"""
Task Assignment API tests.
Tests for task assignment endpoints.
"""
import pytest
import uuid
import json
from fastapi.testclient import TestClient
from main import app
from database import get_db_connection, init_database
from services.jwt_service import JWTService
import bcrypt


# 测试客户端
client = TestClient(app)


@pytest.fixture(scope="module")
def setup_database():
    """初始化测试数据库"""
    init_database()
    yield


@pytest.fixture
def admin_user(setup_database):
    """创建管理员用户"""
    admin_id = f"admin_{uuid.uuid4().hex[:8]}"
    password_hash = bcrypt.hashpw("admin123".encode(), bcrypt.gensalt()).decode()
    
    with get_db_connection() as conn:
        cursor = conn.cursor()
        cursor.execute("""
            INSERT INTO users (id, username, email, password_hash, role)
            VALUES (?, ?, ?, ?, 'admin')
        """, (admin_id, f"test_admin_{admin_id}", f"admin_{admin_id}@test.com", password_hash))
    
    user_data = {
        "id": admin_id,
        "username": f"test_admin_{admin_id}",
        "email": f"admin_{admin_id}@test.com",
        "role": "admin"
    }
    token = JWTService.create_access_token(user_data)
    
    yield {"token": token, "user_id": admin_id, "user_data": user_data}
    
    # 清理
    with get_db_connection() as conn:
        cursor = conn.cursor()
        cursor.execute("DELETE FROM users WHERE id = ?", (admin_id,))


@pytest.fixture
def annotator_users(setup_database):
    """创建多个标注人员用户"""
    annotators = []
    
    for i in range(3):
        annotator_id = f"annotator_{uuid.uuid4().hex[:8]}"
        password_hash = bcrypt.hashpw("annotator123".encode(), bcrypt.gensalt()).decode()
        
        with get_db_connection() as conn:
            cursor = conn.cursor()
            cursor.execute("""
                INSERT INTO users (id, username, email, password_hash, role)
                VALUES (?, ?, ?, ?, 'annotator')
            """, (annotator_id, f"test_annotator_{annotator_id}", f"annotator_{annotator_id}@test.com", password_hash))
        
        user_data = {
            "id": annotator_id,
            "username": f"test_annotator_{annotator_id}",
            "email": f"annotator_{annotator_id}@test.com",
            "role": "annotator"
        }
        token = JWTService.create_access_token(user_data)
        
        annotators.append({"token": token, "user_id": annotator_id, "user_data": user_data})
    
    yield annotators
    
    # 清理
    with get_db_connection() as conn:
        cursor = conn.cursor()
        for annotator in annotators:
            cursor.execute("DELETE FROM users WHERE id = ?", (annotator["user_id"],))


@pytest.fixture
def test_project(setup_database):
    """创建测试项目"""
    project_id = f"proj_{uuid.uuid4().hex[:8]}"
    
    with get_db_connection() as conn:
        cursor = conn.cursor()
        cursor.execute("""
            INSERT INTO projects (id, name, description, config)
            VALUES (?, ?, ?, ?)
        """, (project_id, "Test Project", "Test Description", "<View></View>"))
    
    yield project_id
    
    # 清理
    with get_db_connection() as conn:
        cursor = conn.cursor()
        cursor.execute("DELETE FROM projects WHERE id = ?", (project_id,))


@pytest.fixture
def test_tasks(setup_database, test_project):
    """创建测试任务"""
    task_ids = []
    
    for i in range(5):
        task_id = f"task_{uuid.uuid4().hex[:8]}"
        data = json.dumps({"items": [{"id": j} for j in range(3)]})
        
        with get_db_connection() as conn:
            cursor = conn.cursor()
            cursor.execute("""
                INSERT INTO tasks (id, project_id, name, data, status)
                VALUES (?, ?, ?, ?, 'pending')
            """, (task_id, test_project, f"Test Task {i}", data))
        
        task_ids.append(task_id)
    
