local yesno = require('Module:Yesno')
local checkType = require('libraryUtil').checkType

local SHOW_WARNINGS = false
local INPUT_ERROR_CATEGORY = '입력 오류가 있는 곡 목록'
local COLLAPSED_PARAMETER_CATEGORY = '숨김 변수를 사용하는 곡 목록 '

-- 로컬 변수 보관을 위해 사용
local localArgs

-- Helper functions

-- Add a mixin to a class.
local function addMixin
	for k, v in pairs(mixin) do
		if k ~= 'init' then
			class[k] = v
		end
	end
end

-- Validation mixin

local Validation = {}

function Validation.init(self)
	self.warnings = {}
	self.categories = {}
end

function Validation:addWarning
	table.insert
	table.insert
end

function Validation:addCategory(category)
	table.insert
end

function Validation:getWarnings
	return self.warnings
end

function Validation:getCategories
	return self.categories
end

-- Validate a track length. If a track length is invalid, a warning is added.
-- A type error is raised if the length is not of type string or nil.
function Validation:validateLength(length)
	checkType
	if length == nil then
		-- Do nothing if no length specified
		return nil
	end

	local hours, minutes, seconds

	-- Try to match times like "1:23:45".
	hours, minutes, seconds = length:match('^(%d+):(%d%d):(%d%d)$')
	if hours and hours:sub == '0' then
		-- Disallow times like "0:12:34"
		self:addWarning(string.format(
			"유효하지 않은 시간 '%s' ('h:mm:ss' 형식의 시간은 0으로 시작할 수 없습니다)",
			mw.text.nowiki(length)
		), INPUT_ERROR_CATEGORY)
		return nil
	end

	if not seconds then
		-- The previous attempt didn't match. Try to match times like "1:23".
		minutes, seconds = length:match('^(%d?%d):(%d%d)$')
		if minutes and minutes:find('^0%d$') then
			-- Special case to disallow lengths like "01:23". This check has to
			-- be here so that lengths like "1:01:23" are still allowed.
			self:addWarning(string.format(
				"유효하지 않은 시간 '%s' ('mm:ss' 형식의 시간은 0으로 시작할 수 없습니다)",
				mw.text.nowiki(length)
			), INPUT_ERROR_CATEGORY)
			return nil
		end
	end

	-- Add a warning and return if we did not find a match.
	if not seconds then
		self:addWarning(string.format(
			"유효하지 않은 시간 '%s' ",
			mw.text.nowiki(length)
		), INPUT_ERROR_CATEGORY)
		return nil
	end

	-- Check that the minutes are less than 60 if we have an hours field.
	if hours and tonumber(minutes) >= 60 then
		self:addWarning(string.format(
			"유효하지 않은 재생 시간 '%s' (시간을 지정하는 경우 분 숫자는 60보다 작아야 합니다)",
			mw.text.nowiki(length)
		), INPUT_ERROR_CATEGORY)
		return nil
	end
	
	-- Check that the seconds are less than 60
	if tonumber(seconds) >= 60 then
		self:addWarning(string.format(
			"유효하지 않은 곡 길이 '%s' (초 숫자는 60보다 작아야 합니다)",
			mw.text.nowiki(length)
		), INPUT_ERROR_CATEGORY)
	end

	return nil
end

-- Track class

local Track = {}
Track.__index = Track
addMixin

Track.fields = {
	number = true,
	title = true,
	note = true,
	length = true,
	lyrics = true,
	music = true,
	writer = true,
	arrangements = true,
	extra = true,

-- 한국어 변수 목록
fieldTranslations = {
	-- Track.fields
	number = '#',
	title = '제목',
	note = '주',
	length = '재생시간',
	lyrics = '작사',
	music = '작곡',
	writer = '작사작곡',
	arrangements = '편곡',
	extra = '기타',
	
	-- TrackListing.fields
	all_writing = '전체작사작곡',
	all_lyrics = '전체작사',
	all_music = '전체작곡',
	all_arrangements = '전체편곡',
	collapsed = '숨김',
	headline = '표제',
	extra_column = '기타정보',
	total_length = '총재생시간',
	title_width = '제목너비',
	writing_width = '작사작곡너비',
	lyrics_width = '작사너비',
	music_width = '작곡너비',
	arrangements_width = '편곡너비',
	extra_width = '추가너비',
	category = '분류',
	
	-- TrackListing.deprecatedFields
	writing_credits = '작사작곡표시',
	lyrics_credits = '작사표시',
	music_credits = '작곡표시',
	arrangements_credits = '편곡표시',

