#!/usr/bin/env luajit

--[[
This is part of the JackOnAllDevices project, JOAD for short.

NOTE - Seems both ALSA and JACK are per user.

]]


-- CHANGE these to suit.
--local GUI = 'qjackctl'
local GUI = 'catia'
local alias = {
	{name='Screen', dev='HDMI9'},
    }


-- This APT stuff was copied from apt-panopticon.
local APT = {}

APT.readCmd = function(cmd)
    local result = {}
    local output = io.popen(cmd)
    if nil ~= output then
	for l in output:lines() do
	    table.insert(result, l)
	end
    end
    return result
end


APT.exe = function(c)
    local exe = {status = 0, result = '', lines = {}, log = true, cmd = c .. ' ', command = c}

    function exe:log()
	self.log = true
	return self
    end
    function exe:Nice(c)
	if nil == c then
	    self.cmd = 'ionice -c3 nice -n 19 ' .. self.cmd
	else
	    self.cmd = self.cmd .. 'ionice -c3 nice -n 19 ' .. c .. ' '
	end
	return self
    end
    function exe:timeout(c)
	-- timeout returns a status of - command status if --preserve-status; "128+9" (actually 137) if --kill-after ends up being done; 124 if it had to TERM; command status if all went well.
	-- --kill-after means "send KILL after TERM fails.
	if nil == c then
	    self.cmd = 'timeout --kill-after=10.0 --foreground 42.0s ' .. self.cmd
	else
	    self.cmd = 'timeout --kill-after=10.0 --foreground ' .. c .. ' ' .. self.cmd
	end
	return self
    end
    function exe:also(c)
	if nil == c then c = '' else c = ' ' .. c end
	self.cmd = self.cmd .. ';' .. c .. ' '
	return self
    end
    function exe:And(c)
	if nil == c then c = '' else c = ' ' .. c end
	self.cmd = self.cmd .. '&&' .. c .. ' '
	return self
    end
    function exe:Or(c)
	if nil == c then c = '' end
	self.cmd = self.cmd .. '|| ' .. c .. ' '
	return self
    end
    function exe:noErr()
	self.cmd = self.cmd .. '2>/dev/null '
	return self
    end
    function exe:wait(w)
	self.cmd = self.cmd .. '&& touch ' .. w .. ' '
	return self
    end
    function exe:Do()
    --[[    "The condition expression of a control structure can return any
	    value. Both false and nil are considered false. All values different
	    from nil and false are considered true (in particular, the number 0
	    and the empty string are also true)."
	says the docs, I beg to differ.]]
	if true == self.log then D("  executing - &nbsp; <code>" .. self.cmd .. "</code>") end
	--[[ Damn os.execute()
	    Lua 5.1 says it returns "a status code, which is system-dependent"
	    Lua 5.2 says it returns true/nil, "exit"/"signal", the status code.
	    I'm getting 7168 or 0.  No idea what the fuck that is.
	local ok, rslt, status = os.execute(s)
	]]
	local f = APT.readCmd(self.cmd, 'r')
	-- The last line will be the command's returned status, collect everything else in result.
	self.status = ''	-- Otherwise the result starts with 0.
	self.result = '\n'
	self.lines = f
	for i,l in ipairs(f) do
	    self.result = self.result .. l .. "\n"
	end
	f = APT.readCmd('echo "$?"', 'r')
	for i,l in ipairs(f) do
	    self.status = tonumber(l)
	    if (137 == self.status) or (124 == self.status) then
		print("timeout killed " .. self.status .. ' ' .. self.command)
		E("timeout killed " .. self.status .. ' ' .. self.command)
	    elseif (0 ~= self.status) then
		print("status |" .. self.status .. '| ' .. self.command)
		E("status |" .. self.status .. '| ' .. self.command)
	    end
	end
	return self
    end
    function exe:fork(host)
	if nil ~= host then self.cmd = self.cmd .. ';  r=$?; if [ $r -ge 124 ]; then echo "$r ' .. host .. ' failed forked command ' .. string.gsub(self.cmd, '"', "'") .. '"; fi' end
	self.cmd = '{ ' .. self.cmd .. '; } &'
	if true == self.log then D("  forking - &nbsp; <code>" .. self.cmd .. "</code>") end
	os.execute(self.cmd)
	return self
    end
    return exe
end



