"""视频分享 UseCase 单元测试."""

from __future__ import annotations

from datetime import datetime, timedelta, timezone
from unittest.mock import MagicMock

import pytest

from packages.application.video_share.commands import (
    CreateShareCommand,
    UpdateShareCommand,
)
from packages.application.video_share.use_cases import (
    AccessShareUseCase,
    CreateShareUseCase,
    GetShareByTokenUseCase,
    InvalidPasswordError,
    ListSharesByUserUseCase,
    ListSharesByVideoUseCase,
    NotFoundError,
    PasswordRequiredError,
    RecordShareDownloadUseCase,
    RevokeShareUseCase,
    ShareExpiredError,
    UpdateShareUseCase,
    VideoNotFoundError,
)
from packages.domain.generated_video import GeneratedVideo
from packages.domain.video_share import VideoShare


@pytest.fixture
def mock_share_repo():
    return MagicMock()


@pytest.fixture
def mock_video_repo():
    return MagicMock()


@pytest.fixture
def sample_video():
    video = MagicMock(spec=GeneratedVideo)
    video.id = "video_001"
    video.user_id = "user_001"
    return video


@pytest.fixture
def sample_share():
    share = VideoShare.create(
        video_id="video_001",
        user_id="user_001",
    )
    return share


@pytest.fixture
def sample_share_with_password():
    share = VideoShare.create(
        video_id="video_001",
        user_id="user_001",
        password="secret123",
    )
    return share


@pytest.fixture
def sample_share_expired():
    # 直接构造已过期的分享（不经过create方法的校验）
    share = VideoShare(
        id="share_expired_001",
        video_id="video_001",
        user_id="user_001",
        share_token="expiredtoken123",
        expires_at=datetime.now(timezone.utc) - timedelta(hours=1),
    )
    return share


class TestCreateShareUseCase:
    """CreateShareUseCase 测试"""

    def test_create_share_success(self, mock_share_repo, mock_video_repo, sample_video):
        """正常创建分享链接"""
        mock_video_repo.get.return_value = sample_video
        mock_share_repo.create.side_effect = lambda s: s

        use_case = CreateShareUseCase(mock_share_repo, mock_video_repo)
        command = CreateShareCommand(video_id="video_001", user_id="user_001")
        result = use_case.execute(command)

        assert result.video_id == "video_001"
        assert result.user_id == "user_001"
        assert result.share_token is not None
        assert result.has_password is False
        mock_share_repo.create.assert_called_once()

    def test_create_share_with_password(self, mock_share_repo, mock_video_repo, sample_video):
        """创建带密码的分享"""
        mock_video_repo.get.return_value = sample_video
        mock_share_repo.create.side_effect = lambda s: s

        use_case = CreateShareUseCase(mock_share_repo, mock_video_repo)
        command = CreateShareCommand(
            video_id="video_001",
            user_id="user_001",
            password="mypassword",
        )
        result = use_case.execute(command)

        assert result.has_password is True
        assert result.password_hash is not None

    def test_create_share_with_expiry(self, mock_share_repo, mock_video_repo, sample_video):
        """创建带有效期的分享"""
        mock_video_repo.get.return_value = sample_video
        mock_share_repo.create.side_effect = lambda s: s

        future = datetime.now(timezone.utc) + timedelta(days=7)
        use_case = CreateShareUseCase(mock_share_repo, mock_video_repo)
        command = CreateShareCommand(
            video_id="video_001",
            user_id="user_001",
            expires_at=future,
        )
        result = use_case.execute(command)

        assert result.expires_at == future

    def test_create_share_video_not_found(self, mock_share_repo, mock_video_repo):
        """视频不存在时抛出 VideoNotFoundError"""
        mock_video_repo.get.return_value = None

        use_case = CreateShareUseCase(mock_share_repo, mock_video_repo)
        command = CreateShareCommand(video_id="nonexistent", user_id="user_001")

        with pytest.raises(VideoNotFoundError):
            use_case.execute(command)

        mock_share_repo.create.assert_not_called()

    def test_create_share_wrong_user(self, mock_share_repo, mock_video_repo, sample_video):
        """非视频所有者创建分享失败"""
        sample_video.user_id = "user_other"
        mock_video_repo.get.return_value = sample_video

        use_case = CreateShareUseCase(mock_share_repo, mock_video_repo)
        command = CreateShareCommand(video_id="video_001", user_id="user_001")

