package com.intellectualcrafters.configuration;

import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Represents a section of a {@link Configuration}
 */
public interface ConfigurationSection {
    /**
     * Gets a set containing all keys in this section.
     * <p>
     * If deep is set to true, then this will contain all the keys within any
     * child {@link ConfigurationSection}s (and their children, etc). These
     * will be in a valid path notation for you to use.
     * <p>
     * If deep is set to false, then this will contain only the keys of any
     * direct children, and not their own children.
     *
     * @param deep Whether or not to get a deep list, as opposed to a shallow
     *     list.
     * @return Set of keys contained within this ConfigurationSection.
     */
    public Set<String> getKeys(final boolean deep);
    
    /**
     * Gets a Map containing all keys and their values for this section.
     * <p>
     * If deep is set to true, then this will contain all the keys and values
     * within any child {@link ConfigurationSection}s (and their children,
     * etc). These keys will be in a valid path notation for you to use.
     * <p>
     * If deep is set to false, then this will contain only the keys and
     * values of any direct children, and not their own children.
     *
     * @param deep Whether or not to get a deep list, as opposed to a shallow
     *     list.
     * @return Map of keys and values of this section.
     */
    public Map<String, Object> getValues(final boolean deep);
    
    /**
     * Checks if this {@link ConfigurationSection} contains the given path.
     * <p>
     * If the value for the requested path does not exist but a default value
     * has been specified, this will return true.
     *
     * @param path Path to check for existence.
     * @return True if this section contains the requested path, either via
     *     default or being set.
     * @throws IllegalArgumentException Thrown when path is null.
     */
    public boolean contains(final String path);
    
    /**
     * Checks if this {@link ConfigurationSection} has a value set for the
     * given path.
     * <p>
     * If the value for the requested path does not exist but a default value
     * has been specified, this will still return false.
     *
     * @param path Path to check for existence.
     * @return True if this section contains the requested path, regardless of
     *     having a default.
     * @throws IllegalArgumentException Thrown when path is null.
     */
    public boolean isSet(final String path);
    
    /**
     * Gets the path of this {@link ConfigurationSection} from its root {@link
     * Configuration}
     * <p>
     * For any {@link Configuration} themselves, this will return an empty
     * string.
     * <p>
     * If the section is no longer contained within its root for any reason,
     * such as being replaced with a different value, this may return null.
     * <p>
     * To retrieve the single name of this section, that is, the final part of
     * the path returned by this method, you may use {@link #getName()}.
     *
     * @return Path of this section relative to its root
     */
    public String getCurrentPath();
    
    /**
     * Gets the name of this individual {@link ConfigurationSection}, in the
     * path.
     * <p>
     * This will always be the final part of {@link #getCurrentPath()}, unless
     * the section is orphaned.
     *
     * @return Name of this section
     */
    public String getName();
    
    /**
     * Gets the root {@link Configuration} that contains this {@link
     * ConfigurationSection}
     * <p>
     * For any {@link Configuration} themselves, this will return its own
     * object.
     * <p>
     * If the section is no longer contained within its root for any reason,
     * such as being replaced with a different value, this may return null.
     *
     * @return Root configuration containing this section.
     */
    public Configuration getRoot();
    
    /**
     * Gets the parent {@link ConfigurationSection} that directly contains
     * this {@link ConfigurationSection}.
     * <p>
     * For any {@link Configuration} themselves, this will return null.
     * <p>
     * If the section is no longer contained within its parent for any reason,
     * such as being replaced with a different value, this may return null.
     *
     * @return Parent section containing this section.
     */
    public ConfigurationSection getParent();
    
    /**
     * Gets the requested Object by path.
     * <p>
     * If the Object does not exist but a default value has been specified,
     * this will return the default value. If the Object does not exist and no
     * default value was specified, this will return null.
     *
     * @param path Path of the Object to get.
     * @return Requested Object.
     */
    public Object get(final String path);
    
