/*!
 * \file cli_device.cpp
 *
 * \copyright Copyright (C) 2020 Christos Choutouridis <christos@choutouridis.net>
 *
 * <dl class=\"section copyright\"><dt>License</dt><dd>
 * The MIT License (MIT)
 *
 * 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.
 * </dd></dl>
 *
 */
#include <utl/dev/cli_device.h>
#include <gtest/gtest.h>

#include <utl/container/equeue.h>

#include <cstring>
#include <utility>
#include <type_traits>
#ifndef WIN_TRHEADS
#include <mutex>
#include <thread>
#else
#include <mingw.thread.h>
#include <mingw.mutex.h>
#endif

namespace test_cli_device {
   using namespace utl;

   // test settings
   constexpr size_t Size  = 128;
   using data_type        = char;

   // cli_device implementer mock. We simulate a BG95 ATmodem for that purpose
   template<size_t N>
   class BG95 : public cli_device<BG95<N>, N> {
	   using base_type = cli_device<BG95<N>, N>;
	   using Queue     = equeue<typename base_type::value_type, N, true>;

       public:
           enum class event {
               MQTT_DISCONNECT, MQTT_RXDATA
           };
       // simulated modem operation
       private:
           struct cmd_pair {
               const char *cmd;
               const char *resp;
           };
           struct event_pair {
               event e;
               const char* resp;
           };

           std::array<cmd_pair, 20> cmd_map = {{
                   {"",                                             ""},
                   {"ERROR",                                        "\r\nERROR\r\n"},
                   {"ATE0\r\n",                                     "\r\nATE0\r\nOK\r\n"},
                   {"AT\r\n",                                       "\r\nOK\r\n"},
                   {"AT+QCFG=\"nwscanseq\"\r\n",                    "\r\n+QCFG: \"nwscanseq\",020301\r\n"},
                   {"AT+QCFG=\"nwscanseq\",010302\r\n",             "\r\nOK\r\n"},
                   {"AT+CREG?\r\n",                                 "\r\n+CREG: 0,5\r\n\r\nOK\r\n"},
                   {"AT+CSQ\r\n",                                   "\r\n+CSQ: 19,99\r\n\r\nOK\r\n"},
                   {"AT+QNWINFO\r\n",                               "\r\n+QNWINFO: \"EDGE\",\"20201\",\"GSM 1800\",865\r\n\r\nOK\r\n"},
                   // Files
                   {"AT+QFLST\r\n",                                 "\r\n+QFLST: \"cacert.pem\",1220\r\n+QFLST: \"security/\",2\r\nOK\r\n"},
                   // MQTT config
                   {"AT+QSSLCFG=\"ignorelocaltime\",2,1\r\n",       "\r\nOK\r\n"},
                   {"AT+QSSLCFG=\"seclevel\",2,1\r\n",              "\r\nOK\r\n"},
                   {"AT+QSSLCFG=\"sslversion\",2,4\r\n",            "\r\nOK\r\n"},
                   {"AT+QSSLCFG=\"ciphersuite\",2\r\n",             "\r\n+QSSLCFG: \"ciphersuite\",2,0XFFFF\r\n\r\nOK\r\n"},
                   {"AT+QMTCFG=\"ssl\",0,1,2\r\n",                  "\r\nOK\r\n"},
                   {"AT+QMTCFG=\"keepalive\",0,3600\r\n",           "\r\nOK\r\n"},
                   // MQTT
                   {"AT+QMTOPEN=0,\"server.com\",8883\r\n",         "\r\nOK\r\n\r\n+QMTOPEN: 0,0\r\n"},
                   {"AT+QMTCONN=0,\"myID\",\"user\",\"pass\"\r\n",  "\r\nOK\r\n\r\n+QMTCONN: 0,0,0\r\n"},
                   {"AT+QMTSUB=0,1,\"/path/topic1\",2\r\n",         "\r\nOK\r\n\r\n+QMTSUB: 0,1,0,2\r\n"},
                   {"AT+QMTPUB=0,0,0,0,\"/path/topic2\",9\r\n",     "\r\n> \r\nOK\r\n\r\n+QMTPUB: 0,0,0\r\n"},
           }};
           std::array<event_pair, 2> event_map {{
                   {event::MQTT_DISCONNECT,     "\r\n+QMTSTAT: 0,1\r\n"},
                   {event::MQTT_RXDATA,         "\r\n+QMTRECV: 0,1,\"/path/topic1\",\"BR: hello to all of my subscribers\""}
           }};
           const char* cmd_responce (const char* cmd) {
               if (cmd != nullptr) {
                   for (auto& it : cmd_map) {
                       if (!std::strcmp(it.cmd, cmd))
                           return it.resp;
                   }
               }
               return cmd_map[1].resp;
           }
           const char* event_responce (const event e) {
               for (auto& it : event_map) {
                   if (e == it.e)
                       return it.resp;
               }
               return nullptr;  // non reachable
           }

