#pragma once

#include <osmocom/core/fsm.h>
#include <osmocom/gprs/gmm/gmm_prim.h>

struct gprs_gmm_entity;

/* Update type 10.5.5.18 */
enum gprs_gmm_upd_type {
	GPRS_GMM_UPD_TYPE_RA = 0,
	GPRS_GMM_UPD_TYPE_COMBINED_RA_LA = 1,
	GPRS_GMM_UPD_TYPE_COMBINED_RA_LA_IMSI = 2,
	GPRS_GMM_UPD_TYPE_PERIODIC = 3,
	/* others: reserved */
};
extern const struct value_string gprs_gmm_upd_type_names[];
static inline const char *gprs_gmm_upd_type_name(enum gprs_gmm_upd_type val)
{
	return get_value_string(gprs_gmm_upd_type_names, val);
}

/* 3GPP TS 24.008 § 4.1.3.1 GMM states in the MS */
enum gprs_gmm_ms_fsm_states {
	GPRS_GMM_MS_ST_NULL,			/* 4.1.3.1.1.1 */
	GPRS_GMM_MS_ST_DEREGISTERED,		/* 4.1.3.1.1.2 */
	GPRS_GMM_MS_ST_REGISTERED_INITIATED,	/* 4.1.3.1.1.3 */
	GPRS_GMM_MS_ST_REGISTERED,		/* 4.1.3.1.1.4 */
	GPRS_GMM_MS_ST_DEREGISTERED_INITIATED,	/* 4.1.3.1.1.5 */
	GPRS_GMM_MS_ST_RAU_INITIATED,		/* 4.1.3.1.1.6 */
	GPRS_GMM_MS_ST_SR_INITIATED,		/* 4.1.3.1.1.7 (Iu only) */
	//GPRS_GMM_MS_ST_DEREGISTERED_NORMAL,	/* 4.1.3.1.2.1 */
	//GPRS_GMM_MS_ST_DEREGISTERED_LIMITED,	/* 4.1.3.1.2.2 */
	//GPRS_GMM_MS_ST_DEREGISTERED_ATTACH_NEEDED, /* 4.1.3.1.2.3 */
	//GPRS_GMM_MS_ST_DEREGISTERED_ATTEMTPING_ATTACH, /* 4.1.3.1.2.4 */
	//GPRS_GMM_MS_ST_DEREGISTERED_NO_IMSI, /* 4.1.3.1.2.5 */
	//GPRS_GMM_MS_ST_DEREGISTERED_NO_CELL_AVAIL, /* 4.1.3.1.2.6 */
	//GPRS_GMM_MS_ST_DEREGISTERED_PLMN_SEARCH, /* 4.1.3.1.2.7 */
	//GPRS_GMM_MS_ST_DEREGISTERED_SUSPENDED,	/* 4.1.3.1.2.8 (Gb only) */
};

enum gprs_gmm_ms_fsm_events {
	GPRS_GMM_MS_EV_ENABLE_GPRS_MODE,
	GPRS_GMM_MS_EV_DISABLE_GPRS_MODE,
	GPRS_GMM_MS_EV_ATTACH_REQUESTED,
	GPRS_GMM_MS_EV_ATTACH_REJECTED, /* data: ptr to "uint8_t cause" */
	GPRS_GMM_MS_EV_ATTACH_ACCEPTED,
	GPRS_GMM_MS_EV_DETACH_REQUESTED, /* also network initiated. */
	GPRS_GMM_MS_EV_DETACH_REQUESTED_POWEROFF,
	GPRS_GMM_MS_EV_DETACH_ACCEPTED,
	GPRS_GMM_MS_EV_SR_REQUESTED, /* (Iu only) */
	GPRS_GMM_MS_EV_SR_REJECTED, /* (Iu only) */
	GPRS_GMM_MS_EV_SR_ACCEPTED, /* (Iu only) */
	GPRS_GMM_MS_EV_RAU_REQUESTED,
	GPRS_GMM_MS_EV_RAU_REJECTED, /* data: ptr to "uint8_t cause" */
	GPRS_GMM_MS_EV_RAU_ACCEPTED,
	GPRS_GMM_MS_EV_LOW_LVL_FAIL,
};

/* Info about last initiated attach: */
struct gprs_gmm_ms_fsm_attach_ctx {
	enum osmo_gprs_gmm_attach_type type;
	bool with_imsi;
	bool explicit_att; /* true if by SMREG-ATTACH.req requested it */
	bool implicit_att; /* true if GMMSM-ESTABLISH.req requested it */
	/* Retransmission of ATTACH REQUEST (T3310) */
	uint8_t req_attempts;
};

/* Info about last initiated detach: */
struct gprs_gmm_ms_fsm_detach_ctx {
	enum osmo_gprs_gmm_detach_ms_type type;
	enum osmo_gprs_gmm_detach_poweroff_type poweroff_type;
};

/* Info about last initiated RAU: */
struct gprs_gmm_ms_fsm_rau_ctx {
	enum gprs_gmm_upd_type type;
	/* Retransmission of RAU REQUEST (4.7.5.1.5) */
	uint8_t req_attempts;
};

struct gprs_gmm_ms_fsm_ctx {
	struct osmo_fsm_inst *fi;
	struct gprs_gmm_entity *gmme;

	struct gprs_gmm_ms_fsm_attach_ctx attach;
	struct gprs_gmm_ms_fsm_detach_ctx detach;
	struct gprs_gmm_ms_fsm_rau_ctx rau;
};

int gprs_gmm_ms_fsm_init(void);
void gprs_gmm_ms_fsm_set_log_cat(int logcat);

int gprs_gmm_ms_fsm_ctx_init(struct gprs_gmm_ms_fsm_ctx *ctx, struct gprs_gmm_entity *gmme);
void gprs_gmm_ms_fsm_ctx_release(struct gprs_gmm_ms_fsm_ctx *ctx);

int gprs_gmm_ms_fsm_ctx_request_attach(struct gprs_gmm_ms_fsm_ctx *ctx,
				       enum osmo_gprs_gmm_attach_type attach_type,
				       bool attach_with_imsi,
				       bool explicit_attach);

int gprs_gmm_ms_fsm_ctx_request_detach(struct gprs_gmm_ms_fsm_ctx *ctx,
				       enum osmo_gprs_gmm_detach_ms_type detach_type,
				       enum osmo_gprs_gmm_detach_poweroff_type poweroff_type);

int gprs_gmm_ms_fsm_ctx_request_rau(struct gprs_gmm_ms_fsm_ctx *ctx,
				    enum gprs_gmm_upd_type rau_type);