# backend/tests/test_rls_isolation.py
"""
RLS foundation tests.

Connect directly as resolutionflow_app (not superuser) and verify:
  - Tenant A cannot read Tenant B's rows
  - No tenant context set → zero rows for private data (fail-closed)
  - Platform rows (PLATFORM_ACCOUNT_ID) are visible to all tenants

Tests bypass FastAPI entirely — raw asyncpg connections only.
MUST FAIL before Task 10 (RLS migration) and PASS after it.

Run with:
    DB_APP_ROLE_PASSWORD=app_secret_change_me pytest tests/test_rls_isolation.py -v

The test DB is patherly_test (matches conftest.py default).
"""
import os
import uuid

import asyncpg
import pytest

_DB_HOST = os.getenv("TEST_DB_HOST", "localhost")
_DB_PORT = int(os.getenv("TEST_DB_PORT", "5432"))
_DB_NAME = os.getenv("TEST_DB_NAME", "patherly_test")      # matches conftest.py
_APP_PASSWORD = os.getenv("DB_APP_ROLE_PASSWORD", "app_secret_change_me")
_ADMIN_DSN = f"postgresql://postgres:postgres@{_DB_HOST}:{_DB_PORT}/{_DB_NAME}"

PLATFORM_ACCOUNT_ID = "00000000-0000-0000-0000-000000000001"
ACCOUNT_A_ID = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
ACCOUNT_B_ID = "bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------

@pytest.fixture(scope="module")
async def admin_conn():
    """Superuser asyncpg connection for fixture setup and teardown."""
    conn = await asyncpg.connect(_ADMIN_DSN)
    yield conn
    await conn.close()


@pytest.fixture(scope="module", autouse=True)
async def seed_rls_test_data(admin_conn):
    """
    Create two isolated test accounts, one user per account, and one private
    tree per account. Trees require a valid author_id FK to users, so users
    must be created first.

    accounts.display_code must be unique and 8 chars (NOT NULL constraint).
    """
    # Insert accounts
    await admin_conn.execute(f"""
        INSERT INTO accounts (id, name, display_code, created_at, updated_at)
        VALUES
            ('{ACCOUNT_A_ID}', 'RLS Tenant A', 'RLSA0001', NOW(), NOW()),
            ('{ACCOUNT_B_ID}', 'RLS Tenant B', 'RLSB0001', NOW(), NOW())
        ON CONFLICT (id) DO NOTHING
    """)

    # Insert one user per account (users.account_id NOT NULL, password_hash NOT NULL)
    user_a_id = str(uuid.uuid4())
    user_b_id = str(uuid.uuid4())
    await admin_conn.execute(f"""
        INSERT INTO users (
            id, email, password_hash, name, role, is_active, account_id,
            account_role, created_at
        ) VALUES
            ('{user_a_id}', 'rls-user-a@example.com',
             'placeholder', 'RLS User A', 'engineer', TRUE,
             '{ACCOUNT_A_ID}', 'engineer', NOW()),
            ('{user_b_id}', 'rls-user-b@example.com',
             'placeholder', 'RLS User B', 'engineer', TRUE,
             '{ACCOUNT_B_ID}', 'engineer', NOW())
        ON CONFLICT (email) DO NOTHING
    """)

    # Look up the user IDs we just inserted (ON CONFLICT may have skipped)
    row_a = await admin_conn.fetchrow(
        "SELECT id FROM users WHERE email = 'rls-user-a@example.com'"
    )
    row_b = await admin_conn.fetchrow(
        "SELECT id FROM users WHERE email = 'rls-user-b@example.com'"
    )
    actual_user_a = str(row_a["id"])
    actual_user_b = str(row_b["id"])

    # Insert one private tree per account with explicit author_id
    await admin_conn.execute(f"""
        INSERT INTO trees (
            id, name, account_id, author_id, is_active, is_default,
            is_public, visibility, tree_type, created_at, updated_at
        ) VALUES
            (gen_random_uuid(), 'RLS Tree A', '{ACCOUNT_A_ID}', '{actual_user_a}',
             TRUE, FALSE, FALSE, 'private', 'troubleshooting', NOW(), NOW()),
            (gen_random_uuid(), 'RLS Tree B', '{ACCOUNT_B_ID}', '{actual_user_b}',
             TRUE, FALSE, FALSE, 'private', 'troubleshooting', NOW(), NOW())
    """)

