/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __WM8731_H__
#define __WM8731_H__

#include <cstdint>
#include <array>

#include "i2c_pp.hpp"

#include "audio.hpp"

namespace wolfson {
namespace wm8731 {

enum class ADCSource {
    Line = 0,
    Microphone = 1,
};

using address_t = uint8_t;
using reg_t = uint16_t;

constexpr size_t reg_count = 10;

enum class Register : address_t {
    LeftLineIn = 0x00,
    RightLineIn = 0x01,
    LeftHeadphoneOut = 0x02,
    RightHeadphoneOut = 0x03,
    AnalogAudioPathControl = 0x04,
    DigitalAudioPathControl = 0x05,
    PowerDownControl = 0x06,
    DigitalAudioInterfaceFormat = 0x07,
    SamplingControl = 0x08,
    ActiveControl = 0x09,
};

struct LeftLineIn {
    reg_t linvol : 5;
    reg_t reserved0 : 2;
    reg_t linmute : 1;
    reg_t lrinboth : 1;
    reg_t reserved1 : 7;
};

static_assert(sizeof(LeftLineIn) == sizeof(reg_t), "LeftLineIn type wrong size");

struct RightLineIn {
    reg_t rinvol : 5;
    reg_t reserved0 : 2;
    reg_t rinmute : 1;
    reg_t rlinboth : 1;
    reg_t reserved1 : 7;
};

static_assert(sizeof(RightLineIn) == sizeof(reg_t), "RightLineIn type wrong size");

struct LeftHeadphoneOut {
    reg_t lhpvol : 7;
    reg_t lzcen : 1;
    reg_t lrhpboth : 1;
    reg_t reserved0 : 7;
};

static_assert(sizeof(LeftHeadphoneOut) == sizeof(reg_t), "LeftHeadphoneOut type wrong size");

struct RightHeadphoneOut {
    reg_t rhpvol : 7;
    reg_t rzcen : 1;
    reg_t rlhpboth : 1;
    reg_t reserved0 : 7;
};

static_assert(sizeof(RightHeadphoneOut) == sizeof(reg_t), "RightHeadphoneOut type wrong size");

struct AnalogAudioPathControl {
    reg_t micboost : 1;
    reg_t mutemic : 1;
    reg_t insel : 1;
    reg_t bypass : 1;
    reg_t dacsel : 1;
    reg_t sidetone : 1;
    reg_t sideatt : 2;
    reg_t reserved0 : 8;
};

static_assert(sizeof(AnalogAudioPathControl) == sizeof(reg_t), "AnalogAudioPathControl type wrong size");

struct DigitalAudioPathControl {
    reg_t adchpd : 1;
    reg_t deemp : 2;
    reg_t dacmu : 1;
    reg_t hpor : 1;
    reg_t reserved0 : 11;
};

static_assert(sizeof(DigitalAudioPathControl) == sizeof(reg_t), "DigitalAudioPathControl type wrong size");

struct PowerDownControl {
    reg_t lineinpd : 1;
    reg_t micpd : 1;
    reg_t adcpd : 1;
    reg_t dacpd : 1;
    reg_t outpd : 1;
    reg_t oscpd : 1;
    reg_t clkoutpd : 1;
    reg_t poweroff : 1;
    reg_t reserved0 : 8;
};

static_assert(sizeof(PowerDownControl) == sizeof(reg_t), "PowerDownControl type wrong size");

struct DigitalAudioInterfaceFormat {
    reg_t format : 2;
    reg_t iwl : 2;
    reg_t lrp : 1;
    reg_t lrswap : 1;
    reg_t ms : 1;
    reg_t bclkinv : 1;
    reg_t reserved0 : 8;
};

static_assert(sizeof(DigitalAudioInterfaceFormat) == sizeof(reg_t), "DigitalAudioInterfaceFormat type wrong size");

struct SamplingControl {
    reg_t usb_normal : 1;
    reg_t bosr : 1;
    reg_t sr : 4;
    reg_t clkidiv2 : 1;
    reg_t clkodiv2 : 1;
    reg_t reserved0 : 8;
};

static_assert(sizeof(SamplingControl) == sizeof(reg_t), "SamplingControl type wrong size");

struct ActiveControl {
    reg_t active : 1;
    reg_t reserved0 : 15;
};

