// Copyright (c) Hercules Dev Team, licensed under GNU GPL.
// See the LICENSE file
// Portions Copyright (c) Athena Dev Teams

#define HERCULES_CORE

#include "int_quest.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "char.h"
#include "inter.h"
#include "../common/db.h"
#include "../common/malloc.h"
#include "../common/mmo.h"
#include "../common/showmsg.h"
#include "../common/socket.h"
#include "../common/sql.h"
#include "../common/strlib.h"
#include "../common/timer.h"

/**
 * Loads the entire questlog for a character.
 *
 * @param char_id Character ID
 * @param count   Pointer to return the number of found entries.
 * @return Array of found entries. It has *count entries, and it is care of the
 *         caller to aFree() it afterwards.
 */
struct quest *mapif_quests_fromsql(int char_id, int *count) {
	struct quest *questlog = NULL;
	struct quest tmp_quest;
	SqlStmt *stmt;
	StringBuf buf;
	int i;
	int sqlerror = SQL_SUCCESS;

	if (!count)
		return NULL;

	stmt = SQL->StmtMalloc(sql_handle);
	if (stmt == NULL) {
		SqlStmt_ShowDebug(stmt);
		*count = 0;
		return NULL;
	}

	StrBuf->Init(&buf);
	StrBuf->AppendStr(&buf, "SELECT `quest_id`, `state`, `time`");
	for (i = 0; i < MAX_QUEST_OBJECTIVES; i++) {
		StrBuf->Printf(&buf, ", `count%d`", i+1);
	}
	StrBuf->Printf(&buf, " FROM `%s` WHERE `char_id`=?", quest_db);

	memset(&tmp_quest, 0, sizeof(struct quest));

	if (SQL_ERROR == SQL->StmtPrepare(stmt, StrBuf->Value(&buf))
	 || SQL_ERROR == SQL->StmtBindParam(stmt, 0, SQLDT_INT, &char_id, 0)
	 || SQL_ERROR == SQL->StmtExecute(stmt)
	 || SQL_ERROR == SQL->StmtBindColumn(stmt, 0, SQLDT_INT,  &tmp_quest.quest_id, 0, NULL, NULL)
	 || SQL_ERROR == SQL->StmtBindColumn(stmt, 1, SQLDT_INT,  &tmp_quest.state,    0, NULL, NULL)
	 || SQL_ERROR == SQL->StmtBindColumn(stmt, 2, SQLDT_UINT, &tmp_quest.time,     0, NULL, NULL)
	)
		sqlerror = SQL_ERROR;

	StrBuf->Destroy(&buf);

	for (i = 0; sqlerror != SQL_ERROR && i < MAX_QUEST_OBJECTIVES; i++) { // Stop on the first error
		sqlerror = SQL->StmtBindColumn(stmt, 3+i, SQLDT_INT,  &tmp_quest.count[i], 0, NULL, NULL);
	}

	if (sqlerror == SQL_ERROR) {
		SqlStmt_ShowDebug(stmt);
		SQL->StmtFree(stmt);
		*count = 0;
		return NULL;
	}

	*count = (int)SQL->StmtNumRows(stmt);
	if (*count > 0) {
		i = 0;
		questlog = (struct quest *)aCalloc(*count, sizeof(struct quest));

		while (SQL_SUCCESS == SQL->StmtNextRow(stmt)) {
			if (i >= *count) // Sanity check, should never happen
				break;
			memcpy(&questlog[i++], &tmp_quest, sizeof(tmp_quest));
		}
		if (i < *count) {
			// Should never happen. Compact array
			*count = i;
			questlog = aRealloc(questlog, sizeof(struct quest)*i);
		}
	}

	SQL->StmtFree(stmt);
	return questlog;
}

/**
 * Deletes a quest from a character's questlog.
 *
 * @param char_id  Character ID
 * @param quest_id Quest ID
 * @return false in case of errors, true otherwise
 */
bool mapif_quest_delete(int char_id, int quest_id) {
	if (SQL_ERROR == SQL->Query(sql_handle, "DELETE FROM `%s` WHERE `quest_id` = '%d' AND `char_id` = '%d'", quest_db, quest_id, char_id)) {
		Sql_ShowDebug(sql_handle);
		return false;
	}

	return true;
}

/**
 * Adds a quest to a character's questlog.
 *
 * @param char_id Character ID
 * @param qd      Quest data
 * @return false in case of errors, true otherwise
 */
bool mapif_quest_add(int char_id, struct quest qd) {
	StringBuf buf;
	int i;

	StrBuf->Init(&buf);
	StrBuf->Printf(&buf, "INSERT INTO `%s`(`quest_id`, `char_id`, `state`, `time`", quest_db);
	for (i = 0; i < MAX_QUEST_OBJECTIVES; i++) {
		StrBuf->Printf(&buf, ", `count%d`", i+1);
	}
	StrBuf->Printf(&buf, ") VALUES ('%d', '%d', '%d', '%d'", qd.quest_id, char_id, qd.state, qd.time);
	for (i = 0; i < MAX_QUEST_OBJECTIVES; i++) {
		StrBuf->Printf(&buf, ", '%d'", qd.count[i]);
	}
	StrBuf->AppendStr(&buf, ")");
	if (SQL_ERROR == SQL->Query(sql_handle, StrBuf->Value(&buf))) {
		Sql_ShowDebug(sql_handle);
		StrBuf->Destroy(&buf);
		return false;
	}
	StrBuf->Destroy(&buf);

	return true;
}

/**
 * Updates a quest in a character's questlog.
 *
 * @param char_id Character ID
 * @param qd      Quest data
 * @return false in case of errors, true otherwise
 */
bool mapif_quest_update(int char_id, struct quest qd) {
	StringBuf buf;
	int i;

