/*
 * $Id$
 *
    Copyright (c) 2016-2020 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAfRRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <mio-mar.h>
#include "mio-prv.h"

#include <mariadb/mysql.h>

typedef struct sess_t sess_t;
typedef struct sess_qry_t sess_qry_t;

struct mio_svc_marc_t
{
	MIO_SVC_HEADER;

	struct
	{
		sess_t* ptr;
		mio_oow_t capa;
	} sess;
};

struct sess_qry_t
{
	mio_bch_t*   qptr;
	mio_oow_t    qlen;
	void*        qctx;

	sess_qry_t*  sq_next;
};

struct sess_t
{
	mio_dev_mar_t* dev;

	sess_qry_t* q_head;
	sess_qry_t* q_tail
};

mio_svc_marc_t* mio_svc_marc_start (mio_t* mio)
{
	mio_svc_marc_t* marc = MIO_NULL;

	marc = (mio_svc_marc_t*)mio_callocmem(mio, MIO_SIZEOF(*marc));
	if (MIO_UNLIKELY(!marc)) goto oops;

	marc->mio = mio;
	marc->svc_stop = mio_svc_marc_stop;

	MIO_SVCL_APPEND_SVC (&mio->actsvc, (mio_svc_t*)marc);
	return marc;

oops:
	if (marc)
	{
		mio_freemem (mio, marc);
	}
	return MIO_NULL;
}

void mio_svc_marc_stop (mio_svc_marc_t* marc)
{
	mio_t* mio = marc->mio;

	MIO_SVCL_UNLINK_SVC (marc);
	mio_freemem (mio, marc);
}

static void mar_on_disconnect (mio_dev_mar_t* dev)
{
}

static void mar_on_connect (mio_dev_mar_t* dev)
{
/*
	if (mio_dev_mar_querywithbchars(dev, "SHOW STATUS", 11) <= -1)
	{
		mio_dev_mar_halt (dev);
	}
*/
}

static void mar_on_query_started (mio_dev_mar_t* dev, int mar_ret)
{
#if 0
	if (mar_ret != 0)
	{
printf ("QUERY NOT SENT PROPERLY..%s\n", mysql_error(dev->hnd));
	}
	else
	{
printf ("QUERY SENT..\n");
		if (mio_dev_mar_fetchrows(dev) <= -1)
		{
printf ("FETCH ROW FAILURE - %s\n", mysql_error(dev->hnd));
			mio_dev_mar_halt (dev);
		}
	}
#endif
}

static void mar_on_row_fetched (mio_dev_mar_t* dev, void* data)
{
#if 0
	MYSQL_ROW row = (MYSQL_ROW)data;
	static int x = 0;
	if (!row) 
	{
		printf ("NO MORE ROW..\n");
		if (x == 0 && mio_dev_mar_querywithbchars(dev, "SELECT * FROM pdns.records", 26) <= -1) mio_dev_mar_halt (dev);
		x++;
	}
	else
	{
		if (x == 0)
			printf ("%s %s\n", row[0], row[1]);
		else if (x == 1)
			printf ("%s %s %s %s %s\n", row[0], row[1], row[2], row[3], row[4]);
		//printf ("GOT ROW\n");
	}
#endif
}

static mio_dev_mar_t* alloc_device (mio_svc_marc_t* marc)
{
	mio_t* mio = (mio_t*)marc->mio;
	mio_dev_mar_t* mar;
	mio_dev_mar_make_t mi;
	mio_dev_mar_connect_t ci;

	MIO_MEMSET (&ci, 0, MIO_SIZEOF(ci));
	ci.host = "localhost"; /* TOOD: use marc configuration */
	ci.port = 3306; /* TODO: use marc configuration */
	ci.username = ""; /* TODO: use marc configuration */
	ci.password = ""; /* TODO: use marc conifguration */
	ci.dbname = ""; /* TODO: use marc configuration */