local Cards = {}

print('Scanning for audio devices.')
local cards = APT.exe('ls -d1 /proc/asound/card[0-9]*'):noErr():Do()
for  i,l in ipairs(cards.lines) do
    local f, e = io.open(l .. '/id', "r")
    if nil == f then print("Could not open " .. l .. '/id') else
	Cards[l] = {path = l, name = f:read("*a"):sub(1, -2), devs = {}, captureDevs = {}, playbackDevs = {}}
	if "Loopback" ~= Cards[l]['name'] then
	    Cards[l]['capture'] = APT.exe('ls -d1 ' .. l .. '/pcm[0-9]*c*'):noErr():Do()
	    for  j,c in ipairs(Cards[l]['capture'].lines) do
		local n = c:match(".*pcm(%d+).*")
		Cards[l]['captureDevs'][j] = n
		Cards[l]['devs'][n] = n
		print("\tFound capture device: " .. Cards[l]['name'] .. "\tDEVICE: " .. Cards[l]['captureDevs'][j] .. ' ' .. n)
	    end
	    Cards[l]['playback'] = APT.exe('ls -d1 ' .. l .. '/pcm[0-9]*p*'):noErr():Do()
	    for  j,p in ipairs(Cards[l]['playback'].lines) do
		local n = p:match(".*pcm(%d+).*")
		Cards[l]['playbackDevs'][j] = n
		Cards[l]['devs'][n] = n
		print("\tFound playback device: " .. Cards[l]['name'] .. "\tDEVICE: " .. Cards[l]['playbackDevs'][j] .. ' ' .. n)
	    end
	end
    end
end


print('')
print("Start up JACK and friends.")
print("jack_control")
APT.exe('jack_control start'):Do()
APT.exe('jack_control ds alsa'):Do()
--jack_control dps device hw:RIG,0
print("sleep 5")
APT.exe('sleep 5'):Do()
if nil ~= GUI then
    print(GUI)
    APT.exe(GUI):fork()
end
print("jack-plumbing")
APT.exe('jack-plumbing -q 2>/dev/null'):fork()
-- Bridge ALSA ports to JACK ports.  Only handles MIDI.
-- MIDI via a2jmidid.  The --ehw enables hardware ports as well, equal to using the seq MIDI drivare according to https://freeshell.de/~murks/posts/ALSA_and_JACK_MIDI_explained_(by_a_dummy_for_dummies)/
--a2j_control actually starts a2jmidid.
----a2jmidid -e -u &
-- I think the jack_control start and my current alsa config means a2jmidid gets started anyway.  But seem to need this bit to get the joystick covered.
print("a2j_control")
APT.exe('a2j_control --ehw && a2j_control --start'):Do()
print("sleep 2")
APT.exe('sleep 2'):Do()
print("")


--local AIN = "alsa_in"
local AIN = "zita-a2j"
--local AOUT = "alsa_out"
local AOUT = "zita-j2a"

print("Basic ALSA sound devices converted to JACK.")
for  i,C in pairs(alias) do
    print('HW playback: ' .. C['name'] .. '\tDEVICE: ' .. C['dev'])
    APT.exe('alsa_out -j ' .. C['name'] .. ' -d ' .. C['dev']):fork()
    APT.exe('sleep 1'):Do()
end
print("HW playback: cloop\tDEVICE: cloop")
-- No idea why, cloop wont work with zita-a2j.
APT.exe('alsa_in  -j cloop  -d cloop'):fork()
APT.exe('sleep 1'):Do()
APT.exe('jack_connect cloop:capture_1 system:playback_1'):Do()
APT.exe('jack_connect cloop:capture_2 system:playback_2'):Do()
print("HW playback: ploop\tDEVICE: ploop")
APT.exe('alsa_out -j ploop  -d ploop'):fork()
APT.exe('sleep 1'):Do()
APT.exe('jack_connect system:capture_1 ploop:playback_1'):Do()
APT.exe('jack_connect system:capture_2 ploop:playback_2'):Do()


print("")

print("Rest of ALSA sound devices converted to JACK.")
for  i,C in pairs(Cards) do
    for  j,c in ipairs(C['playbackDevs']) do
	print("HW playback: " .. C['name'] .. "\tDEVICE: " .. C['playbackDevs'][j])
	APT.exe(AOUT .. ' -j ' .. C['name'] .. "_" .. C['playbackDevs'][j] .. '-in -d ' .. C['name'] .. C['playbackDevs'][j]):fork()
--	APT.exe('sleep 1'):Do()
    end
    for  j,c in ipairs(C['captureDevs']) do
	print("HW capture: " .. C['name'] .. "\tDEVICE: " .. C['captureDevs'][j])
	APT.exe(AIN .. ' -j ' .. C['name'] .. "_" .. C['captureDevs'][j] .. '-out -d ' .. C['name'] .. C['captureDevs'][j]):fork()
--	APT.exe('sleep 1'):Do()
    end
end
print("")

print("Scanning for joysticks.")
local sticks = APT.exe('ls -1 /dev/input/js[0-9]*'):noErr():Do()
for  i,l in ipairs(sticks.lines) do
    print("aseqjoy " .. l)
    -- Buttons switch to that numbered MIDI channel, defaults to 1.
    -- Axis are mapped to MIDI controllers 10 - 15
    -- -r means to use high resolution MIDI values.
    APT.exe('aseqjoy -d ' .. l:sub(-1,-1) .. ' -r'):fork()
--    print("sleep 1")
--    APT.exe('sleep 1'):Do()
end
print("")