static_assert(sizeof(ActiveControl) == sizeof(reg_t), "ActiveControl type wrong size");

struct Reset {
    reg_t reset : 9;
    reg_t reserved0 : 7;
};

static_assert(sizeof(Reset) == sizeof(reg_t), "Reset type wrong size");

struct Register_Type {
    LeftLineIn left_line_in;
    RightLineIn right_line_in;
    LeftHeadphoneOut left_headphone_out;
    RightHeadphoneOut right_headphone_out;
    AnalogAudioPathControl analog_audio_path_control;
    DigitalAudioPathControl digital_audio_path_control;
    PowerDownControl power_down_control;
    DigitalAudioInterfaceFormat digital_audio_interface_format;
    SamplingControl sampling_control;
    ActiveControl active_control;
};

static_assert(sizeof(Register_Type) == reg_count * sizeof(reg_t), "Register_Type wrong size");

struct RegisterMap {
    constexpr RegisterMap(
        Register_Type values)
        : r(values) {
    }

    union {
        Register_Type r;
        std::array<reg_t, reg_count> w;
    };
};

static_assert(sizeof(RegisterMap) == reg_count * sizeof(reg_t), "RegisterMap type wrong size");

constexpr RegisterMap default_after_reset{Register_Type{
    .left_line_in = {
        .linvol = 0b10111,
        .reserved0 = 0b00,
        .linmute = 0b1,
        .lrinboth = 0b0,
        .reserved1 = 0,
    },
    .right_line_in = {
        .rinvol = 0b10111,
        .reserved0 = 0b00,
        .rinmute = 0b1,
        .rlinboth = 0b0,
        .reserved1 = 0,
    },
    .left_headphone_out = {
        .lhpvol = 0b1111001,
        .lzcen = 0b0,
        .lrhpboth = 0b0,
        .reserved0 = 0,
    },
    .right_headphone_out = {
        .rhpvol = 0b1111001,
        .rzcen = 0b0,
        .rlhpboth = 0b0,
        .reserved0 = 0,
    },
    .analog_audio_path_control = {
        .micboost = 0b0,
        .mutemic = 0b1,
        .insel = 0b0,
        .bypass = 0b1,
        .dacsel = 0b0,
        .sidetone = 0b0,
        .sideatt = 0b00,
        .reserved0 = 0,
    },
    .digital_audio_path_control = {
        .adchpd = 0b0,
        .deemp = 0b00,
        .dacmu = 0b1,
        .hpor = 0b0,
        .reserved0 = 0,
    },
    .power_down_control = {
        .lineinpd = 0b1,
        .micpd = 0b1,
        .adcpd = 0b1,
        .dacpd = 0b1,
        .outpd = 0b1,
        .oscpd = 0b0,
        .clkoutpd = 0b0,
        .poweroff = 0b1,
        .reserved0 = 0,
    },
    .digital_audio_interface_format = {
        .format = 0b10,
        .iwl = 0b10,
        .lrp = 0b0,
        .lrswap = 0b0,
        .ms = 0b0,
        .bclkinv = 0b0,
        .reserved0 = 0,
    },
    .sampling_control = {
        .usb_normal = 0b0,
        .bosr = 0b0,
        .sr = 0b0000,
        .clkidiv2 = 0b0,
        .clkodiv2 = 0b0,
        .reserved0 = 0,
    },
    .active_control = {
        .active = 0b0,
        .reserved0 = 0,
    },
}};

class WM8731 : public audio::Codec {
   public:
    constexpr WM8731(
        I2C& bus,
        const I2C::address_t bus_address)
        : bus(bus),
          bus_address(bus_address) {
    }

    void init() override;

    bool reset() override;

    std::string name() const override {
        return "WM8731";
    }

    bool detected();

    void set_line_in_volume(const volume_t volume) {
        const auto normalized = line_in_gain_range().normalize(volume);
        auto n = normalized.centibel() / 15;

        write(LeftLineIn{
            .linvol = static_cast<reg_t>(n),
            .reserved0 = 0,
            .linmute = 0,
            .lrinboth = 1,
            .reserved1 = 0,
        });
    }

    void set_wm_headphone_volume(const volume_t volume) {
        const auto normalized = headphone_gain_range().normalize(volume);
        auto n = normalized.centibel() / 10;