Track.cellMethods = {
	number = 'makeNumberCell',
	title = 'makeTitleCell',
	writer = 'makeWriterCell',
	lyrics = 'makeLyricsCell',
	music = 'makeMusicCell',
	arrangements = 'makeArrangementsCell',
	extra = 'makeExtraCell',
	length = 'makeLengthCell',

function Track.new(data)
	local self = setmetatable
	Validation.init(self)
	for field in pairs(Track.fields) do
		self[field] = data[field]
	end
	self.number = assert(tonumber(self.number))
	self:validateLength(self.length)
	return self
end

function Track:getLyricsCredit
	return self.lyrics
end

function Track:getMusicCredit
	return self.music
end

function Track:getWriterCredit
	return self.writer
end

function Track:getArrangementsCredit
	return self.arrangements
end

function Track:getExtraField
	return self.extra
end

-- Note: called with single dot syntax
function Track.makeSimpleCell(wikitext)
	return mw.html.create('td')
end

function Track:makeNumberCell
	local numberCell = mw.html.create('td')
	numberCell

	-- number 및 #을 사용하는 변수에 대해 트랙 번호를 변경할 수 있도록 조치
	local customNum = localArgs['#' .. self.number] or localArgs['number' .. self.number] or ''
	if (string.len(customNum) > 0) then
		numberCell
	else
		numberCell
	end

	return numberCell
end

function Track:makeTitleCell
	local titleCell = mw.html.create('td')
	titleCell
	if self.note then
		titleCell
	end
	return titleCell
end

function Track:makeWriterCell
	return Track.makeSimpleCell(self.writer)
end

function Track:makeLyricsCell
	return Track.makeSimpleCell(self.lyrics)
end

function Track:makeMusicCell
	return Track.makeSimpleCell(self.music)
end

function Track:makeArrangementsCell
	return Track.makeSimpleCell(self.arrangements)
end

function Track:makeExtraCell
	return Track.makeSimpleCell(self.extra)
end

function Track:makeLengthCell
	return mw.html.create('td')
end

function Track:exportRow(options)
	options = options or {}
	local columns = options.columns or {}
	local row = mw.html.create('tr')
	row:css
	for i, column in ipairs(columns) do
		local method = Track.cellMethods[column]
		if method then
			row:node(self[method](self))
		end
	end
	return row
end

-- TrackListing class

local TrackListing = {}
TrackListing.__index = TrackListing
addMixin

TrackListing.fields = {
	headline = true,
	all_writing = true,
	all_lyrics = true,
	all_music = true,
	all_arrangements = true,
	extra_column = true,
	total_length = true,
	title_width = true,
	writing_width = true,
	lyrics_width = true,
	music_width = true,
	arrangements_width = true,
	extra_width = true,
	category = true,

TrackListing.deprecatedFields = {
	writing_credits = true, --작사작곡표시
	lyrics_credits = true, -- 작사표시
	music_credits = true, -- 작곡표시
	arrangements_credits = true, -- 편곡표시

function translateFields(param)
	if param ~= nil then
		if string.find then
			return param
		end
	
		for k,v in pairs(fieldTranslations) do
			if type(v) == 'table' then
				for _,vv in v do
					if vv == param then
						return k
					end
				end
			elseif v == param then
				return k
			end
		end
	end
	
	return param
end

function TrackListing.new(data)
	local self = setmetatable
	Validation.init(self)

	-- Check for deprecated arguments
	for deprecatedField in pairs(TrackListing.deprecatedFields) do
		if data[deprecatedField] then
			self:addCategory('구식 변수를 사용하는 곡 목록')
			break
		end
	end

	-- Validate total length
	if data.total_length then
		self:validateLength(data.total_length)
	end
	
	-- Add properties
	for field in pairs(TrackListing.fields) do
		self[field] = data[field]
	end
	
	-- Evaluate boolean properties
	self.showCategories = yesno(self.category) ~= false
	self.category = nil

	-- Make track objects
	self.tracks = {}
	for i, trackData in ipairs(data.tracks or {}) do
		table.insert(self.tracks, Track.new(trackData))
	end

	-- Find which of the optional columns we have.
	-- We could just check every column for every track object, but that would
	-- be no fun^H^H^H^H^H^H inefficient, so we use four different strategies
	-- to try and check only as many columns and track objects as necessary.
	do
		local optionalColumns = {}
		local columnMethods = {
			lyrics = 'getLyricsCredit',
			music = 'getMusicCredit',
			writer = 'getWriterCredit',
			arrangements = 'getArrangementsCredit',
			extra = 'getExtraField',
		local doneWriterCheck = false
		for i, trackObj in ipairs(self.tracks) do
			for column, method in pairs(columnMethods) do
				if trackObj[method](trackObj) then
					optionalColumns[column] = true
					columnMethods[column] = nil
				end
			end
			if not doneWriterCheck and optionalColumns.writer then
				doneWriterCheck = true
				optionalColumns.lyrics = nil
				optionalColumns.music = nil
				columnMethods.lyrics = nil
				columnMethods.music = nil
			end
			if not next(columnMethods) then
				break
			end
		end
		self.optionalColumns = optionalColumns
	end

	return self
end

function TrackListing:makeIntro
	if self.all_writing and self.all_arrangements then
		return string.format
	elseif self.all_writing then
		return string.format
	elseif self.all_lyrics and self.all_music and self.all_arrangements then
		return string.format
	elseif self.all_lyrics and self.all_music then
		return string.format
	elseif self.all_lyrics and self.all_arrangements then
		return string.format
	elseif self.all_lyrics then
		return string.format
	elseif self.all_music and self.all_arrangements then
		return string.format
	elseif self.all_music then
		return string.format
	elseif self.all_arrangements then
		return string.format
	else
		return ''
	end
end

