#include "levelupdialog.hpp"

#include <MyGUI_Button.h>
#include <MyGUI_EditBox.h>
#include <MyGUI_ImageBox.h>
#include <MyGUI_ScrollView.h>
#include <MyGUI_TextBox.h>

#include <components/fallback/fallback.hpp>
#include <components/widgets/box.hpp>

#include "../mwbase/environment.hpp"
#include "../mwbase/soundmanager.hpp"
#include "../mwbase/windowmanager.hpp"
#include "../mwbase/world.hpp"

#include "../mwworld/class.hpp"
#include "../mwworld/esmstore.hpp"

#include "../mwmechanics/actorutil.hpp"
#include "../mwmechanics/creaturestats.hpp"
#include "../mwmechanics/npcstats.hpp"

#include "class.hpp"
#include "ustring.hpp"

namespace
{
    constexpr unsigned int sMaxCoins = 3;
    constexpr int sColumnOffsets[] = { 32, 218 };
}
namespace MWGui
{
    LevelupDialog::LevelupDialog()
        : WindowBase("openmw_levelup_dialog.layout")
        , mCoinCount(sMaxCoins)
    {
        getWidget(mOkButton, "OkButton");
        getWidget(mClassImage, "ClassImage");
        getWidget(mLevelText, "LevelText");
        getWidget(mLevelDescription, "LevelDescription");
        getWidget(mCoinBox, "Coins");
        getWidget(mAssignWidget, "AssignWidget");

        mOkButton->eventMouseButtonClick += MyGUI::newDelegate(this, &LevelupDialog::onOkButtonClicked);

        {
            const auto& store = MWBase::Environment::get().getESMStore()->get<ESM::Attribute>();
            const size_t perCol
                = static_cast<size_t>(std::ceil(store.getSize() / static_cast<float>(std::size(sColumnOffsets))));
            size_t i = 0;
            for (const ESM::Attribute& attribute : store)
            {
                const int offset = sColumnOffsets[i / perCol];
                const int row = static_cast<int>(i % perCol);
                Widgets widgets;
                widgets.mMultiplier = mAssignWidget->createWidget<MyGUI::TextBox>(
                    "SandTextVCenter", { offset, 20 * row, 100, 20 }, MyGUI::Align::Default);
                auto* hbox = mAssignWidget->createWidget<Gui::HBox>(
                    {}, { offset + 20, 20 * row, 200, 20 }, MyGUI::Align::Default);
                widgets.mButton = hbox->createWidget<Gui::AutoSizedButton>("SandTextButton", {}, MyGUI::Align::Default);
                widgets.mButton->setUserData(attribute.mId);
                widgets.mButton->eventMouseButtonClick += MyGUI::newDelegate(this, &LevelupDialog::onAttributeClicked);
                widgets.mButton->setUserString("TextPadding", "0 0");
                widgets.mButton->setUserString("ToolTipType", "Layout");
                widgets.mButton->setUserString("ToolTipLayout", "AttributeToolTip");
                widgets.mButton->setUserString("Caption_AttributeName", attribute.mName);
                widgets.mButton->setUserString("Caption_AttributeDescription", attribute.mDescription);
                widgets.mButton->setUserString("ImageTexture_AttributeImage", attribute.mIcon);
                widgets.mButton->setCaption(attribute.mName);
                widgets.mValue = hbox->createWidget<Gui::AutoSizedTextBox>("SandText", {}, MyGUI::Align::Default);
                mAttributeWidgets.emplace(attribute.mId, widgets);
                ++i;
            }

            mAssignWidget->setVisibleVScroll(false);
            mAssignWidget->setCanvasSize(MyGUI::IntSize(
                mAssignWidget->getWidth(), std::max(mAssignWidget->getHeight(), static_cast<int>(20 * perCol))));
            mAssignWidget->setVisibleVScroll(true);
            mAssignWidget->setViewOffset(MyGUI::IntPoint());
        }

        for (unsigned int i = 0; i < sMaxCoins; ++i)
        {
            MyGUI::ImageBox* image = mCoinBox->createWidget<MyGUI::ImageBox>(
                "ImageBox", MyGUI::IntCoord(0, 0, 16, 16), MyGUI::Align::Default);
            image->setImageTexture("icons\\tx_goldicon.dds");
            mCoins.push_back(image);
        }

