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module kpcp.kpcp;

import std.net.curl;
import std.conv;
import std.stdio;
import std.uri;
import std.parallelism;
import std.json;
import std.array;
import std.format;
import std.exception;


enum baseURL = `http://procon2014-practice.oknct-ict.org`;


typeof(func("url")) getProblem(alias func)(uint id)
if(is(typeof(func("url"))))
{
    return func(baseURL ~ `/problem/ppm/` ~ id.to!string);
}


alias getProblemAsBinary = getProblem!(get!(AutoProtocol, ubyte));
alias getProblemAsBinaryTask = getProblem!(a => task!(get!(AutoProtocol, ubyte))(a));
alias getProblemAsChunkAsync = getProblem!(a => byChunkAsync(a));


struct AnswerResult
{
    bool isAccepted;
    ulong mismatchCells;
    ulong swapScore;
    ulong selectScore;
    ulong totalScore;
}


AnswerResult sendAnswer(uint id, string userName, string password, string answer)
{
    auto app = appender!string();

    app.formattedWrite("username=%s", userName.encode);
    app.formattedWrite("&passwd=%s", password.encode);
    app.formattedWrite("&answer_text=%s", answer.encode);

    auto jsonData = post(baseURL ~ "/solve/json/" ~ id.to!string, app.data).parseJSON();

    AnswerResult result;
    result.isAccepted = jsonData["status"].str == "Accept";

    ulong getUlong(JSONValue jv)
    {
        if(jv.type == JSON_TYPE.UINTEGER)
            return jv.uinteger;
        else if(jv.type == JSON_TYPE.INTEGER)
            return jv.integer.to!ulong();
        else
            enforce(0);

        assert(0);
    }

    result.mismatchCells = getUlong(jsonData["mismatch_cells"]);
    result.swapScore = getUlong(jsonData["swap_score"]);
    result.selectScore = getUlong(jsonData["select_score"]);
    result.totalScore = getUlong(jsonData["total_score"]);

    return result;
}


void main()
{
    auto p = getProblemAsBinary(1);
    writeln(p[0 .. 4].to!string);

    auto r = sendAnswer(1, "testkpcp", "1234", "2\r\n11\r\n21\r\nURDDLLURRDLLUURDDLUUD\r\n11\r\n40\r\nURDLURLDLURDRDLURUDLURDLLRDLUURRDLLURRDL\r\n");
    writeln(r);
}