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#include "web_server.h"
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Web server h -> cpp    
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#if defined(ESP8266)
#  include <ESP8266WebServer.h>
#elif defined(ESP32)
#  include <WebServer.h>
#endif

#include "config.h"
#include "util.h"
#include "wifi_util.h"
#include "co2_sensor.h"
#include "sensor_console.h"
#ifdef AMPEL_CSV
#  include "csv_writer.h"
#endif
#ifdef AMPEL_MQTT
#  include "mqtt.h"
#endif
#ifdef AMPEL_LORAWAN
#  include "lorawan.h"
#endif
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namespace config {
  // Values should be defined in config.h
#ifdef HTTP_USER
  const char *http_user = HTTP_USER;
#else
  const char *http_user = "";
#endif
#ifdef HTTP_PASSWORD
  const char *http_password = HTTP_PASSWORD;
#else
  const char *http_password = "";
#endif

}

namespace web_server {

  const char *header_template;
  const char *body_template;
  const char *script_template;
  void handleWebServerRoot();
  void handlePageNotFound();
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Basic webserver commands    
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  void handleWebServerCommand();
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#ifdef AMPEL_CSV
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  void handleDeleteCSV();
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  void handleWebServerCSV();
#endif
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#if defined(ESP8266)
  ESP8266WebServer http(80); // Create a webserver object that listens for HTTP request on port 80
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#elif defined(ESP32)
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  WebServer http(80);
#endif

  void update() {
    http.handleClient(); // Listen for HTTP requests from clients
  }

  void initialize() {
    header_template =
        PSTR("<!doctype html><html lang=en>"
            "<head>\n"
            "<title>%d ppm - CO2 SENSOR - %s - %s</title>\n"
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            "<meta charset='UTF-8'>\n"
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            // HfT Favicon
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            "<link rel='icon' type='image/png' sizes='16x16' href='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAHtJREFUOE9jvMnA+5+BAsBIFQMkl85h+P3kGcOb8jqwW+TPH2H4de0GA29UGNxtfx49YWCRk0HwHz5iuKegwwB2AS4DkA2F6VR6cAWsEQbgBqDY9vARw/ejJ+Au+LxsFcPz6BSwHpwGYPMCSS6gyAAKYhESiKMGjPgwAADopHVhn5ynEwAAAABJRU5ErkJggg=='/>\n"
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            // Responsive grid:
            "<link rel='stylesheet' href='https://unpkg.com/purecss@2.0.3/build/pure-min.css'>\n"
            "<link rel='stylesheet' href='https://unpkg.com/purecss@2.0.3/build/grids-responsive-min.css'>\n"
            // JS Graphs:
            "<script src='https://cdn.plot.ly/plotly-basic-1.58.2.min.js'></script>\n"
            // Fullscreen
            "<meta name='viewport' content='width=device-width, initial-scale=1'>\n"
            // Refresh after every measurement.
            // "<meta http-equiv='refresh' content='%d'>\n"
            "</head>\n"
            "<body>\n"
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Show a colored dot on webpage    
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            "<div class='pure-g'><div class='pure-u-1'><div class='pure-menu'><p class='pure-menu-heading'>HfT-Stuttgart CO<sub>2</sub> Ampel</p></div></div>\n"
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            "<div class='pure-u-1'><ul class='pure-menu pure-menu-horizontal pure-menu-list'>\n"
            "<li class='pure-menu-item'><a href='#table' class='pure-menu-link'>Info</a></li>\n"
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#ifdef AMPEL_CSV
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            "<li class='pure-menu-item'><a href='#graph' class='pure-menu-link'>Graph</a></li>\n"
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            "<li class='pure-menu-item'><a href='#log' class='pure-menu-link'>Log</a></li>\n"
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            "<li class='pure-menu-item'><a href='%s' class='pure-menu-link'>Download CSV</a></li>\n"
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#endif
            "<li class='pure-menu-item' id='led'>&#11044;</li>\n" // LED
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            "</ul></div></div>\n"
            "<script>\n"
            // Show a colored dot on the webpage, with a similar color than on LED Ring.
            "hue=(1-(Math.min(Math.max(parseInt(document.title),500),1600)-500)/1100)*120;\n"
            "document.getElementById('led').style.color=['hsl(',hue,',100%%,50%%)'].join('');\n"
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            "</script>\n"
            "<div class='pure-g'>\n"
            "<div class='pure-u-1' id='graph'></div>\n"// Graph placeholder
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            "</div>\n"
            "<div class='pure-g'>\n"
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            "<table id='table' class='pure-table-striped pure-u-1 pure-u-md-1-2'>\n");

