"""视频分享 - 领域实体 + Use cases 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,
    ShareAccessResult,
    ShareExpiredError,
    UpdateShareUseCase,
    VideoNotFoundError,
)
from packages.domain.generated_video import GeneratedVideo
from packages.domain.video_share import (
    VideoShare,
    _hash_password,
    generate_share_token,
)


def _make_share(
    share_id: str = "share_001",
    video_id: str = "vid_001",
    user_id: str = "user_001",
    token: str = "abc123xyz",
    password: str | None = None,
    expires_at: datetime | None = None,
    is_active: bool = True,
) -> VideoShare:
    return VideoShare(
        id=share_id,
        video_id=video_id,
        user_id=user_id,
        share_token=token,
        password_hash=_hash_password(password) if password else None,
        expires_at=expires_at,
        view_count=0,
        download_count=0,
        is_active=is_active,
        created_at=datetime.now(timezone.utc),
        updated_at=datetime.now(timezone.utc),
    )


def _make_video(video_id: str = "vid_001", user_id: str = "user_001") -> GeneratedVideo:
    return GeneratedVideo(
        id=video_id,
        project_id="proj_001",
        generation_task_id="task_001",
        name="测试视频",
        file_url="oss://bucket/video.mp4",
        file_size=1024000,
        duration=30.5,
        width=1080,
        height=1920,
        fps=30.0,
        user_id=user_id,
    )


class TestVideoShareDomain:
    def test_generate_token_length(self) -> None:
        token = generate_share_token(12)
        assert len(token) == 12

    def test_generate_token_url_safe(self) -> None:
        token = generate_share_token(16)
        # 只包含字母数字，没有特殊字符
        assert token.isalnum()

    def test_hash_password_consistent(self) -> None:
        h1 = _hash_password("mypassword")
        h2 = _hash_password("mypassword")
        assert h1 == h2
        assert len(h1) == 64  # sha256 hex

    def test_hash_password_different_for_different_passwords(self) -> None:
        h1 = _hash_password("password1")
        h2 = _hash_password("password2")
        assert h1 != h2

    def test_hash_empty_password(self) -> None:
        assert _hash_password("") == ""

    def test_create_share_success(self) -> None:
        share = VideoShare.create(
            video_id="vid_001",
            user_id="user_001",
        )
        assert share.video_id == "vid_001"
        assert share.user_id == "user_001"
        assert len(share.id) == 32
        assert len(share.share_token) == 12
        assert share.password_hash is None
        assert share.expires_at is None
        assert share.is_active is True
        assert share.view_count == 0
        assert share.download_count == 0

    def test_create_share_with_password(self) -> None:
        share = VideoShare.create(
            video_id="vid_001",
            user_id="user_001",
            password="secret123",
        )
        assert share.has_password is True
        assert share.verify_password("secret123") is True
        assert share.verify_password("wrong") is False

    def test_create_share_with_expiry(self) -> None:
        future = datetime.now(timezone.utc) + timedelta(days=7)
        share = VideoShare.create(
            video_id="vid_001",
            user_id="user_001",
            expires_at=future,
        )
        assert share.expires_at == future
        assert share.is_expired is False

    def test_create_share_past_expiry_raises(self) -> None:
        past = datetime.now(timezone.utc) - timedelta(days=1)
        with pytest.raises(ValueError, match="past"):
            VideoShare.create(
                video_id="vid_001",
                user_id="user_001",
                expires_at=past,
            )

    def test_create_share_empty_video_id_raises(self) -> None:
        with pytest.raises(ValueError, match="video_id"):
            VideoShare.create(video_id="", user_id="user_001")

    def test_create_share_empty_user_id_raises(self) -> None:
        with pytest.raises(ValueError, match="user_id"):
            VideoShare.create(video_id="vid_001", user_id="  ")

    def test_is_expired_false_when_no_expiry(self) -> None:
        share = _make_share()
        assert share.is_expired is False

    def test_is_expired_true_when_past(self) -> None:
        past = datetime.now(timezone.utc) - timedelta(hours=1)
        share = _make_share(expires_at=past)
        assert share.is_expired is True

