/*
GARLAND MODULE
Copyright (C) 2020 by Dmitry Blinov <dblinov76 at gmail dot com>

Inspired by https://github.com/Vasil-Pahomov/ArWs2812 (currently https://github.com/Vasil-Pahomov/Liana)

Tested on 300 led strip.

The most time consuming operation is actually showing leds by Adafruit Neopixel. It take about 1870 mcs.
More long strip can take more time to show.
Currently animation calculation, brightness calculation/transition and showing makes in one loop cycle.
Debug output shows timings. Overal timing should be not more that 3000 ms.
*/

#include "garland.h"

#if GARLAND_SUPPORT

#include <Adafruit_NeoPixel.h>

#include <vector>

#include "garland/color.h"
#include "garland/palette.h"
#include "garland/scene.h"
#include "ws.h"

const char* NAME_GARLAND_ENABLED        = "garlandEnabled";
const char* NAME_GARLAND_BRIGHTNESS     = "garlandBrightness";
const char* NAME_GARLAND_SPEED          = "garlandSpeed";

const char* NAME_GARLAND_SWITCH         = "garland_switch";
const char* NAME_GARLAND_SET_BRIGHTNESS = "garland_set_brightness";
const char* NAME_GARLAND_SET_SPEED      = "garland_set_speed";
const char* NAME_GARLAND_SET_DEFAULT    = "garland_set_default";

#define EFFECT_UPDATE_INTERVAL_MIN      5000  // 5 sec
#define EFFECT_UPDATE_INTERVAL_MAX      10000 // 10 sec

#define NUMLEDS_CAN_CAUSE_WDT_RESET     100

bool _garland_enabled                   = true;
unsigned long _last_update              = 0;
unsigned long _interval_effect_update;

// Palette should
Palette pals[] = {
    // palettes below are taken from http://www.color-hex.com/color-palettes/ (and modified)
    // RGB: Red,Green,Blue sequence
    Palette("RGB", {0xFF0000, 0x00FF00, 0x0000FF}),

    // Rainbow: Rainbow colors
    Palette("Rainbow", {0xFF0000, 0xAB5500, 0xABAB00, 0x00FF00, 0x00AB55, 0x0000FF, 0x5500AB, 0xAB0055}),

    // RainbowStripe: Rainbow colors with alternating stripes of black
    Palette("Stripe", {0xFF0000, 0x000000, 0xAB5500, 0x000000, 0xABAB00, 0x000000, 0x00FF00, 0x000000,
                       0x00AB55, 0x000000, 0x0000FF, 0x000000, 0x5500AB, 0x000000, 0xAB0055, 0x000000}),

    // Party: Blue purple ping red orange yellow (and back). Basically, everything but the greens.
    // This palette is good for lighting at a club or party.
    Palette("Party", {0x5500AB, 0x84007C, 0xB5004B, 0xE5001B, 0xE81700, 0xB84700, 0xAB7700, 0xABAB00,
                      0xAB5500, 0xDD2200, 0xF2000E, 0xC2003E, 0x8F0071, 0x5F00A1, 0x2F00D0, 0x0007F9}),

    // Heat: Approximate "black body radiation" palette, akin to the FastLED 'HeatColor' function.
    // Recommend that you use values 0-240 rather than the usual 0-255, as the last 15 colors will be
    // 'wrapping around' from the hot end to the cold end, which looks wrong.
    Palette("Heat", {0x700070, 0xFF0000, 0xFFFF00, 0xFFFFCC}),

    // Fire:
    Palette("Fire", {0x000000, 0x220000, 0x880000, 0xFF0000, 0xFF6600, 0xFFCC00}),

    // Blue:
    Palette("Blue", {0xffffff, 0x0000ff, 0x00ffff}),

    // Sun: Slice Of The Sun
    Palette("Sun", {0xfff95b, 0xffe048, 0xffc635, 0xffad22, 0xff930f}),

    // Lime: yellow green mix
    Palette("Lime", {0x51f000, 0x6fff00, 0x96ff00, 0xc9ff00, 0xf0ff00}),

