"""Tests for Permissions plugin — permissions, share links, public access, 403 enforcement."""

from __future__ import annotations

import uuid
from datetime import datetime, timedelta, timezone

import pytest
import pytest_asyncio
from httpx import ASGITransport, AsyncClient
from sqlalchemy.ext.asyncio import AsyncEngine, async_sessionmaker, AsyncSession

from app.core.db import reset_engine_for_testing, close_engine
from app.core.service_container import get_container
from app.main import create_app
from app.plugins.registry import reset_registry_for_testing
from app.plugins.builtins.permissions import PermissionsPlugin
from app.services.plugin_service import reset_plugin_service_for_testing
from tests.conftest import seed_tenant_and_users, login_client, ORIGIN_HEADER


@pytest_asyncio.fixture
async def plugin_app(engine: AsyncEngine, redis_client):
    """FastAPI app with permissions plugin registered."""
    reset_engine_for_testing(engine)
    app = create_app()

    registry = reset_registry_for_testing()
    registry.initialize(engine, app)

    container = get_container()
    await container.initialize()

    registry.register_plugin(PermissionsPlugin())
    reset_plugin_service_for_testing(registry)

    yield app
    await close_engine()


@pytest_asyncio.fixture
async def plugin_client(plugin_app) -> AsyncClient:
    transport = ASGITransport(app=plugin_app)
    async with AsyncClient(transport=transport, base_url="http://test") as c:
        yield c


@pytest_asyncio.fixture
async def authed_client(plugin_client: AsyncClient, db_session: AsyncSession) -> AsyncClient:
    """Authenticated admin client with seeded data."""
    seed = await seed_tenant_and_users(db_session)
    await login_client(plugin_client, "admin@tenanta.com")
    resp = await plugin_client.post("/api/v1/plugins/permissions/install", headers=ORIGIN_HEADER)
    assert resp.status_code == 200
    resp = await plugin_client.post("/api/v1/plugins/permissions/activate", headers=ORIGIN_HEADER)
    assert resp.status_code == 200
    return plugin_client, seed


@pytest.mark.asyncio
async def test_list_permissions_empty(authed_client: AsyncClient):
    """AC1: GET /api/v1/dms/files/{id}/permissions → 200 + permission list."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    resp = await client.get(f"/api/v1/dms/files/{file_id}/permissions", headers=ORIGIN_HEADER)
    assert resp.status_code == 200
    assert resp.json() == []


@pytest.mark.asyncio
async def test_grant_permission(authed_client: AsyncClient):
    """POST /api/v1/dms/files/{id}/permissions → 201, permission granted."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    user_id = str(seed["admin_a"].id)

    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/permissions",
        json={"user_id": user_id, "access_level": "read"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 201
    data = resp.json()
    assert data["user_id"] == user_id
    assert data["access_level"] == "read"

    # List permissions should show it
    resp = await client.get(f"/api/v1/dms/files/{file_id}/permissions", headers=ORIGIN_HEADER)
    assert resp.status_code == 200
    assert len(resp.json()) == 1


@pytest.mark.asyncio
async def test_revoke_permission(authed_client: AsyncClient):
    """DELETE /api/v1/dms/files/{id}/permissions/{user_id} → 204."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    user_id = str(seed["admin_a"].id)

    # Grant first
    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/permissions",
        json={"user_id": user_id, "access_level": "write"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 201

    # Revoke
    resp = await client.delete(
        f"/api/v1/dms/files/{file_id}/permissions/{user_id}",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 204

    # List should be empty
    resp = await client.get(f"/api/v1/dms/files/{file_id}/permissions", headers=ORIGIN_HEADER)
    assert resp.status_code == 200
    assert resp.json() == []


@pytest.mark.asyncio
async def test_create_share_link(authed_client: AsyncClient):
    """AC4: POST /api/v1/dms/files/{id}/share-link → 200 + public token URL."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())

    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/share-link",
        json={"access_level": "download"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    assert "token" in data
    assert "public_url" in data
    assert data["has_password"] is False
    assert data["file_id"] == file_id


@pytest.mark.asyncio
async def test_share_link_with_password(authed_client: AsyncClient):
    """Share link with password — POST verify with correct password succeeds."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())

    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/share-link",
        json={"password": "Secret123", "access_level": "download"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    data = resp.json()
    assert data["has_password"] is True
    token = data["token"]

