1require 'spec_helper'
 2require 'csv'
 3require 'ostruct'
 4#In weather.dat you’ll find daily weather data for Morristown, NJ for June 2002. 
 5#Download this text file, then write a program to output the day number (column one) 
 6#with the smallest temperature spread (the maximum temperature is the second column, the minimum the third column).
 7
 8class Tuple
 9  include Comparable
10  attr_reader :key, :value
11
12  def initialize(key:, max:, min:)
13    @key = key
14    @value = (max - min).abs
15  end
16
17  def <=>(other)
18    value <=> other.value
19  end
20end
21
22class Team
23  def self.map_from(row)
24    return nil if row[1].nil?
25    Tuple.new(key: row[1], max: row[6].to_i, min: row[8].to_i)
26  end
27end
28
29class Day
30  def self.map_from(row)
31    Tuple.new(key: row[0], max: row[1].to_f, min: row[2].to_f)
32  end
33end
34
35class Spread
36  include Enumerable
37
38  def initialize(filename, mapper)
39    @file_path = File.join(File.dirname(__FILE__), "../fixtures", filename)
40    @mapper = mapper
41  end
42
43  def each
44    open_file do |file|
45      file.each_line.with_index do |line, index|
46        next if index == 0
47        next if line.chomp.empty?
48        row =  mapper.map_from(line.split)
49        next if row.nil?
50        yield row
51      end
52    end
53  end
54
55  private
56
57  def open_file
58    file = File.new(file_path)
59    yield file
60  ensure
61    file.close
62  end
63
64  attr_reader :file_path, :mapper
65end
66
67describe "weather.dat" do
68  subject { Spread.new('weather.dat', Day) }
69
70  it 'returns the day with the smallest temperature spread' do
71    expect(subject.min.key).to eql('14')
72  end
73end
74
75# Part Two: Soccer League Table
76# The file football.dat contains the results from the English Premier League for 2001/2. 
77# The columns labeled ‘F’ and ‘A’ contain the total number of goals scored for and against each team in that season (so Arsenal scored 79 goals against opponents, and had 36 goals scored against them). Write a program to print the name of the team with the smallest difference in ‘for’ and ‘against’ goals.
78#
79describe "football.dat" do
80  subject { Spread.new('football.dat', Team) }
81
82  it 'returns the day with the smallest temperature spread' do
83    expect(subject.min.key).to eql('Aston_Villa')
84  end
85end