function TrackListing:renderTrackingCategories
	if not self.showCategories or mw.title.getCurrentTitle.namespace ~= 0 then
		return ''
	end

	local ret = ''

	local function addCategory(cat)
		ret = ret .. string.format
	end

	for i, category in ipairs(self:getCategories) do
		addCategory(category)
	end

	for i, track in ipairs(self.tracks) do
		for j, category in ipairs(track:getCategories) do
			addCategory(category)
		end
	end

	return ret
end

function TrackListing:renderWarnings
	if not SHOW_WARNINGS then
		return ''
	end

	local ret = {}

	local function addWarning(msg)
		table.insert(ret, string.format)
	end

	for i, warning in ipairs(self:getWarnings) do
		addWarning(warning)
	end

	for i, track in ipairs(self.tracks) do
		for j, warning in ipairs(track:getWarnings) do
			addWarning(warning)
		end
	end

	return table.concat
end

function TrackListing:__tostring
	-- Find columns to output
	local columns = {'number', 'title'}
	if self.optionalColumns.writer then
		columns[#columns + 1] = 'writer'
	else
		if self.optionalColumns.lyrics then
			columns[#columns + 1] = 'lyrics'
		end
		if self.optionalColumns.music then
			columns[#columns + 1] = 'music'
		end
	end
	if self.optionalColumns.arrangements then
		columns[#columns + 1] = 'arrangements'
	end
	if self.optionalColumns.extra then
		columns[#columns + 1] = 'extra'
	end
	columns[#columns + 1] = 'length'

	-- Find colspan and column width
	local nColumns = #columns
	local nOptionalColumns = nColumns - 3
	local titleColumnWidth
	if nColumns >= 6 then
		titleColumnWidth = 30
	elseif nColumns >= 5 then
		titleColumnWidth = 40
	elseif nColumns >= 4 then
		titleColumnWidth = 60
	else
		titleColumnWidth = 100
	end
	local optionalColumnWidth = (100 - titleColumnWidth) / nOptionalColumns
	titleColumnWidth = titleColumnWidth .. '%'
	optionalColumnWidth = optionalColumnWidth .. '%'

	-- Root of the output
	local root = mw.html.create

	-- Intro
	root:node(self:makeIntro)

	-- Start of track listing table
	local tableRoot = root:tag('table')
	tableRoot
		
	-- Header row
	if self.headline then
		tableRoot:tag('caption')
	end
	
	-- Deprecated collapsed parameter
	if self.collapsed or localArgs["숨김"] == '예' or localArgs["숨김"] == 'yes'
	or localArgs["collapsed"] == '예' or localArgs["collapsed"] == 'yes'
	then
		self:addWarning;
	end

	-- Headers
	local headerRow = tableRoot:tag('tr')

	headerRow

	headerRow:tag('th')

	local function addOptionalHeader
		if self.optionalColumns[field] then
			headerRow:tag('th')
		end
	end
	addOptionalHeader
	addOptionalHeader
	addOptionalHeader
	addOptionalHeader
	addOptionalHeader

	headerRow:tag('th')

	-- Tracks
	for i, track in ipairs(self.tracks) do
		tableRoot:node(track:exportRow({
			columns = columns,
			color = i % 2 == 0 and '#f7f7f7' or '#fff'
	end

	-- Total length
	if self.total_length then
		tableRoot
	end
	
	-- Warnings and tracking categories
	root:wikitext(self:renderWarnings)
	root:wikitext(self:renderTrackingCategories)

	return tostring(root)
end

-- Exports

local p = {}

function p._main(args)
	-- 로컬 변수 보관을 위해 사용
	localArgs = args

	-- Process numerical args so that we can iterate through them.
	local data, tracks = {}, {}
	for k, v in pairs(args) do
		if type(k) == 'string' then
			local prefix, num = k:match('^(%D.-)(%d+)$')
			prefix = translateFields(prefix)
			if prefix and Track.fields[prefix] and (num == '0' or num:sub ~= '0') then
				-- Allow numbers like 0, 1, 2 ..., but not 00, 01, 02...,
				-- 000, 001, 002... etc.
				num = tonumber(num)
				tracks[num] = tracks[num] or {}
				tracks[num][prefix] = v
			else
				data[translateFields(k)] = v
			end
		end
	end
	data.tracks = (function (t)
		-- Compress sparse array
		local ret = {}
		for num, trackData in pairs(t) do
			trackData.number = num
			table.insert 
		end
		table.sort(ret, function 
			return t1.number < t2.number
		end)
		return ret
	end)(tracks)

	return tostring(TrackListing.new(data))
end

function p.main(frame)
	local args = require('Module:Arguments').getArgs(frame, {
		wrappers = '틀:곡 목록'
	return p._main(args)
end