#ifndef _OSMOCOM_SIM_H
#define _OSMOCOM_SIM_H

#include <osmocom/core/msgb.h>
#include <osmocom/core/linuxlist.h>

#define APDU_HDR_LEN	5

/*!
 * \file sim.h
 * \brief Routines for helping with SIM (ISO/IEC 7816-4 more generally) communication.
 */

/*! \brief command-response pairs cases
 *
 * Enumeration used to identify the APDU structure based on command-response pair case , as specified in ISO/IEC 7816-3:2006(E) §12.1.
 */
enum osim_apdu_case {
	APDU_CASE_1, /*!< command header, no command data field, no response data field */
	APDU_CASE_2S, /*!< command header, no command data field, response data field (short) */
	APDU_CASE_2E, /*!< command header, no command data field, response data field (extended) */
	APDU_CASE_3S, /*!< command header, command data field (short), no response data field */
	APDU_CASE_3E, /*!< command header, command data field (extended), no response data field */
	APDU_CASE_4S, /*!< command header, command data field (short), response data field (short) */
	APDU_CASE_4E /*!< command header, command data field (extended), response data field (extended) */
};

/*! \brief APDU/TPDU command header
 *
 * This structure encode an APDU/TPDU command header, as specified in ISO/IEC 7816-3:2006(E) §12.2 and §12.3.
 * The APDU (application layer) can be encoded as different TPDUs (transport layer), depending on the transport protocol used.
 * The TPDU encoding by T=1 of the APDU command header is identical to the APDU.
 * The TPDU encoding by T=0 of the APDU command header adds a Parameter 3 field, generally used instead of Lc/Le.
 * 
 * @todo have different structures for APDU, TPDU by T=0, and TPDU by T=1.
 */
struct osim_apdu_cmd_hdr {
	uint8_t cla; /*!< CLASS byte */
	uint8_t ins; /*!< INSTRUCTION byte */
	uint8_t p1; /*!< Parameter 1 byte */
	uint8_t p2; /*!< Parameter 2 byte */
	uint8_t p3; /*!< Parameter 3 byte, used for TPDU by T=0 */
} __attribute__ ((packed));

#define msgb_apdu_dr(__x)

/*! \brief APDU command body
 *
 * This structure encode a command body, as specified in ISO/IEC 7816-3:2006(E) §12.1.
 * The data and response contents should be provided along with this structure.
 */
struct osim_msgb_cb {
	enum osim_apdu_case apduc; /*!< command-response pair case, defining the encoding of Lc and Le */
	uint16_t lc; /*!< number of bytes in the command data field Nc, which will encoded in 0, 1 or 3 bytes into Lc, depending on the case */
	uint16_t le; /*!< maximum number of bytes expected in the response data field,  which will encoded in 0, 1, 2 or 3 bytes into Le, depending on the case */
	uint16_t sw; /*!< status word, composed of SW1 and SW2 bytes */
} __attribute__((__may_alias__));
#define OSIM_MSGB_CB(__msgb)	((struct osim_msgb_cb *)&((__msgb)->cb[0]))
/*! \brief status word from msgb->cb */
#define msgb_apdu_case(__x)	OSIM_MSGB_CB(__x)->apduc
#define msgb_apdu_lc(__x)	OSIM_MSGB_CB(__x)->lc
#define msgb_apdu_le(__x)	OSIM_MSGB_CB(__x)->le
#define msgb_apdu_sw(__x)	OSIM_MSGB_CB(__x)->sw
/*! \brief pointer to the command header of the APDU */
#define msgb_apdu_h(__x)	((struct osim_apdu_cmd_hdr *)(__x)->l2h)

