extends GameMode

# Timed match: two teams, score tracking, kickoff resets after each goal.
# The opponent is a trained AI bot when a policy model is configured
# (see TRAINING.md for training and promoting models into res://bots/),
# otherwise an inert placeholder ship.

signal timer_updated(minutes: int, seconds: int)
signal score_changed(score: Dictionary)
# winning_team is -1 for a draw. Never -1 when reached via overtime.
signal match_ended(winning_team: int, score: Dictionary)
# Counts 3, 2, 1, then 0 ("go", hide the label).
signal kickoff_countdown(count: int)
# Full time ended level: sudden-death golden goal, no clock.
signal overtime_started

# How long the result overlay stays up before returning to the menu.
const RESULT_SCREEN_SECONDS := 5.0
const KICKOFF_COUNTDOWN_SECONDS := 3

@export var match_length_seconds := 150.0

@export_group("AI opponent")
# Trained policy for the opponent; empty = inert placeholder ship.
@export_file("*.json") var bot_model_path: String = ""
# Difficulty handicaps, applied on top of the model (see AIShipController).
@export_range(1, 60) var bot_reaction_ticks: int = 8
@export_range(0.0, 1.0) var bot_action_noise: float = 0.0

var score := {0: 0, 1: 0}
var match_timer: Timer
var _in_overtime := false


func _start() -> void:
	spawn_ball()
	var player_ship := spawn_ship(0, 0, PlayerShipController.new())
	spawn_camera_rig(player_ship)
	spawn_ship(1, 0, _make_opponent_controller())

	await _run_kickoff_countdown()

	match_timer = Timer.new()
	match_timer.one_shot = true
	match_timer.wait_time = match_length_seconds
	match_timer.timeout.connect(_on_match_timer_timeout)
	add_child(match_timer)
	match_timer.start()


func _make_opponent_controller() -> ShipController:
	# The main menu's dropdown selection (GameSettings autoload) wins over the
	# scene's export, which stays as the fallback for direct-scene runs.
	var path := bot_model_path if GameSettings.selected_bot_path.is_empty() else GameSettings.selected_bot_path
	if not path.is_empty() and FileAccess.file_exists(path):
		var bot := AIShipController.new()
		bot.model_path = path
		bot.reaction_ticks = bot_reaction_ticks
		bot.action_noise = bot_action_noise
		return bot
	if not path.is_empty():
		push_warning("MatchMode: bot model not found at %s, spawning inert opponent" % path)
	return ShipController.new()  # inert placeholder


func _process(_delta):
	if match_timer and match_timer.time_left > 0:
		var remaining := ceili(match_timer.time_left)
		timer_updated.emit(floori(remaining / 60.0), remaining % 60)


func _on_goal_scored(conceding_team: int) -> void:
	var scoring_team := 1 - conceding_team
	score[scoring_team] += 1
	score_changed.emit(score.duplicate())
	print("Goal for team %d! Score: %d - %d" % [scoring_team, score[0], score[1]])
	if _in_overtime:
		# Golden goal: the first score after a draw ends the match outright.
		_end_match(scoring_team)
		return
	await _run_kickoff_countdown()


# Used both for the initial kickoff and after every goal. Freezes ball/ships
# via RigidBody3D.freeze — a built-in engine property — so this needs zero
# changes to ship.gd/ball.gd/ship_controller.gd, keeping training_mode.gd
# (which never calls into this file) completely untouched.
func _run_kickoff_countdown() -> void:
	reset_ball()
	reset_ships()
	_set_frozen(true)
	for count in range(KICKOFF_COUNTDOWN_SECONDS, 0, -1):
		kickoff_countdown.emit(count)
		# process_always=false: if full-time fires mid-countdown (see
		# _on_match_timer_timeout's get_tree().paused = true), this stalls
		# harmlessly in lockstep with the pause instead of ticking a
		# countdown label over the results screen.
		await get_tree().create_timer(1.0, false).timeout
	kickoff_countdown.emit(0)
	_set_frozen(false)


func _set_frozen(frozen: bool) -> void:
	if is_instance_valid(ball):
		ball.set_deferred("freeze", frozen)
	for ship in ships:
		if is_instance_valid(ship):
			ship.set_deferred("freeze", frozen)


func _on_match_timer_timeout() -> void:
	print("Full time! Score: %d - %d" % [score[0], score[1]])
	if score[0] == score[1]:
		await _start_overtime()
		return
	_end_match(0 if score[0] > score[1] else 1)


# Full time ended level: sudden-death golden goal, no clock running.
# _on_goal_scored checks _in_overtime and ends the match on the next goal.
func _start_overtime() -> void:
	_in_overtime = true
	overtime_started.emit()
	await _run_kickoff_countdown()


func _end_match(winning_team: int) -> void:
	print("Match over! Final score: %d - %d" % [score[0], score[1]])
	match_ended.emit(winning_team, score.duplicate())
	# Freeze gameplay while the HUD (process_mode ALWAYS) shows the result.
	get_tree().paused = true
	await get_tree().create_timer(RESULT_SCREEN_SECONDS).timeout
	# Unpause before leaving, or the menu arrives paused and unresponsive.
	get_tree().paused = false
	get_tree().change_scene_to_file(MAIN_MENU_SCENE_PATH)