/*
 * 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 __UI_RECEIVER_H__
#define __UI_RECEIVER_H__

#include "ui.hpp"
#include "ui_navigation.hpp"
#include "ui_painter.hpp"
#include "ui_widget.hpp"

#include "rf_path.hpp"

#include <cstddef>
#include <cstdint>
#include <algorithm>
#include <functional>

namespace ui {

// TODO: build in support for editing.
class FrequencyField : public Widget {
   public:
    std::function<void(rf::Frequency)> on_change{};
    std::function<void(void)> on_edit{};
    std::function<void(void)> on_show_options{};

    using range_t = rf::FrequencyRange;

    FrequencyField(const Point parent_pos);

    rf::Frequency value() const;

    void set_value(rf::Frequency new_value);
    void set_step(rf::Frequency new_value);

    void paint(Painter& painter) override;

    bool on_key(const ui::KeyEvent event) override;
    bool on_encoder(const EncoderEvent delta) override;
    bool on_touch(const TouchEvent event) override;
    void on_focus() override;

   private:
    const size_t length_;
    const range_t range;
    rf::Frequency value_{0};
    rf::Frequency step{25000};
    uint64_t last_ms_{0};

    rf::Frequency clamp_value(rf::Frequency value);
};

template <size_t N>
class FieldString {
   public:
    enum Justify {
        Right,
        Left,
    };

    constexpr FieldString(
        Justify justify)
        : justify{justify} {
    }

    uint32_t as_int() const {
        uint32_t value = 0;
        for (const auto c : s) {
            const uint_fast8_t digit = (c == ' ') ? 0 : c - '0';
            value = (value * 10) + digit;
        }
        return value;
    }

    void set(uint32_t value) {
        std::generate(s.rbegin(), s.rend(), [&value]() {
            const char digit = (value % 10) + '0';
            value /= 10;
            return digit;
        });
    }

    void clear() {
        s.fill(' ');
    }

    void add_digit(const char c) {
        insert_right(c);
    }

    void delete_digit() {
        if (justify == Justify::Right) {
            shift_right();
            s.front() = ' ';
        } else {
            auto first_digit = std::find_if(s.rbegin(), s.rend(), [](const char& a) {
                return a != ' ';
            });
            if (first_digit != s.rend()) {
                *first_digit = ' ';
            }
        }
    }

    std::string as_string() const {
        return {s.data(), s.size()};
    }

    void remove_leading_zeros() {
        remove_zeros(s.begin(), s.end());
    }

    void remove_trailing_zeros() {
        remove_zeros(s.rbegin(), s.rend());
    }

   private:
    using array_type = std::array<char, N>;

    array_type s{};
    Justify justify{Justify::Left};

    template <typename Iterator>
    void remove_zeros(Iterator begin, Iterator end) {
        const auto first_significant_digit =
            std::find_if(begin, end, [](const char& a) {
                return a != '0';
            });
        std::fill(begin, first_significant_digit, ' ');
    }

    void insert_right(const char c) {
        auto insert_point = s.end() - 1;

        if (justify == Justify::Left) {
            insert_point = std::find_if(s.begin(), s.end(), [](const char& a) {
                return a == ' ';
            });
        }

        if (*insert_point != ' ') {
            insert_point = shift_left();
        }

        *insert_point = c;
    }

    typename array_type::iterator shift_left() {
        return std::move(s.begin() + 1, s.end(), s.begin());
    }

    typename array_type::iterator shift_right() {
        return std::move_backward(s.begin(), s.end() - 1, s.end());
    }
};

class FrequencyKeypadView : public View {
   public:
    std::function<void(rf::Frequency)> on_changed{};

    FrequencyKeypadView(
        NavigationView& nav,
        const rf::Frequency value);

    void focus() override;

    rf::Frequency value() const;
    void set_value(const rf::Frequency new_value);
    bool on_encoder(const EncoderEvent delta) override;

   private:
    int16_t focused_button = 0;
    static constexpr int button_w = 240 / 3;
    static constexpr int button_h = 48;

    static constexpr int mhz_digits = 4;
    static constexpr int submhz_digits = 4;

    static constexpr int mhz_mod = pow(10, mhz_digits);
    static constexpr int submhz_base = pow(10, 6 - submhz_digits);
    static constexpr int text_digits = mhz_digits + 1 + submhz_digits;

