"""TreeEnvironment 运行时单元测试。"""

from __future__ import annotations

from pathlib import Path

import numpy as np
import pytest

from app.tree.environment import TreeEnvironment
from app.tree.index import (
    IndexMeta,
    L1Card,
    L1Node,
    L2Card,
    L2Node,
    L3Card,
    L3Node,
    TreeIndex,
)


def _make_test_index() -> TreeIndex:
    """构建测试用的三层树索引。"""
    l3_0 = L3Node(
        id="vid_L1_000_L2_000_L3_000",
        card=L3Card(
            "运动员在跑步",
            ["运动员"],
            ["跑步"],
            ["Nike"],
            "居中",
            {"lighting": "明亮"},
        ),
        timestamp=1.0,
        frame_path="frames/L1_000_L2_000_L3_000.jpg",
        subtitle="he is running",
    )
    l3_1 = L3Node(
        id="vid_L1_000_L2_000_L3_001",
        card=L3Card(
            "观众欢呼",
            ["观众"],
            ["欢呼"],
            [],
            "广角",
            {},
        ),
        timestamp=3.0,
        frame_path="frames/L1_000_L2_000_L3_001.jpg",
    )
    l2 = L2Node(
        id="vid_L1_000_L2_000",
        card=L2Card(
            "比赛片段",
            ["运动员"],
            ["跑步"],
            ["运动员"],
            ["Nike"],
            "",
            None,
        ),
        time_range=(0.0, 10.0),
        children=[l3_0, l3_1],
    )
    l1 = L1Node(
        id="vid_L1_000",
        card=L1Card(
            "体育赛事",
            "体育场",
            ["运动员"],
            ["比赛"],
            ["体育"],
            ["Nike"],
            "从左到右",
        ),
        time_range=(0.0, 10.0),
        children=[l2],
    )
    return TreeIndex(metadata=IndexMeta("/test.mp4", "video"), roots=[l1])


class TestViewNode:
    """view_node 方法测试。"""

    def test_l3_node(self) -> None:
        """L3 节点应显示帧描述。"""
        env = TreeEnvironment(_make_test_index())
        result = env.view_node("vid_L1_000_L2_000_L3_000")
        assert "运动员在跑步" in result
        assert "vid_L1_000_L2_000_L3_000" in result

    def test_l2_node_shows_children(self) -> None:
        """L2 节点应显示子节点概览。"""
        env = TreeEnvironment(_make_test_index())
        result = env.view_node("vid_L1_000_L2_000")
        assert "比赛片段" in result
        assert "vid_L1_000_L2_000_L3_000" in result  # child listed

    def test_anchor_mode(self) -> None:
        """锚模式应在输出中添加 [cN] 标记。"""
        env = TreeEnvironment(_make_test_index())
        result = env.view_node("vid_L1_000_L2_000_L3_000", anchor=True)
        assert "[c" in result  # anchor markers present

    def test_unknown_node_raises(self) -> None:
        """查询不存在的节点应抛出 KeyError。"""
        env = TreeEnvironment(_make_test_index())
        with pytest.raises(KeyError):
            env.view_node("nonexistent")


class TestSearchSimilar:
    """search_similar 方法测试。"""

    def test_returns_results(self) -> None:
        """使用 embed_fn 应返回搜索结果。"""
        index = _make_test_index()

        def fake_embed(
            texts: str | list[str],
        ) -> np.ndarray:
            if isinstance(texts, str):
                texts = [texts]
            return np.random.randn(len(texts), 4).astype(np.float32)

        index.embed_all(fake_embed, "test", 4)
        env = TreeEnvironment(index)
        results = env.search_similar("运动员", top_k=3, embed_fn=fake_embed)
        assert len(results) > 0
        assert all(isinstance(r, tuple) and len(r) == 2 for r in results)