    # One platform-owned tree_tag (global, visible to all tenants)
    await admin_conn.execute(f"""
        INSERT INTO tree_tags (
            id, name, slug, account_id, usage_count, created_at, updated_at
        ) VALUES (
            gen_random_uuid(), 'rls-global-tag', 'rls-global-tag',
            '{PLATFORM_ACCOUNT_ID}', 0, NOW(), NOW()
        ) ON CONFLICT DO NOTHING
    """)

    yield

    # Cleanup
    await admin_conn.execute(
        f"DELETE FROM trees WHERE account_id IN ('{ACCOUNT_A_ID}', '{ACCOUNT_B_ID}')"
    )
    await admin_conn.execute(
        "DELETE FROM users WHERE email IN "
        "('rls-user-a@example.com', 'rls-user-b@example.com')"
    )
    await admin_conn.execute(
        f"DELETE FROM accounts WHERE id IN ('{ACCOUNT_A_ID}', '{ACCOUNT_B_ID}')"
    )
    await admin_conn.execute("DELETE FROM tree_tags WHERE slug = 'rls-global-tag'")


@pytest.fixture
async def conn_a():
    """App-role connection, tenant context = Account A."""
    conn = await asyncpg.connect(
        host=_DB_HOST, port=_DB_PORT, database=_DB_NAME,
        user="resolutionflow_app", password=_APP_PASSWORD,
    )
    await conn.execute(
        "SELECT set_config('app.current_account_id', $1, true)", ACCOUNT_A_ID
    )
    yield conn
    await conn.close()


@pytest.fixture
async def conn_b():
    """App-role connection, tenant context = Account B."""
    conn = await asyncpg.connect(
        host=_DB_HOST, port=_DB_PORT, database=_DB_NAME,
        user="resolutionflow_app", password=_APP_PASSWORD,
    )
    await conn.execute(
        "SELECT set_config('app.current_account_id', $1, true)", ACCOUNT_B_ID
    )
    yield conn
    await conn.close()


@pytest.fixture
async def conn_no_context():
    """App-role connection with NO tenant context set."""
    conn = await asyncpg.connect(
        host=_DB_HOST, port=_DB_PORT, database=_DB_NAME,
        user="resolutionflow_app", password=_APP_PASSWORD,
    )
    yield conn
    await conn.close()


# ---------------------------------------------------------------------------
# trees
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_trees_account_a_cannot_see_account_b_rows(conn_a):
    rows = await conn_a.fetch(
        f"SELECT id FROM trees WHERE account_id = '{ACCOUNT_B_ID}'"
    )
    assert len(rows) == 0, "Account A should not see Account B trees"


@pytest.mark.asyncio
async def test_trees_account_a_can_see_own_rows(conn_a):
    rows = await conn_a.fetch(
        f"SELECT id FROM trees WHERE account_id = '{ACCOUNT_A_ID}'"
    )
    assert len(rows) >= 1, "Account A should see its own trees"


@pytest.mark.asyncio
async def test_trees_no_context_sees_no_private_trees(conn_no_context):
    rows = await conn_no_context.fetch(
        "SELECT id FROM trees WHERE is_default = FALSE AND is_public = FALSE"
    )
    assert len(rows) == 0, "No-context connection should see no private trees"


# ---------------------------------------------------------------------------
# tree_tags — platform visibility
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_tree_tags_account_a_cannot_see_account_b_tags(conn_a):
    rows = await conn_a.fetch(
        f"SELECT id FROM tree_tags WHERE account_id = '{ACCOUNT_B_ID}'"
    )
    assert len(rows) == 0


@pytest.mark.asyncio
async def test_tree_tags_both_tenants_see_platform_tags(conn_a, conn_b):
    rows_a = await conn_a.fetch(
        f"SELECT id FROM tree_tags WHERE account_id = '{PLATFORM_ACCOUNT_ID}'"
    )
    rows_b = await conn_b.fetch(
        f"SELECT id FROM tree_tags WHERE account_id = '{PLATFORM_ACCOUNT_ID}'"
    )
    assert len(rows_a) >= 1, "Account A should see platform tags"
    assert len(rows_b) >= 1, "Account B should see platform tags"


# ---------------------------------------------------------------------------
# tree_categories — platform visibility
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_tree_categories_account_a_cannot_see_account_b(conn_a):
    rows = await conn_a.fetch(
        f"SELECT id FROM tree_categories WHERE account_id = '{ACCOUNT_B_ID}'"
    )
    assert len(rows) == 0


# ---------------------------------------------------------------------------
# step_categories — platform visibility
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_step_categories_account_a_cannot_see_account_b(conn_a):
    rows = await conn_a.fetch(
        f"SELECT id FROM step_categories WHERE account_id = '{ACCOUNT_B_ID}'"
    )
    assert len(rows) == 0


# ---------------------------------------------------------------------------
# psa_connections — tenant-only
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_psa_connections_account_a_cannot_see_account_b(conn_a):
    rows = await conn_a.fetch(
        f"SELECT id FROM psa_connections WHERE account_id = '{ACCOUNT_B_ID}'"
    )
    assert len(rows) == 0


# ---------------------------------------------------------------------------
# flow_proposals — tenant-only
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_flow_proposals_account_a_cannot_see_account_b(conn_a):
    rows = await conn_a.fetch(
        f"SELECT id FROM flow_proposals WHERE account_id = '{ACCOUNT_B_ID}'"
    )
    assert len(rows) == 0