        center();
    }

    void LevelupDialog::setAttributeValues()
    {
        MWWorld::Ptr player = MWBase::Environment::get().getWorld()->getPlayerPtr();
        MWMechanics::CreatureStats& creatureStats = player.getClass().getCreatureStats(player);
        MWMechanics::NpcStats& pcStats = player.getClass().getNpcStats(player);

        for (const ESM::Attribute& attribute : MWBase::Environment::get().getESMStore()->get<ESM::Attribute>())
        {
            int val = creatureStats.getAttribute(attribute.mId).getBase();
            if (std::find(mSpentAttributes.begin(), mSpentAttributes.end(), attribute.mId) != mSpentAttributes.end())
            {
                val += pcStats.getLevelupAttributeMultiplier(attribute.mId);
            }

            if (val >= 100)
                val = 100;

            mAttributeWidgets[attribute.mId].mValue->setCaption(MyGUI::utility::toString(val));
        }
    }

    void LevelupDialog::resetCoins()
    {
        constexpr int coinSpacing = 33;
        int curX = mCoinBox->getWidth() / 2 - (coinSpacing * (mCoinCount - 1) + 16 * mCoinCount) / 2;
        for (unsigned int i = 0; i < sMaxCoins; ++i)
        {
            MyGUI::ImageBox* image = mCoins[i];
            image->detachFromWidget();
            image->attachToWidget(mCoinBox);
            if (i < mCoinCount)
            {
                mCoins[i]->setVisible(true);
                image->setCoord(MyGUI::IntCoord(curX, 0, 16, 16));
                curX += 16 + coinSpacing;
            }
            else
                mCoins[i]->setVisible(false);
        }
    }

    void LevelupDialog::assignCoins()
    {
        resetCoins();
        for (size_t i = 0; i < mSpentAttributes.size(); ++i)
        {
            MyGUI::ImageBox* image = mCoins[i];
            image->detachFromWidget();
            image->attachToWidget(mAssignWidget);

            const auto& attribute = mSpentAttributes[i];
            const auto& widgets = mAttributeWidgets[attribute];

            const int xdiff = widgets.mMultiplier->getCaption().empty() ? 0 : 20;
            const auto* hbox = widgets.mButton->getParent();

            MyGUI::IntPoint pos = hbox->getPosition();
            pos.left -= 22 + xdiff;
            pos.top += (hbox->getHeight() - image->getHeight()) / 2;
            image->setPosition(pos);
        }

        setAttributeValues();
    }

    void LevelupDialog::onOpen()
    {
        MWBase::World* world = MWBase::Environment::get().getWorld();
        MWWorld::Ptr player = world->getPlayerPtr();
        const MWMechanics::CreatureStats& creatureStats = player.getClass().getCreatureStats(player);
        const MWMechanics::NpcStats& pcStats = player.getClass().getNpcStats(player);

        setClassImage(mClassImage,
            ESM::RefId::stringRefId(getLevelupClassImage(pcStats.getSkillIncreasesForSpecialization(0),
                pcStats.getSkillIncreasesForSpecialization(1), pcStats.getSkillIncreasesForSpecialization(2))));

        int level = creatureStats.getLevel() + 1;
        mLevelText->setCaptionWithReplacing("#{sLevelUpMenu1} " + MyGUI::utility::toString(level));

        std::string_view levelupdescription;
        levelupdescription = Fallback::Map::getString("Level_Up_Level" + MyGUI::utility::toString(level));

        if (levelupdescription.empty())
            levelupdescription = Fallback::Map::getString("Level_Up_Default");

        mLevelDescription->setCaption(toUString(levelupdescription));

        unsigned int availableAttributes = 0;
        for (const ESM::Attribute& attribute : MWBase::Environment::get().getESMStore()->get<ESM::Attribute>())
        {
            const auto& widgets = mAttributeWidgets[attribute.mId];
            if (pcStats.getAttribute(attribute.mId).getBase() < 100)
            {
                widgets.mButton->setEnabled(true);
                widgets.mValue->setEnabled(true);
                availableAttributes++;

                float mult = pcStats.getLevelupAttributeMultiplier(attribute.mId);
                mult = std::min(mult, 100 - pcStats.getAttribute(attribute.mId).getBase());
                if (mult <= 1)
                    widgets.mMultiplier->setCaption({});
                else
                    widgets.mMultiplier->setCaption("x" + MyGUI::utility::toString(mult));
            }
            else
            {
                widgets.mButton->setEnabled(false);
                widgets.mValue->setEnabled(false);

                widgets.mMultiplier->setCaption({});
            }
        }

        mCoinCount = std::min(sMaxCoins, availableAttributes);

        mSpentAttributes.clear();
        resetCoins();

        setAttributeValues();

        center();

