/*
 * Hello Minecraft! Launcher
 * Copyright (C) 2020  huangyuhui <huanghongxun2008@126.com> and contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package org.jackhuang.hmcl.mod;

import com.google.gson.*;
import com.google.gson.annotations.JsonAdapter;
import com.google.gson.annotations.SerializedName;
import org.jackhuang.hmcl.util.Immutable;
import org.jackhuang.hmcl.util.gson.JsonUtils;
import org.jackhuang.hmcl.util.gson.Validation;
import org.jackhuang.hmcl.util.io.CompressingUtils;
import org.jackhuang.hmcl.util.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Type;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Immutable
public class PackMcMeta implements Validation {

    @SerializedName("pack")
    private final PackInfo pack;

    public PackMcMeta() {
        this(new PackInfo());
    }

    public PackMcMeta(PackInfo packInfo) {
        this.pack = packInfo;
    }

    public PackInfo getPackInfo() {
        return pack;
    }

    @Override
    public void validate() throws JsonParseException {
        if (pack == null)
            throw new JsonParseException("pack cannot be null");
    }

    @JsonAdapter(PackInfoDeserializer.class)
    public static class PackInfo {
        @SerializedName("pack_format")
        private final int packFormat;

        @SerializedName("description")
        private final ModInfo.Description description;

        public PackInfo() {
            this(0, new ModInfo.Description(Collections.emptyList()));
        }

        public PackInfo(int packFormat, ModInfo.Description description) {
            this.packFormat = packFormat;
            this.description = description;
        }

        public int getPackFormat() {
            return packFormat;
        }

        public ModInfo.Description getDescription() {
            return description;
        }
    }

    public static class PackInfoDeserializer implements JsonDeserializer<PackInfo> {

        private String parseText(JsonElement json) throws JsonParseException {
            if (json.isJsonPrimitive()) {
                JsonPrimitive primitive = json.getAsJsonPrimitive();
                if (primitive.isBoolean()) {
                    return Boolean.toString(primitive.getAsBoolean());
                } else if (primitive.isNumber()) {
                    return primitive.getAsNumber().toString();
                } else if (primitive.isString()) {
                    return primitive.getAsString();
                } else {
                    throw new JsonParseException("pack.mcmeta text not boolean nor number nor string???");
                }
            } else if (json.isJsonArray()) {
                JsonArray arr = json.getAsJsonArray();
                if (arr.size() == 0) {
                    return "";
                } else {
                    return parseText(arr.get(0));
                }
            } else {
                throw new JsonParseException("pack.mcmeta text should be a string, a boolean, a number or a list of raw JSON text components");
            }
        }

        public ModInfo.Description.Part deserialize(JsonElement json, JsonDeserializationContext context) throws JsonParseException {
            if (json.isJsonPrimitive()) {
                return new ModInfo.Description.Part(parseText(json));
            } else if (json.isJsonObject()) {
                JsonObject obj = json.getAsJsonObject();
                String text = parseText(obj.get("text"));
                return new ModInfo.Description.Part(text);
            } else {
                throw new JsonParseException("pack.mcmeta Raw JSON text should be string or an object");
            }
        }

        @Override
        public PackInfo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
            List<ModInfo.Description.Part> parts = new ArrayList<>();
            JsonObject packInfo = json.getAsJsonObject();
            int packFormat = packInfo.get("pack_format").getAsInt();
            JsonElement description = packInfo.get("description");
            if (description.isJsonPrimitive()) {
                parts.add(new ModInfo.Description.Part(parseText(description)));
            } else if (description.isJsonArray()) {
                for (JsonElement element : description.getAsJsonArray()) {
                    JsonObject descriptionPart = element.getAsJsonObject();
                    parts.add(new ModInfo.Description.Part(descriptionPart.get("text").getAsString(), descriptionPart.get("color").getAsString()));
                }
            } else {
                throw new JsonParseException("pack.mcmeta::pack::description should be String or array of text objects with text and color fields");
            }
            return new PackInfo(packFormat, new ModInfo.Description(parts));
        }
    }

    public static ModInfo fromFile(ModManager modManager, File modFile) throws IOException, JsonParseException {
        try (FileSystem fs = CompressingUtils.createReadOnlyZipFileSystem(modFile.toPath())) {
            Path mcmod = fs.getPath("pack.mcmeta");
            if (Files.notExists(mcmod))
                throw new IOException("File " + modFile + " is not a resource pack.");
            PackMcMeta metadata = JsonUtils.fromNonNullJson(FileUtils.readText(mcmod), PackMcMeta.class);
            return new ModInfo(modManager, modFile, FileUtils.getNameWithoutExtension(modFile), metadata.pack.description, "", "", "", "");
        }
    }
}
