package com.kasetoatz.dacl;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.kasetoatz.dacl.options.AbstractInputOption;
import com.kasetoatz.dacl.options.AbstractOption;
import com.kasetoatz.dacl.ui.ConfigScreen;
import net.fabricmc.loader.api.FabricLoader;
import net.minecraft.client.gui.screen.Screen;
import net.minecraft.text.Text;
import net.minecraft.util.crash.CrashException;
import net.minecraft.util.crash.CrashReport;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;

public class DumbassConfig
{
    public static int TEXT_LEFT = 20;
    public static int TEXT_WIDTH = 200;
    public static int TEXT_HEIGHT = 40;
    public static int OPTION_RIGHT = 100;
    public static int OPTION_WIDTH = 80;
    public static int OPTION_HEIGHT = 40;
    public static int ENTRY_HEIGHT = 50;
    public static int DONE_BUTTON_WIDTH = 200;
    public static int BOOLEAN_TRUE_COLOR = 0x00FF00;
    public static int BOOLEAN_FALSE_COLOR = 0xFF0000;
    public static int VALID_INPUT_COLOR = 0xFFFFFFFF;
    public static int INVALID_INPUT_COLOR = 0xFFFF0000;
    public static int BACKGROUND_COLOR_1 = 0x50555555;
    public static int BACKGROUND_COLOR_2 = 0x50333333;

    private final ArrayList<AbstractOption<?>> options = new ArrayList<>();
    private ConfigScreen ui;
    private final Path file;
    private final Gson gson = new GsonBuilder().setPrettyPrinting().create();

    private DumbassConfig(String filename)
    {
        this.file = FabricLoader.getInstance().getConfigDir().resolve(filename.endsWith(".json") ? filename : filename + ".json");
    }

    public Screen getUI(Screen parent)
    {
        this.ui.setParent(parent);
        return this.ui;
    }

    private void load()
    {
        if (!Files.exists(this.file))
        {
            this.save();
            return;
        }
        try
        {
            String json = Files.readString(this.file);
            JsonObject data = this.gson.fromJson(json, JsonObject.class);
            for (AbstractOption<?> option : this.options)
            {
                if (data.has(option.getKey()))
                {
                    JsonElement value = data.get(option.getKey());
                    if (option instanceof AbstractInputOption<?> inputOption && !inputOption.isValid(value))
                    {
                        option.reset();
                        continue;
                    }
                    option.fromJson(data.get(option.getKey()));
                }
            }
            this.save();
        }
        catch (IOException exc)
        {
            throw new CrashException(CrashReport.create(exc, "Loading config file."));
        }
    }

    public void save()
    {
        try
        {
            JsonObject data = new JsonObject();
            for (AbstractOption<?> option : this.options)
            {
                data.add(option.getKey(), this.gson.toJsonTree(option.getValue()));
            }
            Files.writeString(this.file, this.gson.toJson(data));
        }
        catch (IOException exc)
        {
            throw new CrashException(CrashReport.create(exc, "Saving config file."));
        }
    }

    public static Builder builder(Text uiTitle, String filename)
    {
        return new Builder(uiTitle, filename);
    }

    public static class Builder
    {
        private final DumbassConfig config;
        private final Text uiTitle;

        private Builder(Text uiTitle, String filename)
        {
            this.config = new DumbassConfig(filename);
            this.uiTitle = uiTitle;
        }

        public Builder withOption(AbstractOption<?> option)
        {
            this.config.options.add(option);
            return this;
        }

        public DumbassConfig build()
        {
            this.config.load();
            this.config.ui = new ConfigScreen(uiTitle, this.config.options);
            this.config.ui.setSaveCallback(this.config::save);
            return this.config;
        }
    }
}