"""src/wov_app/routers/workflows.py 的模块级测试（数据 → 测试过程 → 验证结果）。

被测模块：`src/wov_app/routers/workflows.py`（管理端 API：工作流 CRUD、
校验、发布、版本历史），可独立调用。用例通过真实 TestClient 走 HTTP 链路，
数据库为临时 SQLite。
"""

from __future__ import annotations

from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from wov_app.main import app as fastapi_app


@pytest.fixture()
def client(tmp_path: Path, monkeypatch) -> TestClient:
    """构造隔离数据库与存储的真实 TestClient。"""
    monkeypatch.setattr("wov_app.config.DB_PATH", tmp_path / "wov.db")
    monkeypatch.setattr("wov_app.config.STORAGE_DIR", tmp_path / "storage")
    monkeypatch.setattr("wov_app.main.DB_PATH", tmp_path / "wov.db")
    monkeypatch.setattr("wov_app.main.STORAGE_DIR", tmp_path / "storage")
    monkeypatch.setenv("WOV_AUTO_SEED", "0")
    monkeypatch.setenv("WOV_SCHEDULER_ENABLED", "0")
    monkeypatch.setenv("WOV_CLEANUP_ENABLED", "0")
    monkeypatch.setenv("WOV_BATCH_ENABLED", "0")
    with TestClient(fastapi_app) as test_client:
        yield test_client


def _definition(name: str = "echo-flow", nodes: list[dict] | None = None, edges: list[dict] | None = None) -> dict:
    """构造合法 DAG 定义（默认单 echo 节点）。"""
    return {
        "name": name,
        "version": 1,
        "nodes": nodes or [
            {"id": "step", "node_type": "echo", "inputs": {"file_uri": "input.video_uri"}},
        ],
        "edges": edges or [],
        "entry_inputs": {"video_uri": "file"},
        "final_outputs": {"result": "step.file_uri"},
    }


def _create(client: TestClient, workflow_id: str = "wf", definition: dict | None = None) -> dict:
    """创建一个工作流并返回响应体。"""
    response = client.post("/api/admin/workflows", json={
        "id": workflow_id, "name": "测试流程", "description": "说明",
        "definition": definition or _definition(),
    })
    assert response.status_code == 200, response.text
    return response.json()


# ---------------------------------------------------------------------------
# 创建与读取
# ---------------------------------------------------------------------------


def test_create_workflow_saves_first_version(client: TestClient) -> None:
    """创建工作流保存为 v1，初始未发布。"""
    # 数据：合法定义。
    # 测试过程
    created = _create(client, "wf-1")

    # 验证结果
    assert created["id"] == "wf-1"
    assert created["latest_version"] == 1
    assert created["published"] is False


def test_create_workflow_appends_new_version(client: TestClient) -> None:
    """对已存在工作流再次创建 → 追加新版本（保存即新版本）。"""
    # 数据：同一 ID 两次创建。
    _create(client, "wf-1")

    # 测试过程
    second = _create(client, "wf-1")

    # 验证结果：版本递增。
    assert second["latest_version"] == 2


def test_get_workflow_returns_latest_definition(client: TestClient) -> None:
    """详情返回最新版本定义（供编排页加载编辑）。"""
    # 数据：已创建工作流。
    _create(client, "wf-1")

    # 测试过程
    detail = client.get("/api/admin/workflows/wf-1")

    # 验证结果
    assert detail.status_code == 200
    body = detail.json()
    assert body["latest_version_data"]["version"] == 1
    assert body["latest_version_data"]["definition"]["nodes"][0]["id"] == "step"


def test_get_missing_workflow_returns_404(client: TestClient) -> None:
    """不存在的工作流返回 404。"""
    # 数据：未创建。
    # 测试过程与验证结果
    assert client.get("/api/admin/workflows/nope").status_code == 404


def test_list_workflows(client: TestClient) -> None:
    """列表返回全部工作流概要。"""
    # 数据：两个工作流。
    _create(client, "wf-1")
    _create(client, "wf-2")

    # 测试过程
    listed = client.get("/api/admin/workflows").json()

    # 验证结果
    assert {item["id"] for item in listed} == {"wf-1", "wf-2"}


# ---------------------------------------------------------------------------
# 校验：拒绝非法 DAG
# ---------------------------------------------------------------------------


def test_create_rejects_cycle(client: TestClient) -> None:
    """环形 DAG 保存被拒（422），不产生工作流记录（R04）。"""
    # 数据：A→B→A 的环形定义。
    cyclic = _definition(nodes=[
        {"id": "a", "node_type": "echo", "inputs": {"file_uri": "b.file_uri"}},
        {"id": "b", "node_type": "echo", "inputs": {"file_uri": "a.file_uri"}},
    ], edges=[{"from": "a", "to": "b"}, {"from": "b", "to": "a"}])

    # 测试过程
    response = client.post("/api/admin/workflows", json={
        "id": "wf-cycle", "name": "环形", "description": "", "definition": cyclic,
    })

    # 验证结果：422，且未写库。
    assert response.status_code == 422
    assert client.get("/api/admin/workflows/wf-cycle").status_code == 404


def test_create_rejects_self_loop(client: TestClient) -> None:
    """自环（节点指向自己）同样被拒绝。"""
    # 数据：单节点自环。
    loop = _definition(
        nodes=[{"id": "a", "node_type": "echo", "inputs": {"file_uri": "a.file_uri"}}],
        edges=[{"from": "a", "to": "a"}],
    )

    # 测试过程
    response = client.post("/api/admin/workflows", json={
        "id": "wf-loop", "name": "自环", "description": "", "definition": loop,
    })

