/*
 * WorldEdit, a Minecraft world manipulation toolkit
 * Copyright (C) sk89q <http://www.sk89q.com>
 * Copyright (C) WorldEdit team and contributors
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.sk89q.jnbt;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * The {@code TAG_Compound} tag.
 */
public class CompoundTag extends Tag {

    private final Map<String, Tag> value;

    /**
     * Creates the tag with an empty name.
     *
     * @param value the value of the tag
     */
    public CompoundTag(Map<String, Tag> value) {
        super();
        this.value = value;
    }

    /**
     * Returns whether this compound tag contains the given key.
     *
     * @param key the given key
     * @return true if the tag contains the given key
     */
    public boolean containsKey(String key) {
        return getValue().containsKey(key);
    }

    @Override
    public Map<String, Tag> getValue() {
        return value;
    }

    /**
     * Return a new compound tag with the given values.
     *
     * @param value the value
     * @return the new compound tag
     */
    public CompoundTag setValue(Map<String, Tag> value) {
        return new CompoundTag(value);
    }

    /**
     * Create a compound tag builder.
     *
     * @return the builder
     */
    public CompoundTagBuilder createBuilder() {
        return new CompoundTagBuilder(new HashMap<>(value));
    }

    /**
     * Get a byte array named with the given key.
     *
     * <p>If the key does not exist or its value is not a byte array tag,
     * then an empty byte array will be returned.</p>
     *
     * @param key the key
     * @return a byte array
     */
    public byte[] getByteArray(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ByteArrayTag) {
            return ((ByteArrayTag) tag).getValue();
        } else {
            return new byte[0];
        }
    }

    /**
     * Get a byte named with the given key.
     *
     * <p>If the key does not exist or its value is not a byte tag,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return a byte
     */
    public byte getByte(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ByteTag) {
            return ((ByteTag) tag).getValue();
        } else {
            return (byte) 0;
        }
    }

    /**
     * Get a double named with the given key.
     *
     * <p>If the key does not exist or its value is not a double tag,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return a double
     */
    public double getDouble(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof DoubleTag) {
            return ((DoubleTag) tag).getValue();
        } else {
            return 0;
        }
    }

    /**
     * Get a double named with the given key, even if it's another
     * type of number.
     *
     * <p>If the key does not exist or its value is not a number,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return a double
     */
    public double asDouble(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ByteTag) {
            return ((ByteTag) tag).getValue();

        } else if (tag instanceof ShortTag) {
            return ((ShortTag) tag).getValue();

        } else if (tag instanceof IntTag) {
            return ((IntTag) tag).getValue();

        } else if (tag instanceof LongTag) {
            return ((LongTag) tag).getValue();

        } else if (tag instanceof FloatTag) {
            return ((FloatTag) tag).getValue();

        } else if (tag instanceof DoubleTag) {
            return ((DoubleTag) tag).getValue();

        } else {
            return 0;
        }
    }

    /**
     * Get a float named with the given key.
     *
     * <p>If the key does not exist or its value is not a float tag,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return a float
     */
    public float getFloat(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof FloatTag) {
            return ((FloatTag) tag).getValue();
        } else {
            return 0;
        }
    }

    /**
     * Get a {@code int[]} named with the given key.
     *
     * <p>If the key does not exist or its value is not an int array tag,
     * then an empty array will be returned.</p>
     *
     * @param key the key
     * @return an int array
     */
    public int[] getIntArray(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof IntArrayTag) {
            return ((IntArrayTag) tag).getValue();
        } else {
            return new int[0];
        }
    }

    /**
     * Get an int named with the given key.
     *
     * <p>If the key does not exist or its value is not an int tag,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return an int
     */
    public int getInt(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof IntTag) {
            return ((IntTag) tag).getValue();
        } else {
            return 0;
        }
    }

    /**
     * Get an int named with the given key, even if it's another
     * type of number.
     *
     * <p>If the key does not exist or its value is not a number,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return an int
     */
    public int asInt(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ByteTag) {
            return ((ByteTag) tag).getValue();

        } else if (tag instanceof ShortTag) {
            return ((ShortTag) tag).getValue();

        } else if (tag instanceof IntTag) {
            return ((IntTag) tag).getValue();

        } else if (tag instanceof LongTag) {
            return ((LongTag) tag).getValue().intValue();

        } else if (tag instanceof FloatTag) {
            return ((FloatTag) tag).getValue().intValue();

        } else if (tag instanceof DoubleTag) {
            return ((DoubleTag) tag).getValue().intValue();