    body_template =
        PSTR("<tr><th colspan='2'>%s</th></tr>\n"
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            "<tr><td>CO<sub>2</sub> concentration</td><td>%5d ppm</td></tr>\n"
            "<tr><td>Temperature</td><td>%.1f&#8451;</td></tr>\n"
            "<tr><td>Humidity</td><td>%.1f%%</td></tr>\n"
            "<tr><td>Last measurement</td><td>%s</td></tr>\n"
            "<tr><td>Measurement timestep</td><td>%5d s</td></tr>\n"
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#ifdef AMPEL_CSV
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            "<tr><th colspan='2'>CSV</th></tr>\n"
            "<tr><td>Last write</td><td>%s</td></tr>\n"
            "<tr><td>Timestep</td><td>%5d s</td></tr>\n"
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FIXMEs    
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            "<tr><td>Available drive space</td><td>%d kB</td></tr>\n"
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#endif
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#ifdef AMPEL_MQTT
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            "<tr><th colspan='2'>MQTT</th></tr>\n"
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            "<tr><td>Connected?</td><td>%s</td></tr>\n"
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            "<tr><td>Last publish</td><td>%s</td></tr>\n"
            "<tr><td>Timestep</td><td>%5d s</td></tr>\n"
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Show LoRaWAN info on web server    
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#endif
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LORAWAN -> AMPEL_LORAWAN    
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#if defined(AMPEL_LORAWAN) && defined(ESP32)
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            "<tr><th colspan='2'>LoRaWAN</th></tr>\n"
            "<tr><td>Connected?</td><td>%s</td></tr>\n"
            "<tr><td>Frequency</td><td>%s MHz</td></tr>\n"
            "<tr><td>Last transmission</td><td>%s</td></tr>\n"
            "<tr><td>Timestep</td><td>%5d s</td></tr>\n"
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#endif
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            "<tr><th colspan='2'>Sensor</th></tr>\n"
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TODO    
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            "<tr><td>Temperature offset</td><td>%.1fK</td></tr>\n" //TODO: Read it from sensor?
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Show auto-calibration in web-server    
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            "<tr><td>Auto-calibration?</td><td>%s</td></tr>\n"
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            "<tr><td>Local address</td><td><a href='http://%s.local/'>%s.local</a></td></tr>\n"
            "<tr><td>Local IP</td><td><a href='http://%s'>%s</a></td></tr>\n"
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            "<tr><td>MAC</td><td>%s</td></tr>\n"
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            "<tr><td>Free heap space</td><td>%6d bytes</td></tr>\n"
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            "<tr><td>Largest heap block</td><td>%6d bytes</td></tr>\n"
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            "<tr><td>Max loop duration</td><td>%5d ms</td></tr>\n"
            "<tr><td>Board</td><td>%s</td></tr>\n"
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            "<tr><td>Ampel firmware</td><td>%s</td></tr>\n"
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            "<tr><td>Uptime</td><td>%2d d %4d h %02d min %02d s</td></tr>\n"
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            "</table>\n"
            "<div id='log' class='pure-u-1 pure-u-md-1-2'></div>\n"
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Web form to send commands    
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            "<form action='/command'><input type='text' id='send' name='send'><input type='submit' value='Send'></form>\n"
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#ifdef AMPEL_CSV
