#!/usr/bin/env ruby

cams = { "SIGMA DP2 Merrill" => "dp2m", "FP2" => "fp2", "Canon EOS 1000D" => "1000d", "iPad Air" => "ipadair" }
cams.default = "default"

ids = []
while line = STDIN.gets # list of files
  a = line.split('.')
  a.pop
  ids << a.join '.'
end
ids.uniq!

used_prefixes = {} # prefix -> 0..N

ids.each do |i|
  exif = `exiv2 #{i}.jpg 2>/dev/null`
  a = exif.split "\n"
  timestamp = nil
  cam = nil
  a.each { |j|
    if j.start_with? "Camera model"
      cam = j
    elsif j.start_with? "Image timestamp"
      timestamp = j
      next
    else
      next
    end
  }
  begin
    t = timestamp.split(':',2)[1].strip.gsub(/(:|\ )/, '-')
    c = cams[cam.split(':',2)[1].strip]
    new_prefix = "#{t}-#{c}"
    add = 1
    while used_prefixes.has_key? new_prefix
      new_prefix = "#{t}-#{add}-#{c}"
      add += 1
    end
    used_prefixes[new_prefix] = true

    Dir.glob("#{i}*").each { |f|
      ext = f.gsub(/^#{i}/,"")
      if File.exists? "#{new_prefix}#{ext}"
        puts "File exists: #{new_prefix}#{ext}, exiting!"
        exit
      end
      `mv #{i}#{ext} #{new_prefix}#{ext}`
    }
  rescue
    puts "Error @#{i}"
  end
end