unit_attack.cpp

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/*
    Copyright (C) 2010 - 2021
    by Mark de Wever <koraq@xs4all.nl>
    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.
*/

#define GETTEXT_DOMAIN "wesnoth-lib"

#include "gui/dialogs/unit_attack.hpp"

#include "font/text_formatting.hpp"
#include "gui/auxiliary/find_widget.hpp"
#include "gui/dialogs/attack_predictions.hpp"
#include "gui/widgets/button.hpp"
#include "gui/widgets/label.hpp"
#include "gui/widgets/image.hpp"
#include "gui/widgets/listbox.hpp"
#include "gui/widgets/settings.hpp"
#include "gui/widgets/unit_preview_pane.hpp"
#include "gui/widgets/window.hpp"
#include "game_config.hpp"
#include "game_display.hpp"
#include "gettext.hpp"
#include "help/help.hpp"
#include "language.hpp"
#include "color.hpp"
#include "units/unit.hpp"

#include <functional>

namespace gui2::dialogs
{

REGISTER_DIALOG(unit_attack)

unit_attack::unit_attack(const unit_map::iterator& attacker_itor,
                           const unit_map::iterator& defender_itor,
                           std::vector<battle_context>&& weapons,
                           const int best_weapon)
    : selected_weapon_(-1)
    , attacker_itor_(attacker_itor)
    , defender_itor_(defender_itor)
    , weapons_(std::move(weapons))
    , best_weapon_(best_weapon)
{
}

void unit_attack::damage_calc_callback()
{
    const std::size_t index = find_widget<listbox>(get_window(), "weapon_list", false).get_selected_row();
    attack_predictions::display(weapons_[index], attacker_itor_.get_shared_ptr(), defender_itor_.get_shared_ptr());
}

void unit_attack::pre_show(window& window)
{
    connect_signal_mouse_left_click(
            find_widget<button>(&window, "damage_calculation", false),
            std::bind(&unit_attack::damage_calc_callback, this));

    find_widget<unit_preview_pane>(&window, "attacker_pane", false)
        .set_displayed_unit(*attacker_itor_);

    find_widget<unit_preview_pane>(&window, "defender_pane", false)
        .set_displayed_unit(*defender_itor_);

    selected_weapon_ = -1;

    listbox& weapon_list = find_widget<listbox>(&window, "weapon_list", false);
    window.keyboard_capture(&weapon_list);

    // Possible TODO: If a "blank weapon" is generally useful, add it as a static member in attack_type.
    static const config empty;
    static const_attack_ptr no_weapon(new attack_type(empty));

    for(const auto & weapon : weapons_) {
        const battle_context_unit_stats& attacker = weapon.get_attacker_stats();
        const battle_context_unit_stats& defender = weapon.get_defender_stats();

        const attack_type& attacker_weapon =
            *attacker.weapon;
        const attack_type& defender_weapon = defender.weapon ?
            *defender.weapon : *no_weapon;

        const color_t a_cth_color = game_config::red_to_green(attacker.chance_to_hit);
        const color_t d_cth_color = game_config::red_to_green(defender.chance_to_hit);

        const std::string attw_name = !attacker_weapon.name().empty() ? attacker_weapon.name() : " ";
        const std::string defw_name = !defender_weapon.name().empty() ? defender_weapon.name() : " ";

        std::string range = attacker_weapon.range().empty() ? defender_weapon.range() : attacker_weapon.range();
        if (!range.empty()) {
            range = string_table["range_" + range];
        }

        auto a_ctx = attacker_weapon.specials_context(
            attacker_itor_.get_shared_ptr(),
            defender_itor_.get_shared_ptr(),
            attacker_itor_->get_location(),
            defender_itor_->get_location(), true, defender.weapon
        );

        auto d_ctx = defender_weapon.specials_context(
            defender_itor_.get_shared_ptr(),
            attacker_itor_.get_shared_ptr(),
            defender_itor_->get_location(),
            attacker_itor_->get_location(), false, attacker.weapon
        );

        std::string attw_specials = attacker_weapon.weapon_specials(true, attacker.backstab_pos);
        std::string defw_specials = defender_weapon.weapon_specials(true);

        if(!attw_specials.empty()) {
            attw_specials = " " + attw_specials;
        }

        if(!defw_specials.empty()) {
            defw_specials = " " + defw_specials;
        }

        std::stringstream attacker_stats, defender_stats;

        // Use attacker/defender.num_blows instead of attacker/defender_weapon.num_attacks() because the latter does not consider the swarm weapon special
        attacker_stats << "<b>" << attw_name << "</b>" << "\n"
            << attacker.damage << font::weapon_numbers_sep << attacker.num_blows
            << attw_specials << "\n"
            << font::span_color(a_cth_color) << attacker.chance_to_hit << "%</span>";

        defender_stats << "<b>" << defw_name << "</b>" << "\n"
            << defender.damage << font::weapon_numbers_sep << defender.num_blows
            << defw_specials << "\n"
            << font::span_color(d_cth_color) << defender.chance_to_hit << "%</span>";

        std::map<std::string, string_map> data;
        string_map item;

        item["use_markup"] = "true";

        item["label"] = attacker_weapon.icon();
        data.emplace("attacker_weapon_icon", item);

        item["label"] = attacker_stats.str();
        data.emplace("attacker_weapon", item);

        item["label"] = "<span color='#a69275'>" + font::unicode_em_dash + " " + range + " " + font::unicode_em_dash + "</span>";
        data.emplace("range", item);

        item["label"] = defender_stats.str();
        data.emplace("defender_weapon", item);

        item["label"] = defender_weapon.icon();
        data.emplace("defender_weapon_icon", item);

        weapon_list.add_row(data);
    }

    // If these two aren't the same size, we can't use list selection incides
    // to access to weapons list!
    assert(weapons_.size() == weapon_list.get_item_count());

    weapon_list.select_row(best_weapon_);
}

void unit_attack::post_show(window& window)
{
    if(get_retval() == retval::OK) {
        selected_weapon_ = find_widget<listbox>(&window, "weapon_list", false).get_selected_row();
    }
}

} // namespace dialogs