extends CharacterBody3D
var camera: Camera3D
var damage_pivot: Node3D
var damage_feedback: CanvasLayer
const DamageFeedback = preload("res://scripts/damage_feedback.gd")
const MAX_HP := 100.0
var hp := MAX_HP
var _regen_elapsed := 0.0

## Discreto: +1 HP per secondo di gioco, mai oltre il massimo o dopo morte.
func _regenerate_health(dt: float) -> void:
	if hp <= 0 or death_started or hp >= MAX_HP:
		_regen_elapsed = 0.0
		return
	_regen_elapsed += dt
	while _regen_elapsed >= 1.0:
		_regen_elapsed -= 1.0
		hp = minf(MAX_HP, hp + 1.0)
var ammo := 30
var cooldown := 0.0
var grenade_cooldown := 0.0
const GRENADE_COOLDOWN := 15.0
const Grenade = preload("res://scripts/grenade.gd")
var reloading := false
var gun: Node3D
var flash: OmniLight3D
var weapon_anim: AnimationPlayer
var step_timer := 0.0
var death_started := false
var death_overlay: ColorRect
## True quando la partita e' guidata dai controlli on-screen (touch): il mouse
## emulato dai tocchi non deve muovere la visuale ne' sparare al posto del dito.
var touch_mode := false
const Blood = preload("res://scripts/blood_effects.gd")
const Audio = preload("res://scripts/hl_audio.gd")

func _ready() -> void:
	collision_layer = 2
	collision_mask = 1 | 4
	var cs := CollisionShape3D.new()
	var cap := CapsuleShape3D.new()
	cap.height = 1.8
	cap.radius = 0.35
	cs.shape = cap
	cs.position.y = 0.9
	add_child(cs)
	camera = Camera3D.new()
	camera.position.y = 1.65
	camera.current = true
	camera.fov = 80
	damage_pivot = Node3D.new()
	damage_pivot.name = "DamagePivot"
	add_child(damage_pivot)
	damage_pivot.add_child(camera)
	damage_feedback = CanvasLayer.new()
	damage_feedback.set_script(DamageFeedback)
	damage_feedback.pivot = damage_pivot
	add_child(damage_feedback)
	gun = Node3D.new()
	camera.add_child(gun)
	var viewmodel: Node3D = load("res://assets/weapons/v_9mmar.scn").instantiate()
	gun.add_child(viewmodel)
	for area in viewmodel.find_children("*", "Area3D", true, false):
		area.collision_layer = 0
		area.collision_mask = 0
	for mesh in viewmodel.find_children("*", "MeshInstance3D", true, false):
		mesh.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
		mesh.layers = 2
	weapon_anim = viewmodel.get_node("AnimationPlayer")
	weapon_anim.animation_finished.connect(func(_name: StringName):
		if not reloading and not death_started:
			weapon_anim.play("idle1"))
	weapon_anim.play("deploy")
	flash = OmniLight3D.new()
	flash.position = Vector3(0.28, -0.2, -1.1)
	flash.light_color = Color(1, 0.7, 0.25)
	flash.omni_range = 7
	flash.light_energy = 0
	camera.add_child(flash)
	if DisplayServer.get_name() != "headless" and not OS.has_feature("web"):
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED

var restart_button: Button

func _input(event: InputEvent) -> void:
	# Touch nativo: funziona anche con emulate_mouse_from_touch disattivato.
	if event is InputEventScreenTouch and event.pressed and is_instance_valid(restart_button):
		if not restart_button.disabled and restart_button.get_global_rect().has_point(event.position):
			restart_button.disabled = true
			get_viewport().set_input_as_handled()
			get_tree().call_deferred("reload_current_scene")

func _unhandled_input(event: InputEvent) -> void:
	if OS.has_feature("web") and not touch_mode and event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_LEFT and not death_started:
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	if event is InputEventMouseMotion and not touch_mode and Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
		apply_look(event.relative)
	if event.is_action_pressed("pause") and not death_started:
		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE if Input.mouse_mode == Input.MOUSE_MODE_CAPTURED else Input.MOUSE_MODE_CAPTURED