    // Pastel: Pastel Fruity Mixture
    Palette("Pastel", {0x75aa68, 0x5960ae, 0xe4be6c, 0xca5959, 0x8366ac})};

constexpr size_t palsSize() { return sizeof(pals)/sizeof(pals[0]); }

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(GARLAND_LEDS, GARLAND_D_PIN, NEO_GRB + NEO_KHZ800);
Scene scene(&pixels);

Anim* anims[] = {new AnimStart(), new AnimPixieDust(), new AnimSparkr(), new AnimRun(), new AnimStars(), new AnimSpread(), 
                 new AnimRandCyc(), new AnimFly(), new AnimComets(), new AnimAssemble(), new AnimDolphins(), new AnimSalut()};

constexpr size_t animsSize() { return sizeof(anims)/sizeof(anims[0]); }

//------------------------------------------------------------------------------
void garlandDisable() {
    pixels.clear();
}

//------------------------------------------------------------------------------
void garlandEnabled(bool enabled) {
    _garland_enabled = enabled;
}

//------------------------------------------------------------------------------
bool garlandEnabled() {
    return _garland_enabled;
}

//------------------------------------------------------------------------------
// Setup
//------------------------------------------------------------------------------
void _garlandConfigure() {
    _garland_enabled = getSetting(NAME_GARLAND_ENABLED, true);
    DEBUG_MSG_P(PSTR("[GARLAND] _garland_enabled = %d\n"), _garland_enabled);

    byte brightness = getSetting(NAME_GARLAND_BRIGHTNESS, 255);
    scene.setBrightness(brightness);
    DEBUG_MSG_P(PSTR("[GARLAND] brightness = %d\n"), brightness);

    float speed = getSetting(NAME_GARLAND_SPEED, 50);
    scene.setSpeed(speed);
}

//------------------------------------------------------------------------------
void _garlandReload() {
    _garlandConfigure();
}

#if WEB_SUPPORT
//------------------------------------------------------------------------------
void _garlandWebSocketOnConnected(JsonObject& root) {
    root[NAME_GARLAND_ENABLED] = garlandEnabled();
    root[NAME_GARLAND_BRIGHTNESS] = scene.getBrightness();
    root[NAME_GARLAND_SPEED] = scene.getSpeed();
    root["garlandVisible"] = 1;
}

//------------------------------------------------------------------------------
bool _garlandWebSocketOnKeyCheck(const char* key, JsonVariant& value) {
    if (strncmp(key, NAME_GARLAND_ENABLED, strlen(NAME_GARLAND_ENABLED)) == 0) return true;
    if (strncmp(key, NAME_GARLAND_BRIGHTNESS, strlen(NAME_GARLAND_BRIGHTNESS)) == 0) return true;
    if (strncmp(key, NAME_GARLAND_SPEED, strlen(NAME_GARLAND_SPEED)) == 0) return true;
    return false;
}

//------------------------------------------------------------------------------
void _garlandWebSocketOnAction(uint32_t client_id, const char* action, JsonObject& data) {
    if (strcmp(action, NAME_GARLAND_SWITCH) == 0) {
        if (data.containsKey("status") && data.is<int>("status")) {
            _garland_enabled = (1 == data["status"].as<int>());
            setSetting(NAME_GARLAND_ENABLED, _garland_enabled);
            if (!_garland_enabled) {
                schedule_function([](){
                    pixels.clear();
                    pixels.show();
                });
            }
        }
    }

    if (strcmp(action, NAME_GARLAND_SET_BRIGHTNESS) == 0) {
        if (data.containsKey("brightness")) {
            byte new_brightness = data.get<byte>("brightness");
            DEBUG_MSG_P(PSTR("[GARLAND] new brightness = %d\n"), new_brightness);
            setSetting(NAME_GARLAND_BRIGHTNESS, new_brightness);
            scene.setBrightness(new_brightness);
        }
    }

    if (strcmp(action, NAME_GARLAND_SET_SPEED) == 0) {
        if (data.containsKey("speed")) {
            byte new_speed = data.get<byte>("speed");
            DEBUG_MSG_P(PSTR("[GARLAND] new speed = %d\n"), new_speed);
            setSetting(NAME_GARLAND_SPEED, new_speed);
            scene.setSpeed(new_speed);
        }
    }

