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; Esc releases the mouse (click recaptures).
##
## Melee is a `Weapon` resource (stats + the weapon-vs-material matrix + a swing
## archetype) and the arms are a rigged `ViewModel`. Swapping weapon swaps both; movement
## never changes.
##
## The hit does NOT land on the click — it lands at `weapon.contact` through the swing
## animation. That single delay is most of why a sledgehammer feels different from a box
## cutter: you commit, then it connects.
##
## 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 grab: GrabController             # the record grab/extract/throw hands
var viewmodel: ViewModel             # the arms + weapon rig

var _head: Node3D
var _pitch := 0.0
var _cd_left := 0.0

# --- loadout -------------------------------------------------------------
var _loadout: Array[Weapon] = []
var _slot := 0
var _prev_slot := 0

# --- swing scheduling ----------------------------------------------------
var _queued := false                 # a click waiting for the cooldown
var _swing_left := -1.0              # seconds until this swing's contact frame
var _swinging: Weapon = null

# --- feel bookkeeping ----------------------------------------------------
var _look_delta := Vector2.ZERO       # mouse motion this frame, fed to viewmodel sway
var _was_on_floor := true
var _fall_speed := 0.0

signal weapon_changed(w: Weapon)
signal hit_landed(node: Node, w: Weapon)
signal swung(w: Weapon)

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
	camera.near = 0.03                  # the viewmodel sits ~40 cm out; don't clip it

	_loadout = Weapon.loadout()

	viewmodel = ViewModel.new()
	viewmodel.setup(camera)             # parents itself to the camera
	viewmodel.equip(_loadout[_slot])

	_build_crosshair()

	# the record ritual hands: a child node that owns a hold point under the camera
	grab = GrabController.new()
	add_child(grab)
	grab.setup(camera)

	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	weapon_changed.emit(_loadout[_slot])

# ---------------------------------------------------------------- loadout
func weapon() -> Weapon:
	return _loadout[_slot]

func loadout() -> Array[Weapon]:
	return _loadout

func slot() -> int:
	return _slot

func select(i: int) -> void:
	if i < 0 or i >= _loadout.size() or i == _slot:
		return
	if viewmodel != null and viewmodel.is_swapping():
		return
	_prev_slot = _slot
	_slot = i
	_queued = false
	_swing_left = -1.0
	_swinging = null
	if viewmodel != null:
		viewmodel.request_swap(_loadout[_slot])
	weapon_changed.emit(_loadout[_slot])

func cycle(step: int) -> void:
	select(posmod(_slot + step, _loadout.size()))

func quick_swap() -> void:
	select(_prev_slot)

# ---------------------------------------------------------------- crosshair
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:
		var mm := event as InputEventMouseMotion
		_look_delta += mm.relative * 0.01
		# while pulling a disc out, horizontal drag slides the disc (yaw is suspended);
		# vertical still looks up/down so you're never fully locked.
		if grab != null and grab.is_extracting():
			grab.feed_drag(mm.relative.x)
		else:
			rotate_y(-mm.relative.x * mouse_sensitivity)   # yaw on the body only
		_pitch = clamp(
			_pitch - mm.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:
		var mb := event as InputEventMouseButton
		if Input.mouse_mode != Input.MOUSE_MODE_CAPTURED:
			Input.mouse_mode = Input.MOUSE_MODE_CAPTURED   # click recaptures; not an attack
			return
		match mb.button_index:
			MOUSE_BUTTON_LEFT:
				# holding a record? LMB throws the disc / trashes the sleeve, not a swing.
				if grab != null and grab.is_holding():
					grab.primary()
				else:
					_queued = true
			MOUSE_BUTTON_WHEEL_UP:
				cycle(-1)
			MOUSE_BUTTON_WHEEL_DOWN:
				cycle(1)
		return

	if event is InputEventKey and event.pressed and not event.echo:
		var k := (event as InputEventKey).keycode
		if k == KEY_ESCAPE:
			Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
		elif k == KEY_E and grab != null:
			grab.try_grab()            # grab the record under the crosshair
		elif k == KEY_G and grab != null:
			grab.drop()                # drop / trash whatever's in hand
		elif k == KEY_Q:
			quick_swap()
		elif k >= KEY_1 and k <= KEY_6:
			select(k - KEY_1)

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

	# --- start a swing when the cooldown allows ---
	if _queued and _cd_left <= 0.0 and (viewmodel == null or not viewmodel.is_swapping()):
		_queued = false
		var w := weapon()
		_cd_left = w.cooldown
		_swinging = w
		_swing_left = w.swing_time * w.contact
		if viewmodel != null:
			viewmodel.start_swing()
		swung.emit(w)

	# --- land the hit at the contact frame, not on the click ---
	if _swing_left >= 0.0:
		_swing_left -= delta
		if _swing_left <= 0.0:
			var w := _swinging
			_swing_left = -1.0
			_swinging = null
			if w != null:
				var hit := _strike(w)
				if hit != null:
					hit_landed.emit(hit, w)

	# gravity (only off the floor, or it accumulates and you rocket downward)
	if not is_on_floor():
		velocity += get_gravity() * delta
		_fall_speed = maxf(_fall_speed, -velocity.y)
	elif not _was_on_floor:
		if viewmodel != null:
			viewmodel.land(_fall_speed)
		_fall_speed = 0.0
	_was_on_floor = is_on_floor()

	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()

func _process(dt: float) -> void:
	if viewmodel != null:
		var planar := Vector2(velocity.x, velocity.z).length()
		viewmodel.drive(_look_delta, planar, is_on_floor(), dt)
	_look_delta = _look_delta.lerp(Vector2.ZERO, clampf(dt * 14.0, 0.0, 1.0))

# ---------------------------------------------------------------- the hit
## Forgiving SPHERE query from the camera centre (the crosshair), so melee doesn't need
## pixel aim. intersect_shape is NOT distance-sorted, so pick the nearest collider.
## Runs from _physics_process, where direct_space_state is valid.
func _strike(w: Weapon) -> Node:
	var space := get_world_3d().direct_space_state
	if space == null:
		return null
	var origin := camera.global_position
	var dir := -camera.global_transform.basis.z

	var sphere := SphereShape3D.new()
	sphere.radius = w.radius
	var params := PhysicsShapeQueryParameters3D.new()
	params.shape = sphere
	params.transform = Transform3D(Basis.IDENTITY, origin + dir * w.reach)
	params.collide_with_bodies = true
	params.collide_with_areas = false
	params.exclude = [get_rid()]

	var hits := space.intersect_shape(params, 8)
	if hits.is_empty():
		return null

	var best: Node = null
	var best_d := INF
	for h in hits:
		var c = h.get("collider")
		if c == null or not (c is Node3D):
			continue
		var d: float = (c.global_position - origin).length_squared()
		if d < best_d:
			best_d = d
			best = c

	if best == null:
		return null

	# Smashable extends RigidBody3D, so this branch MUST come first or we'd only shove
	# props around and never break them.
	if best is Smashable:
		var s := best as Smashable
		s.smash(dir * w.impulse, w.damage_against(s.kind))
	elif best is RigidBody3D:
		var hit_pos: Vector3 = origin + dir * w.reach
		(best as RigidBody3D).apply_impulse(dir * w.knockback,
			hit_pos - (best as RigidBody3D).global_position)
	return best