class_name Player extends CharacterBody2D


const SPEED = 300.0
const JUMP_VELOCITY = -400.0

@onready var right_cast: RayCast2D = $RightCast
@onready var left_cast: RayCast2D = $LeftCast
@onready var right_spawn: Node2D = $RightSpawn
@onready var left_spawn: Node2D = $LeftSpawn
@onready var player_graphic: AnimatedSprite2D = $PlayerGraphic


enum FaceDirection{LEFT, RIGHT}
var facing:FaceDirection = FaceDirection.RIGHT

enum State{IDLE, RUN, JUMP, FALLING, HURT, DEATH}
var current_state:State = State.IDLE

var pushTarget
var pushEnabled = false
var direction
var upJump = false

var gravity := ProjectSettings.get_setting("physics/2d/default_gravity") as float

var can_mount_stairs := false
var is_on_stairs := false
var stairs_z_above := 0     # filled by stairs trigger
var stairs_z_below := -1    # filled by stairs trigger
var stairs_node: Node = null

signal deathAnimationCompleteSignal

func _physics_process(delta: float) -> void:
	#game loop
	handle_input()
	#calculate the movement
	
		# --- STAIRS OPT-IN LOGIC ---
	if can_mount_stairs and not is_on_stairs:
		print("Player: inside stairs trigger, waiting for up/down")
	
	if Input.is_action_just_pressed("ui_up"):
		print("Player: ui_up pressed")
	if Input.is_action_just_pressed("ui_down"):
		print("Player: ui_down pressed")
	
	if Input.is_action_just_pressed("ui_up") or Input.is_action_just_pressed("ui_down"):
		print("Player: START stairs mode requested")
		_start_stairs_mode()
	# ---------------------------
	
	handle_movement(delta)
	#change states
	update_states()
	#play animations
	update_animation()
	#collision with objects, raycasts
	
		# Gravity
	if not is_on_floor():
		velocity.y += gravity * delta

	move_and_slide()
	handle_collisions()
	
func update_states():
	match current_state:
		#idle when movement in x
		State.IDLE when velocity.x !=0:
			current_state = State.RUN
		State.RUN:
			if velocity.x ==0:
				current_state = State.IDLE
		#jumping when reaching apex
		State.JUMP when velocity.y > 0:
			current_state = State.FALLING
		State.FALLING when is_on_floor():
			if velocity.x == 0:
				current_state = State.IDLE
			else:
				current_state = State.RUN
			
func update_animation():
	match current_state:
		State.IDLE:
			player_graphic.play("idle")
		State.RUN:
			player_graphic.play("run")
		State.JUMP:
			if upJump:
				player_graphic.play("jump")
		State.FALLING:
			player_graphic.play("falling")
		State.HURT:
			player_graphic.play("hurt")
		State.DEATH:
			player_graphic.play("death")
func handle_movement(delta): 
	# Add the gravity.
	if not is_on_floor():
		velocity += get_gravity() * delta
	
	if direction:
		velocity.x = direction * SPEED
		if direction <0:
				facing = FaceDirection.LEFT
				player_graphic.flip_h = true
		if direction >0:
			facing = FaceDirection.RIGHT
			player_graphic.flip_h = false
	else:
		velocity.x = move_toward(velocity.x, 0, SPEED)
func handle_input():
	if Input.is_action_just_pressed("ui_accept") and is_on_floor():
		velocity.y = JUMP_VELOCITY
		current_state = State.JUMP
		upJump = true
		
	if Input.is_action_just_pressed("shove") && pushEnabled:
			print("shove pressed")
			if facing == FaceDirection.RIGHT:
				pushTarget.apply_central_impulse(Vector2(1,0)*700)
				pushEnabled = false
			if facing == FaceDirection.LEFT:
				pushTarget.apply_central_impulse(Vector2(-1,0)*700)
				pushEnabled = false
	
	if Input.is_action_just_pressed("shoot"):
			print("shoot a bullet")
			if facing == FaceDirection.RIGHT:
				%SceneManager.makeBullet(right_spawn.global_transform, 700)
			if facing == FaceDirection.LEFT:
				%SceneManager.makeBullet(left_spawn.global_transform, -700)

	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.
	direction = Input.get_axis("ui_left", "ui_right")
func handle_collisions():
	for i in get_slide_collision_count():
		var c = get_slide_collision(i)
		if c.get_collider() is RigidBody2D:
			c.get_collider().apply_central_impulse(-c.get_normal() * 100)
			
	if right_cast.is_colliding() && facing==FaceDirection.RIGHT:
			#get the thing I am colliding with
			var collider = right_cast.get_collider()
			if collider is Node && collider is RigidBody2D:
				print("I can shove this to the right")
				pushTarget = collider
				pushEnabled = true
	if not right_cast.is_colliding() && not left_cast.is_colliding():
		pushEnabled = false
	if left_cast.is_colliding() && facing==FaceDirection.LEFT:
			var collider = left_cast.get_collider()
			if collider is Node && collider is RigidBody2D:
					print("I can shove this to the left")
					pushTarget = collider
					pushEnabled = true
	if not left_cast.is_colliding() && not right_cast.is_colliding():
			pushEnabled = false


const STAIRS_LAYER := 3  # correct layer number for "stairs"

func _ready() -> void:
	_set_stair_collision(false)
	# Allow climbing up steeper slopes (default is ~45°)
	floor_max_angle = deg_to_rad(60)   # you can increase or decrease as needed

func _set_stair_collision(enabled: bool) -> void:
	print("[Player] set stair collision to:", enabled)
	set_collision_mask_value(STAIRS_LAYER, enabled)

func _start_stairs_mode() -> void:
	print("[Player] _start_stairs_mode")
	is_on_stairs = true
	_set_stair_collision(true)
	# When "on" the stairs, draw above (or tune based on your art)
	if stairs_node and stairs_node.has_method("get_above_z_index"):
		z_index = stairs_node.get_above_z_index()
	else:
		z_index = 5  # fallback

func _end_stairs_mode() -> void:
	print("[Player] _end_stairs_mode")
	is_on_stairs = false
	_set_stair_collision(false)
	# When not on stairs, draw behind (to appear "behind" stair art if overlapping)
	if stairs_node and stairs_node.has_method("get_below_z_index"):
		z_index = stairs_node.get_below_z_index()
	else:
		z_index = 0  # fallback
	stairs_node = null

# Called by the stairs trigger via signals:
func on_stairs_trigger_enter(stairs: Node, above_z: int, below_z: int) -> void:
	print("[Player] on_stairs_trigger_enter from:", stairs.name)
	can_mount_stairs = true
	stairs_node = stairs
	stairs_z_above = above_z
	stairs_z_below = below_z
	# By default when *not* mounted, draw behind:
	z_index = below_z

func on_stairs_trigger_exit(stairs: Node) -> void:
	print("[Player] on_stairs_trigger_exit from:", stairs.name)
	if stairs_node == stairs:
		can_mount_stairs = false

func on_stairs_top_reached(stairs: Node) -> void:
	print("[Player] on_stairs_top_reached from:", stairs.name)
	if stairs_node == stairs and is_on_stairs:
		_end_stairs_mode()

func _on_animation_finished() -> void:
	match current_state:
		State.JUMP:
			upJump = false
		State.HURT:
				current_state = State.IDLE
		State.DEATH:
			deathAnimationCompleteSignal.emit()
			
func playerTakesDamage(health):
	print("Player sees remaining health "+str(health))
	current_state = State.HURT

func playerDies():
	print("Player sees they died.")
	current_state = State.DEATH