"""作业 6：应用服务四接口组合测试。

验收演示对应（计划作业 6）：
创建会话 -> set_info 写车牌 -> get_info 读回 -> chat 使用车牌继续核实
-> 分组读值 -> 删除 -> 再读与再次聊天均不泄漏旧数据。

spy 断言：set_info / get_info / delete_session 全程零模型调用。
"""

import json

import pytest

from src.backends.chat import ChatResult, TextDelta, FormUpdate
from src.services.app_service import AccidentAppService, SET_INFO_INVALID_KEY_MSG
from src.services.repository import InMemorySessionRepository


class SpyBackend:
    """记录调用的 ChatBackend 替身；form_update 模拟图产出的字段差量。"""

    def __init__(self, form_update=None):
        self.calls = []           # complete 收到的 ChatInput
        self.stream_calls = []
        self._form_update = form_update or {}
        # 用调用次数当“模型调用”spy：真实 backend 每次 complete 至少一次 LLM
        self.llm_calls = 0

    async def complete(self, chat_input):
        self.calls.append(chat_input)
        self.llm_calls += 1
        return ChatResult(
            content="<state>1002</state>收到",
            status_code=None,
            form_update=dict(self._form_update),
        )

    async def stream(self, chat_input):
        self.stream_calls.append(chat_input)
        self.llm_calls += 1
        yield TextDelta("<state>1002</state>")
        if self._form_update:
            yield FormUpdate(dict(self._form_update))
        yield TextDelta("收到")


def make_service(form_update=None):
    backend = SpyBackend(form_update=form_update)
    service = AccidentAppService(backend, InMemorySessionRepository())
    return service, backend


# ---- set/get：白名单、分组、外部表示 ----

def test_set_then_get_single_key_roundtrip():
    service, backend = make_service()
    code, msg = service.set_info("s1", "hphm1", "苏B12345")
    assert (code, msg) == ("200", "")
    assert json.loads(service.get_info("s1", "hphm1")) == "苏B12345"
    # set/get 零模型调用
    assert backend.llm_calls == 0


def test_get_groups_match_existing_contract():
    service, _ = make_service()
    service.set_info("s1", "ywrysw", "0")       # False
    service.set_info("s1", "jdcsl", "0")        # int 0
    service.set_info("s1", "xm2", "张三")

    acd = json.loads(service.get_info("s1", "acdinfo"))
    assert acd["ywrysw"] == "0"      # False -> "0"
    assert acd["jdcsl"] == "0"       # int 0 -> "0"（内部类型不同）
    assert acd["sgyy"] == ""         # 未知 -> 空串

    human2 = json.loads(service.get_info("s1", "acdhuman2"))
    assert human2["xm2"] == "张三"
    assert human2["sfzmwh2"] == ""   # 全字段齐全，未填为空

    all_groups = json.loads(service.get_info("s1", "all"))
    assert set(all_groups) == {"acdinfo", "acdhuman1", "acdhuman2"}


def test_get_unknown_key_returns_json_empty_string():
    """兼容现状：未知 key 返回 JSON 空串 '""'。"""
    service, _ = make_service()
    service.set_info("s1", "hphm1", "苏B12345")
    assert service.get_info("s1", "no_such_key") == '""'
    assert service.get_info("ghost-session", "hphm1") == '""'


def test_set_unknown_or_internal_key_rejected():
    service, backend = make_service()
    code, msg = service.set_info("s1", "no_such_key", "x")
    assert code == "500" and msg == SET_INFO_INVALID_KEY_MSG
    code, _ = service.set_info("s1", "stage_code", "1002")
    assert code == "500"          # 内部字段保护
    assert service.get_info("s1", "hphm1") == '""'   # 未被污染
    assert backend.llm_calls == 0


def test_set_rejects_unparsable_value():
    service, _ = make_service()
    code, msg = service.set_info("s1", "ywrysw", "maybe")
    assert code == "500" and "无法解析" in msg


# ---- chat：注入 + 写回 ----

@pytest.mark.asyncio
async def test_chat_sees_set_info_values_and_writes_back_patch():
    """set_info 写入 -> chat 输入注入 -> 图差量写回 -> get_info 读到。"""
    service, backend = make_service(form_update={"ywrysw": False})
    service.set_info("s1", "hphm1", "苏B12345")
    service.set_info("s1", "xm2", "李四")

    result = await service.chat(
        _input("s1", "我是刚才报警的驾驶员")
    )
    assert result.content == "<state>1002</state>收到"

