local p = {}
local getArgs = require('Module:Arguments').getArgs
local gsub = mw.ustring.gsub

local function isCons(s)
	if s == 'b'
	or s == 'd'
	or s == 'dj'
	or s == 'dʒ'
	or s == 'ð'
	or s == 'f'
	or s == 'ɡ'
	or s == 'h'
	or s == 'hw'
	or s == 'j'
	or s == 'k'
	or s == 'l'
	or s == 'lj'
	or s == 'm'
	or s == 'n'
	or s == 'nj'
	or s == 'ŋ'
	or s == 'p'
	or s == 'r'
	or s == 's'
	or s == 'sj'
	or s == 'ʃ'
	or s == 't'
	or s == 'tj'
	or s == 'tʃ'
	or s == 'θ'
	or s == 'θj'
	or s == 'v'
	or s == 'w'
	or s == 'z'
	or s == 'zj'
	or s == 'ʒ'
	or s == 'x'
	or s == 'ʔ'
	then
		return true
	end
end

local function isVowel(s)
	if s == 'ɑː'
	or s == 'ɑːr'
	or s == 'ɒ'
	or s == 'ɒr'
	or s == 'æ'
	or s == 'ær'
	or s == 'aɪ'
	or s == 'aɪər'
	or s == 'aʊ'
	or s == 'aʊər'
	or s == 'ɛ'
	or s == 'ɛr'
	or s == 'eɪ'
	or s == 'ɛər'
	or s == 'ɪ'
	or s == 'ɪr'
	or s == 'iː'
	or s == 'ɪər'
	or s == 'ɔː'
	or s == 'ɔːr'
	or s == 'ɔɪ'
	or s == 'ɔɪər'
	or s == 'oʊ'
	or s == 'ɔər'
	or s == 'ʊ'
	or s == 'ʊr'
	or s == 'uː'
	or s == 'ʊər'
	or s == 'juː'
	or s == 'jʊər'
	or s == 'ʌ'
	or s == 'ʌr'
	or s == 'ɜːr'
	or s == 'ə'
	or s == 'ər'
	or s == 'əl'
	or s == 'ən'
	or s == 'əm'
	or s == 'i'
	or s == 'u'
	or s == 'ᵻ'
	or s == 'ᵿ'
	or s == 'jᵿ'
	then
		return true
	end
end

local function isChecked(s)
	if s == 'ɒ'
	or s == 'æ'
	or s == 'ɛ'
	or s == 'ɪ'
	or s == 'ʊ'
	or s == 'ʌ'
	then
		return true
	end
end

local function isSeg(s)
	if isCons(s) or isVowel(s) then
		return true
	end
end

local function isStr(s)
	if s == 'ˈ' or s == 'ˌ' then
		return true
	end
end

local function toResp(s)
	if s == 'dj' then
		return 'dy'
	elseif s == 'dʒ' then
		return 'j'
	elseif s == 'ð' then
		return 'dh'
	elseif s == 'ɡ' then
		return 'g'
	elseif s == 'hw' then
		return 'wh'
	elseif s == 'j' then
		return 'y'
	elseif s == 'lj' then
		return 'ly'
	elseif s == 'nj' then
		return 'ny'
	elseif s == 'ŋ' then
		return 'ng'
	elseif s == 'sj' then
		return 'sy'
	elseif s == 'ʃ' then
		return 'sh'
	elseif s == 'tj' then
		return 'ty'
	elseif s == 'tʃ' then
		return 'ch'
	elseif s == 'θ' then
		return 'th'
	elseif s == 'θj' then
		return 'thy'
	elseif s == 'zj' then
		return 'zy'
	elseif s == 'ʒ' then
		return 'zh'
	elseif s == 'ɑː' then
		return 'ah'
	elseif s == 'ɑːr' then
		return 'ar'
	elseif s == 'ɒ' then
		return 'o'
	elseif s == 'ɒr' then
		return 'orr'
	elseif s == 'æ' then
		return 'a'
	elseif s == 'ær' then
		return 'arr'
	elseif s == 'aɪ' then
		return 'eye'
	elseif s == 'aɪər' then
		return 'ire'
	elseif s == 'aʊ' then
		return 'ow'
	elseif s == 'aʊər' then
		return 'owr'
	elseif s == 'ɛ' then
		return 'e'
	elseif s == 'ɛr' then
		return 'err'
	elseif s == 'eɪ' then
		return 'ay'
	elseif s == 'ɛər' then
		return 'air'
	elseif s == 'ɪ' then
		return 'i'
	elseif s == 'ɪr' then
		return 'irr'
	elseif s == 'iː' then
		return 'ee'
	elseif s == 'ɪər' then
		return 'eer'
	elseif s == 'ɔː' then
		return 'aw'
	elseif s == 'ɔːr' then
		return 'or'
	elseif s == 'ɔɪ' then
		return 'oy'
	elseif s == 'ɔɪər' then
		return 'oir'
	elseif s == 'oʊ' then
		return 'oh'
	elseif s == 'ɔər' then
		return 'ohr'
	elseif s == 'ʊ' then
		return 'uu'
	elseif s == 'ʊr' then
		return 'uurr'
	elseif s == 'uː' then
		return 'oo'
	elseif s == 'ʊər' then
		return 'oor'
	elseif s == 'juː' then
		return 'ew'
	elseif s == 'jʊər' then
		return 'ewr'
	elseif s == 'ʌ' then
		return 'u'
	elseif s == 'ʌr' then
		return 'urr'
	elseif s == 'ɜːr' then
		return 'ur'
	elseif s == 'i' then
		return 'ee'
	elseif s == 'u' then
		return 'oo'
	elseif s == 'ᵻ' then
		return 'i'
	elseif s == 'ᵿ' then
		return 'uu'
	elseif s == 'jᵿ' then
		return 'yuu'
	elseif s == 'x' then
		return 'kh'
	else
		return s
	end
end

