package world.bentobox.challenges.panel.admin;


import java.util.List;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.World;

import world.bentobox.bentobox.api.panels.PanelItem;
import world.bentobox.bentobox.api.panels.builders.PanelBuilder;
import world.bentobox.bentobox.api.panels.builders.PanelItemBuilder;
import world.bentobox.bentobox.api.user.User;
import world.bentobox.challenges.ChallengesAddon;
import world.bentobox.challenges.database.object.ChallengeLevel;
import world.bentobox.challenges.panel.CommonGUI;
import world.bentobox.challenges.panel.util.ConfirmationGUI;
import world.bentobox.challenges.utils.GuiUtils;


/**
 * This class creates GUI that lists all Levels. Clicking on Level icon will be processed
 * by input mode.
 */
public class ListLevelsGUI extends CommonGUI
{
    // ---------------------------------------------------------------------
    // Section: Constructor
    // ---------------------------------------------------------------------


    /**
     * @param addon Addon where panel operates.
     * @param world World from which panel was created.
     * @param user User who created panel.
     * @param topLabel Command top label which creates panel (f.e. island or ai)
     * @param permissionPrefix Command permission prefix (f.e. bskyblock.)
     * @param mode - mode that indicate what should do icon clicking.
     */
    public ListLevelsGUI(ChallengesAddon addon,
            World world,
            User user,
            Mode mode,
            String topLabel,
            String permissionPrefix)
    {
        this(addon, world, user, mode, topLabel, permissionPrefix, null);
    }


    /**
     * @param addon Addon where panel operates.
     * @param world World from which panel was created.
     * @param user User who created panel.
     * @param topLabel Command top label which creates panel (f.e. island or ai)
     * @param permissionPrefix Command permission prefix (f.e. bskyblock.)
     * @param mode - mode that indicate what should do icon clicking.
     */
    public ListLevelsGUI(ChallengesAddon addon,
            World world,
            User user,
            Mode mode,
            String topLabel,
            String permissionPrefix,
            CommonGUI parentGUI)
    {
        super(addon, world, user, topLabel, permissionPrefix, parentGUI);
        this.currentMode = mode;
    }


    // ---------------------------------------------------------------------
    // Section: Methods
    // ---------------------------------------------------------------------


    /**
     * {@inheritDoc}
     */
    @Override
    public void build()
    {
        PanelBuilder panelBuilder = new PanelBuilder().user(this.user).name(
                this.user.getTranslation("challenges.gui.title.admin.choose-level-title"));

        if (this.currentMode.equals(Mode.DELETE))
        {
            GuiUtils.fillBorder(panelBuilder, Material.RED_STAINED_GLASS_PANE);
        }
        else
        {
            GuiUtils.fillBorder(panelBuilder);
        }

        List<ChallengeLevel> levelList = this.addon.getChallengesManager().getLevels(this.world);

        final int MAX_ELEMENTS = 21;

        if (this.pageIndex < 0)
        {
            this.pageIndex = levelList.size() / MAX_ELEMENTS;
        }
        else if (this.pageIndex > (levelList.size() / MAX_ELEMENTS))
        {
            this.pageIndex = 0;
        }

        int levelIndex = MAX_ELEMENTS * this.pageIndex;

        // I want first row to be only for navigation and return button.
        int index = 10;

        while (levelIndex < ((this.pageIndex + 1) * MAX_ELEMENTS) &&
                levelIndex < levelList.size() &&
                index < 36)
        {
            if (!panelBuilder.slotOccupied(index))
            {
                panelBuilder.item(index, this.createLevelIcon(levelList.get(levelIndex++)));
            }

            index++;
        }

        // Navigation buttons only if necessary
        if (levelList.size() > MAX_ELEMENTS)
        {
            panelBuilder.item(18, this.getButton(CommonButtons.PREVIOUS));
            panelBuilder.item(26, this.getButton(CommonButtons.NEXT));
        }

        panelBuilder.item(44, this.returnButton);

        panelBuilder.build();
    }


    /**
     * This method creates button for given level
     * @param challengeLevel Level which button must be created.
     * @return Level button.
     */
    private PanelItem createLevelIcon(ChallengeLevel challengeLevel)
    {
        PanelItemBuilder itemBuilder = new PanelItemBuilder().
                name(ChatColor.translateAlternateColorCodes('&', challengeLevel.getFriendlyName())).
                description(GuiUtils.stringSplit(
                        this.generateLevelDescription(challengeLevel, this.user.getPlayer()),
                        this.addon.getChallengesSettings().getLoreLineLength())).
                icon(challengeLevel.getIcon()).
                glow(false);

        if (this.currentMode.equals(Mode.EDIT))
        {
            itemBuilder.clickHandler((panel, user1, clickType, i) -> {
                new EditLevelGUI(this.addon,
                        this.world,
                        this.user,
                        challengeLevel,
                        this.topLabel,
                        this.permissionPrefix,
                        this).build();
                return true;
            });
        }
        else if (this.currentMode.equals(Mode.DELETE))
        {
            itemBuilder.clickHandler((panel, user1, clickType, i) -> {
                new ConfirmationGUI(this.user, value -> {
                    if (value)
                    {
                        this.addon.getChallengesManager().
                        deleteChallengeLevel(challengeLevel);
                    }

                    this.build();
                });
                return true;
            });
        }

        return itemBuilder.build();
    }


    // ---------------------------------------------------------------------
    // Section: Enums
    // ---------------------------------------------------------------------


    /**
     * Mode in which gui icons should processed.
     */
    public enum Mode
    {
        EDIT,
        DELETE
    }


    // ---------------------------------------------------------------------
    // Section: Variables
    // ---------------------------------------------------------------------

    /**
     * Current mode in which icons will act.
     */
    private Mode currentMode;
}