import os
import unittest
from tempfile import NamedTemporaryFile
from unittest.mock import AsyncMock, patch

from fastapi import HTTPException
from sqlalchemy import and_, select
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine

from app.api.projects import (
    ProjectCreateRequest,
    ProjectMembersAssignRequest,
    assign_project_members,
    create_project,
)
from app.models import Base, Notification, Project, User, UserProject


class ProjectsMemberAssignmentApiTest(unittest.IsolatedAsyncioTestCase):
    async def asyncSetUp(self) -> None:
        tmp = NamedTemporaryFile(prefix="pmflow-project-members-test-", suffix=".db", delete=False)
        tmp.close()
        self.db_path = tmp.name
        self.engine = create_async_engine(f"sqlite+aiosqlite:///{self.db_path}", future=True)
        self.session_factory = async_sessionmaker(self.engine, expire_on_commit=False, class_=AsyncSession)
        async with self.engine.begin() as conn:
            await conn.run_sync(Base.metadata.create_all)

    async def asyncTearDown(self) -> None:
        await self.engine.dispose()
        if getattr(self, "db_path", None):
            try:
                os.remove(self.db_path)
            except FileNotFoundError:
                pass

    async def _seed_users(self, db: AsyncSession) -> tuple[User, User, User]:
        boss = User(
            tenant_id=1,
            username="boss-member-test",
            email="boss-member-test@example.com",
            password_hash="x",
            name="Boss",
            role="BOSS",
            status="active",
            is_active=True,
        )
        member_a = User(
            tenant_id=1,
            username="member-a-test",
            email="member-a-test@example.com",
            password_hash="x",
            name="Member A",
            role="BE",
            status="active",
            is_active=True,
        )
        member_b = User(
            tenant_id=1,
            username="member-b-test",
            email="member-b-test@example.com",
            password_hash="x",
            name="Member B",
            role="FE",
            status="active",
            is_active=True,
        )
        db.add_all([boss, member_a, member_b])
        await db.flush()
        return boss, member_a, member_b

    async def test_create_project_assigns_requested_members_and_owner(self) -> None:
        async with self.session_factory() as db:
            boss, member_a, member_b = await self._seed_users(db)

            with (
                patch("app.api.projects.context_cache_service.invalidate_system_context", AsyncMock()),
                patch("app.api.projects.AIPMOKernelService.invalidate_world_model_cache", AsyncMock()),
            ):
                payload = await create_project(
                    body=ProjectCreateRequest(
                        title="成员分配测试项目",
                        member_user_ids=[int(member_a.id), int(member_b.id)],
                    ),
                    db=db,
                    current_user=boss,
                )

            project_id = int(payload["id"])
            assigned_rows = (
                await db.execute(
                    select(UserProject.user_id).where(
                        and_(
                            UserProject.tenant_id == 1,
                            UserProject.project_id == project_id,
                        )
                    )
                )
            ).scalars().all()
            self.assertEqual(
                sorted(int(uid) for uid in assigned_rows),
                sorted([int(boss.id), int(member_a.id), int(member_b.id)]),
            )

    async def test_assign_project_members_empty_should_notify_and_raise(self) -> None:
        async with self.session_factory() as db:
            boss, member_a, _ = await self._seed_users(db)
            project = Project(
                tenant_id=1,
                name="P-members-empty",
                title="P-members-empty",
                description="members test",
                owner_id=int(boss.id),
                status="active",
                assigned_role="backend",
                signal_count=0,
            )
            db.add(project)
            await db.flush()
            db.add(
                UserProject(
                    tenant_id=1,
                    user_id=int(member_a.id),
                    project_id=int(project.id),
                )
            )
            await db.commit()

            with self.assertRaises(HTTPException) as exc_ctx:
                await assign_project_members(
                    project_id=int(project.id),
                    body=ProjectMembersAssignRequest(member_user_ids=[]),
                    db=db,
                    current_user=boss,
                )
            self.assertEqual(exc_ctx.exception.status_code, 400)

            notifications = (
                await db.execute(
                    select(Notification).where(
                        and_(
                            Notification.tenant_id == 1,
                            Notification.user_id == int(boss.id),
                            Notification.title == "项目成员分配失败",
                        )
                    )
                )
            ).scalars().all()
            self.assertGreaterEqual(len(notifications), 1)

    async def test_assign_project_members_replaces_member_list(self) -> None:
        async with self.session_factory() as db:
            boss, member_a, member_b = await self._seed_users(db)
            project = Project(
                tenant_id=1,
                name="P-members-replace",
                title="P-members-replace",
                description="members replace test",
                owner_id=int(boss.id),
                status="active",
                assigned_role="backend",
                signal_count=0,
            )
            db.add(project)
            await db.flush()
            db.add(
                UserProject(
                    tenant_id=1,
                    user_id=int(boss.id),
                    project_id=int(project.id),
                )
            )
            await db.commit()

            with (
                patch("app.api.projects.context_cache_service.invalidate_system_context", AsyncMock()),
                patch("app.api.projects.AIPMOKernelService.invalidate_world_model_cache", AsyncMock()),
            ):
                payload = await assign_project_members(
                    project_id=int(project.id),
                    body=ProjectMembersAssignRequest(member_user_ids=[int(member_a.id), int(member_b.id)]),
                    db=db,
                    current_user=boss,
                )

            self.assertEqual(
                sorted(payload["member_user_ids"]),
                sorted([str(int(member_a.id)), str(int(member_b.id))]),
            )
            assigned_rows = (
                await db.execute(
                    select(UserProject.user_id).where(
                        and_(
                            UserProject.tenant_id == 1,
                            UserProject.project_id == int(project.id),
                        )
                    )
                )
            ).scalars().all()
            self.assertEqual(
                sorted(int(uid) for uid in assigned_rows),
                sorted([int(member_a.id), int(member_b.id)]),
            )