"""T3 ArchitectClient 单测（封闭：httpx.MockTransport 注入，D11）。"""
import json

import httpx
import pytest

from router_system.architect import (
    ArchitectCircuitBreaker,
    ArchitectClient,
    ArchitectError,
    build_architect,
)
from router_system.workspace import Workspace

BRIEF_JSON = json.dumps({
    "goal": "实现快排",
    "constraints": ["标准库"],
    "tags": ["code"],
    "acceptance": [{"id": "a1", "check": "排序正确", "machine_checkable": True}],
    "plan": [{"id": "s1", "task": "实现", "deps": [], "done_criteria": "可运行"}],
}, ensure_ascii=False)

DECIDE_JSON = json.dumps({"reply": "改用断言", "patch_plan": [{"id": "s2", "task": "修"}]}, ensure_ascii=False)
REVIEW_JSON = json.dumps({"verdict": "done", "notes": "通过", "fix_issues": []}, ensure_ascii=False)


def _make_client(handler, api_key="test-key", **kw):
    transport = httpx.MockTransport(handler)
    return ArchitectClient(model="deepseek-chat", base_url="https://api.deepseek.com/v1",
                           api_key=api_key, transport=transport, **kw)


def _resp_json(content, usage=None):
    return httpx.Response(200, json={
        "choices": [{"message": {"content": content}}],
        "usage": usage or {"prompt_tokens": 100, "completion_tokens": 20},
    })


def _ws(**kw):
    return Workspace.new(request_id="a1b2c3d4e5f6", query=kw.get("query", "写个快排"),
                         api_token_cap=kw.get("cap", 8000), rounds_cap=kw.get("rounds", 6))


# ---------- brief 成功 ----------
def test_brief_success_records_budget():
    calls = []
    def handler(request):
        calls.append(request.url.path)
        return _resp_json(BRIEF_JSON)
    client = _make_client(handler)
    ws = _ws()
    brief = asyncio_run(client.brief("写个快排", ws))
    assert brief["goal"] == "实现快排"
    assert brief["plan"][0]["id"] == "s1"
    assert calls == ["/v1/chat/completions"]
    # token 计量回写
    assert ws.budget()["api_input_tokens"] == 100
    assert ws.budget()["api_output_tokens"] == 20


# ---------- 缺 key ----------
def test_no_key_raises():
    client = ArchitectClient(model="deepseek-chat", api_key=None)
    ws = _ws()
    with pytest.raises(ArchitectError):
        asyncio_run(client.brief("hi", ws))


# ---------- 坏 JSON 重试一次成功 ----------
def test_bad_json_retry_once_success():
    seq = [{"body": "不是json{{", "ok": False}, {"body": BRIEF_JSON, "ok": True}]
    calls = []
    def handler(request):
        calls.append(1)
        item = seq[len(calls) - 1]
        return _resp_json(item["body"])
    client = _make_client(handler)
    ws = _ws()
    brief = asyncio_run(client.brief("hi", ws))
    assert len(calls) == 2
    assert brief["goal"] == "实现快排"


# ---------- 坏 JSON 两次失败 ----------
def test_bad_json_twice_raises():
    def handler(request):
        return _resp_json("垃圾输出{")
    client = _make_client(handler)
    ws = _ws()
    with pytest.raises(ArchitectError):
        asyncio_run(client.brief("hi", ws))


# ---------- API 错误（非 2xx） ----------
def test_http_error_raises():
    def handler(request):
        return httpx.Response(500, text="server error")
    client = _make_client(handler)
    ws = _ws()
    with pytest.raises(ArchitectError):
        asyncio_run(client.brief("hi", ws))


# ---------- 缺 choices ----------
def test_missing_choices_raises():
    def handler(request):
        return httpx.Response(200, json={"usage": {}})
    client = _make_client(handler)
    ws = _ws()
    with pytest.raises(ArchitectError):
        asyncio_run(client.brief("hi", ws))


# ---------- 熔断：预算触顶，不再调用 transport ----------
def test_circuit_breaker_before_transport():
    called = []
    def handler(request):
        called.append(1)
        return _resp_json(BRIEF_JSON)
    client = _make_client(handler)
    ws = _ws(cap=1)
    ws.add_budget(input_tokens=1, output_tokens=0)  # used=1 >= cap=1
    with pytest.raises(ArchitectCircuitBreaker):
        asyncio_run(client.brief("hi", ws))
    assert called == []  # 未触达 API


# ---------- decide / final_review ----------
def test_decide():
    def handler(request):
        return _resp_json(DECIDE_JSON)
    client = _make_client(handler)
    ws = _ws()
    ws.apply_brief({"goal": "x", "constraints": [], "tags": ["code"],
                    "acceptance": [], "plan": [{"id": "s1", "task": "t", "deps": [], "done_criteria": "c"}]})
    ws.add_issue("s1", "a://f.py#L1", "obs", "exp", "try", "ask")
    out = asyncio_run(client.decide(ws))
    assert out["reply"] == "改用断言"


def test_final_review_done():
    def handler(request):
        return _resp_json(REVIEW_JSON)
    client = _make_client(handler)
    ws = _ws()
    ws.apply_brief({"goal": "x", "constraints": [], "tags": ["code"],
                    "acceptance": [], "plan": [{"id": "s1", "task": "t", "deps": [], "done_criteria": "c"}]})
    out = asyncio_run(client.final_review(ws))
    assert out["verdict"] == "done"


# ---------- build_architect 工厂 ----------
def test_build_architect_reads_env(monkeypatch):
    cfg = {"model": "deepseek-chat", "api_key_env": "DEEPSEEK_API_KEY"}
    client = build_architect(cfg, get_env=lambda name: "sk-fake")
    assert client.api_key == "sk-fake"


def test_build_architect_no_key():
    cfg = {"api_key_env": "DEEPSEEK_API_KEY"}
    client = build_architect(cfg, get_env=lambda name: None)
    assert client.api_key is None


# ---------- 小工具 ----------
def asyncio_run(coro):
    import asyncio
    return asyncio.run(coro)