from __future__ import annotations

import json
from unittest.mock import MagicMock, patch

import pytest

from mcp_common.app_factory import ExchangeAppSpec, run_exchange_main
from mcp_common.environment import EnvironmentInfo


def _make_spec(build_client=None, build_app=None) -> ExchangeAppSpec:
    return ExchangeAppSpec(
        exchange="testex",
        creds_env_var="TESTEX_CREDENTIALS_FILE",
        env_var="TESTEX_TESTNET",
        flag_key="testnet",
        default_base_url_live="https://api.testex.com",
        default_base_url_testnet="https://test.testex.com",
        default_port=9999,
        build_client=build_client or (lambda creds, env_info: MagicMock(name="client")),
        build_app=build_app or (lambda **kwargs: MagicMock(name="app")),
    )


def test_run_exchange_main_loads_creds_and_resolves_env(tmp_path, monkeypatch):
    creds_file = tmp_path / "creds.json"
    creds_file.write_text(json.dumps({"api_key": "k", "api_secret": "s"}))
    monkeypatch.setenv("TESTEX_CREDENTIALS_FILE", str(creds_file))
    monkeypatch.setenv("PORT", "10000")
    monkeypatch.delenv("TESTEX_TESTNET", raising=False)

    captured: dict = {}

    def build_client(creds, env_info):
        captured["creds"] = creds
        captured["env_info"] = env_info
        return MagicMock()

    def build_app(**kwargs):
        captured["app_kwargs"] = kwargs
        return MagicMock()

    spec = _make_spec(build_client=build_client, build_app=build_app)

    with patch("mcp_common.app_factory.uvicorn.run") as mock_run:
        run_exchange_main(spec)

    assert captured["creds"]["api_key"] == "k"
    assert captured["creds"]["base_url_live"] == "https://api.testex.com"
    assert captured["creds"]["base_url_testnet"] == "https://test.testex.com"
    assert isinstance(captured["env_info"], EnvironmentInfo)
    assert captured["env_info"].environment == "testnet"
    assert captured["env_info"].exchange == "testex"

    assert "client" in captured["app_kwargs"]
    assert "token_store" in captured["app_kwargs"]
    assert "creds" in captured["app_kwargs"]
    assert "env_info" in captured["app_kwargs"]

    call_kwargs = mock_run.call_args.kwargs
    assert call_kwargs["port"] == 10000  # PORT override


def test_run_exchange_main_uses_default_port(tmp_path, monkeypatch):
    creds_file = tmp_path / "creds.json"
    creds_file.write_text(json.dumps({}))
    monkeypatch.setenv("TESTEX_CREDENTIALS_FILE", str(creds_file))
    monkeypatch.delenv("PORT", raising=False)

    spec = _make_spec()
    with patch("mcp_common.app_factory.uvicorn.run") as mock_run:
        run_exchange_main(spec)

    assert mock_run.call_args.kwargs["port"] == 9999


def test_run_exchange_main_env_var_overrides_creds(tmp_path, monkeypatch):
    creds_file = tmp_path / "creds.json"
    # `environment: mainnet` esplicito perché env var override → mainnet
    # e consistency_check richiede conferma per evitare switch accidentale.
    creds_file.write_text(json.dumps({"testnet": True, "environment": "mainnet"}))
    monkeypatch.setenv("TESTEX_CREDENTIALS_FILE", str(creds_file))
    monkeypatch.setenv("TESTEX_TESTNET", "false")

    captured: dict = {}

    def build_client(creds, env_info):
        captured["env_info"] = env_info
        return MagicMock()

    spec = _make_spec(build_client=build_client)

    with patch("mcp_common.app_factory.uvicorn.run"):
        run_exchange_main(spec)

    # env var "false" overrides creds.testnet=True → mainnet
    assert captured["env_info"].environment == "mainnet"
    assert captured["env_info"].source == "env"


def test_run_exchange_main_aborts_on_mainnet_without_confirmation(tmp_path, monkeypatch):
    """Mainnet senza creds['environment']='mainnet' → boot abort fail-fast."""
    from mcp_common.environment import EnvironmentMismatchError
    creds_file = tmp_path / "creds.json"
    creds_file.write_text(json.dumps({"testnet": False}))
    monkeypatch.setenv("TESTEX_CREDENTIALS_FILE", str(creds_file))
    monkeypatch.delenv("TESTEX_TESTNET", raising=False)
    monkeypatch.delenv("STRICT_MAINNET", raising=False)

    spec = _make_spec()
    with pytest.raises(EnvironmentMismatchError):
        with patch("mcp_common.app_factory.uvicorn.run"):
            run_exchange_main(spec)


def test_run_exchange_main_strict_mainnet_disabled_via_env(tmp_path, monkeypatch):
    """STRICT_MAINNET=false permette mainnet senza conferma (warning soltanto)."""
    creds_file = tmp_path / "creds.json"
    creds_file.write_text(json.dumps({"testnet": False}))
    monkeypatch.setenv("TESTEX_CREDENTIALS_FILE", str(creds_file))
    monkeypatch.setenv("STRICT_MAINNET", "false")

    spec = _make_spec()
    with patch("mcp_common.app_factory.uvicorn.run"):
        run_exchange_main(spec)  # non solleva


def test_run_exchange_main_missing_creds_file_exits(monkeypatch):
    monkeypatch.delenv("TESTEX_CREDENTIALS_FILE", raising=False)

    spec = _make_spec()
    import pytest
    with pytest.raises(SystemExit) as exc_info:
        run_exchange_main(spec)
    assert exc_info.value.code == 2