        // Play LevelUp Music
        MWBase::Environment::get().getSoundManager()->streamMusic("Special/MW_Triumph.mp3");
    }

    void LevelupDialog::onOkButtonClicked(MyGUI::Widget* sender)
    {
        MWWorld::Ptr player = MWMechanics::getPlayer();
        MWMechanics::NpcStats& pcStats = player.getClass().getNpcStats(player);

        if (mSpentAttributes.size() < mCoinCount)
            MWBase::Environment::get().getWindowManager()->messageBox("#{sNotifyMessage36}");
        else
        {
            // increase attributes
            for (unsigned int i = 0; i < mCoinCount; ++i)
            {
                MWMechanics::AttributeValue attribute = pcStats.getAttribute(mSpentAttributes[i]);
                attribute.setBase(attribute.getBase() + pcStats.getLevelupAttributeMultiplier(mSpentAttributes[i]));

                if (attribute.getBase() >= 100)
                    attribute.setBase(100);
                pcStats.setAttribute(mSpentAttributes[i], attribute);
            }

            pcStats.levelUp();

            MWBase::Environment::get().getWindowManager()->removeGuiMode(GM_Levelup);
        }
    }

    void LevelupDialog::onAttributeClicked(MyGUI::Widget* sender)
    {
        auto attribute = *sender->getUserData<ESM::Attribute::AttributeID>();

        auto found = std::find(mSpentAttributes.begin(), mSpentAttributes.end(), attribute);
        if (found != mSpentAttributes.end())
            mSpentAttributes.erase(found);
        else
        {
            if (mSpentAttributes.size() == mCoinCount)
                mSpentAttributes[mCoinCount - 1] = attribute;
            else
                mSpentAttributes.push_back(attribute);
        }
        assignCoins();
    }

    std::string_view LevelupDialog::getLevelupClassImage(
        const int combatIncreases, const int magicIncreases, const int stealthIncreases)
    {
        std::string_view ret = "acrobat";

        int total = combatIncreases + magicIncreases + stealthIncreases;
        if (total == 0)
            return ret;

        int combatFraction = static_cast<int>(static_cast<float>(combatIncreases) / total * 10.f);
        int magicFraction = static_cast<int>(static_cast<float>(magicIncreases) / total * 10.f);
        int stealthFraction = static_cast<int>(static_cast<float>(stealthIncreases) / total * 10.f);

        if (combatFraction > 7)
            ret = "warrior";
        else if (magicFraction > 7)
            ret = "mage";
        else if (stealthFraction > 7)
            ret = "thief";

        switch (combatFraction)
        {
            case 7:
                ret = "warrior";
                break;
            case 6:
                if (stealthFraction == 1)
                    ret = "barbarian";
                else if (stealthFraction == 3)
                    ret = "crusader";
                else
                    ret = "knight";
                break;
            case 5:
                if (stealthFraction == 3)
                    ret = "scout";
                else
                    ret = "archer";
                break;
            case 4:
                ret = "rogue";
                break;
            default:
                break;
        }

        switch (magicFraction)
        {
            case 7:
                ret = "mage";
                break;
            case 6:
                if (combatFraction == 2)
                    ret = "sorcerer";
                else if (combatIncreases == 3)
                    ret = "healer";
                else
                    ret = "battlemage";
                break;
            case 5:
                ret = "witchhunter";
                break;
            case 4:
                ret = "spellsword";
                // In vanilla there's also code for "nightblade", however it seems to be unreachable.
                break;
            default:
                break;
        }

        switch (stealthFraction)
        {
            case 7:
                ret = "thief";
                break;
            case 6:
                if (magicFraction == 1)
                    ret = "agent";
                else if (magicIncreases == 3)
                    ret = "assassin";
                else
                    ret = "acrobat";
                break;
            case 5:
                if (magicIncreases == 3)
                    ret = "monk";
                else
                    ret = "pilgrim";
                break;
            case 3:
                if (magicFraction == 3)
                    ret = "bard";
                break;
            default:
                break;
        }

        return ret;
    }
}