/*
 * Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
 * Copyright (c) 2021, Spencer Dixon <spencercdixon@gmail.com>
 * Copyright (c) 2022, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/Function.h>
#include <AK/Vector.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/DirIterator.h>
#include <LibCore/Process.h>
#include <LibCore/StandardPaths.h>
#include <LibDesktop/AppFile.h>
#include <LibFileSystem/FileSystem.h>
#include <LibGUI/MessageBox.h>

namespace Desktop {

ByteString AppFile::app_file_path_for_app(StringView app_name)
{
    return ByteString::formatted("{}/{}.af", APP_FILES_DIRECTORY, app_name);
}

bool AppFile::exists_for_app(StringView app_name)
{
    return FileSystem::exists(app_file_path_for_app(app_name));
}

NonnullRefPtr<AppFile> AppFile::get_for_app(StringView app_name)
{
    return open(app_file_path_for_app(app_name));
}

NonnullRefPtr<AppFile> AppFile::open(StringView path)
{
    return adopt_ref(*new AppFile(path));
}

void AppFile::for_each(Function<void(NonnullRefPtr<AppFile>)> callback, StringView directory)
{
    Core::DirIterator di(directory, Core::DirIterator::SkipDots);
    if (di.has_error())
        return;
    while (di.has_next()) {
        auto name = di.next_path();
        if (!name.ends_with(".af"sv))
            continue;
        auto path = ByteString::formatted("{}/{}", directory, name);
        auto af = AppFile::open(path);
        if (!af->is_valid())
            continue;
        callback(af);
    }
}

AppFile::AppFile(StringView path)
    : m_config(Core::ConfigFile::open(path).release_value_but_fixme_should_propagate_errors())
    , m_valid(validate())
{
}

bool AppFile::validate() const
{
    if (m_config->read_entry("App", "Name").trim_whitespace().is_empty())
        return false;
    if (m_config->read_entry("App", "Executable").trim_whitespace().is_empty())
        return false;
    return true;
}

ByteString AppFile::name() const
{
    auto name = m_config->read_entry("App", "Name").trim_whitespace().replace("&"sv, ""sv);
    VERIFY(!name.is_empty());
    return name;
}

ByteString AppFile::menu_name() const
{
    auto name = m_config->read_entry("App", "Name").trim_whitespace();
    VERIFY(!name.is_empty());
    return name;
}

ByteString AppFile::executable() const
{
    auto executable = m_config->read_entry("App", "Executable").trim_whitespace();
    VERIFY(!executable.is_empty());
    return executable;
}

Vector<ByteString> AppFile::arguments() const
{
    auto arguments = m_config->read_entry("App", "Arguments").trim_whitespace();
    return arguments.split(' ');
}

ByteString AppFile::description() const
{
    return m_config->read_entry("App", "Description").trim_whitespace();
}

ByteString AppFile::category() const
{
    return m_config->read_entry("App", "Category").trim_whitespace();
}

ByteString AppFile::working_directory() const
{
    return m_config->read_entry("App", "WorkingDirectory").trim_whitespace();
}

ByteString AppFile::icon_path() const
{
    return m_config->read_entry("App", "IconPath").trim_whitespace();
}

GUI::Icon AppFile::icon() const
{
    auto override_icon = icon_path();
    // FIXME: support pointing to actual .ico files
    if (!override_icon.is_empty())
        return GUI::FileIconProvider::icon_for_path(override_icon);

    return GUI::FileIconProvider::icon_for_path(executable());
}

bool AppFile::run_in_terminal() const
{
    return m_config->read_bool_entry("App", "RunInTerminal", false);
}

bool AppFile::requires_root() const
{
    return m_config->read_bool_entry("App", "RequiresRoot", false);
}

bool AppFile::exclude_from_system_menu() const
{
    return m_config->read_bool_entry("App", "ExcludeFromSystemMenu", false);
}

Vector<ByteString> AppFile::launcher_mime_types() const
{
    Vector<ByteString> mime_types;
    for (auto& entry : m_config->read_entry("Launcher", "MimeTypes").split(',')) {
        entry = entry.trim_whitespace();
        if (!entry.is_empty())
            mime_types.append(entry);
    }
    return mime_types;
}

Vector<ByteString> AppFile::launcher_file_types() const
{
    Vector<ByteString> file_types;
    for (auto& entry : m_config->read_entry("Launcher", "FileTypes").split(',')) {
        entry = entry.trim_whitespace();
        if (!entry.is_empty())
            file_types.append(entry);
    }
    return file_types;
}

Vector<ByteString> AppFile::launcher_protocols() const
{
    Vector<ByteString> protocols;
    for (auto& entry : m_config->read_entry("Launcher", "Protocols").split(',')) {
        entry = entry.trim_whitespace();
        if (!entry.is_empty())
            protocols.append(entry);
    }
    return protocols;
}

ErrorOr<void> AppFile::spawn(ReadonlySpan<StringView> user_arguments) const
{
    if (!is_valid())
        return Error::from_string_literal("AppFile is invalid");

    Vector<StringView> args;

    auto arguments = AppFile::arguments();
    for (auto const& argument : arguments)
        args.append(argument);

    args.extend(Vector(user_arguments));

    TRY(Core::Process::spawn(executable(), args, working_directory()));
    return {};
}

ErrorOr<void> AppFile::spawn_with_escalation(ReadonlySpan<StringView> user_arguments) const
{
    if (!is_valid())
        return Error::from_string_literal("AppFile is invalid");

    StringView exe;
    Vector<StringView, 2> args;

    auto executable = AppFile::executable();
    auto arguments = AppFile::arguments();

    for (auto const& argument : arguments)
        args.append(argument);

    // FIXME: These single quotes won't be enough for executables with single quotes in their name.
    auto pls_with_executable = ByteString::formatted("/bin/pls '{}'", executable);
    if (run_in_terminal() && !requires_root()) {
        exe = "/bin/Terminal"sv;
        args = { "-e"sv, executable };
    } else if (!run_in_terminal() && requires_root()) {
        exe = "/bin/Escalator"sv;
        args = { executable };
    } else if (run_in_terminal() && requires_root()) {
        exe = "/bin/Terminal"sv;
        args = { "-e"sv, pls_with_executable };
    } else {
        exe = executable;
    }
    args.extend(user_arguments);

    TRY(Core::Process::spawn(exe, args.span(),
        working_directory().is_empty() ? Core::StandardPaths::home_directory() : working_directory()));
    return {};
}

void AppFile::spawn_with_escalation_or_show_error(GUI::Window& window, ReadonlySpan<StringView> arguments) const
{
    if (auto result = spawn_with_escalation(arguments); result.is_error())
        GUI::MessageBox::show_error(&window, ByteString::formatted("Failed to spawn {} with escalation: {}", executable(), result.error()));
}

}