extends CharacterBody3D
class_name Player

## First-person player for Destroyulator. Built entirely in code so Main.gd can
## spawn it where the old fixed Camera3D was and reuse `player.camera` for the
## crosshair raycast. Mouse-captured look, WASD move, Space jump; L-click PUNCH,
## R-click KICK; Esc releases the mouse (click recaptures).
##
## Melee is a swappable MeleeAttack resource (reach/radius/impulse/knockback/cooldown)
## so real weapons slot in by swapping the resource + viewmodel — movement never
## changes. Hits are fired from screen-center (the mouse is captured, so its position
## is meaningless) and resolved in _physics_process, where direct_space_state is valid.
##
## Godot 4.7 GDScript 2.0. No 3.x APIs: move_and_slide() takes no args and reads/writes
## `velocity`; get_gravity() supplies the project default; mouse_mode is a property.

@export var move_speed: float = 5.0
@export var accel: float = 12.0
@export var air_accel: float = 3.0
@export var jump_velocity: float = 4.5
@export var mouse_sensitivity: float = 0.0025   # radians per pixel of mouse motion
@export var pitch_limit_deg: float = 89.0
@export var eye_height: float = 1.6

var camera: Camera3D                 # Main reads this for the crosshair raycast

var _head: Node3D
var _hands_rig: Node3D               # cosmetic viewmodel (hands + leg), swung on attack
var _r_hand: MeshInstance3D
var _l_hand: MeshInstance3D
var _leg: MeshInstance3D
var _swing_tween: Tween

var _pitch := 0.0
var _cd_left := 0.0
var _queued: MeleeAttack = null      # buffered click, consumed next physics step

var _punch: MeleeAttack
var _kick: MeleeAttack

# resting local transforms of the viewmodel parts (relative to the camera)
const R_HAND_REST := Vector3(0.30, -0.32, -0.55)
const L_HAND_REST := Vector3(-0.30, -0.34, -0.58)
const LEG_REST := Vector3(0.06, -1.05, -0.42)

func _ready() -> void:
	# --- collision capsule (feet at the body origin) ---
	var col := CollisionShape3D.new()
	var cap := CapsuleShape3D.new()
	cap.radius = 0.35
	cap.height = 1.8
	col.shape = cap
	col.position = Vector3(0, 0.9, 0)   # capsule center at height/2 so feet sit at origin
	add_child(col)

	# --- head (pitch) + camera ---
	_head = Node3D.new()
	_head.name = "Head"
	_head.position = Vector3(0, eye_height, 0)
	add_child(_head)

	camera = Camera3D.new()
	camera.name = "Camera3D"
	_head.add_child(camera)
	camera.current = true

	_build_viewmodel()
	_build_crosshair()
	_make_attacks()

	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED

# ---------------------------------------------------------------- attacks
func _make_attacks() -> void:
	_punch = MeleeAttack.new()
	_punch.reach = 1.7
	_punch.radius = 0.34
	_punch.impulse = 6.0
	_punch.knockback = 2.5
	_punch.cooldown = 0.26

	_kick = MeleeAttack.new()
	_kick.reach = 2.2
	_kick.radius = 0.42
	_kick.impulse = 10.0
	_kick.knockback = 5.0
	_kick.cooldown = 0.48

# ---------------------------------------------------------------- viewmodel
func _build_viewmodel() -> void:
	_hands_rig = Node3D.new()
	_hands_rig.name = "ViewModel"
	camera.add_child(_hands_rig)

	var mat := StandardMaterial3D.new()
	# semi-opaque: BOTH the alpha mode AND alpha<1 are required (alpha alone renders opaque)
	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	mat.albedo_color = Color(0.86, 0.62, 0.5, 0.55)
	mat.no_depth_test = true                          # hands draw over world geo, never clip
	mat.render_priority = 1
	mat.cull_mode = BaseMaterial3D.CULL_DISABLED
	mat.roughness = 0.85

	_r_hand = _make_capsule(mat)
	_l_hand = _make_capsule(mat)
	_leg = _make_leg(mat)
	_hands_rig.add_child(_r_hand)
	_hands_rig.add_child(_l_hand)
	_hands_rig.add_child(_leg)

	_r_hand.position = R_HAND_REST
	_l_hand.position = L_HAND_REST
	_leg.position = LEG_REST
	_r_hand.rotation = Vector3(deg_to_rad(-70), 0.0, deg_to_rad(-12))
	_l_hand.rotation = Vector3(deg_to_rad(-70), 0.0, deg_to_rad(12))
	_leg.rotation = Vector3(deg_to_rad(-90), 0.0, 0.0)

func _make_capsule(mat: StandardMaterial3D) -> MeshInstance3D:
	var mi := MeshInstance3D.new()
	var cap := CapsuleMesh.new()
	cap.radius = 0.055
	cap.height = 0.20   # full height incl. the hemispherical caps
	mi.mesh = cap
	mi.material_override = mat
	mi.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	return mi