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            "<form action='/delete_csv' method='POST' onsubmit=\"return confirm('Are you really sure you want to delete all data?') && (document.body.style.cursor = 'wait');\">"
            "<input type='submit' value='Delete CSV'/>"
            "</form>\n"
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#endif
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            "</div>\n");
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    script_template =
        PSTR(
            "<a href='https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-firmware' target='_blank'>Source code</a>\n"
                "<a href='https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-documentation' target='_blank'>Documentation</a>\n"
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#ifdef AMPEL_CSV
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            "<script>\n"
            "document.body.style.cursor = 'default';\n"
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            "fetch('%s',{credentials:'include'})\n"
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            ".then(response=>response.text())\n"
            ".then(csvText=>csvToTable(csvText))\n"
            ".then(htmlTable=>addLogTableToPage(htmlTable))\n"
            ".then(_=>Plotly.newPlot('graph',data,layout,{displaylogo:false}))\n"
            ".catch(e=>console.error(e));\n"
            "xs=[];\n"
            "data=[{x:xs,y:[],type:'scatter',name:'CO<sub>2</sub>',line:{color:'#2ca02c'}},\n"
            "{x:xs,y:[],type:'scatter',name:'Temperature',yaxis:'y2',line:{color:'#ff7f0e',dash:'dot'}},\n"
            "{x:xs,y:[],type:'scatter',name:'Humidity',yaxis:'y3',line:{color:'#1f77b4',dash:'dot'}}];\n"
            "layout={height:600,title:'%s',legend:{xanchor:'right',x:0.2,y:1.0},\n"
            "xaxis:{domain:[0.0,0.85]},yaxis:{ticksuffix:'ppm',range:[0,2000],dtick:200},\n"
            "yaxis2:{overlaying:'y',side:'right',ticksuffix:'°C',position:0.9,anchor:'free',range:[0,30],dtick:3},\n"
            "yaxis3:{overlaying:'y',side:'right',ticksuffix:'%%',position:0.95,anchor:'free',range:[0,100],dtick:10}\n"
            "};\n"
            "function csvToTable(csvText) {\n"
            "csvText=csvText.trim();\n"
            "lines=csvText.split('\\n');\n"
            "table=document.createElement('table');\n"
            "table.className='pure-table-striped';\n"
            "n=lines.length;\n"
            "lines.forEach((line,i)=>{\n"
            "fields=line.split(';');\n"
            "xs.push(fields[0]);\n"
            "data[0]['y'].push(fields[1]);\n"
            "data[1]['y'].push(fields[2]);\n"
            "data[2]['y'].push(fields[3]);\n"
            "if(i>4 && i<n-12){if(i==5){fields=['...','...','...','...']}else{return;}}\n"
            "row=document.createElement('tr');\n"
            "fields.forEach((field,index)=>{\n"
            "cell=document.createElement(i<2?'th':'td');\n"
            "cell.appendChild(document.createTextNode(field));\n"
            "row.appendChild(cell);});\n"
            "table.appendChild(row);});\n"
            "return table;}\n"
            "function addLogTableToPage(table){document.getElementById('log').appendChild(table);}\n"
            "</script>\n"
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#endif
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            "</body>\n"
            "</html>");
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    // Web-server
    http.on("/", handleWebServerRoot);
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Basic webserver commands    
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    http.on("/command", handleWebServerCommand);
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CSV_WRITER -> AMPEL_CSV    
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#ifdef AMPEL_CSV
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    http.on(csv_writer::filename, handleWebServerCSV); //NOTE: csv_writer should have been initialized first.
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    http.on("/delete_csv", HTTP_POST, handleDeleteCSV);
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#endif
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    http.onNotFound(handlePageNotFound);
    http.begin();

