/// @file    WasmScreenCoords.ino
/// @brief   Demonstrates screen coordinate mapping for web display
/// @example WasmScreenCoords.ino
///
/// This sketch is fully compatible with the FastLED web compiler. To use it do the following:
/// 1. Install Fastled: `pip install fastled`
/// 2. cd into this examples page.
/// 3. Run the FastLED web compiler at root: `fastled`
/// 4. When the compiler is done a web page will open.

#include <Arduino.h>
#include <FastLED.h>


#ifdef __EMSCRIPTEN__

#include "fl/vector.h"


#include "fl/json.h"
#include "fl/slice.h"
#include "fl/screenmap.h"
#include "fl/math_macros.h"

using fl::vec2f;
using fl::vector;


#define LED_PIN 3
#define BRIGHTNESS 96
#define COLOR_ORDER GRB
#define NUM_LEDS 256

CRGB leds[NUM_LEDS];
CRGB leds2[NUM_LEDS];


void make_map(int stepx, int stepy, int num, fl::vector<vec2f>* _map) {
    float x = 0;
    float y = 0;
    fl::vector<vec2f>& map = *_map;
    for (int16_t i = 0; i < num; i++) {
        map.push_back(vec2f{x, y});
        x += stepx;
        y += stepy;
    }
}

void setup() {
    for (CRGB& c : leds) {
        c = CRGB::Blue;
    }
    for (CRGB& c : leds2) {
        c = CRGB::Red;
    }
    FastLED.setBrightness(255);
    fl::vector<vec2f> map;
    make_map(1, 1, NUM_LEDS, &map);
    fl::ScreenMap screenmap = fl::ScreenMap(map.data(), map.size());

    fl::vector<fl::vec2f> map2;
    make_map(-1, -1, NUM_LEDS, &map2);
    fl::ScreenMap screenmap2 = fl::ScreenMap(map2.data(), map2.size());

    FastLED.addLeds<WS2811, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS)
        .setScreenMap(screenmap);

    FastLED.addLeds<WS2811, LED_PIN+1, COLOR_ORDER>(leds2, NUM_LEDS)
        .setScreenMap(screenmap2);
}

void loop() {
    FastLED.show();
}


#else

void setup() {
    Serial.begin(115200);
    Serial.println("setup");
}

void loop() {
    Serial.println("loop");
}

#endif  // __EMSCRIPTEN__