/* scrobbler.d: Main scrobbler class of Comedown
 *
 * Copyright (c) 2010 Kirn Gill <segin2005@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */

module comedown.scrobbler;
import comedown.types.scrobble;

import std.array;
import std.string;
import std.xml;
import std.md5;
import std.uri;
import std.conv;
import std.date;
import std.stdio;
import std.string;
import std.socket;
import std.socketstream;
import std.c.stdio;
import std.c.string;

struct APIPath {
    string host;
    int port;
    string path;
};

class Scrobbler {

private:
    Scrobble[] scrobbles;
    string appid;
    string appver;
    string user;
    string pass;
    string status;
    string sessionkey;
    APIPath npPath;
    APIPath submitPath;

    void init()
    {
        sessionkey = getSessionKey();
    }

    /* This function also sets the path for "now playing" and
     * "scrobble" submits.
     */
    string getSessionKey()
    {
        writefln("comedown.scrobbler: Last.fm username: " ~
            user ~ ", password: " ~ "*".repeat(pass.length));
        auto curtime = to!string(getUTCtime() / ticksPerSecond);
        auto authkey = MD5Str(MD5Str(pass) ~ curtime);
        writefln("curtime: " ~ curtime ~ ", authkey: " ~ authkey);
        auto a = APIPath("post.audioscrobbler.com", 80, "/");
        auto getdata = [
                "hs" : "true",
                "p"  : "1.2.1",
                "c"  : appid,
                "v"  : appver,
                "u"  : user,
                "t"  : curtime,
                "a"  : authkey
                ];
        auto response = submitData(a, getdata, "GET");
        if(response.length == 0) {
            return "";
        } else {
            ;
        }
        return "";
    }

    string[] submitData(APIPath path, string[string] request, string requestType)
    {
        string[] returnData;
        auto requestSerial = requestType == "GET" ? "?" : "";
        foreach(requestKey, requestValue; request) {
            requestSerial ~= encodeComponent(requestKey) ~ "=" ~
                encodeComponent(requestValue) ~ "&";
        };

        requestSerial.popBack;

        writefln(requestSerial);

        try {
            auto sock = new TcpSocket(new InternetAddress
                (path.host, cast(ushort) path.port));
            auto ss = new SocketStream(sock);
        }

        catch (Exception e) {
            std.stdio.stderr.writefln("Exception: " ~ e.toString());
        }

        return [];
    }

    string MD5Str(string str)
    {
        ubyte[16u] digest;
        MD5_CTX context;
        context.start();
        context.update(str);
        context.finish(digest);
        return digestToString(digest);
    }

public:
    this(string appid, string appver, string user, string pass)
    {
        this.appid = appid;
        this.user = user;
        this.pass = pass;
        init();
    }

    void setUser(string user, string pass)
    {
        sessionkey = "";
        this.user = user;
        this.pass = pass;
    }

}