_prefix;
 
    for(int i = 0; i < 6; ++i) {
        if(reach_map_.find(adjacent[i]) != reach_map_.end()) {
            DBG_DP << "Adjacent " << std::to_string(i) << " to tile " << loc << " is REACHABLE";
            tiles[i] = REACH;
        } else {
            DBG_DP << "Adjacent " << std::to_string(i) << " to tile " << loc << " is NOT REACHABLE";
            tiles[i] = CLEAR;
        }
    }
 
    // Find out if location is in the inner part of reachmap (surrounded by reach)
    int s;
    for(s = 0; s != 6; ++s) {
        if(tiles[s] != REACH) {
            break;
        }
    }
 
    if(s == 6) {
        // Completely surrounded by reach. This may have a special graphic.
        DBG_DP << "Tried completely surrounding";
        std::string name = *image_prefix_ + "-all.png";
        if(image::exists(name)) {
            names.push_back(std::move(name));
        }
    }
    else {
        // else push the background image, as the rest of the graphics are meant to have it
        names.push_back(*image_prefix_ + ".png");
    }
 
    // Find all the directions overlap occurs from
    for(int i = 0, cap1 = 0; cap1 != 6; ++cap1) {
        DBG_DP << "Testing " << get_direction(i);
        if(tiles[i] != REACH) {
            DBG_DP << "Direction " << get_direction(i) << " points to an unreachable hex";
            std::ostringstream stream;
            std::string name;
            stream << *image_prefix_;
 
            for(int cap2 = 0; tiles[i] != REACH && cap2 != 6; i = (i + 1) % 6, ++cap2) {
                stream << get_direction(i);
                if(!image::exists(stream.str() + ".png")) {
                    DBG_DP << "Image does not exist: " << stream.str() + ".png on " << loc;
                    // If we don't have any surface at all,
                    // then move onto the next overlapped area
                    if(name.empty()) {
                        i = (i + 1) % 6;
                    }
                    break;
                } else {
                    name = stream.str();
                }
            }
            DBG_DP << "Tried loading image: " << stream.str() + ".png on " << loc;
 
            if(!name.empty()) {
                names.push_back(name + ".png");
            }
        } else {
            i = (i + 1) % 6;
        }
    }
 
    // now get the textures
    std::vector<texture> res;
 
    for(const std::string& name : names) {
        if(texture tex = image::get_texture(name, image::HEXED)) {
            res.push_back(std::move(tex));
        }
    }
 
    return res;
}