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/* Copyright (c) 2015 ARM Limited
 *
 * 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.
 *
 * @section DESCRIPTION
 *
 * Parser for the AT command syntax
 *
 */
#ifndef AT_PARSER_H
#define AT_PARSER_H

#include "mbed.h"
#include <cstdarg>
#include <vector>
#include "BufferedSpi.h"
#include "Callback.h"

#define DEFAULT_SPI_TIMEOUT 60000 /* 1 minute */

/**
* Parser class for parsing AT commands
*
* Here are some examples:
* @code
* ATParser at = ATParser(serial, "\r\n");
* int value;
* char buffer[100];
*
* at.send("AT") && at.recv("OK");
* at.send("AT+CWMODE=%d", 3) && at.recv("OK");
* at.send("AT+CWMODE?") && at.recv("+CWMODE:%d\r\nOK", &value);
* at.recv("+IPD,%d:", &value);
* at.read(buffer, value);
* at.recv("OK");
* @endcode
*/
class ATParser {
private:
    // Serial information
    BufferedSpi *_serial_spi;
    int _buffer_size;
    char *_buffer;
    Mutex _bufferMutex;

    // Parsing information
    const char *_delimiter;
    int _delim_size;
    char _in_prev;
    volatile bool _aborted;

    struct oob {
        unsigned len;
        const char *prefix;
        mbed::Callback<void()> cb;
        oob *next;
    };
    oob *_oobs;

public:
    /**
    * Constructor
    *
    * @param serial spi interface to use for AT commands
    * @param buffer_size size of internal buffer for transaction
    * @param timeout timeout of the connection
    * @param delimiter string of characters to use as line delimiters
    */
    ATParser(BufferedSpi &serial_spi, const char *delimiter = "\r\n", int buffer_size = 1440, int timeout = DEFAULT_SPI_TIMEOUT);

    /**
    * Destructor
    */
    ~ATParser()
    {
        while (_oobs) {
            struct oob *oob = _oobs;
            _oobs = oob->next;
            delete oob;
        }
        delete[] _buffer;
    }

    /**
    * Allows timeout to be changed between commands
    *
    * @param timeout timeout of the connection
    */
    void setTimeout(int timeout)
    {
        _serial_spi->setTimeout(timeout);
    }

    /**
    * Sets string of characters to use as line delimiters
    *
    * @param delimiter string of characters to use as line delimiters
    */
    void setDelimiter(const char *delimiter)
    {
        _delimiter = delimiter;
        _delim_size = strlen(delimiter);
    }

    /**
     * Sends an AT command
     *
     * Sends a formatted command using printf style formatting
     * @see printf
     *
     * @param command printf-like format string of command to send which
     *                is appended with a newline
     * @param ... all printf-like arguments to insert into command
     * @return true only if command is successfully sent
     */
    bool send(const char *command, ...);

    bool vsend(const char *command, va_list args);

    /**
     * Receive an AT response
     *
     * Receives a formatted response using scanf style formatting
     * @see scanf
     *
     * Responses are parsed line at a time.
     * Any received data that does not match the response is ignored until
     * a timeout occurs.
     *
     * @param response scanf-like format string of response to expect
     * @param ... all scanf-like arguments to extract from response
     * @return true only if response is successfully matched
     */
    bool recv(const char *response, ...);
    bool vrecv(const char *response, va_list args);


    /**
     * Write a single byte to the underlying stream
     *
     * @param c The byte to write
     * @return The byte that was written or -1 during a timeout
     */
    int putc(char c);

    /**
     * Get a single byte from the underlying stream
     *
     * @return The byte that was read or -1 during a timeout
     */
    int getc();

    /**
     * Write an array of bytes to the underlying stream
     * assuming the header of the command is already in _txbuffer
     *
     * @param data the array of bytes to write
     * @param size_of_data number of bytes in data array
     * @param size_in_buff number of bytes already in the internal buff
     * @return number of bytes written or -1 on failure
     */
    int write(const char *data, int size_of_data, int size_in_buff);

    /**
     * Read an array of bytes from the underlying stream
     *
     * @param data the destination for the read bytes
     * @param size number of bytes to read
     * @return number of bytes read or -1 on failure
     */
    int read(char *data);

    /**
     * Direct printf to underlying stream
     * @see printf
     *
     * @param format format string to pass to printf
     * @param ... arguments to printf
     * @return number of bytes written or -1 on failure
     */
    int printf(const char *format, ...);
    int vprintf(const char *format, va_list args);

    /**
    * Direct scanf on underlying stream
    * @see ::scanf
    *
    * @param format format string to pass to scanf
    * @param ... arguments to scanf
    * @return number of bytes read or -1 on failure
    */
    int scanf(const char *format, ...);

    int vscanf(const char *format, va_list args);

    /**
     * Attach a callback for out-of-band data
     *
     * @param prefix string on when to initiate callback
     * @param func callback to call when string is read
     * @note out-of-band data is only processed during a scanf call
     */
    void oob(const char *prefix, mbed::Callback<void()> func);

    /**
     * Flushes the underlying stream
     */
    void flush();

    /**
     * Abort current recv
     *
     * Can be called from oob handler to interrupt the current
     * recv operation.
     */
    void abort();

    /**
    * Process out-of-band data
    *
    * Process out-of-band data in the receive buffer. This function
    * returns immediately if there is no data to process.
    *
    * @return true if oob data processed, false otherwise
    */
    bool process_oob(void);
    /**
    * Get buffer_size
    */
    int get_size(void)
    {
        return _buffer_size;
    }

};
#endif