"""Email Service (SMTP) 单元测试"""

from __future__ import annotations

from unittest.mock import MagicMock, patch

import pytest

from packages.adapters.smtp.email_service import (
    EmailService,
    NoopEmailService,
    get_email_service,
)
from packages.domain.auth.email_service import EmailConfig


@pytest.fixture
def email_config():
    return EmailConfig(
        smtp_host="smtp.example.com",
        smtp_port=587,
        from_email="noreply@example.com",
        from_name="小虾 SaaS",
        smtp_user="user",
        smtp_password="pass",
        use_tls=True,
    )


@pytest.fixture
def email_service(email_config):
    return EmailService(email_config)


class TestNoopEmailService:
    """NoopEmailService 测试"""

    def test_send_verification_email_returns_false(self):
        """验证邮件返回失败"""
        svc = NoopEmailService()
        success, msg = svc.send_verification_email(
            to_email="test@example.com",
            username="testuser",
            verification_url="https://example.com/verify",
        )
        assert success is False
        assert "disabled" in msg.lower()

    def test_send_password_reset_email_returns_false(self):
        """密码重置邮件返回失败"""
        svc = NoopEmailService()
        success, msg = svc.send_password_reset_email(
            to_email="test@example.com",
            username="testuser",
            reset_url="https://example.com/reset",
        )
        assert success is False
        assert "disabled" in msg.lower()


class TestEmailServiceInit:
    """初始化测试"""

    def test_init_with_config(self, email_config):
        """使用指定配置初始化"""
        svc = EmailService(email_config)
        assert svc.config is email_config

    def test_init_without_config(self):
        """不指定配置使用默认 EmailConfig"""
        svc = EmailService()
        assert svc.config is not None
        assert isinstance(svc.config, EmailConfig)


class TestSendEmail:
    """send_email 方法测试"""

    def test_send_success(self, email_service):
        """发送成功"""
        with patch("packages.adapters.smtp.email_service.smtplib.SMTP") as mock_smtp:
            mock_server = MagicMock()
            mock_smtp.return_value.__enter__.return_value = mock_server

            success, error = email_service.send_email(
                to_email="user@example.com",
                subject="测试主题",
                html_body="<p>测试内容</p>",
            )

            assert success is True
            assert error is None
            mock_server.starttls.assert_called_once()
            mock_server.login.assert_called_once_with("user", "pass")
            mock_server.sendmail.assert_called_once()

    def test_send_without_tls(self, email_config):
        """不使用 TLS"""
        email_config.use_tls = False
        svc = EmailService(email_config)

        with patch("packages.adapters.smtp.email_service.smtplib.SMTP") as mock_smtp:
            mock_server = MagicMock()
            mock_smtp.return_value.__enter__.return_value = mock_server

            svc.send_email(to_email="u@e.com", subject="s", html_body="body")
            mock_server.starttls.assert_not_called()

    def test_send_without_auth(self, email_config):
        """不配置用户名密码时不登录"""
        email_config.smtp_user = ""
        email_config.smtp_password = ""
        svc = EmailService(email_config)

        with patch("packages.adapters.smtp.email_service.smtplib.SMTP") as mock_smtp:
            mock_server = MagicMock()
            mock_smtp.return_value.__enter__.return_value = mock_server

            svc.send_email(to_email="u@e.com", subject="s", html_body="body")
            mock_server.login.assert_not_called()

    def test_send_with_cc_and_bcc(self, email_service):
        """发送带抄送和密送"""
        with patch("packages.adapters.smtp.email_service.smtplib.SMTP") as mock_smtp:
            mock_server = MagicMock()
            mock_smtp.return_value.__enter__.return_value = mock_server

            email_service.send_email(
                to_email="to@example.com",
                subject="s",
                html_body="body",
                cc=["cc1@example.com", "cc2@example.com"],
                bcc=["bcc@example.com"],
            )

