-- Prosody IM

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local get_prefs = module:require"mod_mam/mamprefs".get;

local set_prefs = module:require"mod_mam/mamprefs".set;

local rsm = module:require "mod_mam/rsm";

local jid_bare = require "util.jid".bare;

local jid_prep = require "util.jid".prep;

local date_parse = require "util.datetime".parse;

local st = require "util.stanza";

local archive_store = "archive2";

local archive = module:open_store(archive_store, "archive");

local global_default_policy = module:get_option("default_archive_policy", false);

local default_max_items, max_max_items = 20, module:get_option_number("max_archive_query_results", 50);

local conversation_interval = tonumber(module:get_option_number("archive_conversation_interval", 86400));

-- Feature discovery

local xmlns_archive = "urn:xmpp:archive"

local feature_archive = st.stanza("feature", {xmlns=xmlns_archive}):tag("optional");

if(global_default_policy) then

    feature_archive:tag("default");

end

module:add_extension(feature_archive);

module:add_feature("urn:xmpp:archive:auto");

module:add_feature("urn:xmpp:archive:manage");

module:add_feature("urn:xmpp:archive:pref");

module:add_feature("http://jabber.org/protocol/rsm");

-- --------------------------------------------------

local function date_format(s)

    return os.date("%Y-%m-%dT%H:%M:%SZ", s);

end

local function prefs_to_stanza(prefs)

    local prefstanza = st.stanza("pref", { xmlns="urn:xmpp:archive" });

    local default = prefs[false] ~= nil and prefs[false] or global_default_policy;

    prefstanza:tag("default", {otr="oppose", save=default and "true" or "false"}):up();

    prefstanza:tag("method", {type="auto", use="concede"}):up();

    prefstanza:tag("method", {type="local", use="concede"}):up();

    prefstanza:tag("method", {type="manual", use="concede"}):up();

    for jid, choice in pairs(prefs) do

        if jid then

            prefstanza:tag("item", {jid=jid, otr="prefer", save=choice and "message" or "false" }):up()

        end

    end

    return prefstanza;

end

local function prefs_from_stanza(stanza, username)

    local current_prefs = get_prefs(username);

    -- "default" | "item" | "session" | "method"

    for elem in stanza:children() do

        if elem.name == "default" then

            current_prefs[false] = elem.attr["save"] == "true";

        elseif elem.name == "item" then

            current_prefs[elem.attr["jid"]] = not elem.attr["save"] == "false";

        elseif elem.name == "session" then

            module:log("info", "element is not supported: " .. tostring(elem));

--            local found = false;

--            for child in data:children() do

--                if child.name == elem.name and child.attr["thread"] == elem.attr["thread"] then

--                    for k, v in pairs(elem.attr) do

--                        child.attr[k] = v;

--                    end

--                    found = true;

--                    break;

--                end

--            end

--            if not found then

--                data:tag(elem.name, elem.attr):up();

--            end

        elseif elem.name == "method" then

            module:log("info", "element is not supported: " .. tostring(elem));

--            local newpref = stanza.tags[1]; -- iq:pref

--            for _, e in ipairs(newpref.tags) do

--                -- if e.name ~= "method" then continue end

--                local found = false;

--                for child in data:children() do

--                    if child.name == "method" and child.attr["type"] == e.attr["type"] then

--                        child.attr["use"] = e.attr["use"];

--                        found = true;

--                        break;

--                    end

--                end

--                if not found then

--                    data:tag(e.name, e.attr):up();

--                end

--            end

        end

    end

end

------------------------------------------------------------

-- Preferences

------------------------------------------------------------

local function preferences_handler(event)

    local origin, stanza = event.origin, event.stanza;

    local user = origin.username;

    local reply = st.reply(stanza);

    if stanza.attr.type == "get" then

        reply:add_child(prefs_to_stanza(get_prefs(user)));

    end

    if stanza.attr.type == "set" then

        local new_prefs = stanza:get_child("pref", xmlns_archive);

        if not new_prefs then return false; end

        local prefs = prefs_from_stanza(stanza, origin.username);

        local ok, err = set_prefs(user, prefs);

        if not ok then

            return origin.send(st.error_reply(stanza, "cancel", "internal-server-error", "Error storing preferences: "..tostring(err)));

        end

    end

    return origin.send(reply);

end

local function auto_handler(event)

    local origin, stanza = event.origin, event.stanza;

    if not stanza.attr["type"] == "set" then return false; end

    local user = origin.username;

    local prefs = get_prefs(user);

    local auto = stanza:get_child("auto", xmlns_archive);

    prefs[false] = auto.attr["save"] ~= nil and auto.attr["save"] == "true" or false;

    set_prefs(user, prefs);

    return origin.send(st.reply(stanza));

end

-- excerpt from mod_storage_sql2

local function get_db()

    local mod_sql = module:require("sql");

    local params = module:get_option("sql");

    local engine;

    params = params or { driver = "SQLite3" };

    if params.driver == "SQLite3" then

        params.database = resolve_relative_path(prosody.paths.data or ".", params.database or "prosody.sqlite");

    end

    assert(params.driver and params.database, "Both the SQL driver and the database need to be specified");

    engine = mod_sql:create_engine(params);

    engine:set_encoding();

    return engine;

end

------------------------------------------------------------

-- Collections. In our case there is one conversation with each contact for the whole day for simplicity