func _make_leg(mat: StandardMaterial3D) -> MeshInstance3D:
	var shin := MeshInstance3D.new()
	var cap := CapsuleMesh.new()
	cap.radius = 0.075
	cap.height = 0.34
	shin.mesh = cap
	shin.material_override = mat
	shin.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	var foot := MeshInstance3D.new()
	var box := BoxMesh.new()
	box.size = Vector3(0.11, 0.07, 0.22)
	foot.mesh = box
	foot.material_override = mat
	foot.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	foot.position = Vector3(0.0, -0.20, 0.09)
	shin.add_child(foot)
	return shin

func _build_crosshair() -> void:
	var layer := CanvasLayer.new()
	layer.name = "CrosshairLayer"
	add_child(layer)
	var dot := ColorRect.new()
	dot.color = Color(1, 1, 1, 0.85)
	dot.anchor_left = 0.5
	dot.anchor_top = 0.5
	dot.anchor_right = 0.5
	dot.anchor_bottom = 0.5
	dot.offset_left = -2
	dot.offset_top = -2
	dot.offset_right = 2
	dot.offset_bottom = 2
	layer.add_child(dot)

# ---------------------------------------------------------------- input
func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseMotion and Input.mouse_mode == Input.MOUSE_MODE_CAPTURED:
		rotate_y(-event.relative.x * mouse_sensitivity)   # yaw on the body only
		_pitch = clamp(
			_pitch - event.relative.y * mouse_sensitivity,
			deg_to_rad(-pitch_limit_deg), deg_to_rad(pitch_limit_deg))
		_head.rotation.x = _pitch                          # pitch on the head only
		return

	if event is InputEventMouseButton and event.pressed:
		if Input.mouse_mode != Input.MOUSE_MODE_CAPTURED:
			Input.mouse_mode = Input.MOUSE_MODE_CAPTURED   # click recaptures; this one isn't an attack
			return
		if event.button_index == MOUSE_BUTTON_LEFT:
			_queue_attack(_punch)
		elif event.button_index == MOUSE_BUTTON_RIGHT:
			_queue_attack(_kick)
		return

	if event is InputEventKey and event.pressed and not event.echo:
		if event.keycode == KEY_ESCAPE:
			Input.mouse_mode = Input.MOUSE_MODE_VISIBLE

func _queue_attack(atk: MeleeAttack) -> void:
	# buffer the click; the hit resolves in _physics_process where the space state is valid.
	if _cd_left <= 0.0:
		_queued = atk

# ---------------------------------------------------------------- physics / movement
func _physics_process(delta: float) -> void:
	_cd_left = max(0.0, _cd_left - delta)

	# resolve a buffered melee swing
	if _queued != null and _cd_left <= 0.0:
		var atk := _queued
		_queued = null
		_cd_left = atk.cooldown
		var origin := camera.global_position
		var dir := -camera.global_transform.basis.z   # camera forward = crosshair
		atk.strike(self, origin, dir, [get_rid()])
		_swing_viewmodel(atk == _kick)

	# gravity (only off the floor, or it accumulates and you rocket downward)
	if not is_on_floor():
		velocity += get_gravity() * delta

	if Input.is_key_pressed(KEY_SPACE) and is_on_floor():
		velocity.y = jump_velocity

	var input_dir := Vector2(
		float(Input.is_key_pressed(KEY_D)) - float(Input.is_key_pressed(KEY_A)),
		float(Input.is_key_pressed(KEY_S)) - float(Input.is_key_pressed(KEY_W)))
	var wish := transform.basis * Vector3(input_dir.x, 0.0, input_dir.y)
	wish.y = 0.0
	if wish.length() > 1.0:
		wish = wish.normalized()

	var target := wish * move_speed
	var a := accel if is_on_floor() else air_accel
	velocity.x = move_toward(velocity.x, target.x, a * move_speed * delta)
	velocity.z = move_toward(velocity.z, target.z, a * move_speed * delta)

	move_and_slide()

# ---------------------------------------------------------------- cosmetic swing
func _swing_viewmodel(is_kick: bool) -> void:
	if _swing_tween and _swing_tween.is_valid():
		_swing_tween.kill()   # interrupt any lingering swing so rapid clicks don't fight
	if is_kick:
		_leg.position = LEG_REST
		var up := LEG_REST + Vector3(0.0, 0.66, -0.12)
		_swing_tween = create_tween()
		_swing_tween.set_trans(Tween.TRANS_CUBIC).set_ease(Tween.EASE_OUT)
		_swing_tween.tween_property(_leg, "position", up, 0.10)
		_swing_tween.set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_IN)
		_swing_tween.tween_property(_leg, "position", LEG_REST, 0.20)
	else:
		_r_hand.position = R_HAND_REST
		var fwd := R_HAND_REST + Vector3(-0.06, 0.10, -0.34)
		_swing_tween = create_tween()
		_swing_tween.set_trans(Tween.TRANS_CUBIC).set_ease(Tween.EASE_OUT)
		_swing_tween.tween_property(_r_hand, "position", fwd, 0.08)
		_swing_tween.set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_IN)
		_swing_tween.tween_property(_r_hand, "position", R_HAND_REST, 0.16)