    def test_is_accessible_active_not_expired(self) -> None:
        share = _make_share()
        assert share.is_accessible is True

    def test_is_accessible_inactive(self) -> None:
        share = _make_share(is_active=False)
        assert share.is_accessible is False

    def test_is_accessible_expired(self) -> None:
        past = datetime.now(timezone.utc) - timedelta(hours=1)
        share = _make_share(expires_at=past)
        assert share.is_accessible is False

    def test_has_password_false_when_no_password(self) -> None:
        share = _make_share()
        assert share.has_password is False

    def test_has_password_true_when_password_set(self) -> None:
        share = _make_share(password="pass123")
        assert share.has_password is True

    def test_verify_no_password_always_true(self) -> None:
        share = _make_share()  # 没有密码
        assert share.verify_password("") is True
        assert share.verify_password("anything") is True

    def test_verify_correct_password(self) -> None:
        share = _make_share(password="mysecret")
        assert share.verify_password("mysecret") is True

    def test_verify_wrong_password(self) -> None:
        share = _make_share(password="mysecret")
        assert share.verify_password("wrong") is False

    def test_verify_empty_password_with_password_set(self) -> None:
        share = _make_share(password="mysecret")
        assert share.verify_password("") is False

    def test_increment_view_count(self) -> None:
        share = _make_share()
        share.increment_view_count()
        assert share.view_count == 1
        share.increment_view_count()
        assert share.view_count == 2

    def test_increment_download_count(self) -> None:
        share = _make_share()
        share.increment_download_count()
        assert share.download_count == 1

    def test_revoke_sets_inactive(self) -> None:
        share = _make_share()
        share.revoke()
        assert share.is_active is False
        assert share.is_accessible is False


class TestCreateShareUseCase:
    def test_create_success(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        video_repo.get.return_value = _make_video()
        share_repo.create.side_effect = lambda s: s

        use_case = CreateShareUseCase(share_repo, video_repo)
        cmd = CreateShareCommand(video_id="vid_001", user_id="user_001")
        result = use_case.execute(cmd)

        assert result.video_id == "vid_001"
        assert result.user_id == "user_001"
        share_repo.create.assert_called_once()

    def test_create_with_password(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        video_repo.get.return_value = _make_video()
        share_repo.create.side_effect = lambda s: s

        use_case = CreateShareUseCase(share_repo, video_repo)
        cmd = CreateShareCommand(
            video_id="vid_001",
            user_id="user_001",
            password="secret",
        )
        result = use_case.execute(cmd)

        assert result.has_password is True

    def test_create_with_expiry(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        video_repo.get.return_value = _make_video()
        share_repo.create.side_effect = lambda s: s

        use_case = CreateShareUseCase(share_repo, video_repo)
        future = datetime.now(timezone.utc) + timedelta(days=1)
        cmd = CreateShareCommand(
            video_id="vid_001",
            user_id="user_001",
            expires_at=future,
        )
        result = use_case.execute(cmd)

        assert result.expires_at == future

    def test_video_not_found_raises(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        video_repo.get.return_value = None

        use_case = CreateShareUseCase(share_repo, video_repo)
        cmd = CreateShareCommand(video_id="nonexistent", user_id="user_001")

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

    def test_wrong_user_cannot_share(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        video_repo.get.return_value = _make_video(user_id="other_user")

        use_case = CreateShareUseCase(share_repo, video_repo)
        cmd = CreateShareCommand(video_id="vid_001", user_id="user_001")

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


class TestGetShareByTokenUseCase:
    def test_found_active_share(self) -> None:
        repo = MagicMock()
        repo.get_by_token.return_value = _make_share()

        use_case = GetShareByTokenUseCase(repo)
        result = use_case.execute("abc123xyz")
        assert result.share_token == "abc123xyz"

    def test_not_found_raises(self) -> None:
        repo = MagicMock()
        repo.get_by_token.return_value = None

        use_case = GetShareByTokenUseCase(repo)
        with pytest.raises(NotFoundError):
            use_case.execute("nonexistent")

    def test_inactive_share_raises_expired(self) -> None:
        repo = MagicMock()
        repo.get_by_token.return_value = _make_share(is_active=False)

