"""Phase 0 tenant-isolation tests.

Verifies that endpoints respect account boundaries and don't leak data
across tenants. Each task group tests a specific endpoint fix.
"""
import uuid
import datetime as dt
import pytest
from httpx import AsyncClient
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.account import Account
from app.models.user import User
from app.models.tree import Tree
from app.models.subscription import Subscription
from app.core.security import get_password_hash


# ── Helpers ──────────────────────────────────────────────────────────────────

async def _create_account_and_user(db: AsyncSession, prefix: str):
    """Create a fresh account + engineer user. Returns (account, user, plain_password).

    Seeds a default active Pro Subscription for the account so requests pass
    the require_active_subscription guard added in Phase 1 Task 11.
    """
    password = "TestPass123!"
    account = Account(
        name=f"{prefix}-corp",
        display_code=uuid.uuid4().hex[:8],
    )
    db.add(account)
    await db.flush()

    user = User(
        email=f"{prefix}-{uuid.uuid4().hex[:6]}@example.com",
        name=f"{prefix} user",
        password_hash=get_password_hash(password),
        is_active=True,
        account_id=account.id,
        account_role="engineer",
    )
    db.add(user)
    db.add(Subscription(account_id=account.id, plan="pro", status="active"))
    await db.flush()
    return account, user, password


async def _login(client: AsyncClient, email: str, password: str) -> dict:
    """Log in and return Authorization headers."""
    resp = await client.post(
        "/api/v1/auth/login/json",
        json={"email": email, "password": password},
    )
    assert resp.status_code == 200, f"Login failed: {resp.text}"
    token = resp.json()["access_token"]
    return {"Authorization": f"Bearer {token}"}


async def _create_private_tree(db: AsyncSession, account: Account, user: User) -> Tree:
    """Create a private tree owned by the given account/user."""
    tree = Tree(
        name=f"Private Tree {uuid.uuid4().hex[:6]}",
        account_id=account.id,
        author_id=user.id,
        visibility="private",
        tree_type="troubleshooting",
        tree_structure={"id": "root", "type": "start", "children": []},
        is_active=True,
        status="published",
    )
    db.add(tree)
    await db.flush()
    return tree


# ── Task 3: Analytics flow endpoint ──────────────────────────────────────────

@pytest.mark.asyncio
async def test_analytics_flow_cannot_read_other_account_tree(
    client: AsyncClient, test_db: AsyncSession
):
    """Account A cannot read flow analytics for Account B's private tree."""
    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "anl-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "anl-b")
    tree_b = await _create_private_tree(test_db, acct_b, user_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)

    resp = await client.get(
        f"/api/v1/analytics/flows/{tree_b.id}",
        headers=headers_a,
    )
    assert resp.status_code == 404, f"Expected 404, got {resp.status_code}: {resp.text}"


# ── Task 4: Category tree count ───────────────────────────────────────────────

@pytest.mark.asyncio
async def test_category_tree_count_scoped_to_account(
    client: AsyncClient, test_db: AsyncSession
):
    """tree_count on a category must not include trees from other accounts."""
    from app.models.category import TreeCategory

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "cat-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "cat-b")

    # Categories are tenant-scoped; the endpoint must only count account A's trees.
    category = TreeCategory(
        name="Shared Category",
        slug=f"shared-cat-{uuid.uuid4().hex[:6]}",
        account_id=acct_a.id,
        is_active=True,
    )
    test_db.add(category)
    await test_db.flush()

    # 3 trees for account_b under this category
    for i in range(3):
        tree = Tree(
            name=f"B Tree {i}",
            account_id=acct_b.id,
            author_id=user_b.id,
            category_id=category.id,
            visibility="team",
            tree_type="troubleshooting",
            tree_structure={"id": "root", "type": "start", "children": []},
            is_active=True,
            status="published",
        )
        test_db.add(tree)

