extends GutTest
## Tests de SaveMigration : garde-fous sur la version de schema.


func test_current_version_is_returned_unchanged() -> void:
    var data := {"schema_version": 2, "profile_id": "profile_test", "mission_results": {}}
    var migrated := SaveMigration.migrate(data)
    assert_eq(migrated["schema_version"], 2)
    assert_eq(migrated["profile_id"], "profile_test")


func test_version_1_save_gains_empty_mission_results_and_keeps_its_stars() -> void:
    var data := SaveFactory.new_save("profile_test", "Explorateur", "CE1")
    data["schema_version"] = 1
    data.erase("mission_results")
    data["rewards"] = {"stars": 4, "items": ["item_a"]}

    var migrated := SaveMigration.migrate(data)

    assert_eq(migrated["schema_version"], 2)
    assert_eq(migrated["mission_results"], {})
    assert_eq(migrated["rewards"], {"stars": 4, "items": ["item_a"]})
    assert_eq(SchemaValidator.validate(migrated, DataLoader.load_schema("save")), [])


func test_missing_version_is_rejected() -> void:
    var data := {"profile_id": "profile_test"}
    assert_eq(SaveMigration.migrate(data), {})


func test_future_unknown_version_is_rejected_rather_than_guessed() -> void:
    var data := {"schema_version": 99, "profile_id": "profile_test"}
    assert_eq(SaveMigration.migrate(data), {})


func test_zero_or_negative_version_is_rejected() -> void:
    var data := {"schema_version": 0, "profile_id": "profile_test"}
    assert_eq(SaveMigration.migrate(data), {})


func test_non_numeric_version_is_rejected() -> void:
    var data := {"schema_version": "one", "profile_id": "profile_test"}
    assert_eq(SaveMigration.migrate(data), {})


func test_migration_does_not_mutate_the_input_in_place() -> void:
    var data := {"schema_version": 1, "profile_id": "profile_test"}
    var migrated := SaveMigration.migrate(data)
    migrated["profile_id"] = "changed"
    assert_eq(data["profile_id"], "profile_test")