using System;
using System.Collections.Generic;
using System.Text;

namespace CSharpUnitTesting
{
    public class Book
    {
        // Attributes
        private List<BookChapter> _chapters;

        // Constructors
        public Book()
        {
            _chapters = new List<BookChapter>();
        }

        public Book(IEnumerable<BookChapter> chapters)
        {
            _chapters = new List<BookChapter>(chapters);
        }

        // Properties

        // Methods
        public void AddChapter(string title, int pages, int words)
        {
            _chapters.Add(new BookChapter(title, pages, words));
        }

        public bool GetChapter(string title, out BookChapter chapter)
        {
            chapter = _chapters.Find((c) => c.GetTitle() == title);
            return chapter != null;         
        }

        public int GetChapterCount()
        {
            return _chapters.Count;
        }

        public int GetPageCount()
        {
            int pageCount = 0;
            _chapters.ForEach((c) => pageCount += c.GetPages());
            return pageCount;
        }

        public int GetWordCount()
        {
            int wordCount = 0;
            _chapters.ForEach((c) => wordCount += c.GetWordCount());
            return wordCount;
        }

        public double GetAverageWordsPerChapter()
        {
            // There is a bug here...write a test to find it
            return GetWordCount() / GetChapterCount();
        }
    }
}