/*
 * Copyright (c) 2020 Siddharth Chandrasekaran <siddharth@embedjournal.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef _OSDP_H_
#define _OSDP_H_

#include <zephyr/kernel.h>
#include <stdint.h>

#include <zephyr/sys/slist.h>

#ifdef __cplusplus
extern "C" {
#endif

#define OSDP_CMD_TEXT_MAX_LEN          32
#define OSDP_CMD_KEYSET_KEY_MAX_LEN    32

/**
 * @brief Various card formats that a PD can support. This is sent to CP
 * when a PD must report a card read.
 */
enum osdp_card_formats_e {
	OSDP_CARD_FMT_RAW_UNSPECIFIED,
	OSDP_CARD_FMT_RAW_WIEGAND,
	OSDP_CARD_FMT_ASCII,
	OSDP_CARD_FMT_SENTINEL
};

/**
 * @brief Command sent from CP to Control digital output of PD.
 *
 * @param output_no 0 = First Output, 1 = Second Output, etc.
 * @param control_code One of the following:
 *   0 - NOP – do not alter this output
 *   1 - set the permanent state to OFF, abort timed operation (if any)
 *   2 - set the permanent state to ON, abort timed operation (if any)
 *   3 - set the permanent state to OFF, allow timed operation to complete
 *   4 - set the permanent state to ON, allow timed operation to complete
 *   5 - set the temporary state to ON, resume perm state on timeout
 *   6 - set the temporary state to OFF, resume permanent state on timeout
 * @param timer_count Time in units of 100 ms
 */
struct osdp_cmd_output {
	uint8_t output_no;
	uint8_t control_code;
	uint16_t timer_count;
};

/**
 * @brief LED Colors as specified in OSDP for the on_color/off_color parameters.
 */
enum osdp_led_color_e {
	OSDP_LED_COLOR_NONE,
	OSDP_LED_COLOR_RED,
	OSDP_LED_COLOR_GREEN,
	OSDP_LED_COLOR_AMBER,
	OSDP_LED_COLOR_BLUE,
	OSDP_LED_COLOR_SENTINEL
};

/**
 * @brief LED params sub-structure. Part of LED command. See struct osdp_cmd_led
 *
 * @param control_code One of the following:
 * Temporary Control Code:
 *   0 - NOP - do not alter this LED's temporary settings
 *   1 - Cancel any temporary operation and display this LED's permanent state
 *       immediately
 *   2 - Set the temporary state as given and start timer immediately
 * Permanent Control Code:
 *   0 - NOP - do not alter this LED's permanent settings
 *   1 - Set the permanent state as given
 * @param on_count The ON duration of the flash, in units of 100 ms
 * @param off_count The OFF duration of the flash, in units of 100 ms
 * @param on_color Color to set during the ON timer (enum osdp_led_color_e)
 * @param off_color Color to set during the OFF timer (enum osdp_led_color_e)
 * @param timer_count Time in units of 100 ms (only for temporary mode)
 */
struct osdp_cmd_led_params {
	uint8_t control_code;
	uint8_t on_count;
	uint8_t off_count;
	uint8_t on_color;
	uint8_t off_color;
	uint16_t timer_count;
};

/**
 * @brief Sent from CP to PD to control the behaviour of it's on-board LEDs
 *
 * @param reader 0 = First Reader, 1 = Second Reader, etc.
 * @param led_number 0 = first LED, 1 = second LED, etc.
 * @param temporary ephemeral LED status descriptor
 * @param permanent permanent LED status descriptor
 */
struct osdp_cmd_led {
	uint8_t reader;
	uint8_t led_number;
	struct osdp_cmd_led_params temporary;
	struct osdp_cmd_led_params permanent;
};

/**
 * @brief Sent from CP to control the behaviour of a buzzer in the PD.
 *
 * @param reader 0 = First Reader, 1 = Second Reader, etc.
 * @param control_code 0: no tone, 1: off, 2: default tone, 3+ is TBD.
 * @param on_count The ON duration of the flash, in units of 100 ms
 * @param off_count The OFF duration of the flash, in units of 100 ms
 * @param rep_count The number of times to repeat the ON/OFF cycle; 0: forever
 */
struct osdp_cmd_buzzer {
	uint8_t reader;
	uint8_t control_code;
	uint8_t on_count;
	uint8_t off_count;
	uint8_t rep_count;
};

