# tests/test_auth.py
"""Authentication endpoint tests — comprehensive edge case coverage."""

import pytest


# ──────────────────────────────────────────────
# Registration
# ──────────────────────────────────────────────

def test_register_success(client):
    resp = client.post("/api/auth/register", json={
        "user_id": "newuser", "name": "New User", "password": "TestPass1",
    })
    assert resp.status_code == 201
    data = resp.json()
    assert data["user_id"] == "newuser"
    assert "access_token" in data
    assert "refresh_token" in data
    assert data["token_type"] == "bearer"


def test_register_duplicate_username(client):
    payload = {"user_id": "dupuser", "password": "TestPass1"}
    client.post("/api/auth/register", json=payload)
    resp = client.post("/api/auth/register", json=payload)
    assert resp.status_code == 409
    assert "taken" in resp.json()["detail"].lower()


def test_register_duplicate_email(client):
    client.post("/api/auth/register", json={
        "user_id": "user1", "email": "dup@test.com", "password": "TestPass1",
    })
    resp = client.post("/api/auth/register", json={
        "user_id": "user2", "email": "dup@test.com", "password": "TestPass1",
    })
    assert resp.status_code == 409


def test_register_weak_password_too_short(client):
    resp = client.post("/api/auth/register", json={
        "user_id": "weakpwduser", "password": "abc",
    })
    assert resp.status_code == 422


def test_register_weak_password_no_uppercase(client):
    resp = client.post("/api/auth/register", json={
        "user_id": "weakpwduser", "password": "testpass1",  # no uppercase
    })
    assert resp.status_code == 422


def test_register_weak_password_no_digit(client):
    resp = client.post("/api/auth/register", json={
        "user_id": "weakpwduser", "password": "TestPassword",  # no digit
    })
    assert resp.status_code == 422


def test_register_invalid_user_id_chars(client):
    resp = client.post("/api/auth/register", json={
        "user_id": "bad user!", "password": "TestPass1",
    })
    assert resp.status_code == 422


def test_register_user_id_too_short(client):
    resp = client.post("/api/auth/register", json={
        "user_id": "ab", "password": "TestPass1",
    })
    assert resp.status_code == 422


# ──────────────────────────────────────────────
# Login
# ──────────────────────────────────────────────

def test_login_success(client):
    client.post("/api/auth/register", json={"user_id": "loginuser", "password": "TestPass1"})
    resp = client.post("/api/auth/login", json={"user_id": "loginuser", "password": "TestPass1"})
    assert resp.status_code == 200
    assert "access_token" in resp.json()
    assert "refresh_token" in resp.json()


def test_login_wrong_password(client):
    client.post("/api/auth/register", json={"user_id": "loginuser2", "password": "TestPass1"})
    resp = client.post("/api/auth/login", json={"user_id": "loginuser2", "password": "WrongPass1"})
    assert resp.status_code == 401


def test_login_nonexistent_user(client):
    resp = client.post("/api/auth/login", json={"user_id": "ghost", "password": "TestPass1"})
    assert resp.status_code == 401


def test_account_lockout_after_five_failures(client):
    """Account should lock after MAX_FAILED_LOGINS consecutive wrong passwords."""
    client.post("/api/auth/register", json={"user_id": "lockme", "password": "TestPass1"})
    for _ in range(5):
        client.post("/api/auth/login", json={"user_id": "lockme", "password": "WrongPass1"})
    resp = client.post("/api/auth/login", json={"user_id": "lockme", "password": "TestPass1"})
    # Should be locked (423) even with correct password
    assert resp.status_code == 423


def test_login_resets_failed_count(client):
    """Successful login clears failed count so subsequent login works normally."""
    client.post("/api/auth/register", json={"user_id": "almostlocked", "password": "TestPass1"})
    # 4 failures (not yet locked)
    for _ in range(4):
        client.post("/api/auth/login", json={"user_id": "almostlocked", "password": "WrongPass1"})
    # Correct login resets counter
    resp = client.post("/api/auth/login", json={"user_id": "almostlocked", "password": "TestPass1"})
    assert resp.status_code == 200
    # Next failure starts from 0 again (not locked)
    resp2 = client.post("/api/auth/login", json={"user_id": "almostlocked", "password": "WrongPass1"})
    assert resp2.status_code == 401   # not 423