    # 1 tree for account_a under this category
    tree_a = Tree(
        name="A Tree",
        account_id=acct_a.id,
        author_id=user_a.id,
        category_id=category.id,
        visibility="team",
        tree_type="troubleshooting",
        tree_structure={"id": "root", "type": "start", "children": []},
        is_active=True,
        status="published",
    )
    test_db.add(tree_a)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)

    resp = await client.get(
        f"/api/v1/categories/{category.id}",
        headers=headers_a,
    )
    assert resp.status_code == 200, resp.text
    # account_a should only see their 1 tree, not account_b's 3
    assert resp.json()["tree_count"] == 1, (
        f"Expected tree_count=1 (own trees only), got {resp.json()['tree_count']}"
    )


# ── Task 5: AI session search scope ──────────────────────────────────────────

@pytest.mark.asyncio
async def test_ai_session_search_cannot_see_other_users_sessions(
    client: AsyncClient, test_db: AsyncSession
):
    """User A cannot find User B's AI sessions via the search endpoint,
    even when both users are in the same account."""
    from app.models.ai_session import AISession

    # Two users in the SAME account
    account = Account(name="Shared Corp", display_code=uuid.uuid4().hex[:8])
    test_db.add(account)
    await test_db.flush()
    test_db.add(Subscription(account_id=account.id, plan="pro", status="active"))

    password = "TestPass123!"
    user_a = User(
        email=f"user-a-{uuid.uuid4().hex[:6]}@shared.com",
        name="User A",
        password_hash=get_password_hash(password),
        is_active=True,
        account_id=account.id,
        account_role="engineer",
    )
    user_b = User(
        email=f"user-b-{uuid.uuid4().hex[:6]}@shared.com",
        name="User B",
        password_hash=get_password_hash(password),
        is_active=True,
        account_id=account.id,
        account_role="engineer",
    )
    test_db.add_all([user_a, user_b])
    await test_db.flush()

    # Session belonging to user_b with distinctive problem_summary
    session_b = AISession(
        user_id=user_b.id,
        account_id=account.id,
        problem_summary="CONFIDENTIAL: user_b's session",
        problem_domain="networking",
        status="resolved",
    )
    test_db.add(session_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, password)

    resp = await client.get(
        "/api/v1/ai-sessions/search",
        params={"q": "CONFIDENTIAL"},
        headers=headers_a,
    )
    assert resp.status_code == 200, resp.text
    results = resp.json()
    ids = [r["id"] for r in results]
    assert str(session_b.id) not in ids, (
        "User A can see User B's session via search — cross-user leak within account"
    )


# ── Task 6: Cross-tenant UUID audit ─────────────────────────────────────────


@pytest.mark.asyncio
async def test_get_tree_returns_404_not_403_for_other_account(
    client: AsyncClient, test_db: AsyncSession
):
    """Account A gets 404 (not 403) when accessing Account B's private tree."""
    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-tree-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-tree-b")
    tree_b = await _create_private_tree(test_db, acct_b, user_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/trees/{tree_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-tenant tree access, got {resp.status_code}"
    )


@pytest.mark.asyncio
async def test_update_tree_returns_404_not_403_for_other_account(
    client: AsyncClient, test_db: AsyncSession
):
    """Account A gets 404 (not 403) when trying to update Account B's tree."""
    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-upd-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-upd-b")
    tree_b = await _create_private_tree(test_db, acct_b, user_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.put(
        f"/api/v1/trees/{tree_b.id}",
        json={"name": "Hacked"},
        headers=headers_a,
    )
    assert resp.status_code == 404, (
        f"Expected 404 for cross-tenant tree update, got {resp.status_code}"
    )


@pytest.mark.asyncio
async def test_get_session_returns_404_not_403_for_other_user(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 (not 403) when accessing User B's session."""
    from app.models.session import Session

