from types import SimpleNamespace
from uuid import uuid4

from fastapi.testclient import TestClient

import app.api.advisor_script_templates as templates_api
from app.advisor_db import AgentSessionLocal
from app.main import app
from app.model.entities_advisor import ScriptTemplate
from app.model.advisor_schemas import AuthContext
from app.repository.script_template_repository import ScriptTemplateRepository
from app.service.script_template_service import ScriptTemplateService
from app.service.script_template_vector_service import TemplateVectorError

client = TestClient(app)

def advisor_auth() -> AuthContext:
    return AuthContext(
        user_id="advisor_test",
        display_name="Advisor Test",
        roles=["advisor"],
        permissions=["template:read"],
        trace_id=f"trace-hybrid-{uuid4().hex}",
        advisor_id="ADV-TEST-001",
    )

def token_for(username: str, password: str) -> str:
    response = client.post(
        "/api/v1/auth/login",
        json={"username": username, "password": password},
    )
    assert response.status_code == 200
    return response.json()["data"]["access_token"]

def create_approved_template(
    *,
    title: str,
    content: str,
    usage_count: int = 0,
    scene: str = "loss_comfort",
    created_by: str | None = None,
) -> ScriptTemplate:
    actor = created_by or f"test:hybrid_search:{uuid4().hex}"
    with AgentSessionLocal() as session:
        template = ScriptTemplate(
            scene=scene,
            customer_type="C3",
            title=title,
            content=content,
            tags=["安抚", "市场波动"],
            embedding_id=f"tpl_test_{uuid4().hex[:8]}",
            is_approved=True,
            approved_by="compliance_test",
            is_active=True,
            version=1,
            usage_count=usage_count,
            created_by=actor,
            updated_by=actor,
        )
        session.add(template)
        session.commit()
        session.refresh(template)
        session.expunge(template)
        return template

class FakeHybridVectorService:
    def __init__(self, hits: list[SimpleNamespace]) -> None:
        self.hits = hits
        self.calls: list[dict] = []

    def search_templates(self, *, query: str, scene: str | None, top_k: int):
        self.calls.append({"query": query, "scene": scene, "top_k": top_k})
        return self.hits

class FailingVectorService:
    def search_templates(self, *, query: str, scene: str | None, top_k: int):
        raise TemplateVectorError("milvus unavailable")

def test_template_search_merges_keyword_and_vector_hits_with_score_order():
    keyword = create_approved_template(
        title="客户情绪安抚话术",
        content="您好，短期波动不代表长期趋势，请先看风险揭示材料。",
        usage_count=1,
    )
    semantic = create_approved_template(
        title="市场波动沟通话术",
        content="您好，近期净值回撤来自市场波动，可以先复盘持仓结构。",
        usage_count=0,
    )
    vector_service = FakeHybridVectorService(
        [
            SimpleNamespace(template_id=semantic.id, score=0.95),
            SimpleNamespace(template_id=keyword.id, score=0.80),
        ]
    )
    service = ScriptTemplateService(repository=ScriptTemplateRepository(), vector_service=vector_service)

    result = service.search_templates(auth=advisor_auth(), q="客户情绪安抚", top_k=3)

    ids = [item.id for item in result.items]
    assert ids[0] == semantic.id
    assert keyword.id in ids
    assert result.items[0].match_type == "semantic"
    assert all(item.score <= 1.0 for item in result.items)
    assert vector_service.calls == [{"query": "客户情绪安抚", "scene": None, "top_k": 3}]

def test_template_search_api_falls_back_to_keyword_when_vector_unavailable(monkeypatch):
    suffix = uuid4().hex[:8]
    query = f"跌幅沟通关键词{suffix}"
    template = create_approved_template(
        title=f"{query}模板",
        content="您好，产品净值短期有波动，请结合自身风险承受能力理性看待。",
    )
    monkeypatch.setattr(
        templates_api,
        "template_service",
        ScriptTemplateService(repository=ScriptTemplateRepository(), vector_service=FailingVectorService()),
    )
    token = token_for("advisor_test", "advisor_test")

    response = client.get(
        "/api/advisor-agent/script-templates/search",
        params={"q": query},
        headers={"Authorization": f"Bearer {token}"},
    )

    assert response.status_code == 200
    items = response.json()["data"]["items"]
    assert items[0]["id"] == template.id
    assert items[0]["match_type"] == "keyword"