#!/usr/bin/env ruby

$:.unshift(File.expand_path(File.dirname(__FILE__) + '/../lib'))

require File.join(File.dirname(__FILE__), 'trollop')
require 'cossincalc'

opts = Trollop.options do
  version "CosSinCalc Triangle Calculator version #{CosSinCalc::VERSION}"
  banner <<-EOT
Usage: cossincalc [options] [variables]

Variable definitions should follow a certain pattern.
First should be given the name of the variable (ie. a, b, c, A, B or C) immediately followed by an equals sign (=) which is again followed by the actual value of the variable.
Each variable definition should be separated with a space and you should therefore never make whitespace inside a variable definiton.

Examples:
  cossincalc c=5 C=90 a=3
  cossincalc -p 3 A=60 B=60 c=6.2

Options:
EOT
  
  opt :degree,    "Use degrees as the angle unit"
  opt :gon,       "Use gon as the angle unit"
  opt :radian,    "Use radians as the angle unit"
  opt :directory, "The path to the output directory to be created", :default => "cossincalc-calculation-#{Time.now.strftime('%Y-%m-%d')}", :short => '-o'
  opt :precision, "The number of digits to show in the result after the decimal separator", :default => 2
end

sides, angles, angle_opts = {}, {}, {}

[:degree, :gon, :radian].each { |key| angle_opts[key] = opts[key] if opts[key] }
angle_opts.each do |key, value|
  Trollop.die "Only one angle unit is allowed" unless angles[:unit].nil?
  angles[:unit] = key
end

angles[:unit] = :degree if angles[:unit].nil?

ARGV.select { |arg| arg.include?('=') }.each do |arg|
  var, val = *arg.split('=')
  
  if var == var.upcase
    angles[var.downcase.to_sym] = val
  else
    sides[var.to_sym] = val
  end
end

t = CosSinCalc::Triangle.new(sides, angles)
validation = t.calculate!
unless validation == true
  Trollop.die validation.messages.join("  ")[0..-2] # Avoid double-period.
end

begin
  Dir.mkdir(opts[:directory])
rescue Errno::EEXIST
  Trollop.die "The specified directory already exists"
end

filename = File.join(opts[:directory], 'result')
if CosSinCalc::Triangle::Formatter::Latex.new(t.humanize(opts[:precision])).save_pdf(filename)
  puts "Success: The result can be found in #{filename}.pdf."
end