    if (strcmp(action, NAME_GARLAND_SET_DEFAULT) == 0) {
        scene.setDefault();
        byte brightness = scene.getBrightness();
        setSetting(NAME_GARLAND_BRIGHTNESS, brightness);
        byte speed = scene.getSpeed();
        setSetting(NAME_GARLAND_SPEED, speed);
        char buffer[128];
        snprintf_P(buffer, sizeof(buffer), PSTR("{\"garlandBrightness\": %d, \"garlandSpeed\": %d}"), brightness, speed);
        wsSend(buffer);
    }
}
#endif

//------------------------------------------------------------------------------
// Loop
//------------------------------------------------------------------------------
void garlandLoop(void) {
    if (!garlandEnabled())
        return;

    scene.run();

    unsigned long animation_time = millis() - _last_update;
    if (animation_time > _interval_effect_update && scene.finishedAnimCycle()) {
        _last_update = millis();
        _interval_effect_update = secureRandom(EFFECT_UPDATE_INTERVAL_MIN, EFFECT_UPDATE_INTERVAL_MAX);

        static int animInd    = 0;
        int prevAnimInd = animInd;
        while (prevAnimInd == animInd) animInd = secureRandom(1, animsSize());

        static int paletteInd = 0;
        int prevPalInd = paletteInd;
        while (prevPalInd == paletteInd) paletteInd = secureRandom(palsSize());

        int numShows = scene.getNumShows();
        int frameRate = animation_time > 0 ? numShows * 1000 / animation_time : 0;

        DEBUG_MSG_P(PSTR("[GARLAND] Anim: %-10s Pal: %-8s timings: calc: %4d pixl: %3d show: %4d frate: %d\n"),
                    anims[prevAnimInd]->name(), pals[prevPalInd].name(),
                    scene.getAvgCalcTime(), scene.getAvgPixlTime(), scene.getAvgShowTime(), frameRate);
        DEBUG_MSG_P(PSTR("[GARLAND] Anim: %-10s Pal: %-8s Inter: %d\n"),
                    anims[animInd]->name(), pals[paletteInd].name(), _interval_effect_update);

        scene.setAnim(anims[animInd]);
        scene.setPalette(&pals[paletteInd]);
        scene.setup();
    }
}

//------------------------------------------------------------------------------
void garlandSetup() {
    _garlandConfigure();

// Websockets
#if WEB_SUPPORT
    wsRegister()
        .onConnected(_garlandWebSocketOnConnected)
        .onKeyCheck(_garlandWebSocketOnKeyCheck)
        .onAction(_garlandWebSocketOnAction);
#endif

    espurnaRegisterLoop(garlandLoop);
    espurnaRegisterReload(_garlandReload);

    pixels.begin();
    scene.setAnim(anims[0]);
    scene.setPalette(&pals[0]);
    scene.setup();

    _interval_effect_update = secureRandom(EFFECT_UPDATE_INTERVAL_MIN, EFFECT_UPDATE_INTERVAL_MAX);
}

/*#######################################################################
  _____
 / ____|
| (___     ___    ___   _ __     ___
 \___ \   / __|  / _ \ | '_ \   / _ \
 ____) | | (__  |  __/ | | | | |  __/
|_____/   \___|  \___| |_| |_|  \___|
#######################################################################*/

#define GARLAND_SCENE_TRANSITION_MS      1000    // transition time between animations, ms
#define GARLAND_SCENE_SPEED_MAX          70
#define GARLAND_SCENE_SPEED_FACTOR       10
#define GARLAND_SCENE_DEFAULT_SPEED      50
#define GARLAND_SCENE_DEFAULT_BRIGHTNESS 255

Scene::Scene(Adafruit_NeoPixel* pixels)
    : _pixels(pixels),
      _numLeds(pixels->numPixels()),
      _leds1(_numLeds),
      _leds2(_numLeds),
      _ledstmp(_numLeds),
      _seq(_numLeds) {
}

void Scene::setPalette(Palette* palette) {
    _palette = palette;
    if (setUpOnPalChange) {
        setupImpl();
    }
}

void Scene::setBrightness(byte brightness) {
    DEBUG_MSG_P(PSTR("[GARLAND] Scene::setBrightness = %d\n"), brightness);
    this->brightness = brightness;
}

byte Scene::getBrightness() {
    DEBUG_MSG_P(PSTR("[GARLAND] Scene::getBrightness = %d\n"), brightness);
    return brightness;
}

