"""页面路由测试 — detail、trends、compare、graceful degradation。"""

from __future__ import annotations

from datetime import date
from unittest.mock import patch as upatch

import pytest

from app.config import settings


# ═══════════════════════════════════════════════════════════════════════
# Detail 页 & 相似论文
# ═══════════════════════════════════════════════════════════════════════


class TestDetailPage:
    """论文详情页测试。"""

    def test_detail_page_renders(self, client, sample_papers_with_summary):
        """详情页正常渲染。"""
        resp = client.get("/paper/2401.20001")
        assert resp.status_code == 200
        assert "测试论文" in resp.text or "Test Paper" in resp.text

    def test_detail_page_not_found(self, client):
        """不存在的论文返回 404。"""
        resp = client.get("/paper/nonexistent.99999")
        assert resp.status_code == 404


# ═══════════════════════════════════════════════════════════════════════
# Similar API（详情页内联）
# ═══════════════════════════════════════════════════════════════════════


class TestDetailSimilarPapers:
    """详情页相似论文模块测试（CHROMA 关闭时的降级行为）。"""

    def test_detail_page_renders_with_similar(self, client, sample_papers_with_summary):
        """详情页正常渲染（含相似论文模块）。"""
        resp = client.get("/paper/2401.20001")
        assert resp.status_code == 200
        assert "测试论文" in resp.text or "Test Paper" in resp.text

    def test_detail_page_not_found_similar(self, client):
        """不存在的论文返回 404。"""
        resp = client.get("/paper/nonexistent.99999")
        assert resp.status_code == 404


# ═══════════════════════════════════════════════════════════════════════
# Trends Dashboard
# ═══════════════════════════════════════════════════════════════════════


class TestTrendsDashboard:
    """趋势看板测试。"""

    def test_trends_page_renders(self, client, sample_papers_with_summary):
        """趋势看板页面正常渲染。"""
        resp = client.get("/trends")
        assert resp.status_code == 200
        assert "趋势看板" in resp.text
        assert "chart" in resp.text.lower() or "Chart" in resp.text

    def test_trends_api_returns_data(self, client, sample_papers_with_summary):
        """趋势 API 返回正确数据结构。"""
        resp = client.get("/api/stats/trends")
        assert resp.status_code == 200
        data = resp.json()

        assert "daily_counts" in data
        assert "top_tags" in data
        assert "upvotes_dist" in data
        assert "summary_completion" in data

        assert isinstance(data["daily_counts"], list)
        assert isinstance(data["top_tags"], list)
        assert isinstance(data["upvotes_dist"], list)
        assert isinstance(data["summary_completion"], list)

    def test_trends_api_daily_counts(self, client, sample_papers_with_summary):
        """每日论文数量数据正确。"""
        # 使用测试数据的日期范围
        with upatch("app.services.trends.date") as mock_date:
            mock_date.today.return_value = date(2024, 1, 20)
            mock_date.side_effect = lambda *a, **kw: date(*a, **kw)

            resp = client.get("/api/stats/trends")
            data = resp.json()
            assert len(data["daily_counts"]) == 5
            for item in data["daily_counts"]:
                assert "date" in item
                assert "count" in item
                assert item["count"] == 1

    def test_trends_api_top_tags(self, client, sample_papers_with_summary):
        """热门标签数据正确。"""
        resp = client.get("/api/stats/trends")
        data = resp.json()
        tags = {t["tag"]: t["count"] for t in data["top_tags"]}
        assert "NLP" in tags
        assert tags["NLP"] == 5  # 所有论文都有 NLP

    def test_trends_api_summary_completion(self, client, sample_papers_with_summary):
        """总结完成率数据正确。"""
        resp = client.get("/api/stats/trends")
        data = resp.json()
        statuses = {s["status"]: s["count"] for s in data["summary_completion"]}
        assert "done" in statuses
        assert statuses["done"] == 4  # 4 篇已完成

    def test_trends_empty_db(self, client):
        """无数据时不崩溃。"""
        resp = client.get("/api/stats/trends")
        assert resp.status_code == 200
        data = resp.json()
        assert data["daily_counts"] == []
        assert data["top_tags"] == []


