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package net.md_5.config;

import java.util.*;

public final class Configuration {

    private static final char SEPARATOR = '.';

    final Map self;

    private final Configuration defaults;

    public Configuration() {
        this(null);
    }

    public Configuration(Configuration defaults) {
        this(new LinkedHashMap(), defaults);
    }

    Configuration(Map map, Configuration defaults) {
        this.self = new LinkedHashMap<>();
        this.defaults = defaults;

        for (Map.Entry entry : map.entrySet()) {
            String key = (entry.getKey() == null) ? "null" : entry.getKey().toString();

            if (entry.getValue() instanceof Map) {
                this.self.put(key, new Configuration((Map) entry.getValue(),
                    (defaults == null) ? null : defaults.getSection(key)));
            } else {
                this.self.put(key, entry.getValue());
            }
        }
    }

    // Waterfall start - Allow configuration objects to be cloned
    public Configuration(Configuration values, Configuration defaults) {
        this(values.self, defaults);
    }
    // Waterfall end

    private Configuration getSectionFor(String path) {
        int index = path.indexOf(SEPARATOR);
        if (index == -1) {
            return this;
        }

        String root = path.substring(0, index);
        Object section = self.get(root);
        if (section == null) {
            section = new Configuration((defaults == null) ? null : defaults.getSection(path));
            self.put(root, section);
        }

        return (Configuration) section;
    }

    private String getChild(String path) {
        int index = path.indexOf(SEPARATOR);
        return (index == -1) ? path : path.substring(index + 1);
    }

    /*------------------------------------------------------------------------*/
    @SuppressWarnings("unchecked")
    public  T get(String path, T def) {
        Configuration section = getSectionFor(path);
        Object val;
        if (section == this) {
            val = self.get(path);
        } else {
            val = section.get(getChild(path), def);
        }

        if (val == null && def instanceof Configuration) {
            self.put(path, def);
        }

        return (val != null) ? (T) val : def;
    }

    public boolean contains(String path) {
        return get(path, null) != null;
    }

    public Object get(String path) {
        return get(path, getDefault(path));
    }

    public Object getDefault(String path) {
        return (defaults == null) ? null : defaults.get(path);
    }

    public void set(String path, Object value) {
        if (value instanceof Map) {
            value = new Configuration((Map) value,
                (defaults == null) ? null : defaults.getSection(path));
        }

        Configuration section = getSectionFor(path);
        if (section == this) {
            if (value == null) {
                self.remove(path);
            } else {
                self.put(path, value);
            }
        } else {
            section.set(getChild(path), value);
        }
    }

    public Map getSelf() {
        return self;
    }

    /*------------------------------------------------------------------------*/
    public Configuration getSection(String path) {
        Object def = getDefault(path);
        return (Configuration) get(path, (def instanceof Configuration) ? def
            : new Configuration((defaults == null) ? null : defaults.getSection(path)));
    }

    /**
     * Gets keys, not deep by default.
     *
     * @return top level keys for this section
     */
    public Collection getKeys() {
        return new LinkedHashSet<>(self.keySet());
    }

    /*------------------------------------------------------------------------*/
    public byte getByte(String path) {
        Object def = getDefault(path);
        return getByte(path, (def instanceof Number) ? ((Number) def).byteValue() : 0);
    }

    public byte getByte(String path, byte def) {
        Number val = get(path, def);
        return (val != null) ? val.byteValue() : def;
    }

    public List getByteList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Number) {
                result.add(((Number) object).byteValue());
            }
        }

        return result;
    }

    public short getShort(String path) {
        Object def = getDefault(path);
        return getShort(path, (def instanceof Number) ? ((Number) def).shortValue() : 0);
    }

    public short getShort(String path, short def) {
        Number val = get(path, def);
        return (val != null) ? val.shortValue() : def;
    }

    public List getShortList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Number) {
                result.add(((Number) object).shortValue());
            }
        }

        return result;
    }

    public int getInt(String path) {
        Object def = getDefault(path);
        return getInt(path, (def instanceof Number) ? ((Number) def).intValue() : 0);
    }

    public int getInt(String path, int def) {
        Object val = get(path, def);
        return (val instanceof Number) ? ((Number) val).intValue() : def;
    }

    public List getIntList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Number) {
                result.add(((Number) object).intValue());
            }
        }

        return result;
    }

    public long getLong(String path) {
        Object def = getDefault(path);
        return getLong(path, (def instanceof Number) ? ((Number) def).longValue() : 0);
    }

    public long getLong(String path, long def) {
        Object val = get(path, def);
        return (val instanceof Number) ? ((Number) val).longValue() : def;
    }

    public List getLongList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Number) {
                result.add(((Number) object).longValue());
            }
        }

        return result;
    }

    public float getFloat(String path) {
        Object def = getDefault(path);
        return getFloat(path, (def instanceof Number) ? ((Number) def).floatValue() : 0);
    }

    public float getFloat(String path, float def) {
        Object val = get(path, def);
        return (val instanceof Number) ? ((Number) val).floatValue() : def;
    }

    public List getFloatList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Number) {
                result.add(((Number) object).floatValue());
            }
        }

        return result;
    }

    public double getDouble(String path) {
        Object def = getDefault(path);
        return getDouble(path, (def instanceof Number) ? ((Number) def).doubleValue() : 0);
    }

    public double getDouble(String path, double def) {
        Object val = get(path, def);
        return (val instanceof Number) ? ((Number) val).doubleValue() : def;
    }

    public List getDoubleList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Number) {
                result.add(((Number) object).doubleValue());
            }
        }

        return result;
    }

    public boolean getBoolean(String path) {
        Object def = getDefault(path);
        return getBoolean(path, (def instanceof Boolean) ? (Boolean) def : false);
    }

    public boolean getBoolean(String path, boolean def) {
        Object val = get(path, def);
        return (val instanceof Boolean) ? (Boolean) val : def;
    }

    public List getBooleanList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Boolean) {
                result.add((Boolean) object);
            }
        }

        return result;
    }

    public char getChar(String path) {
        Object def = getDefault(path);
        return getChar(path, (def instanceof Character) ? (Character) def : '\u0000');
    }

    public char getChar(String path, char def) {
        Object val = get(path, def);
        return (val instanceof Character) ? (Character) val : def;
    }

    public List getCharList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof Character) {
                result.add((Character) object);
            }
        }

        return result;
    }

    public String getString(String path) {
        Object def = getDefault(path);
        return getString(path, (def instanceof String) ? (String) def : "");
    }

    public String getString(String path, String def) {
        Object val = get(path, def);
        return (val instanceof String) ? (String) val : def;
    }

    public List getStringList(String path) {
        List list = getList(path);
        List result = new ArrayList<>();

        for (Object object : list) {
            if (object instanceof String) {
                result.add((String) object);
            }
        }

        return result;
    }

    /*------------------------------------------------------------------------*/
    public List getList(String path) {
        Object def = getDefault(path);
        return getList(path, (def instanceof List) ? (List) def : Collections.EMPTY_LIST);
    }

    public List getList(String path, List def) {
        Object val = get(path, def);
        return (val != null) ? (List) val : def;
    }
}