from scripts import bump_dataset_version

plan_bump_gen = bump_dataset_version.plan_bump_gen
plan_bump_schema = bump_dataset_version.plan_bump_schema
apply_bump = bump_dataset_version.apply_bump


def test_bump_gen_starts_at_gen1_when_none_exist(tmp_path):
    dirs, log_line = plan_bump_gen(tmp_path, "steps", "first generation", None, "2026-01-01")
    assert dirs == [
        tmp_path / "raw" / "steps" / "gen1",
        tmp_path / "processed" / "steps" / "gen1" / "schema1",
    ]
    assert "`gen1`" in log_line
    assert "first generation" in log_line


def test_bump_gen_increments_past_existing(tmp_path):
    (tmp_path / "raw" / "steps" / "gen1").mkdir(parents=True)
    (tmp_path / "raw" / "steps" / "gen2").mkdir(parents=True)
    dirs, _ = plan_bump_gen(tmp_path, "steps", "next gen", None, "2026-01-01")
    assert dirs[0] == tmp_path / "raw" / "steps" / "gen3"


def test_bump_gen_checks_both_raw_and_processed_trees(tmp_path):
    # processed/ is ahead of raw/ — next gen must still be past the max of both.
    (tmp_path / "raw" / "steps" / "gen1").mkdir(parents=True)
    (tmp_path / "processed" / "steps" / "gen4" / "schema1").mkdir(parents=True)
    dirs, _ = plan_bump_gen(tmp_path, "steps", "next gen", None, "2026-01-01")
    assert dirs[0] == tmp_path / "raw" / "steps" / "gen5"


def test_bump_gen_kinds_are_independent(tmp_path):
    (tmp_path / "raw" / "steps" / "gen5").mkdir(parents=True)
    dirs, _ = plan_bump_gen(tmp_path, "hits", "first hits gen", None, "2026-01-01")
    assert dirs[0] == tmp_path / "raw" / "hits" / "gen1"


def test_bump_schema_starts_at_schema1_for_a_fresh_gen(tmp_path):
    (tmp_path / "raw" / "steps" / "gen1").mkdir(parents=True)
    dirs, log_line = plan_bump_schema(
        tmp_path, "steps", "gen1", "added e_sec column", None, "2026-01-01"
    )
    assert dirs == [tmp_path / "processed" / "steps" / "gen1" / "schema1"]
    assert "`gen1`/`schema1`" in log_line


def test_bump_schema_increments_within_its_gen(tmp_path):
    (tmp_path / "processed" / "steps" / "gen1" / "schema1").mkdir(parents=True)
    (tmp_path / "processed" / "steps" / "gen1" / "schema2").mkdir(parents=True)
    dirs, _ = plan_bump_schema(tmp_path, "steps", "gen1", "next schema", None, "2026-01-01")
    assert dirs == [tmp_path / "processed" / "steps" / "gen1" / "schema3"]


def test_bump_schema_does_not_see_other_gens_schemas(tmp_path):
    (tmp_path / "processed" / "steps" / "gen1" / "schema5").mkdir(parents=True)
    (tmp_path / "raw" / "steps" / "gen2").mkdir(parents=True)
    dirs, _ = plan_bump_schema(tmp_path, "steps", "gen2", "fresh schema for gen2", None, "2026-01-01")
    assert dirs == [tmp_path / "processed" / "steps" / "gen2" / "schema1"]


def test_bump_schema_rejects_nonexistent_gen(tmp_path):
    try:
        plan_bump_schema(tmp_path, "steps", "gen9", "oops", None, "2026-01-01")
        assert False, "expected SystemExit"
    except SystemExit:
        pass


def test_apply_bump_creates_dirs_and_appends_log(tmp_path):
    dirs, log_line = plan_bump_gen(tmp_path, "steps", "reason A", "alice", "2026-01-01")
    apply_bump(tmp_path, dirs, log_line)
    for d in dirs:
        assert d.is_dir()
    text = (tmp_path / "VERSIONS.md").read_text()
    assert "reason A" in text
    assert "alice" in text


def test_apply_bump_appends_without_clobbering_existing_log(tmp_path):
    (tmp_path / "VERSIONS.md").write_text("# Dataset versions\n\n- existing entry\n")
    dirs, log_line = plan_bump_gen(tmp_path, "steps", "reason B", None, "2026-01-02")
    apply_bump(tmp_path, dirs, log_line)
    text = (tmp_path / "VERSIONS.md").read_text()
    assert "existing entry" in text
    assert "reason B" in text