            # 验证 recipients 包含所有收件人
            call_args = mock_server.sendmail.call_args
            recipients = call_args[0][1]
            assert "to@example.com" in recipients
            assert "cc1@example.com" in recipients
            assert "cc2@example.com" in recipients
            assert "bcc@example.com" in recipients

    def test_send_with_text_body(self, email_service):
        """带纯文本正文"""
        with patch("packages.adapters.smtp.email_service.smtplib.SMTP") as mock_smtp:
            mock_server = MagicMock()
            mock_smtp.return_value.__enter__.return_value = mock_server

            email_service.send_email(
                to_email="u@e.com",
                subject="s",
                html_body="<p>html</p>",
                text_body="plain text",
            )

            mock_server.sendmail.assert_called_once()

    def test_send_failure_returns_false(self, email_service):
        """发送失败返回 False 和错误信息"""
        with patch("packages.adapters.smtp.email_service.smtplib.SMTP") as mock_smtp:
            mock_server = MagicMock()
            mock_server.sendmail.side_effect = Exception("Connection refused")
            mock_smtp.return_value.__enter__.return_value = mock_server

            success, error = email_service.send_email(to_email="u@e.com", subject="s", html_body="body")

            assert success is False
            assert "Connection refused" in error

    def test_from_header_exists(self, email_service):
        """From 头存在"""
        with patch("packages.adapters.smtp.email_service.smtplib.SMTP") as mock_smtp:
            mock_server = MagicMock()
            mock_smtp.return_value.__enter__.return_value = mock_server

            email_service.send_email(to_email="u@e.com", subject="s", html_body="body")

            call_args = mock_server.sendmail.call_args
            msg_str = call_args[0][2]
            assert "From:" in msg_str
            assert "To: u@e.com" in msg_str


class TestSendVerificationEmail:
    """发送验证邮件测试"""

    def test_verification_email_contains_url(self, email_service):
        """验证邮件包含验证链接"""
        with patch.object(email_service, "send_email", return_value=(True, None)) as mock_send:
            email_service.send_verification_email(
                to_email="user@example.com",
                username="testuser",
                verification_url="https://app.example.com/verify?token=abc123",
            )

            mock_send.assert_called_once()
            call_args = mock_send.call_args
            # 验证主题
            assert "验证" in call_args[0][1]
            # HTML 正文包含用户名和链接
            assert "testuser" in call_args[0][2]
            assert "https://app.example.com/verify?token=abc123" in call_args[0][2]

    def test_verification_email_has_text_body(self, email_service):
        """验证邮件有纯文本版"""
        with patch.object(email_service, "send_email", return_value=(True, None)) as mock_send:
            email_service.send_verification_email(
                to_email="u@e.com",
                username="u",
                verification_url="https://example.com/v",
            )

            call_args = mock_send.call_args
            # 第四个参数是 text_body
            assert call_args[0][3] is not None
            assert len(call_args[0][3]) > 0


class TestSendPasswordResetEmail:
    """发送密码重置邮件测试"""

    def test_reset_email_contains_url(self, email_service):
        """重置邮件包含重置链接"""
        with patch.object(email_service, "send_email", return_value=(True, None)) as mock_send:
            email_service.send_password_reset_email(
                to_email="user@example.com",
                username="testuser",
                reset_url="https://app.example.com/reset?token=xyz",
            )

            mock_send.assert_called_once()
            call_args = mock_send.call_args
            assert "重置" in call_args[0][1]
            assert "testuser" in call_args[0][2]
            assert "https://app.example.com/reset?token=xyz" in call_args[0][2]

    def test_reset_email_has_text_body(self, email_service):
        """重置邮件有纯文本版"""
        with patch.object(email_service, "send_email", return_value=(True, None)) as mock_send:
            email_service.send_password_reset_email(
                to_email="u@e.com",
                username="u",
                reset_url="https://example.com/r",
            )

            call_args = mock_send.call_args
            assert call_args[0][3] is not None
            assert len(call_args[0][3]) > 0


class TestGetEmailService:
    """工厂函数测试"""

    def test_disabled_returns_noop(self):
        """禁用时返回 NoopEmailService"""
        svc = get_email_service(enabled=False)
        assert isinstance(svc, NoopEmailService)

    def test_enabled_returns_email_service(self, email_config):
        """启用时返回 EmailService"""
        svc = get_email_service(config=email_config, enabled=True)
        assert isinstance(svc, EmailService)

    def test_singleton_default(self):
        """默认情况下是单例"""
        svc1 = get_email_service()
        svc2 = get_email_service()
        # 两个都可能是 Noop 或 EmailService，取决于环境
        assert type(svc1) is type(svc2)