        with pytest.raises(VideoNotFoundError):
            use_case.execute(command)

        mock_share_repo.create.assert_not_called()


class TestGetShareByTokenUseCase:
    """GetShareByTokenUseCase 测试"""

    def test_get_share_success(self, mock_share_repo, sample_share):
        """通过 token 正常获取分享信息"""
        mock_share_repo.get_by_token.return_value = sample_share

        use_case = GetShareByTokenUseCase(mock_share_repo)
        result = use_case.execute(sample_share.share_token)

        assert result.id == sample_share.id
        mock_share_repo.get_by_token.assert_called_once_with(sample_share.share_token)

    def test_get_share_not_found(self, mock_share_repo):
        """token 不存在时抛出 NotFoundError"""
        mock_share_repo.get_by_token.return_value = None

        use_case = GetShareByTokenUseCase(mock_share_repo)

        with pytest.raises(NotFoundError):
            use_case.execute("invalid_token")

    def test_get_share_expired_raises(self, mock_share_repo, sample_share_expired):
        """已过期的分享不可访问"""
        mock_share_repo.get_by_token.return_value = sample_share_expired

        use_case = GetShareByTokenUseCase(mock_share_repo)

        with pytest.raises(ShareExpiredError):
            use_case.execute(sample_share_expired.share_token)


class TestAccessShareUseCase:
    """AccessShareUseCase 测试"""

    def test_access_without_password(self, mock_share_repo, mock_video_repo, sample_share, sample_video):
        """无密码分享直接访问成功"""
        mock_share_repo.get_by_token.return_value = sample_share
        mock_video_repo.get.return_value = sample_video

        use_case = AccessShareUseCase(mock_share_repo, mock_video_repo)
        result = use_case.execute(sample_share.share_token)

        assert result.share.id == sample_share.id
        assert result.video.id == "video_001"
        assert result.password_verified is True
        mock_share_repo.increment_view.assert_called_once_with(sample_share.id)
        assert sample_share.view_count == 1

    def test_access_with_correct_password(
        self, mock_share_repo, mock_video_repo, sample_share_with_password, sample_video
    ):
        """带密码分享输入正确密码访问成功"""
        mock_share_repo.get_by_token.return_value = sample_share_with_password
        mock_video_repo.get.return_value = sample_video

        use_case = AccessShareUseCase(mock_share_repo, mock_video_repo)
        result = use_case.execute(sample_share_with_password.share_token, password="secret123")

        assert result.password_verified is True
        mock_share_repo.increment_view.assert_called_once()

    def test_access_password_required_but_not_provided(
        self, mock_share_repo, mock_video_repo, sample_share_with_password
    ):
        """带密码分享不输入密码抛出 PasswordRequiredError"""
        mock_share_repo.get_by_token.return_value = sample_share_with_password

        use_case = AccessShareUseCase(mock_share_repo, mock_video_repo)

        with pytest.raises(PasswordRequiredError):
            use_case.execute(sample_share_with_password.share_token)

        mock_share_repo.increment_view.assert_not_called()

    def test_access_wrong_password(self, mock_share_repo, mock_video_repo, sample_share_with_password):
        """密码错误抛出 InvalidPasswordError"""
        mock_share_repo.get_by_token.return_value = sample_share_with_password

        use_case = AccessShareUseCase(mock_share_repo, mock_video_repo)

        with pytest.raises(InvalidPasswordError):
            use_case.execute(sample_share_with_password.share_token, password="wrongpass")

        mock_share_repo.increment_view.assert_not_called()

    def test_access_share_not_found(self, mock_share_repo, mock_video_repo):
        """分享不存在抛出 NotFoundError"""
        mock_share_repo.get_by_token.return_value = None

        use_case = AccessShareUseCase(mock_share_repo, mock_video_repo)

        with pytest.raises(NotFoundError):
            use_case.execute("invalid_token")

    def test_access_expired_share(self, mock_share_repo, mock_video_repo, sample_share_expired):
        """已过期分享不可访问"""
        mock_share_repo.get_by_token.return_value = sample_share_expired

        use_case = AccessShareUseCase(mock_share_repo, mock_video_repo)

        with pytest.raises(ShareExpiredError):
            use_case.execute(sample_share_expired.share_token)

        mock_share_repo.increment_view.assert_not_called()

