extends Node

signal profile_changed

const SAVE_PATH := "user://profile.json"

var profile: Dictionary = {
	"xp": 0,
	"level": 1,
	"current_streak": 0,
	"best_streak": 0,
	"badges": [],
	"completed_question_ids": [],
	"system_stats": {},
	"block_history": []
}

func _ready() -> void:
	load_profile()


func load_profile() -> void:
	if not FileAccess.file_exists(SAVE_PATH):
		save_profile()
		return

	var file := FileAccess.open(SAVE_PATH, FileAccess.READ)
	if file == null:
		push_error("Unable to open profile save.")
		return

	var parsed = JSON.parse_string(file.get_as_text())
	if typeof(parsed) == TYPE_DICTIONARY:
		for key in profile.keys():
			if parsed.has(key):
				profile[key] = parsed[key]
		profile_changed.emit()


func save_profile() -> void:
	var file := FileAccess.open(SAVE_PATH, FileAccess.WRITE)
	if file == null:
		push_error("Unable to write profile save.")
		return
	file.store_string(JSON.stringify(profile, "\t"))


func get_profile() -> Dictionary:
	return profile.duplicate(true)


func apply_block_results(results: Dictionary) -> void:
	profile["xp"] = int(profile["xp"]) + int(results.get("xp_earned", 0))
	profile["level"] = ProgressionService.level_for_xp(int(profile["xp"]))
	profile["current_streak"] = int(results.get("ending_streak", profile["current_streak"]))
	profile["best_streak"] = max(int(profile["best_streak"]), int(profile["current_streak"]))

	var unlocked_badges: Array = results.get("badges_unlocked", [])
	for badge in unlocked_badges:
		if not profile["badges"].has(badge):
			profile["badges"].append(badge)

	var answers: Array = results.get("answers", [])
	for answer in answers:
		var question: Dictionary = answer.get("question", {})
		var question_id := str(question.get("id", ""))
		if question_id != "" and not profile["completed_question_ids"].has(question_id):
			profile["completed_question_ids"].append(question_id)

		var system_name := str(question.get("system", "General"))
		if not profile["system_stats"].has(system_name):
			profile["system_stats"][system_name] = {"seen": 0, "correct": 0}
		profile["system_stats"][system_name]["seen"] = int(profile["system_stats"][system_name]["seen"]) + 1
		if bool(answer.get("is_correct", false)):
			profile["system_stats"][system_name]["correct"] = int(profile["system_stats"][system_name]["correct"]) + 1

	var summary: Dictionary = {
		"timestamp": Time.get_datetime_string_from_system(),
		"mode": results.get("mode", "Tutor"),
		"system": results.get("system", "All Systems"),
		"correct": results.get("correct", 0),
		"total": results.get("total", 0),
		"xp_earned": results.get("xp_earned", 0)
	}
	profile["block_history"].push_front(summary)
	if profile["block_history"].size() > 12:
		profile["block_history"].resize(12)

	save_profile()
	profile_changed.emit()


func reset_profile() -> void:
	profile = {
		"xp": 0,
		"level": 1,
		"current_streak": 0,
		"best_streak": 0,
		"badges": [],
		"completed_question_ids": [],
		"system_stats": {},
		"block_history": []
	}
	save_profile()
	profile_changed.emit()