           // data
           Queue RxQ{};
           std::atomic<size_t> lines{};
           clock_t t=0;

       public:
           // cli_device driver requirements
           BG95() noexcept :
               RxQ(Queue::data_match::MATCH_PUSH, base_type::delimiter, [&](){
                   lines.fetch_add(1, std::memory_order_acq_rel);
               }), lines(0) { }

           size_t get(char* data, bool wait =false) {
               do {
                   if (lines.load(std::memory_order_acquire)) {
                       size_t n =0;
                       do{
                           *data << RxQ;
                           ++n;
                       } while (*data++ != base_type::delimiter);
                       lines.fetch_sub(1, std::memory_order_acq_rel);
                       return n;
                   }
               } while (wait);
               return 0;
           }
           size_t contents(char* data) {
               char* nullpos = std::copy(RxQ.begin(), RxQ.end(), data);
               *nullpos =0;
               return nullpos - data;
           }
           size_t put (const char* data, size_t n) {
               const char* reply = cmd_responce (data);
               while (*reply)
                   RxQ << *reply++;
               return n;
           }

           clock_t clock() noexcept { return ++t; }
           void clear_clock() noexcept { t=0; }

           // extra helper for testing purposes
           void async (event e) {
               const char* reply =event_responce (e);
               while (*reply)
                   RxQ << *reply++;
           }
   };

   // Behavior flag
   bool handler_flag = false;
   void handler (const char* data, size_t n) {
       (void)*data;
       (void)n;
       handler_flag = true;
   }
   void clear_flag () {
       handler_flag = false;
   }

   TEST(Tcli_device, traits) {
       EXPECT_EQ ( std::is_default_constructible<BG95<Size>>::value, true);
       EXPECT_EQ ( std::is_nothrow_default_constructible<BG95<Size>>::value, true);
       EXPECT_EQ (!std::is_copy_constructible<BG95<Size>>::value, true);
       EXPECT_EQ (!std::is_copy_assignable<BG95<Size>>::value, true);

       EXPECT_EQ ((std::is_same_v<BG95<Size>::value_type, data_type>), true);
       EXPECT_EQ ((std::is_same_v<BG95<Size>::pointer_type, data_type*>), true);
       EXPECT_EQ ((std::is_same_v<BG95<Size>::size_type, size_t>), true);
       EXPECT_EQ ((std::is_same_v<BG95<Size>::string_view, std::basic_string_view<data_type>>), true);

   }

   /*
    * Test inetd in non blocking mode
    */
   TEST(Tcli_device, txrx_inetd) {
       BG95<Size> modem;
       char buffer[Size];
       size_t s =0;

       const BG95<Size>::inetd_handlers<2> async = {{
           {"+QMTSTAT:", BG95<Size>::starts_with, handler},
           {"+QMTRECV",  BG95<Size>::contains,    handler},
       }};

       s = modem.transmit("", std::strlen(""));
       EXPECT_EQ (s, 0UL);
       s = modem.transmit("");
       EXPECT_EQ (s, 0UL);
       s = modem.transmit(nullptr);
       EXPECT_EQ (s, 0UL);

       clear_flag();
       modem.inetd(false, &async);
       EXPECT_EQ (handler_flag, false);
       modem.async(BG95<Size>::event::MQTT_DISCONNECT);
       modem.inetd(false, &async);     // parse "\r\n"
       EXPECT_EQ (handler_flag, false);
       modem.inetd(false, &async);      // parse "+QMT*\r\n"  and dispatch to handler()
       EXPECT_EQ (handler_flag, true);
       clear_flag();                    // nothing to parse
       modem.inetd(false, &async);
       modem.inetd(false, &async);
       modem.inetd(false, &async);
       EXPECT_EQ (handler_flag, false);
       EXPECT_NE (modem.receive(buffer), 0UL);  // "\r\n" in buffer
       EXPECT_EQ (std::strcmp(buffer, "\r\n"), 0);

