"""Phase 0 — muse label command tests (LB_01–LB_08).

Covers the ``muse label`` CLI after the rename from old ``muse tag`` label
annotations.  All label operations live here; version tags live in
``test_cmd_version_tags.py``.
"""

from __future__ import annotations

import datetime
import json
import pathlib

import pytest
from tests.cli_test_helper import CliRunner
from muse.core.types import fake_id
from muse.core.paths import muse_dir, ref_path

cli = None
runner = CliRunner()


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _env(root: pathlib.Path) -> dict:
    return {"MUSE_REPO_ROOT": str(root)}


def _init_repo(tmp_path: pathlib.Path) -> tuple[pathlib.Path, str]:
    dot_muse = muse_dir(tmp_path)
    dot_muse.mkdir()
    repo_id = fake_id("repo")
    (dot_muse / "repo.json").write_text(json.dumps({
        "repo_id": repo_id,
        "domain": "midi",
        "default_branch": "main",
        "created_at": "2025-01-01T00:00:00+00:00",
    }), encoding="utf-8")
    (dot_muse / "HEAD").write_text("ref: refs/heads/main", encoding="utf-8")
    (dot_muse / "refs" / "heads").mkdir(parents=True)
    (dot_muse / "snapshots").mkdir()
    (dot_muse / "commits").mkdir()
    (dot_muse / "objects").mkdir()
    return tmp_path, repo_id


def _make_commit(
    root: pathlib.Path, repo_id: str, branch: str = "main", message: str = "test"
) -> str:
    from muse.core.commits import CommitRecord, write_commit
    from muse.core.snapshots import SnapshotRecord, write_snapshot
    from muse.core.ids import hash_snapshot, hash_commit

    ref_file = ref_path(root, branch)
    parent_id = ref_file.read_text().strip() if ref_file.exists() else None
    manifest: dict = {}
    snap_id = hash_snapshot(manifest)
    committed_at = datetime.datetime.now(datetime.timezone.utc)
    commit_id = hash_commit(
        parent_ids=[parent_id] if parent_id else [],
        snapshot_id=snap_id,
        message=message,
        committed_at_iso=committed_at.isoformat(),
    )
    write_snapshot(root, SnapshotRecord(snapshot_id=snap_id, manifest=manifest))
    write_commit(root, CommitRecord(
        commit_id=commit_id, branch=branch,
        snapshot_id=snap_id, message=message, committed_at=committed_at,
        parent_commit_id=parent_id,
    ))
    ref_file.parent.mkdir(parents=True, exist_ok=True)
    ref_file.write_text(commit_id, encoding="utf-8")
    return commit_id


# ---------------------------------------------------------------------------
# LB_01 — label add returns label_id (not tag_id)
# ---------------------------------------------------------------------------

class TestLB01LabelAddReturnsLabelId:
    """LB_01: ``muse label add`` JSON output uses ``label_id``, not ``tag_id``."""

    def test_add_json_has_label_id(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "add", "emotion:joyful", "--json"], env=_env(root))
        assert result.exit_code == 0, result.output
        data = json.loads(result.output)
        assert "label_id" in data
        assert "tag_id" not in data

    def test_add_json_label_id_is_sha256(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "add", "section:chorus", "--json"], env=_env(root))
        data = json.loads(result.output)
        assert data["label_id"].startswith("sha256:")
        assert len(data["label_id"]) == 71

    def test_add_json_label_field_present(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "add", "tempo:120bpm", "--json"], env=_env(root))
        data = json.loads(result.output)
        assert "label" in data
        assert data["label"] == "tempo:120bpm"
        assert "tag" not in data


# ---------------------------------------------------------------------------
# LB_02 — label list returns labels key (not tags)
# ---------------------------------------------------------------------------

class TestLB02LabelListReturnsLabelsKey:
    """LB_02: ``muse label list`` JSON output uses ``labels`` key, not ``tags``."""

    def test_list_json_has_labels_key(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "emotion:happy"], env=_env(root))
        result = runner.invoke(cli, ["label", "list", "--json"], env=_env(root))
        assert result.exit_code == 0, result.output
        data = json.loads(result.output)
        assert "labels" in data
        assert "tags" not in data

    def test_list_json_no_tags_key_when_empty(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "list", "--json"], env=_env(root))
        data = json.loads(result.output)
        assert "labels" in data
        assert "tags" not in data
        assert data["labels"] == []

    def test_list_entry_has_label_field(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "stage:master"], env=_env(root))
        result = runner.invoke(cli, ["label", "list", "--json"], env=_env(root))
        data = json.loads(result.output)
        entry = data["labels"][0]
        assert "label" in entry
        assert "tag" not in entry
        assert "label_id" in entry
        assert "tag_id" not in entry


# ---------------------------------------------------------------------------
# LB_03 — add status is "labelled" / "already_labelled"
# ---------------------------------------------------------------------------

class TestLB03StatusStrings:
    """LB_03: status strings use label-specific values."""

    def test_first_add_status_is_labelled(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "add", "emotion:tense", "--json"], env=_env(root))
        data = json.loads(result.output)
        assert data["status"] == "labelled"
        assert data["status"] != "tagged"

    def test_duplicate_add_status_is_already_labelled(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "emotion:tense"], env=_env(root))
        result = runner.invoke(cli, ["label", "add", "emotion:tense", "--json"], env=_env(root))
        data = json.loads(result.output)
        assert data["status"] == "already_labelled"
        assert data["status"] != "already_tagged"


# ---------------------------------------------------------------------------
# LB_04 — remove returns label_ids (not tag_ids)
# ---------------------------------------------------------------------------

class TestLB04RemoveReturnsLabelIds:
    """LB_04: ``muse label remove`` JSON output uses ``label_ids``, not ``tag_ids``."""

