/*
 * Copyright (c) 2021-2022, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "FindDialog.h"
#include <AK/Array.h>
#include <AK/DeprecatedString.h>
#include <AK/Hex.h>
#include <AK/StringView.h>
#include <Applications/HexEditor/FindDialogGML.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Button.h>
#include <LibGUI/MessageBox.h>
#include <LibGUI/RadioButton.h>
#include <LibGUI/TextBox.h>
#include <LibGUI/Widget.h>

struct Option {
    StringView title;
    OptionId opt;
    bool enabled;
    bool default_action;
};

static constexpr Array<Option, 2> options = {
    {
        { "ASCII String"sv, OPTION_ASCII_STRING, true, true },
        { "Hex value"sv, OPTION_HEX_VALUE, true, false },
    }
};

GUI::Dialog::ExecResult FindDialog::show(GUI::Window* parent_window, DeprecatedString& out_text, ByteBuffer& out_buffer, bool& find_all)
{
    auto dialog = FindDialog::construct();

    if (parent_window)
        dialog->set_icon(parent_window->icon());

    if (!out_text.is_empty() && !out_text.is_null())
        dialog->m_text_editor->set_text(out_text);

    dialog->m_find_button->set_enabled(!dialog->m_text_editor->text().is_empty());
    dialog->m_find_all_button->set_enabled(!dialog->m_text_editor->text().is_empty());

    auto result = dialog->exec();

    if (result != ExecResult::OK)
        return result;

    auto selected_option = dialog->selected_option();
    auto processed = dialog->process_input(dialog->text_value(), selected_option);

    out_text = dialog->text_value();

    if (processed.is_error()) {
        GUI::MessageBox::show_error(parent_window, processed.error());
        result = ExecResult::Aborted;
    } else {
        out_buffer = move(processed.value());
    }

    find_all = dialog->find_all();

    dbgln("Find: value={} option={} find_all={}", out_text.characters(), (int)selected_option, find_all);
    return result;
}

Result<ByteBuffer, DeprecatedString> FindDialog::process_input(DeprecatedString text_value, OptionId opt)
{
    dbgln("process_input opt={}", (int)opt);
    switch (opt) {
    case OPTION_ASCII_STRING: {
        if (text_value.is_empty())
            return DeprecatedString("Input is empty");

        return text_value.to_byte_buffer();
    }

    case OPTION_HEX_VALUE: {
        auto decoded = decode_hex(text_value.replace(" "sv, ""sv, ReplaceMode::All));
        if (decoded.is_error())
            return DeprecatedString::formatted("Input is invalid: {}", decoded.error().string_literal());

        return decoded.value();
    }

    default:
        VERIFY_NOT_REACHED();
    }
}

FindDialog::FindDialog()
    : Dialog(nullptr)
{
    resize(280, 146);
    center_on_screen();
    set_resizable(false);
    set_title("Find");

    auto& main_widget = set_main_widget<GUI::Widget>();
    if (!main_widget.load_from_gml(find_dialog_gml))
        VERIFY_NOT_REACHED();

    m_text_editor = *main_widget.find_descendant_of_type_named<GUI::TextBox>("text_editor");
    m_find_button = *main_widget.find_descendant_of_type_named<GUI::Button>("find_button");
    m_find_all_button = *main_widget.find_descendant_of_type_named<GUI::Button>("find_all_button");
    m_cancel_button = *main_widget.find_descendant_of_type_named<GUI::Button>("cancel_button");

    auto& radio_container = *main_widget.find_descendant_of_type_named<GUI::Widget>("radio_container");
    for (size_t i = 0; i < options.size(); i++) {
        auto action = options[i];
        auto& radio = radio_container.add<GUI::RadioButton>();
        radio.set_enabled(action.enabled);
        radio.set_text(action.title);

        radio.on_checked = [this, i](auto) {
            m_selected_option = options[i].opt;
        };

        if (action.default_action) {
            radio.set_checked(true);
            m_selected_option = options[i].opt;
        }
    }

    m_text_editor->on_change = [this]() {
        m_find_button->set_enabled(!m_text_editor->text().is_empty());
        m_find_all_button->set_enabled(!m_text_editor->text().is_empty());
    };

    m_find_button->on_click = [this](auto) {
        auto text = m_text_editor->text();
        if (!text.is_empty()) {
            m_text_value = text;
            done(ExecResult::OK);
        }
    };
    m_find_button->set_default(true);

    m_find_all_button->on_click = [this](auto) {
        m_find_all = true;
        m_find_button->click();
    };

    m_cancel_button->on_click = [this](auto) {
        done(ExecResult::Cancel);
    };
}
