/* ESP32 plus MAX7219 LED Matrix that displays messages received via a WiFi connection using a Web Server
  #######################################################################################################################################
  This software, the ideas and concepts is Copyright (c) David Bird 2020. All rights to this software are reserved.

  Any redistribution or reproduction of any part or all of the contents in any form is prohibited other than the following:
  1. You may print or download to a local hard disk extracts for your personal and non-commercial use only.
  2. You may copy the content to individual third parties for their personal use, but only if you acknowledge the author David Bird as the source of the material.
  3. You may not, except with my express written permission, distribute or commercially exploit the content.
  4. You may not transmit it or store it in any other website or other form of electronic retrieval system for commercial purposes.

  The above copyright ('as annotated') notice and this permission notice shall be included in all copies or substantial portions of the Software and where the
  software use is visible to an end-user.

  THE SOFTWARE IS PROVIDED "AS IS" FOR PRIVATE USE ONLY, IT IS NOT FOR COMMERCIAL USE IN WHOLE OR PART OR CONCEPT. FOR PERSONAL USE IT IS SUPPLIED 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 AUTHOR OR COPYRIGHT HOLDER 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.
  See more at http://www.dsbird.org.uk
*/

//################# LIBRARIES ##########################
#include <WiFi.h>
//#include <ESPAsyncWebServer.h>          // Built-in
#include <ESPAsyncWebSrv.h>
int    pinCS = 4;                       // Attach CS to this pin, DIN to MOSI and CLK to SCK
//     MOSI  = 23;                      // Attach MOSI on display to this pin
//     CLK   = 18;                      // Attach CLK on display to this pin

#include <DNSServer.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include "MD_MAXPanel.h"

int    numberOfHorizontalDisplays = 4;
int    numberOfVerticalDisplays   = 1;
char   time_value[20];
String message, webpage;

//################# DISPLAY CONNECTIONS ################
// LED Matrix Pin -> ESP8266 Pin
// Vcc            -> 3v  (3V3 on ESP32)
// Gnd            -> Gnd (Gnd/G on ESP32)
// DIN            -> MOSI
// CS             -> pinCS
// CLK            -> CLK

//################ PROGRAM SETTINGS ####################
String version = "v3.0";       // Version of this program

AsyncWebServer server(80); // Start server on port 80 (default for a web-browser, change to your requirements, e.g. 8080 if your Router uses port 80

MD_MAXPanel matrix = MD_MAXPanel(pinCS, numberOfHorizontalDisplays, numberOfVerticalDisplays);

int wait   = 75; // In milliseconds between scroll movements
int spacer = 1;
int width  = 5 + spacer; // The font width is 5 pixels
String SITE_WIDTH =  "1000";

void setup() {
  Serial.begin(115200); // initialize serial communications
  while(!Serial);
  Serial.println("Starting...");
  //The network established by softAP will have default IP address of 192.168.4.1. This address may be changed using softAPConfig.
  IPAddress local_IP(192, 168, 4, 1);                      // Use the same adress here as defualt softAP
  IPAddress gateway(192, 168, 4, 1);
  IPAddress subnet(255, 255, 255, 0);
  Serial.print("\rSetting soft-AP configuration ... ");
  // Create SoftAP
  Serial.println(WiFi.softAP("ScrollMsgBoard", "") ? "Ready" : "Failed!"); // No Password set!
  Serial.println(WiFi.softAPConfig(local_IP, gateway, subnet) ? "Ready" : "Failed!");
  Serial.println("Now connect to this new Access Point, by searching for the SSID: 'ScrollMsgBoard' then connect to it");
  Serial.print(F("Use this URL to connect: http://")); Serial.println(WiFi.softAPIP().toString() + "/"); // Print the IP address

  //----------------------------------------------------------------------
  server.on("/", HTTP_GET, [](AsyncWebServerRequest * request) {
    GetMessage();
    request->send(200, "text/html", webpage);
  });
  server.on("/getmessageinput", HTTP_GET, [](AsyncWebServerRequest * request) {
    message = request->arg("message");
    request->redirect("/");
  });
  server.begin(); Serial.println(F("Webserver started..."));
  matrix.setIntensity(2);    // Use a value between 0 and 15 for brightness
  matrix.setRotation(0, 1);  // The first display is position upside down
  matrix.setRotation(1, 1);  // The first display is position upside down
  matrix.setRotation(2, 1);  // The first display is position upside down
  matrix.setRotation(3, 1);  // The first display is position upside down
  wait    = 25;
  message = "Message Board (C) C.V.Rao 2020";
  display_message(message); // Display the message
  wait    = 50;
  message = "IP address is 192.168.4.1";
  display_message(message); // Display the message
  wait    = 50;
 message = "HIGH SPEED BSNL FIBER NET ATTRACTIVE TARIFF PLANS PLEASE CALL GAXIOM  9480959459 ";
  //message ="Welcome..";
}

