extends CanvasLayer

const WATER_SURFACE_Y: float = 60.0

@onready var _oxygen_bar: ProgressBar = %OxygenBar
@onready var _health_bar: ProgressBar = %HealthBar
@onready var _hunger_bar: ProgressBar = %HungerBar

var _dolphin: Node3D = null
var _world_seed: int = 12345

var _info_panel: PanelContainer = null
var _depth_label: Label = null
var _biome_label: Label = null
var _compass_label: Label = null

var _biome_cache_pos: Vector3 = Vector3(99999, 99999, 99999)
var _biome_cached_name: String = ""


func _ready() -> void:
	_style_bar(_oxygen_bar, Color(0.31, 0.76, 0.97))
	_style_bar(_health_bar, Color(0.91, 0.30, 0.24))
	_style_bar(_hunger_bar, Color(0.95, 0.61, 0.07))
	_build_info_panel()


func _build_info_panel() -> void:
	_info_panel = PanelContainer.new()
	_info_panel.anchor_left = 1.0
	_info_panel.anchor_right = 1.0
	_info_panel.anchor_top = 0.0
	_info_panel.anchor_bottom = 0.0
	_info_panel.offset_left = -220.0
	_info_panel.offset_top = 16.0
	_info_panel.offset_right = -16.0
	_info_panel.offset_bottom = 112.0

	var style := StyleBoxFlat.new()
	style.bg_color = Color(0.05, 0.05, 0.05, 0.7)
	style.corner_radius_top_left = 10
	style.corner_radius_top_right = 10
	style.corner_radius_bottom_left = 10
	style.corner_radius_bottom_right = 10
	_info_panel.add_theme_stylebox_override("panel", style)

	var vbox := VBoxContainer.new()
	vbox.add_theme_constant_override("separation", 4)
	_info_panel.add_child(vbox)

	_compass_label = Label.new()
	_compass_label.text = "⬆ N"
	_compass_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_compass_label.add_theme_font_size_override("font_size", 20)
	_compass_label.add_theme_color_override("font_color", Color(0.85, 0.95, 1.0))
	vbox.add_child(_compass_label)

	_depth_label = Label.new()
	_depth_label.text = "Prof. 0 m"
	_depth_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_depth_label.add_theme_font_size_override("font_size", 14)
	_depth_label.add_theme_color_override("font_color", Color(0.70, 0.88, 1.0))
	vbox.add_child(_depth_label)

	_biome_label = Label.new()
	_biome_label.text = "Biome : —"
	_biome_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_biome_label.add_theme_font_size_override("font_size", 14)
	_biome_label.add_theme_color_override("font_color", Color(0.85, 0.95, 0.75))
	vbox.add_child(_biome_label)

	add_child(_info_panel)


func _style_bar(bar: ProgressBar, color: Color) -> void:
	var style := StyleBoxFlat.new()
	style.bg_color = color
	style.corner_radius_top_left = 4
	style.corner_radius_top_right = 4
	style.corner_radius_bottom_left = 4
	style.corner_radius_bottom_right = 4
	bar.add_theme_stylebox_override("fill", style)

	var bg_style := StyleBoxFlat.new()
	bg_style.bg_color = Color(0.1, 0.1, 0.1, 0.6)
	bg_style.corner_radius_top_left = 4
	bg_style.corner_radius_top_right = 4
	bg_style.corner_radius_bottom_left = 4
	bg_style.corner_radius_bottom_right = 4
	bar.add_theme_stylebox_override("background", bg_style)


func connect_to_dolphin(dolphin: CharacterBody3D) -> void:
	dolphin.stats_changed.connect(_on_stats_changed)
	_dolphin = dolphin

	var main: Node = get_tree().get_first_node_in_group("main")
	if main != null:
		var cm: Node = main.get_node_or_null("World/ChunkManager")
		if cm != null and cm.get("world_seed") != null:
			_world_seed = cm.world_seed


func _on_stats_changed(oxygen: float, hp: float, hunger: float) -> void:
	_oxygen_bar.value = oxygen
	_health_bar.value = hp
	_hunger_bar.value = hunger


func _process(_delta: float) -> void:
	if not is_instance_valid(_dolphin):
		return

	var depth_m: int = int(round(WATER_SURFACE_Y - _dolphin.global_position.y))
	if _depth_label != null:
		_depth_label.text = "Prof. %d m" % depth_m

	if _compass_label != null:
		_compass_label.text = _compass_text(_dolphin.rotation.y)

	if _biome_label != null:
		_update_biome_label()


func _compass_text(yaw: float) -> String:
	# Player forward is -Z when yaw=0 → North. Yaw rotates counterclockwise in Godot.
	# Convert yaw to a heading [0, 360) where 0 = North, 90 = East.
	var heading: float = rad_to_deg(-yaw)
	heading = fposmod(heading, 360.0)

	var labels: PackedStringArray = PackedStringArray(["N", "NE", "E", "SE", "S", "SO", "O", "NO"])
	var arrows: PackedStringArray = PackedStringArray([
		"⬆", "⬈", "➡", "⬊", "⬇", "⬋", "⬅", "⬉"
	])
	var idx: int = int(round(heading / 45.0)) % 8
	return "%s %s" % [arrows[idx], labels[idx]]


func _update_biome_label() -> void:
	var pos: Vector3 = _dolphin.global_position
	if pos.distance_to(_biome_cache_pos) < 4.0 and _biome_cached_name != "":
		_biome_label.text = "Biome : %s" % _biome_cached_name
		return
	_biome_cache_pos = pos
	_biome_cached_name = WorldGenerator.biome_name_at(pos.x, pos.z, pos.y, _world_seed)
	_biome_label.text = "Biome : %s" % _biome_cached_name