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package com.juick.server;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

/**
 *
 * @author ugnich
 */
public class SubscriptionsQueries {

    public static ArrayList<String> getJIDSubscribedToUser(Connection sql, int uid, boolean friendsonly) {
        ArrayList<String> jids = new ArrayList<String>();

        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            if (friendsonly == false) {
                stmt = sql.prepareStatement("SELECT jids.jid FROM subscr_users INNER JOIN jids ON (subscr_users.user_id=? AND subscr_users.suser_id=jids.user_id) WHERE jids.active=1");
                stmt.setInt(1, uid);
            } else {
                stmt = sql.prepareStatement("SELECT jids.jid FROM subscr_users INNER JOIN jids ON (subscr_users.user_id=? AND subscr_users.suser_id=jids.user_id) WHERE jids.active=1 AND jids.user_id IN (SELECT wl_user_id FROM wl_users WHERE user_id=?)");
                stmt.setInt(1, uid);
                stmt.setInt(2, uid);
            }
            rs = stmt.executeQuery();
            rs.beforeFirst();
            while (rs.next()) {
                jids.add(rs.getString(1));
            }
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            Utils.finishSQL(rs, stmt);
        }
        return jids;
    }

    public static ArrayList<String> getJIDSubscribedToUserAndTags(Connection sql, int uid, int mid) {
        ArrayList<String> jids = new ArrayList<String>();

        PreparedStatement stmt = null;
        ResultSet rs = null;

        String tbl = "subscr_jids_" + mid;
        ArrayList<Integer> tags = MessagesQueries.getMessageTagsIDs(sql, mid);

        try {
            stmt = sql.prepareStatement("CREATE TEMPORARY TABLE " + tbl + "(user_id INT UNSIGNED NOT NULL) ENGINE=MEMORY");
            stmt.executeUpdate();
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            Utils.finishSQL(null, stmt);
        }

        try {
            String query = "INSERT INTO " + tbl + " SELECT suser_id FROM subscr_users WHERE user_id=" + uid;
            if (!tags.isEmpty()) {
                query += " UNION DISTINCT SELECT suser_id FROM subscr_tags WHERE tag_id IN (" + Utils.convertArrayInt2String(tags) + ") AND suser_id!=" + uid;
            }
            stmt = sql.prepareStatement(query);
            stmt.executeUpdate();
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            Utils.finishSQL(null, stmt);
        }


        try {
            String query = "SELECT jids.jid FROM " + tbl + " INNER JOIN jids ON (" + tbl + ".user_id=jids.user_id) WHERE jids.active=1 AND " + tbl + ".user_id NOT IN (SELECT user_id FROM bl_users WHERE bl_user_id=" + uid + ")";
            if (!tags.isEmpty()) {
                query += " AND " + tbl + ".user_id NOT IN (SELECT user_id FROM bl_tags WHERE tag_id IN (" + Utils.convertArrayInt2String(tags) + "))";
            }
            stmt = sql.prepareStatement(query);
            rs = stmt.executeQuery();
            rs.beforeFirst();
            while (rs.next()) {
                jids.add(rs.getString(1));
            }
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            Utils.finishSQL(rs, stmt);
        }

        try {
            stmt = sql.prepareStatement("DROP TABLE " + tbl);
            stmt.executeUpdate();
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            Utils.finishSQL(null, stmt);
        }

        return jids;
    }

    public static ArrayList<String> getJIDSubscribedToComments(Connection sql, int mid, int ignore_uid) {
        ArrayList<String> jids = new ArrayList<String>();

        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            stmt = sql.prepareStatement("SELECT jids.jid FROM subscr_messages INNER JOIN jids ON (subscr_messages.message_id=? AND subscr_messages.suser_id=jids.user_id) WHERE jids.user_id!=? AND jids.active=1");
            stmt.setInt(1, mid);
            stmt.setInt(2, ignore_uid);
            rs = stmt.executeQuery();
            rs.beforeFirst();
            while (rs.next()) {
                jids.add(rs.getString(1));
            }
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            Utils.finishSQL(rs, stmt);
        }
        return jids;
    }

    public static ArrayList<String> getJIDSubscribedToUserRecommendations(Connection sql, int uid, int mid, int muid) {
        ArrayList<String> jids = new ArrayList<String>();

        ArrayList<Integer> tags = MessagesQueries.getMessageTagsIDs(sql, mid);

        PreparedStatement stmt = null;
        ResultSet rs = null;
        try {
            String query = "SELECT jid FROM jids WHERE active=1 AND user_id!=" + uid;
            query += " AND user_id IN (SELECT suser_id FROM subscr_users WHERE user_id=" + uid + ")";
            query += " AND user_id NOT IN (SELECT user_id FROM bl_users WHERE bl_user_id=" + muid + ")";
            query += " AND user_id NOT IN (SELECT suser_id FROM subscr_users WHERE user_id=" + muid + ")";
            query += " AND user_id NOT IN (SELECT suser_id FROM subscr_messages WHERE message_id=" + mid + ")";
            query += " AND user_id NOT IN (SELECT user_id FROM favorites WHERE message_id=" + mid + ")";
            query += " AND user_id NOT IN (SELECT subscr_users.suser_id FROM subscr_users INNER JOIN favorites ON (favorites.message_id=" + mid + " AND subscr_users.user_id=favorites.user_id AND favorites.user_id!=" + uid + "))";
            if (!tags.isEmpty()) {
                String tagsStr = Utils.convertArrayInt2String(tags);
                query += " AND user_id NOT IN (SELECT suser_id FROM subscr_tags WHERE tag_id IN (" + tagsStr + "))";
                query += " AND user_id NOT IN (SELECT user_id FROM bl_tags WHERE tag_id IN (" + tagsStr + "))";
            }

            stmt = sql.prepareStatement(query);
            rs = stmt.executeQuery();
            rs.beforeFirst();
            while (rs.next()) {
                jids.add(rs.getString(1));
            }
        } catch (SQLException e) {
            System.err.println(e);
        } finally {
            Utils.finishSQL(rs, stmt);
        }

        return jids;
    }

    public static boolean subscribeMessage(Connection sql, int mid, int vuid) {
        return SQLHelpers.execute(sql, "INSERT IGNORE INTO subscr_messages(suser_id,message_id) VALUES (" + vuid + "," + mid + ")") == 1;
    }
}