############################# START CONFIGURATION ############################
 
# This is a configuration notecard based on the key-value data Wizardry and Steamworks reader. 
# Everything following the "#" character is ignored along with blank lines. Values can be set for various 
# parameters in a simple and understandable format with the following syntax: 
# KEY = "VALUE" 
# Every time you change this configuration notecard, the script will reset itself and the new configuration 
# will be read from this notecard.
 
# The "corrade", "group" and "password" settings must correspond to your settings in Corrade.ini
 
# This is the UUID of the Corrade bot.
corrade = "68505484-0699-4bc4-8f61-d74cd0c1146c"
 
# The name of the group - it can also be the UUID of the group.
group = "My Group"
 
# The password for the group.
password = "mypassword"
 
############################# END CONFIGURATION #############################

///////////////////////////////////////////////////////////////////////////
//  Copyright (C) Wizardry and Steamworks 2014 - License: CC BY 2.0      //
///////////////////////////////////////////////////////////////////////////
 
///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
string wasKeyValueGet(string k, string data) {
    if(llStringLength(data) == 0) return "";
    if(llStringLength(k) == 0) return "";
    list a = llParseStringKeepNulls(data, ["&", "="], []);
    integer i = llListFindList(llList2ListStrided(a, 0, -1, 2), [ k ]);
    if(i != -1) return llList2String(a, 2*i+1);
    return "";
}
 
///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2013 Wizardry and Steamworks - License: GNU GPLv3    //
///////////////////////////////////////////////////////////////////////////
string wasKeyValueEncode(list data) {
    list k = llList2ListStrided(data, 0, -1, 2);
    list v = llList2ListStrided(llDeleteSubList(data, 0, 0), 0, -1, 2);
    data = [];
    do {
        data += llList2String(k, 0) + "=" + llList2String(v, 0);
        k = llDeleteSubList(k, 0, 0);
        v = llDeleteSubList(v, 0, 0);
    } while(llGetListLength(k) != 0);
    return llDumpList2String(data, "&");
}
 
///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: GNU GPLv3    //
///////////////////////////////////////////////////////////////////////////
// escapes a string in conformance with RFC1738
string wasURLEscape(string i) {
    string o = "";
    do {
        string c = llGetSubString(i, 0, 0);
        i = llDeleteSubString(i, 0, 0);
        if(c == "") jump continue;
        if(c == " ") {
            o += "+";
            jump continue;
        }
        if(c == "\n") {
            o += "%0D" + llEscapeURL(c);
            jump continue;
        }
        o += llEscapeURL(c);
@continue;
    } while(i != "");
    return o;
}
 
///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: GNU GPLv3    //
///////////////////////////////////////////////////////////////////////////
// unescapes a string in conformance with RFC1738
string wasURLUnescape(string i) {
    return llUnescapeURL(
        llDumpList2String(
            llParseString2List(
                llDumpList2String(
                    llParseString2List(
                        i, 
                        ["+"], 
                        []
                    ), 
                    " "
                ), 
                ["%0D%0A"], 
                []
            ), 
            "\n"
        )
    );
}
 
///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: GNU GPLv3    //
///////////////////////////////////////////////////////////////////////////
list wasCSVToList(string csv) {
    list l = [];
    list s = [];
    string m = "";
    do {
        string a = llGetSubString(csv, 0, 0);
        csv = llDeleteSubString(csv, 0, 0);
        if(a == ",") {
            if(llList2String(s, -1) != "\"") {
                l += m;
                m = "";
                jump continue;
            }
            m += a;
            jump continue;
        }
        if(a == "\"" && llGetSubString(csv, 0, 0) == a) {
            m += a;
            csv = llDeleteSubString(csv, 0, 0);
            jump continue;
        }
        if(a == "\"") {
            if(llList2String(s, -1) != a) {
                s += a;
                jump continue;
            }
            s = llDeleteSubList(s, -1, -1);
            jump continue;
        }
        m += a;
@continue;
    } while(csv != "");
    // postcondition: length(s) = 0
    return l + m;
}
 
 
 