    yield task_ids
    
    # 清理
    with get_db_connection() as conn:
        cursor = conn.cursor()
        for task_id in task_ids:
            cursor.execute("DELETE FROM tasks WHERE id = ?", (task_id,))


class TestTaskAssignment:
    """单个任务分配测试"""
    
    def test_assign_task_without_auth(self, setup_database, test_tasks):
        """未认证时应返回 401"""
        response = client.put(
            f"/api/tasks/{test_tasks[0]}/assign",
            json={"user_id": "some_user"}
        )
        assert response.status_code == 401
    
    def test_assign_task_as_annotator(self, annotator_users, test_tasks):
        """标注人员分配任务应返回 403"""
        headers = {"Authorization": f"Bearer {annotator_users[0]['token']}"}
        response = client.put(
            f"/api/tasks/{test_tasks[0]}/assign",
            json={"user_id": annotator_users[1]["user_id"]},
            headers=headers
        )
        assert response.status_code == 403
    
    def test_assign_task_as_admin(self, admin_user, annotator_users, test_tasks):
        """管理员可以分配任务"""
        headers = {"Authorization": f"Bearer {admin_user['token']}"}
        response = client.put(
            f"/api/tasks/{test_tasks[0]}/assign",
            json={"user_id": annotator_users[0]["user_id"]},
            headers=headers
        )
        assert response.status_code == 200
        data = response.json()
        assert data["task_id"] == test_tasks[0]
        assert data["assigned_to"] == annotator_users[0]["user_id"]
        assert data["assigned_by"] == admin_user["user_id"]
    
    def test_assign_nonexistent_task(self, admin_user, annotator_users):
        """分配不存在的任务应返回 404"""
        headers = {"Authorization": f"Bearer {admin_user['token']}"}
        response = client.put(
            "/api/tasks/nonexistent_task/assign",
            json={"user_id": annotator_users[0]["user_id"]},
            headers=headers
        )
        assert response.status_code == 404
    
    def test_assign_to_nonexistent_user(self, admin_user, test_tasks):
        """分配给不存在的用户应返回 404"""
        headers = {"Authorization": f"Bearer {admin_user['token']}"}
        response = client.put(
            f"/api/tasks/{test_tasks[0]}/assign",
            json={"user_id": "nonexistent_user"},
            headers=headers
        )
        assert response.status_code == 404


class TestBatchAssignment:
    """批量任务分配测试"""
    
    def test_batch_assign_without_auth(self, setup_database, test_tasks, annotator_users):
        """未认证时应返回 401"""
        response = client.post(
            "/api/tasks/batch-assign",
            json={
                "task_ids": test_tasks[:2],
                "user_ids": [annotator_users[0]["user_id"]],
                "mode": "round_robin"
            }
        )
        assert response.status_code == 401
    
    def test_batch_assign_round_robin(self, admin_user, annotator_users, test_tasks):
        """轮询分配模式测试"""
        headers = {"Authorization": f"Bearer {admin_user['token']}"}
        user_ids = [a["user_id"] for a in annotator_users[:2]]
        
        response = client.post(
            "/api/tasks/batch-assign",
            json={
                "task_ids": test_tasks,
                "user_ids": user_ids,
                "mode": "round_robin"
            },
            headers=headers
        )
        
        assert response.status_code == 200
        data = response.json()
        assert data["success_count"] == len(test_tasks)
        assert data["failed_count"] == 0
        
        # 验证轮询分配
        assignments = data["assignments"]
        for i, assignment in enumerate(assignments):
            expected_user = user_ids[i % len(user_ids)]
            assert assignment["assigned_to"] == expected_user
    
    def test_batch_assign_equal(self, admin_user, annotator_users, test_tasks):
        """平均分配模式测试"""
        headers = {"Authorization": f"Bearer {admin_user['token']}"}
        user_ids = [a["user_id"] for a in annotator_users[:2]]
        
        response = client.post(
            "/api/tasks/batch-assign",
            json={
                "task_ids": test_tasks,
                "user_ids": user_ids,
                "mode": "equal"
            },
            headers=headers
        )
        
        assert response.status_code == 200
        data = response.json()
        assert data["success_count"] == len(test_tasks)
        