    def test_ancestor_dedup(self) -> None:
        """祖先去重：如果 L3 已在结果中，其 L1/L2 祖先应被跳过。"""
        index = _make_test_index()
        # 手动设置 embedding，使 L3 节点分数高于 L1/L2
        l3_0 = index.roots[0].children[0].children[0]
        l3_1 = index.roots[0].children[0].children[1]
        l2 = index.roots[0].children[0]
        l1 = index.roots[0]
        l3_0.embedding = np.array([1.0, 0, 0, 0], dtype=np.float32)
        l3_1.embedding = np.array([0.9, 0.1, 0, 0], dtype=np.float32)
        l2.embedding = np.array([0.5, 0.5, 0, 0], dtype=np.float32)
        l1.embedding = np.array([0.3, 0.3, 0.3, 0], dtype=np.float32)
        index.metadata.embed_model = "test"
        index.metadata.embed_dim = 4

        env = TreeEnvironment(index)
        results = env.search_similar(
            "运动员",
            top_k=5,
            embed_fn=lambda t: np.array([[1.0, 0, 0, 0]], dtype=np.float32),
        )
        result_ids = [r[0] for r in results]
        # L3 节点应存在；其祖先应被去重跳过
        assert "vid_L1_000_L2_000_L3_000" in result_ids

    def test_with_embed_fn_overrides_existing(self) -> None:
        """即使已有 embedding，提供 embed_fn 时仍应用于 query 编码。"""
        index = _make_test_index()

        def fake_embed(
            texts: str | list[str],
        ) -> np.ndarray:
            if isinstance(texts, str):
                texts = [texts]
            return np.random.randn(len(texts), 4).astype(np.float32)

        index.embed_all(fake_embed, "test", 4)
        env = TreeEnvironment(index)

        def query_embed(
            texts: str | list[str],
        ) -> np.ndarray:
            if isinstance(texts, str):
                texts = [texts]
            return np.ones((len(texts), 4), dtype=np.float32) * 0.5

        results = env.search_similar("test", top_k=2, embed_fn=query_embed)
        assert len(results) > 0

    def test_no_embed_fn_raises(self) -> None:
        """未提供 embed_fn 时应报错。"""
        index = _make_test_index()
        env = TreeEnvironment(index)
        with pytest.raises(ValueError, match="embed_fn"):
            env.search_similar("test", top_k=3)


class TestGetSubtitle:
    """get_subtitle 方法测试。"""

    def test_existing_subtitle(self) -> None:
        """有字幕的节点应返回字幕文本。"""
        env = TreeEnvironment(_make_test_index())
        assert env.get_subtitle("vid_L1_000_L2_000_L3_000") == "he is running"

    def test_no_subtitle(self) -> None:
        """无字幕的节点应返回空字符串。"""
        env = TreeEnvironment(_make_test_index())
        assert env.get_subtitle("vid_L1_000_L2_000_L3_001") == ""

    def test_unknown_node(self) -> None:
        """不存在的节点应返回空字符串。"""
        env = TreeEnvironment(_make_test_index())
        assert env.get_subtitle("nonexistent") == ""


class TestResolveFramePaths:
    """resolve_frame_paths 方法测试。"""

    def test_l3_nodes(self) -> None:
        """L3 节点应映射到帧文件路径。"""
        env = TreeEnvironment(_make_test_index(), frames_dir=Path("/data/frames"))
        paths = env.resolve_frame_paths(["vid_L1_000_L2_000_L3_000"])
        assert len(paths) == 1
        assert "L1_000_L2_000_L3_000" in str(paths[0])

    def test_l2_expands_to_children(self) -> None:
        """L2 节点应展开为其所有 L3 子节点的帧路径。"""
        env = TreeEnvironment(_make_test_index(), frames_dir=Path("/data/frames"))
        paths = env.resolve_frame_paths(["vid_L1_000_L2_000"])
        assert len(paths) == 2  # 2 L3 children

    def test_no_frames_dir_uses_node_path(self) -> None:
        """未提供 frames_dir 时应使用节点自带的 frame_path。"""
        env = TreeEnvironment(_make_test_index())
        paths = env.resolve_frame_paths(["vid_L1_000_L2_000_L3_000"])
        assert len(paths) == 1
        assert "L1_000_L2_000_L3_000" in str(paths[0])

