"""Tests for ZhihuAdapter

Tests cover:
- Answer content extraction
- Zhuanlan (article) content extraction
- Cookie-based authentication
- Login page detection
- AuthError handling

Phase 09 - Pipeline Integration:
- ZhihuAdapter now uses ZhihuCrawler instead of ZhihuPlaywrightExtractor
- Comments are included by default and appended to content
- Cookie expiration triggers QR code login
- Idempotency via IdempotencyChecker
"""

import pytest
from unittest.mock import MagicMock, patch, PropertyMock
import asyncio
from pathlib import Path
from datetime import datetime

from kb_workflow.pipeline.platforms.zhihu import ZhihuAdapter
from kb_workflow.pipeline.errors import AuthError

# =============================================================================
# Mock Fixtures for ZhihuCrawler Integration (Phase 09)
# =============================================================================


@pytest.fixture
def mock_crawl_answer_result():
    """Mock CrawlResult from ZhihuCrawler.crawl_answer().

    Simulates successful answer crawl with metadata and content.
    Used for testing ZhihuAdapter integration with new crawler.
    """
    from kb_workflow.crawler.models import (
        CrawlResult, AnswerData, AuthorInfo, ContentMetadata, CommentData, CommentAuthor
    )

    return CrawlResult(
        success=True,
        content_type="answer",
        data=AnswerData(
            id=789012,
            question_id=123456,
            question_title="Test Question Title for Pipeline Integration",
            content="<p>This is the <strong>answer</strong> content from ZhihuCrawler.</p>",
            excerpt="This is the answer content from ZhihuCrawler.",
            metadata=ContentMetadata(
                author=AuthorInfo(
                    name="Test Author",
                    url_token="test-author-123",
                    headline="Test Author Headline"
                ),
                voteup_count=1234,
                comment_count=56,
                created_time=1705312800,  # 2024-01-15 10:00:00 UTC
                updated_time=1705399200   # 2024-01-16 10:00:00 UTC
            )
        ),
        comments=[
            CommentData(
                id=111,
                content="Great answer! Very helpful.",
                author=CommentAuthor(name="Commenter1", url_token="commenter-1"),
                created_time=1705316400,
                like_count=42,
                child_count=3,
                is_author=False
            ),
            CommentData(
                id=222,
                content="Thanks for sharing!",
                author=CommentAuthor(name="Commenter2", url_token="commenter-2"),
                created_time=1705320000,
                like_count=15,
                child_count=0,
                is_author=False
            )
        ],
        error=None
    )


@pytest.fixture
def mock_crawl_article_result():
    """Mock CrawlResult from ZhihuCrawler.crawl_article().

    Simulates successful zhuanlan article crawl.
    Used for testing ZhihuAdapter integration with new crawler.
    """
    from kb_workflow.crawler.models import (
        CrawlResult, ArticleData, AuthorInfo, ContentMetadata, CommentData, CommentAuthor
    )

    return CrawlResult(
        success=True,
        content_type="article",
        data=ArticleData(
            id=123456,
            title="Test Article Title for Pipeline Integration",
            content="<h1>Article Content</h1><p>This is the <em>article</em> content.</p>",
            excerpt="Article Content This is the article content.",
            metadata=ContentMetadata(
                author=AuthorInfo(
                    name="Test Article Author",
                    url_token="test-article-author",
                    headline="Writer and Developer"
                ),
                voteup_count=5678,
                comment_count=89,
                created_time=1705226400,  # 2024-01-14 10:00:00 UTC
                updated_time=None
            )
        ),
        comments=[
            CommentData(
                id=333,
                content="Excellent article!",
                author=CommentAuthor(name="Reader1", url_token="reader-1"),
                created_time=1705230000,
                like_count=28,
                child_count=1,
                is_author=False
            )
        ],
        error=None
    )


@pytest.fixture
def mock_crawl_no_comments_result():
    """Mock CrawlResult without comments."""
    from kb_workflow.crawler.models import (
        CrawlResult, AnswerData, AuthorInfo, ContentMetadata
    )

    return CrawlResult(
        success=True,
        content_type="answer",
        data=AnswerData(
            id=789012,
            question_id=123456,
            question_title="Test Question No Comments",
            content="<p>Answer without comments.</p>",
            excerpt="Answer without comments.",
            metadata=ContentMetadata(
                author=AuthorInfo(name="Test Author", url_token="test-author"),
                voteup_count=100,
                comment_count=0,
                created_time=1705312800,
                updated_time=None
            )
        ),
        comments=[],
        error=None
    )


@pytest.fixture
def mock_comments_list():
    """Mock list of CommentData for testing comment formatting.