    /**
     * Gets the requested Object by path, returning a default value if not
     * found.
     * <p>
     * If the Object does not exist then the specified default value will
     * returned regardless of if a default has been identified in the root
     * {@link Configuration}.
     *
     * @param path Path of the Object to get.
     * @param def The default value to return if the path is not found.
     * @return Requested Object.
     */
    public Object get(final String path, final Object def);
    
    /**
     * Sets the specified path to the given value.
     * <p>
     * If value is null, the entry will be removed. Any existing entry will be
     * replaced, regardless of what the new value is.
     * <p>
     * Some implementations may have limitations on what you may store. See
     * their individual javadocs for details. No implementations should allow
     * you to store {@link Configuration}s or {@link ConfigurationSection}s,
     * please use {@link #createSection(java.lang.String)} for that.
     *
     * @param path Path of the object to set.
     * @param value New value to set the path to.
     */
    public void set(final String path, final Object value);
    
    /**
     * Creates an empty {@link ConfigurationSection} at the specified path.
     * <p>
     * Any value that was previously set at this path will be overwritten. If
     * the previous value was itself a {@link ConfigurationSection}, it will
     * be orphaned.
     *
     * @param path Path to create the section at.
     * @return Newly created section
     */
    public ConfigurationSection createSection(final String path);
    
    /**
     * Creates a {@link ConfigurationSection} at the specified path, with
     * specified values.
     * <p>
     * Any value that was previously set at this path will be overwritten. If
     * the previous value was itself a {@link ConfigurationSection}, it will
     * be orphaned.
     *
     * @param path Path to create the section at.
     * @param map The values to used.
     * @return Newly created section
     */
    public ConfigurationSection createSection(final String path, final Map<?, ?> map);
    
    // Primitives
    /**
     * Gets the requested String by path.
     * <p>
     * If the String does not exist but a default value has been specified,
     * this will return the default value. If the String does not exist and no
     * default value was specified, this will return null.
     *
     * @param path Path of the String to get.
     * @return Requested String.
     */
    public String getString(final String path);
    
    /**
     * Gets the requested String by path, returning a default value if not
     * found.
     * <p>
     * If the String does not exist then the specified default value will
     * returned regardless of if a default has been identified in the root
     * {@link Configuration}.
     *
     * @param path Path of the String to get.
     * @param def The default value to return if the path is not found or is
     *     not a String.
     * @return Requested String.
     */
    public String getString(final String path, final String def);
    
    /**
     * Checks if the specified path is a String.
     * <p>
     * If the path exists but is not a String, this will return false. If the
     * path does not exist, this will return false. If the path does not exist
     * but a default value has been specified, this will check if that default
     * value is a String and return appropriately.
     *
     * @param path Path of the String to check.
     * @return Whether or not the specified path is a String.
     */
    public boolean isString(final String path);
    
    /**
     * Gets the requested int by path.
     * <p>
     * If the int does not exist but a default value has been specified, this
     * will return the default value. If the int does not exist and no default
     * value was specified, this will return 0.
     *
     * @param path Path of the int to get.
     * @return Requested int.
     */
    public int getInt(final String path);
    
    /**
     * Gets the requested int by path, returning a default value if not found.
     * <p>
     * If the int does not exist then the specified default value will
     * returned regardless of if a default has been identified in the root
     * {@link Configuration}.
     *
     * @param path Path of the int to get.
     * @param def The default value to return if the path is not found or is
     *     not an int.
     * @return Requested int.
     */
    public int getInt(final String path, final int def);
    
    /**
     * Checks if the specified path is an int.
     * <p>
     * If the path exists but is not a int, this will return false. If the
     * path does not exist, this will return false. If the path does not exist
     * but a default value has been specified, this will check if that default
     * value is a int and return appropriately.
     *
     * @param path Path of the int to check.
     * @return Whether or not the specified path is an int.
     */
    public boolean isInt(final String path);
    