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-sess-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-sess-b")
    tree_b = await _create_private_tree(test_db, acct_b, user_b)

    session_b = Session(
        tree_id=tree_b.id,
        user_id=user_b.id,
        account_id=acct_b.id,
        tree_snapshot={"id": "root", "type": "start", "children": []},
        path_taken=[],
        decisions=[],
    )
    test_db.add(session_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/sessions/{session_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-user session access, got {resp.status_code}"
    )


@pytest.mark.asyncio
async def test_ai_session_get_returns_404_not_403_for_other_user(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 (not 403) when accessing User B's AI session."""
    from app.models.ai_session import AISession

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-ais-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-ais-b")

    ai_session_b = AISession(
        user_id=user_b.id,
        account_id=acct_b.id,
        problem_summary="Test session",
        problem_domain="networking",
        status="active",
    )
    test_db.add(ai_session_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/ai-sessions/{ai_session_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-user AI session access, got {resp.status_code}"
    )


@pytest.mark.asyncio
async def test_ai_session_retry_psa_push_requires_ownership(
    client: AsyncClient, test_db: AsyncSession
):
    """User A cannot retry PSA push for User B's AI session."""
    from app.models.ai_session import AISession

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-psa-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-psa-b")

    ai_session_b = AISession(
        user_id=user_b.id,
        account_id=acct_b.id,
        problem_summary="PSA test",
        problem_domain="networking",
        status="resolved",
    )
    test_db.add(ai_session_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.post(
        f"/api/v1/ai-sessions/{ai_session_b.id}/retry-psa-push",
        headers=headers_a,
    )
    assert resp.status_code == 404, (
        f"Expected 404 for cross-user retry-psa-push, got {resp.status_code}"
    )


@pytest.mark.asyncio
async def test_upload_url_returns_404_not_403_for_other_account(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 (not 403) when accessing User B's upload URL."""
    from app.models.file_upload import FileUpload

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-upl-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-upl-b")

    upload_b = FileUpload(
        account_id=acct_b.id,
        uploaded_by=user_b.id,
        filename="secret.png",
        content_type="image/png",
        size_bytes=1024,
        storage_key="test/secret.png",
    )
    test_db.add(upload_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/uploads/{upload_b.id}/url", headers=headers_a)
    assert resp.status_code in (404, 503), (
        f"Expected 404 (or 503 if storage not configured) for cross-account upload, got {resp.status_code}"
    )


@pytest.mark.asyncio
async def test_share_revoke_returns_404_not_403_for_other_user(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 (not 403) when revoking User B's share."""
    from app.models.session import Session
    from app.models.session_share import SessionShare

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-shr-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-shr-b")
    tree_b = await _create_private_tree(test_db, acct_b, user_b)

    session_b = Session(
        tree_id=tree_b.id,
        user_id=user_b.id,
        account_id=acct_b.id,
        tree_snapshot={"id": "root", "type": "start", "children": []},
        path_taken=[],
        decisions=[],
    )
    test_db.add(session_b)
    await test_db.flush()

    share_b = SessionShare(
        session_id=session_b.id,
        account_id=acct_b.id,
        share_token="test-token-unique-" + uuid.uuid4().hex[:8],
        share_name="Test",
        visibility="public",
        created_by=user_b.id,
    )
    test_db.add(share_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.delete(f"/api/v1/shares/{share_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-user share revoke, got {resp.status_code}"
    )


# ── Task 6 (continued): steps, tags, step_categories, maintenance_schedules ──


@pytest.mark.asyncio
async def test_cannot_access_other_account_step(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 when reading a team-visibility step owned by Account B."""
    from app.models.step_library import StepLibrary

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-step-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-step-b")

    # Create a team-visibility step owned by account B
    step_b = StepLibrary(
        title="Account B Confidential Step",
        step_type="action",
        content={"description": "secret step"},
        created_by=user_b.id,
        account_id=acct_b.id,
        visibility="team",
        is_active=True,
    )
    test_db.add(step_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/steps/{step_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-account step access, got {resp.status_code}: {resp.text}"
    )


