/*
 * Copyright (C) 2019  Max Regan
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#pragma once

#include "Task.h"
#include "SpiDriver.h"
#include "font.h"

namespace BSP {

class DisplayDriver  : public Common::Schedule::Task {
public:
    DisplayDriver(Common::Schedule::TaskScheduler &scheduler, SpiDriver &spi);

    static constexpr uint8_t DISPLAY_WIDTH = 144;
    static constexpr uint8_t DISPLAY_HEIGHT = 168;


    /**
     * Common::Schedule::Task
     */
    Common::ReturnCode init();
    Common::Schedule::NextTime execute() override;

    /**
     * DisplayDriver
     */
    void set_bit(unsigned int x, unsigned int y, uint8_t val);
    void set_byte(unsigned int x, unsigned int y, uint8_t val);
    void char_at(int *x_off, int y_off, char c, const struct font *font);
    void string_at(int x_off, int y_off, const char *string, const struct font *font);
    void refresh();
    void clear();

private:
    void buffer_init();
    void set_dirty(unsigned int y);
    const struct glyph *glyph_for_char(const struct font *font, char c);

    struct display_line
    {
        uint8_t mode;
        uint8_t line;
        uint8_t data[DISPLAY_WIDTH / 8];
    };

    struct display_buffer
    {
        struct display_line lines[DISPLAY_HEIGHT];
        uint16_t dummy;
    };


    Common::Schedule::TaskScheduler &m_scheduler;
    SpiDriver &m_spi;

    struct display_buffer m_buffer;

    bool m_is_dirty;
    uint8_t m_dirty_line_min;
    uint8_t m_dirty_line_max;

};

}