/**
 * @brief Command to manipulate any display units that the PD supports.
 *
 * @param reader 0 = First Reader, 1 = Second Reader, etc.
 * @param control_code One of the following:
 *   1 - permanent text, no wrap
 *   2 - permanent text, with wrap
 *   3 - temp text, no wrap
 *   4 - temp text, with wrap
 * @param temp_time duration to display temporary text, in seconds
 * @param offset_row row to display the first character (1 indexed)
 * @param offset_col column to display the first character (1 indexed)
 * @param length Number of characters in the string
 * @param data The string to display
 */
struct osdp_cmd_text {
	uint8_t reader;
	uint8_t control_code;
	uint8_t temp_time;
	uint8_t offset_row;
	uint8_t offset_col;
	uint8_t length;
	uint8_t data[OSDP_CMD_TEXT_MAX_LEN];
};

/**
 * @brief Sent in response to a COMSET command. Set communication parameters to
 * PD. Must be stored in PD non-volatile memory.
 *
 * @param address Unit ID to which this PD will respond after the change takes
 *             effect.
 * @param baud_rate baud rate value 9600/38400/115200
 */
struct osdp_cmd_comset {
	uint8_t address;
	uint32_t baud_rate;
};

/**
 * @brief This command transfers an encryption key from the CP to a PD.
 *
 * @param type Type of keys:
 *   - 0x01 – Secure Channel Base Key
 * @param length Number of bytes of key data - (Key Length in bits + 7) / 8
 * @param data Key data
 */
struct osdp_cmd_keyset {
	uint8_t type;
	uint8_t length;
	uint8_t data[OSDP_CMD_KEYSET_KEY_MAX_LEN];
};

/**
 * @brief OSDP application exposed commands
 */
enum osdp_cmd_e {
	OSDP_CMD_OUTPUT = 1,
	OSDP_CMD_LED,
	OSDP_CMD_BUZZER,
	OSDP_CMD_TEXT,
	OSDP_CMD_KEYSET,
	OSDP_CMD_COMSET,
	OSDP_CMD_SENTINEL
};

/**
 * @brief OSDP Command Structure. This is a wrapper for all individual OSDP
 * commands.
 *
 * @param id used to select specific commands in union. Type: enum osdp_cmd_e
 * @param led LED command structure
 * @param buzzer buzzer command structure
 * @param text text command structure
 * @param output output command structure
 * @param comset comset command structure
 * @param keyset keyset command structure
 */
struct osdp_cmd {
	sys_snode_t node;
	enum osdp_cmd_e id;
	union {
		struct osdp_cmd_led    led;
		struct osdp_cmd_buzzer buzzer;
		struct osdp_cmd_text   text;
		struct osdp_cmd_output output;
		struct osdp_cmd_comset comset;
		struct osdp_cmd_keyset keyset;
	};
};

#ifdef CONFIG_OSDP_MODE_PD

/**
 * @param cmd pointer to a command structure that was received by the driver.
 *
 * @retval 0 on success.
 * @retval -1 on failure.
 */
int osdp_pd_get_cmd(struct osdp_cmd *cmd);

#else /* CONFIG_OSDP_MODE_PD */

int osdp_cp_set_callback_key_press(
	int (*cb)(int address, uint8_t key));
int osdp_cp_set_callback_card_read(
	int (*cb)(int address, int format, uint8_t *data, int len));
int osdp_cp_send_command(int pd, struct osdp_cmd *cmd);

#endif /* CONFIG_OSDP_MODE_PD */

#ifdef CONFIG_OSDP_SC_ENABLED

uint32_t osdp_get_sc_status_mask(void);

#endif

#ifdef __cplusplus
}
#endif

#endif	/* _OSDP_H_ */