	MIO_MEMSET (&mi, 0, MIO_SIZEOF(mi));
	mi.on_connect = mar_on_connect;
	mi.on_disconnect = mar_on_disconnect;
	mi.on_query_started = mar_on_query_started;
	mi.on_row_fetched = mar_on_row_fetched;

	mar = mio_dev_mar_make(mio, 0, &mi);
	if (!mar) return MIO_NULL;

	if (mio_dev_mar_connect(mar, &ci) <= -1) return MIO_NULL;
	
	return mar;
}


static sess_qry_t* make_session_query (mio_t* mio, const mio_bch_t* qptr, mio_oow_t qlen, void* qctx)
{
	sess_qry_t* sq;

	sq = mio_allocmem(mio, MIO_SIZEOF(*sq) + (MIO_SIZEOF(*qptr) * qlen));
	if (MIO_UNLIKELY(!sq)) return MIO_NULL;

	MIO_MEMCPY (sq + 1, qptr, (MIO_SIZEOF(*qptr) * qlen));

	sq->qptr = (mio_bch_t*)(sq + 1);
	sq->qlen = qlen;
	sq->qctx = qctx;
	sq->sq_next = MIO_NULL;

	return sq;
}

static MIO_INLINE void free_session_query (mio_t* mio, sess_qry_t* sq)
{
	mio_freemem (mio, sq);
}

static sess_t* get_session (mio_svc_marc_t* marc, int sid)
{
	mio_t* mio = marc->mio;
	sess_t* sess;

	if (sid >= marc->sess.capa)
	{
		sess_t* tmp;
		mio_oow_t newcapa;

		newcapa = marc->sess.capa + 16;
		if (newcapa <= sid) newcapa = sid + 1;
		newcapa = MIO_ALIGN_POW2(newcapa, 16);

		tmp = mio_reallocmem(mio, marc->sess.ptr, MIO_SIZEOF(sess_t) * newcapa);
		if (MIO_UNLIKELY(!tmp)) return MIO_NULL;

		MIO_MEMSET (&marc->sess.ptr[marc->sess.capa], 0, MIO_SIZEOF(sess_t) * (newcapa - marc->sess.capa));

		marc->sess.ptr = tmp;
		marc->sess.capa = newcapa;
	}

	sess = &marc->sess.ptr[sid];
	if (!sess->dev)
	{
		sess_qry_t* sq;

		sq = make_session_query(mio, "", 0, MIO_NULL); /* this is a place holder */
		if (MIO_UNLIKELY(!sq)) return MIO_NULL;

		sess->dev = alloc_device(marc);
		if (MIO_UNLIKELY(!sess->dev)) 
		{
			free_session_query (mio, sq);
			return MIO_NULL;
		}

		sess->q_head = sess->q_tail = sq;
	}

	return sess;
}


int mio_svc_mar_querywithbchars (mio_svc_marc_t* marc, int sid, const mio_bch_t* qptr, mio_oow_t qlen, void* qctx)
{
	mio_t* mio = marc->mio;
	sess_t* sess;

	sess = get_session(marc, sid);
	if (MIO_UNLIKELY(!sess)) return -1;


	if (!sess->q_head)
	{
		/* the first query for the device */
		sess_qry_t* sq;
		sq = make_session_query(mio, qptr, qlen, qctx);
		if (MIO_UNLIKELY(!sq)) return -1;

		sess->q_head = sq;
		sess->q_tail = sq;

/* what if it's not connected??? */

		if (mio_dev_mar_querywithbchars(sess->dev, qptr, qlen) <= -1) 
		{
			sess->q_head = MIO_NULL;
			sess->q_tail = MIO_NULL;
			free_session_query (mio, sq);
			return -1; /* TODO: need a context pointer */
		}
	}
	else
	{
		/* there is an ongoing query for the device */
		sess_qry_t* sq;
		sq = make_session_query(mio, qptr, qlen, qctx);
		if (MIO_UNLIKELY(!sq)) return -1;

		/* push it at the back */
		sess->q_tail->sq_next = sq;
		sess->q_tail = sq;
	}


#if 0
	dev = get_session(marc, sid);
	if (!dev)
	{
	}
	if (mio_dev_mar_querywithbchars(dev, qptr, qlen) <= -1) return -1; /* TODO: need a context pointer */
#endif
}


#if 0
mio_svc_mar_querywithbchars (1, "select...");
for (each row)
{
mio_svc_mar_querywithbchars (2, "xxxxxx");
}
#endif