/*******************************************
 *     Most Awesome Renderer Ever
 *******************************************/
#include "mare.h"

namespace Render {
    
    Mare::Mare(dim_t size, ScreenRotation rot) :
    _screenSize(size),
    _screenBufferBackground(nullptr),
    _screenBufferForeground(nullptr),
    _rotation(rot)
    {
        int rv;
        _bufferDim = (_screenSize.x >> 3) * _screenSize.y;
        _screenBufferBackground = (uint8_t*)malloc(sizeof(uint8_t)* _bufferDim);
        _screenBufferForeground = (uint8_t*)malloc(sizeof(uint8_t)* _bufferDim);
        clearBuffer(_screenBufferForeground, _bufferDim, Color::White);
        clearBuffer(_screenBufferBackground, _bufferDim, Color::White);

        // init display
        DEV_Delay_ms(500); 
        if((rv=DEV_Module_Init())!=0){
            printf("Init Failed, %d\n",rv);
            return;
        }
        EPD_2IN9_V2_Init();
        EPD_2IN9_V2_Clear();
        printf("Mare render engine created\n");
    }

    Mare::~Mare(){
        for (auto &d :_drawables) {
            d.reset();
        }
        for (auto &p : _pages){
            p.reset();
        }
        free(_screenBufferBackground);
        free(_screenBufferForeground);
    }

    void Mare::render() {
        clearBuffer(_screenBufferBackground, _bufferDim, Color::White);
        for (auto d: _drawables) {
            if (d != nullptr)
                d->render();
        }
        EPD_2IN9_V2_Display_Partial(_screenBufferBackground);
    }

    void Mare::clearBuffer(uint8_t* buffer, uint16_t len, Color col){
        assert(buffer != nullptr);
        std::memset(buffer, col == Color::White ? 0xff : 0x00, len);
    }

    bool Mare::applyRotation(uint16_t* x, uint16_t* y) {
        uint16_t ax,ay;
        switch(_rotation){
            case ScreenRotation::Rot0 :
            {
                if (*x >= _screenSize.x  || *y >= _screenSize.y) return false;
                break;
            }
            case ScreenRotation::Rot90 :
            {
                if (*x >= _screenSize.y  || *y >= _screenSize.x) return false;
                ax = *x; ay = *y;
                *x = _screenSize.x - ay;
                *y = ax;
                break;
            }
            case ScreenRotation::Rot180 :
            {
                if (*x >= _screenSize.x  || *y >= _screenSize.y) return false;
                ax = *x; ay = *y;
                *x = _screenSize.x - ax;
                *y = _screenSize.y - ay;
                break;
            }
            case ScreenRotation::Rot270 :
            {
                if (*x >= _screenSize.y  || *y >= _screenSize.x) return false;
                ax = *x; ay = *y;
                *x = ay;
                *y = _screenSize.y - ax;
                break;
            }
        }
        if (*x < 0 || *y < 0) return false;
        return true;
    }


// Public
    const dim_t Mare::getCenter() {
        dim_t rv;
        if (_rotation == ScreenRotation::Rot0 || _rotation == ScreenRotation::Rot180){
            rv.x = _screenSize.x >> 1;
            rv.y = _screenSize.y >> 1;
        } else {
            rv.x = _screenSize.y >> 1;
            rv.y = _screenSize.x >> 1;
        }
        return rv;
    }

    void Mare::setPixel(uint8_t* img, uint16_t x, uint16_t y, bool value) {
        if (!applyRotation(&x,&y)) return;
        // from here the coordinates are natural for the screen
        img += (sizeof(uint8_t)*y*(_screenSize.x>>3) + sizeof(uint8_t)*(x>>3));
        if (value) *img &= ~(0x80 >> (x%8));
        else *img |= (0x80 >> (x%8)); 
    }

    void Mare::clearScreen() {
        EPD_2IN9_V2_Clear();
        clearBuffer(_screenBufferBackground, _bufferDim, Color::White);
        EPD_2IN9_V2_Display(_screenBufferBackground);
    }

}