#define msgb_apdu_dc(__x)	((__x)->l2h + sizeof(struct osim_apdu_cmd_hdr))
#define msgb_apdu_de(__x)	((__x)->l2h + sizeof(struct osim_apdu_cmd_hdr) + msgb_apdu_lc(__x))

struct osim_file;
struct osim_file_desc;
struct osim_decoded_data;

struct osim_file_ops {
	int (*parse)(struct osim_decoded_data *dd,
		     const struct osim_file_desc *desc,
		     int len, uint8_t *data);
	struct msgb * (*encode)(const struct osim_file *file,
				const struct osim_decoded_data *decoded);
};

enum osim_element_type {
	ELEM_T_NONE,
	ELEM_T_BOOL,	/*!< a boolean flag */
	ELEM_T_UINT8,	/*!< unsigned integer */
	ELEM_T_UINT16,	/*!< unsigned integer */
	ELEM_T_UINT32,	/*!< unsigned integer */
	ELEM_T_STRING,	/*!< generic string */
	ELEM_T_BCD,	/*!< BCD encoded digits */
	ELEM_T_BYTES,	/*!< BCD encoded digits */
	ELEM_T_GROUP,	/*!< group container, has siblings */
};

enum osim_element_repr {
	ELEM_REPR_NONE,
	ELEM_REPR_DEC,
	ELEM_REPR_HEX,
};

struct osim_decoded_element {
	struct llist_head list;

	enum osim_element_type type;
	enum osim_element_repr representation;
	const char *name;

	unsigned int length;
	union {
		uint8_t u8;
		uint16_t u16;
		uint32_t u32;
		uint8_t *buf;
		struct llist_head siblings;
	} u;
};

struct osim_decoded_data {
	/*! file to which we belong */
	const struct osim_file *file;
	/*! list of 'struct decoded_element' */
	struct llist_head decoded_elements;
};


enum osim_file_type {
	TYPE_NONE,
	TYPE_DF,
	TYPE_ADF,
	TYPE_EF,
	TYPE_EF_INT,
};

enum osim_ef_type {
	EF_TYPE_TRANSP,
	EF_TYPE_RECORD_FIXED,
	EF_TYPE_RECORD_CYCLIC,
};

#define F_OPTIONAL		0x0001

#define SFI_NONE 		0xFF

struct osim_file_desc {
	struct llist_head list;		/*!< local element in list */
	struct llist_head child_list;	/*!< list of children EF in DF */
	struct osim_file_desc *parent;	/*!< parent DF */

	enum osim_file_type type;
	enum osim_ef_type ef_type;

	uint16_t fid;			/*!< File Identifier */
	uint8_t sfid;			/*!< Short File IDentifier */
	const char *df_name;		
	uint8_t df_name_len;

	const char *short_name;		/*!< Short Name (like EF.ICCID) */
	const char *long_name;		/*!< Long / description */
	unsigned int flags;

	struct osim_file_ops ops;

	struct {
		size_t min;		/*!< Minimum size of the file
					  (transparent) or record in
					  cyclic / linear file */
		size_t rec;		/*!< Recommended size */
	} size;
};

struct osim_file {
	const struct osim_file_desc *desc;

	struct msgb *encoded_data;
	struct osim_decoded_data *decoded_data;
};

#define EF(pfid, sfi, pns, pflags, pnl, ptype, smin, srec, pdec, penc)	\
	{								\
		.fid		= pfid,					\
		.sfid		= sfi,					\
		.type		= TYPE_EF,				\
		.ef_type	= ptype,				\
		.short_name	= pns,					\
		.long_name	= pnl,					\
		.flags		= pflags,				\
		.ops 		= { .encode = penc, .parse = pdec },	\
		.size		= { .min = smin, .rec = srec},		\
	}


#define EF_TRANSP(fid, sfi, ns, flags, smin, srec, nl, dec, enc)	\
		EF(fid, sfi, ns, flags, nl, EF_TYPE_TRANSP,		\
		   smin, srec, dec, enc)
#define EF_TRANSP_N(fid, sfi, ns, flags, smin, srec, nl)		\
		EF_TRANSP(fid, sfi, ns, flags, smin, srec,		\
			  nl, &default_decode, NULL)

#define EF_CYCLIC(fid, sfi, ns, flags, smin, srec, nl, dec, enc)	\
		EF(fid, sfi, ns, flags, nl, EF_TYPE_RECORD_CYCLIC,	\
		   smin, srec, dec, enc)
#define EF_CYCLIC_N(fid, sfi, ns, flags, smin, srec, nl)		\
		EF_CYCLIC(fid, sfi, ns, flags, smin, srec, nl,		\
			  &default_decode, NULL)

