class FifteenPuzzleSolver

# File lib/fifteen_puzzle_solver.rb, line 2
def initialize(params)
  # blocks, width, height, algorithm, acronym
  params.each do |key, value|
    instance_variable_set("@#{key}".to_sym, value)
  end

  validate

  # Initialize board instance
  board = Board.new(@blocks, @width, @height)

  case @algorithm
  when "bfs"
    @solver = BreadthFirstSearch.new(board, @acronym)
  when "dfs"
    @solver = DepthFirstSearch.new(board, @acronym)
  when "astr"
    @solver = AStarSearch.new(board, @acronym)
  end
end

# File lib/fifteen_puzzle_solver.rb, line 23
def perform
  @solver.perform
  @solver.status
end

# File lib/fifteen_puzzle_solver.rb, line 28
def result
  raise Exception.new("First perform algorithm") if @solver.status == "ready"

  @solver
end

# File lib/fifteen_puzzle_solver.rb, line 36
def validate
  # Validate width
  unless @width
    raise Exception.new("Width can't be empty")
  end
  # Validate height
  unless @height
    raise Exception.new("Height can't be empty")
  end
  # Validate if blocks are integers
  if !defined?(@blocks) || !@blocks.is_a?(Array) || !@blocks.all? { |e| e.is_a?(Integer) }
    raise Exception.new("Blocks must be valid array of integers")
  end
  # Validate blocks
  if !@blocks || @blocks.count != @width * @height
    raise Exception.new("Invalid blocks count (should match to height and width)")
  end
  # Validate algorithm
  if !defined?(@algorithm) || !%w[bfs dfs astr].include?(@algorithm)
    raise Exception.new("Empty or invalid algorithm")
  end
  # Valid acronym for bfs or dfs algorithm
  if %w[bfs dfs].include?(@algorithm) && !(/^[udlr]+$/is =~ @acronym)
    raise Exception.new("Invalid acronym for bfs or dfs algorithm")
  end
  # Valid acronym for astr algorithm
  if @algorithm == "astr" && !%w[manh hamm].include?(@acronym)
    raise Exception.new("Invalid acronym for astr algorithm")
  end
end