// Speed is reverse to cycleFactor and 10x
void Scene::setSpeed(byte speed) {
    this->speed = speed;
    cycleFactor = (float)(GARLAND_SCENE_SPEED_MAX - speed) / GARLAND_SCENE_SPEED_FACTOR;
    DEBUG_MSG_P(PSTR("[GARLAND] Scene::setSpeed %d cycleFactor = %d\n"), speed, (int)(cycleFactor * 1000));
}

byte Scene::getSpeed() {
    DEBUG_MSG_P(PSTR("[GARLAND] Scene::getSpeed %d cycleFactor = %d\n"), speed, (int)(cycleFactor * 1000));
    return speed;
}

void Scene::setDefault() {
    speed = GARLAND_SCENE_DEFAULT_SPEED;
    cycleFactor = (float)(GARLAND_SCENE_SPEED_MAX - speed) / GARLAND_SCENE_SPEED_FACTOR;
    brightness = GARLAND_SCENE_DEFAULT_BRIGHTNESS;
    DEBUG_MSG_P(PSTR("[GARLAND] Scene::setDefault speed = %d cycleFactor = %d brightness = %d\n"), speed, (int)(cycleFactor * 1000), brightness);
}

void Scene::run() {
    unsigned long iteration_start_time = micros();

    if (state == Calculate || cyclesRemain < 1) {
        // Calculate number of cycles for this animation iteration
        float cycleSum = cycleFactor * (_anim ? _anim->getCycleFactor() : 1.0) + cycleTail;
        cyclesRemain = cycleSum;
        if (cyclesRemain < 1) {
            cyclesRemain = 1;
            cycleSum = 0;
            cycleTail = 0;
        } else {
            cycleTail = cycleSum - cyclesRemain;
        }

        if (_anim) {
            _anim->Run();
        }

        sum_calc_time += (micros() - iteration_start_time);
        iteration_start_time = micros();
        ++calc_num;
        state = Transition;
    }

    if (state == Transition && cyclesRemain < 3) {
        // transition coef, if within 0..1 - transition is active
        // changes from 1 to 0 during transition, so we interpolate from current
        // color to previous
        float transc = (float)((long)transms - (long)millis()) / GARLAND_SCENE_TRANSITION_MS;
        Color* leds_prev = (_leds == &_leds1[0]) ? &_leds2[0] : &_leds1[0];

        if (transc > 0) {
            for (int i = 0; i < _numLeds; i++) {
                // transition is in progress
                Color c = _leds[i].interpolate(leds_prev[i], transc);
                byte r = (int)(bri_lvl[c.r]) * brightness / 256;
                byte g = (int)(bri_lvl[c.g]) * brightness / 256;
                byte b = (int)(bri_lvl[c.b]) * brightness / 256;
                _pixels->setPixelColor(i, _pixels->Color(r, g, b));
            }
        } else {
            for (int i = 0; i < _numLeds; i++) {
                // regular operation
                byte r = (int)(bri_lvl[_leds[i].r]) * brightness / 256;
                byte g = (int)(bri_lvl[_leds[i].g]) * brightness / 256;
                byte b = (int)(bri_lvl[_leds[i].b]) * brightness / 256;
                _pixels->setPixelColor(i, _pixels->Color(r, g, b));
            }
        }

        sum_pixl_time += (micros() - iteration_start_time);
        iteration_start_time = micros();
        ++pixl_num;
        state = Show;
    }