    def test_access_video_not_found(self, mock_share_repo, mock_video_repo, sample_share):
        """分享存在但视频不存在"""
        mock_share_repo.get_by_token.return_value = sample_share
        mock_video_repo.get.return_value = None

        use_case = AccessShareUseCase(mock_share_repo, mock_video_repo)

        with pytest.raises(VideoNotFoundError):
            use_case.execute(sample_share.share_token)


class TestListSharesByVideoUseCase:
    """ListSharesByVideoUseCase 测试"""

    def test_list_by_video(self, mock_share_repo, sample_share):
        """列出某个视频的所有分享"""
        mock_share_repo.list_by_video.return_value = [sample_share]

        use_case = ListSharesByVideoUseCase(mock_share_repo)
        result = use_case.execute("video_001", "user_001")

        assert len(result) == 1
        mock_share_repo.list_by_video.assert_called_once_with("video_001", "user_001")

    def test_list_by_video_empty(self, mock_share_repo):
        """视频没有分享记录时返回空列表"""
        mock_share_repo.list_by_video.return_value = []

        use_case = ListSharesByVideoUseCase(mock_share_repo)
        result = use_case.execute("video_001", "user_001")

        assert result == []


class TestListSharesByUserUseCase:
    """ListSharesByUserUseCase 测试"""

    def test_list_by_user(self, mock_share_repo, sample_share):
        """列出用户的所有分享"""
        mock_share_repo.list_by_user.return_value = [sample_share]
        mock_share_repo.count_by_user.return_value = 1

        use_case = ListSharesByUserUseCase(mock_share_repo)
        items, total = use_case.execute("user_001")

        assert len(items) == 1
        assert total == 1
        mock_share_repo.list_by_user.assert_called_once_with("user_001", skip=0, limit=20)

    def test_list_by_user_with_pagination(self, mock_share_repo):
        """带分页参数查询"""
        mock_share_repo.list_by_user.return_value = []
        mock_share_repo.count_by_user.return_value = 50

        use_case = ListSharesByUserUseCase(mock_share_repo)
        items, total = use_case.execute("user_001", skip=10, limit=5)

        assert total == 50
        mock_share_repo.list_by_user.assert_called_once_with("user_001", skip=10, limit=5)

    def test_list_by_user_empty(self, mock_share_repo):
        """用户没有分享记录"""
        mock_share_repo.list_by_user.return_value = []
        mock_share_repo.count_by_user.return_value = 0

        use_case = ListSharesByUserUseCase(mock_share_repo)
        items, total = use_case.execute("user_001")

        assert items == []
        assert total == 0


class TestUpdateShareUseCase:
    """UpdateShareUseCase 测试"""

    def test_update_password(self, mock_share_repo, sample_share):
        """更新分享密码"""
        mock_share_repo.get_by_id.return_value = sample_share
        mock_share_repo.update.side_effect = lambda s: s

        use_case = UpdateShareUseCase(mock_share_repo)
        command = UpdateShareCommand(
            share_id=sample_share.id,
            user_id="user_001",
            password="newpassword",
        )
        result = use_case.execute(command)

        assert result.has_password is True
        mock_share_repo.update.assert_called_once()

    def test_clear_password(self, mock_share_repo, sample_share_with_password):
        """清除分享密码（空字符串）"""
        mock_share_repo.get_by_id.return_value = sample_share_with_password
        mock_share_repo.update.side_effect = lambda s: s

        use_case = UpdateShareUseCase(mock_share_repo)
        command = UpdateShareCommand(
            share_id=sample_share_with_password.id,
            user_id="user_001",
            password="",  # 空字符串表示清除
        )
        result = use_case.execute(command)

        assert result.has_password is False
        assert result.password_hash is None

    def test_update_password_none_no_change(self, mock_share_repo, sample_share_with_password):
        """password=None 不修改密码"""
        original_hash = sample_share_with_password.password_hash
        mock_share_repo.get_by_id.return_value = sample_share_with_password
        mock_share_repo.update.side_effect = lambda s: s

        use_case = UpdateShareUseCase(mock_share_repo)
        command = UpdateShareCommand(
            share_id=sample_share_with_password.id,
            user_id="user_001",
            password=None,  # None表示不修改
        )
        result = use_case.execute(command)

        assert result.password_hash == original_hash

    def test_update_expires_at(self, mock_share_repo, sample_share):
        """更新有效期"""
        mock_share_repo.get_by_id.return_value = sample_share
        mock_share_repo.update.side_effect = lambda s: s