    /**
     * Gets the requested boolean by path.
     * <p>
     * If the boolean does not exist but a default value has been specified,
     * this will return the default value. If the boolean does not exist and
     * no default value was specified, this will return false.
     *
     * @param path Path of the boolean to get.
     * @return Requested boolean.
     */
    public boolean getBoolean(final String path);
    
    /**
     * Gets the requested boolean by path, returning a default value if not
     * found.
     * <p>
     * If the boolean does not exist then the specified default value will
     * returned regardless of if a default has been identified in the root
     * {@link Configuration}.
     *
     * @param path Path of the boolean to get.
     * @param def The default value to return if the path is not found or is
     *     not a boolean.
     * @return Requested boolean.
     */
    public boolean getBoolean(final String path, final boolean def);
    
    /**
     * Checks if the specified path is a boolean.
     * <p>
     * If the path exists but is not a boolean, this will return false. If the
     * path does not exist, this will return false. If the path does not exist
     * but a default value has been specified, this will check if that default
     * value is a boolean and return appropriately.
     *
     * @param path Path of the boolean to check.
     * @return Whether or not the specified path is a boolean.
     */
    public boolean isBoolean(final String path);
    
    /**
     * Gets the requested double by path.
     * <p>
     * If the double does not exist but a default value has been specified,
     * this will return the default value. If the double does not exist and no
     * default value was specified, this will return 0.
     *
     * @param path Path of the double to get.
     * @return Requested double.
     */
    public double getDouble(final String path);
    
    /**
     * Gets the requested double by path, returning a default value if not
     * found.
     * <p>
     * If the double does not exist then the specified default value will
     * returned regardless of if a default has been identified in the root
     * {@link Configuration}.
     *
     * @param path Path of the double to get.
     * @param def The default value to return if the path is not found or is
     *     not a double.
     * @return Requested double.
     */
    public double getDouble(final String path, final double def);
    
    /**
     * Checks if the specified path is a double.
     * <p>
     * If the path exists but is not a double, this will return false. If the
     * path does not exist, this will return false. If the path does not exist
     * but a default value has been specified, this will check if that default
     * value is a double and return appropriately.
     *
     * @param path Path of the double to check.
     * @return Whether or not the specified path is a double.
     */
    public boolean isDouble(final String path);
    
    /**
     * Gets the requested long by path.
     * <p>
     * If the long does not exist but a default value has been specified, this
     * will return the default value. If the long does not exist and no
     * default value was specified, this will return 0.
     *
     * @param path Path of the long to get.
     * @return Requested long.
     */
    public long getLong(final String path);
    
    /**
     * Gets the requested long by path, returning a default value if not
     * found.
     * <p>
     * If the long does not exist then the specified default value will
     * returned regardless of if a default has been identified in the root
     * {@link Configuration}.
     *
     * @param path Path of the long to get.
     * @param def The default value to return if the path is not found or is
     *     not a long.
     * @return Requested long.
     */
    public long getLong(final String path, final long def);
    
    /**
     * Checks if the specified path is a long.
     * <p>
     * If the path exists but is not a long, this will return false. If the
     * path does not exist, this will return false. If the path does not exist
     * but a default value has been specified, this will check if that default
     * value is a long and return appropriately.
     *
     * @param path Path of the long to check.
     * @return Whether or not the specified path is a long.
     */
    public boolean isLong(final String path);
    
    // Java
    /**
     * Gets the requested List by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return null.
     *
     * @param path Path of the List to get.
     * @return Requested List.
     */
    public List<?> getList(final String path);
    
    /**
     * Gets the requested List by path, returning a default value if not
     * found.
     * <p>
     * If the List does not exist then the specified default value will
     * returned regardless of if a default has been identified in the root
     * {@link Configuration}.
     *
     * @param path Path of the List to get.
     * @param def The default value to return if the path is not found or is
     *     not a List.
     * @return Requested List.
     */
    public List<?> getList(final String path, final List<?> def);
    
