package io.gitlab.jfronny.libjf.config;

import io.gitlab.jfronny.libjf.LibJf;
import io.gitlab.jfronny.libjf.config.entry.Entry;
import io.gitlab.jfronny.libjf.gson.GsonHidden;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.fabricmc.loader.api.FabricLoader;
import net.minecraft.client.gui.widget.*;
import net.minecraft.text.*;
import net.minecraft.util.Formatting;

import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.regex.Pattern;

/** Based on https://github.com/TeamMidnightDust/MidnightLib which is based on https://github.com/Minenash/TinyConfig
 * Credits to TeamMidnightDust and Minenash */

@SuppressWarnings("unchecked")
public class Config {
    private static final Pattern INTEGER_ONLY = Pattern.compile("(-?[0-9]*)");
    private static final Pattern DECIMAL_ONLY = Pattern.compile("-?([\\d]+\\.?[\\d]*|[\\d]*\\.?[\\d]+|\\.)");

    public final List<EntryInfo> entries = new ArrayList<>();
    public Path path;
    public final String modid;
    public final Class<?> configClass;

    public Config(String modid, Class<?> config) {
        this.modid = modid;
        configClass = config;
        path = FabricLoader.getInstance().getConfigDir().resolve(modid + ".json");

        for (Field field : config.getFields()) {
            EntryInfo info = new EntryInfo();
            info.field = field;
            if (field.isAnnotationPresent(io.gitlab.jfronny.libjf.config.entry.Entry.class))
                try {
                    info.defaultValue = field.get(null);
                } catch (IllegalAccessException ignored) {}
            entries.add(info);
        }
        try {
            LibJf.GSON.fromJson(Files.newBufferedReader(path), config); }
        catch (Exception e) { write(); }
    }

    @Environment(EnvType.CLIENT)
    public void initClient(EntryInfo info) {
        if (!(info.field.isAnnotationPresent(io.gitlab.jfronny.libjf.config.entry.Entry.class) || info.field.isAnnotationPresent(GsonHidden.class))) return;
        Class<?> type = info.field.getType();
        io.gitlab.jfronny.libjf.config.entry.Entry e = info.field.getAnnotation(Entry.class);
        info.width = e != null ? e.width() : 0;

        if (e == null) return;

        if (type == int.class)         textField(info, Integer::parseInt, INTEGER_ONLY, e.min(), e.max(), true);
        else if (type == double.class) textField(info, Double::parseDouble, DECIMAL_ONLY, e.min(), e.max(),false);
        else if (type == String.class) textField(info, String::length, null, Math.min(e.min(),0), Math.max(e.max(),1),true);
        else if (type == boolean.class) {
            Function<Object,Text> func = value -> new LiteralText((Boolean) value ? "True" : "False").formatted((Boolean) value ? Formatting.GREEN : Formatting.RED);
            info.widget = new AbstractMap.SimpleEntry<ButtonWidget.PressAction, Function<Object, Text>>(button -> {
                info.value = !(Boolean) info.value;
                button.setMessage(func.apply(info.value));
            }, func);
        } else if (type.isEnum()) {
            List<?> values = Arrays.asList(info.field.getType().getEnumConstants());
            Function<Object,Text> func = value -> new TranslatableText(modid + ".jfconfig." + "enum." + type.getSimpleName() + "." + info.value.toString());
            info.widget = new AbstractMap.SimpleEntry<ButtonWidget.PressAction, Function<Object,Text>>( button -> {
                int index = values.indexOf(info.value) + 1;
                info.value = values.get(index >= values.size()? 0 : index);
                button.setMessage(func.apply(info.value));
            }, func);
        }

        try {
            info.value = info.field.get(null);
            info.tempValue = info.value.toString();
        } catch (IllegalAccessException ignored) {
        }
    }

    private void textField(EntryInfo info, Function<String,Number> f, Pattern pattern, double min, double max, boolean cast) {
        boolean isNumber = pattern != null;
        info.widget = (BiFunction<TextFieldWidget, ButtonWidget, Predicate<String>>) (t, b) -> s -> {
            s = s.trim();
            if (!(s.isEmpty() || !isNumber || pattern.matcher(s).matches())) return false;

            Number value = 0;
            boolean inLimits = false;
            System.out.println(((isNumber ^ s.isEmpty())));
            System.out.println(!s.equals("-") && !s.equals("."));
            info.error = null;
            if (!(isNumber && s.isEmpty()) && !s.equals("-") && !s.equals(".")) {
                value = f.apply(s);
                inLimits = value.doubleValue() >= min && value.doubleValue() <= max;
                info.error = inLimits? null : new AbstractMap.SimpleEntry<>(t, new LiteralText(value.doubleValue() < min ?
                        "§cMinimum " + (isNumber? "value" : "length") + (cast? " is " + (int)min : " is " + min) :
                        "§cMaximum " + (isNumber? "value" : "length") + (cast? " is " + (int)max : " is " + max)));
            }

            info.tempValue = s;
            t.setEditableColor(inLimits? 0xFFFFFFFF : 0xFFFF7777);
            info.inLimits = inLimits;
            b.active = entries.stream().allMatch(e -> e.inLimits);

            if (inLimits)
                info.value = isNumber? value : s;

            return true;
        };
    }

    public void write() {
        path = FabricLoader.getInstance().getConfigDir().resolve(modid + ".json");
        try {
            if (!Files.exists(path)) Files.createFile(path);
            Files.write(path, LibJf.GSON.toJson(configClass.getDeclaredConstructor().newInstance()).getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}