        # 验证平均分配：每个用户分配的任务数差异不超过 1
        user_task_counts = {}
        for assignment in data["assignments"]:
            user_id = assignment["assigned_to"]
            user_task_counts[user_id] = user_task_counts.get(user_id, 0) + 1
        
        counts = list(user_task_counts.values())
        assert max(counts) - min(counts) <= 1
    
    def test_batch_assign_invalid_mode(self, admin_user, annotator_users, test_tasks):
        """无效分配模式应返回 400"""
        headers = {"Authorization": f"Bearer {admin_user['token']}"}
        response = client.post(
            "/api/tasks/batch-assign",
            json={
                "task_ids": test_tasks[:2],
                "user_ids": [annotator_users[0]["user_id"]],
                "mode": "invalid_mode"
            },
            headers=headers
        )
        assert response.status_code == 400


class TestMyTasks:
    """当前用户任务列表测试"""
    
    def test_my_tasks_without_auth(self, setup_database):
        """未认证时应返回 401"""
        response = client.get("/api/tasks/my-tasks")
        assert response.status_code == 401
    
    def test_my_tasks_empty(self, annotator_users):
        """没有分配任务时返回空列表"""
        headers = {"Authorization": f"Bearer {annotator_users[0]['token']}"}
        response = client.get("/api/tasks/my-tasks", headers=headers)
        assert response.status_code == 200
        data = response.json()
        assert data["total"] == 0
        assert data["tasks"] == []
    
    def test_my_tasks_with_assignments(self, admin_user, annotator_users, test_tasks):
        """分配任务后可以看到自己的任务"""
        # 先分配任务
        admin_headers = {"Authorization": f"Bearer {admin_user['token']}"}
        target_user = annotator_users[0]
        
        # 分配 2 个任务给第一个标注人员
        for task_id in test_tasks[:2]:
            client.put(
                f"/api/tasks/{task_id}/assign",
                json={"user_id": target_user["user_id"]},
                headers=admin_headers
            )
        
        # 查询自己的任务
        user_headers = {"Authorization": f"Bearer {target_user['token']}"}
        response = client.get("/api/tasks/my-tasks", headers=user_headers)
        
        assert response.status_code == 200
        data = response.json()
        assert data["total"] == 2
        assert len(data["tasks"]) == 2
        
        # 验证所有任务都是分配给当前用户的
        for task in data["tasks"]:
            assert task["assigned_to"] == target_user["user_id"]
    
    def test_my_tasks_only_shows_own_tasks(self, admin_user, annotator_users, test_tasks):
        """标注人员只能看到分配给自己的任务"""
        admin_headers = {"Authorization": f"Bearer {admin_user['token']}"}
        
        # 分配不同任务给不同用户
        client.put(
            f"/api/tasks/{test_tasks[0]}/assign",
            json={"user_id": annotator_users[0]["user_id"]},
            headers=admin_headers
        )
        client.put(
            f"/api/tasks/{test_tasks[1]}/assign",
            json={"user_id": annotator_users[1]["user_id"]},
            headers=admin_headers
        )
        
        # 第一个用户只能看到自己的任务
        user1_headers = {"Authorization": f"Bearer {annotator_users[0]['token']}"}
        response1 = client.get("/api/tasks/my-tasks", headers=user1_headers)
        data1 = response1.json()
        
        for task in data1["tasks"]:
            assert task["assigned_to"] == annotator_users[0]["user_id"]
        
        # 第二个用户只能看到自己的任务
        user2_headers = {"Authorization": f"Bearer {annotator_users[1]['token']}"}
        response2 = client.get("/api/tasks/my-tasks", headers=user2_headers)
        data2 = response2.json()
        
        for task in data2["tasks"]:
            assert task["assigned_to"] == annotator_users[1]["user_id"]