#include "LocalModParseTask.h"

#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
#include <QJsonValue>
#include <quazip.h>
#include <quazipfile.h>
#include <toml.h>

#include "settings/INIFile.h"
#include "FileSystem.h"

namespace {

// NEW format
// https://github.com/MinecraftForge/FML/wiki/FML-mod-information-file/6f62b37cea040daf350dc253eae6326dd9c822c3

// OLD format:
// https://github.com/MinecraftForge/FML/wiki/FML-mod-information-file/5bf6a2d05145ec79387acc0d45c958642fb049fc
std::shared_ptr<ModDetails> ReadMCModInfo(QByteArray contents)
{
    auto getInfoFromArray = [&](QJsonArray arr)->std::shared_ptr<ModDetails>
    {
        if (!arr.at(0).isObject()) {
            return nullptr;
        }
        std::shared_ptr<ModDetails> details = std::make_shared<ModDetails>();
        auto firstObj = arr.at(0).toObject();
        details->mod_id = firstObj.value("modid").toString();
        auto name = firstObj.value("name").toString();
        // NOTE: ignore stupid example mods copies where the author didn't even bother to change the name
        if(name != "Example Mod") {
            details->name = name;
        }
        details->version = firstObj.value("version").toString();
        details->updateurl = firstObj.value("updateUrl").toString();
        auto homeurl = firstObj.value("url").toString().trimmed();
        if(!homeurl.isEmpty())
        {
            // fix up url.
            if (!homeurl.startsWith("http://") && !homeurl.startsWith("https://") && !homeurl.startsWith("ftp://"))
            {
                homeurl.prepend("http://");
            }
        }
        details->homeurl = homeurl;
        details->description = firstObj.value("description").toString();
        QJsonArray authors = firstObj.value("authorList").toArray();
        if (authors.size() == 0) {
            // FIXME: what is the format of this? is there any?
            authors = firstObj.value("authors").toArray();
        }

        for (auto author: authors)
        {
            details->authors.append(author.toString());
        }
        details->credits = firstObj.value("credits").toString();
        return details;
    };
    QJsonParseError jsonError;
    QJsonDocument jsonDoc = QJsonDocument::fromJson(contents, &jsonError);
    // this is the very old format that had just the array
    if (jsonDoc.isArray())
    {
        return getInfoFromArray(jsonDoc.array());
    }
    else if (jsonDoc.isObject())
    {
        auto val = jsonDoc.object().value("modinfoversion");
        if(val.isUndefined()) {
            val = jsonDoc.object().value("modListVersion");
        }
        int version = val.toDouble();
        if (version != 2)
        {
            qCritical() << "BAD stuff happened to mod json:";
            qCritical() << contents;
            return nullptr;
        }
        auto arrVal = jsonDoc.object().value("modlist");
        if(arrVal.isUndefined()) {
            arrVal = jsonDoc.object().value("modList");
        }
        if (arrVal.isArray())
        {
            return getInfoFromArray(arrVal.toArray());
        }
    }
    return nullptr;
}

// https://github.com/MinecraftForge/Documentation/blob/5ab4ba6cf9abc0ac4c0abd96ad187461aefd72af/docs/gettingstarted/structuring.md
std::shared_ptr<ModDetails> ReadMCModTOML(QByteArray contents)
{
    std::shared_ptr<ModDetails> details = std::make_shared<ModDetails>();

    char errbuf[200];
    // top-level table
    toml_table_t* tomlData = toml_parse(contents.data(), errbuf, sizeof(errbuf));

    if(!tomlData)
    {
        return nullptr;
    }

    // array defined by [[mods]]
    toml_array_t* tomlModsArr = toml_array_in(tomlData, "mods");
    if(!tomlModsArr)
    {
        qWarning() << "Corrupted mods.toml? Couldn't find [[mods]] array!";
        return nullptr;
    }