## Ricarica: tempi invariati, riusata da tastiera (R) e dal pulsante on-screen.
func start_reload() -> void:
	if reloading or death_started or hp <= 0 or ammo >= 30:
		return
	reloading = true
	weapon_anim.play("reload")
	Audio.play(self, "items/cliprelease1.wav")
	get_tree().create_timer(0.8).timeout.connect(func():
		if not death_started:
			Audio.play(self, "items/clipinsert1.wav"))
	get_tree().create_timer(1.57).timeout.connect(func():
		if not death_started:
			ammo = 30
			reloading = false
			weapon_anim.play("idle1"))

## Azioni a pressione singola lette a polling: stesso percorso per tastiera,
## joypad e pulsanti on-screen. Gli InputEventAction sintetici, generati dentro
## il dispatch di un altro evento (come fa un tocco), non arrivano affidabilmente
## a _unhandled_input; lo stato delle azioni invece si'.
func _handle_actions() -> void:
	if Input.is_action_just_pressed("reload") and not reloading and ammo < 30:
		start_reload()
	if Input.is_action_just_pressed("grenade") and not death_started and (touch_mode or Input.mouse_mode == Input.MOUSE_MODE_CAPTURED):
		throw_grenade()

## Rotazione della visuale. Unico punto in cui vivono sensibilita' e limiti di
## inclinazione, condiviso da mouse e controlli touch.
func apply_look(relative: Vector2) -> void:
	if hp <= 0 or death_started:
		return
	rotate_y(-relative.x * 0.0025)
	camera.rotation.x = clampf(camera.rotation.x - relative.y * 0.0025, -1.4, 1.4)

func _physics_process(dt: float) -> void:
	cooldown -= dt
	grenade_cooldown = maxf(0, grenade_cooldown - dt)
	flash.light_energy = maxf(0, flash.light_energy - dt * 60)
	gun.position.z = lerpf(gun.position.z, 0, dt * 15)
	if hp <= 0:
		if Input.is_action_just_pressed("reload"):
			get_tree().reload_current_scene()     # R o pulsante Ricarica a partita finita
		return
	_regenerate_health(dt)
	if ammo <= 0 and not reloading:
		start_reload()
	_handle_actions()
	# Deadzone esplicita piccola (0.2): con la 0.5 delle azioni la corsa utile del
	# joystick touch si dimezzerebbe, mentre per tastiera/joypad nulla cambia.
	var input := Input.get_vector("move_left", "move_right", "move_forward", "move_back", 0.2)
	var direction := transform.basis * Vector3(input.x, 0, input.y)
	velocity.x = direction.x * 5
	velocity.z = direction.z * 5
	velocity.y -= 20 * dt
	if is_on_floor() and Input.is_action_just_pressed("jump"):
		velocity.y = 7
	move_and_slide()
	step_timer -= dt
	if is_on_floor() and direction.length() > 0.1 and step_timer <= 0:
		step_timer = 0.42
		Audio.play(self, "player/pl_metal%d.wav" % randi_range(1, 4), false, -18)
	if Input.is_action_just_pressed("shoot") and ammo <= 0 and not reloading:
		Audio.play(self, "weapons/dryfire1.wav")
	if Input.is_action_pressed("shoot") and cooldown <= 0 and ammo > 0 and not reloading and (touch_mode or Input.mouse_mode == Input.MOUSE_MODE_CAPTURED):
		shoot()

