class_name ApiClient
extends Node

const DEFAULT_TIMEOUT_SECONDS := 12.0

var base_url: String = ""
var timeout_seconds: float = DEFAULT_TIMEOUT_SECONDS


func _ready() -> void:
	base_url = str(ProjectSettings.get_setting("farm_game/api/base_url", ""))


func post_json(path: String, payload: Dictionary) -> Dictionary:
	var base_error := _ensure_base_url()
	if not base_error.is_empty():
		return base_error

	var request := HTTPRequest.new()
	request.timeout = timeout_seconds
	add_child(request)

	var url := _join_url(base_url, path)
	var body := _to_egret_msg_body(payload)
	var headers := PackedStringArray(["Content-Type: application/x-www-form-urlencoded"])
	var error := request.request(url, headers, HTTPClient.METHOD_POST, body)
	if error != OK:
		request.queue_free()
		return {
			"ok": false,
			"offline": false,
			"status": 0,
			"body": {},
			"text": "HTTPRequest failed to start: %s" % error
		}

	var response: Array = await request.request_completed
	request.queue_free()
	return _to_result(response)


func get_query(path: String, params: Dictionary = {}) -> Dictionary:
	var base_error := _ensure_base_url()
	if not base_error.is_empty():
		return base_error

	var request := HTTPRequest.new()
	request.timeout = timeout_seconds
	add_child(request)

	var url := _join_url(base_url, path)
	var query := _to_form_body(params)
	if not query.is_empty():
		url = "%s%s%s" % [url, "&" if url.contains("?") else "?", query]
	var error := request.request(url, PackedStringArray(), HTTPClient.METHOD_GET)
	if error != OK:
		request.queue_free()
		return {
			"ok": false,
			"offline": false,
			"status": 0,
			"body": {},
			"text": "HTTPRequest failed to start: %s" % error
		}

	var response: Array = await request.request_completed
	request.queue_free()
	return _to_result(response)


func post_form(path: String, payload: Dictionary) -> Dictionary:
	var base_error := _ensure_base_url()
	if not base_error.is_empty():
		return base_error

	var request := HTTPRequest.new()
	request.timeout = timeout_seconds
	add_child(request)

	var url := _join_url(base_url, path)
	var headers := PackedStringArray(["Content-Type: application/x-www-form-urlencoded"])
	var error := request.request(url, headers, HTTPClient.METHOD_POST, _to_form_body(payload))
	if error != OK:
		request.queue_free()
		return {
			"ok": false,
			"offline": false,
			"status": 0,
			"body": {},
			"text": "HTTPRequest failed to start: %s" % error
		}

	var response: Array = await request.request_completed
	request.queue_free()
	return _to_result(response)


func _ensure_base_url() -> Dictionary:
	if base_url.strip_edges().is_empty():
		base_url = str(ProjectSettings.get_setting("farm_game/api/base_url", ""))
	if not base_url.strip_edges().is_empty():
		return {}
	return {
		"ok": false,
		"offline": true,
		"status": 0,
		"body": {},
		"text": "API base URL is not configured."
	}


func _join_url(root: String, path: String) -> String:
	var normalized_root := root.strip_edges().trim_suffix("/")
	var normalized_path := path.strip_edges()
	if normalized_root.ends_with("=") or normalized_root.ends_with("?") or normalized_root.ends_with("&"):
		return normalized_root + normalized_path.trim_prefix("/")
	if not normalized_path.begins_with("/"):
		normalized_path = "/" + normalized_path
	return normalized_root + normalized_path


func _to_egret_msg_body(payload: Dictionary) -> String:
	var json := JSON.stringify(payload)
	var encoded := Marshalls.raw_to_base64(json.to_utf8_buffer()).uri_encode()
	return "msg=%s" % encoded


func _to_form_body(payload: Dictionary) -> String:
	var parts: Array[String] = []
	for key in payload.keys():
		var encoded_key := str(key).uri_encode()
		var encoded_value := str(payload.get(key, "")).uri_encode()
		parts.append("%s=%s" % [encoded_key, encoded_value])
	return "&".join(parts)


func _to_result(response: Array) -> Dictionary:
	var result: int = response[0]
	var status: int = response[1]
	var headers: PackedStringArray = response[2]
	var body: PackedByteArray = response[3]
	var text := body.get_string_from_utf8()
	var parsed = JSON.parse_string(text)
	if parsed == null:
		parsed = {}
	_decode_embedded_data(parsed)

	var http_ok := result == HTTPRequest.RESULT_SUCCESS and status >= 200 and status < 300
	var game_ok := true
	var game_status = null
	if parsed is Dictionary and parsed.has("status"):
		game_status = parsed.get("status")
		game_ok = int(game_status) == 0
	elif parsed is Dictionary and parsed.has("code"):
		game_status = parsed.get("code")
		game_ok = int(game_status) == 0

	return {
		"ok": http_ok and game_ok,
		"offline": false,
		"status": status,
		"game_status": game_status,
		"headers": headers,
		"body": parsed,
		"text": text
	}


func _decode_embedded_data(parsed: Variant) -> void:
	if not parsed is Dictionary:
		return
	if not parsed.has("data") or not parsed["data"] is String:
		return

	var decoded_text := Marshalls.base64_to_utf8(str(parsed["data"]).strip_edges())
	var decoded = JSON.parse_string(decoded_text)
	if decoded != null:
		parsed["data"] = decoded