#define EF_LIN_FIX(fid, sfi, ns, flags, smin, srec, nl, dec, enc)	\
		EF(fid, sfi, ns, flags, nl, EF_TYPE_RECORD_FIXED,	\
		   smin, srec, dec, enc)
#define EF_LIN_FIX_N(fid, sfi, ns, flags, smin, srec, nl)		\
		EF_LIN_FIX(fid, sfi, ns, flags, smin, srec, nl, 	\
			   &default_decode, NULL)

struct osim_file_desc *
osim_file_find_name(struct osim_file_desc *parent, const char *name);

enum osim_card_sw_type {
	SW_TYPE_NONE,
	SW_TYPE_STR,
};

enum osim_card_sw_class {
	SW_CLS_NONE,
	SW_CLS_OK,
	SW_CLS_POSTP,
	SW_CLS_WARN,
	SW_CLS_ERROR,
};

struct osim_card_sw {
	uint16_t code;
	uint16_t mask;
	enum osim_card_sw_type type;
	enum osim_card_sw_class class;
	union {
		const char *str;
	} u;
};

#define OSIM_CARD_SW_LAST	(const struct osim_card_sw) {	\
	.code = 0, .mask = 0, .type = SW_TYPE_NONE,	\
	.class = SW_CLS_NONE, .u.str = NULL		\
}

struct osim_card_profile {
	const char *name;
	struct osim_file_desc *mf;
	const struct osim_card_sw **sws;
};

const struct osim_card_sw *osim_find_sw(const struct osim_card_profile *cp,
					uint16_t sw);
enum osim_card_sw_class osim_sw_class(const struct osim_card_profile *cp,
					uint16_t sw_in);

struct osim_card_hdl;
char *osim_print_sw(const struct osim_card_hdl *ch, uint16_t sw_in);

extern const struct tlv_definition ts102221_fcp_tlv_def;
const struct value_string ts102221_fcp_vals[14];

/* 11.1.1.3 */
enum ts102221_fcp_tag {
	UICC_FCP_T_FCP		= 0x62,
	UICC_FCP_T_FILE_SIZE	= 0x80,
	UICC_FCP_T_TOT_F_SIZE	= 0x81,
	UICC_FCP_T_FILE_DESC	= 0x82,
	UICC_FCP_T_FILE_ID	= 0x83,
	UICC_FCP_T_DF_NAME	= 0x84,
	UICC_FCP_T_SFID		= 0x88,
	UICC_FCP_T_LIFEC_STS	= 0x8A,
	UICC_FCP_T_SEC_ATTR_REFEXP= 0x8B,
	UICC_FCP_T_SEC_ATTR_COMP= 0x8C,
	UICC_FCP_T_PROPRIETARY	= 0xA5,
	UICC_FCP_T_SEC_ATTR_EXP	= 0xAB,
	UICC_FCP_T_PIN_STS_DO	= 0xC6,
};

struct msgb *osim_new_apdumsg(uint8_t cla, uint8_t ins, uint8_t p1,
			      uint8_t p2, uint16_t lc, uint16_t le);

struct osim_reader_ops;

struct osim_reader_hdl {
	/*! \brief member in global list of readers */
	struct llist_head list;
	struct osim_reader_ops *ops;
	void *priv;
	/*! \brief current card, if any */
	struct osim_card_hdl *card;
};

struct osim_card_hdl {
	/*! \brief member in global list of cards */
	struct llist_head list;
	/*! \brief reader through which card is accessed */
	struct osim_reader_hdl *reader;
	/*! \brief card profile */
	struct osim_card_profile *prof;

	/*! \brief list of channels for this card */
	struct llist_head channels;
};

struct osim_chan_hdl {
	/*! \brief linked to card->channels */
	struct llist_head list;
	/*! \brief card to which this channel belongs */
	struct osim_card_hdl *card;
	const struct osim_file_desc *cwd;
};

/* reader.c */
int osim_transceive_apdu(struct osim_chan_hdl *st, struct msgb *amsg);
struct osim_reader_hdl *osim_reader_open(int idx, const char *name, void *ctx);
struct osim_card_hdl *osim_card_open(struct osim_reader_hdl *rh);
#endif /* _OSMOCOM_SIM_H */