extends Control

const CLIENT_BUILD := "dev"
const PROTOCOL_VERSION := 1
const HEARTBEAT_SECONDS := 10.0
const RECOVERY_POLL_SECONDS := 2.0

@onready var playlist_dropdown: OptionButton = %PlaylistDropdown
@onready var status_label: Label = %StatusLabel
@onready var detail_label: Label = %DetailLabel
@onready var ranked_profile_label: Label = %RankedProfileLabel
@onready var queue_button: Button = %QueueButton
@onready var cancel_button: Button = %CancelButton
@onready var accept_button: Button = %AcceptButton
@onready var decline_button: Button = %DeclineButton
@onready var back_button: Button = %BackButton

var _elapsed_seconds := 0.0
var _heartbeat_seconds := 0.0
var _recovery_poll_seconds := 0.0


func _ready() -> void:
	playlist_dropdown.add_item("Casual")
	playlist_dropdown.set_item_metadata(0, "casual")
	playlist_dropdown.add_item("Ranked")
	playlist_dropdown.set_item_metadata(1, "ranked")
	playlist_dropdown.item_selected.connect(_on_playlist_selected)
	ControlPlaneClient.state.changed.connect(_on_state_changed)
	ControlPlaneClient.request_failed.connect(_on_request_failed)
	ControlPlaneClient.request_succeeded.connect(_on_request_succeeded)
	ControlPlaneClient.session_expired.connect(_on_session_expired)
	_refresh_ranked_profile()
	_render(ControlPlaneClient.state.snapshot())


func _process(delta: float) -> void:
	if ControlPlaneClient.state.phase in [MatchmakingState.QUEUED, MatchmakingState.PROPOSED, MatchmakingState.ALLOCATING]:
		_elapsed_seconds += delta
		_heartbeat_seconds += delta
		_recovery_poll_seconds += delta
		if _recovery_poll_seconds >= RECOVERY_POLL_SECONDS:
			_recovery_poll_seconds = 0.0
			var recovery_err := ControlPlaneClient.recover_proposal(ControlPlaneClient.state.proposal_id) if not ControlPlaneClient.state.proposal_id.is_empty() else ControlPlaneClient.recover_queue(ControlPlaneClient.state.ticket_id)
			if recovery_err != OK and recovery_err != ERR_BUSY:
				_on_local_error("State recovery unavailable: %s" % error_string(recovery_err))
		if ControlPlaneClient.state.phase == MatchmakingState.QUEUED and _heartbeat_seconds >= HEARTBEAT_SECONDS:
			_heartbeat_seconds = 0.0
			var err := ControlPlaneClient.heartbeat(ControlPlaneClient.state.ticket_id, ControlPlaneClient.state.revision)
			if err != OK:
				_on_local_error("Heartbeat unavailable: %s" % error_string(err))
	_render(ControlPlaneClient.state.snapshot())


func _on_queue_pressed() -> void:
	if ControlPlaneClient.can_retry_queue_create():
		var retry_err := ControlPlaneClient.retry_queue_create()
		if retry_err != OK:
			_on_local_error("Could not retry matchmaking: %s" % error_string(retry_err))
		return
	if ControlPlaneClient.can_retry_last_mutation():
		var mutation_err := ControlPlaneClient.retry_last_mutation()
		if mutation_err != OK:
			_on_local_error("Could not retry matchmaking action: %s" % error_string(mutation_err))
		return
	if not _can_start_new_search(ControlPlaneClient.state.phase):
		return
	_elapsed_seconds = 0.0
	_heartbeat_seconds = 0.0
	_recovery_poll_seconds = 0.0
	var playlist := String(playlist_dropdown.get_selected_metadata())
	var ticket_id := "ticket-%s-%s" % [str(Time.get_ticks_usec()), str(randi())]
	var err := ControlPlaneClient.queue_create(ticket_id, playlist, CLIENT_BUILD, PROTOCOL_VERSION)
	if err != OK:
		_on_local_error("Could not start matchmaking: %s" % error_string(err))


func _on_cancel_pressed() -> void:
	if not ControlPlaneClient.state.can_cancel():
		return
	var err := ControlPlaneClient.cancel_queue(ControlPlaneClient.state.ticket_id, ControlPlaneClient.state.revision)
	if err != OK:
		_on_local_error("Could not cancel matchmaking: %s" % error_string(err))


func _on_accept_pressed() -> void:
	var err := ControlPlaneClient.respond_to_proposal(ControlPlaneClient.state.proposal_id, true, ControlPlaneClient.state.proposal_revision)
	if err != OK:
		_on_local_error("Could not accept proposal: %s" % error_string(err))