       clear_flag();
       modem.inetd(false, &async);
       EXPECT_EQ (handler_flag, false);
       modem.transmit("AT+CSQ\r\n", 8);
       EXPECT_EQ (modem.receive(buffer), 0UL);
       modem.inetd(false, &async);      // parse "\r\n"
       EXPECT_NE (modem.receive(buffer), 0UL);
       EXPECT_EQ (std::strcmp(buffer, "\r\n"), 0);
       modem.inetd(false, &async);      // parse "+CSQ: 19,99\r\n"
       EXPECT_NE (modem.receive(buffer), 0UL);
       EXPECT_EQ (std::strcmp(buffer, "+CSQ: 19,99\r\n"), 0);
       modem.inetd(false, &async);      // parse "\r\n"
       EXPECT_NE (modem.receive(buffer), 0UL);
       EXPECT_EQ (std::strcmp(buffer, "\r\n"), 0);
       modem.inetd(false, &async);      // parse "OK\r\n"
       EXPECT_NE (modem.receive(buffer), 0UL);
       EXPECT_EQ (std::strcmp(buffer, "OK\r\n"), 0);
       modem.inetd(false, &async);      // nothing to parse
       modem.inetd(false, &async);
       modem.inetd(false, &async);
       EXPECT_EQ (modem.receive(buffer), 0UL);
   }

   TEST(Tcli_device, run) {
       BG95<Size> modem;

       using Control = BG95<Size>::control_t;

       const BG95<Size>::script_t<4> script = {{
           {Control::NOP,      "",          BG95<Size>::nil,         BG95<Size>::nil,  BG95<Size>::go_to<1>,   100000},
           {Control::SEND,     "ATE0\r\n",  BG95<Size>::nil,         BG95<Size>::nil,  BG95<Size>::next,       0},
           {Control::EXPECT,   "OK\r\n",    BG95<Size>::ends_with,   BG95<Size>::nil,  BG95<Size>::exit_ok,    100000},
           {Control::OR_EXPECT,"ERROR",     BG95<Size>::contains,    BG95<Size>::nil,  BG95<Size>::exit_error, 0}
       }};

       std::mutex m;
       m.lock();
       std::thread th1 ([&](){
           do
               modem.inetd(false);
           while (!m.try_lock());
           m.unlock();
       });
       EXPECT_EQ (modem.run(script), BG95<Size>::exit_ok.value);
       m.unlock();    // stop and join inetd
       th1.join();
   }

   TEST(Tcli_device, clear_size) {
       BG95<Size> modem;
       char buffer[Size];

       modem.clear();
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (modem.receive(buffer), 0UL);

       modem.transmit("abcd", 4);
       modem.inetd(false);
       modem.inetd(false);
       EXPECT_NE (modem.size(), 0UL);
       modem.clear();
       EXPECT_EQ (modem.size(), 0UL);

   }

   TEST(Tcli_device, command_non_extraction) {
       BG95<Size> modem;
       char buffer[Size];

       std::mutex m;
       m.lock();
       std::thread th1 ([&](){
           do
               modem.inetd(false);
           while (!m.try_lock());
           m.unlock();
       });

       auto run_receive = [&](size_t times) -> size_t {
           size_t s =0;
           for (size_t i=0 ; i<times ; ++i)
               s += modem.receive(buffer);
           return s;
       };

       EXPECT_EQ (modem.command("", "", 0), true);          // returns: ""
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       EXPECT_EQ (modem.command("", "abcd", 100000), false);// returns: ""
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       EXPECT_EQ (modem.command("abcd", "", 0), true);      // returns: "\r\nERROR\r\n"
       EXPECT_GT (run_receive(100000), 0UL);

       EXPECT_EQ (modem.command("AT\r\n", "Something else", 100000), false);// returns: "\r\nOK\r\n"
       EXPECT_GT (run_receive(100000), 0UL);