# ═══════════════════════════════════════════════════════════════════════
# Compare Page
# ═══════════════════════════════════════════════════════════════════════


class TestComparePage:
    """论文对比页测试。"""

    def test_compare_page_no_ids(self, client):
        """无 ID 时显示输入表单。"""
        resp = client.get("/compare")
        assert resp.status_code == 200
        assert "对比" in resp.text

    def test_compare_page_with_ids(self, client, sample_papers_with_summary):
        """对比多篇论文正常渲染。"""
        resp = client.get("/compare?ids=2401.20001,2401.20002")
        assert resp.status_code == 200
        assert "2401.20001" in resp.text
        assert "2401.20002" in resp.text
        # 应包含对比字段
        assert "一句话摘要" in resp.text
        assert "研究问题" in resp.text

    def test_compare_page_max_5(self, client, sample_papers_with_summary):
        """最多 5 篇。"""
        ids = "2401.20001,2401.20002,2401.20003,2401.20004,2401.20005"
        resp = client.get(f"/compare?ids={ids}")
        assert resp.status_code == 200

    def test_compare_page_over_5_truncates(self, client, sample_papers_with_summary):
        """超过 5 篇截断。"""
        ids = "2401.20001,2401.20002,2401.20003,2401.20004,2401.20005,2401.20006"
        resp = client.get(f"/compare?ids={ids}")
        assert resp.status_code == 200

    def test_compare_page_invalid_ids(self, client):
        """无效 ID 时显示空结果。"""
        resp = client.get("/compare?ids=nonexistent.99999")
        assert resp.status_code == 200

    def test_compare_page_shows_no_summary_placeholder(self, client, sample_papers_with_summary):
        """无总结的论文显示占位文本。"""
        # 2401.20005 没有 summary（status=pending）
        resp = client.get("/compare?ids=2401.20005")
        assert resp.status_code == 200
        assert "暂无总结" in resp.text


# ═══════════════════════════════════════════════════════════════════════
# Nav Bar
# ═══════════════════════════════════════════════════════════════════════


class TestNavBar:
    """导航栏测试。"""

    def test_nav_includes_trends_link(self, client):
        """导航栏应包含趋势链接。"""
        resp = client.get("/search")
        assert resp.status_code == 200
        assert "/trends" in resp.text

    def test_nav_includes_compare_implicitly(self, client):
        """compare 页面可访问。"""
        resp = client.get("/compare")
        assert resp.status_code == 200


# ═══════════════════════════════════════════════════════════════════════
# Graceful Degradation（CHROMA_ENABLED=false）
# ═══════════════════════════════════════════════════════════════════════


class TestGracefulDegradation:
    """CHROMA_ENABLED=false 时优雅降级测试。"""

    def test_search_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
        """CHROMA 关闭时 FTS5 搜索正常工作。"""
        monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
        resp = client.get("/search?q=Test")
        assert resp.status_code == 200
        assert "Test Paper" in resp.text or "测试论文" in resp.text

    def test_detail_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
        """CHROMA 关闭时详情页正常工作。"""
        monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
        resp = client.get("/paper/2401.20001")
        assert resp.status_code == 200

    def test_trends_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
        """CHROMA 关闭时趋势看板正常工作。"""
        monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
        resp = client.get("/trends")
        assert resp.status_code == 200

    def test_compare_works_without_chroma(self, client, monkeypatch, sample_papers_with_summary):
        """CHROMA 关闭时对比页正常工作。"""
        monkeypatch.setattr(settings, "CHROMA_ENABLED", False)
        resp = client.get("/compare?ids=2401.20001,2401.20002")
        assert resp.status_code == 200