#include "drivertests.hpp"
#include "drivenengine.hpp"
#include <iostream>
#include <iomanip>

static void write_closed_message(Channel *ch, StreamBuffer *out) {
    std::ostringstream oss;
    oss << "Chan " << ch->chid() << " closed [" << ch->error() << "]\n";
    out->write_bytes(oss.str());
}

static void dump_lines(StreamBuffer *in, StreamBuffer *out, int chid) {
    while (true) {
        std::string l = in->readline();
        if (l == "") break;
        std::ostringstream oss;
        oss << "Chan " << chid << ": " << l;
        out->write_bytes(oss.str());
    }
}

// This test allows input on stdin or on port 8085.
// You can type lines and see them echoed.
class DriverListenTest : public DrivenEngine {
public:
    std::vector<UniqueChannel> channels_;
    virtual void event_init(int argc, char *argv[]) {
        listen_port(8085);
    }
    
    virtual void event_update() {
        while (true) {
            UniqueChannel ch = new_incoming_channel();
            if (ch == nullptr) break;
            ch->set_readline(true);
            channels_.emplace_back(std::move(ch));
        }

        Channel *stdioch = get_stdio_channel();
        dump_lines(stdioch->in(), stdioch->out(), 0);
        std::vector<UniqueChannel> keep;
        for (UniqueChannel &ch : channels_) {
            dump_lines(ch->in(), stdioch->out(), ch->chid());
            if (ch->closed()) {
                write_closed_message(ch.get(), stdioch->out());
            } else {
                keep.emplace_back(std::move(ch));
            }
        }
        channels_ = std::move(keep);
    }
};

// This test connects to a public webserver and prints
// the output from the server.
class DriverWebServerTest : public DrivenEngine {
public:
    std::vector<UniqueChannel> channels_;
    virtual void event_init(int argc, char *argv[]) {
        UniqueChannel ch = new_outgoing_channel("stanford.edu:80");
        ch->out()->write_bytes("GET http://stanford.edu/index.html HTTP/1.1\n\n");
        channels_.emplace_back(std::move(ch));
    }
    
    virtual void event_update() {
        Channel *stdioch = get_stdio_channel();
        dump_lines(stdioch->in(), stdioch->out(), 0);
        std::vector<UniqueChannel> keep;
        for (UniqueChannel &ch : channels_) {
            dump_lines(ch->in(), stdioch->out(), ch->chid());
            if (ch->closed()) {
                write_closed_message(ch.get(), stdioch->out());
            } else {
                keep.emplace_back(std::move(ch));
            }
        }
        channels_ = std::move(keep);
    }
};

// This test produces a DNS resolution failure.
class DriverDNSFailTest : public DrivenEngine {
public:
    std::vector<UniqueChannel> channels_;
    virtual void event_init(int argc, char *argv[]) {
        UniqueChannel ch = new_outgoing_channel("akjsdkajshdakjshd.alk:80");
        ch->out()->write_bytes("GET http://stanford.edu/index.html HTTP/1.1\n\n");
        channels_.emplace_back(std::move(ch));
    }
    
    virtual void event_update() {
        Channel *stdioch = get_stdio_channel();
        dump_lines(stdioch->in(), stdioch->out(), 0);
        std::vector<UniqueChannel> keep;
        for (UniqueChannel &ch : channels_) {
            dump_lines(ch->in(), stdioch->out(), ch->chid());
            if (ch->closed()) {
                write_closed_message(ch.get(), stdioch->out());
            } else {
                keep.emplace_back(std::move(ch));
            }
        }
        channels_ = std::move(keep);
    }
};

// This test just prints the time.
class DriverPrintClockTest : public DrivenEngine {
public:
    int count;
    virtual void event_init(int argc, char *argv[]) {
        count = 0;
    }
    
    virtual void event_update() {
        std::cerr << std::fixed << std::setprecision(2) << get_clock() << "   ";
        count++;
        if (count == 10) {
            std::cerr << std::endl;
            count = 0;
        }
    }
};

UniqueDrivenEngine make_DriverListenTest() {
    return UniqueDrivenEngine(new DriverListenTest);
}

UniqueDrivenEngine make_DriverWebServerTest() {
    return UniqueDrivenEngine(new DriverWebServerTest);
}

UniqueDrivenEngine make_DriverDNSFailTest() {
    return UniqueDrivenEngine(new DriverDNSFailTest);
}

UniqueDrivenEngine make_DriverPrintClockTest() {
    return UniqueDrivenEngine(new DriverPrintClockTest);
}