/obj/item/instrument/piano_synth
	name = "synthesizer"
	desc = "An advanced electronic synthesizer that can be used as various instruments."
	icon_state = "synth"
	inhand_icon_state = "synth"
	allowed_instrument_ids = "piano"
	var/circuit_type = /obj/item/circuit_component/synth
	var/shell_capacity = SHELL_CAPACITY_SMALL
	/// Can a mouse play this instrument?
	var/mouse_playable = TRUE

/obj/item/instrument/piano_synth/Initialize(mapload)
	. = ..()
	song.allowed_instrument_ids = SSinstruments.synthesizer_instrument_ids
	AddComponent(/datum/component/shell, list(new circuit_type), shell_capacity)

/obj/item/instrument/piano_synth/attack_animal(mob/living/simple_animal/user, list/modifiers)
	if (!mouse_playable || !ismouse(user))
		return ..()
	song.ui_interact(user)

/obj/item/instrument/piano_synth/headphones
	name = "headphones"
	desc = "Unce unce unce unce. Boop!"
	icon = 'icons/obj/clothing/accessories.dmi'
	worn_icon = 'icons/mob/clothing/head/costume.dmi'
	lefthand_file = 'icons/mob/inhands/clothing/ears_lefthand.dmi'
	righthand_file = 'icons/mob/inhands/clothing/ears_righthand.dmi'
	icon_state = "headphones"
	inhand_icon_state = "headphones"
	slot_flags = ITEM_SLOT_EARS | ITEM_SLOT_HEAD
	force = 0
	w_class = WEIGHT_CLASS_SMALL
	custom_price = PAYCHECK_CREW * 2.5
	equip_sound = SFX_HEADSET_EQUIP
	pickup_sound = SFX_HEADSET_PICKUP
	drop_sound = 'sound/items/handling/headset/headset_drop1.ogg'
	instrument_range = 1
	circuit_type = /obj/item/circuit_component/synth/headphones
	shell_capacity = SHELL_CAPACITY_TINY
	mouse_playable = FALSE

/obj/item/instrument/piano_synth/headphones/Initialize(mapload)
	. = ..()
	AddElement(/datum/element/update_icon_updates_onmob)
	RegisterSignal(src, COMSIG_INSTRUMENT_START, PROC_REF(update_icon_for_playing_music))
	RegisterSignal(src, COMSIG_INSTRUMENT_END, PROC_REF(update_icon_for_playing_music))

// Called by a component signal to update musical note VFX for songs playing while worn.
/obj/item/instrument/piano_synth/headphones/proc/update_icon_for_playing_music(datum/source, datum/starting_song, atom/player)
	SIGNAL_HANDLER
	update_appearance()

/obj/item/instrument/piano_synth/headphones/update_icon_state()
	. = ..()
	icon_state = "[initial(icon_state)][song?.playing ? "_on" : null]"

/obj/item/instrument/piano_synth/headphones/spacepods
	name = "\improper Nanotrasen space pods"
	desc = "Flex your money, AND ignore what everyone else says, all at once!"
	icon_state = "spacepods"
	worn_icon = 'icons/mob/clothing/ears.dmi'
	inhand_icon_state = null
	slot_flags = ITEM_SLOT_EARS
	strip_delay = 10 SECONDS //air pods don't fall out
	instrument_range = 0 //you're paying for quality here
	custom_premium_price = PAYCHECK_CREW * 36 //Save up 5 shifts worth of pay just to lose it down a drainpipe on the sidewalk

/obj/item/circuit_component/synth
	display_name = "Synthesizer"
	desc = "An advanced electronic synthesizer that can be used as various instruments."

	/// The song, represented in latin alphabet A to G, that'll be played when play is triggered.
	var/datum/port/input/song
	/// Starts playing the song.
	var/datum/port/input/play
	/// Stop playing the song.
	var/datum/port/input/stop
	/// How many times the song will be played.
	var/datum/port/input/repetitions
	/// The beats per minute of the song
	var/datum/port/input/beats_per_min
	/// The volume of the song
	var/datum/port/input/volume
	/// Notes with volume below this threshold will be dead
	var/datum/port/input/volume_dropoff
	/// Note shift
	var/datum/port/input/note_shift
	/// Sustain Mode
	var/datum/port/input/sustain_mode
	/// The value of the above
	var/datum/port/input/sustain_value
	/// If set the last held note will decay
	var/datum/port/input/note_decay
	/// The list of instruments which sound can be synthesized.
	var/datum/port/input/option/selected_instrument
	/// Whether a song is currently playing
	var/datum/port/output/is_playing
	/// Sent when a new song has started playing
	var/datum/port/output/started_playing
	/// Sent when a song has finished playing
	var/datum/port/output/stopped_playing

	/// The synthesizer this circut is attached to.
	var/obj/item/instrument/piano_synth/synth