        } else {
            return 0;
        }
    }

    /**
     * Get a list of tags named with the given key.
     *
     * <p>If the key does not exist or its value is not a list tag,
     * then an empty list will be returned.</p>
     *
     * @param key the key
     * @return a list of tags
     */
    public List<Tag> getList(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ListTag) {
            return ((ListTag) tag).getValue();
        } else {
            return Collections.emptyList();
        }
    }

    /**
     * Get a {@code TagList} named with the given key.
     *
     * <p>If the key does not exist or its value is not a list tag,
     * then an empty tag list will be returned.</p>
     *
     * @param key the key
     * @return a tag list instance
     */
    public ListTag getListTag(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ListTag) {
            return (ListTag) tag;
        } else {
            return new ListTag(StringTag.class, Collections.<Tag>emptyList());
        }
    }

    /**
     * Get a list of tags named with the given key.
     *
     * <p>If the key does not exist or its value is not a list tag,
     * then an empty list will be returned. If the given key references
     * a list but the list of of a different type, then an empty
     * list will also be returned.</p>
     *
     * @param key the key
     * @param listType the class of the contained type
     * @return a list of tags
     * @param <T> the type of list
     */
    @SuppressWarnings("unchecked")
    public <T extends Tag> List<T> getList(String key, Class<T> listType) {
        Tag tag = getValue().get(key);
        if (tag instanceof ListTag) {
            ListTag listTag = (ListTag) tag;
            if (listTag.getType().equals(listType)) {
                return (List<T>) listTag.getValue();
            } else {
                return Collections.emptyList();
            }
        } else {
            return Collections.emptyList();
        }
    }

    /**
     * Get a {@code long[]} named with the given key.
     *
     * <p>If the key does not exist or its value is not an long array tag,
     * then an empty array will be returned.</p>
     *
     * @param key the key
     * @return an int array
     */
    public long[] getLongArray(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof LongArrayTag) {
            return ((LongArrayTag) tag).getValue();
        } else {
            return new long[0];
        }
    }

    /**
     * Get a long named with the given key.
     *
     * <p>If the key does not exist or its value is not a long tag,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return a long
     */
    public long getLong(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof LongTag) {
            return ((LongTag) tag).getValue();
        } else {
            return 0L;
        }
    }

    /**
     * Get a long named with the given key, even if it's another
     * type of number.
     *
     * <p>If the key does not exist or its value is not a number,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return a long
     */
    public long asLong(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ByteTag) {
            return ((ByteTag) tag).getValue();

        } else if (tag instanceof ShortTag) {
            return ((ShortTag) tag).getValue();

        } else if (tag instanceof IntTag) {
            return ((IntTag) tag).getValue();

        } else if (tag instanceof LongTag) {
            return ((LongTag) tag).getValue();

        } else if (tag instanceof FloatTag) {
            return ((FloatTag) tag).getValue().longValue();

        } else if (tag instanceof DoubleTag) {
            return ((DoubleTag) tag).getValue().longValue();

        } else {
            return 0L;
        }
    }

    /**
     * Get a short named with the given key.
     *
     * <p>If the key does not exist or its value is not a short tag,
     * then {@code 0} will be returned.</p>
     *
     * @param key the key
     * @return a short
     */
    public short getShort(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof ShortTag) {
            return ((ShortTag) tag).getValue();
        } else {
            return 0;
        }
    }

    /**
     * Get a string named with the given key.
     *
     * <p>If the key does not exist or its value is not a string tag,
     * then {@code ""} will be returned.</p>
     *
     * @param key the key
     * @return a string
     */
    public String getString(String key) {
        Tag tag = getValue().get(key);
        if (tag instanceof StringTag) {
            return ((StringTag) tag).getValue();
        } else {
            return "";
        }
    }

    @Override
    public Map<String, Object> toRaw() {
        HashMap<String, Object> raw = new HashMap<>();
        if (this.value.isEmpty()) return raw;
        for (Map.Entry<String, Tag> entry : value.entrySet()) {
            raw.put(entry.getKey(), entry.getValue().toRaw());
        }
        return raw;
    }

    @Override
    public String toString() {
        StringBuilder bldr = new StringBuilder();
        bldr.append("TAG_Compound").append(": ").append(getValue().size()).append(" entries\r\n{\r\n");
        for (Map.Entry<String, Tag> entry : getValue().entrySet()) {
            bldr.append("   ").append(entry.getValue().toString().replaceAll("\r\n", "\r\n   ")).append("\r\n");
        }
        bldr.append("}");
        return bldr.toString();
    }

}