/*
 * MIT License
 *
 * Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
 *
 * 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.
 */

/**
 * @file shellmatta.h
 * @brief API definition of the Shellmatta terminal implementation
 * @author Stefan Strobel <stefan.strobel@shimatta.net>
 */

/**
 * @addtogroup shellmatta
 * @{
 */

#ifndef _SHELLMATTA_H_
#define _SHELLMATTA_H_

#include <stdint.h>
#include <stdbool.h>

/**
 * @brief definition of shellmatta return codes
 */
typedef enum
{
    SHELLMATTA_OK           = 0u,   /**< everything is OK               */
    SHELLMATTA_ERROR            ,   /**< error occured                  */
    SHELLMATTA_CONTINUE         ,   /**< the function is not over       */
    SHELLMATTA_USE_FAULT        ,   /**< parameter error - wrong usage  */
    SHELLMATTA_DUPLICATE            /**< duplicate command              */
} shellmatta_retCode_t;

/**
 * @brief definition of shellmatta insert mode
 */
typedef enum
{
    SHELLMATTA_MODE_INSERT      = 0u,   /**< insert mode    */
    SHELLMATTA_MODE_OVERWRITE   ,       /**< overwrite mode */
} shellmatta_mode_t;

/**
 * @brief shellmatta command function definition
 */
typedef shellmatta_retCode_t (*shellmatta_cmdFct_t)(int argc, char *argv[]);

/**
 * @brief shellmatta write function definition
 */
typedef shellmatta_retCode_t (*shellmatta_write_t)(const char* data, uint32_t length);

/**
 * @brief structure of one shellmatta command
 */
typedef struct shellmatta_cmd
{
    char                    *cmd;       /**< command name                           */
    char                    *cmdAlias;  /**< command alias                          */
    char                    *helpText;  /**< help text to print in "help" command   */
    char                    *usageText; /**< usage text to print on parameter error */
    shellmatta_cmdFct_t     cmdFct;     /**< pointer to the cmd callack function    */
    struct shellmatta_cmd   *next;      /**< pointer to next command or NULL        */
} shellmatta_cmd_t;

/**
 * @brief structure of one shellmatta instance
 */
typedef struct
{
    uint8_t             *buffer;            /**< input buffer                           */
    uint32_t            bufferSize;         /**< size of the input buffer               */
    uint32_t            inputCount;         /**< offset of the current write operation  */
    uint32_t            cursor;             /**< offset where the cursor is at          */
    uint8_t             *historyBuffer;     /**< buffer to store the last commands      */
    uint32_t            historyBufferSize;  /**< size of the history buffer             */
    uint32_t            historyStart;       /**< index of the oldest stored command     */
    uint32_t            historyEnd;         /**< index of the newest stored command     */
    uint32_t            historyRead;        /**< index of the current search            */
    bool                historyReadUp;      /**< flag to show the last history dir      */
    uint32_t            tabCounter;         /**< counts the tabulator key presses       */
    uint32_t            escapeCounter;      /**< counts the characters of an escape seq */
    uint8_t             escapeChars[4];     /**< buffer to save the escape characters   */
    bool                echoEnabled;        /**< if true the input is printed           */
    bool                dirty;              /**< dirty flag to show changes             */
    const char          *prompt;            /**< prompt is printed after every command  */
    shellmatta_mode_t   mode;               /**< mode of the shell                      */
    shellmatta_write_t  write;              /**< pointer to write function              */
    shellmatta_cmd_t    *cmdList;           /**< pointer to the first command           */
} shellmatta_instance_t;

shellmatta_retCode_t shellmatta_doInit( shellmatta_instance_t   *inst,
                        uint8_t                 *buffer,
                        uint32_t                bufferSize,
                        uint8_t                 *historyBuffer,
                        uint32_t                historyBufferSize,
                        const char              *prompt,
                        shellmatta_write_t      writeFct);
shellmatta_retCode_t shellmatta_addCmd(shellmatta_instance_t *inst, shellmatta_cmd_t *cmd);
void shellmatta_doTask(shellmatta_instance_t *inst, uint32_t time);
void shellmatta_processData(shellmatta_instance_t *inst, char *data, uint32_t size);
void shellmatta_printf(shellmatta_instance_t *inst, const char *fmt, ...);
void shellmatta_getArg(uint32_t cnt, uint8_t *arg);

#endif

/** @} */