#!/usr/bin/env ruby

$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
require 'twhere'
require 'optparse'

config_file = nil

opts = OptionParser.new do |o|
  o.banner = 'usage: twhere [options]'

  o.on('-c', '--config FILE', 'specify config file') do |c|
    config_file = c
  end

  o.on_tail('-h', '--help', 'show this message') do
    $stderr.puts o
    exit
  end

  o.on_tail('-V', '--version', 'show version') do
    version = YAML::load(File.open(File.join(File.dirname(__FILE__), '..', 'VERSION.yml')))
    $stderr.puts "#{version[:major]}.#{version[:minor]}.#{version[:patch]}"
    exit
  end
end

opts.parse!

# make sure the config option was given
unless config_file
  $stderr.puts opts
  exit 1
end

# load config
config = YAML::load(File.open(config_file))

# make sure config was properly loaded
unless config
  $stderr.puts "could not load config from #{config_file}"
  exit 1
end

# make sure these keys are set
[:twhere, :twitter].each do |key|
  unless config[key]
    $stderr.puts "could not find :#{key} in config"
    exit 1
  end
end

# make sure these keys are set
[:locations_file, :template_file].each do |key|
  unless config[:twhere][key]
    $stderr.puts "could not find :#{key} in config"
    exit 1
  end
end

# make sure these keys are set
[:username, :password].each do |key|
  unless config[:twitter][key]
    $stderr.puts "could not find :#{key} in config"
    exit 1
  end
end

# load known locations
locations = YAML::load(File.open(config[:twhere][:locations_file]))

# load template
template = File.read(config[:twhere][:template_file])

# load saved tweets (or don't)
tweets = []
begin
  tweets = YAML::load(File.open(config[:twhere][:tweets_file])) if config[:twhere][:tweets_file]
rescue Errno::ENOENT
end

# create Twhere instance and puts result
twhere = Twhere.new(locations, template, config[:twitter][:username], config[:twitter][:password], tweets)
puts twhere.result

# save tweets to file
File.open(config[:twhere][:tweets_file], 'w') { |f| f.puts tweets.to_yaml } if config[:twhere][:tweets_file]