///////////////////////////////////////////////////////////////////////////
//    Copyright (C) 2015 Wizardry and Steamworks - License: CC BY 2.0    //
///////////////////////////////////////////////////////////////////////////
string wasListToCSV(list l) {
    list v = [];
    do {
        string a = llDumpList2String(
            llParseStringKeepNulls(
                llList2String(
                    l, 
                    0
                ), 
                ["\""], 
                []
            ),
            "\"\""
        );
        if(llParseStringKeepNulls(
            a, 
            [" ", ",", "\n", "\""], []
            ) != 
            (list) a
        ) a = "\"" + a + "\"";
        v += a;
        l = llDeleteSubList(l, 0, 0);
    } while(l != []);
    return llDumpList2String(v, ",");
}
 
///////////////////////////////////////////////////////////////////////////
//                  SQL STATEMENT DEFINITIONS                            //
///////////////////////////////////////////////////////////////////////////
 
string SQL_INSERT_VISITOR = "INSERT OR REPLACE INTO visitors (firstname, lastname, lastseen, time, memory) VALUES(:firstname, :lastname, :time, COALESCE((SELECT time FROM visitors WHERE firstname=:firstname AND lastname=:lastname), 0) + 1, :memory)";
string SQL_CREATE_TABLE = "CREATE TABLE IF NOT EXISTS visitors ('firstname' TEXT NOT NULL, 'lastname' TEXT NOT NULL, 'lastseen' TEXT NOT NULL, 'time' INTEGER NOT NULL, 'memory' INTEGER NOT NULL, PRIMARY KEY ('firstname', 'lastname'))";
string SQL_COUNT_VISITORS = "SELECT COUNT(*) AS 'Visits', AVG(time) AS 'Time', AVG(memory) AS 'Memory' FROM visitors";
string SQL_SELECT_VISITOR = "SELECT * FROM visitors ORDER BY lastseen DESC LIMIT 1 OFFSET :offset";
string SQL_DROP_TABLE = "DROP TABLE IF EXISTS visitors";
 
///////////////////////////////////////////////////////////////////////////
 
// corrade data
key CORRADE = NULL_KEY;
string GROUP = "";
string PASSWORD = "";
 
// for holding the callback URL
string callback = "";
 
// for notecard reading
integer line = 0;
 
// key-value data will be read into this list
list tuples = [];
list agents = [];
string agentName = "";
 
 
default {
    state_entry() {
        if(llGetInventoryType("configuration") != INVENTORY_NOTECARD) {
            llOwnerSay("Sorry, could not find a configuration inventory notecard.");
            return;
        }
        // DEBUG
        llOwnerSay("Reading configuration file...");
        llGetNotecardLine("configuration", line);
    }
    dataserver(key id, string data) {
        if(data == EOF) {
            // invariant, length(tuples) % 2 == 0
            if(llGetListLength(tuples) % 2 != 0) {
                llOwnerSay("Error in configuration notecard.");
                return;
            }
            CORRADE = llList2Key(
                tuples,
                llListFindList(
                    tuples, 
                    [
                        "corrade"
                    ]
                )
                +1
            );
            if(CORRADE == NULL_KEY) {
                llOwnerSay("Error in configuration notecard: corrade");
                return;
            }
            GROUP = llList2String(
                tuples,
                llListFindList(
                    tuples, 
                    [
                        "group"
                    ]
                )
                +1
            );
            if(GROUP == "") {
                llOwnerSay("Error in configuration notecard: group");
                return;
            }
            PASSWORD = llList2String(
                tuples,
                llListFindList(
                    tuples, 
                    [
                        "password"
                    ]
                )
                +1
            );
            if(PASSWORD == "") {
                llOwnerSay("Error in configuration notecard: password");
                return;
            }
            // DEBUG
            llOwnerSay("Read configuration notecard...");
            tuples = [];
            state url;
        }
        if(data == "") jump continue;
        integer i = llSubStringIndex(data, "#");
        if(i != -1) data = llDeleteSubString(data, i, -1);
        list o = llParseString2List(data, ["="], []);
        // get rid of starting and ending quotes
        string k = llDumpList2String(
            llParseString2List(
                llStringTrim(
                    llList2String(
                        o, 
                        0
                    ), 
                STRING_TRIM), 
            ["\""], []
        ), "\"");
        string v = llDumpList2String(
            llParseString2List(
                llStringTrim(
                    llList2String(
                        o, 
                        1
                    ), 
                STRING_TRIM), 
            ["\""], []
        ), "\"");
        if(k == "" || v == "") jump continue;
        tuples += k;
        tuples += v;
@continue;
        llGetNotecardLine("configuration", ++line);
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
}
 
