#include "trygvis/sensor/io.h"

#include <ostream>
#include <vector>
#include <map>
#include <mutex>
#include "json.hpp"
#include "boost/regex.hpp"

namespace trygvis {
namespace sensor {
namespace io {

using namespace std;
using json = nlohmann::json;

ThreadSafeSampleOutputStream::ThreadSafeSampleOutputStream(unique_ptr<SampleOutputStream> underlying)
        : underlying(move(underlying)) {
}

void ThreadSafeSampleOutputStream::write(SampleRecord const &sample) {
    std::unique_lock<std::mutex> lock(mutex);

    underlying->write(sample);
}

void VectorSampleOutputStream::write(SampleRecord const &sample) {
    if (sample.empty()) {
        return;
    }

    samples.emplace_back(sample);
}

CsvSampleOutputStream::CsvSampleOutputStream(shared_ptr<ostream> stream, KeyDictionary &dict)
        : stream(move(stream)), headerWritten(false), dict(dict) {
}

void CsvSampleOutputStream::write(SampleRecord const &sample) {
// Skip empty records
    if (sample.empty()) {
        return;
    }

// Build the dict with the keys from the first sample.
    if (dict.empty()) {
        SampleKeyIndex index = 0;
        auto ptr = sample.cbegin();
        while (ptr != sample.cend()) {
            auto o = *ptr;

            if (o) {
                auto name = sample.dict.at(index)->name;
                dict.indexOf(name);
            }

            ptr++;
            index++;
        }
    }

    if (!headerWritten) {
        writeHeader();
        headerWritten = true;
    }

    auto &s = *stream.get();

    auto it = dict.begin();
    while (it != dict.end()) {
        if (it != dict.begin()) {
            s << ",";
        }

        auto key = *it++;
        auto sampleKey = sample.dict.indexOf(key->name);
        auto o = sample.at(sampleKey);

        if (o) {
            s << o.get();
        }
    }

    s << endl;
}

void CsvSampleOutputStream::writeHeader() {
    auto &s = *stream.get();

    auto i = dict.begin();
    while (i != dict.end()) {
        s << (*i)->name;

        i++;

        if (i != dict.end()) {
            s << ",";
        }
    }

    s << endl;
}

JsonSampleOutputStream::JsonSampleOutputStream(shared_ptr<ostream> stream, KeyDictionary &dict) :
        dict(dict), stream(move(stream)) {
}

void JsonSampleOutputStream::write(SampleRecord const &sample) {
// Skip empty records
    if (sample.empty()) {
        return;
    }

    json doc({});

    if (!dict.empty()) {
        for (auto &key: dict) {
            auto sampleKey = sample.dict.indexOf(key->name);

            auto value = sample.at(sampleKey);

            if (value) {
                doc[key->name] = value.get();
            }
        }
    } else {
        for (auto &sampleKey: sample.dict) {
            auto o = sample.at(sampleKey);

            if (o) {
// Make sure that the key is registered in the dictionary
                dict.indexOf(sampleKey->name);
                doc[sampleKey->name] = o.get();
            }
        }
    }

    *stream.get() << doc << endl;
}

KeyValueSampleOutputStream::KeyValueSampleOutputStream(shared_ptr<ostream> stream, KeyDictionary &dict) :
        dict(dict), stream(move(stream)) {
}

void KeyValueSampleOutputStream::write(SampleRecord const &sample) {
// Skip empty records
    if (sample.empty()) {
        return;
    }

    auto &s = *stream.get();

    bool first = true;
    if (!dict.empty()) {
        for (auto &key: dict) {
            auto sampleKey = sample.dict.indexOf(key->name);

            auto value = sample.at(sampleKey);

            if (value) {
                if (first) {
                    first = false;
                } else {
                    s << ", ";
                }
                s << key->name << "=" << value.get();
            }
        }
    } else {
        for (auto &sampleKey: sample.dict) {
            auto o = sample.at(sampleKey);

            if (o) {
                if (first) {
                    first = false;
                } else {
                    s << ", ";
                }
// Make sure that the key is registered in the dictionary
                dict.indexOf(sampleKey->name);
                s << sampleKey->name << "=" << o.get();
            }
        }
    }

    *stream.get() << endl;
}

RrdSampleOutputStream::RrdSampleOutputStream(shared_ptr<ostream> stream, KeyDictionary &dict, const SampleKey *timestamp_key, o<output_fields *> output_fields)
        :
        stream(move(stream)), timestamp_key(timestamp_key) {
    if (output_fields) {
        for (auto field : output_fields.get()->fields) {
            keys.emplace_back(dict.indexOf(field));
        }
    } else {
        for (auto key : dict) {
            keys.emplace_back(key);
        }
    }
}

void RrdSampleOutputStream::write(SampleRecord const &sample) {
// Skip empty records
    if (sample.empty()) {
        return;
    }

    auto &s = *stream.get();

    auto timestampO = sample.at(timestamp_key);

    if (!timestampO) {
        return;
    }

    auto timestamp = timestampO.get();

    s << timestamp;

    bool first = true;
    for (auto &key: keys) {
        if (key == timestamp_key) {
            continue;
        }

        auto value = sample.at(key);

        if (first) {
            s << "@";
            first = false;
        } else {
            s << ":";
        }

        s << (value ? value.get() : "U");
    }

    *stream.get() << endl;
}

SqlSampleOutputStream::SqlSampleOutputStream(shared_ptr<ostream> stream, KeyDictionary &dict, string table_name) :
        dict(dict), stream(move(stream)), table_name(table_name) {
}

void SqlSampleOutputStream::write(SampleRecord const &values) {
    throw sample_exception("deimplemented");

