/*
  WiFlash_esp32 - Concept & electronics:    Phil Abeyta
                - System design & firmware: Kevin Matz

  Uses a GPIO to control a lighting console over OSC, whilst also
  controlling an LED strobe light with DMX data recieved over sACN.

  Copyright (c) 2020 Kevin Matz (kevin.matz@gmail.com)

  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.
*/

#include <Arduino.h>
#include <WiFi.h>
#include <ESPmDNS.h>
#include <SPIFFS.h>
#include <ArduinoOSC.h>
#include <NeoPixelBus.h>
#include <ESPAsyncWebServer.h>
#include "configure.h"
#include "status.h"
#include "sacn.h"
#include "strobe_esp32.h"
#include "dmx_universe.h"


//// device objects
Strobe *strobe;
NeoPixelBus<NeoGrbwFeature, Neo800KbpsMethod> *strip;
ESPsACN *e131 = new ESPsACN();
AsyncWebServer *httpd = new AsyncWebServer(80);


//// Global button variables
bool pressed = false;    // track button state


/*
   Start the async web server
*/
void startHTTPD() {
  httpd->on("/api/config", HTTP_GET, [](AsyncWebServerRequest * request) {
    AsyncWebServerResponse *response = request->beginResponse(SPIFFS, "/template/configuration.json", "application/json", false, config::getString);
    response->addHeader("Access-Control-Allow-Origin", "*");
    request->send(response);
  });

  httpd->on("/api/status", HTTP_GET, [](AsyncWebServerRequest * request) {
    AsyncWebServerResponse *response = request->beginResponse(SPIFFS, "/template/status.json", "application/json", false, status::getString);
    response->addHeader("Access-Control-Allow-Origin", "*");
    request->send(response);
  });

  httpd->on("/api/reboot", HTTP_POST, [](AsyncWebServerRequest * request) {
    String url = "http://" + config::settings().hostname + ".local";
    request->redirect(url.c_str());
    httpd->end();
    ESP.restart();
  });

  httpd->on("/api/set", HTTP_POST, [] (AsyncWebServerRequest * request) {
    if (!request->hasParam("key", true) ||
        !request->hasParam("value", true)) {
      request->send(404, "text/plain", "Missing parameter.");
      return;
    }
    String key = request->getParam("key", true)->value();
    const String& val = request->getParam("value", true)->value();
    key.toUpperCase();
    if (val == config::getString(key)) {
      // already at value
      request->send(204);
    } else if (config::set(key, val) > 0) {
      // change accepted OK
      request->send(205);
    } else {
      // change failed, return current value
      String json = "{\"" + key + "\": \"" + config::getString(key) + "\"}";
      request->send(403, "application/json", json);
    }
  });

  httpd->serveStatic("/", SPIFFS, "/www/").setDefaultFile("index.html");

  httpd->onNotFound([](AsyncWebServerRequest * request) {
    request->send(404, "text/plain", "Not found");
  });

  httpd->begin();
}


/*
   change pixel strip colours on DMX change
*/
void recvPixelData(Universe *universe) {
  for (int i = 0; i < config::settings().strip_led_count; i++) {
    uint8_t r, g, b, w;
    r = universe->data()->data[config::settings().strip_address + (i * 4) + 0];
    g = universe->data()->data[config::settings().strip_address + (i * 4) + 1];
    b = universe->data()->data[config::settings().strip_address + (i * 4) + 2];
    w = universe->data()->data[config::settings().strip_address + (i * 4) + 3];
    strip->SetPixelColor(i, RgbwColor(r, g, b, w));
  }
  strip->Show();
}


/*
   Arduino powerup
*/
void setup() {
  Serial.begin(115200);
  while (!Serial); // wait for serial attach
  Serial.println("Serial started!");

  Serial.println("Loading Prefferences from NVM.");
  config::loadConfig();

  //// start WiFi:
  // set IPv4
  Serial.println("Starting WiFi.");
  WiFi.mode(config::settings().mode);
  IPAddress ip_, gateway_, subnet_;
  if (!config::settings().dhcp) {
    ip_.fromString(config::settings().ip);
    gateway_.fromString(config::settings().gateway);
    subnet_.fromString(config::settings().subnet);
  }
  switch (config::settings().mode) {
    case WIFI_AP: {
        WiFi.softAPsetHostname(config::settings().hostname.c_str());
        if (!config::settings().dhcp) {
          WiFi.softAPConfig(ip_, gateway_, subnet_);
        }
        WiFi.softAP(config::settings().ssid.c_str(), config::settings().pwd.c_str());
      }
      break;
    case WIFI_STA: {
        WiFi.setHostname(config::settings().hostname.c_str());
        if (!config::settings().dhcp) {
          WiFi.config(ip_, gateway_, subnet_);
        }
        WiFi.begin(config::settings().ssid.c_str(), config::settings().pwd.c_str());
      }
      break;
  }
  Serial.print("Access the configuration web page at http://");
  Serial.print(config::settings().hostname.c_str());
  Serial.println(".local");

  Serial.println("Disabling Bluetooth.");
  btStop();

  Serial.println("Mounting SPI Flash FS.");
  SPIFFS.begin();

  Serial.println("Starting HTTP interface.");
  startHTTPD();

  Serial.println("Starting mDNS responder.");
  if (MDNS.begin(config::settings().hostname.c_str())) {
    MDNS.addService("http", "tcp", 80);
  }

  //// start fixtures hardware:
  // battery monitor
  pinMode(status::battery_sense, INPUT);

  // button
  if (config::settings().button_enable) {
    Serial.println("Initializing OSC button");
    pinMode(config::settings().button_pin, INPUT_PULLUP);
  }

  // strobe
  if (config::settings().strobe_enable) {
    strobe = new Strobe(config::settings().strobe_address);
    Serial.println("Initializing DMX Strobe");
    if (!strobe->begin(config::settings().strobe_led_pin, 0)) {
      Serial.println("Strobe failed to configure.");
    }
    if (e131->subscribe(config::settings().strobe_universe)) {
      e131->universe(config::settings().strobe_universe)->onData(std::bind(&Strobe::recvData,
          strobe, std::placeholders::_1));
    }
  }

  // pixels
  if (config::settings().strip_enable) {
    Serial.println("Initializing Pixelmapped LEDs.");

    strip = new NeoPixelBus<NeoGrbwFeature, Neo800KbpsMethod>(config::settings().strip_led_count, config::settings().strip_data_pin);
    strip->Begin();
    strip->Show();
    if (e131->subscribe(config::settings().strip_universe)) {
      e131->universe(config::settings().strip_universe)->onData(std::bind(&recvPixelData,
          std::placeholders::_1));
    }
  }

  Serial.println("Setup complete!");
}


/*
    Arduino process loop
*/
void loop() {
  if (config::settings().mode == WIFI_STA &&
      WiFi.status() != WL_CONNECTED) {
    Serial.println("Waiting for WiFi...");
    delay(1000);
    return;
  }

  // Be a remote trigger
  //
  bool val = !digitalRead(config::settings().button_pin);
  if (val != pressed && config::settings().button_enable) {
    pressed = val;
    if (pressed) {
      Serial.println("Pressed");
      OscWiFi.send(config::settings().osc_host, config::settings().osc_port,
                   config::settings().osc_pressed_addr, config::settings().osc_pressed_value);
    } else {
      Serial.println("Released");
      OscWiFi.send(config::settings().osc_host, config::settings().osc_port,
                   config::settings().osc_released_addr, config::settings().osc_released_value);
    }
  }
}