"""TDD — init commit ID must be sha256:... not init-sha256:... (issue #60).

IC-1  create_repo(initialize=True) produces a commit_id starting with 'sha256:'.
IC-2  The init commit_id exists as a real row in musehub_commits.
IC-3  wire_refs for a freshly initialized repo returns a branch head starting with 'sha256:'.
IC-4  ensure_hub_seed must detect a never-pushed seed as stale (structural check).
"""
from __future__ import annotations

import pytest
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from musehub.db import musehub_repo_models as db
from musehub.core.genesis import compute_identity_id


def _owner_user_id(handle: str) -> str:
    return compute_identity_id(handle.encode())


# ── IC-1 ──────────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_ic1_init_commit_id_is_sha256(db_session: AsyncSession) -> None:
    """create_repo(initialize=True) must produce a sha256:... commit_id, not init-sha256:..."""
    from musehub.services.musehub_repository import create_repo

    repo = await create_repo(
        db_session,
        name="ic-test-1",
        owner="gabriel",
        owner_user_id=_owner_user_id("gabriel"),
        visibility="public",
        initialize=True,
    )

    branch_q = await db_session.execute(
        select(db.MusehubBranch).where(db.MusehubBranch.repo_id == repo.repo_id)
    )
    branch = branch_q.scalar_one_or_none()
    assert branch is not None, "branch not created"
    cid = branch.head_commit_id
    assert cid is not None, "head_commit_id is None"
    assert cid.startswith("sha256:"), f"got {cid!r} — must be sha256:..."
    assert not cid.startswith("init-"), f"got {cid!r} — init- prefix is not an algorithm"


# ── IC-2 ──────────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_ic2_init_commit_exists_in_musehub_commits(db_session: AsyncSession) -> None:
    """The init commit_id must exist as a real row in musehub_commits."""
    from musehub.services.musehub_repository import create_repo

    repo = await create_repo(
        db_session,
        name="ic-test-2",
        owner="gabriel",
        owner_user_id=_owner_user_id("gabriel"),
        visibility="public",
        initialize=True,
    )

    branch_q = await db_session.execute(
        select(db.MusehubBranch).where(db.MusehubBranch.repo_id == repo.repo_id)
    )
    branch = branch_q.scalar_one()
    row = await db_session.get(db.MusehubCommit, branch.head_commit_id)
    assert row is not None, (
        f"init commit {branch.head_commit_id!r} not found in musehub_commits"
    )


# ── IC-3 ──────────────────────────────────────────────────────────────────────

@pytest.mark.asyncio
async def test_ic3_wire_refs_head_is_valid_sha256(db_session: AsyncSession) -> None:
    """wire_refs for a freshly initialized repo returns a sha256:... branch head."""
    from musehub.services.musehub_repository import create_repo
    from musehub.services.musehub_wire import wire_refs

    repo = await create_repo(
        db_session,
        name="ic-test-3",
        owner="gabriel",
        owner_user_id=_owner_user_id("gabriel"),
        visibility="public",
        initialize=True,
    )

    result = await wire_refs(db_session, repo.repo_id)
    assert result is not None
    for branch_name, head in result.branch_heads.items():
        assert head.startswith("sha256:"), (
            f"branch {branch_name!r} head {head!r} is not a valid sha256: commit ID"
        )
        assert not head.startswith("init-"), (
            f"branch {branch_name!r} head {head!r} still uses the invalid init- prefix"
        )


# ── IC-4 ──────────────────────────────────────────────────────────────────────

def test_ic4_ensure_hub_seed_checks_branch_head() -> None:
    """ensure_hub_seed must reject a seed whose branch head is the init placeholder.

    A repo created via wizard but never pushed to has head = sha256:<init-hash>.
    The bench must detect this and force a re-push, not silently reuse the empty repo.
    """
    import inspect
    import sys
    sys.path.insert(0, "/Users/gabriel/ecosystem/musehub/tests")
    import bench_cli

    src = inspect.getsource(bench_cli.ensure_hub_seed)
    assert "branch_heads" in src or "head_commit" in src, (
        "ensure_hub_seed must verify branch heads are real pushed commits — "
        "not just check repo existence and wire_hash"
    )