    // we only really care about the first element, since multiple mods in one file is not supported by us at the moment
    toml_table_t* tomlModsTable0 = toml_table_at(tomlModsArr, 0);
    if(!tomlModsTable0)
    {
        qWarning() << "Corrupted mods.toml? [[mods]] didn't have an element at index 0!";
        return nullptr;
    }

    // mandatory properties - always in [[mods]]
    toml_datum_t modIdDatum = toml_string_in(tomlModsTable0, "modId");
    if(modIdDatum.ok)
    {
        details->mod_id = modIdDatum.u.s;
        // library says this is required for strings
        free(modIdDatum.u.s);
    }
    toml_datum_t versionDatum = toml_string_in(tomlModsTable0, "version");
    if(versionDatum.ok)
    {
        details->version = versionDatum.u.s;
        free(versionDatum.u.s);
    }
    toml_datum_t displayNameDatum = toml_string_in(tomlModsTable0, "displayName");
    if(displayNameDatum.ok)
    {
        details->name = displayNameDatum.u.s;
        free(displayNameDatum.u.s);
    }
    toml_datum_t descriptionDatum = toml_string_in(tomlModsTable0, "description");
    if(descriptionDatum.ok)
    {
        details->description = descriptionDatum.u.s;
        free(descriptionDatum.u.s);
    }

    // optional properties - can be in the root table or [[mods]]
    toml_datum_t authorsDatum = toml_string_in(tomlData, "authors");
    QString authors = "";
    if(authorsDatum.ok)
    {
        authors = authorsDatum.u.s;
        free(authorsDatum.u.s);
    }
    else
    {
        authorsDatum = toml_string_in(tomlModsTable0, "authors");
        if(authorsDatum.ok)
        {
            authors = authorsDatum.u.s;
            free(authorsDatum.u.s);
        }
    }
    if(!authors.isEmpty())
    {
        // author information is stored as a string now, not a list
        details->authors.append(authors);
    }
    // is credits even used anywhere? including this for completion/parity with old data version
    toml_datum_t creditsDatum = toml_string_in(tomlData, "credits");
    QString credits = "";
    if(creditsDatum.ok)
    {
        authors = creditsDatum.u.s;
        free(creditsDatum.u.s);
    }
    else
    {
        creditsDatum = toml_string_in(tomlModsTable0, "credits");
        if(creditsDatum.ok)
        {
            credits = creditsDatum.u.s;
            free(creditsDatum.u.s);
        }
    }
    details->credits = credits;
    toml_datum_t homeurlDatum = toml_string_in(tomlData, "displayURL");
    QString homeurl = "";
    if(homeurlDatum.ok)
    {
        homeurl = homeurlDatum.u.s;
        free(homeurlDatum.u.s);
    }
    else
    {
        homeurlDatum = toml_string_in(tomlModsTable0, "displayURL");
        if(homeurlDatum.ok)
        {
            homeurl = homeurlDatum.u.s;
            free(homeurlDatum.u.s);
        }
    }
    if(!homeurl.isEmpty())
    {
        // fix up url.
        if (!homeurl.startsWith("http://") && !homeurl.startsWith("https://") && !homeurl.startsWith("ftp://"))
        {
            homeurl.prepend("http://");
        }
    }
    details->homeurl = homeurl;

    // this seems to be recursive, so it should free everything
    toml_free(tomlData);

    return details;
}

// https://fabricmc.net/wiki/documentation:fabric_mod_json
std::shared_ptr<ModDetails> ReadFabricModInfo(QByteArray contents)
{
    QJsonParseError jsonError;
    QJsonDocument jsonDoc = QJsonDocument::fromJson(contents, &jsonError);
    auto object = jsonDoc.object();
    auto schemaVersion = object.contains("schemaVersion") ? object.value("schemaVersion").toInt(0) : 0;

    std::shared_ptr<ModDetails> details = std::make_shared<ModDetails>();

    details->mod_id = object.value("id").toString();
    details->version = object.value("version").toString();

