"""Integration tests for native Projects, Tasks hierarchy, and QC gating invariants."""
import uuid
from datetime import date
import pytest
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker

import pytest_asyncio

from app.models import (
    Base,
    PMUser,
    Project,
    ProjectMember,
    ProjectStatus,
    QCAnswer,
    QCQuestionPhase,
    Task,
    TaskPriority,
    TaskQCDefinition,
    TaskQCQuestion,
    TaskQCResult,
    TaskStatus,
)
from app.qc_service import build_state, load_definitions


@pytest_asyncio.fixture
async def async_db():
    engine = create_async_engine("sqlite+aiosqlite:///:memory:", echo=False)
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

    async_session = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
    async with async_session() as session:
        yield session

    await engine.dispose()



@pytest.mark.asyncio
async def test_project_and_members_creation(async_db: AsyncSession):
    # 1. Create a user
    user = PMUser(
        username="manager1",
        password_hash="fake",
        display_name="مهندس مدیر",
        role="project_manager",
    )
    async_db.add(user)
    await async_db.commit()

    # 2. Create a project
    project = Project(
        name="پروژه برج بهارستان",
        description="ساخت مجتمع ۲۰ طبقه",
        location="تهران",
        project_manager="مهندس مدیر",
        status=ProjectStatus.ACTIVE.value,
        planned_start=date(2026, 9, 1),
        planned_end=date(2027, 9, 1),
    )
    async_db.add(project)
    await async_db.flush()

    # 3. Add a project member
    member = ProjectMember(
        project_id=project.id,
        user_id=user.id,
        role="project_manager",
    )
    async_db.add(member)
    await async_db.commit()

    # Verify project
    loaded = await async_db.scalar(select(Project).where(Project.id == project.id))
    assert loaded is not None
    assert loaded.name == "پروژه برج بهارستان"
    assert loaded.status == "ACTIVE"


@pytest.mark.asyncio
async def test_hierarchical_tasks(async_db: AsyncSession):
    # Setup project
    project = Project(name="پروژه تست ساختار شکست")
    async_db.add(project)
    await async_db.commit()

    # 1. Phase 1 (Root Task)
    phase1 = Task(
        project_id=project.id,
        parent_id=None,
        title="فاز ۱: اسکلت فلزی",
        status=TaskStatus.TODO.value,
    )
    async_db.add(phase1)
    await async_db.flush()

    # 2. Activity (Subtask under Phase 1)
    activity1 = Task(
        project_id=project.id,
        parent_id=phase1.id,
        title="فعالیت ۱.۱: نصب ستون‌های طبقه اول",
        status=TaskStatus.TODO.value,
    )
    async_db.add(activity1)
    await async_db.flush()

    # 3. Subtask under Activity
    subtask1 = Task(
        project_id=project.id,
        parent_id=activity1.id,
        title="زیرتسک ۱.۱.۱: بولت‌گذاری و تراز پایه",
        status=TaskStatus.TODO.value,
    )
    async_db.add(subtask1)
    await async_db.commit()

    # Query hierarchy
    root = await async_db.scalar(select(Task).where(Task.id == phase1.id))
    assert root is not None
    assert root.parent_id is None

    leaf = await async_db.scalar(select(Task).where(Task.id == subtask1.id))
    assert leaf is not None
    assert leaf.parent_id == activity1.id


@pytest.mark.asyncio
async def test_qc_gating_invariants(async_db: AsyncSession):
    project = Project(name="پروژه تست کیفیت")
    async_db.add(project)
    await async_db.commit()

    task = Task(
        project_id=project.id,
        title="بتن‌ریزی فونداسیون",
        status=TaskStatus.TODO.value,
    )
    async_db.add(task)
    await async_db.flush()

    # Create task QC definition with 1 pre-execution question and 1 execution question
    qc_def = TaskQCDefinition(task_id=task.id, name="چک‌لیست بتن‌ریزی")
    async_db.add(qc_def)
    await async_db.flush()

    q_pre = TaskQCQuestion(
        definition_id=qc_def.id,
        phase=QCQuestionPhase.pre,
        text="آیا آرماتوربندی و قالب‌بندی بازرسی و تأیید شد؟",
        required=True,
        sort_order=1,
    )
    q_exec = TaskQCQuestion(
        definition_id=qc_def.id,
        phase=QCQuestionPhase.during,
        text="آیا اسلامپ بتن در محدوده استاندارد است؟",
        required=True,
        sort_order=2,
    )
    async_db.add_all([q_pre, q_exec])
    await async_db.commit()

    task_id = task.id

    # Invariant Rule 1 check: Before answering pre-QC, can_start must be FALSE
    defs = await load_definitions(async_db, task_id)
    state = build_state(defs)
    assert state.can_start is False
    assert state.can_complete is False

    # Now pass the pre-QC question
    res_pre = TaskQCResult(question_id=q_pre.id, question=q_pre, answer=QCAnswer.pass_)
    async_db.add(res_pre)
    await async_db.commit()

    # Load fresh definitions in new query
    defs = await load_definitions(async_db, task_id)
    state = build_state(defs)
    # can_start is now TRUE! Progress can become > 0
    assert state.can_start is True
    # But can_complete is still FALSE because execution question is not yet answered!
    assert state.can_complete is False

    # Now pass the execution question as well
    res_exec = TaskQCResult(question_id=q_exec.id, question=q_exec, answer=QCAnswer.pass_)
    async_db.add(res_exec)
    await async_db.commit()

    defs = await load_definitions(async_db, task_id)
    state = build_state(defs)
    # Both can_start and can_complete are now TRUE!
    assert state.can_start is True
    assert state.can_complete is True