function p._main(args)
	local ret = { '' }
	local strNum = {}
	
	local hasPrimStress = false
	for i, v in ipairs(args) do
		-- Swap stress and consonant after checked vowel
		if isChecked(args[i - 2]) and isStr(args[i - 1]) and isCons(v) then
			args[i] = args[i - 1]
			args[i - 1] = v
		end
		
		-- Disable secondary stress following primary stress
		if v == 'ˈ' then
			hasPrimStress = true
		elseif v == '_' or v == ',_' then -- But not in case of a word break
			hasPrimStress = false
		end
		if hasPrimStress and v == 'ˌ' then
			args[i] = '.'
		end
	end
	
	for i, v in ipairs(args) do
		if v == '.' then
			table.insert(ret, '')
		elseif isStr(v) then
			if isSeg(args[i - 1]) then
				table.insert(ret, '')
			end
			table.insert(strNum, #ret)
		elseif isSeg(v) then
			ret[#ret] = ret[#ret] .. toResp(v)

			-- Break after checked vowel + segment
			if isChecked(args[i - 1]) and isSeg(v) and isSeg(args[i + 1]) then
				-- See if there's a vowel down the line
				local j = i + 1
				while args[j] do
					if isVowel(args[j]) then
						j = isVowel(args[j])
						break
					end
					j = j + 1
				end
				if j == true then -- There IS a vowel down the line
					table.insert(ret, '')
				end
			end
			
			-- Break after free vowel
			if isVowel(v) and not isChecked(v) and isCons(args[i + 1]) and isSeg(args[i + 2]) then
				table.insert(ret, '')
			end
			
			-- Break between vowels
			if isVowel(v) and not isChecked(v) and isVowel(args[i + 1]) then
				table.insert(ret, '')
			end
		else
			-- Process separators
			table.insert(ret, v)
			table.insert(ret, '')
		end
	end
	
	for i, v in ipairs(ret) do
		v = gsub(v, '([dlnstz]h?)yoo', '%1ew')
		v = gsub(v, 'g([ei])', 'gh%1')
		v = gsub(v, 'ch$', 'tch')
		v = gsub(v, '([eio])s$', '%1ss')
		v = gsub(v, '(.)eye(.+)', '%1y%2e')
		v = gsub(v, '(.)eye', '%1y')
		ret[i] = v
	end
	
	-- Capitalize stressed syllables
	for i, v in ipairs(strNum) do
		ret[v] = mw.ustring.upper(ret[v])
	end
	
	return table.concat(ret, '-')
end

function p.main(frame)
	local args = getArgs(frame)
	return frame:expandTemplate{
		title = 'Template:IPAc-en',
		args = args
	} .. ' ' ..
--[[	frame:expandTemplate{
		title = 'Template:Respell',
		args = p._main(args)
	}
	table.concat(p._main(args), '-')]]
	p._main(args)
end

return p