    Provides a realistic set of comments with various attributes.
    """
    from kb_workflow.crawler.models import CommentData, CommentAuthor

    return [
        CommentData(
            id=1001,
            content="This is the first comment with some content.",
            author=CommentAuthor(name="User1", url_token="user-1"),
            created_time=1705316400,
            like_count=100,
            child_count=5,
            is_author=False
        ),
        CommentData(
            id=1002,
            content="This is the second comment, from the author.",
            author=CommentAuthor(name="AuthorName", url_token="author-token"),
            created_time=1705320000,
            like_count=50,
            child_count=2,
            is_author=True
        ),
        CommentData(
            id=1003,
            content="Third comment here.",
            author=CommentAuthor(name="User3", url_token="user-3"),
            created_time=1705323600,
            like_count=25,
            child_count=0,
            is_author=False
        )
    ]


@pytest.fixture
def mock_zhihu_login_result():
    """Mock ZhihuLoginResult from ZhihuLogin.login_by_qrcode().

    Simulates successful QR code login result.
    Used for testing cookie refresh flow.
    """
    from kb_workflow.auth.zhihu_login import ZhihuLoginResult
    from pathlib import Path

    return ZhihuLoginResult(
        success=True,
        cookie_str="z_c0=test_cookie_value; _xsrf=test_xsrf; d_c0=test_d_c0",
        qrcode_path=Path("/tmp/test_qrcode.png"),
        error_message=None
    )


@pytest.fixture
def mock_crawl_failed_result():
    """Mock failed CrawlResult for error handling tests."""
    from kb_workflow.crawler.models import CrawlResult

    return CrawlResult(
        success=False,
        content_type="answer",
        data=None,
        comments=None,
        error="Cookie expired or invalid"
    )


@pytest.fixture
def mock_idempotency_checker():
    """Mock IdempotencyChecker for testing idempotent behavior."""
    mock = MagicMock()
    mock.is_processed.return_value = False
    return mock


# =============================================================================
# Basic Adapter Tests
# =============================================================================


class TestZhihuAdapterBasic:
    """Tests for basic ZhihuAdapter functionality"""

    def test_get_content_type_answer(self):
        """Test content type detection for answer URLs"""
        adapter = ZhihuAdapter()
        adapter._cookie = "test"  # Avoid config loading

        assert adapter.get_content_type("https://www.zhihu.com/question/123456/answer/789012") == "answer"
        assert adapter.get_content_type("https://zhihu.com/question/123/answer/456") == "answer"

    def test_get_content_type_zhuanlan(self):
        """Test content type detection for zhuanlan URLs"""
        adapter = ZhihuAdapter()
        adapter._cookie = "test"  # Avoid config loading

        assert adapter.get_content_type("https://zhuanlan.zhihu.com/p/123456") == "zhuanlan"
        assert adapter.get_content_type("https://zhuanlan.zhihu.com/p/abc123") == "zhuanlan"

    def test_get_content_type_unknown(self):
        """Test content type detection for unknown URLs"""
        adapter = ZhihuAdapter()
        adapter._cookie = "test"  # Avoid config loading

        assert adapter.get_content_type("https://www.zhihu.com/question/123456") == "unknown"
        assert adapter.get_content_type("https://www.zhihu.com/") == "unknown"
        assert adapter.get_content_type("https://example.com") == "unknown"

    def test_get_output_filename(self):
        """Test output filename generation"""
        adapter = ZhihuAdapter()
        adapter._cookie = "test"  # Avoid config loading

        assert adapter.get_output_filename("789012", "answer", "metadata.json") == "zhihu_789012_metadata.json"
        assert adapter.get_output_filename("123456", "zhuanlan", "content.md") == "zhihu_123456_content.md"

    def test_platform_constant(self):
        """Test PLATFORM constant"""
        adapter = ZhihuAdapter()
        adapter._cookie = "test"  # Avoid config loading
        assert adapter.PLATFORM == "zhihu"


# =============================================================================
# ZhihuCrawler Integration Tests (Phase 09)
# =============================================================================


class TestZhihuAdapterCrawlerIntegration:
    """Tests for ZhihuAdapter integration with ZhihuCrawler.

    These tests verify the adapter correctly uses the new ZhihuCrawler
    instead of ZhihuPlaywrightExtractor.
    """

    @pytest.mark.asyncio
    async def test_fetch_metadata_answer(self, mock_crawl_answer_result):
        """Test fetching answer metadata via ZhihuCrawler.

        Verifies:
        - ZhihuCrawler.crawl_answer() is called with include_comments=True
        - Metadata is correctly extracted from CrawlResult
        - Output format matches expected adapter response
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "test_cookie"

        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_answer_result):
            metadata = await adapter.fetch_metadata("789012", "answer", source_url="https://www.zhihu.com/question/123456/answer/789012")

        assert metadata["title"] == "Test Question Title for Pipeline Integration"
        assert metadata["author"] == "Test Author"
        assert metadata["type"] == "answer"
        assert metadata["voteup_count"] == 1234

    @pytest.mark.asyncio
    async def test_fetch_metadata_article(self, mock_crawl_article_result):
        """Test fetching zhuanlan article metadata via ZhihuCrawler.