        write(LeftHeadphoneOut{
            .lhpvol = static_cast<reg_t>(n),
            .lzcen = 0,
            .lrhpboth = 1,
            .reserved0 = 0,
        });
    }

    void set_headphone_volume(const volume_t volume) override {
        headphone_volume = volume;
        set_wm_headphone_volume(volume);
    }

    volume_range_t headphone_gain_range() const override {
        return {-121.0_dB, 6.0_dB};
    }

    volume_range_t line_in_gain_range() const {
        return {-34.5_dB, 12.0_dB};
    }

    void headphone_mute() {
        set_wm_headphone_volume(headphone_gain_range().min);
    }

    void headphone_enable() override {
        set_wm_headphone_volume(headphone_volume);
    }

    void headphone_disable() override {
        headphone_mute();
    }

    void speaker_enable(){};
    void speaker_disable(){};
    bool speaker_disable_supported() const override {
        return false;
    }

    void microphone_enable(int8_t wm8731_boost_GUI, bool mic_to_HP_enabled) override {
        microphone_mute(true);  // c/m to reduce "plop noise" when changing wm8731_boost_GUI.
        // chThdSleepMilliseconds(20);  					// does not help to reduce the "plop noise"
        microphone_boost((wm8731_boost_GUI < 2) ? 1 : 0);  // 1 = Enable Boost (+20 dBs) .  0 = Disable Boost (0dBs).
        chThdSleepMilliseconds(120);                       // >50 msegs, very effective , >100 msegs minor improvement ,120 msegs trade off speed .
        microphone_mute(false);
        //	(void)alc_mode; 		In prev. fw version ,  when we did not use at all param., to avoid "unused warning" when compiling.)

        if (mic_to_HP_enabled)
            microphone_to_HP_enable();
        else
            microphone_to_HP_disable();
    }

    void microphone_disable() override {
        microphone_mute(true);
        microphone_to_HP_disable();
    }

    void microphone_to_HP_enable() override {
        map.r.analog_audio_path_control.sidetone = 1;    // Side Tone Switch (Analogue) 1 = Enable Side Tone
        map.r.analog_audio_path_control.sideatt = 0b00;  // Side Tone Attenuation 00 = -6dB
        write(Register::AnalogAudioPathControl);
        headphone_enable();
    }

    void microphone_to_HP_disable() override {
        map.r.analog_audio_path_control.sidetone = 0;    // Side Tone Switch (Analogue) 0 = Disable Side Tone
        map.r.analog_audio_path_control.sideatt = 0b11;  // Side Tone Attenuation 11 = -15dB
        write(Register::AnalogAudioPathControl);
    }

    void microphone_boost(const bool boost) {
        map.r.analog_audio_path_control.micboost = (boost ? 1 : 0);
        write(Register::AnalogAudioPathControl);
    }

    void microphone_mute(const bool mute) {
        map.r.analog_audio_path_control.mutemic = (mute ? 1 : 0);  // 1 = Enable Mute ,  0 = Disable Mute
        write(Register::AnalogAudioPathControl);
    }

    // void set_adc_source(const ADCSource adc_source) {
    // 	map.r.analog_audio_path_control.insel = toUType(adc_source);
    // 	write(Register::AnalogAudioPathControl);
    // }

    size_t reg_count() const override {
        return wolfson::wm8731::reg_count;
    }

    size_t reg_bits() const override {
        return 9;
    }

    uint32_t reg_read(const size_t reg_address) override;

   private:
    I2C& bus;
    const I2C::address_t bus_address;
    RegisterMap map{default_after_reset};
    volume_t headphone_volume = -60.0_dB;

    void configure_interface_i2s_slave();
    void configure_interface_i2s_master();

    bool write(const Register reg);

    bool write(const address_t reg_address, const reg_t value);

    void write(const LeftLineIn value);
    void write(const RightLineIn value);
    void write(const LeftHeadphoneOut value);
    void write(const RightHeadphoneOut value);
    void write(const AnalogAudioPathControl value);
    void write(const DigitalAudioPathControl value);
    void write(const PowerDownControl value);
    void write(const DigitalAudioInterfaceFormat value);
    void write(const SamplingControl value);
    void write(const ActiveControl value);
};

} /* namespace wm8731 */
} /* namespace wolfson */

#endif /*__WM8731_H__*/