func _on_decline_pressed() -> void:
	var err := ControlPlaneClient.respond_to_proposal(ControlPlaneClient.state.proposal_id, false, ControlPlaneClient.state.proposal_revision)
	if err != OK:
		_on_local_error("Could not decline proposal: %s" % error_string(err))


func _on_playlist_selected(_index: int) -> void:
	_refresh_ranked_profile()


func _refresh_ranked_profile() -> void:
	var ranked := String(playlist_dropdown.get_selected_metadata()) == "ranked"
	ranked_profile_label.visible = ranked
	if not ranked:
		return
	var err := ControlPlaneClient.fetch_ranked_profile()
	if err != OK and err != ERR_BUSY:
		ranked_profile_label.text = "Ranked profile unavailable: %s" % error_string(err)


func _on_back_pressed() -> void:
	if ControlPlaneClient.state.can_cancel():
		status_label.text = "Cancel the active search before leaving"
		return
	get_tree().change_scene_to_file(ScenePaths.MAIN_MENU)


func _on_state_changed(snapshot: Dictionary) -> void:
	_render(snapshot)


func _on_request_succeeded(_operation: String, _payload: Dictionary) -> void:
	ranked_profile_label.text = ControlPlaneClient.ranked_profile.display_text()
	_render(ControlPlaneClient.state.snapshot())


func _on_request_failed(_operation: String, _http_code: int, detail: String) -> void:
	detail_label.text = detail
	ranked_profile_label.text = ControlPlaneClient.ranked_profile.display_text()
	_render(ControlPlaneClient.state.snapshot())


func _on_session_expired() -> void:
	status_label.text = "Session expired"
	detail_label.text = "Sign in again before searching for a match"
	queue_button.disabled = true


func _on_local_error(detail: String) -> void:
	detail_label.text = detail


static func phase_label(phase: String) -> String:
	match phase:
		MatchmakingState.IDLE:
			return "Ready to search"
		MatchmakingState.QUEUED:
			return "Searching for players"
		MatchmakingState.PROPOSED:
			return "Match found — confirm"
		MatchmakingState.ALLOCATING:
			return "Preparing match server"
		MatchmakingState.PROCESS_READY:
			return "Match server started"
		MatchmakingState.ASSIGNMENT_READY:
			return "Match assigned"
		MatchmakingState.CONNECTING:
			return "Connecting to match"
		MatchmakingState.LIVE:
			return "Match in progress"
		MatchmakingState.CANCELLED:
			return "Search cancelled"
		MatchmakingState.EXPIRED:
			return "Search expired"
		MatchmakingState.FAILED:
			return "Matchmaking unavailable"
		_:
			return "Recovering matchmaking state"


func _render(snapshot: Dictionary) -> void:
	var phase := String(snapshot.get("phase", MatchmakingState.IDLE))
	status_label.text = phase_label(phase)
	if String(snapshot.get("message", "")) != "":
		detail_label.text = String(snapshot["message"])
	elif phase == MatchmakingState.QUEUED:
		detail_label.text = "Elapsed %.0fs · revision %d" % [_elapsed_seconds, int(snapshot.get("revision", 0))]
	elif phase == MatchmakingState.PROPOSED:
		detail_label.text = "Review the proposal before the countdown expires"
	elif phase == MatchmakingState.IDLE:
		detail_label.text = "Choose a playlist to begin"
	cancel_button.visible = ControlPlaneClient.state.can_cancel()
	accept_button.visible = phase == MatchmakingState.PROPOSED
	decline_button.visible = phase == MatchmakingState.PROPOSED
	var retry_search := ControlPlaneClient.can_retry_queue_create()
	var retry_mutation := ControlPlaneClient.can_retry_last_mutation()
	queue_button.disabled = ControlPlaneClient.auth_expired or not (_can_start_new_search(phase) or retry_search or retry_mutation)
	queue_button.text = "Retry Search" if retry_search else ("Retry Request" if retry_mutation else "Search")


static func _is_terminal(phase: String) -> bool:
	return phase in [MatchmakingState.CANCELLED, MatchmakingState.EXPIRED, MatchmakingState.FAILED, MatchmakingState.LIVE]


static func _can_start_new_search(phase: String) -> bool:
	return phase == MatchmakingState.IDLE or phase in [MatchmakingState.CANCELLED, MatchmakingState.EXPIRED, MatchmakingState.FAILED]