local p = {}

local key_labels = {
	-- Control keys
	['backspace'] = '← Backspace',
	['caps lock'] = '⇪ Caps Lock',
	['cmd'] = '⌘ Cmd',
	['command'] = '⌘ Command',
	['enter'] = '↵ Enter',
	['hyper'] = '✦ Hyper',
	['menu'] = '≣ Menu',
	['meta'] = '◆ Meta',
	['opt'] = '⌥ Opt',
	['option'] = '⌥ Option',
	['shift'] = '⇧ Shift',
	['tab'] = 'Tab ↹',
	['super'] = '❖ Super',
	['win'] = '⊞ Win',

	['[[alt]]'] = '[[Alt key|Alt]]',
	['[[altgr]]'] = '[[AltGr key|AltGr]]',
	['[[backspace]]'] = '← [[Backspace]]',
	['[[caps lock]]'] = '⇪ [[Caps Lock]]',
	['[[cmd]]'] = '⌘ [[Command key|Cmd]]',
	['[[command]]'] = '⌘ [[Command key|Command]]',
	['[[delete]]'] = '[[Delete key|Delete]]',
	['[[end]]'] = '[[End key|End]]',
	['[[enter]]'] = '↵ [[Enter key|Enter]]',
	['[[esc]]'] = '[[Esc key|Escape]]',
	['[[escape]]'] = '[[Esc key|Esc]]',
	['[[fn]]'] = '[[Fn key|Fn]]',
	['[[home]]'] = '[[Home key|Home]]',
	['[[hyper]]'] = '✦ [[Hyper key|Hyper]]',
	['[[insert]]'] = '[[Insert key|Insert]]',
	['[[menu]]'] = '≣ [[Menu key|Menu]]',
	['[[meta]]'] = '◆ [[Meta key|Meta]]',
	['[[opt]]'] = '⌥ [[Option key|Opt]]',
	['[[option]]'] = '⌥ [[Option key|Option]]',
	['[[page down]]'] = '[[Page Up and Page Down keys|Page Down]]',
	['[[page up]]'] = '[[Page Up and Page Down keys|Page Up]]',
	['[[pgdn]]'] = '[[Page Up and Page Down keys|PgDn]]',
	['[[pgup]]'] = '[[Page Up and Page Down keys|PgUp]]',
	['[[print screen]]'] = '[[Print Screen]]',
	['[[prt sc]]'] = '[[Print Screen|Prt Sc]]',
	['[[return]]'] = '↵ [[Enter key|Return]]',
	['[[scrlk]]'] = '[[Scroll Lock|ScrLk]]',
	['[[scroll lock]]'] = '[[Scroll Lock]]',
	['[[shift]]'] = '⇧ [[Shift key|Shift]]',
	['[[super]]'] = '❖ [[Super key (keyboard button)|Super]]',
	['[[tab]]'] = '[[Tab key|Tab]] ↹',
	['[[win]]'] = '⊞ [[Windows key|Win]]',
	['[[windows]]'] = '⊞ [[Windows key|Windows]]',
	
	-- Arrow keys
	['up'] = '↑',
	['down'] = '↓',
	['left'] = '←',
	['right'] = '→',

	['[[up]]'] = '[[Arrow key|↑]]',
	['[[down]]'] = '[[Arrow key|↓]]',
	['[[left]]'] = '[[Arrow key|←]]',
	['[[right]]'] = '[[Arrow key|→]]',

	-- Characters
	['asterisk'] = '*',
	['hash'] = '#',
	['colon'] = ':',
	['pipe'] = '|',
	['semicolon'] = '&#59;',
	['equals'] = '=',

	-- Left & right analog sticks.
	['l up'] = 'L↑',
	['l down'] = 'L↓',
	['l left'] = 'L←',
	['l right'] = 'L→',
	['l ne'] = 'L↗',
	['l se'] = 'L↘',
	['l nw'] = 'L↖',
	['l sw'] = 'L↙',

	['r up'] = 'R↑',
	['r down'] = 'R↓',
	['r left'] = 'R←',
	['r right'] = 'R→',
	['r ne'] = 'R↗',
	['r se'] = 'R↘',
	['r nw'] = 'R↖',
	['r sw'] = 'R↙',

	-- PlayStation keys
	['ex'] = '×',
	['circle'] = '○',
	['square'] = '□',
	['triangle'] = '△',

	-- Nintendo 64 and GameCube keys
	['c up'] = 'C↑',
	['c down'] = 'C↓',
	['c left'] = 'C←',
	['c right'] = 'C→',
	['c ne'] = 'C↗',
	['c se'] = 'C↘',
	['c nw'] = 'C↖',
	['c sw'] = 'C↙',
}

local label_aliases = {
	['*'] = 'asterisk',
	['#'] = 'hash',
	[':'] = 'colon',
	[';'] = 'semicolon',
	
	['l-up'] = 'l up',
	['l-down'] = 'l down',
	['l-left'] = 'l left',
	['l-right'] = 'l right',
	['l-ne'] = 'l ne',
	['l-se'] = 'l se',
	['l-nw'] = 'l nw',
	['l-sw'] = 'l sw',
	['r-up'] = 'r up',
	['r-down'] = 'r down',
	['r-left'] = 'r left',
	['r-right'] = 'r right',
	['r-ne'] = 'r ne',
	['r-se'] = 'r se',
	['r-nw'] = 'r nw',
	['r-sw'] = 'r sw',
	
	['ps x'] = 'ex',
	['ps c'] = 'circle',
	['ps s'] = 'square',
	['ps t'] = 'triangle',
	
	['c-up'] = 'c up',
	['c-down'] = 'c down',
	['c-left'] = 'c left',
	['c-right'] = 'c right',
	['c-ne'] = 'c ne',
	['c-se'] = 'c se',
	['c-nw'] = 'c nw',
	['c-sw'] = 'c sw',
}

local function format_key_press(args)
	local result = {}
	local chain = args.chain or ' + '

	for i, id in ipairs(args) do
		local lc = id:lower()
		local text = key_labels[lc] or key_labels[label_aliases[lc]] or id

		local label = mw.html.create("kbd")
			:addClass("keyboard-key nowrap")
			:wikitext(text)
		
		table.insert(result, tostring(label))
	end
	
	return mw.getCurrentFrame():extensionTag{
		name = 'templatestyles',
		args = { src = 'Template:Key press/styles.css'} 
	} .. table.concat(result, chain)
end

function p.key_press(frame)
	return format_key_press(frame:getParent().args)
end

return p