#! /usr/bin/env ruby
# coding: utf-8

# Command 'sculd' can show events and tasks.
# Events include schedule and deadline(start and end).
# Tasks  include deadline, reminder and todo.

SCULD_CONF = "#{ENV['HOME']}/.sculd"

require "pp"
require "optparse"
require "sculd"
require "yaml"

# option analysis
OPTIONS = {}
op = OptionParser.new
op.on("-a day", "--after days" , "Event after n days."){|v|
  OPTIONS[:after] = v.to_i}
op.on("-b day", "--before days", "Event before n days."){|v|
  OPTIONS[:before] = v.to_i}
op.on("-c day", "--center days", "Event days between n days."){|v|
  OPTIONS[:center] = v.to_i}
op.on("-t date", "--till days", "Event till date."){|v|
  OPTIONS[:till] = v}
op.on("-w weekdays", "--weekdays=wdays", "Event days only on weekdays. E.g., --weekday='Sun,Mon'"){|v|
  OPTIONS[:weekdays] = v.split ','}
op.on("-t num", "--task num"  , "Show tasks on today." ){|v|
  OPTIONS[:task ] = v.to_i}
op.parse!(ARGV)


## ~/.sculd check
begin
  configurations = YAML.load_file SCULD_CONF
rescue
  puts "'sculd' command requires ~/.sculd file with YAML format; not directory."
  puts "key as sculd_dir and value as the path to directory should be indicated in ~/.sculd."
  exit
end
sculd_dir = configurations['sculd_dir']

## dates
if ARGV.empty?
  dates = [Date.today]
else
  dates = []
  ARGV.each do |v|
    begin
      date = (Date.parse v)
    rescue ArgumentError
      next
    end
    dates << date
  end
end

if OPTIONS[:till]
  Date.today.upto(Date.parse(OPTIONS[:till])) do |d|
    dates << d
  end
end
#pp dates; exit

if OPTIONS[:center]
  OPTIONS[:after]  ||= OPTIONS[:center]
  OPTIONS[:before] ||= OPTIONS[:center]
end

if OPTIONS[:after]
  results = []
  dates.each do |date|
    0.upto OPTIONS[:after] do |i|
      results << date + i
    end
  end
  dates = results
end

if OPTIONS[:before]
  results = []
  dates.each do |date|
    0.upto OPTIONS[:before] do |i|
      results << date - i
    end
  end
  dates = results
end


if OPTIONS[:weekdays]
  weekdays = OPTIONS[:weekdays].map {|v| Sculd::Plan.wday v}
  dates.select!{|date| weekdays.include? date.wday}
end
#pp dates

dates = dates.sort.uniq

unless FileTest.exist? sculd_dir
  puts "Not found #{sculd_dir}. Exit."
  exit
end

begin
  sm = Sculd::Manager.new(sculd_dir)
  sm.set_weekdays configurations['weekdays'] if configurations['weekdays']
rescue Sculd::Manager::LoadError => message
  puts message
  puts "Exit."
  exit
end
sm.show_events(dates)
sm.show_tasks(OPTIONS[:task ]) if OPTIONS[:task]