        use_case = GetShareByTokenUseCase(repo)
        with pytest.raises(ShareExpiredError):
            use_case.execute("token")

    def test_expired_share_raises(self) -> None:
        repo = MagicMock()
        past = datetime.now(timezone.utc) - timedelta(days=1)
        repo.get_by_token.return_value = _make_share(expires_at=past)

        use_case = GetShareByTokenUseCase(repo)
        with pytest.raises(ShareExpiredError):
            use_case.execute("token")


class TestAccessShareUseCase:
    def test_access_no_password(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        share_repo.get_by_token.return_value = _make_share()
        video_repo.get.return_value = _make_video()
        share_repo.increment_view.return_value = None

        use_case = AccessShareUseCase(share_repo, video_repo)
        result = use_case.execute("abc123xyz")

        assert isinstance(result, ShareAccessResult)
        assert result.video.id == "vid_001"
        assert result.password_verified is True
        assert result.share.view_count == 1  # 浏览量+1
        share_repo.increment_view.assert_called_once()

    def test_access_with_correct_password(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        share_repo.get_by_token.return_value = _make_share(password="mypass")
        video_repo.get.return_value = _make_video()
        share_repo.increment_view.return_value = None

        use_case = AccessShareUseCase(share_repo, video_repo)
        result = use_case.execute("token", password="mypass")

        assert result.password_verified is True

    def test_access_password_required_but_not_provided(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        share_repo.get_by_token.return_value = _make_share(password="secret")
        video_repo.get.return_value = _make_video()

        use_case = AccessShareUseCase(share_repo, video_repo)

        with pytest.raises(PasswordRequiredError):
            use_case.execute("token", password=None)

    def test_access_wrong_password(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        share_repo.get_by_token.return_value = _make_share(password="correct")
        video_repo.get.return_value = _make_video()

        use_case = AccessShareUseCase(share_repo, video_repo)

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

    def test_access_share_not_found(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        share_repo.get_by_token.return_value = None

        use_case = AccessShareUseCase(share_repo, video_repo)

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

    def test_access_share_expired(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        past = datetime.now(timezone.utc) - timedelta(days=1)
        share_repo.get_by_token.return_value = _make_share(expires_at=past)
        video_repo.get.return_value = _make_video()

        use_case = AccessShareUseCase(share_repo, video_repo)

        with pytest.raises(ShareExpiredError):
            use_case.execute("token")

    def test_access_video_not_found(self) -> None:
        share_repo = MagicMock()
        video_repo = MagicMock()
        share_repo.get_by_token.return_value = _make_share()
        video_repo.get.return_value = None

        use_case = AccessShareUseCase(share_repo, video_repo)

        with pytest.raises(VideoNotFoundError):
            use_case.execute("token")


class TestListSharesByVideoUseCase:
    def test_lists_shares(self) -> None:
        repo = MagicMock()
        expected = [_make_share(), _make_share(share_id="share_002", token="tok2")]
        repo.list_by_video.return_value = expected

        use_case = ListSharesByVideoUseCase(repo)
        result = use_case.execute("vid_001", "user_001")

        assert len(result) == 2
        repo.list_by_video.assert_called_once_with("vid_001", "user_001")


class TestListSharesByUserUseCase:
    def test_lists_with_total(self) -> None:
        repo = MagicMock()
        items = [_make_share(), _make_share(share_id="s2", token="t2")]
        repo.list_by_user.return_value = items
        repo.count_by_user.return_value = 10

        use_case = ListSharesByUserUseCase(repo)
        result_items, total = use_case.execute("user_001", skip=0, limit=2)

        assert len(result_items) == 2
        assert total == 10
        repo.list_by_user.assert_called_once_with("user_001", skip=0, limit=2)


class TestUpdateShareUseCase:
    def test_update_password(self) -> None:
        repo = MagicMock()
        share = _make_share()
        repo.get_by_id.return_value = share
        repo.update.side_effect = lambda s: s

        use_case = UpdateShareUseCase(repo)
        cmd = UpdateShareCommand(
            share_id="share_001",
            user_id="user_001",
            password="newpass",
        )
        result = use_case.execute(cmd)

        assert result.has_password is True
        assert result.verify_password("newpass") is True
        repo.update.assert_called_once()

    def test_clear_password(self) -> None:
        repo = MagicMock()
        share = _make_share(password="oldpass")
        repo.get_by_id.return_value = share
        repo.update.side_effect = lambda s: s

        use_case = UpdateShareUseCase(repo)
        cmd = UpdateShareCommand(
            share_id="share_001",
            user_id="user_001",
            password="",  # 空字符串=清除密码
        )
        result = use_case.execute(cmd)