    def test_remove_json_has_label_ids(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "emotion:joyful"], env=_env(root))
        result = runner.invoke(cli, ["label", "remove", "emotion:joyful", "--json"], env=_env(root))
        assert result.exit_code == 0, result.output
        data = json.loads(result.output)
        assert "label_ids" in data
        assert "tag_ids" not in data

    def test_remove_json_label_field(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "section:verse"], env=_env(root))
        result = runner.invoke(cli, ["label", "remove", "section:verse", "--json"], env=_env(root))
        data = json.loads(result.output)
        assert "label" in data
        assert data["label"] == "section:verse"
        assert "tag" not in data

    def test_remove_not_found_has_label_ids(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "remove", "ghost:label", "--json"], env=_env(root))
        data = json.loads(result.output)
        assert "label_ids" in data
        assert data["label_ids"] == []
        assert "tag_ids" not in data


# ---------------------------------------------------------------------------
# LB_05 — muse label is a registered command (not just muse tag)
# ---------------------------------------------------------------------------

class TestLB05LabelCommandRegistered:
    """LB_05: ``muse label`` is registered as a top-level command."""

    def test_label_add_exits_zero(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "add", "key:Am"], env=_env(root))
        assert result.exit_code == 0

    def test_label_list_exits_zero(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["label", "list"], env=_env(root))
        assert result.exit_code == 0

    def test_label_remove_exits_zero(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "key:Am"], env=_env(root))
        result = runner.invoke(cli, ["label", "remove", "key:Am"], env=_env(root))
        assert result.exit_code == 0


# ---------------------------------------------------------------------------
# LB_06 — muse tag no longer handles label annotations
# ---------------------------------------------------------------------------

class TestLB06TagNoLongerHandlesLabels:
    """LB_06: ``muse tag`` subcommands are add/list/read/delete/latest (version tags only)."""

    def test_tag_add_requires_version_format(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["tag", "add", "v1.0.0"], env=_env(root))
        assert result.exit_code == 0

    def test_tag_add_emotion_label_rejected(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["tag", "add", "emotion:joyful"], env=_env(root))
        assert result.exit_code != 0

    def test_tag_list_returns_tags_key(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        result = runner.invoke(cli, ["tag", "list", "--json"], env=_env(root))
        assert result.exit_code == 0
        data = json.loads(result.output)
        assert "tags" in data
        assert "labels" not in data


# ---------------------------------------------------------------------------
# LB_07 — label and tag coexist without interference
# ---------------------------------------------------------------------------

class TestLB07LabelAndTagCoexist:
    """LB_07: ``muse label`` and ``muse tag`` store data in separate directories."""

    def test_label_storage_separate_from_version_tags(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "emotion:happy"], env=_env(root))
        runner.invoke(cli, ["tag", "add", "v1.0.0"], env=_env(root))

        label_result = runner.invoke(cli, ["label", "list", "--json"], env=_env(root))
        tag_result = runner.invoke(cli, ["tag", "list", "--json"], env=_env(root))

        labels = json.loads(label_result.output)
        tags = json.loads(tag_result.output)

        assert labels["total"] == 1
        assert tags["total"] == 1

        assert labels["labels"][0]["label"] == "emotion:happy"
        assert tags["tags"][0]["tag"] == "v1.0.0"

    def test_label_dir_is_dot_muse_tags(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["label", "add", "section:chorus"], env=_env(root))
        tags_dir = root / ".muse" / "tags"
        assert tags_dir.exists()

    def test_version_tag_dir_is_dot_muse_version_tags(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))
        runner.invoke(cli, ["tag", "add", "v2.0.0"], env=_env(root))
        version_tags_dir = root / ".muse" / "version-tags"
        assert version_tags_dir.exists()


# ---------------------------------------------------------------------------
# LB_08 — label round-trip (add → list → remove)
# ---------------------------------------------------------------------------

class TestLB08LabelRoundTrip:
    """LB_08: full round-trip for label annotations."""

    def test_round_trip(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))

        add_result = runner.invoke(cli, ["label", "add", "emotion:joyful", "--json"], env=_env(root))
        assert add_result.exit_code == 0
        add_data = json.loads(add_result.output)
        assert add_data["status"] == "labelled"
        assert add_data["label_id"].startswith("sha256:")

        list_result = runner.invoke(cli, ["label", "list", "--json"], env=_env(root))
        list_data = json.loads(list_result.output)
        assert list_data["total"] == 1
        assert list_data["labels"][0]["label"] == "emotion:joyful"
        assert list_data["labels"][0]["label_id"] == add_data["label_id"]

        remove_result = runner.invoke(cli, ["label", "remove", "emotion:joyful", "--json"], env=_env(root))
        remove_data = json.loads(remove_result.output)
        assert remove_data["status"] == "removed"
        assert remove_data["removed_count"] == 1
        assert add_data["label_id"] in remove_data["label_ids"]

        list_after = runner.invoke(cli, ["label", "list", "--json"], env=_env(root))
        assert json.loads(list_after.output)["total"] == 0

    def test_multiple_labels_round_trip(self, tmp_path: pathlib.Path) -> None:
        root, _ = _init_repo(tmp_path)
        _make_commit(root, fake_id("repo"))

        for label in ["emotion:joyful", "section:chorus", "key:Am", "tempo:120bpm"]:
            result = runner.invoke(cli, ["label", "add", label, "--json"], env=_env(root))
            assert json.loads(result.output)["status"] == "labelled"

        list_result = runner.invoke(cli, ["label", "list", "--json"], env=_env(root))
        data = json.loads(list_result.output)
        assert data["total"] == 4
        label_names = {e["label"] for e in data["labels"]}
        assert label_names == {"emotion:joyful", "section:chorus", "key:Am", "tempo:120bpm"}