    # 图输入必须携带 repository 最新业务字段（车牌供核实使用）
    injected = backend.calls[0].injected_fields
    assert injected["person_fields"]["hphm1"] == "苏B12345"
    assert injected["person_fields"]["xm2"] == "李四"

    # 图产出的差量写回 repository，get_info 立即可读
    assert json.loads(service.get_info("s1", "acdinfo"))["ywrysw"] == "0"
    assert json.loads(service.get_info("s1", "hphm1")) == "苏B12345"


@pytest.mark.asyncio
async def test_chat_form_patch_mapped_to_business_keys():
    """图表单键差量经映射写回业务键（作业 6 映射的端到端）。"""
    service, backend = make_service(form_update={
        "has_injury": False, "vehicle_count": 2, "accident_cause": "追尾",
    })
    await service.chat(_input("s1", "两辆汽车追尾，没有人受伤"))
    acd = json.loads(service.get_info("s1", "acdinfo"))
    assert acd["ywrysw"] == "0"
    assert acd["jdcsl"] == "2"
    assert acd["sgyy"] == "追尾"
    # 表单键本身不落 repository（未知业务键 -> JSON 空串）
    assert json.loads(service.get_info("s1", "has_injury")) == ""


@pytest.mark.asyncio
async def test_set_info_acd_value_mapped_into_form_injection():
    """set_info 写业务键 -> chat 注入为图表单键（反向映射）。"""
    service, backend = make_service()
    service.set_info("s1", "ywrysw", "0")
    service.set_info("s1", "jdcsl", "2")
    service.set_info("s1", "bjrjs", "1")   # 无表单来源，不注入
    await service.chat(_input("s1", "继续办理"))
    injected = backend.calls[0].injected_fields
    assert injected["accident_fields"] == {"has_injury": False, "vehicle_count": 2}


@pytest.mark.asyncio
async def test_chat_without_business_state_passes_no_injection():
    service, backend = make_service()
    await service.chat(_input("fresh-session", "你好"))
    assert backend.calls[0].injected_fields is None


@pytest.mark.asyncio
async def test_stream_injects_fields_writes_back_form_update():
    """流式：注入同 chat；FormUpdate 事件差量捕获写回后透传。"""
    service, backend = make_service(form_update={"has_injury": False})
    service.set_info("s1", "xm1", "王五")
    events = [
        event async for event in service.stream(_input("s1", "继续办理"))
    ]
    kinds = [type(event).__name__ for event in events]
    assert kinds == ["TextDelta", "FormUpdate", "TextDelta"]
    assert backend.stream_calls[0].injected_fields["person_fields"]["xm1"] == "王五"
    # FormUpdate 差量已写回 repository（表单键 -> 业务键）
    assert json.loads(service.get_info("s1", "acdinfo"))["ywrysw"] == "0"


# ---- delete：清理 + 幂等 ----

@pytest.mark.asyncio
async def test_delete_clears_business_state_and_is_idempotent():
    drops = []

    async def drop_checkpoint(session_id):
        drops.append(session_id)

    service, backend = make_service()
    service.set_info("s1", "hphm1", "苏B12345")
    await service.chat(_input("s1", "你好"))

    await service.delete_session("s1", drop_checkpoint=drop_checkpoint)
    assert drops == ["s1"]
    # 再读为空、再聊天不注入旧数据
    assert service.get_info("s1", "hphm1") == '""'
    await service.chat(_input("s1", "还在吗"))
    assert backend.calls[-1].injected_fields is None

    # 重复删除固定行为：成功返回；checkpoint 清理会再次触发，
    # 但缺失时静默容忍（幂等语义由 drop_checkpoint 内部保证）
    await service.delete_session("s1", drop_checkpoint=drop_checkpoint)
    assert drops == ["s1", "s1"]
    assert backend.llm_calls == 2   # 两次 chat 各一次；set/get/delete 零调用


@pytest.mark.asyncio
async def test_delete_tolerates_missing_checkpoint():
    async def missing(_session_id):
        raise RuntimeError("no such thread")

    service, _ = make_service()
    service.set_info("s1", "xm1", "王五")
    # checkpoint 不存在视为删除成功的一部分，不向上抛
    await service.delete_session("s1", drop_checkpoint=missing)
    assert service.get_info("s1", "xm1") == '""'


def _input(session_id, text):
    from src.backends.chat import ChatInput

    return ChatInput(session_id=session_id, text=text, client_mode="direct")