from __future__ import annotations

from datetime import datetime, timezone

from fastapi.testclient import TestClient

from app.domain.models import User
from app.main import app
from app.services.user_service import UserService, get_user_service


class FakeUserRepo:
    def __init__(self) -> None:
        self.users: dict[str, User] = {}
        self.next_id = 1

    def get_user(self, user_id: str) -> User:
        user = self.users.get(user_id)
        if user is None:
            raise ValueError("사용자를 찾을 수 없습니다")
        return user

    def list_users(self) -> list[User]:
        return sorted(self.users.values(), key=lambda user: user.username)

    def create_user(self, username: str, *, email: str | None = None) -> User:
        if any(user.username == username for user in self.users.values()):
            raise ValueError(f"이미 존재하는 username입니다: {username}")
        if email is not None and any(user.email == email for user in self.users.values()):
            raise ValueError(f"이미 존재하는 email입니다: {email}")
        now = datetime.now(timezone.utc)
        user = User(
            id=f"user-{self.next_id}",
            username=username,
            email=email,
            created_at=now,
            updated_at=now,
        )
        self.next_id += 1
        self.users[user.id] = user
        return user

    def update_user(self, user_id: str, *, username: str | None = None, email: str | None = None) -> User:
        user = self.get_user(user_id)
        if username is not None and any(item.id != user_id and item.username == username for item in self.users.values()):
            raise ValueError(f"이미 존재하는 username입니다: {username}")
        if email is not None and any(item.id != user_id and item.email == email for item in self.users.values()):
            raise ValueError(f"이미 존재하는 email입니다: {email}")
        if username is not None:
            user.username = username
        if email is not None:
            user.email = email
        user.updated_at = datetime.now(timezone.utc)
        return user

    def delete_user(self, user_id: str) -> None:
        if user_id not in self.users:
            raise ValueError("사용자를 찾을 수 없습니다")
        del self.users[user_id]


def _client_with_repo(monkeypatch, repo: FakeUserRepo) -> TestClient:
    monkeypatch.setenv("PORTFOLIOHUB_DB_ENABLED", "false")
    monkeypatch.setenv("PORTFOLIOHUB_ADMIN_TOKENS", "admin-token")
    monkeypatch.setenv("PORTFOLIOHUB_READ_TOKENS", "read-token")
    from app.core.config import get_settings

    get_settings.cache_clear()
    app.dependency_overrides.clear()
    app.dependency_overrides[get_user_service] = lambda: UserService(repo)
    return TestClient(app)


def test_list_users_requires_admin(monkeypatch) -> None:
    client = _client_with_repo(monkeypatch, FakeUserRepo())

    response = client.get("/users", headers={"Authorization": "Bearer read-token"})

    app.dependency_overrides.clear()
    assert response.status_code == 403
    assert response.json()["detail"] == "Insufficient permission"


def test_list_users_returns_payload(monkeypatch) -> None:
    repo = FakeUserRepo()
    repo.create_user("alice", email="alice@example.com")
    client = _client_with_repo(monkeypatch, repo)

    response = client.get("/users", headers={"Authorization": "Bearer admin-token"})

    app.dependency_overrides.clear()
    assert response.status_code == 200
    payload = response.json()
    assert len(payload) == 1
    assert payload[0]["username"] == "alice"


def test_create_user_rejects_duplicate_username(monkeypatch) -> None:
    repo = FakeUserRepo()
    repo.create_user("alice")
    client = _client_with_repo(monkeypatch, repo)

    response = client.post(
        "/users",
        headers={"Authorization": "Bearer admin-token"},
        json={"username": "alice", "email": "alice2@example.com"},
    )

    app.dependency_overrides.clear()
    assert response.status_code == 409
    assert "이미 존재하는 username입니다" in response.json()["detail"]


def test_get_update_and_delete_user_flow(monkeypatch) -> None:
    repo = FakeUserRepo()
    user = repo.create_user("alice", email="alice@example.com")
    client = _client_with_repo(monkeypatch, repo)

    get_response = client.get(f"/users/{user.id}", headers={"Authorization": "Bearer admin-token"})
    update_response = client.patch(
        f"/users/{user.id}",
        headers={"Authorization": "Bearer admin-token"},
        json={"username": "alice-updated"},
    )
    delete_response = client.delete(f"/users/{user.id}", headers={"Authorization": "Bearer admin-token"})

    app.dependency_overrides.clear()
    assert get_response.status_code == 200
    assert get_response.json()["username"] == "alice"
    assert update_response.status_code == 200
    assert update_response.json()["username"] == "alice-updated"
    assert delete_response.status_code == 204