/**************************************************************
 * WiFiManager is a library for the ESP8266/Arduino platform
 * (https://github.com/esp8266/Arduino) to enable easy 
 * configuration and reconfiguration of WiFi credentials and 
 * store them in EEPROM.
 * inspired by http://www.esp8266.com/viewtopic.php?f=29&t=2520
 * https://github.com/chriscook8/esp-arduino-apboot 
 * Built by AlexT https://github.com/tzapu
 * Licensed under MIT license
 **************************************************************/

#ifndef WiFiManager_h
#define WiFiManager_h

#include <ESP8266WiFi.h>

#include <EEPROM.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <DNSServer.h>


class WiFiManager
{
public:
    WiFiManager();
    
    void    begin();
    void    begin(char const *apName);
    
    boolean autoConnect();
    boolean autoConnect(char const *apName);
    
    boolean hasConnected();
    
    String  beginConfigMode(void);
    void    startWebConfig();
    
    String  getSSID();
    String  getPassword();
    void    setSSID(String s);
    void    setPassword(String p);
    void    resetSettings();
    //for conveniennce
    String  urldecode(const char*);

    //sets timeout before webserver loop ends and exits even if there has been no setup. 
    //usefully for devices that failed to connect at some point and got stuck in a webserver loop
    //in seconds
    void    setTimeout(unsigned long seconds);
    void    setDebugOutput(boolean debug);

    //sets a custom ip /gateway /subnet configuration
    void    setAPConfig(IPAddress ip, IPAddress gw, IPAddress sn);
    
    int     serverLoop();

private:
    DNSServer dnsServer;
    ESP8266WebServer server;

    const int WM_DONE = 0;
    const int WM_WAIT = 10;
    
    const String HTTP_404 = "HTTP/1.1 404 Not Found\r\n\r\n";
    const String HTTP_200 = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n";
    const String HTTP_HEAD = "<!DOCTYPE html><html lang=\"en\"><head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"/><title>{v}</title>";
    const String HTTP_STYLE = "<style>div,input {margin-bottom: 5px;} body{width:200px;display:block;margin-left:auto;margin-right:auto;} button{padding:0.75rem 1rem;border:0;border-radius:0.317rem;background-color:#1fa3ec;color:#fff;line-height:1.5;cursor:pointer;}</style>";
    const String HTTP_SCRIPT = "<script>function c(l){document.getElementById('s').value=l.innerText||l.textContent;document.getElementById('p').focus();}</script>";
    const String HTTP_HEAD_END = "</head><body>";
    const String HTTP_ITEM = "<div><a href='#' onclick='c(this)'>{v}</a></div>";
    const String HTTP_FORM = "<form method='get' action='wifisave'><input id='s' name='s' length=32 placeholder='SSID'><input id='p' name='p' length=64 placeholder='password'><br/><button type='submit'>save</button></form>";
    const String HTTP_SAVED = "<div>Credentials Saved<br />Node will reboot in 5 seconds.</div>";
    const String HTTP_END = "</body></html>";
    //const char HTTP_END[] PROGMEM = R"=====(
    //</body></html>
    //)=====";
    
    int _eepromStart;
    const char* _apName = "no-net";
    String _ssid = "";
    String _pass = "";
    unsigned long timeout = 0;
    unsigned long start = 0;
    IPAddress _ip;
    IPAddress _gw;
    IPAddress _sn;
    
    String getEEPROMString(int start, int len);
    void setEEPROMString(int start, int len, String string);

    bool keepLooping = true;
    int status = WL_IDLE_STATUS;
    void connectWifi(String ssid, String pass);

    void handleRoot();
    void handleWifi(bool scan);
    void handleWifiSave();
    void handleNotFound();
    void handle204();
    boolean captivePortal();
    
    // DNS server
    const byte DNS_PORT = 53;
    
    boolean isIp(String str);
    String toStringIp(IPAddress ip);

    boolean connect;
    boolean _debug = true;

    template <typename Generic>
    void DEBUG_PRINT(Generic text);
};



#endif