    # GET without password → 401
    resp = await client.get(f"/api/public/share/{token}")
    assert resp.status_code == 401

    # POST with wrong password → 403
    resp = await client.post(
        f"/api/public/share/{token}",
        json={"password": "WrongPass"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 403

    # POST with correct password → 200
    resp = await client.post(
        f"/api/public/share/{token}",
        json={"password": "Secret123"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    assert resp.json()["file_id"] == file_id


@pytest.mark.asyncio
async def test_expired_share_link(authed_client: AsyncClient):
    """AC5: GET /api/public/share/{token} with expired link → 410."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())

    # Create link with expiry in the past
    past = datetime.now(timezone.utc) - timedelta(hours=1)
    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/share-link",
        json={"expires_at": past.isoformat(), "access_level": "download"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    token = resp.json()["token"]

    # GET → 410 Gone
    resp = await client.get(f"/api/public/share/{token}")
    assert resp.status_code == 410


@pytest.mark.asyncio
async def test_public_share_no_password(authed_client: AsyncClient):
    """Public share link without password — GET returns file info."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())

    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/share-link",
        json={"access_level": "preview"},
        headers=ORIGIN_HEADER,
    )
    token = resp.json()["token"]

    # Public GET — no auth, no Origin header needed
    resp = await client.get(f"/api/public/share/{token}")
    assert resp.status_code == 200
    data = resp.json()
    assert data["file_id"] == file_id
    assert data["access_level"] == "preview"


@pytest.mark.asyncio
async def test_revoke_share_link(authed_client: AsyncClient):
    """DELETE /api/v1/dms/share-links/{id} → 204, link revoked."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())

    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/share-link",
        json={"access_level": "download"},
        headers=ORIGIN_HEADER,
    )
    link_id = resp.json()["id"]

    resp = await client.delete(f"/api/v1/dms/share-links/{link_id}", headers=ORIGIN_HEADER)
    assert resp.status_code == 204


@pytest.mark.asyncio
async def test_permission_403_for_unauthorized_user(plugin_client: AsyncClient, db_session: AsyncSession):
    """AC14: Folder permissions enforced: user without read → 403.

    The permissions plugin does not intercept file access (no DMS file system yet).
    We test the permission check helper directly: a user with no permission record
    gets denied (False), which translates to 403 at the route layer.
    """
    from app.plugins.builtins.permissions.routes import check_user_file_permission
    from app.core.db import get_session_factory

    seed = await seed_tenant_and_users(db_session)
    await login_client(plugin_client, "admin@tenanta.com")

    # Install + activate permissions plugin
    registry = reset_registry_for_testing()
    # We need to set up the registry properly
    # Since plugin_client fixture wasn't used, manually install
    resp = await plugin_client.post("/api/v1/plugins/permissions/install", headers=ORIGIN_HEADER)
    assert resp.status_code == 200
    resp = await plugin_client.post("/api/v1/plugins/permissions/activate", headers=ORIGIN_HEADER)
    assert resp.status_code == 200

    file_id = uuid.uuid4()
    tenant_id = seed["tenant_a"].id
    viewer_id = seed["viewer_a"].id
    admin_id = seed["admin_a"].id

    # No permission record for viewer → check returns False
    factory = get_session_factory()
    async with factory() as session:
        has_perm = await check_user_file_permission(session, tenant_id, file_id, viewer_id, "read")
        assert has_perm is False

        # Grant read to admin
        from app.plugins.builtins.permissions.models import Permission
        perm = Permission(
            tenant_id=tenant_id,
            file_id=file_id,
            user_id=admin_id,
            access_level="read",
        )
        session.add(perm)
        await session.flush()

        has_perm = await check_user_file_permission(session, tenant_id, file_id, admin_id, "read")
        assert has_perm is True

        # Viewer still has no permission
        has_perm = await check_user_file_permission(session, tenant_id, file_id, viewer_id, "read")
        assert has_perm is False
        await session.rollback()


@pytest.mark.asyncio
async def test_list_permissions_invalid_file_id(authed_client: AsyncClient):
    """GET /api/v1/dms/files/{invalid}/permissions → 400."""
    client, seed = authed_client
    resp = await client.get("/api/v1/dms/files/bad-uuid/permissions", headers=ORIGIN_HEADER)
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_grant_permission_duplicate(authed_client: AsyncClient):
    """POST /api/v1/dms/files/{id}/permissions twice → 409."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    user_id = str(seed["admin_a"].id)
    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/permissions",
        json={"user_id": user_id, "access_level": "read"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 201
    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/permissions",
        json={"user_id": user_id, "access_level": "read"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 409