    if (state == Show && cyclesRemain < 2) {
        /* Showing pixels (actually transmitting their RGB data) is most time consuming operation in the
        garland workflow. Using 800 kHz gives 1.25 μs per bit. -> 30 μs (0.03 ms) per RGB LED.
        So for example 3 ms for 100 LEDs. Unfortunately it can't be postponed and resumed later as it
        will lead to reseting the transmition operation. From other hand, long operation can cause
        Soft WDT reset. To avoid wdt reset we need to switch soft wdt off for long strips. 
        It is not best practice, but assuming that it is only garland, it can be acceptable.
        Tested up to 300 leds. */
        if (_numLeds > NUMLEDS_CAN_CAUSE_WDT_RESET) {
            ESP.wdtDisable();
        }
        _pixels->show();
        if (_numLeds > NUMLEDS_CAN_CAUSE_WDT_RESET) {
            ESP.wdtEnable(5000);
        }
        sum_show_time += (micros() - iteration_start_time);
        ++show_num;
        state = Calculate;
        ++numShows;
    }
    --cyclesRemain;
}

void Scene::setupImpl() {
    transms = millis() + GARLAND_SCENE_TRANSITION_MS;

    // switch operation buffers (for transition to operate)
    if (_leds == &_leds1[0]) {
        _leds = &_leds2[0];
    } else {
        _leds = &_leds1[0];
    }

    if (_anim) {
        _anim->Setup(_palette, _numLeds, _leds, &_ledstmp[0], &_seq[0]);
    }
}

void Scene::setup() {
    sum_calc_time = 0;
    sum_pixl_time = 0;
    sum_show_time = 0;
    calc_num = 0;
    pixl_num = 0;
    show_num = 0;
    numShows = 0;

    if (!setUpOnPalChange) {
        setupImpl();
    }
}

unsigned long Scene::getAvgCalcTime() { return sum_calc_time / calc_num; }
unsigned long Scene::getAvgPixlTime() { return sum_pixl_time / pixl_num; }
unsigned long Scene::getAvgShowTime() { return sum_show_time / show_num; }

/*#######################################################################
                    _                       _     _
    /\             (_)                     | |   (_)
   /  \     _ __    _   _ __ ___     __ _  | |_   _    ___    _ __
  / /\ \   | '_ \  | | | '_ ` _ \   / _` | | __| | |  / _ \  | '_ \
 / ____ \  | | | | | | | | | | | | | (_| | | |_  | | | (_) | | | | |
/_/    \_\ |_| |_| |_| |_| |_| |_|  \__,_|  \__| |_|  \___/  |_| |_|
#######################################################################*/

Anim::Anim(const char* name) : _name(name) {}

void Anim::Setup(Palette* palette, uint16_t numLeds, Color* leds, Color* ledstmp, byte* seq) {
    this->palette = palette;
    this->numLeds = numLeds;
    this->leds = leds;
    this->ledstmp = ledstmp;
    this->seq = seq;
    SetupImpl();
}

void Anim::initSeq() {
    for (int i = 0; i < numLeds; ++i)
        seq[i] = i;
}

void Anim::shuffleSeq() {
    for (int i = 0; i < numLeds; ++i) {
        byte ind = (unsigned int)(rngb() * numLeds / 256);
        if (ind != i) {
            std::swap(seq[ind], seq[i]);
        }
    }
}

void Anim::glowSetUp() {
    braPhaseSpd = secureRandom(4, 13);
    if (braPhaseSpd > 8) {
        braPhaseSpd = braPhaseSpd - 17;
    }
    braFreq = secureRandom(20, 60);
}

void Anim::glowForEachLed(int i) {
    int8 bra = braPhase + i * braFreq;
    bra = BRA_OFFSET + (abs(bra) >> BRA_AMP_SHIFT);
    leds[i] = leds[i].brightness(bra);
}

void Anim::glowRun() { braPhase += braPhaseSpd; }

bool operator== (const Color &c1, const Color &c2)
{
    return (c1.r == c2.r && c1.g == c2.g && c1.b == c2.b);
}

unsigned int rng() {
    static unsigned int y = 0;
    y += micros();  // seeded with changing number
    y ^= y << 2;
    y ^= y >> 7;
    y ^= y << 7;
    return (y);
}

// Ranom numbers generator in byte range (256) much faster than secureRandom.
// For usage in time-critical places.
byte rngb() { return (byte)rng(); }

#endif  // GARLAND_SUPPORT