------------------------------------------------------------

local function list_stanza_to_query(origin, list_el)

    local sql = "SELECT `with`, `when` / ".. conversation_interval .." as `day`, COUNT(0) FROM `prosodyarchive` WHERE `host`=? AND `user`=? AND `store`=? ";

    local args = {origin.host, origin.username, archive_store};

    local with = list_el.attr["with"];

    if with ~= nil then

        sql = sql .. "AND `with` = ? ";

        table.insert(args, jid_bare(with));

    end

    local after = list_el.attr["start"];

    if after ~= nil then

        sql = sql .. "AND `when` >= ?";

        table.insert(args, date_parse(after));

    end

    local before = list_el.attr["end"];

    if before ~= nil then

        sql = sql .. "AND `when` <= ? ";

        table.insert(args, date_parse(before));

    end

    sql = sql .. "GROUP BY `with`, `when` / ".. conversation_interval .." ORDER BY `when` / ".. conversation_interval .." ASC ";

    local qset = rsm.get(list_el);

    local limit = math.min(qset and qset.max or default_max_items, max_max_items);

    sql = sql.."LIMIT ?";

    table.insert(args, limit);

    table.insert(args, 1, sql);

    return args;

end

local function list_handler(event)

    local db = get_db();

    local origin, stanza = event.origin, event.stanza;

    local reply = st.reply(stanza);

    local query = list_stanza_to_query(origin, stanza.tags[1]);

    local list = reply:tag("list", {xmlns=xmlns_archive});

    for row in db:select(unpack(query)) do

        list:tag("chat", {

            xmlns=xmlns_archive,

            with=row[1],

            start=date_format(row[2] * conversation_interval),

            version=row[3]

        }):up();

    end

    origin.send(reply);

    return true;

end

------------------------------------------------------------

-- Message archive retrieval

------------------------------------------------------------

local function retrieve_handler(event)

    local origin, stanza = event.origin, event.stanza;

    local reply = st.reply(stanza);

    local retrieve = stanza:get_child("retrieve", xmlns_archive);

    local qwith = retrieve.attr["with"];

    local qstart = retrieve.attr["start"];

    module:log("debug", "Archive query, with %s from %s)",

        qwith or "anyone", qstart or "the dawn of time");

    if qstart then -- Validate timestamps

        local vstart = (qstart and date_parse(qstart));

        if (qstart and not vstart) then

            origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid timestamp"))

            return true

        end

        qstart = vstart;

    end

    if qwith then -- Validate the "with" jid

        local pwith = qwith and jid_prep(qwith);

        if pwith and not qwith then -- it failed prepping

            origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid JID"))

            return true

        end

        qwith = jid_bare(pwith);

    end

    -- RSM stuff

    local qset = rsm.get(retrieve);

    local qmax = math.min(qset and qset.max or default_max_items, max_max_items);

    local reverse = qset and qset.before or false;

    local before, after = qset and qset.before, qset and qset.after;

    if type(before) ~= "string" then before = nil; end

    -- Load all the data!

    local data, err = archive:find(origin.username, {

        start = qstart; ["end"] = qstart + conversation_interval;

        with = qwith;

        limit = qmax;

        before = before; after = after;

        reverse = reverse;

        total = true;

    });

    if not data then

        return origin.send(st.error_reply(stanza, "cancel", "internal-server-error", err));

    end

    local count = err;

    local chat = reply:tag("chat", {xmlns=xmlns_archive, with=qwith, start=date_format(qstart), version=count});

    module:log("debug", "Count "..count);

    for id, item, when in data do

        tag = chat:tag(tag, {secs = when - qstart});

    end

    origin.send(reply);

    return true;

end

local function not_implemented(event)

    local origin, stanza = event.origin, event.stanza;

    local reply = st.reply(stanza):tag("error", {type="cancel"});

    reply:tag("feature-not-implemented", {xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"}):up();

    origin.send(reply);

end

-- Preferences

module:hook("iq/self/urn:xmpp:archive:pref", preferences_handler);

module:hook("iq/self/urn:xmpp:archive:auto", auto_handler);

module:hook("iq/self/urn:xmpp:archive:itemremove", not_implemented);

module:hook("iq/self/urn:xmpp:archive:sessionremove", not_implemented);

-- Message Archive Management

module:hook("iq/self/urn:xmpp:archive:list", list_handler);

module:hook("iq/self/urn:xmpp:archive:retrieve", retrieve_handler);

module:hook("iq/self/urn:xmpp:archive:remove", not_implemented);

-- manual archiving

module:hook("iq/self/urn:xmpp:archive:save", not_implemented);

-- replication

module:hook("iq/self/urn:xmpp:archive:modified", not_implemented);