    def test_empty_list_returns_empty(self) -> None:
        """空列表应返回空结果。"""
        env = TreeEnvironment(_make_test_index(), frames_dir=Path("/data/frames"))
        paths = env.resolve_frame_paths([])
        assert paths == []


class TestGetNodeText:
    """get_node_text 方法测试。"""

    def test_normal_mode_returns_full_text(self) -> None:
        """默认模式应返回完整文本和 None anchor_map。"""
        env = TreeEnvironment(_make_test_index())
        text, anchor_map = env.get_node_text("vid_L1_000_L2_000_L3_000")
        assert "运动员在跑步" in text
        assert anchor_map is None

    def test_anchor_mode_returns_anchored_text_and_map(self) -> None:
        """锚模式应返回带锚文本和 anchor_map 字典。"""
        env = TreeEnvironment(_make_test_index())
        text, anchor_map = env.get_node_text(
            "vid_L1_000_L2_000_L3_000", anchor=True,
        )
        # 锚文本包含 [cN] 标记
        assert "[c1]" in text
        # anchor_map 非空，键为锚标（如 "c1"），值为对应行文本
        assert anchor_map is not None
        assert len(anchor_map) > 0
        assert "c1" in anchor_map
        # 字幕行也应在 anchor_map 中（该节点有 subtitle）
        assert any(k.startswith("s") for k in anchor_map)

    def test_nonexistent_node_raises(self) -> None:
        """查询不存在的节点应抛出 KeyError。"""
        env = TreeEnvironment(_make_test_index())
        with pytest.raises(KeyError):
            env.get_node_text("nonexistent")

    def test_node_without_subtitle_no_s_anchors(self) -> None:
        """无字幕的 L3 节点锚模式不应产生 [sN] 锚。"""
        env = TreeEnvironment(_make_test_index())
        text, anchor_map = env.get_node_text(
            "vid_L1_000_L2_000_L3_001", anchor=True,
        )
        assert anchor_map is not None
        assert not any(k.startswith("s") for k in anchor_map)


class TestGetChildrenInfo:
    """get_children_info 方法测试。"""

    def test_l1_has_children(self) -> None:
        """L1 节点应返回其 L2 子节点信息列表。"""
        env = TreeEnvironment(_make_test_index())
        children = env.get_children_info("vid_L1_000")
        assert len(children) == 1
        child = children[0]
        assert child["id"] == "vid_L1_000_L2_000"
        assert "time_range" in child
        assert "summary" in child
        assert isinstance(child["summary"], str)

    def test_l2_has_children(self) -> None:
        """L2 节点应返回其 L3 子节点信息列表。"""
        env = TreeEnvironment(_make_test_index())
        children = env.get_children_info("vid_L1_000_L2_000")
        assert len(children) == 2
        ids = [c["id"] for c in children]
        assert "vid_L1_000_L2_000_L3_000" in ids
        assert "vid_L1_000_L2_000_L3_001" in ids

    def test_l3_has_no_children(self) -> None:
        """L3 叶子节点应返回空列表。"""
        env = TreeEnvironment(_make_test_index())
        children = env.get_children_info("vid_L1_000_L2_000_L3_000")
        assert children == []

    def test_nonexistent_node_raises(self) -> None:
        """查询不存在的节点应抛出 KeyError。"""
        env = TreeEnvironment(_make_test_index())
        with pytest.raises(KeyError):
            env.get_children_info("nonexistent")

    def test_summary_truncation(self) -> None:
        """超过 120 字符的描述应被截断。"""
        index = _make_test_index()
        # 修改 L2 的事件描述为超长文本
        l2 = index.roots[0].children[0]
        long_desc = "A" * 200
        object.__setattr__(l2.card, "event_description", long_desc)
        env = TreeEnvironment(index)
        children = env.get_children_info("vid_L1_000")
        assert len(children[0]["summary"]) == 123  # 120 + "..."