       EXPECT_EQ (modem.command("AT\r\n", "\r\nOK\r\n", 100000), true);     // returns: "\r\nOK\r\n"
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       EXPECT_EQ (modem.command("AT\r\n", "%OK\r\n", 100000), true);        // returns: "\r\nOK\r\n"
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       // returns: "\r\n+CREG: 0,5\r\n\r\nOK\r\n
       EXPECT_EQ (modem.command<BG95<Size>::flush>("AT+CREG?\r\n", "%OK\r\n", 0), false);
       EXPECT_GT (run_receive(100000), 0UL);

       // returns: "\r\n+CREG: 0,5\r\n\r\nOK\r\n
       EXPECT_EQ (modem.command<BG95<Size>::flush>("AT+CREG?\r\n", "%%%OK\r\n", 0), true);
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       // returns: "\r\n+CREG: 0,5\r\n\r\nOK\r\n
       EXPECT_EQ (modem.command<BG95<Size>::flush>("AT+CREG?\r\n", "%", 0), true);
       EXPECT_GT (run_receive(100000), 0UL);

       EXPECT_EQ (modem.command<BG95<Size>::flush>("AT\r\n", "%%", 0), true);   // returns: "\r\nOK\r\n"
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       EXPECT_EQ (modem.command<BG95<Size>::flush>("AT\r\n", "%%%", 10000), false); // returns: "\r\nOK\r\n"
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       // returns: "\r\n+CREG: 0,5\r\n\r\nOK\r\n
       EXPECT_EQ (modem.command<modem.flush>("AT+CREG?\r\n", "", 0), true);
       EXPECT_EQ (modem.command<modem.keep>("", "%", 0), true);
       EXPECT_EQ (modem.command<modem.keep>("", "%%", 0), true);
       EXPECT_EQ (modem.command<modem.keep>("", "%", 0), true);
       EXPECT_EQ (modem.command<modem.keep>("", "%", 10000), false);
       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       m.unlock();    // stop and join inetd
       th1.join();
   }

   TEST(Tcli_device, command_extraction) {
       BG95<Size> modem;
       char buffer[Size];

       std::mutex m;
       m.lock();
       std::thread th1 ([&](){
           do
               modem.inetd(false);
           while (!m.try_lock());
           m.unlock();
       });

       auto run_receive = [&](size_t times) -> size_t {
           size_t s =0;
           for (size_t i=0 ; i<times ; ++i)
               s += modem.receive(buffer);
           return s;
       };

       int status1, status2;
       EXPECT_EQ (modem.command("AT+CREG?\r\n", "\r\n+CREG: 0,%\r\n\r\nOK\r\n", 100000, &status1), true);
       EXPECT_EQ (status1, 5);
       EXPECT_EQ (modem.command("AT+CREG?\r\n", "\r\n+CREG: %,%\r\n\r\nOK\r\n", 100000, &status1, &status2), true);
       EXPECT_EQ (status1, 0);
       EXPECT_EQ (status2, 5);

       char substr1[32], substr2[32];
       EXPECT_EQ (modem.command("AT+CREG?\r\n", "\r\n%\r\n\r\n%\r\n", 100000, substr1, substr2), true);
       EXPECT_EQ (std::strcmp("+CREG: 0,5", substr1), 0);
       EXPECT_EQ (std::strcmp("OK", substr2), 0);

       // returns: "\r\n+CREG: 0,5\r\n\r\nOK\r\n
       EXPECT_EQ (modem.command<modem.flush>("AT+CREG?\r\n", "", 100000), true);
       EXPECT_EQ (modem.command<modem.keep>("", "%", 100000, substr1), true);
       EXPECT_EQ (std::strcmp("\r\n", substr1), 0);

       EXPECT_EQ (modem.command<modem.keep>("", "%%", 100000, substr1, substr2), true);
       EXPECT_EQ (std::strcmp("+CREG: 0,5\r\n", substr1), 0);
       EXPECT_EQ (std::strcmp("\r\n", substr2), 0);

       EXPECT_EQ (modem.command<modem.keep>("", "%", 100000, substr1), true);
       EXPECT_EQ (std::strcmp("OK\r\n", substr1), 0);

       EXPECT_EQ (modem.command<modem.keep>("", "%", 10000), false);

       EXPECT_EQ (modem.size(), 0UL);
       EXPECT_EQ (run_receive(100000), 0UL);

       m.unlock();    // stop and join inetd
       th1.join();

   }
}