using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;

namespace TransportGame.Model.Road
{
    [XmlRoot("roadNetwork")]
    public class RoadNetwork
    {
        private int lastNodeId = -1, lastSegmentId = -1;

        /// <summary>
        /// Gets or sets the road nodes
        /// </summary>
        [XmlIgnore]
        public Dictionary<int, RoadNode> Nodes { get; private set; }

        /// <summary>
        /// Gets or sets the road segments for the articulation graph
        /// </summary>
        [XmlIgnore]
        public Dictionary<int, RoadSegment> ArticulationSegments { get; private set; }


        /// <summary>
        /// Gets or sets the road segments for the intersection graph
        /// </summary>
        [XmlIgnore]
        public Dictionary<int, RoadSegment> IntersectionSegments { get; private set; }

        /// <summary>
        /// Gets or sets the nodes
        /// </summary>
        [XmlArray("nodes")]
        public RoadNode[] NodesArray
        {
            get
            {
                return Nodes.Values.ToArray();
            }
            set
            {
                Nodes.Clear();
                foreach (var node in value)
                    Nodes.Add(node.Id, node);
            }
        }

        /// <summary>
        /// Gets or sets the segments
        /// </summary>
        [XmlArray("articulationGraph")]
        public RoadSegment[] ArticulationSegmentsArray
        {
            get
            {
                return ArticulationSegments.Values.ToArray();
            }
            set
            {
                ArticulationSegments.Clear();
                foreach (var segment in value)
                    ArticulationSegments.Add(segment.Id, segment);
            }
        }

        /// <summary>
        /// Gets or sets the segments
        /// </summary>
        [XmlArray("intersectionGraph")]
        public RoadSegment[] IntersectionSegmentsArray
        {
            get
            {
                return ArticulationSegments.Values.ToArray();
            }
            set
            {
                ArticulationSegments.Clear();
                foreach (var segment in value)
                    ArticulationSegments.Add(segment.Id, segment);
            }
        }
    
        /// <summary>
        /// Initializes the road network
        /// </summary>
        public RoadNetwork()
        {
            Nodes = new Dictionary<int, RoadNode>();
            ArticulationSegments = new Dictionary<int,RoadSegment>();
            IntersectionSegments = new Dictionary<int,RoadSegment>();
        }

        /// <summary>
        /// Creates a node and returns it
        /// </summary>
        /// <returns>Created node</returns>
        public RoadNode CreateNode()
        {
            // Skip IDs that already exist
            while (Nodes.ContainsKey(++lastNodeId)) ;

            // Create node
            RoadNode node = new RoadNode()
            {
                Id = lastNodeId,
                ParentNetwork = this
            };

            Nodes.Add(node.Id, node);
            return node;
        }

        /// <summary>
        /// Creates a segment and returns it
        /// </summary>
        /// <returns>Created segment</returns>
        public RoadSegment CreateArticulationSegment()
        {
            // Skip IDs that already exist
            while (ArticulationSegments.ContainsKey(++lastSegmentId)) ;

            // Create segment
            RoadSegment segment = new RoadSegment()
            {
                Id = lastSegmentId,
                ParentNetwork = this
            };

            ArticulationSegments.Add(segment.Id, segment);
            return segment;
        }

        /// <summary>
        /// Creates a segment and returns it
        /// </summary>
        /// <returns>Created segment</returns>
        public RoadSegment CreateIntersectionSegment()
        {
            // Skip IDs that already exist
            while (IntersectionSegments.ContainsKey(++lastSegmentId)) ;

            // Create segment
            RoadSegment segment = new RoadSegment()
            {
                Id = lastSegmentId,
                ParentNetwork = this
            };

            IntersectionSegments.Add(segment.Id, segment);
            return segment;
        }
    }
}