/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "Editor.h"
#include "HackStudio.h"
#include "HackStudioWidget.h"
#include "Project.h"
#include <AK/StringBuilder.h>
#include <LibConfig/Client.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <LibGUI/Application.h>
#include <LibGUI/Menubar.h>
#include <LibGUI/MessageBox.h>
#include <LibGUI/Notification.h>
#include <LibGUI/Window.h>
#include <LibMain/Main.h>
#include <fcntl.h>
#include <spawn.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

using namespace HackStudio;

static WeakPtr<HackStudioWidget> s_hack_studio_widget;

static bool make_is_available();
static ErrorOr<void> notify_make_not_available();
static void update_path_environment_variable();
static Optional<DeprecatedString> last_opened_project_path();

ErrorOr<int> serenity_main(Main::Arguments arguments)
{
    TRY(Core::System::pledge("stdio recvfd sendfd tty rpath cpath wpath proc exec unix fattr thread ptrace"));

    auto app = TRY(GUI::Application::try_create(arguments));
    Config::pledge_domains({ "HackStudio", "Terminal" });

    auto window = GUI::Window::construct();
    window->resize(840, 600);
    auto icon = TRY(Gfx::Bitmap::try_load_from_file("/res/icons/16x16/app-hack-studio.png"sv));
    window->set_icon(icon);

    update_path_environment_variable();

    if (!make_is_available()) {
        TRY(notify_make_not_available());
    }

    char const* path_argument = nullptr;
    bool mode_coredump = false;
    Core::ArgsParser args_parser;
    args_parser.add_positional_argument(path_argument, "Path to a workspace or a file", "path", Core::ArgsParser::Required::No);
    args_parser.add_option(mode_coredump, "Debug a coredump in HackStudio", "coredump", 'c');
    args_parser.parse(arguments);

    auto argument_absolute_path = Core::File::real_path_for(path_argument);

    auto project_path = Core::File::real_path_for(".");
    if (!mode_coredump) {
        if (!argument_absolute_path.is_null())
            project_path = argument_absolute_path;
        else if (auto path = last_opened_project_path(); path.has_value())
            project_path = path.release_value();
    }

    auto hack_studio_widget = TRY(HackStudioWidget::create(project_path));
    window->set_main_widget(hack_studio_widget);
    s_hack_studio_widget = hack_studio_widget;

    window->set_title(DeprecatedString::formatted("{} - Hack Studio", hack_studio_widget->project().name()));

    TRY(hack_studio_widget->initialize_menubar(*window));

    window->on_close_request = [&]() -> GUI::Window::CloseRequestDecision {
        hack_studio_widget->locator().close();
        if (hack_studio_widget->warn_unsaved_changes("There are unsaved changes, do you want to save before exiting?") == HackStudioWidget::ContinueDecision::Yes)
            return GUI::Window::CloseRequestDecision::Close;
        return GUI::Window::CloseRequestDecision::StayOpen;
    };

    window->show();
    hack_studio_widget->update_actions();

    if (mode_coredump)
        hack_studio_widget->open_coredump(argument_absolute_path);

    return app->exec();
}

static bool make_is_available()
{
    pid_t pid;
    char const* argv[] = { "make", "--version", nullptr };
    posix_spawn_file_actions_t action;
    posix_spawn_file_actions_init(&action);
    posix_spawn_file_actions_addopen(&action, STDOUT_FILENO, "/dev/null", O_WRONLY, 0);

    if ((errno = posix_spawnp(&pid, "make", &action, nullptr, const_cast<char**>(argv), environ))) {
        perror("posix_spawn");
        return false;
    }
    int wstatus;
    waitpid(pid, &wstatus, 0);
    posix_spawn_file_actions_destroy(&action);
    return WEXITSTATUS(wstatus) == 0;
}

static ErrorOr<void> notify_make_not_available()
{
    auto notification = GUI::Notification::construct();
    auto icon = TRY(Gfx::Bitmap::try_load_from_file("/res/icons/32x32/app-hack-studio.png"sv));
    notification->set_icon(icon);
    notification->set_title("'make' Not Available");
    notification->set_text("You probably want to install the binutils, gcc, and make ports from the root of the Serenity repository");
    notification->show();
    return {};
}

static void update_path_environment_variable()
{
    StringBuilder path;

    auto const* path_env_ptr = getenv("PATH");
    if (path_env_ptr != NULL)
        path.append({ path_env_ptr, strlen(path_env_ptr) });

    if (path.length())
        path.append(':');
    path.append(DEFAULT_PATH_SV);
    setenv("PATH", path.to_deprecated_string().characters(), true);
}

static Optional<DeprecatedString> last_opened_project_path()
{
    auto projects = HackStudioWidget::read_recent_projects();
    if (projects.size() == 0)
        return {};

    if (!Core::File::exists(projects[0]))
        return {};

    return { projects[0] };
}

namespace HackStudio {

GUI::TextEditor& current_editor()
{
    return s_hack_studio_widget->current_editor();
}

void open_file(DeprecatedString const& filename)
{
    s_hack_studio_widget->open_file(filename);
}

void open_file(DeprecatedString const& filename, size_t line, size_t column)
{
    s_hack_studio_widget->open_file(filename, line, column);
}

RefPtr<EditorWrapper> current_editor_wrapper()
{
    if (!s_hack_studio_widget)
        return nullptr;
    return s_hack_studio_widget->current_editor_wrapper();
}

Project& project()
{
    return s_hack_studio_widget->project();
}

DeprecatedString currently_open_file()
{
    if (!s_hack_studio_widget)
        return {};
    return s_hack_studio_widget->active_file();
}

void set_current_editor_wrapper(RefPtr<EditorWrapper> wrapper)
{
    s_hack_studio_widget->set_current_editor_wrapper(wrapper);
}

void update_editor_window_title()
{
    s_hack_studio_widget->update_current_editor_title();
    s_hack_studio_widget->update_window_title();
}

Locator& locator()
{
    return s_hack_studio_widget->locator();
}

void for_each_open_file(Function<void(ProjectFile const&)> func)
{
    s_hack_studio_widget->for_each_open_file(move(func));
}

bool semantic_syntax_highlighting_is_enabled()
{
    return s_hack_studio_widget->semantic_syntax_highlighting_is_enabled();
}

}