    Serial.print(F("You can access this sensor via http://"));
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    Serial.print(ampel.sensorId);
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    Serial.print(F(".local (might be unstable) or http://"));
    Serial.println(WiFi.localIP());
  }

  // Allow access if http_user or http_password are empty, or if provided credentials match
  bool shouldBeAllowed() {
    return strcmp(config::http_user, "") == 0 || strcmp(config::http_password, "") == 0
        || http.authenticate(config::http_user, config::http_password);
  }

  void handleWebServerRoot() {
    if (!shouldBeAllowed()) {
      return http.requestAuthentication(DIGEST_AUTH);
    }

    unsigned long ss = seconds();
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    uint8_t dd = ss / 86400;
    ss -= dd * 86400;
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    unsigned int hh = ss / 3600;
    ss -= hh * 3600;
    uint8_t mm = ss / 60;
    ss -= mm * 60;

    //NOTE: Splitting in multiple parts in order to use less RAM
    char content[2000]; // Update if needed
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    // INFO - Header size : 1767 - Body size : 1991 - Script size : 1909
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Local ip as char[]    
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    snprintf_P(content, sizeof(content), header_template, sensor::co2, ampel.sensorId, wifi::local_ip
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#ifdef AMPEL_CSV
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        , csv_writer::filename
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#endif
        );
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    //    Serial.print(F("INFO - Header size : "));
    //    Serial.print(strlen(content));
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    http.setContentLength(CONTENT_LENGTH_UNKNOWN);
    http.send_P(200, PSTR("text/html"), content);

    // Body
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    snprintf_P(content, sizeof(content), body_template, ampel.sensorId, sensor::co2, sensor::temperature,
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        sensor::humidity, sensor::timestamp, config::measurement_timestep,
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#ifdef AMPEL_CSV
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        csv_writer::last_successful_write, config::csv_interval, csv_writer::getAvailableSpace() / 1024,
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#endif
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#ifdef AMPEL_MQTT
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        mqtt::connected ? "Yes" : "No", mqtt::last_successful_publish, config::mqtt_sending_interval,
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#endif
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LORAWAN -> AMPEL_LORAWAN    
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#if defined(AMPEL_LORAWAN) && defined(ESP32)
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Fixing lorawan config and refactor    
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        lorawan::connected ? "Yes" : "No", config::lorawan_frequency_plan, lorawan::last_transmission,
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        config::lorawan_sending_interval,
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#endif
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        config::temperature_offset, config::auto_calibrate_sensor ? "Yes" : "No", ampel.sensorId, ampel.sensorId,
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        wifi::local_ip, wifi::local_ip, ampel.macAddress, ESP.getFreeHeap(), esp_get_max_free_block_size(),
        ampel.max_loop_duration, ampel.board, ampel.version, dd, hh, mm, ss);
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    //    Serial.print(F(" - Body size : "));
    //    Serial.print(strlen(content));
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    http.sendContent(content);

    // Script
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    snprintf_P(content, sizeof(content), script_template
#ifdef AMPEL_CSV
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c strings everywhere.    
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        , csv_writer::filename, ampel.sensorId
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No access to Filesystem without AMPEL_CSV    
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#endif
        );
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web_server: disabled unused debug info.    
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    //    Serial.print(F(" - Script size : "));
    //    Serial.println(strlen(content));
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    http.sendContent(content);
  }
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#ifdef AMPEL_CSV
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  void handleWebServerCSV() {
    if (!shouldBeAllowed()) {
      return http.requestAuthentication(DIGEST_AUTH);
    }
    if (FS_LIB.exists(csv_writer::filename)) {
      fs::File csv_file = FS_LIB.open(csv_writer::filename, "r");
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No String anymore. :)    
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      char csv_size[10];
      snprintf(csv_size, sizeof(csv_size), "%d", csv_file.size());
      http.sendHeader("Content-Length", csv_size);
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      http.streamFile(csv_file, F("text/csv"));
      csv_file.close();
    } else {
      http.send(204, F("text/html"), F("No data available."));
    }
  }

  void handleDeleteCSV() {
    if (!shouldBeAllowed()) {
      return http.requestAuthentication(DIGEST_AUTH);
    }
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No String anymore. :)    
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    Serial.print(F("Removing CSV file..."));
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    FS_LIB.remove(csv_writer::filename);
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No String anymore. :)    
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    Serial.println(F(" Done!"));
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    http.sendHeader("Location", "/");
    http.send(303);
  }
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#endif
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Basic webserver commands    
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  void handleWebServerCommand() {
    if (!shouldBeAllowed()) {
      return http.requestAuthentication(DIGEST_AUTH);
    }
    http.sendHeader("Location", "/");
    http.send(303);
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Applying suggestions from code review    
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    sensor_console::execute(http.arg("send").c_str());
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Basic webserver commands    
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  }
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  void handlePageNotFound() {
    http.send(404, F("text/plain"), F("404: Not found"));
  }
}

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