// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <unistd.h>

#include "cxx_include/esp_modem_dte.hpp"
#include "cxx_include/esp_modem_dce.hpp"
#include "esp_log.h"

namespace esp_modem {


bool DCE_Mode::set(DTE *dte, ModuleIf *device, Netif &netif, modem_mode m)
{
    switch (m) {
    case modem_mode::UNDEF:
        break;
    case modem_mode::COMMAND_MODE:
        if (mode == modem_mode::COMMAND_MODE) {
            return false;
        }
        netif.stop();
        if (!device->set_mode(modem_mode::COMMAND_MODE)) {
            return false;
        }
        dte->set_read_cb([&](uint8_t *data, size_t len) -> bool {
            ESP_LOG_BUFFER_HEXDUMP("esp-modem: debug_data", data, len, ESP_LOG_INFO);
            return false;
        });
        netif.wait_until_ppp_exits();
        dte->set_read_cb(nullptr);
        if (!dte->set_mode(modem_mode::COMMAND_MODE)) {
            return false;
        }
        mode = m;
        return true;
    case modem_mode::DATA_MODE:
        if (mode == modem_mode::DATA_MODE) {
            return false;
        }
        if (!device->setup_data_mode()) {
            return false;
        }
        if (!device->set_mode(modem_mode::DATA_MODE)) {
            return false;
        }
        if (!dte->set_mode(modem_mode::DATA_MODE)) {
            return false;
        }
        netif.start();
        mode = m;
        return true;
    case modem_mode::CMUX_MODE:
        if (mode == modem_mode::DATA_MODE || mode == modem_mode::CMUX_MODE) {
            return false;
        }
        device->set_mode(modem_mode::CMUX_MODE);    // switch the device into CMUX mode
        usleep(100'000);                            // some devices need a few ms to switch

        if (!dte->set_mode(modem_mode::CMUX_MODE)) {
            return false;
        }
        mode = modem_mode::COMMAND_MODE;
        return true;
    }
    return false;
}

modem_mode DCE_Mode::get()
{
    return mode;
}

} // esp_modem