# tests/integration/save_rng_roundtrip_test.gd — L2 集成用例：存档 ⇄ RNG 快照往返
# 跨系统面 = SaveManager（落盘 + 版本迁移链）× AdventureRunner（断点消费）×
#            RngService（种子/取数号位续跑）× BoardGenerator（开板确定性）。
# 与 tests/unit/core/breakpoint_resume_test.gd 的分工：那件是单测，只验「断点写读 + 首战开板一致」；
# 本件验的是**跨系统闭环**——盘上往返（含旧版本档经迁移链）之后，断点仍能被冒险层消费且 RNG 续跑
# 零跳号，是「玩家的旧存档还能不能接着打」这条真实路径。
# 运行：godot --headless --path game --script res://tests/integration/save_rng_roundtrip_test.gd
extends SceneTree

const SaveManagerScript := preload("res://core/save_manager.gd")
const AdventureRunnerScript := preload("res://core/adventure_runner.gd")
const RngServiceScript := preload("res://core/rng_service.gd")
const Kit := preload("res://tests/unit/test_kit.gd")

const SEED := 4242
const SAVE_PATH := "user://test_integration_save_rng.json"

var _db: ConfigDb
var _disk: String


func _init() -> void:
	_disk = ProjectSettings.globalize_path(SAVE_PATH)
	_clear_disk()
	_db = load("res://core/config_db.gd").new() as ConfigDb
	if not _db.load_tables("res://data/tables", false):
		Kit.check("数值表加载", false)
		quit(Kit.finish("save_rng_roundtrip"))
		return
	_test_disk_roundtrip_preserves_breakpoint()
	_test_old_version_save_migrates_and_resumes()
	_clear_disk()
	quit(Kit.finish("save_rng_roundtrip"))


# ---- 用例一：盘上往返保真——写档再读回，断点逐键零漂移 ----
func _test_disk_roundtrip_preserves_breakpoint() -> void:
	var rng := RngServiceScript.new()
	var sm := SaveManagerScript.new(SAVE_PATH)
	var adr := AdventureRunnerScript.new(_db, rng)
	adr.set_save_manager(sm)
	Kit.check_quiet(adr.start_adventure(SEED, {"hero_override": {}, "treasure_unlocked": {}}),
		"往返用例：冒险启动")
	Kit.check_quiet(sm.has_breakpoint(), "往返用例：入口停点断点在档")
	Kit.check_quiet(sm.write_to_disk(), "往返用例：断点写盘")

	var before: Dictionary = sm.breakpoint_snapshot()
	var sm2 := SaveManagerScript.new(SAVE_PATH)
	Kit.check_quiet(sm2.load_from_disk(), "往返用例：自盘读回受理")
	Kit.check_quiet(sm2.has_breakpoint(), "往返用例：读回后断点仍在档")
	var after: Dictionary = sm2.breakpoint_snapshot()
	Kit.check_quiet(int(after.get("master_seed", 0)) == SEED, "往返用例：主种子往返保真")
	Kit.check_quiet(int(after.get("rng_counter", -1)) == int(before.get("rng_counter", -2)),
		"往返用例：RNG 取数号位往返保真（存档不得重耗/跳号）")
	var bonus_before: Dictionary = before.get("bonus", {}) as Dictionary
	var bonus_after: Dictionary = after.get("bonus", {}) as Dictionary
	var bonus_same := bonus_after.size() == bonus_before.size()
	for k in bonus_before:
		if int(bonus_after.get(k, -99999)) != int(bonus_before[k]):
			bonus_same = false
	Kit.check_quiet(bonus_same, "往返用例：永久强化账本往返保真（逐键比整数值——JSON 往返不改值）")
	Kit.check_quiet(int(after.get("hero_hp", -1)) == int(before.get("hero_hp", -2)),
		"往返用例：生命账本往返保真")


# ---- 用例二：旧版本档经迁移链后仍可续玩（单测不覆盖的跨系统集成面）----
func _test_old_version_save_migrates_and_resumes() -> void:
	var rng := RngServiceScript.new()
	var sm := SaveManagerScript.new(SAVE_PATH)
	var adr := AdventureRunnerScript.new(_db, rng)
	adr.set_save_manager(sm)
	if not adr.start_adventure(SEED, {"hero_override": {}, "treasure_unlocked": {}}):
		Kit.check("旧档用例：冒险启动前置", false)
		return
	var runner = adr.runner()
	var c0: int = rng.counter()
	var cand: Array = runner.next_candidate_ids()
	if cand.is_empty():
		Kit.check("旧档用例：入口停点有候选路", false)
		return
	var fp_before := _board_fingerprint(runner)
	var hp_before: int = runner.hero_hp
	sm.write_to_disk()

	# 降级为上一版格式档：抹掉当前版本新增域并回退版本号，模拟玩家手里的旧档。
	var raw := FileAccess.get_file_as_string(_disk)
	var parsed: Variant = JSON.parse_string(raw)
	if not (parsed is Dictionary):
		Kit.check("旧档用例：盘上档可解析", false)
		return
	var old: Dictionary = (parsed as Dictionary).duplicate(true)
	old["version"] = 6
	var meta: Dictionary = old.get("meta", {}) as Dictionary
	meta.erase("forge_routes")
	old["meta"] = meta
	var f := FileAccess.open(_disk, FileAccess.WRITE)
	if f == null:
		Kit.check("旧档用例：旧档可落盘", false)
		return
	f.store_string(JSON.stringify(old))
	f.close()

	var sm_old := SaveManagerScript.new(SAVE_PATH)
	Kit.check_quiet(sm_old.load_from_disk(), "旧档用例：旧档经迁移链可载")
	Kit.check_quiet(sm_old.has_breakpoint(), "旧档用例：迁移后断点未被迁移链吃掉")
	var forge: Dictionary = sm_old.forge_routes_snapshot()
	Kit.check_quiet(str(forge.get("weapon", "")) == "sword",
		"旧档用例：迁移补齐当前版本新增域（缺 forge_routes 的旧档按初始持有态可玩）")

	# 旧档断点仍能被冒险层消费，且 RNG 续跑零跳号、开板与中断前逐位一致
	var bp: Dictionary = sm_old.breakpoint_snapshot()
	var rng2 := RngServiceScript.new()
	var adr2 := AdventureRunnerScript.new(_db, rng2)
	Kit.check_quiet(adr2.resume_adventure(bp, {"hero_override": {}, "treasure_unlocked": {}}),
		"旧档用例：旧档断点续玩受理")
	Kit.check_quiet(int(adr2.master_seed) == SEED, "旧档用例：续玩主种子回填")
	Kit.check_quiet(rng2.counter() == c0, "旧档用例：续玩取数号位 = 断点号位（零重耗零跳号）")
	var runner2 = adr2.runner()
	Kit.check_quiet(runner2.hero_hp == hp_before, "旧档用例：续玩生命账本回填")
	Kit.check_quiet(_board_fingerprint(runner2) == fp_before,
		"旧档用例：续玩停点态与中断前逐位一致")


func _board_fingerprint(runner) -> String:
	# 停点态指纹：候选路 + 生命 + 取数号位（无战斗对象时的可比面）
	var cand: Array = runner.next_candidate_ids()
	return "%s|%d" % [str(cand), runner.hero_hp]


func _clear_disk() -> void:
	if FileAccess.file_exists(_disk):
		DirAccess.remove_absolute(_disk)