/obj/item/circuit_component/synth/populate_ports()
	song = add_input_port("Song", PORT_TYPE_LIST(PORT_TYPE_STRING), trigger = PROC_REF(import_song))
	play = add_input_port("Play", PORT_TYPE_SIGNAL, trigger = PROC_REF(start_playing))
	stop = add_input_port("Stop", PORT_TYPE_SIGNAL, trigger = PROC_REF(stop_playing))
	repetitions = add_input_port("Repetitions", PORT_TYPE_NUMBER, trigger = PROC_REF(set_repetitions))
	beats_per_min = add_input_port("BPM", PORT_TYPE_NUMBER, trigger = PROC_REF(set_bpm))
	selected_instrument = add_option_port("Selected Instrument", SSinstruments.synthesizer_instrument_ids, trigger = PROC_REF(set_instrument))
	volume = add_input_port("Volume", PORT_TYPE_NUMBER, trigger = PROC_REF(set_volume))
	volume_dropoff = add_input_port("Volume Dropoff Threshold", PORT_TYPE_NUMBER, trigger = PROC_REF(set_dropoff))
	note_shift = add_input_port("Note Shift", PORT_TYPE_NUMBER, trigger = PROC_REF(set_note_shift))
	sustain_mode = add_option_port("Note Sustain Mode", SSinstruments.note_sustain_modes, trigger = PROC_REF(set_sustain_mode))
	sustain_value = add_input_port("Note Sustain Value", PORT_TYPE_NUMBER, trigger = PROC_REF(set_sustain_value))
	note_decay = add_input_port("Held Note Decay", PORT_TYPE_NUMBER, trigger = PROC_REF(set_sustain_decay))

	is_playing = add_output_port("Currently Playing", PORT_TYPE_NUMBER)
	started_playing = add_output_port("Started Playing", PORT_TYPE_SIGNAL)
	stopped_playing = add_output_port("Stopped Playing", PORT_TYPE_SIGNAL)

/obj/item/circuit_component/synth/register_shell(atom/movable/shell)
	. = ..()
	synth = shell
	RegisterSignal(synth, COMSIG_INSTRUMENT_START, PROC_REF(on_song_start))
	RegisterSignal(synth, COMSIG_INSTRUMENT_END, PROC_REF(on_song_end))
	RegisterSignal(synth, COMSIG_INSTRUMENT_SHOULD_STOP_PLAYING, PROC_REF(continue_if_autoplaying))

/obj/item/circuit_component/synth/unregister_shell(atom/movable/shell)
	if(synth.song.music_player == src)
		synth.song.stop_playing()
	UnregisterSignal(synth, list(COMSIG_INSTRUMENT_START, COMSIG_INSTRUMENT_END, COMSIG_INSTRUMENT_SHOULD_STOP_PLAYING))
	synth = null
	return ..()

/obj/item/circuit_component/synth/proc/start_playing(datum/port/input/port)
	synth.song.start_playing(src)

/obj/item/circuit_component/synth/proc/on_song_start(datum/source, datum/starting_song, atom/player)
	SIGNAL_HANDLER
	is_playing.set_output(TRUE)
	started_playing.set_output(COMPONENT_SIGNAL)
	if (beats_per_min.value)
		synth.song.set_bpm(beats_per_min.value)

/obj/item/circuit_component/synth/proc/continue_if_autoplaying(datum/source, atom/music_player)
	SIGNAL_HANDLER
	if(music_player == src)
		return IGNORE_INSTRUMENT_CHECKS

/obj/item/circuit_component/synth/proc/stop_playing(datum/port/input/port)
	synth.song.stop_playing()

/obj/item/circuit_component/synth/proc/on_song_end()
	SIGNAL_HANDLER
	is_playing.set_output(FALSE)
	stopped_playing.set_output(COMPONENT_SIGNAL)

/obj/item/circuit_component/synth/proc/import_song()
	synth.song.ParseSong(new_song = song.value)

/obj/item/circuit_component/synth/proc/set_repetitions()
	synth.song.set_repeats(repetitions.value)

/obj/item/circuit_component/synth/proc/set_bpm()
	if (beats_per_min.value)
		synth.song.set_bpm(beats_per_min.value)

/obj/item/circuit_component/synth/proc/set_instrument()
	synth.song.set_instrument(selected_instrument.value)

/obj/item/circuit_component/synth/proc/set_volume()
	synth.song.set_volume(volume.value)

/obj/item/circuit_component/synth/proc/set_dropoff()
	synth.song.set_dropoff_volume(volume_dropoff.value)

/obj/item/circuit_component/synth/proc/set_note_shift()
	synth.song.note_shift = clamp(note_shift.value, synth.song.note_shift_min, synth.song.note_shift_max)

/obj/item/circuit_component/synth/proc/set_sustain_mode()
	if(!(sustain_mode.value in SSinstruments.note_sustain_modes))
		return
	synth.song.sustain_mode = sustain_mode.value

/obj/item/circuit_component/synth/proc/set_sustain_value()
	switch(synth.song.sustain_mode)
		if(SUSTAIN_LINEAR)
			synth.song.set_linear_falloff_duration(sustain_value.value)
		if(SUSTAIN_EXPONENTIAL)
			synth.song.set_exponential_drop_rate(sustain_value.value)

/obj/item/circuit_component/synth/proc/set_sustain_decay()
	synth.song.full_sustain_held_note = !!synth.song.full_sustain_held_note

/obj/item/circuit_component/synth/headphones
	display_name = "Headphones"
	desc = "An advanced electronic device that plays music into your ears."