"""ScriptService 单元测试 — Issue #1795 口播文案库.

CI 增量映射: script_service.py → test_script_service.py
"""

from __future__ import annotations

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

import pytest
from app.services.script_service import ScriptNotFoundError, ScriptService

# ── helpers ──────────────────────────────────────────────────────────────────


def _make_mock_script(
    script_id="s1",
    user_id="u1",
    title="测试文案",
    content="正文内容",
    segments=None,
    tags=None,
):
    m = MagicMock()
    m.id = script_id
    m.user_id = user_id
    m.title = title
    m.content = content
    m.segments = segments if segments is not None else [{"text": "第一段", "duration": None}]
    m.tags = tags if tags is not None else ["口播"]
    m.created_at = datetime(2026, 9, 8, 12, 0, 0, tzinfo=timezone.utc)
    m.updated_at = datetime(2026, 9, 8, 12, 0, 0, tzinfo=timezone.utc)
    return m


def _make_service(db=None):
    if db is None:
        db = MagicMock()
    return ScriptService(db), db


# ── create ───────────────────────────────────────────────────────────────────


class TestCreateScript:
    def test_create_minimal(self):
        svc, db = _make_service()
        # query chain for get_script (not called here but add mock anyway)
        with patch("app.services.script_service.ScriptModel") as MockModel:
            instance = _make_mock_script()
            MockModel.return_value = instance
            result = svc.create_script(user_id="u1", title="测试文案")
            # ScriptModel was called to create a new instance
            MockModel.assert_called_once()
            db.add.assert_called_once()
            db.commit.assert_called_once()
            db.refresh.assert_called_once()

    def test_create_with_segments_and_tags(self):
        svc, db = _make_service()
        segments = [{"text": "第一段", "duration": 5.0}, {"text": "第二段", "duration": None}]
        tags = ["口播", "教程"]
        with patch("app.services.script_service.ScriptModel") as MockModel:
            instance = _make_mock_script(segments=segments, tags=tags)
            MockModel.return_value = instance
            result = svc.create_script(
                user_id="u1",
                title="分段文案",
                content="完整内容",
                segments=segments,
                tags=tags,
            )
            db.add.assert_called_once()
            call_kwargs = MockModel.call_args
            assert call_kwargs[1]["segments"] == segments
            assert call_kwargs[1]["tags"] == tags

    def test_create_defaults_empty_segments_tags(self):
        svc, db = _make_service()
        with patch("app.services.script_service.ScriptModel") as MockModel:
            MockModel.return_value = _make_mock_script()
            svc.create_script(user_id="u1", title="空文案")
            call_kwargs = MockModel.call_args[1]
            assert call_kwargs["segments"] == []
            assert call_kwargs["tags"] == []


# ── get ──────────────────────────────────────────────────────────────────────


class TestGetScript:
    def test_get_existing(self):
        svc, db = _make_service()
        mock_script = _make_mock_script()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = mock_script
        db.query.return_value = chain

        result = svc.get_script("s1", "u1")
        assert result == mock_script
        # Verify filter was called with correct conditions
        assert chain.filter.called

    def test_get_not_found_raises(self):
        svc, db = _make_service()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = None
        db.query.return_value = chain

        with pytest.raises(ScriptNotFoundError):
            svc.get_script("nonexistent", "u1")

    def test_get_wrong_user_raises(self):
        """不同用户不能访问其他人的文案."""
        svc, db = _make_service()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = None  # filter by user_id returns None
        db.query.return_value = chain

        with pytest.raises(ScriptNotFoundError):
            svc.get_script("s1", "other_user")


# ── list ─────────────────────────────────────────────────────────────────────


class TestListScripts:
    def test_list_default(self):
        svc, db = _make_service()
        items = [_make_mock_script("s1"), _make_mock_script("s2")]
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.count.return_value = 2
        chain.order_by.return_value = chain
        chain.offset.return_value = chain
        chain.limit.return_value = chain
        chain.all.return_value = items
        db.query.return_value = chain

        result, total = svc.list_scripts("u1")
        assert total == 2
        assert len(result) == 2
        chain.offset.assert_called_with(0)
        chain.limit.assert_called_with(50)

    def test_list_with_pagination(self):
        svc, db = _make_service()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.count.return_value = 100
        chain.order_by.return_value = chain
        chain.offset.return_value = chain
        chain.limit.return_value = chain
        chain.all.return_value = []
        db.query.return_value = chain

        result, total = svc.list_scripts("u1", skip=20, limit=10)
        chain.offset.assert_called_with(20)
        chain.limit.assert_called_with(10)

    def test_list_filter_by_tag(self):
        svc, db = _make_service()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.count.return_value = 1
        chain.order_by.return_value = chain
        chain.offset.return_value = chain
        chain.limit.return_value = chain
        chain.all.return_value = [_make_mock_script()]
        db.query.return_value = chain

        result, total = svc.list_scripts("u1", tag="口播")
        # filter should be called twice: once for user_id, once for tag
        assert chain.filter.call_count == 2


# ── update ───────────────────────────────────────────────────────────────────


class TestUpdateScript:
    def test_update_title(self):
        svc, db = _make_service()
        mock_script = _make_mock_script()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = mock_script
        db.query.return_value = chain

        result = svc.update_script("s1", "u1", title="新标题")
        assert mock_script.title == "新标题"
        db.commit.assert_called_once()

    def test_update_segments(self):
        svc, db = _make_service()
        mock_script = _make_mock_script()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = mock_script
        db.query.return_value = chain

        new_segments = [{"text": "更新后段落", "duration": 10.0}]
        result = svc.update_script("s1", "u1", segments=new_segments)
        assert mock_script.segments == new_segments

    def test_update_not_found_raises(self):
        svc, db = _make_service()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = None
        db.query.return_value = chain

        with pytest.raises(ScriptNotFoundError):
            svc.update_script("nonexistent", "u1", title="x")

    def test_update_partial_only_changes_specified(self):
        svc, db = _make_service()
        mock_script = _make_mock_script(title="原标题", content="原内容")
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = mock_script
        db.query.return_value = chain

        # Only update tags, title and content should stay the same
        svc.update_script("s1", "u1", tags=["新标签"])
        assert mock_script.title == "原标题"
        assert mock_script.content == "原内容"
        assert mock_script.tags == ["新标签"]


# ── delete ───────────────────────────────────────────────────────────────────


class TestDeleteScript:
    def test_delete_existing(self):
        svc, db = _make_service()
        mock_script = _make_mock_script()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = mock_script
        db.query.return_value = chain

        result = svc.delete_script("s1", "u1")
        assert result is True
        db.delete.assert_called_once_with(mock_script)
        db.commit.assert_called_once()

    def test_delete_not_found(self):
        svc, db = _make_service()
        chain = MagicMock()
        chain.filter.return_value = chain
        chain.first.return_value = None
        db.query.return_value = chain

        result = svc.delete_script("nonexistent", "u1")
        assert result is False
        db.delete.assert_not_called()