using System;
using System.Collections.Generic;
using System.Text;
using Substrate.Nbt;
using Substrate.Core;

namespace Substrate
{
    /// <summary>
    /// Represents a TileTick record, which is used to queue a block for processing in the future.
    /// </summary>
    public class TileTick : INbtObject<TileTick>, ICopyable<TileTick>
    {
        private static readonly SchemaNodeCompound _schema = new SchemaNodeCompound("")
        {
            new SchemaNodeScaler("i", TagType.TAG_INT),
            new SchemaNodeScaler("t", TagType.TAG_INT),
            new SchemaNodeScaler("x", TagType.TAG_INT),
            new SchemaNodeScaler("y", TagType.TAG_INT),
            new SchemaNodeScaler("z", TagType.TAG_INT),
        };

        private int _blockId;
        private int _ticks;
        private int _x;
        private int _y;
        private int _z;

        private TagNodeCompound _source;

        /// <summary>
        /// Constructs an empty <see cref="TileTick"/> object.
        /// </summary>
        public TileTick ()
        {
        }

        /// <summary>
        /// Constructs a <see cref="TileTick"/> by copying an existing one.
        /// </summary>
        /// <param name="tt">The <see cref="TileTick"/> to copy.</param>
        public TileTick (TileTick tt)
        {
            _blockId = tt._blockId;
            _ticks = tt._ticks;
            _x = tt._x;
            _y = tt._y;
            _z = tt._z;

            if (tt._source != null) {
                _source = tt._source.Copy() as TagNodeCompound;
            }
        }

        /// <summary>
        /// Gets or sets the ID (type) of the block that this <see cref="TileTick"/> is associated with.
        /// </summary>
        public int ID
        {
            get { return _blockId; }
            set { _blockId = value; }
        }

        /// <summary>
        /// Gets or sets the number of ticks remaining until the associated block is processed.
        /// </summary>
        public int Ticks
        {
            get { return _ticks; }
            set { _ticks = value; }
        }

        /// <summary>
        /// Gets or sets the global X-coordinate of the block that this <see cref="TileTick"/> is associated with.
        /// </summary>
        public int X
        {
            get { return _x; }
            set { _x = value; }
        }

        /// <summary>
        /// Gets or sets the global Y-coordinate of the block that this <see cref="TileTick"/> is associated with.
        /// </summary>
        public int Y
        {
            get { return _y; }
            set { _y = value; }
        }

        /// <summary>
        /// Gets or sets the global Z-coordinate of the block that this <see cref="TileTick"/> is associated with.
        /// </summary>
        public int Z
        {
            get { return _z; }
            set { _z = value; }
        }

        /// <summary>
        /// Checks whether the <see cref="TileTick"/> is located (associated with a block) at the specific global coordinates.
        /// </summary>
        /// <param name="x">The global X-coordinate to test.</param>
        /// <param name="y">The global Y-coordinate to test.</param>
        /// <param name="z">The global Z-coordinate to test.</param>
        /// <returns>Status indicating whether the <see cref="TileTick"/> is located at the specified global coordinates.</returns>
        public bool LocatedAt (int x, int y, int z)
        {
            return _x == x && _y == y && _z == z;
        }

        /// <summary>
        /// Moves the <see cref="TileTick"/> by given block offsets.
        /// </summary>
        /// <param name="diffX">The X-offset to move by, in blocks.</param>
        /// <param name="diffY">The Y-offset to move by, in blocks.</param>
        /// <param name="diffZ">The Z-offset to move by, in blocks.</param>
        public virtual void MoveBy (int diffX, int diffY, int diffZ)
        {
            _x += diffX;
            _y += diffY;
            _z += diffZ;
        }

        /// <summary>
        /// Attempt to construct a new <see cref="TileTick"/> from a Tile Entity subtree without validation.
        /// </summary>
        /// <param name="tree">The root node of a <see cref="TileTick"/> subtree.</param>
        /// <returns>A new <see cref="TileTick"/> on success, or null if the tree was unparsable.</returns>
        public static TileTick FromTree (TagNode tree)
        {
            return new TileTick().LoadTree(tree);
        }

        /// <summary>
        /// Attempt to construct a new <see cref="TileTick"/> from a Tile Entity subtree with validation.
        /// </summary>
        /// <param name="tree">The root node of a <see cref="TileTick"/> subtree.</param>
        /// <returns>A new <see cref="TileTick"/> on success, or null if the tree failed validation.</returns>
        public static TileTick FromTreeSafe (TagNode tree)
        {
            return new TileTick().LoadTreeSafe(tree);
        }

        #region INbtObject<TileTick> Members

        /// <summary>
        /// Gets a <see cref="SchemaNode"/> representing the basic schema of a <see cref="TileTick"/>.
        /// </summary>
        public static SchemaNodeCompound Schema
        {
            get { return _schema; }
        }

        /// <summary>
        /// Attempt to load a <see cref="TileTick"/> subtree into the <see cref="TileTick"/> without validation.
        /// </summary>
        /// <param name="tree">The root node of a <see cref="TileTick"/> subtree.</param>
        /// <returns>The <see cref="TileTick"/> returns itself on success, or null if the tree was unparsable.</returns>
        public TileTick LoadTree (TagNode tree)
        {
            TagNodeCompound ctree = tree as TagNodeCompound;
            if (ctree == null) {
                return null;
            }

            _blockId = ctree["i"].ToTagInt();
            _ticks = ctree["t"].ToTagInt();
            _x = ctree["x"].ToTagInt();
            _y = ctree["y"].ToTagInt();
            _z = ctree["z"].ToTagInt();

            _source = ctree.Copy() as TagNodeCompound;

            return this;
        }

        /// <summary>
        /// Attempt to load a <see cref="TileTick"/> subtree into the <see cref="TileTick"/> with validation.
        /// </summary>
        /// <param name="tree">The root node of a <see cref="TileTick"/> subtree.</param>
        /// <returns>The <see cref="TileTick"/> returns itself on success, or null if the tree failed validation.</returns>
        public TileTick LoadTreeSafe (TagNode tree)
        {
            if (!ValidateTree(tree)) {
                return null;
            }

            return LoadTree(tree);
        }

        /// <summary>
        /// Builds a <see cref="TileTick"/> subtree from the current data.
        /// </summary>
        /// <returns>The root node of a <see cref="TileTick"/> subtree representing the current data.</returns>
        public TagNode BuildTree ()
        {
            TagNodeCompound tree = new TagNodeCompound();
            tree["i"] = new TagNodeInt(_blockId);
            tree["t"] = new TagNodeInt(_ticks);
            tree["x"] = new TagNodeInt(_x);
            tree["y"] = new TagNodeInt(_y);
            tree["z"] = new TagNodeInt(_z);

            if (_source != null) {
                tree.MergeFrom(_source);
            }

            return tree;
        }

        /// <summary>
        /// Validate a <see cref="TileTick"/> subtree against a basic schema.
        /// </summary>
        /// <param name="tree">The root node of a <see cref="TileTick"/> subtree.</param>
        /// <returns>Status indicating whether the tree was valid against the internal schema.</returns>
        public bool ValidateTree (TagNode tree)
        {
            return new NbtVerifier(tree, _schema).Verify();
        }

        #endregion

        #region ICopyable<TileTick> Members

        /// <summary>
        /// Creates a deep-copy of the <see cref="TileTick"/> including any data defined in a subtype.
        /// </summary>
        /// <returns>A deep-copy of the <see cref="TileTick"/>.</returns>
        public virtual TileTick Copy ()
        {
            return new TileTick(this);
        }

        #endregion
    }
}