    # 验证结果
    assert response.status_code == 422


def test_create_rejects_edge_to_unknown_node(client: TestClient) -> None:
    """边引用不存在的节点被拒绝。"""
    # 数据：边指向 ghost 节点。
    bad = _definition(edges=[{"from": "step", "to": "ghost"}])

    # 测试过程
    response = client.post("/api/admin/workflows", json={
        "id": "wf-bad", "name": "坏边", "description": "", "definition": bad,
    })

    # 验证结果
    assert response.status_code == 422


def test_create_rejects_duplicate_node_ids(client: TestClient) -> None:
    """节点 ID 重复被拒绝。"""
    # 数据：两个同 ID 节点。
    dup = _definition(nodes=[
        {"id": "step", "node_type": "echo", "inputs": {}},
        {"id": "step", "node_type": "echo", "inputs": {}},
    ])

    # 测试过程
    response = client.post("/api/admin/workflows", json={
        "id": "wf-dup", "name": "重复", "description": "", "definition": dup,
    })

    # 验证结果
    assert response.status_code == 422


def test_validate_endpoint_returns_node_ids(client: TestClient) -> None:
    """校验接口对合法定义返回 valid 与节点 ID 列表（不保存）。"""
    # 数据：已创建工作流 + 待校验定义。
    _create(client, "wf-1")

    # 测试过程
    response = client.post("/api/admin/workflows/wf-1/validate", json=_definition())

    # 验证结果
    assert response.status_code == 200
    assert response.json() == {"valid": True, "node_ids": ["step"]}


def test_validate_endpoint_rejects_cycle(client: TestClient) -> None:
    """校验接口对环形定义返回 422。"""
    # 数据：环形定义。
    _create(client, "wf-1")
    cyclic = _definition(nodes=[
        {"id": "a", "node_type": "echo", "inputs": {"file_uri": "b.file_uri"}},
        {"id": "b", "node_type": "echo", "inputs": {"file_uri": "a.file_uri"}},
    ], edges=[{"from": "a", "to": "b"}, {"from": "b", "to": "a"}])

    # 测试过程与验证结果
    assert client.post("/api/admin/workflows/wf-1/validate", json=cyclic).status_code == 422


# ---------------------------------------------------------------------------
# 发布与版本
# ---------------------------------------------------------------------------


def test_publish_marks_workflow_published(client: TestClient) -> None:
    """发布后工作流标记为已发布（出现在用户应用中心）。"""
    # 数据：已创建工作流。
    _create(client, "wf-1")

    # 测试过程
    response = client.post("/api/admin/workflows/wf-1/publish")
    detail = client.get("/api/admin/workflows/wf-1").json()

    # 验证结果
    assert response.status_code == 200
    assert detail["published"] == 1


def test_publish_rejects_legacy_cycle_version(client: TestClient) -> None:
    """历史遗留的环形版本无法发布（发布前重新校验，R04）。"""
    # 数据：绕过创建校验，直接写入环形版本（模拟历史数据）。
    _create(client, "wf-1")
    db = client.app.state.db
    cyclic = _definition(nodes=[
        {"id": "a", "node_type": "echo", "inputs": {"file_uri": "b.file_uri"}},
        {"id": "b", "node_type": "echo", "inputs": {"file_uri": "a.file_uri"}},
    ], edges=[{"from": "a", "to": "b"}, {"from": "b", "to": "a"}])
    db.create_workflow_version("wf-1", 9, cyclic)

    # 测试过程
    response = client.post("/api/admin/workflows/wf-1/publish")

    # 验证结果：被拒绝。
    assert response.status_code == 422


def test_publish_rejects_workflow_without_version(client: TestClient) -> None:
    """无版本的工作流不能发布。"""
    # 数据：只有工作流记录，无版本（绕过创建接口）。
    db = client.app.state.db
    db.upsert_workflow({"id": "empty", "name": "空", "description": "", "latest_version": 0})

    # 测试过程
    response = client.post("/api/admin/workflows/empty/publish")

    # 验证结果
    assert response.status_code == 422


def test_list_versions_returns_history_desc(client: TestClient) -> None:
    """版本历史按版本号倒序返回，供对比与回滚。"""
    # 数据：两个版本。
    _create(client, "wf-1")
    _create(client, "wf-1")

    # 测试过程
    versions = client.get("/api/admin/workflows/wf-1/versions").json()

    # 验证结果
    assert [item["version"] for item in versions] == [2, 1]


def test_delete_workflow_removes_it(client: TestClient) -> None:
    """删除工作流后查询 404。"""
    # 数据：已创建工作流。
    _create(client, "wf-1")

    # 测试过程
    response = client.delete("/api/admin/workflows/wf-1")

    # 验证结果
    assert response.status_code == 200
    assert client.get("/api/admin/workflows/wf-1").status_code == 404


def test_delete_missing_workflow_returns_404(client: TestClient) -> None:
    """删除不存在的工作流返回 404。"""
    # 数据：未创建。
    # 测试过程与验证结果
    assert client.delete("/api/admin/workflows/nope").status_code == 404


def test_created_workflow_id_slugified_from_name_when_absent(client: TestClient) -> None:
    """未给 ID 时由名称生成 slug 形式 ID（管理端便利行为）。"""
    # 数据：只给名称。
    # 测试过程
    response = client.post("/api/admin/workflows", json={
        "name": "My Cool Flow", "description": "", "definition": _definition(),
    })

    # 验证结果
    assert response.status_code == 200
    assert response.json()["id"] == "my-cool-flow"