@pytest.mark.asyncio
async def test_grant_permission_invalid_ids(authed_client: AsyncClient):
    """POST /api/v1/dms/files/{invalid}/permissions → 400."""
    client, seed = authed_client
    resp = await client.post(
        "/api/v1/dms/files/bad-uuid/permissions",
        json={"user_id": str(uuid.uuid4()), "access_level": "read"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_grant_permission_with_group(authed_client: AsyncClient):
    """POST /api/v1/dms/files/{id}/permissions with group_id → 201."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    user_id = str(seed["admin_a"].id)
    group_id = str(uuid.uuid4())
    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/permissions",
        json={"user_id": user_id, "group_id": group_id, "access_level": "read"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 201
    assert resp.json()["group_id"] == group_id


@pytest.mark.asyncio
async def test_revoke_permission_not_found(authed_client: AsyncClient):
    """DELETE /api/v1/dms/files/{id}/permissions/{user_id} with no perms → 404."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    user_id = str(seed["admin_a"].id)
    resp = await client.delete(
        f"/api/v1/dms/files/{file_id}/permissions/{user_id}",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 404


@pytest.mark.asyncio
async def test_revoke_permission_invalid_ids(authed_client: AsyncClient):
    """DELETE /api/v1/dms/files/{invalid}/permissions/{user_id} → 400."""
    client, seed = authed_client
    user_id = str(seed["admin_a"].id)
    resp = await client.delete(
        f"/api/v1/dms/files/bad-uuid/permissions/{user_id}",
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_create_share_link_invalid_file_id(authed_client: AsyncClient):
    """POST /api/v1/dms/files/{invalid}/share-link → 400."""
    client, seed = authed_client
    resp = await client.post(
        "/api/v1/dms/files/bad-uuid/share-link",
        json={"access_level": "download"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_revoke_share_link_not_found(authed_client: AsyncClient):
    """DELETE /api/v1/dms/share-links/{nonexistent} → 404."""
    client, seed = authed_client
    resp = await client.delete(f"/api/v1/dms/share-links/{uuid.uuid4()}", headers=ORIGIN_HEADER)
    assert resp.status_code == 404


@pytest.mark.asyncio
async def test_revoke_share_link_invalid_id(authed_client: AsyncClient):
    """DELETE /api/v1/dms/share-links/{invalid} → 400."""
    client, seed = authed_client
    resp = await client.delete("/api/v1/dms/share-links/bad-uuid", headers=ORIGIN_HEADER)
    assert resp.status_code == 400


@pytest.mark.asyncio
async def test_public_access_not_found(authed_client: AsyncClient):
    """GET /api/public/share/{nonexistent} → 404."""
    client, seed = authed_client
    resp = await client.get("/api/public/share/nonexistent-token-xyz")
    assert resp.status_code == 404


@pytest.mark.asyncio
async def test_public_access_post_not_found(authed_client: AsyncClient):
    """POST /api/public/share/{nonexistent} → 404."""
    client, seed = authed_client
    resp = await client.post(
        "/api/public/share/nonexistent-token-xyz",
        json={"password": "test"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 404


@pytest.mark.asyncio
async def test_public_access_post_expired(authed_client: AsyncClient):
    """POST /api/public/share/{token} with expired link → 410."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    past = datetime.now(timezone.utc) - timedelta(hours=1)
    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/share-link",
        json={"expires_at": past.isoformat(), "access_level": "download"},
        headers=ORIGIN_HEADER,
    )
    token = resp.json()["token"]
    resp = await client.post(
        f"/api/public/share/{token}",
        json={"password": "test"},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 410


@pytest.mark.asyncio
async def test_public_access_post_no_password_required(authed_client: AsyncClient):
    """POST /api/public/share/{token} for link without password → 200."""
    client, seed = authed_client
    file_id = str(uuid.uuid4())
    resp = await client.post(
        f"/api/v1/dms/files/{file_id}/share-link",
        json={"access_level": "preview"},
        headers=ORIGIN_HEADER,
    )
    token = resp.json()["token"]
    resp = await client.post(
        f"/api/public/share/{token}",
        json={},
        headers=ORIGIN_HEADER,
    )
    assert resp.status_code == 200
    assert resp.json()["has_password"] is False