From 6f5f9793da3b40c97e0826c4418a99f71fa31426 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <karel.koci@nic.cz>
Date: Thu, 2 Feb 2017 17:21:43 +0100
Subject: Implement

---
 src/turris-lcd.cpp | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 123 insertions(+), 2 deletions(-)

diff --git a/src/turris-lcd.cpp b/src/turris-lcd.cpp
index 034fc94..a3a8de8 100644
--- a/src/turris-lcd.cpp
+++ b/src/turris-lcd.cpp
@@ -1,17 +1,138 @@
 #include <iostream>
+#include <cstring>
+#include <cstdio>
+#include <cstdlib>
+#include <string>
 #include <LiquidCrystal_I2C.h>
+#include <unistd.h>
+#include <vector>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <cerrno>
+#include <queue>
+#include <sstream>
+
 
 using namespace std;
 
+const char omnia_str[] = "Turris Omnia feed:";
+
+const int deftimeout = 2;
+const char *pipe_path = "/tmp/turris-lcd";
+
+void matrix_set(string str, int offset, int line, char (&matrix)[4][20]) {
+	for (int i = 0; i < 20; i++) {
+		if (str.length() > offset) {
+			matrix[line][i] = str[offset];
+			offset++;
+		} else
+			matrix[line][i] = ' ';
+	}
+}
+
+void read_pipe(vector<string> &messages, queue<int> &newone, int pipe) {
+	string msg = "";
+	char c;
+	int ec;
+	while ((ec = read(pipe, &c, 1)) > 0) {
+		if (c == '\n') {
+			newone.push(messages.size());
+			messages.push_back(msg);
+			cout << "Input: " << msg << "\n";
+		} else
+			msg += c;
+	}
+	if (ec < 0 && errno != EAGAIN) {
+		cout << "Input broken! " << strerror(errno) << "\n";
+		exit(1);
+	}
+}
+
 int main(int argc, char *argv[]) {
+	/*
+	if (argc < 1) {
+		cout << "Please pass i2c device as first argument\n";
+		exit(1);
+	}*/
 	// Initialize LCD
 	LiquidCrystal_I2C lcd("/dev/i2c-7", 0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
 	lcd.begin(20, 4);
 
+	char matrix[4][20];
+
 	lcd.on();
 	lcd.clear();
+	// Autoscroll doesn't work as expected for some reason, probably cheap display
+
+	mkfifo(pipe_path, NULL);
+	errno = 0; // ignore if file exists
+	int pipe = open(pipe_path, O_RDONLY | O_NONBLOCK);
+
+	vector<string> messages;
+	queue<int> newone;
+	messages.push_back("");
+	messages.push_back("");
+	messages.push_back("");
+
+	int msgs[3] = {0, 1, 2};
+	int offsets[3] = {0, 0, 0};
+	int timeout[3] = {deftimeout, deftimeout, deftimeout};
+	int number_timeout = 0;
+
+	while (true) {
+		// Read new lones from pipe
+		read_pipe(messages, newone, pipe);
+
+		if (number_timeout > 3) {
+			ostringstream ss;
+			ss << "In total #";
+			ss << (messages.size() - 3);
+			matrix_set(ss.str(), 0, 0, matrix);
+		} else
+			matrix_set(omnia_str, 0, 0, matrix);
+		number_timeout++;
+		if (number_timeout > 6)
+			number_timeout = 0;
+
+		// Update matrix
+		for (int i = 0; i < 3; i++) {
+			matrix_set(messages[msgs[i]], offsets[i], i + 1, matrix);
+			// Update offsets
+			if (messages[msgs[i]].length() - offsets[i] > 20)
+				offsets[i]++;
+			else if (timeout[i] > 0)
+				timeout[i]--;
+			else {
+				offsets[i] = 0;
+				timeout[i] = deftimeout;
+				if (newone.empty()) {
+					int nw;
+					bool fine = false;
+					while (!fine) {
+						nw = rand() % messages.size();
+						fine = true;
+						for (int s = 0; s < 3; s++) {
+							if (s != i && msgs[s] == nw)
+								fine = false;
+						}
+					}
+					msgs[i] = nw;
+				} else {
+					msgs[i] = newone.front();
+					newone.pop();
+				}
+			}
+		}
 
-	lcd.print("Turris Omnia");
+		// Render matrix
+		for (int i = 0; i < 4; i++) {
+			lcd.setCursor(0, i);
+			for (int y = 0; y < 20; y++) {
+				lcd.write(matrix[i][y]);
+			}
+		}
 
-	return 0;
+		usleep(600000);
+	}
 }
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