@pytest.mark.asyncio
async def test_cannot_access_other_account_tag(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 when reading a tag scoped to Account B."""
    from app.models.tag import TreeTag

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-tag-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-tag-b")

    # Create an account-scoped tag for account B
    tag_b = TreeTag(
        name=f"account-b-tag-{uuid.uuid4().hex[:6]}",
        slug=f"account-b-tag-{uuid.uuid4().hex[:6]}",
        account_id=acct_b.id,
    )
    test_db.add(tag_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/tags/{tag_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-account tag access, got {resp.status_code}: {resp.text}"
    )


@pytest.mark.asyncio
async def test_cannot_access_other_account_step_category(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 when reading a step category scoped to Account B."""
    from app.models.step_category import StepCategory

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-scat-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-scat-b")

    # Create an account-scoped step category for account B
    category_b = StepCategory(
        name=f"Account B Category {uuid.uuid4().hex[:6]}",
        slug=f"account-b-cat-{uuid.uuid4().hex[:6]}",
        account_id=acct_b.id,
        is_active=True,
    )
    test_db.add(category_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/step-categories/{category_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-account step category access, got {resp.status_code}: {resp.text}"
    )


@pytest.mark.asyncio
async def test_maintenance_schedule_returns_404_for_other_team(
    client: AsyncClient, test_db: AsyncSession
):
    """User A gets 404 when reading a maintenance schedule belonging to Team B's tree."""
    from app.models.team import Team
    from app.models.maintenance_schedule import MaintenanceSchedule

    # Create two separate teams
    team_a = Team(name="Team A Corp")
    team_b = Team(name="Team B Corp")
    test_db.add_all([team_a, team_b])
    await test_db.flush()

    # Create accounts and users, assign to respective teams
    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "t6-ms-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "t6-ms-b")
    user_a.team_id = team_a.id
    user_b.team_id = team_b.id
    await test_db.flush()

    # Create a maintenance tree owned by team B
    tree_b = Tree(
        name="Team B Maintenance Flow",
        account_id=acct_b.id,
        author_id=user_b.id,
        team_id=team_b.id,
        visibility="team",
        tree_type="maintenance",
        tree_structure={"id": "root", "type": "start", "children": []},
        is_active=True,
        status="published",
    )
    test_db.add(tree_b)
    await test_db.flush()

    # Create a schedule for that tree
    schedule_b = MaintenanceSchedule(
        tree_id=tree_b.id,
        account_id=acct_b.id,
        created_by=user_b.id,
        cron_expression="0 2 * * 0",
        timezone="UTC",
        is_active=True,
        next_run_at=dt.datetime(2026, 12, 31, tzinfo=dt.timezone.utc),
    )
    test_db.add(schedule_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(f"/api/v1/maintenance-schedules/tree/{tree_b.id}", headers=headers_a)
    assert resp.status_code == 404, (
        f"Expected 404 for cross-team maintenance schedule access, got {resp.status_code}: {resp.text}"
    )


@pytest.mark.asyncio
async def test_get_documentation_returns_404_for_other_user_session(
    client: AsyncClient, test_db: AsyncSession
):
    """GET /ai-sessions/{id}/documentation must return 404 (not 403) for cross-user access."""
    from app.models.ai_session import AISession

    acct_a, user_a, pass_a = await _create_account_and_user(test_db, "doc-a")
    acct_b, user_b, pass_b = await _create_account_and_user(test_db, "doc-b")

    session_b = AISession(
        user_id=user_b.id,
        account_id=acct_b.id,
        problem_summary="B's confidential session",
        problem_domain="networking",
        status="resolved",
    )
    test_db.add(session_b)
    await test_db.commit()

    headers_a = await _login(client, user_a.email, pass_a)
    resp = await client.get(
        f"/api/v1/ai-sessions/{session_b.id}/documentation",
        headers=headers_a,
    )
    assert resp.status_code == 404, f"Expected 404, got {resp.status_code}: {resp.text}"