#!/usr/bin/ruby

VERSION = "2.1.0"
BINARY_NAME = "units"

begin
    args = ARGV.dup
    if args.empty?
       input = STDIN.gets
    else
        input = ""
        args.each do |arg|
            if input != ""
            input = input + " " + arg.dup
            else
                input = arg.dup
            end
        end
    end
    input.strip!
    if input == "-v" or input ==  "--version"
        puts "blaconvert v"+VERSION
        exit
    end
    mid = 0
    from = ""
    to = ""
    num = 0
    words = input.split(" ")
    for i in 0..words.length-1
        if words[i] == "in" or words[i] == "to"
            mid = i
        end
    end
    if words.length == 3 && mid == 0
        num = Float(words[0])
        from = words[1]
        to = words[2]
    elsif words.length == 2 && mid == 0
        num = 1
        from = words[0]
        to = words[1]
    elsif mid > 0
        for i in 1..mid-1
            from += words[i]
        end
        for i in mid+1..words.length-1
            to += words[i]
        end
        num = Float(words[0])
    else
        puts "Invalid input! Try !convert [amount] [from-unit] to [to-unit] e.g !convert 2 cm to inches"
        exit
    end
    if from == "F" && to == "C"
        temp = (num - 32) / 1.8
        puts "#{num} F = #{temp} C"
    elsif from == "C" && to == "F"
        temp = (num * 1.8) + 32
        puts "#{num} C = #{temp} F"
    else
    out = %x(#{BINARY_NAME} -t1 #{from} #{to})
    outs = out.split(" ")
    if outs[0] == "Unknown"
        from.upcase!
        out = %x(#{BINARY_NAME} -t1 #{from} #{to})
        outs = out.split(" ")
        if outs[0] == "Unknown"
            to.upcase!
            out = %x(#{BINARY_NAME} -t1 #{from} #{to})
            outs = out.split(" ")
            if outs[0] == "Unknown"
                puts out
                exit
            end
        end
    elsif outs[0] == "conformability"
        puts "Incompatible units. Can't convert from #{from} to #{to}"
        exit
    end
    puts "#{num} #{from} = #{num * Float(out)} #{to}"
    end    
end