state url {
    state_entry() {
        // DEBUG
        llOwnerSay("Requesting URL...");
        llRequestURL();
    }
    http_request(key id, string method, string body) {
        if(method != URL_REQUEST_GRANTED) return;
        callback = body;
        // DEBUG
        llOwnerSay("Got URL...");
        state detect;
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
}
 
state detect {
    state_entry() {
        // DEBUG
        llOwnerSay("Detecting if Corrade is online...");
        llSetTimerEvent(5);
    }
    timer() {
        llRequestAgentData(CORRADE, DATA_ONLINE);
    }
    dataserver(key id, string data) {
        if(data != "1") {
            // DEBUG
            llOwnerSay("Corrade is not online, sleeping...");
            llSetTimerEvent(30);
            return;
        }
        state initialize;
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
}
 
state initialize {
    state_entry() {
        // DEBUG
        llOwnerSay("Creating the database if it does not exist...");
        llInstantMessage(
            CORRADE, 
            wasKeyValueEncode(
                [
                    "command", "database",
                    "group", wasURLEscape(GROUP),
                    "password", wasURLEscape(PASSWORD),
                    "SQL", wasURLEscape(SQL_CREATE_TABLE),
                    "callback", wasURLEscape(callback)
                ]
            )
        );
        // alarm 60
        llSetTimerEvent(60);
    }
    timer() {
        // DEBUG
        llOwnerSay("Timeout creating table...");
        llResetScript();
    }
    http_request(key id, string method, string body) {
        llHTTPResponse(id, 200, "OK");
        if(wasKeyValueGet("command", body) == "database") {
            integer success = wasKeyValueGet("success", body) == "True";
            if(!success) {
                // DEBUG
                llOwnerSay("Failed to create the table: " + 
                    wasURLUnescape(
                        wasKeyValueGet(
                            "error", 
                            body
                        )
                    )
                );
                return;
            }
 
            // DEBUG
            llOwnerSay("Table created...");
            state show;
        }
    }
    link_message(integer sender_num, integer num, string str, key id) {
        if(str == "reset") {
            state reset;
        }
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
    state_exit() {
        llSetTimerEvent(0);
    }
}
 
state show {
    state_entry() {
        // DEBUG
        llOwnerSay("Updating display with the number of recorded visitors...");
        llInstantMessage(
            CORRADE, 
            wasKeyValueEncode(
                [
                    "command", "database",
                    "group", wasURLEscape(GROUP),
                    "password", wasURLEscape(PASSWORD),
                    "SQL", wasURLEscape(SQL_COUNT_VISITORS),
                    "callback", wasURLEscape(callback)
                ]
            )
        );
        // alarm 60
        llSetTimerEvent(60);
    }
    timer() {
        // DEBUG
        llOwnerSay("Timeout reading rows from visitors table...");
        llResetScript();
    }
    http_request(key id, string method, string body) {
        llHTTPResponse(id, 200, "OK");
        if(wasKeyValueGet("command", body) == "database") {
            integer success = wasKeyValueGet("success", body) == "True";
            if(!success) {
                // DEBUG
                llOwnerSay("Failed to enumerate visitors: " + 
                    wasURLUnescape(
                        wasKeyValueGet(
                            "error", 
                            body
                        )
                    )
                );
                llResetScript();
            }
            list data = wasCSVToList(
                wasURLUnescape(
                    wasKeyValueGet(
                        "data",
                        body
                    )
                )
            );
 