    Text text_value{
        {0, 4, 240, 16}};

    std::array<Button, 12> buttons{};

    Button button_save{
        {0, button_h * 5, 60, button_h},
        "Save"};
    Button button_load{
        {60, button_h * 5, 60, button_h},
        "Load"};
    Button button_close{
        {128, button_h * 5, 112, button_h},
        "Done"};

    /* TODO: Template arg required in enum?! */
    FieldString<mhz_digits> mhz{FieldString<4>::Justify::Right};
    FieldString<submhz_digits> submhz{FieldString<4>::Justify::Left};

    enum State {
        DigitMHz,
        DigitSubMHz
    };

    State state{DigitMHz};
    bool clear_field_if_digits_entered{true};

    void on_button(Button& button);

    void digit_add(const char c);
    void digit_delete();

    void field_toggle();
    void update_text();
};

class FrequencyStepView : public OptionsField {
   public:
    FrequencyStepView(
        Point parent_pos)
        : OptionsField{
              parent_pos,
              5,
              {
                  {" Auto", 0},  /* Faster == larger step. */
                  {"   10", 10}, /* Fine tuning SSB voice pitch,in HF and QO-100 sat #669 */
                  {"   50", 50}, /* added 50Hz/10Hz,but we do not increase GUI digit decimal */
                  {"  100", 100},
                  {"  1k ", 1000},
                  {"  3k ", 3000}, /* Approximate SSB bandwidth */
                  {"  5k ", 5000},
                  {"  6k3", 6250},
                  {"  9k ", 9000}, /* channel spacing for LF, MF in some regions */
                  {" 10k ", 10000},
                  {" 12k5", 12500},
                  {" 25k ", 25000},
                  {"100k ", 100000},
                  {"  1M ", 1000000},
                  {" 10M ", 10000000},
              }} {
    }
};

class FrequencyOptionsView : public View {
   public:
    std::function<void(rf::Frequency)> on_change_step{};
    std::function<void(int32_t)> on_change_reference_ppm_correction{};

    FrequencyOptionsView(const Rect parent_rect, const Style* const style);

    void set_step(rf::Frequency f);
    void set_reference_ppm_correction(int32_t v);

   private:
    Text text_step{
        {0 * 8, 0 * 16, 4 * 8, 1 * 16},
        "Step"};

    FrequencyStepView field_step{
        {5 * 8, 0 * 16},
    };

    void on_step_changed(rf::Frequency v);
    void on_reference_ppm_correction_changed(int32_t v);

    NumberField field_ppm{
        {23 * 8, 0 * 16},
        3,
        {-99, 99},
        1,
        '0',
    };
    Text text_ext{
        {23 * 8, 0 * 16, 3 * 8, 1 * 16},
        "EXT",
    };
    Text text_ppm{
        {27 * 8, 0 * 16, 3 * 8, 16},
        "PPM",
    };
};

class RFAmpField : public NumberField {
   public:
    RFAmpField(Point parent_pos);
};

class RadioGainOptionsView : public View {
   public:
    RadioGainOptionsView(const Rect parent_rect, const Style* const style);

   private:
    Text label_rf_amp{
        {0 * 8, 0 * 16, 3 * 8, 1 * 16},
        "Amp"};

    RFAmpField field_rf_amp{
        {4 * 8, 0 * 16},
    };
};

class LNAGainField : public NumberField {
   public:
    std::function<void(void)> on_show_options{};

    LNAGainField(Point parent_pos);

    void on_focus() override;
};

class VGAGainField : public NumberField {
   public:
    std::function<void(void)> on_show_options{};

    VGAGainField(Point parent_pos);

    void on_focus() override;
};

class AudioVolumeField : public NumberField {
   public:
    AudioVolumeField(Point parent_pos);
};

} /* namespace ui */

#endif /*__UI_RECEIVER_H__*/