    details->name = object.contains("name") ? object.value("name").toString() : details->mod_id;
    details->description = object.value("description").toString();

    if (schemaVersion >= 1)
    {
        QJsonArray authors = object.value("authors").toArray();
        for (auto author: authors)
        {
            if(author.isObject()) {
                details->authors.append(author.toObject().value("name").toString());
            }
            else {
                details->authors.append(author.toString());
            }
        }

        if (object.contains("contact"))
        {
            QJsonObject contact = object.value("contact").toObject();

            if (contact.contains("homepage"))
            {
                details->homeurl = contact.value("homepage").toString();
            }
        }
    }
    return details;
}

// https://github.com/QuiltMC/rfcs/blob/master/specification/0002-quilt.mod.json.md
std::shared_ptr<ModDetails> ReadQuiltModInfo(QByteArray contents)
{
    QJsonParseError jsonError;
    QJsonDocument jsonDoc = QJsonDocument::fromJson(contents, &jsonError);
    auto object = jsonDoc.object();

    std::shared_ptr<ModDetails> details = std::make_shared<ModDetails>();

    if (object.contains("schema_version") && object.value("schema_version").toInt() == 1)
    {
        QJsonObject loader = object.value("quilt_loader").toObject();
        details->mod_id = loader.value("id").toString();
        details->version = loader.value("version").toString();

        if (loader.contains("metadata"))
        {
            QJsonObject metadata = loader.value("metadata").toObject();
            details->name = metadata.contains("name") ? metadata.value("name").toString() : details->mod_id;

            if (metadata.contains("description"))
            {
                details->description = metadata.value("description").toString();
            }

            if (metadata.contains("contributors"))
            {
                // NOTE: This lists every contributor, not just "authors"
                details->authors = metadata.value("contributors").toObject().keys();
            }

            if (object.contains("contact"))
            {
                QJsonObject contact = object.value("contact").toObject();

                if (contact.contains("homepage"))
                {
                    details->homeurl = contact.value("homepage").toString();
                }
            }
        }
    }
    return details;
}

std::shared_ptr<ModDetails> ReadForgeInfo(QByteArray contents)
{
    std::shared_ptr<ModDetails> details = std::make_shared<ModDetails>();
    // Read the data
    details->name = "Minecraft Forge";
    details->mod_id = "Forge";
    details->homeurl = "http://www.minecraftforge.net/forum/";
    INIFile ini;
    if (!ini.loadFile(contents))
        return details;

    QString major = ini.get("forge.major.number", "0").toString();
    QString minor = ini.get("forge.minor.number", "0").toString();
    QString revision = ini.get("forge.revision.number", "0").toString();
    QString build = ini.get("forge.build.number", "0").toString();

    details->version = major + "." + minor + "." + revision + "." + build;
    return details;
}

std::shared_ptr<ModDetails> ReadLiteModInfo(QByteArray contents)
{
    std::shared_ptr<ModDetails> details = std::make_shared<ModDetails>();
    QJsonParseError jsonError;
    QJsonDocument jsonDoc = QJsonDocument::fromJson(contents, &jsonError);
    auto object = jsonDoc.object();
    if (object.contains("name"))
    {
        details->mod_id = details->name = object.value("name").toString();
    }
    if (object.contains("version"))
    {
        details->version = object.value("version").toString("");
    }
    else
    {
        details->version = object.value("revision").toString("");
    }
    details->mcversion = object.value("mcversion").toString();
    auto author = object.value("author").toString();
    if(!author.isEmpty()) {
        details->authors.append(author);
    }
    details->description = object.value("description").toString();
    details->homeurl = object.value("url").toString();
    return details;
}

}

LocalModParseTask::LocalModParseTask(int token, Mod::ModType type, const QFileInfo& modFile):
    m_token(token),
    m_type(type),
    m_modFile(modFile),
    m_result(new Result())
{
}

void LocalModParseTask::processAsZip()
{
    QuaZip zip(m_modFile.filePath());
    if (!zip.open(QuaZip::mdUnzip))
        return;