            // DEBUG
            //llOwnerSay("Data: " + llDumpList2String(data, ","));
 
            integer visits = llList2Integer(
                data, 
                llListFindList(
                    data, 
                    (list)"Visits"
                ) + 1
            );
            integer time = llList2Integer(
                data, 
                llListFindList(
                    data, 
                    (list)"Time"
                ) + 1
            );
            integer memory = llList2Integer(
                data, 
                llListFindList(
                    data, 
                    (list)"Memory"
                ) + 1
            );
 
            // Send message to xyz script.
            llMessageLinked(LINK_ROOT, 204000, "V:" + (string)visits, "0");
            llMessageLinked(LINK_ROOT, 204000, "T:" + (string)time + "m", "1");
            llMessageLinked(LINK_ROOT, 204000, "M:" + (string)memory + "k", "2");
 
            // Get the list of agents.
            agents = llGetAgentList(AGENT_LIST_REGION, []);
            state insert_trampoline;
        }
    }
    link_message(integer sender_num, integer num, string str, key id) {
        if(str == "reset")
            state reset;
        if(str == "display") {
            line = 0;
            state display;
        }
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
    state_exit() {
        llSetTimerEvent(0);
    }
}
 
state insert_trampoline {
    state_entry() {
        llSetTimerEvent(1);
    }
    timer() {
        state insert;
    }
    link_message(integer sender_num, integer num, string str, key id) {
        if(str == "reset")
            state reset;
        if(str == "display") {
            line = 0;
            state display;
        }
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
    state_exit() {
        llSetTimerEvent(0);
    }
}
 
state insert {
    state_entry() {
        // Once the list is empty, go back to display.
        if(llGetListLength(agents) == 0) {
            state show;
        }
 
        key agent = llList2Key(agents, 0);
        agents = llDeleteSubList(agents, 0, 0);
        list name = llParseString2List(llKey2Name(agent), [" "], []);
        if(llGetListLength(name) != 2) {
            return;
        }
        string firstname = llList2String(name, 0);
        string lastname = llList2String(name, 1);
        agentName = firstname + " " + lastname;
        string memory = (string)(
            (integer)(
                llList2Float(
                    llGetObjectDetails(
                        agent,
                        [OBJECT_SCRIPT_MEMORY]
                    ),
                    0
                )
                /
                1024 /*in kib, to mib 1048576*/
            )
 
        );
        // DEBUG
        //llOwnerSay("Memory: " + memory);
        // The command sent to Corrade responsible for adding a visitor
        // or updating the data for the visitor in case the visitor is
        // already entered into the visitors table. This is performed
        // with an INSER OR REPLACE sqlite command given the first name
        // and the last name of the avatar are unique primary keys.
        llInstantMessage(
            CORRADE,
            wasKeyValueEncode(
                [
                    "command", "database",
                    "group", wasURLEscape(GROUP),
                    "password", wasURLEscape(PASSWORD),
                    "SQL", wasURLEscape(SQL_INSERT_VISITOR),
                    "data", wasListToCSV(
                        [
                            "firstname",
                            firstname,
                            "lastname",
                            lastname,
                            "time",
                            llGetTimestamp(),
                            "memory",
                            memory
                        ]
                    ),
                    "callback", wasURLEscape(callback)
                ]
            )
        );
 
        // Command timeout.
        llSetTimerEvent(60);
    }
    http_request(key id, string method, string body) {
        llHTTPResponse(id, 200, "OK");
 
        // DEBUG
        //llOwnerSay(wasURLUnescape(body));
 
        if(wasKeyValueGet("command", body) == "database") {
            integer success = wasKeyValueGet("success", body) == "True";
            if(!success) {
                // DEBUG
                llOwnerSay("Failed to insert visitor " + agentName + " due to: " + 
                    wasURLUnescape(
                        wasKeyValueGet(
                            "error", 
                            body
                        )
                    )
                );
                state insert_trampoline;
            }
 
