extends Node
class_name TerminalControls

@onready var historyContainer = $MarginContainer/ScrollContainer/VBoxContainer
@onready var caret = $MarginContainer/ScrollContainer/VBoxContainer/Label/Caret
@onready var blink_timer = $MarginContainer/ScrollContainer/VBoxContainer/Label/CaretTimer
@export var terminalLine: Label 

var command: String
var directory: String = "~/"
var fileSystem: Dictionary = {
	"documents": {
		"special": {
			"notes.txt": "test",
			"secrets": {
				"password.txt": 123
			}
		}
	},
	"bin": {
		"sh": "binary data",
	}
}

func _ready() -> void:
	terminalLine.text = "user@work "+ directory + " "
	UpdateCaretPos()
	blink_timer.start()

# --- Caret Blinking Logic ---
func _on_caret_timer_timeout() -> void:
	caret.visible = !caret.visible

func reset_blink() -> void:
	caret.visible = true
	blink_timer.start() # Resets the countdown

# --- Input Handling ---
func InputChar(input) -> void:
	if input == null:
		return
	command = input
	terminalLine.text += command		
	UpdateCaretPos()
	reset_blink()
func InputDelChar() -> void:
	if terminalLine.text.length() > ("user@work " + directory).length() + 1:
		terminalLine.text = terminalLine.text.left(-1)
		UpdateCaretPos()
		reset_blink()

func EnterCommand() -> void:
	var fullText = terminalLine.text
	var userInput = fullText.trim_prefix("user@work " + directory).strip_edges()
	
	if historyContainer.get_child_count() <22:
		CreateHistoryEntry(fullText)
	var parts = userInput.split(" ")
	
	match parts[0]:
		"ls":
			var currentDirData
			if parts.size() > 1:
				currentDirData = GetDirAtPath(directory + parts[1])
			else:
				currentDirData = GetDirAtPath(directory)
			if currentDirData is Dictionary:
				var list = ""
				for key in currentDirData.keys():
					list += key + "  "
				CreateHistoryEntry(list)
			else:
				CreateHistoryEntry("error: Directory not found")
		"cd":
			if parts.size() > 1:
				var targetPath = parts[1]
				var newDir = ResolvePath(directory, targetPath)
				if GetDirAtPath(newDir) != null:
					directory = newDir
				else:
					CreateHistoryEntry("cd: no such directory: "  + targetPath)
			else:
				directory = "~/"
		"cat":
			if parts.size() > 1:
				RetrieveData(parts[1])
			else: 
				CreateHistoryEntry("usage: cat [filename]")
		"clear":
			for child in historyContainer.get_children():
				if child != terminalLine:
					child.queue_free()
		"": 
			pass
		_:
			CreateHistoryEntry("Command not found: " + userInput)		
			
	terminalLine.text = "user@work "+ directory + " "
	
	# Handle UI scrolling correctly
	
	var scrollBox = historyContainer.get_parent() as ScrollContainer
	historyContainer.force_update_transform()
	await get_tree().process_frame
	scrollBox.scroll_vertical = int(scrollBox.get_v_scroll_bar().max_value)
	UpdateCaretPos()

# --- History and FileSystem Helpers ---
func CreateHistoryEntry(content: String) -> void:
	var label = Label.new()
	label.text = content
	label.label_settings = LabelSettings.new()
	label.label_settings.font_size = 42
	label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	label.custom_minimum_size = Vector2(1400, 0)
	
	if terminalLine.text.length() > 200:
		for child in historyContainer.get_children():
			if child != terminalLine:
				child.queue_free()
	historyContainer.add_child(label)
	historyContainer.move_child(label, historyContainer.get_child_count() - 2)
	
	# Limit history to 15 entries + 1 active line
	if historyContainer.get_child_count() > 22:
		historyContainer.get_child(0).queue_free()

func ResolvePath(current: String, target: String) -> String:
	if target.begins_with("~/"):
		return target if target.ends_with("/") else target + "/"
	if target == "..":
		if current == "~/": return "~/"
		var parts = current.trim_suffix("/").rsplit("/", true, 1)
		return parts[0] + "/"
	var joined = current + target
	return joined if joined.ends_with("/") else joined + "/"

func GetDirAtPath(path: String):
	if path == "~/": return fileSystem
	var cleanPath = path.trim_prefix("~/").trim_suffix("/")
	var folders = cleanPath.split("/")
	var current = fileSystem
	for folder in folders:
		if current is Dictionary and current.has(folder) and current[folder] is Dictionary:
			current = current[folder]
		else:
			return null
	return current if current is Dictionary else null

func RetrieveData(filename: String):
	var currentData = GetDirAtPath(directory)
	if currentData == null:
		CreateHistoryEntry("Error: Current directory invalid.")
		return
	if currentData.has(filename):
		var content = currentData[filename]
		if content is Dictionary:
			CreateHistoryEntry("cat: " + filename + ": is a directory")
		else:
			CreateHistoryEntry(str(content))
	else:
		CreateHistoryEntry("cat: " + filename + ": no such file")

func UpdateCaretPos():
	var last_char_index = terminalLine.text.length() - 1
	var char_rect = terminalLine.get_character_bounds(max(0, last_char_index))
	caret.position.x = char_rect.end.x + 1
	caret.position.y = char_rect.position.y