from __future__ import annotations

import json
import shutil
from pathlib import Path

from nexus_claude_api.cli import main
from nexus_claude_api.config import (
    Settings,
    load_local_config,
    load_user_config,
    write_user_config,
)
from nexus_claude_api.shell import generate_claude_code_powershell


def test_claude_code_command() -> None:
    settings = Settings.from_values(
        host="127.0.0.1",
        port=4141,
        api_key="test",
        require_api_key=False,
    )

    command = generate_claude_code_powershell(settings)

    assert "ANTHROPIC_BASE_URL" in command
    assert "ANTHROPIC_AUTH_TOKEN='dummy'" in command
    assert "CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY='1'" in command
    assert "claude-opus-4.6" in command
    assert command.endswith("claude --model claude-opus-4.6")


def test_claude_code_command_uses_custom_model() -> None:
    settings = Settings.from_values(
        host="127.0.0.1",
        port=4141,
        api_key="test",
        model="claude-opus-4.6",
        require_api_key=False,
    )

    command = generate_claude_code_powershell(settings)

    assert command.endswith("claude --model claude-opus-4.6")


def test_missing_api_key_fails(monkeypatch) -> None:
    tmp_path = _workspace_tmp("missing-key")
    user_config = tmp_path / ".config" / "nexus-claude-api" / "config.json"
    monkeypatch.setattr("nexus_claude_api.config.USER_CONFIG_FILE", user_config)
    monkeypatch.delenv("NEXUS_API_KEY", raising=False)
    monkeypatch.delenv("AWS_BEARER_TOKEN_BEDROCK", raising=False)
    monkeypatch.chdir(tmp_path)

    try:
        exit_code = main(["start", "--dry-run"])
    finally:
        monkeypatch.chdir(Path(__file__).parents[1])
        shutil.rmtree(tmp_path, ignore_errors=True)

    assert exit_code == 2


def test_user_config_api_key(monkeypatch) -> None:
    tmp_path = _workspace_tmp("user-config")
    user_config = tmp_path / ".config" / "nexus-claude-api" / "config.json"
    monkeypatch.setattr("nexus_claude_api.config.USER_CONFIG_FILE", user_config)
    write_user_config({"api_key": "user-test-key"})

    settings = Settings.from_values(require_api_key=False)

    assert settings.api_key == "user-test-key"
    assert load_user_config()["api_key"] == "user-test-key"
    shutil.rmtree(tmp_path, ignore_errors=True)


def test_dev_local_config_api_key(monkeypatch) -> None:
    tmp_path = _workspace_tmp("dev-local-config")
    monkeypatch.chdir(tmp_path)
    (tmp_path / "nexus-claude-api.local.json").write_text(
        '{"api_key": "local-test-key"}',
        encoding="utf-8",
    )

    try:
        settings = Settings.from_values(require_api_key=False, dev=True)

        assert settings.api_key == "local-test-key"
        assert load_local_config()["api_key"] == "local-test-key"
    finally:
        monkeypatch.chdir(Path(__file__).parents[1])
        shutil.rmtree(tmp_path, ignore_errors=True)


def test_default_mode_ignores_local_config(monkeypatch) -> None:
    tmp_path = _workspace_tmp("default-ignores-local")
    user_config = tmp_path / ".config" / "nexus-claude-api" / "config.json"
    monkeypatch.setattr("nexus_claude_api.config.USER_CONFIG_FILE", user_config)
    monkeypatch.delenv("NEXUS_API_KEY", raising=False)
    monkeypatch.delenv("AWS_BEARER_TOKEN_BEDROCK", raising=False)
    monkeypatch.chdir(tmp_path)
    (tmp_path / "nexus-claude-api.local.json").write_text(
        '{"api_key": "local-test-key"}',
        encoding="utf-8",
    )

    try:
        settings = Settings.from_values(require_api_key=False)

        assert settings.api_key is None
    finally:
        monkeypatch.chdir(Path(__file__).parents[1])
        shutil.rmtree(tmp_path, ignore_errors=True)


def test_api_key_precedence_config_before_environment(monkeypatch) -> None:
    tmp_path = _workspace_tmp("config-precedence")
    user_config = tmp_path / ".config" / "nexus-claude-api" / "config.json"
    monkeypatch.setattr("nexus_claude_api.config.USER_CONFIG_FILE", user_config)
    monkeypatch.setenv("NEXUS_API_KEY", "env-key")
    write_user_config({"api_key": "config-key"})

    settings = Settings.from_values(require_api_key=False)

    assert settings.api_key == "config-key"
    shutil.rmtree(tmp_path, ignore_errors=True)


def test_api_key_argument_overrides_config(monkeypatch) -> None:
    tmp_path = _workspace_tmp("arg-precedence")
    user_config = tmp_path / ".config" / "nexus-claude-api" / "config.json"
    monkeypatch.setattr("nexus_claude_api.config.USER_CONFIG_FILE", user_config)
    write_user_config({"api_key": "config-key"})

    settings = Settings.from_values(api_key="arg-key", require_api_key=False)

    assert settings.api_key == "arg-key"
    shutil.rmtree(tmp_path, ignore_errors=True)


def test_config_set_writes_user_config(monkeypatch) -> None:
    tmp_path = _workspace_tmp("config-set")
    user_config = tmp_path / ".config" / "nexus-claude-api" / "config.json"
    monkeypatch.setattr("nexus_claude_api.config.USER_CONFIG_FILE", user_config)

    exit_code = main(["config", "set", "--api-key", "written-key"])

    assert exit_code == 0
    assert json.loads(user_config.read_text(encoding="utf-8")) == {
        "api_key": "written-key"
    }
    shutil.rmtree(tmp_path, ignore_errors=True)


def _workspace_tmp(name: str) -> Path:
    path = Path(__file__).parents[1] / ".test-tmp" / name
    shutil.rmtree(path, ignore_errors=True)
    path.mkdir(parents=True, exist_ok=True)
    return path