        Verifies:
        - ZhihuCrawler.crawl_article() is called with correct URL
        - Metadata is correctly extracted from CrawlResult
        - Output format matches expected adapter response
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "test_cookie"

        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_article_result):
            metadata = await adapter.fetch_metadata("123456", "zhuanlan")

        assert metadata["title"] == "Test Article Title for Pipeline Integration"
        assert metadata["author"] == "Test Article Author"
        assert metadata["type"] == "zhuanlan"

    @pytest.mark.asyncio
    async def test_fetch_content_with_comments(self, mock_crawl_answer_result):
        """Test fetching content with comments appended.

        Verifies:
        - Content is fetched with include_comments=True
        - Comments are appended to content in correct Markdown format
        - Comment format: numbered list with author mention
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "test_cookie"

        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_answer_result):
            content = await adapter.fetch_content("789012", "answer", source_url="https://www.zhihu.com/question/123456/answer/789012")

        # Verify YAML frontmatter
        assert "---" in content
        assert "title:" in content

        # Verify main content
        assert "Test Question Title for Pipeline Integration" in content

        # Verify comments section is appended
        assert "## 热门评论" in content
        assert "@Commenter1" in content
        assert "Great answer!" in content

    @pytest.mark.asyncio
    async def test_fetch_metadata_no_cookie_raises_auth_error(self):
        """Test that missing cookie raises AuthError"""
        adapter = ZhihuAdapter()
        adapter._cookie = ""  # Empty cookie

        with pytest.raises(AuthError) as exc_info:
            await adapter.fetch_metadata("789012", "answer")

        assert exc_info.value.auth_type == "zhihu_cookie"


# =============================================================================
# Cookie Expiration and Auto-Login Tests (Task 2)
# =============================================================================


class TestZhihuAdapterCookieHandling:
    """Tests for cookie handling and auto-login"""

    @pytest.mark.asyncio
    async def test_cookie_valid_returns_data(self, mock_crawl_answer_result):
        """Test that valid cookie allows normal data retrieval"""
        adapter = ZhihuAdapter()
        adapter._cookie = "valid_cookie"

        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_answer_result):
            metadata = await adapter.fetch_metadata("789012", "answer")

        assert metadata["title"] == "Test Question Title for Pipeline Integration"

    @pytest.mark.asyncio
    async def test_cookie_expired_triggers_login(self, mock_crawl_failed_result, mock_zhihu_login_result, mock_crawl_answer_result):
        """Test that expired cookie triggers QR code login flow.

        Verifies:
        - CrawlResult with success=False triggers login
        - ZhihuLogin.login_by_qrcode() is called
        - New cookie is used to retry the fetch
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "expired_cookie"

        # First call fails (cookie expired), second succeeds after login
        crawl_results = [mock_crawl_failed_result, mock_crawl_answer_result]

        with patch.object(adapter, '_crawl_with_crawler', side_effect=crawl_results):
            with patch.object(adapter, '_trigger_qrcode_login', return_value=mock_zhihu_login_result):
                metadata = await adapter.fetch_metadata("789012", "answer")

        # Verify login was triggered and cookie was updated
        assert adapter._cookie == mock_zhihu_login_result.cookie_str

    @pytest.mark.asyncio
    async def test_login_retry_success(self, mock_crawl_failed_result, mock_zhihu_login_result, mock_crawl_answer_result):
        """Test that after successful login, retry succeeds"""
        adapter = ZhihuAdapter()
        adapter._cookie = "expired_cookie"

        crawl_results = [mock_crawl_failed_result, mock_crawl_answer_result]

        with patch.object(adapter, '_crawl_with_crawler', side_effect=crawl_results):
            with patch.object(adapter, '_trigger_qrcode_login', return_value=mock_zhihu_login_result):
                content = await adapter.fetch_content("789012", "answer")

        # Verify login was triggered and cookie was updated
        assert adapter._cookie == mock_zhihu_login_result.cookie_str
        assert "Test Question Title for Pipeline Integration" in content

    @pytest.mark.asyncio
    async def test_login_failure_raises_error(self, mock_crawl_failed_result):
        """Test that failed login raises appropriate error"""
        from kb_workflow.auth.zhihu_login import ZhihuLoginResult

        adapter = ZhihuAdapter()
        adapter._cookie = "expired_cookie"

        failed_login = ZhihuLoginResult(
            success=False,
            cookie_str="",
            error_message="Login timeout"
        )

        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_failed_result):
            with patch.object(adapter, '_trigger_qrcode_login', return_value=failed_login):
                with pytest.raises(AuthError) as exc_info:
                    await adapter.fetch_metadata("789012", "answer")

        assert exc_info.value.auth_type == "zhihu_cookie"


# =============================================================================
# Comment Formatting Tests (Task 3)
# =============================================================================


class TestZhihuAdapterCommentFormatting:
    """Tests for comment formatting functionality"""

    @pytest.mark.asyncio
    async def test_comment_formatting_with_comments(self, mock_crawl_answer_result):
        """Test that comments are formatted with proper Markdown structure.

