from __future__ import annotations

import filecmp
from pathlib import Path

import pytest
import yaml

from infospace_bench import (
    ArchiveRecord,
    InfospaceError,
    RestoredArchive,
    add_artifact,
    annotate_retention,
    archive_infospace,
    create_infospace,
    list_archives,
    restore_archive,
)
from infospace_bench.archive import (
    ARCHIVE_INDEX_PATH,
    ARCHIVE_STORE_DIR,
    DEFAULT_RETENTION_CLASS,
    PRODUCER,
)


def _restored_paths_via_round_trip(
    record: ArchiveRecord, source: Path, tmp_path: Path
) -> list[str]:
    target = tmp_path / f"restore-{record.package_id[:8]}"
    result = restore_archive(
        record.package_id, target=target, source_infospace=source,
    )
    return list(result.restored_paths)


def _seed_infospace(workspace: Path, slug: str = "demo") -> Path:
    create_infospace(workspace, slug, name="Demo", topic_domain="Test")
    root = workspace / "infospaces" / slug
    source = workspace / "source.md"
    source.write_text("# source\n", encoding="utf-8")
    add_artifact(root, source, kind="source", title="Source One")
    (root / "reports" / "summary.md").write_text("# summary\n", encoding="utf-8")
    return root


def test_archive_infospace_writes_index_and_finalizes_package(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)

    record = archive_infospace(root, note="first archive")

    assert isinstance(record, ArchiveRecord)
    assert record.package_id
    assert record.manifest_digest.startswith("blake3:")
    assert record.retention_class == DEFAULT_RETENTION_CLASS
    assert record.producer == PRODUCER
    assert record.subject == "demo"
    assert record.note == "first archive"
    assert record.file_count >= 4  # infospace.yaml, index.yaml, source.md, summary.md

    index_path = root / ARCHIVE_INDEX_PATH
    assert index_path.is_file()
    data = yaml.safe_load(index_path.read_text(encoding="utf-8"))
    assert isinstance(data, dict)
    assert len(data["archives"]) == 1
    assert data["archives"][0]["package_id"] == record.package_id

    store_root = root / ARCHIVE_STORE_DIR
    assert (store_root / "registry.sqlite").is_file()
    assert (store_root / "storage").is_dir()


def test_list_archives_returns_recorded_entries(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)

    assert list_archives(root) == []
    first = archive_infospace(root, note="alpha")
    second = archive_infospace(root, note="beta")

    archives = list_archives(root)
    assert [a.package_id for a in archives] == [first.package_id, second.package_id]
    assert [a.note for a in archives] == ["alpha", "beta"]


def test_archive_excludes_store_dir_to_avoid_recursive_capture(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)

    first = archive_infospace(root)
    second = archive_infospace(root)

    # The store dir grows on the first call; the second call must not pick up
    # any of its bytes (otherwise file_count would balloon).
    assert second.file_count == first.file_count
    second_record = list_archives(root)[1]
    assert all(
        not path.startswith(ARCHIVE_STORE_DIR)
        for path in second_record.included_paths
    )


def test_archive_respects_caller_supplied_include_set(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)

    record = archive_infospace(root, include=["infospace.yaml"])
    assert record.included_paths == ["infospace.yaml"]
    assert record.file_count == 1


def test_archive_rejects_empty_include(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)

    with pytest.raises(InfospaceError) as excinfo:
        archive_infospace(root, include=["does-not-exist"])
    assert excinfo.value.code == "empty_archive"


def test_restore_archive_round_trips_bytes(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)
    record = archive_infospace(root, note="round trip")

    target = tmp_path / "restored"
    result = restore_archive(
        record.package_id,
        target=target,
        source_infospace=root,
    )

    assert isinstance(result, RestoredArchive)
    assert result.manifest_digest == record.manifest_digest
    assert result.file_count == record.file_count

    for rel in result.restored_paths:
        original = root / rel
        restored = target / rel
        assert restored.is_file()
        assert filecmp.cmp(original, restored, shallow=False), rel


def test_restore_archive_refuses_non_empty_target(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)
    record = archive_infospace(root)

    target = tmp_path / "filled"
    target.mkdir()
    (target / "existing.txt").write_text("hi", encoding="utf-8")

    with pytest.raises(InfospaceError) as excinfo:
        restore_archive(
            record.package_id,
            target=target,
            source_infospace=root,
        )
    assert excinfo.value.code == "restore_target_not_empty"


def test_restore_archive_force_overwrites_non_empty_target(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)
    record = archive_infospace(root)

    target = tmp_path / "filled-force"
    target.mkdir()
    (target / "leftover.txt").write_text("old", encoding="utf-8")

    result = restore_archive(
        record.package_id,
        target=target,
        source_infospace=root,
        force=True,
    )
    assert result.file_count == record.file_count
    # Pre-existing files that are not in the manifest are left in place.
    assert (target / "leftover.txt").read_text(encoding="utf-8") == "old"


def test_restore_archive_requires_store_location(tmp_path: Path) -> None:
    with pytest.raises(InfospaceError) as excinfo:
        restore_archive("00000000-0000-0000-0000-000000000000", target=tmp_path)
    assert excinfo.value.code == "missing_archive_store"


def test_annotate_retention_returns_state_for_each_archive(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)
    first = archive_infospace(root)
    second = archive_infospace(root)

    archives = list_archives(root)
    annotated = annotate_retention(archives, source_infospace=root)

    assert [item["archive"]["package_id"] for item in annotated] == [
        first.package_id,
        second.package_id,
    ]
    for item in annotated:
        retention = item["retention"]
        assert retention is not None
        assert retention["effective_class"] == DEFAULT_RETENTION_CLASS
        assert retention["eligible_for_deletion"] is False


def test_archive_default_include_captures_contracts_and_schemas(
    tmp_path: Path,
) -> None:
    root = _seed_infospace(tmp_path)
    (root / "contracts").mkdir()
    (root / "contracts" / "entity.contract.md").write_text(
        "# contract\n", encoding="utf-8"
    )
    (root / "schemas").mkdir()
    (root / "schemas" / "entity.schema.json").write_text("{}", encoding="utf-8")

    record = archive_infospace(root)
    assert "contracts/entity.contract.md" in [
        rel for rel in _restored_paths_via_round_trip(record, root, tmp_path)
    ]


def test_archive_surfaces_skipped_top_level_dirs(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)
    (root / "experimental").mkdir()
    (root / "experimental" / "scratch.md").write_text("scratch", encoding="utf-8")
    (root / "empty-dir").mkdir()  # empty: not flagged

    record = archive_infospace(root)
    assert record.skipped_top_level == ["experimental"]


def test_annotate_retention_returns_none_when_store_missing(tmp_path: Path) -> None:
    root = _seed_infospace(tmp_path)
    archive_infospace(root, store_root=tmp_path / "external-store")

    archives = list_archives(root)
    # Source infospace's store doesn't exist (we overrode store_root)
    annotated = annotate_retention(archives, source_infospace=root)
    assert annotated[0]["retention"] is None