using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using mapper.attributes;

namespace sharpwawi.models
{
    [MappingConstraintAttribute(FieldMappingConstraint = MappingConstraints.DONTMAP,PropertyMappingConstraint = MappingConstraints.ANNOTATEDONLY)]
    public class PartAssembly
    {
        [Mapped]
        [PrimaryKey]
        public Part Part;

        [Mapped]
        [PrimaryKey]
        public int Revision;

        IList<AssemblyComponent> components = new List<AssemblyComponent>();

        protected PartAssembly()
        {
        }

        internal PartAssembly(Part part)
        {
            Part = part;
            Revision = part.HighestAssemblyRevision + 1;
        }

        public int Count => components.Count;
        public AssemblyComponent this[int n] => components[n];

        public AssemblyComponent this[Part component]{
            get {
                foreach (AssemblyComponent assemblyComponent in components)
                {
                    if (assemblyComponent.Component.Equals(component))
                        return assemblyComponent;
                }
                throw new IndexOutOfRangeException();
            }
        }

        public bool ContainsComponent(Part component){
            foreach (AssemblyComponent assemblyComponent in components){
                if (assemblyComponent.Component.Equals(component))
                    return true;
            }
            return false;
        }

        public PartAssembly Clone(){
            PartAssembly clone = Part.CreateAssembly();

            foreach (AssemblyComponent assemblyComponent in components)
                clone.AddComponent(assemblyComponent.Component, assemblyComponent.Quantity);

            return clone;
        }


        /**
         * Add a qunatity of a component to the Assembly.
         * Returns true if the component is new to the assembly, false if just the quantity changed
         * 
         **/
        public bool AddComponent(Part component, double quantity)
        {
            if (ContainsComponent(component))
            {
                this[component].Quantity += quantity;
                return false;
            } else {
                components.Add(new AssemblyComponent(this, component, quantity));
                return true;
            }
        }

        public void RemoveComponent(AssemblyComponent component)
        {
            components.Remove(component);
        }
        public void RemoveComponent(Part component){
            RemoveComponent(this[component]);
        }

    }
}