//    string fs, vs;
//
//    fs.reserve(1024);
//    vs.reserve(1024);
//
//    if (filter_fields) {
//        auto i = fields.begin();
//
//        while (i != fields.end()) {
//            auto field = *i;
//
//            fs += field;
//
//            auto value = values.find(field);
//
//            if (value != values.end()) {
//                vs += "'" + value->second + "'";
//            } else {
//                vs += "NULL";
//            }
//
//            i++;
//
//            if (i != fields.end()) {
//                fs += ",";
//                vs += ",";
//            }
//        }
//    } else {
//        auto i = values.begin();
//        while (i != values.end()) {
//            auto v = *i++;
//
//            fs += v.first;
//            vs += "'" + v.second + "'";
//
//            if (i != values.end()) {
//                fs += ",";
//                vs += ",";
//            }
//        }
//    }
//
//    (*stream.get()) << "INSERT INTO " << table_name << "(" << fs << ") VALUES(" << vs << ");" << endl;
}

void KeyValueSampleStreamParser::process(mutable_buffers_1 buffer) {

    size_t size = buffer_size(buffer);

    if (size == 0 && line->size()) {
        process_line(line);
        line = make_shared<vector<uint8_t>>();
        return;
    }

    auto data = boost::asio::buffer_cast<const uint8_t *>(buffer);

    for (int i = 0; i < size; i++) {
        uint8_t b = data[i];

        if (b == packet_delimiter) {
            process_line(line);
            line = make_shared<vector<uint8_t>>();
        } else {
            line->push_back(b);
        }
    }

}

void KeyValueSampleStreamParser::process_line(shared_ptr<vector<uint8_t>> packet) {
    auto timestamp = std::chrono::system_clock::now().time_since_epoch().count();
    auto s = std::string((char *) packet->data(), packet->size());

    static const boost::regex e("([#_a-zA-Z0-9]+) *= *([0-9]+)");

    auto start = s.cbegin();
    auto end = s.cend();
    boost::match_results <std::string::const_iterator> what;
    boost::match_flag_type flags = boost::match_default;

    SampleRecord sample(dict);

    while (regex_search(start, end, what, e, flags)) {
        auto name = static_cast<string>(what[1]);
        auto value = static_cast<string>(what[2]);
        start = what[0].second;

        auto key = dict.indexOf(name);
        sample.set(key, value);

        flags |= boost::match_prev_avail;
        flags |= boost::match_not_bob;
    }

    output->write(sample);
}

AutoSampleParser::AutoSampleParser(shared_ptr<SampleOutputStream> output, KeyDictionary &dict) :
        SampleStreamParser(sample_format_type::AUTO), keyValueParser(new KeyValueSampleStreamParser(output, dict)) {
    // Directly select the parser now until we have more than one parser
    parser = std::move(keyValueParser);
    type_ = sample_format_type::KEY_VALUE;
}

void AutoSampleParser::process(mutable_buffers_1 buffer) {
    if (parser) {
        parser->process(buffer);
    } else {
        throw runtime_error("Not implemented yet");
    }
}

unique_ptr<SampleStreamParser> open_sample_input_stream(
        shared_ptr<SampleOutputStream> output,
        KeyDictionary &dict,
        sample_format_type type) {
    if (type == sample_format_type::KEY_VALUE) {
        return make_unique<KeyValueSampleStreamParser>(output, dict);
    } else if (type == sample_format_type::AUTO) {
        return make_unique<AutoSampleParser>(output, dict);
    } else {
        throw sample_exception("No parser for format type: " + to_string(type));
    }
}

template<typename T>
o<T *> find_option(vector<sample_output_stream_option *> &options) {
    for (sample_output_stream_option *&option : options) {
        T *x = dynamic_cast<T *>(option);

        if (x != nullptr) {
            return o<T *>(x);
        }
    }

    return o<T *>();
}

unique_ptr<SampleOutputStream> open_sample_output_stream(
        shared_ptr<ostream> output,
        KeyDictionary &dict,
        sample_format_type type,
        vector<sample_output_stream_option *> options) {

    if (type == sample_format_type::CSV) {
        return make_unique<CsvSampleOutputStream>(output, dict);
    } else if (type == sample_format_type::KEY_VALUE) {
        return make_unique<KeyValueSampleOutputStream>(output, dict);
    } else if (type == sample_format_type::JSON) {
        return make_unique<JsonSampleOutputStream>(output, dict);
    } else if (type == sample_format_type::RRD) {
        o<output_fields *> of = find_option<output_fields>(options);

        o<timestamp_field *> tsf = find_option<timestamp_field>(options);

        auto timestamp_key = dict.indexOf(tsf ? tsf.get()->name : "timestamp");

        return make_unique<RrdSampleOutputStream>(output, dict, timestamp_key, of);
//    } else if (type == sample_format_type::SQL) {
//        return make_unique<SqlSampleOutputStream>(dict, move(output), table_name);
    } else {
        throw sample_exception("No writer for format type: " + to_string(type));
    }
}

}
}
}