#compdef task
#
# Copyright 2010 - 2015 Johannes Schlatow
# Copyright 2009 P.C. Shyamshankar
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# http://www.opensource.org/licenses/mit-license.php
#
typeset -g _task_cmds _task_projects _task_tags _task_config _task_modifiers
_task_projects=($(task _projects))
_task_tags=($(task _tags))
_task_ids=($(task _ids))
_task_zshids=( ${(f)"$(task _zshids)"} )
_task_config=($(task _config))
_task_columns=($(task _columns))
_task_modifiers=(
	'before' \
	'after' \
	'none' \
	'any' \
	'is' \
	'isnt' \
	'has' \
	'hasnt' \
	'startswith' \
	'endswith' \
	'word' \
	'noword'
)
_task_conjunctions=(
   'and' \
   'or' \
	'xor' \
	'\)' \
	'\(' \
	'<' \
	'<=' \
	'=' \
	'!=' \
	'>=' \
	'>'
)
_task_cmds=($(task _commands; task _aliases))
_task_zshcmds=( ${(f)"$(task _zshcommands)"} )

_task_aliases=($(task _aliases))

_task() {
    _arguments -s -S \
        "*::task default:_task_default"
    return 0
}

local -a reply args word
word=$'[^\0]#\0'

# priorities
local -a task_priorities
_regex_words values 'task priorities' \
	'H:High' \
	'M:Middle' \
	'L:Low'
task_priorities=("$reply[@]")

# projects
local -a task_projects
task_projects=(
	/"$word"/
	":values:task projects:compadd -a _task_projects"
)

local -a _task_dates
_regex_words values 'task dates' \
	'tod*ay:Today' \
	'yes*terday:Yesterday' \
	'tom*orrow:Tomorrow' \
	'sow:Start of week' \
	'soww:Start of work week' \
	'socw:Start of calendar week' \
	'som:Start of month' \
	'soq:Start of quarter' \
	'soy:Start of year' \
	'eow:End of week' \
	'eoww:End of work week' \
	'eocw:End of calendar week' \
	'eom:End of month' \
	'eoq:End of quarter' \
	'eoy:End of year' \
	'mon:Monday' \
	'tue:Tuesday'\
	'wed:Wednesday' \
	'thu:Thursday' \
	'fri:Friday' \
	'sat:Saturday' \
	'sun:Sunday' \
  'good*friday:Good Friday' \
  'easter:Easter' \
  'eastermonday:Easter Monday' \
  'ascension:Ascension' \
  'pentecost:Pentecost' \
  'midsommar:Midsommar' \
  'midsommarafton:Midsommarafton' \
  'later:Later' \
  'someday:Some Day'
_task_dates=("$reply[@]")

local -a _task_reldates
_regex_words values 'task reldates' \
	'hrs:n hours' \
	'day:n days' \
	'1st:first' \
	'2nd:second' \
	'3rd:third' \
	'th:4th, 5th, etc.' \
	'wks:weeks'
_task_reldates=("$reply[@]")

task_dates=(
	\( "$_task_dates[@]" \|
    \( /$'[0-9][0-9]#'/- \( "$_task_reldates[@]" \) \)
	\)
)

local -a task_zshids
_regex_words values 'task IDs' $_task_zshids
task_zshids=("$reply[@]")

_regex_words values 'task frequencies' \
	'daily:Every day' \
	'day:Every day' \
	'weekdays:Every day skipping weekend days' \
	'weekly:Every week' \
	'biweekly:Every two weeks' \
	'fortnight:Every two weeks' \
  'monthly:Every month' \
	'quarterly:Every three months' \
	'semiannual:Every six months' \
	'annual:Every year' \
	'yearly:Every year' \
	'biannual:Every two years' \
	'biyearly:Every two years'
_task_freqs=("$reply[@]")

local -a _task_frequencies
_regex_words values 'task frequencies' \
	'd:days' \
	'w:weeks' \
	'q:quarters' \
	'y:years'
_task_frequencies=("$reply[@]")

task_freqs=(
	\( "$_task_freqs[@]" \|
     \( /$'[0-9][0-9]#'/- \( "$_task_frequencies[@]" \) \)
	\)
)

# attributes
local -a task_attributes
_regex_words -t ':' default 'task attributes' \
	'des*cription:Task description text' \
	'status:Status of task - pending, completed, deleted, waiting' \
	'pro*ject:Project name:$task_projects' \
	'pri*ority:priority:$task_priorities' \
	'du*e:Due date:$task_dates' \
	're*cur:Recurrence frequency:$task_freqs' \
	'un*til:Expiration date:$task_dates' \
	'li*mit:Desired number of rows in report' \
	'wa*it:Date until task becomes pending:$task_dates' \
	'ent*ry:Date task was created:$task_dates' \
	'end:Date task was completed/deleted:$task_dates' \
	'st*art:Date task was started:$task_dates' \
	'sc*heduled:Date task is scheduled to start:$task_dates' \
	'dep*ends:Other tasks that this task depends upon:$task_zshids'
task_attributes=("$reply[@]")

args=(
	\( "$task_attributes[@]" \|
	\( /'(project|description|status|entry|end|start|scheduled|depends|due|wait|recur|priority|until|limit).'/- \( /$'[^:]#:'/ ":default:modifiers:compadd -S ':' -a _task_modifiers" \) \) \|
	\( /'(rc).'/- \( /$'[^:]#:'/ ":arguments:config:compadd -S ':' -a _task_config" \) \) \|
	\( /'(+|-)'/- \( /"$word"/ ":values:remove tag:compadd -a _task_tags" \) \) \|
	\( /"$word"/ \)
	\) \#
)
_regex_arguments _task_attributes "${args[@]}"

## task commands

# filter completion
(( $+functions[_task_filter] )) ||
_task_filter() {
	_task_attributes "$@"

	# TODO complete conjunctions only if the previous word is a filter expression, i.e. attribute, ID, any non-command
	_describe -t default 'task conjunctions' _task_conjunctions
}

# execute completion
(( $+functions[_task_execute] )) ||
_task_execute() {
	_files
}

# id-only completion
(( $+functions[_task_id] )) ||
_task_id() {
	_describe -t values 'task IDs' _task_zshids
}

## first level completion => task sub-command completion
(( $+functions[_task_default] )) ||
_task_default() {
    local cmd ret=1

	integer i=1
	while (( i < $#words ))
	do
		cmd="${_task_cmds[(r)$words[$i]]}"
		if (( $#cmd )); then
			_call_function ret _task_${cmd} ||
				_call_function ret _task_filter ||
					_message "No command remaining."
			return ret
		fi
		(( i++ ))
	done

	# update IDs
	_task_zshids=( ${(f)"$(task _zshids)"} )

	_describe -t commands 'task command' _task_zshcmds
	_describe -t values 'task IDs' _task_zshids
	_describe -t aliases 'task aliases' _task_aliases
	_call_function ret _task_filter

	return ret
}