# ──────────────────────────────────────────────
# Token refresh
# ──────────────────────────────────────────────

def test_refresh_token_works(client):
    reg = client.post("/api/auth/register", json={"user_id": "refreshuser", "password": "TestPass1"})
    refresh_token = reg.json()["refresh_token"]
    resp = client.post("/api/auth/refresh", json={"refresh_token": refresh_token})
    assert resp.status_code == 200
    data = resp.json()
    assert "access_token" in data
    assert "refresh_token" in data
    # New refresh token should differ from the old one
    assert data["refresh_token"] != refresh_token


def test_refresh_token_invalid(client):
    resp = client.post("/api/auth/refresh", json={"refresh_token": "fake_token_that_doesnt_exist"})
    assert resp.status_code == 401


def test_refresh_token_rotation(client):
    """Old refresh token should not work after rotation."""
    reg = client.post("/api/auth/register", json={"user_id": "rotateuser", "password": "TestPass1"})
    old_refresh = reg.json()["refresh_token"]
    # Rotate
    client.post("/api/auth/refresh", json={"refresh_token": old_refresh})
    # Try the old one again — should fail
    resp = client.post("/api/auth/refresh", json={"refresh_token": old_refresh})
    assert resp.status_code == 401


# ──────────────────────────────────────────────
# Logout
# ──────────────────────────────────────────────

def test_logout_success(client):
    reg = client.post("/api/auth/register", json={"user_id": "logoutuser", "password": "TestPass1"})
    token = reg.json()["access_token"]
    client.headers.update({"Authorization": f"Bearer {token}"})
    resp = client.post("/api/auth/logout")
    assert resp.status_code == 200


def test_blacklisted_token_rejected(client):
    """Token should be rejected after logout."""
    reg = client.post("/api/auth/register", json={"user_id": "bluser", "password": "TestPass1"})
    token = reg.json()["access_token"]
    client.headers.update({"Authorization": f"Bearer {token}"})
    client.post("/api/auth/logout")
    # Now use the same token
    resp = client.get("/api/auth/profile")
    assert resp.status_code == 401


# ──────────────────────────────────────────────
# Change password
# ──────────────────────────────────────────────

def test_change_password_success(client):
    client.post("/api/auth/register", json={"user_id": "changepwduser", "password": "OldPass1"})
    resp_login = client.post("/api/auth/login", json={"user_id": "changepwduser", "password": "OldPass1"})
    token = resp_login.json()["access_token"]
    client.headers.update({"Authorization": f"Bearer {token}"})
    resp = client.post("/api/auth/change-password", json={
        "old_password": "OldPass1",
        "new_password": "NewPass1",
    })
    assert resp.status_code == 200
    # Old password no longer works
    resp2 = client.post("/api/auth/login", json={"user_id": "changepwduser", "password": "OldPass1"})
    assert resp2.status_code == 401


def test_change_password_wrong_old(auth_client):
    client, token, user_id = auth_client
    resp = client.post("/api/auth/change-password", json={
        "old_password": "WrongOld1",
        "new_password": "NewPass1",
    })
    assert resp.status_code == 401


def test_change_password_same_as_old(auth_client):
    client, token, user_id = auth_client
    resp = client.post("/api/auth/change-password", json={
        "old_password": "TestPass1",
        "new_password": "TestPass1",
    })
    assert resp.status_code == 400


# ──────────────────────────────────────────────
# Profile
# ──────────────────────────────────────────────

def test_profile_authenticated(auth_client):
    client, token, user_id = auth_client
    resp = client.get("/api/auth/profile")
    assert resp.status_code == 200
    data = resp.json()
    assert data["user_id"] == user_id
    assert data["xp"] == 0
    assert data["level"] == 1


def test_profile_unauthenticated(client):
    resp = client.get("/api/auth/profile")
    assert resp.status_code == 401


def test_update_profile_name(auth_client):
    client, token, user_id = auth_client
    resp = client.patch("/api/auth/profile", json={"name": "Updated Name"})
    assert resp.status_code == 200
    assert resp.json()["name"] == "Updated Name"


def test_update_profile_valid_personality(auth_client):
    client, token, user_id = auth_client
    for personality in ["supportive", "drill_sergeant", "zen"]:
        resp = client.patch("/api/auth/profile", json={"coach_personality": personality})
        assert resp.status_code == 200
        assert resp.json()["coach_personality"] == personality


def test_update_profile_invalid_personality(auth_client):
    client, token, user_id = auth_client
    resp = client.patch("/api/auth/profile", json={"coach_personality": "aggressive_hacker"})
    assert resp.status_code == 422