            // DEBUG
            llOwnerSay("Processed visitor named " + agentName + "...");
 
            state insert_trampoline;
        }
    }
    timer() {
        // DEBUG
        llOwnerSay("Inserting visitors has timed out, resetting...");
 
        state insert_trampoline;
    }
    link_message(integer sender_num, integer num, string str, key id) {
        if(str == "reset") {
            state reset;
        }
        if(str == "display") {
            line = 0;
            state display;
        }
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
    state_exit() {
        llSetTimerEvent(0);
    }
}
 
state display_trampoline {
    state_entry() {
        ++line;
        state display;
    }
    link_message(integer sender_num, integer num, string str, key id) {
        if(str == "reset")
            state reset;
    }
}
 
state display {
    state_entry() {
        llInstantMessage(
            CORRADE, 
            wasKeyValueEncode(
                [
                    "command", "database",
                    "group", wasURLEscape(GROUP),
                    "password", wasURLEscape(PASSWORD),
                    "SQL", wasURLEscape(SQL_SELECT_VISITOR),
                    "data", wasListToCSV(
                        [
                            "offset",
                            (string)line
                        ]
                    ),
                    "callback", wasURLEscape(callback)
                ]
            )
        );
 
        // alarm 60
        llSetTimerEvent(60);
    }
    http_request(key id, string method, string body) {
        llHTTPResponse(id, 200, "OK");
 
        if(wasKeyValueGet("command", body) == "database") {
            integer success = wasKeyValueGet("success", body) == "True";
            if(!success) {
                // DEBUG
                llOwnerSay("Failed to query the visitors table: " + 
                    wasURLUnescape(
                        wasKeyValueGet(
                            "error", 
                            body
                        )
                    )
                );
                return;
            }
 
            // Grab the data key if it exists.
            string dataKey = wasURLUnescape(
                wasKeyValueGet(
                    "data",
                    body
                )
            );
 
            // We got no more rows, so switch back to scanning.
            if(dataKey == "")
                state show;
 
            list data = wasCSVToList(dataKey);
 
            string firstname = llList2String(
                data, 
                llListFindList(
                    data, 
                    (list)"firstname"
                ) + 1
            );
            string lastname = llList2String(
                data, 
                llListFindList(
                    data, 
                    (list)"lastname"
                ) + 1
            );
            string lastseen = llList2String(
                data, 
                llListFindList(
                    data, 
                    (list)"lastseen"
                ) + 1
            );
 
            llOwnerSay(firstname + " " + lastname + " @ " + lastseen);
 
            state display_trampoline;
        }
    }
    link_message(integer sender_num, integer num, string str, key id) {
        if(str == "reset") {
            state reset;
        }
        // If the display button is pressed again, go back to the display and stop.
        if(str == "display") {
            state show;
        }
    }
    timer() {
        // DEBUG
        llOwnerSay("Timeout reading rows from visitors table...");
        llResetScript();
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
    state_exit() {
        llSetTimerEvent(0);
    }
}
 
state reset {
    state_entry() {
        // DEBUG
        llOwnerSay("Resetting all visitors...");
        llInstantMessage(
            CORRADE,
            wasKeyValueEncode(
                [
                    "command", "database",
                    "group", wasURLEscape(GROUP),
                    "password", wasURLEscape(PASSWORD),
                    "SQL", wasURLEscape(SQL_DROP_TABLE),
                    "callback", wasURLEscape(callback)
                ]
            )
        );
 
        // alarm 60
        llSetTimerEvent(60);
    }
    timer() {
        // DEBUG
        llOwnerSay("Timeout deleting database...");
        llResetScript();
    }
    http_request(key id, string method, string body) {
        llHTTPResponse(id, 200, "OK");
        if(wasKeyValueGet("command", body) == "database") {
            integer success = wasKeyValueGet("success", body) == "True";
            if(!success) {
                // DEBUG
                llOwnerSay("Failed to drop the visitors table: " + 
                    wasURLUnescape(
                        wasKeyValueGet(
                            "error", 
                            body
                        )
                    )
                );
                llResetScript();
            }
            // DEBUG
            llOwnerSay("Table dropped...");
            llResetScript();
        }
    }
    on_rez(integer num) {
        llResetScript();
    }
    changed(integer change) {
        if((change & CHANGED_INVENTORY) || (change & CHANGED_REGION_START)) {
            llResetScript();
        }
    }
    state_exit() {
        llSetTimerEvent(0);
    }
}