void loop() {
  display_message(message); // Display the message
}

void display_message(String message) {
  Serial.println(message);
  for ( int i = 0 ; i < width * (int)message.length() + matrix.width() - spacer; i++ ) {
    //matrix.fillScreen(LOW);
    int letter = i / width;
    int x = (matrix.width() - 1) - i % width;
    int y = (matrix.height() - 8) / 2; // center the text vertically
    while ( x + width - spacer >= 0 && letter >= 0 ) {
      if ( letter < (int)message.length() ) {
        matrix.drawChar(x, y, message[letter], HIGH, LOW, 1); // HIGH LOW means foreground ON, background OFF, reverse these to invert the display!
      }
      letter--;
      x -= width;
    }
    matrix.write(); // Send text to display
    delay(wait / 1.5);
  }
}

void GetMessage() {
  webpage = ""; // don't delete this command, it ensures the server works reliably!
  append_page_header();
  webpage += F("<h3>Enter the message to be displayed then press Enter</h3><br>");
  webpage += "<FORM action='getmessageinput'>";
  webpage += F("Enter the required message text:<br><br><input type='text' size='50' name='message' value='' >");
  webpage += F("</form><br/><br/>");
  append_page_footer();
}

void append_page_header() {
  webpage  = "<!DOCTYPE html><html lang='en'>";
  webpage += "<head>";
  webpage += "<title>Message Board</title>";
  webpage += "<meta charset='UTF-8'>";
  webpage += "<meta http-equiv='refresh' content='60'>"; // 60-secs refresh time
  webpage += "<style>";
  webpage += "body {width:";
  webpage += SITE_WIDTH;
  //webpage += "px;margin:0 auto;font-family:arial;font-size:14px;text-align:center;color:#cc66ff;background-color:#F7F2Fd;}";
  webpage += "px;margin:0 auto;font-family:arial;font-size:14px;text-align:center;color:#CD5C5C;background-color:#F7F2Fd;}";
  webpage += "ul{list-style-type:none;margin:0;padding:0;overflow:hidden;background-color:#d8d8d8;font-size:14px;}";
  webpage += "li{float:left;border-right:1px solid #bbb;}last-child {border-right:none;}";
  webpage += "li a{display: block;padding:2px 12px;text-decoration:none;}";
  webpage += "li a:hover{background-color:#FFFFFF;}";
  webpage += "section {font-size:16px;}";
  webpage += "p {background-color:#E3D1E2;font-size:16px;}";
  webpage += "div.header,div.footer{padding:0.5em;color:white;background-color:gray;clear:left;}";
  webpage += "h1{background-color:#d8d8d8;font-size:26px;}";
  //webpage += "h2{color:#9370DB;font-size:22px;line-height:65%;}";
  webpage += "h2{color:#CD5C5C;font-size:22px;line-height:65%;}";
  //webpage += "h3{color:#9370DB;font-size:16px;line-height:55%;}";
  webpage += "h3{color:#CD5C5C;font-size:16px;line-height:55%;}";
  webpage += "</style></head><body><h1>Scrolling Message Display Board ";
  webpage += version + "</h1>";
}

void old_append_page_footer() { // Saves repeating many lines of code for HTML page footers
  webpage += F("<ul><li><a href='/'>Enter Message</a></li></ul>");
  webpage += "&copy;" + String(char(byte(0x40 >> 1))) + String(char(byte(0x88 >> 1))) + String(char(byte(0x5c >> 1))) + String(char(byte(0x98 >> 1))) + String(char(byte(0x5c >> 1)));
  webpage += String(char((0x84 >> 1))) + String(char(byte(0xd2 >> 1))) + String(char(0xe4 >> 1)) + String(char(0xc8 >> 1)) + String(char(byte(0x40 >> 1)));
  webpage += String(char(byte(0x64 / 2))) + String(char(byte(0x60 >> 1))) + String(char(byte(0x64 >> 1))) + String(char(0x60 >> 1));
  webpage += F("</body></html>");
}

void append_page_footer() { // Saves repeating many lines of code for HTML page footers
  webpage += F("<ul><li><a href='/'>Enter Message</a></li></ul>");
  webpage += "&copy;"+String(char(byte(0x40>>1)))+String(char(byte(0x87>>1)))+String(char(byte(0x5c>>1)))+"V Rao";
 // webpage += "&copy;" + String(char(byte(0x40 >> 1))) + String(char(byte(0x88 >> 1))) + String(char(byte(0x5c >> 1))) + String(char(byte(0x98 >> 1))) + String(char(byte(0x5c >> 1)));
  //webpage += String(char((0x84 >> 1))) + String(char(byte(0xd2 >> 1))) + String(char(0xe4 >> 1)) + String(char(0xc8 >> 1)) + String(char(byte(0x40 >> 1)));
  //webpage += String(char(byte(0x64 / 2))) + String(char(byte(0x60 >> 1))) + String(char(byte(0x62 >> 1))) + String(char(0x6e >> 1)) + "</div>";
  webpage += F("</body></html>");
}