func shoot() -> void:
	if ammo <= 0 or reloading or hp <= 0:
		return
	weapon_anim.stop()
	weapon_anim.play("shoot")
	Audio.play(self, "weapons/hks%d.wav" % randi_range(1, 3), false, -13)
	ammo -= 1
	cooldown = 0.13
	flash.light_energy = 3
	gun.position.z = 0.06
	var start := camera.global_position
	var query := PhysicsRayQueryParameters3D.create(start, start - camera.global_basis.z * 80, 1 | 4)
	var hit := get_world_3d().direct_space_state.intersect_ray(query)
	if hit and hit.collider.has_method("take_damage"):
		Blood.impact(get_parent(), hit.position, -camera.global_basis.z)
		hit.collider.take_damage(35, hit.position.y)
	if ammo <= 0:
		start_reload()

func throw_grenade() -> RigidBody3D:
	if death_started or hp <= 0 or grenade_cooldown > 0:
		return null
	var world := get_parent() as Node3D
	var forward := -camera.global_basis.z
	var start := camera.global_position
	var destination := start + forward * 0.55
	# Do not spawn through the wall when the camera is close to it.
	var query := PhysicsRayQueryParameters3D.create(start, destination, 1)
	var hit := get_world_3d().direct_space_state.intersect_ray(query)
	if not hit.is_empty():
		destination = start + forward * maxf(0, start.distance_to(hit.position) - 0.16)
	var grenade := RigidBody3D.new()
	grenade.set_script(Grenade)
	grenade.thrower = self
	grenade.position = world.to_local(destination)
	world.add_child(grenade)
	grenade.linear_velocity = forward * 12 + Vector3.UP * 3 + velocity
	grenade.angular_velocity = Vector3(5, 3, 2)
	grenade_cooldown = GRENADE_COOLDOWN
	return grenade

func take_damage(amount: float) -> void:
	if death_started or amount <= 0:
		return
	hp = maxf(0, hp - amount)
	if hp <= 0:
		_die()
	else:
		damage_feedback.hit(amount)

func _die() -> void:
	death_started = true
	damage_feedback.stop()
	velocity = Vector3.ZERO
	reloading = false
	gun.hide()
	flash.light_energy = 0
	weapon_anim.stop()
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
	# Original Half-Life player pain sample used as the death event vocal.
	Audio.play(self, "player/pl_pain7.wav", false, -8)
	Audio.play(self, "fvox/flatline.wav", false, -9)
	var layer := CanvasLayer.new()
	layer.layer = 5
	add_child(layer)
	death_overlay = ColorRect.new()
	death_overlay.color = Color(0, 0, 0, 0)
	death_overlay.mouse_filter = Control.MOUSE_FILTER_IGNORE
	layer.add_child(death_overlay)
	death_overlay.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	var tween := create_tween()
	tween.set_parallel(true)
	tween.tween_property(camera, "position:y", 0.22, 0.9).set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_IN)
	tween.tween_property(camera, "rotation:z", deg_to_rad(-75), 0.9)
	tween.tween_property(camera, "rotation:x", 0.08, 0.9)
	tween.tween_property(death_overlay, "color:a", 1.0, 1.8).set_delay(0.7)
	var message := Label.new()
	message.text = "SEI MORTO" if touch_mode else "SEI MORTO\nPremi R per ricominciare"
	message.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	message.add_theme_font_size_override("font_size", 36)
	message.modulate.a = 0
	layer.add_child(message)
	message.set_anchors_and_offsets_preset(Control.PRESET_CENTER)
	tween.tween_property(message, "modulate:a", 1.0, 0.5).set_delay(2.2)
	if touch_mode:
		var restart := Button.new()
		restart_button = restart
		restart.name = "RestartButton"
		restart.text = "RICOMINCIA"
		restart.add_theme_font_size_override("font_size", 28)
		layer.add_child(restart)
		restart.set_anchors_and_offsets_preset(Control.PRESET_CENTER)
		restart.offset_left = -150
		restart.offset_right = 150
		restart.offset_top = 90
		restart.offset_bottom = 162
		restart.disabled = true
		get_tree().create_timer(0.6).timeout.connect(func(): restart.disabled = false)
		restart.pressed.connect(func():
			restart.disabled = true
			get_tree().reload_current_scene())