/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "KnobsWidget.h"
#include "AudioEngine.h"
#include "MainWidget.h"
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Label.h>
#include <LibGUI/Slider.h>

KnobsWidget::KnobsWidget(AudioEngine& audio_engine, MainWidget& main_widget)
    : m_audio_engine(audio_engine)
    , m_main_widget(main_widget)
{
    set_layout<GUI::VerticalBoxLayout>();
    set_fill_with_background_color(true);

    m_labels_container = add<GUI::Widget>();
    m_labels_container->set_layout<GUI::HorizontalBoxLayout>();
    m_labels_container->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
    m_labels_container->set_preferred_size(0, 20);

    m_octave_label = m_labels_container->add<GUI::Label>("Octave");
    m_wave_label = m_labels_container->add<GUI::Label>("Wave");
    m_attack_label = m_labels_container->add<GUI::Label>("Attack");
    m_decay_label = m_labels_container->add<GUI::Label>("Decay");
    m_sustain_label = m_labels_container->add<GUI::Label>("Sustain");
    m_release_label = m_labels_container->add<GUI::Label>("Release");
    m_delay_label = m_labels_container->add<GUI::Label>("Delay");

    m_values_container = add<GUI::Widget>();
    m_values_container->set_layout<GUI::HorizontalBoxLayout>();
    m_values_container->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
    m_values_container->set_preferred_size(0, 10);

    m_octave_value = m_values_container->add<GUI::Label>(String::number(m_audio_engine.octave()));
    m_wave_value = m_values_container->add<GUI::Label>(wave_strings[m_audio_engine.wave()]);
    m_attack_value = m_values_container->add<GUI::Label>(String::number(m_audio_engine.attack()));
    m_decay_value = m_values_container->add<GUI::Label>(String::number(m_audio_engine.decay()));
    m_sustain_value = m_values_container->add<GUI::Label>(String::number(m_audio_engine.sustain()));
    m_release_value = m_values_container->add<GUI::Label>(String::number(m_audio_engine.release()));
    m_delay_value = m_values_container->add<GUI::Label>(String::number(m_audio_engine.delay()));

    m_knobs_container = add<GUI::Widget>();
    m_knobs_container->set_layout<GUI::HorizontalBoxLayout>();

    // FIXME: Implement vertical flipping in GUI::Slider, not here.

    m_octave_knob = m_knobs_container->add<GUI::VerticalSlider>();
    m_octave_knob->set_tooltip("Z: octave down, X: octave up");
    m_octave_knob->set_range(octave_min - 1, octave_max - 1);
    m_octave_knob->set_value((octave_max - 1) - (m_audio_engine.octave() - 1));
    m_octave_knob->on_value_changed = [this](int value) {
        int new_octave = octave_max - value;
        if (m_change_octave)
            m_main_widget.set_octave_and_ensure_note_change(new_octave == m_audio_engine.octave() + 1 ? Up : Down);
        ASSERT(new_octave == m_audio_engine.octave());
        m_octave_value->set_text(String::number(new_octave));
    };

    m_wave_knob = m_knobs_container->add<GUI::VerticalSlider>();
    m_wave_knob->set_tooltip("C: cycle through waveforms");
    m_wave_knob->set_range(0, last_wave);
    m_wave_knob->set_value(last_wave - m_audio_engine.wave());
    m_wave_knob->on_value_changed = [this](int value) {
        int new_wave = last_wave - value;
        m_audio_engine.set_wave(new_wave);
        ASSERT(new_wave == m_audio_engine.wave());
        m_wave_value->set_text(wave_strings[new_wave]);
    };

    constexpr int max_attack = 1000;
    m_attack_knob = m_knobs_container->add<GUI::VerticalSlider>();
    m_attack_knob->set_range(0, max_attack);
    m_attack_knob->set_value(max_attack - m_audio_engine.attack());
    m_attack_knob->set_step(100);
    m_attack_knob->on_value_changed = [this](int value) {
        int new_attack = max_attack - value;
        m_audio_engine.set_attack(new_attack);
        ASSERT(new_attack == m_audio_engine.attack());
        m_attack_value->set_text(String::number(new_attack));
    };

    constexpr int max_decay = 1000;
    m_decay_knob = m_knobs_container->add<GUI::VerticalSlider>();
    m_decay_knob->set_range(0, max_decay);
    m_decay_knob->set_value(max_decay - m_audio_engine.decay());
    m_decay_knob->set_step(100);
    m_decay_knob->on_value_changed = [this](int value) {
        int new_decay = max_decay - value;
        m_audio_engine.set_decay(new_decay);
        ASSERT(new_decay == m_audio_engine.decay());
        m_decay_value->set_text(String::number(new_decay));
    };

    constexpr int max_sustain = 1000;
    m_sustain_knob = m_knobs_container->add<GUI::VerticalSlider>();
    m_sustain_knob->set_range(0, max_sustain);
    m_sustain_knob->set_value(max_sustain - m_audio_engine.sustain());
    m_sustain_knob->set_step(100);
    m_sustain_knob->on_value_changed = [this](int value) {
        int new_sustain = max_sustain - value;
        m_audio_engine.set_sustain(new_sustain);
        ASSERT(new_sustain == m_audio_engine.sustain());
        m_sustain_value->set_text(String::number(new_sustain));
    };

    constexpr int max_release = 1000;
    m_release_knob = m_knobs_container->add<GUI::VerticalSlider>();
    m_release_knob->set_range(0, max_release);
    m_release_knob->set_value(max_release - m_audio_engine.release());
    m_release_knob->set_step(100);
    m_release_knob->on_value_changed = [this](int value) {
        int new_release = max_release - value;
        m_audio_engine.set_release(new_release);
        ASSERT(new_release == m_audio_engine.release());
        m_release_value->set_text(String::number(new_release));
    };

    constexpr int max_delay = 8;
    m_delay_knob = m_knobs_container->add<GUI::VerticalSlider>();
    m_delay_knob->set_range(0, max_delay);
    m_delay_knob->set_value(max_delay - m_audio_engine.delay());
    m_delay_knob->on_value_changed = [this](int value) {
        int new_delay = max_delay - value;
        m_audio_engine.set_delay(new_delay);
        ASSERT(new_delay == m_audio_engine.delay());
        m_delay_value->set_text(String::number(new_delay));
    };
}

KnobsWidget::~KnobsWidget()
{
}

void KnobsWidget::update_knobs()
{
    m_wave_knob->set_value(last_wave - m_audio_engine.wave());

    // FIXME: This is needed because when the slider is changed directly, it
    // needs to change the octave, but if the octave was changed elsewhere, we
    // need to change the slider without changing the octave.
    m_change_octave = false;
    m_octave_knob->set_value(octave_max - m_audio_engine.octave());
    m_change_octave = true;
}