        Verifies:
        - Comments section starts with "---" separator
        - "## 热门评论" heading is present
        - Each comment is numbered with bold author name
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "test_cookie"

        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_answer_result):
            content = await adapter.fetch_content("789012", "answer")

        # Check comment section structure
        assert "---" in content
        assert "## 热门评论" in content

        # Check comment formatting: numbered list with author
        assert "1. **@Commenter1**" in content or "1. **@Commenter1**" in content
        assert "Great answer!" in content

    @pytest.mark.asyncio
    async def test_comment_formatting_no_comments(self, mock_crawl_no_comments_result):
        """Test that no comments section is added when there are no comments.

        Verifies:
        - No "---" separator for empty comments
        - No "## 热门评论" heading when comments list is empty
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "test_cookie"

        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_no_comments_result):
            content = await adapter.fetch_content("789012", "answer")

        # No comments section should be present
        assert "## 热门评论" not in content

    def test_format_comments_section(self, mock_comments_list):
        """Test internal _format_comments_section method.

        Verifies:
        - Comments are formatted as numbered list
        - Author name is bold/mentioned
        - Like count is included
        - Format matches expected style:
          1. **@AuthorName** (100 likes): Comment content...
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "test"

        result = adapter._format_comments_section(mock_comments_list)

        # Check format structure
        assert "1. **@User1**" in result
        assert "(100 likes)" in result or "100 likes" in result
        assert "This is the first comment" in result

        # Check author comment indicator
        assert "@AuthorName" in result


# =============================================================================
# Idempotency Tests (Task 3)
# =============================================================================


class TestZhihuAdapterIdempotency:
    """Tests for idempotent execution"""

    @pytest.mark.asyncio
    async def test_idempotent_execution_skips_processed(self, mock_crawl_answer_result, tmp_path):
        """Test that idempotent check prevents reprocessing when output_dir is set.

        Verifies:
        - If output_dir is set and content is already processed, cached result is returned
        - No duplicate fetches are made
        """
        import json

        adapter = ZhihuAdapter(output_dir=tmp_path)
        adapter._cookie = "test_cookie"

        # Create existing files to simulate already processed content
        metadata_file = tmp_path / "zhihu_789012_metadata.json"
        content_file = tmp_path / "zhihu_789012_content.md"
        cached_metadata = {
            "title": "Cached Title",
            "author": "Cached Author",
            "type": "answer"
        }
        metadata_file.write_text(json.dumps(cached_metadata))
        content_file.write_text("Cached content")

        # When content is already processed, should return cached result
        with patch.object(adapter, '_crawl_with_crawler') as mock_crawl:
            metadata = await adapter.fetch_metadata("789012", "answer")

            # Should NOT have called the crawler since content is cached
            mock_crawl.assert_not_called()

        # Should return cached metadata
        assert metadata["title"] == "Cached Title"

    @pytest.mark.asyncio
    async def test_different_content_processes_independently(self, mock_crawl_answer_result, mock_crawl_article_result):
        """Test that different content IDs are processed independently.

        Verifies:
        - Processing one content doesn't affect processing of another
        - Each content_id is tracked separately
        """
        adapter = ZhihuAdapter()
        adapter._cookie = "test_cookie"

        # Process answer
        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_answer_result):
            metadata_answer = await adapter.fetch_metadata("789012", "answer")

        # Process article
        with patch.object(adapter, '_crawl_with_crawler', return_value=mock_crawl_article_result):
            metadata_article = await adapter.fetch_metadata("123456", "zhuanlan")

        # Both should return their respective data
        assert metadata_answer["title"] == "Test Question Title for Pipeline Integration"
        assert metadata_article["title"] == "Test Article Title for Pipeline Integration"


# =============================================================================
# Cookie Settings Tests
# =============================================================================


class TestZhihuAdapterCookieSettings:
    """Tests for cookie loading from settings"""

    def test_cookie_from_settings(self):
        """Test cookie is loaded from settings"""
        with patch('kb_workflow.pipeline.platforms.zhihu.get_settings') as mock_settings:
            mock_secret = MagicMock()
            mock_secret.get_secret_value.return_value = "test_cookie_value"
            mock_settings.return_value.zhihu_cookie = mock_secret

            adapter = ZhihuAdapter()
            assert adapter.cookie == "test_cookie_value"