	StrBuf->Init(&buf);
	StrBuf->Printf(&buf, "UPDATE `%s` SET `state`='%d'", quest_db, qd.state);
	for (i = 0; i < MAX_QUEST_OBJECTIVES; i++) {
		StrBuf->Printf(&buf, ", `count%d`='%d'", i+1, qd.count[i]);
	}
	StrBuf->Printf(&buf, " WHERE `quest_id` = '%d' AND `char_id` = '%d'", qd.quest_id, char_id);

	if (SQL_ERROR == SQL->Query(sql_handle, StrBuf->Value(&buf))) {
		Sql_ShowDebug(sql_handle);
		StrBuf->Destroy(&buf);
		return false;
	}
	StrBuf->Destroy(&buf);

	return true;
}

void mapif_quest_save_ack(int fd, int char_id, bool success)
{
	WFIFOHEAD(fd,7);
	WFIFOW(fd,0) = 0x3861;
	WFIFOL(fd,2) = char_id;
	WFIFOB(fd,6) = success?1:0;
	WFIFOSET(fd,7);
}

/**
 * Handles the save request from mapserver for a character's questlog.
 *
 * Received quests are saved, and an ack is sent back to the map server.
 *
 * @see inter_parse_frommap
 */
int mapif_parse_quest_save(int fd) {
	int i, j, k, old_n, new_n = (RFIFOW(fd,2)-8)/sizeof(struct quest);
	int char_id = RFIFOL(fd,4);
	struct quest *old_qd = NULL, *new_qd = NULL;
	bool success = true;

	if (new_n > 0)
		new_qd = (struct quest*)RFIFOP(fd,8);

	old_qd = mapif_quests_fromsql(char_id, &old_n);

	for (i = 0; i < new_n; i++) {
		ARR_FIND( 0, old_n, j, new_qd[i].quest_id == old_qd[j].quest_id );
		if (j < old_n) {
			// Update existing quests

			// Only states and counts are changeable.
			ARR_FIND( 0, MAX_QUEST_OBJECTIVES, k, new_qd[i].count[k] != old_qd[j].count[k] );
			if (k != MAX_QUEST_OBJECTIVES || new_qd[i].state != old_qd[j].state)
				success &= mapif_quest_update(char_id, new_qd[i]);

			if (j < (--old_n)) {
				// Compact array
				memmove(&old_qd[j],&old_qd[j+1],sizeof(struct quest)*(old_n-j));
				memset(&old_qd[old_n], 0, sizeof(struct quest));
			}
		} else {
			// Add new quests
			success &= mapif_quest_add(char_id, new_qd[i]);
		}
	}

	for (i = 0; i < old_n; i++) // Quests not in new_qd but in old_qd are to be erased.
		success &= mapif_quest_delete(char_id, old_qd[i].quest_id);

	if (old_qd)
		aFree(old_qd);

	// Send ack
	mapif_quest_save_ack(fd, char_id, success);

	return 0;
}

void mapif_send_quests(int fd, int char_id, struct quest *tmp_questlog, int num_quests)
{
	WFIFOHEAD(fd,num_quests*sizeof(struct quest)+8);
	WFIFOW(fd,0) = 0x3860;
	WFIFOW(fd,2) = num_quests*sizeof(struct quest)+8;
	WFIFOL(fd,4) = char_id;

	if (num_quests > 0)
		memcpy(WFIFOP(fd,8), tmp_questlog, sizeof(struct quest)*num_quests);

	WFIFOSET(fd,num_quests*sizeof(struct quest)+8);
}

/**
 * Sends questlog to the map server
 *
 * Note: Completed quests (state == Q_COMPLETE) are guaranteed to be sent last
 * and the map server relies on this behavior (once the first Q_COMPLETE quest,
 * all of them are considered to be Q_COMPLETE)
 *
 * @see inter_parse_frommap
 */
int mapif_parse_quest_load(int fd) {
	int char_id = RFIFOL(fd,2);
	struct quest *tmp_questlog = NULL;
	int num_quests;

	tmp_questlog = mapif_quests_fromsql(char_id, &num_quests);
	mapif_send_quests(fd, char_id, tmp_questlog, num_quests);

	if (tmp_questlog)
		aFree(tmp_questlog);

	return 0;
}

/**
 * Parses questlog related packets from the map server.
 *
 * @see inter_parse_frommap
 */
int inter_quest_parse_frommap(int fd) {
	switch(RFIFOW(fd,0)) {
		case 0x3060: mapif_parse_quest_load(fd); break;
		case 0x3061: mapif_parse_quest_save(fd); break;
		default:
			return 0;
	}
	return 1;
}