import hashlib, base64, json, hmac
import time, os

from starlette.testclient import TestClient

os.environ.setdefault("OBSIDIAN_JWT_SECRET", "test-jwt-secret")
os.environ.setdefault("OBSIDIAN_CLI_BIN", "python")
os.environ.setdefault("OBSIDIAN_VAULT_PATH", ".")

import app.auth as authmod  # noqa: E402
from app.main import app  # noqa: E402

client = TestClient(app)

def make_jwt(claims:dict, secret:bytes = b"test-jwt-secret") -> str:
  header = {"alg": "HS256", "typ": "JWT"}

  def enc(value:dict) -> str:
    raw = json.dumps(value, separators=(",", ":")).encode()
    return base64.urlsafe_b64encode(raw).decode().rstrip("=")

  signing_input = f"{enc(header)}.{enc(claims)}"
  signature = hmac.new(secret, signing_input.encode(), hashlib.sha256).digest()
  return f"{signing_input}.{base64.urlsafe_b64encode(signature).decode().rstrip('=')}"

def jwt(claims:dict|None = None) -> str:
  claims = claims or {}
  claims.setdefault("sub", "tests")
  claims.setdefault("vaults", ["*"])
  claims.setdefault("paths", ["*"])
  claims.setdefault("commands", ["*"])
  claims.setdefault("exp", int(time.time()) + 3600)
  return make_jwt(claims)

def use_jwt_auth(monkeypatch, claims:dict) -> str:
  monkeypatch.setattr(authmod, "JWT_SECRET", "test-jwt-secret")
  return jwt(claims)

def test_health():
  response = client.get("/health")

  assert response.status_code == 200
  body = response.json()
  assert body["ok"] is True
  assert "vault" in body
  assert body["cli"] == "python"
  assert body["jwt"] is True

def test_command_requires_auth():
  response = client.post("/commands", json={"args": ["--version"]})

  assert response.status_code == 401

def test_command_runs_configured_cli_only():
  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {jwt()}"},
    json={"args": ["--version"], "timeout": 5},
  )

  assert response.status_code == 200
  body = response.json()
  assert body["exit_code"] == 0
  assert body["command"] == ["python", "--version"]
  assert "Python" in body["stdout"]
  assert body["timed_out"] is False

def test_plain_command_string_is_rejected():
  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {jwt()}"},
    json={"command": "--version"},
  )

  assert response.status_code == 400
  assert response.json()["detail"] == "command strings are not allowed; use args as a list of strings"

def test_shell_mode_is_rejected():
  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {jwt()}"},
    json={"mode": "shell", "args": ["echo nope"]},
  )

  assert response.status_code == 400
  assert response.json()["detail"] == "mode is not allowed; only the configured Obsidian CLI can be executed"

def test_command_timeout():
  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {jwt()}"},
    json={"args": ["-c", "import time; time.sleep(2)"], "timeout": 0.1},
  )

  assert response.status_code == 200
  body = response.json()
  assert body["exit_code"] == 124
  assert body["timed_out"] is True

def test_jwt_claims_become_policy():
  token = jwt({"sub": "file", "vaults": ["work"], "paths": ["Inbox/"], "commands": ["read"]})
  claims = authmod.decode_hs256_jwt(token, b"test-jwt-secret")
  policy = authmod.policy_from_jwt_claims(token, claims)

  assert policy.token == token
  assert policy.name == "file"
  assert policy.vaults == ("work",)
  assert policy.paths == ("Inbox/",)
  assert policy.commands == ("read",)

def test_token_policy_restricts_command(monkeypatch):
  token = use_jwt_auth(monkeypatch, {"sub": "limited", "commands": ["read"], "vaults": ["*"], "paths": ["*"]})

  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {token}"},
    json={"args": ["create", "path=Inbox/Nope.md", "content=Nope"]},
  )

  assert response.status_code == 403
  assert response.json()["detail"] == "token is not allowed to run command: create"

def test_token_policy_restricts_vault(monkeypatch):
  token = use_jwt_auth(monkeypatch, {"sub": "work", "commands": ["*"], "vaults": ["work"], "paths": ["*"]})

  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {token}"},
    json={"args": ["vault=personal", "read", "path=Inbox/Test.md"]},
  )

  assert response.status_code == 403
  assert response.json()["detail"] == "token is not allowed to access vault: personal"

def test_token_policy_restricts_path(monkeypatch):
  token = use_jwt_auth(monkeypatch, {"sub": "inbox", "commands": ["read"], "vaults": ["*"], "paths": ["Inbox/"]})

  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {token}"},
    json={"args": ["read", "path=Private/Secret.md"]},
  )

  assert response.status_code == 403
  assert response.json()["detail"] == "token is not allowed to access path: Private/Secret.md"

def test_token_policy_allows_allowed_path(monkeypatch):
  token = use_jwt_auth(monkeypatch, {"sub": "inbox", "commands": ["read"], "vaults": ["*"], "paths": ["Inbox/"]})

  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {token}"},
    json={"args": ["-c", "print('ok')"]},
  )

  assert response.status_code == 403

  response = client.post(
    "/commands",
    headers={"Authorization": f"Bearer {token}"},
    json={"args": ["read", "path=Inbox/Allowed.md"]},
  )

  # The authorization layer allows this. The fake Python CLI then fails because
  # "read" is not a Python flag, which is fine for this policy test.
  assert response.status_code == 200
  assert response.json()["command"] == ["python", "read", "path=Inbox/Allowed.md"]