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

    def test_password_none_does_not_change(self) -> None:
        repo = MagicMock()
        share = _make_share(password="existing")
        repo.get_by_id.return_value = share
        repo.update.side_effect = lambda s: s

        use_case = UpdateShareUseCase(repo)
        cmd = UpdateShareCommand(
            share_id="share_001",
            user_id="user_001",
            password=None,  # None=不修改
        )
        result = use_case.execute(cmd)

        assert result.verify_password("existing") is True

    def test_update_expires_at(self) -> None:
        repo = MagicMock()
        share = _make_share()
        repo.get_by_id.return_value = share
        repo.update.side_effect = lambda s: s

        use_case = UpdateShareUseCase(repo)
        future = datetime.now(timezone.utc) + timedelta(days=3)
        cmd = UpdateShareCommand(
            share_id="share_001",
            user_id="user_001",
            expires_at=future,
        )
        result = use_case.execute(cmd)

        assert result.expires_at == future

    def test_not_found_raises(self) -> None:
        repo = MagicMock()
        repo.get_by_id.return_value = None

        use_case = UpdateShareUseCase(repo)
        cmd = UpdateShareCommand(share_id="no", user_id="u1", password="x")

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

    def test_past_expiry_raises(self) -> None:
        repo = MagicMock()
        repo.get_by_id.return_value = _make_share()

        use_case = UpdateShareUseCase(repo)
        past = datetime.now(timezone.utc) - timedelta(days=1)
        cmd = UpdateShareCommand(
            share_id="share_001",
            user_id="user_001",
            expires_at=past,
        )

        with pytest.raises(ValueError, match="past"):
            use_case.execute(cmd)


class TestRevokeShareUseCase:
    def test_revoke_success(self) -> None:
        repo = MagicMock()
        repo.get_by_id.return_value = _make_share()
        repo.delete.return_value = True

        use_case = RevokeShareUseCase(repo)
        result = use_case.execute("share_001", "user_001")

        assert result is True
        repo.delete.assert_called_once_with("share_001", "user_001")

    def test_revoke_not_found_raises(self) -> None:
        repo = MagicMock()
        repo.get_by_id.return_value = None

        use_case = RevokeShareUseCase(repo)

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


class TestRecordShareDownloadUseCase:
    def test_record_success(self) -> None:
        repo = MagicMock()
        repo.get_by_token.return_value = _make_share()
        repo.increment_download.return_value = None

        use_case = RecordShareDownloadUseCase(repo)
        use_case.execute("token")

        repo.increment_download.assert_called_once()

    def test_record_with_password(self) -> None:
        repo = MagicMock()
        repo.get_by_token.return_value = _make_share(password="pass")
        repo.increment_download.return_value = None

        use_case = RecordShareDownloadUseCase(repo)
        use_case.execute("token", password="pass")

        repo.increment_download.assert_called_once()

    def test_record_wrong_password_raises(self) -> None:
        repo = MagicMock()
        repo.get_by_token.return_value = _make_share(password="correct")

        use_case = RecordShareDownloadUseCase(repo)

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

    def test_record_share_not_found(self) -> None:
        repo = MagicMock()
        repo.get_by_token.return_value = None

        use_case = RecordShareDownloadUseCase(repo)

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

    def test_record_expired_share(self) -> None:
        repo = MagicMock()
        past = datetime.now(timezone.utc) - timedelta(days=1)
        repo.get_by_token.return_value = _make_share(expires_at=past)

        use_case = RecordShareDownloadUseCase(repo)

        with pytest.raises(ShareExpiredError):
            use_case.execute("token")