    QuaZipFile file(&zip);

    if (zip.setCurrentFile("META-INF/mods.toml"))
    {
        if (!file.open(QIODevice::ReadOnly))
        {
            zip.close();
            return;
        }

        m_result->details = ReadMCModTOML(file.readAll());
        file.close();

        // to replace ${file.jarVersion} with the actual version, as needed
        if (m_result->details && m_result->details->version == "${file.jarVersion}")
        {
            if (zip.setCurrentFile("META-INF/MANIFEST.MF"))
            {
                if (!file.open(QIODevice::ReadOnly))
                {
                    zip.close();
                    return;
                }

                // quick and dirty line-by-line parser
                auto manifestLines = file.readAll().split('\n');
                QString manifestVersion = "";
                for (auto &line : manifestLines)
                {
                    if (QString(line).startsWith("Implementation-Version: "))
                    {
                        manifestVersion = QString(line).remove("Implementation-Version: ");
                        break;
                    }
                }

                // some mods use ${projectversion} in their build.gradle, causing this mess to show up in MANIFEST.MF
                // also keep with forge's behavior of setting the version to "NONE" if none is found
                if (manifestVersion.contains("task ':jar' property 'archiveVersion'") || manifestVersion == "")
                {
                    manifestVersion = "NONE";
                }

                m_result->details->version = manifestVersion;

                file.close();
            }
        }

        zip.close();
        return;
    }
    else if (zip.setCurrentFile("mcmod.info"))
    {
        if (!file.open(QIODevice::ReadOnly))
        {
            zip.close();
            return;
        }

        m_result->details = ReadMCModInfo(file.readAll());
        file.close();
        zip.close();
        return;
    }
    else if (zip.setCurrentFile("fabric.mod.json"))
    {
        if (!file.open(QIODevice::ReadOnly))
        {
            zip.close();
            return;
        }

        m_result->details = ReadFabricModInfo(file.readAll());
        file.close();
        zip.close();
        return;
    }
    else if (zip.setCurrentFile("quilt.mod.json"))
    {
        if (!file.open(QIODevice::ReadOnly))
        {
            zip.close();
            return;
        }

        m_result->details = ReadQuiltModInfo(file.readAll());
        file.close();
        zip.close();
        return;

    }
    else if (zip.setCurrentFile("forgeversion.properties"))
    {
        if (!file.open(QIODevice::ReadOnly))
        {
            zip.close();
            return;
        }

        m_result->details = ReadForgeInfo(file.readAll());
        file.close();
        zip.close();
        return;
    }

    zip.close();
}

void LocalModParseTask::processAsFolder()
{
    QFileInfo mcmod_info(FS::PathCombine(m_modFile.filePath(), "mcmod.info"));
    if (mcmod_info.isFile())
    {
        QFile mcmod(mcmod_info.filePath());
        if (!mcmod.open(QIODevice::ReadOnly))
            return;
        auto data = mcmod.readAll();
        if (data.isEmpty() || data.isNull())
            return;
        m_result->details = ReadMCModInfo(data);
    }
}

void LocalModParseTask::processAsLitemod()
{
    QuaZip zip(m_modFile.filePath());
    if (!zip.open(QuaZip::mdUnzip))
        return;

    QuaZipFile file(&zip);

    if (zip.setCurrentFile("litemod.json"))
    {
        if (!file.open(QIODevice::ReadOnly))
        {
            zip.close();
            return;
        }

        m_result->details = ReadLiteModInfo(file.readAll());
        file.close();
    }
    zip.close();
}

void LocalModParseTask::run()
{
    switch(m_type)
    {
        case Mod::MOD_ZIPFILE:
            processAsZip();
            break;
        case Mod::MOD_FOLDER:
            processAsFolder();
            break;
        case Mod::MOD_LITEMOD:
            processAsLitemod();
            break;
        default:
            break;
    }
    emit finished(m_token);
}