#include "jsonutil.h"
#include "database.h"

#include <nlohmann/json.hpp>

#include <fstream>

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

void JsonUtil::exportSellers(const std::filesystem::path& filePath, Marketplace* market)
{
    json root;
    std::ofstream file(filePath);

    for (const auto& seller : market->getSellers()) {
        json newEntry;
        newEntry["seller_no"] = seller->getSellerNo();
        newEntry["last_name"] = seller->getLastName();
        newEntry["first_name"] = seller->getFirstName();
        newEntry["num_offered_articles"] = seller->numArticlesOffered();
        root["sellers"].push_back(newEntry);
    }

    file << root.dump(4) << std::endl;
}

void JsonUtil::importSellers(const std::filesystem::path& filePath, Marketplace* market)
{
    for (auto& seller : market->getSellers()) {
        seller->setState(Seller::State::DELETE);
    }
    market->storeToDb(true);

    std::ifstream file(filePath);
    json jsonValues = json::parse(file);

    for (auto val : jsonValues["sellers"]) {
        auto seller = std::make_unique<Seller>();
        seller->setSellerNo(val["seller_no"]);
        seller->setLastName(val["last_name"]);
        seller->setFirstName(val["first_name"]);
        seller->setNumArticlesOffered(val["num_offered_articles"]);
        market->getSellers().push_back(std::move(seller));
    }

    // If there was no special seller "Sonderkonto" in import data, then create one
    auto specialSeller = market->findSellerWithSellerNo(0);
    if (!specialSeller) {
        auto seller = std::make_unique<Seller>();
        seller->setSellerNo(0);
        seller->setLastName("Sonderkonto");
        seller->setFirstName("Sonderkonto");
        seller->setNumArticlesOffered(0);
        market->getSellers().push_back(std::move(seller));
    }

    market->sortSellers();

    market->storeToDb();
}

void JsonUtil::exportSales(const std::filesystem::path& filePath, Marketplace* market, int cashPointNo)
{
    json root;
    std::ofstream file(filePath);

    root["source_no"] = cashPointNo;

    for (const auto& sale : market->getSales()) {
        if (sale->getSourceNo() != cashPointNo)
            continue;

        json newSale;
        newSale["uuid"] = sale->getUuidAsString();
        newSale["timestamp"] = sale->getTimestamp();

        for (const auto& article : sale->getArticles()) {
            json newArticle;
            newArticle["uuid"] = article->getUuidAsString();
            newArticle["seller_no"] = article->getSeller()->getSellerNo();
            newArticle["desc"] = article->getDescription();
            newArticle["price"] = article->getPrice();
            // newArticle["source_no"] = article->getSourceNo();
            newArticle["article_no"] = article->getArticleNo();

            newSale["articles"].push_back(newArticle);
        }

        root["sales"].push_back(newSale);
    }

    file << root.dump(4) << std::endl;
}

void JsonUtil::importSales(const std::filesystem::path& filePath, Marketplace* market, int cashPointNo)
{
    std::ifstream file(filePath);
    json jsonValues = json::parse(file);

    int source_no = jsonValues["source_no"];
    if (source_no == cashPointNo) {
        throw std::runtime_error("Die Kassen-Nr. der zu imporierenden Daten wird von dieser Kasse "
                                 "hier bereits verwendet.");
    }

    market->setSalesToDelete(jsonValues["source_no"]);
    market->storeToDb();

    for (const auto& valSale : jsonValues["sales"]) {
        auto sale = std::make_unique<Sale>();
        sale->setUuidFromString(valSale["uuid"]);
        sale->setSourceNo(jsonValues["source_no"]);
        sale->setTimestamp(valSale["timestamp"]);
        for (const auto& valArticle : valSale["articles"]) {
            auto article = std::make_unique<Article>();
            article->setUuidFromString(valArticle["uuid"]);
            article->setSourceNo(jsonValues["source_no"]);
            article->setArticleNo(valArticle["article_no"]);
            article->setDescription(valArticle["desc"]);
            article->setPrice(valArticle["price"]);
            auto seller = market->findSellerWithSellerNo(valArticle["seller_no"]);
            if (seller == nullptr) {
                throw std::runtime_error(
                    "Die zu importierenden Daten verweisen auf einen nicht vorhandenen Verkäufer. "
                    "Die Daten konnten nicht importiert werden.");
                // continue;
            }
            sale->addArticle(article.get());
            seller->addArticle(std::move(article));
        }
        market->getSales().push_back(std::move(sale));
    }

    market->storeToDb();
}