extends RefCounted
## Sparse whole typed captures. No acceptance flags and no truncation.
const Codec := preload("res://tests/fixtures/p08-02/mixed_world.gd")
var directory: String
var manifest: FileAccess

func open(path: String) -> bool:
	directory = path
	if DirAccess.dir_exists_absolute(path):
		return false
	if DirAccess.make_dir_recursive_absolute(path.path_join("objects")) != OK:
		return false
	manifest = FileAccess.open(path.path_join("manifest.jsonl"), FileAccess.WRITE)
	return manifest != null

func object(value: Variant) -> String:
	var text := JSON.stringify(Codec.new().typed(value)) + "\n"
	var digest := text.sha256_text()
	var path := directory.path_join("objects").path_join(digest + ".json")
	if FileAccess.file_exists(path):
		return digest if FileAccess.get_sha256(path) == digest else ""
	var file := FileAccess.open(path, FileAccess.WRITE)
	if file == null:
		return ""
	file.store_string(text)
	file.close()
	return digest if FileAccess.get_sha256(path) == digest else ""

func capture(label: String, runtime: Variant, view: WorldPreview) -> bool:
	if manifest == null:
		return false
	var state: Dictionary = runtime.create_snapshot()
	var report := view.get_life_observation_report()
	var state_hash := object(state)
	var report_hash := object(report)
	if state_hash.is_empty() or report_hash.is_empty():
		return false
	manifest.store_line(JSON.stringify({"label": label, "pid": OS.get_process_id(),
		"ticks_usec": Time.get_ticks_usec(), "state": state_hash, "report": report_hash,
		"input_method": "diagnostic", "acceptance": "pending"}))
	manifest.flush()
	return var_to_bytes(state) == var_to_bytes(runtime.create_snapshot())

func close() -> void:
	if manifest != null:
		manifest.close()
		manifest = null

func record(label: String, value: Dictionary) -> bool:
	if manifest == null: return false
	var digest := object(value)
	if digest.is_empty(): return false
	manifest.store_line(JSON.stringify({"label": label, "pid": OS.get_process_id(),
		"ticks_usec": Time.get_ticks_usec(), "object": digest}))
	manifest.flush()
	return true