    /**
     * Checks if the specified path is a List.
     * <p>
     * If the path exists but is not a List, this will return false. If the
     * path does not exist, this will return false. If the path does not exist
     * but a default value has been specified, this will check if that default
     * value is a List and return appropriately.
     *
     * @param path Path of the List to check.
     * @return Whether or not the specified path is a List.
     */
    public boolean isList(final String path);
    
    /**
     * Gets the requested List of String by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a String if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of String.
     */
    public List<String> getStringList(final String path);
    
    /**
     * Gets the requested List of Integer by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Integer if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Integer.
     */
    public List<Integer> getIntegerList(final String path);
    
    /**
     * Gets the requested List of Boolean by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Boolean if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Boolean.
     */
    public List<Boolean> getBooleanList(final String path);
    
    /**
     * Gets the requested List of Double by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Double if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Double.
     */
    public List<Double> getDoubleList(final String path);
    
    /**
     * Gets the requested List of Float by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Float if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Float.
     */
    public List<Float> getFloatList(final String path);
    
    /**
     * Gets the requested List of Long by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Long if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Long.
     */
    public List<Long> getLongList(final String path);
    
    /**
     * Gets the requested List of Byte by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Byte if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Byte.
     */
    public List<Byte> getByteList(final String path);
    
    /**
     * Gets the requested List of Character by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Character if
     * possible, but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Character.
     */
    public List<Character> getCharacterList(final String path);
    
    /**
     * Gets the requested List of Short by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Short if possible,
     * but may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Short.
     */
    public List<Short> getShortList(final String path);
    
    /**
     * Gets the requested List of Maps by path.
     * <p>
     * If the List does not exist but a default value has been specified, this
     * will return the default value. If the List does not exist and no
     * default value was specified, this will return an empty List.
     * <p>
     * This method will attempt to cast any values into a Map if possible, but
     * may miss any values out if they are not compatible.
     *
     * @param path Path of the List to get.
     * @return Requested List of Maps.
     */
    public List<Map<?, ?>> getMapList(final String path);
    
    /**
     * Gets the requested ConfigurationSection by path.
     * <p>
     * If the ConfigurationSection does not exist but a default value has been
     * specified, this will return the default value. If the
     * ConfigurationSection does not exist and no default value was specified,
     * this will return null.
     *
     * @param path Path of the ConfigurationSection to get.
     * @return Requested ConfigurationSection.
     */
    public ConfigurationSection getConfigurationSection(final String path);
    
    /**
     * Checks if the specified path is a ConfigurationSection.
     * <p>
     * If the path exists but is not a ConfigurationSection, this will return
     * false. If the path does not exist, this will return false. If the path
     * does not exist but a default value has been specified, this will check
     * if that default value is a ConfigurationSection and return
     * appropriately.
     *
     * @param path Path of the ConfigurationSection to check.
     * @return Whether or not the specified path is a ConfigurationSection.
     */
    public boolean isConfigurationSection(final String path);
    
    /**
     * Gets the equivalent {@link ConfigurationSection} from the default
     * {@link Configuration} defined in {@link #getRoot()}.
     * <p>
     * If the root contains no defaults, or the defaults doesn't contain a
     * value for this path, or the value at this path is not a {@link
     * ConfigurationSection} then this will return null.
     *
     * @return Equivalent section in root configuration
     */
    public ConfigurationSection getDefaultSection();
    
    /**
     * Sets the default value in the root at the given path as provided.
     * <p>
     * If no source {@link Configuration} was provided as a default
     * collection, then a new {@link MemoryConfiguration} will be created to
     * hold the new default value.
     * <p>
     * If value is null, the value will be removed from the default
     * Configuration source.
     * <p>
     * If the value as returned by {@link #getDefaultSection()} is null, then
     * this will create a new section at the path, replacing anything that may
     * have existed there previously.
     *
     * @param path Path of the value to set.
     * @param value Value to set the default to.
     * @throws IllegalArgumentException Thrown if path is null.
     */
    public void addDefault(final String path, final Object value);
}