        future = datetime.now(timezone.utc) + timedelta(days=3)
        use_case = UpdateShareUseCase(mock_share_repo)
        command = UpdateShareCommand(
            share_id=sample_share.id,
            user_id="user_001",
            expires_at=future,
        )
        result = use_case.execute(command)

        assert result.expires_at == future

    def test_update_expires_at_past_raises(self, mock_share_repo, sample_share):
        """设置过去的有效期抛出 ValueError"""
        mock_share_repo.get_by_id.return_value = sample_share

        past = datetime.now(timezone.utc) - timedelta(hours=1)
        use_case = UpdateShareUseCase(mock_share_repo)
        command = UpdateShareCommand(
            share_id=sample_share.id,
            user_id="user_001",
            expires_at=past,
        )

        with pytest.raises(ValueError, match="expires_at cannot be in the past"):
            use_case.execute(command)

        mock_share_repo.update.assert_not_called()

    def test_update_share_not_found(self, mock_share_repo):
        """分享不存在抛出 NotFoundError"""
        mock_share_repo.get_by_id.return_value = None

        use_case = UpdateShareUseCase(mock_share_repo)
        command = UpdateShareCommand(
            share_id="nonexistent",
            user_id="user_001",
            password="newpass",
        )

        with pytest.raises(NotFoundError):
            use_case.execute(command)

        mock_share_repo.update.assert_not_called()


class TestRevokeShareUseCase:
    """RevokeShareUseCase 测试"""

    def test_revoke_success(self, mock_share_repo, sample_share):
        """撤销分享成功"""
        mock_share_repo.get_by_id.return_value = sample_share
        mock_share_repo.delete.return_value = True

        use_case = RevokeShareUseCase(mock_share_repo)
        result = use_case.execute(sample_share.id, "user_001")

        assert result is True
        mock_share_repo.delete.assert_called_once_with(sample_share.id, "user_001")

    def test_revoke_not_found(self, mock_share_repo):
        """分享不存在抛出 NotFoundError"""
        mock_share_repo.get_by_id.return_value = None

        use_case = RevokeShareUseCase(mock_share_repo)

        with pytest.raises(NotFoundError):
            use_case.execute("nonexistent", "user_001")

        mock_share_repo.delete.assert_not_called()


class TestRecordShareDownloadUseCase:
    """RecordShareDownloadUseCase 测试"""

    def test_record_download_no_password(self, mock_share_repo, sample_share):
        """无密码分享记录下载"""
        mock_share_repo.get_by_token.return_value = sample_share

        use_case = RecordShareDownloadUseCase(mock_share_repo)
        use_case.execute(sample_share.share_token)

        mock_share_repo.increment_download.assert_called_once_with(sample_share.id)

    def test_record_download_with_password(self, mock_share_repo, sample_share_with_password):
        """带密码分享正确密码记录下载"""
        mock_share_repo.get_by_token.return_value = sample_share_with_password

        use_case = RecordShareDownloadUseCase(mock_share_repo)
        use_case.execute(sample_share_with_password.share_token, password="secret123")

        mock_share_repo.increment_download.assert_called_once()

    def test_record_download_wrong_password(self, mock_share_repo, sample_share_with_password):
        """密码错误不记录下载"""
        mock_share_repo.get_by_token.return_value = sample_share_with_password

        use_case = RecordShareDownloadUseCase(mock_share_repo)

        with pytest.raises(InvalidPasswordError):
            use_case.execute(sample_share_with_password.share_token, password="wrong")

        mock_share_repo.increment_download.assert_not_called()

    def test_record_download_not_found(self, mock_share_repo):
        """分享不存在抛出 NotFoundError"""
        mock_share_repo.get_by_token.return_value = None

        use_case = RecordShareDownloadUseCase(mock_share_repo)

        with pytest.raises(NotFoundError):
            use_case.execute("invalid_token")

    def test_record_download_expired(self, mock_share_repo, sample_share_expired):
        """已过期分享不能下载"""
        mock_share_repo.get_by_token.return_value = sample_share_expired

        use_case = RecordShareDownloadUseCase(mock_share_repo)

        with pytest.raises(ShareExpiredError):
            use_case.execute(sample_share_expired.share_token)

        mock_share_repo.increment_download.assert_not_called()