"""AG-01~12: Agents 模块"""

import sys, os, json, tempfile
from pathlib import Path
from unittest.mock import MagicMock, patch
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..")))
from agents.llm import LLMClient
from agents.agent1_parser import Agent1Parser
from agents.agent2_data import Agent2Data
from agents.agent3_diagnostic import Agent3Diagnostic
from data.diff_result import FieldResult


def _llm_client(cache_dir=None):
    if cache_dir is None:
        cache_dir = tempfile.mkdtemp()
    return LLMClient(model="test", cache_dir=cache_dir)


def _mock_response(content="resp"):
    m = MagicMock()
    m.json.return_value = {"choices": [{"message": {"content": content}}]}
    m.raise_for_status.return_value = None
    return m


# ── AG-01~05: LLMClient ──

def test_llm_call_returns_string():
    """AG-01: call 返回字符串"""
    client = _llm_client()
    with patch("httpx.post", return_value=_mock_response("hello")):
        assert client.call([{"role": "user", "content": "hi"}]) == "hello"


def test_llm_cache_hit():
    """AG-02: 相同消息 → 缓存命中"""
    with tempfile.TemporaryDirectory() as tmp:
        client = _llm_client(tmp)
        with patch("httpx.post", return_value=_mock_response("resp1")):
            client.call([{"role": "user", "content": "ping"}])
        with patch("httpx.post") as mock_post:
            result = client.call([{"role": "user", "content": "ping"}])
            assert result == "resp1"
            mock_post.assert_not_called()


def test_llm_timeout():
    """AG-03: 超时 → 抛出异常"""
    client = _llm_client()
    with patch("httpx.post", side_effect=Exception("timeout")):
        import pytest
        with pytest.raises(Exception):
            client.call([{"role": "user", "content": "hi"}], retries=0)


def test_llm_retry_success():
    """AG-04: 首次失败, 重试成功"""
    with tempfile.TemporaryDirectory() as tmp:
        client = _llm_client(tmp)
        call_n = [0]
        def _side(*a, **kw):
            call_n[0] += 1
            if call_n[0] == 1:
                raise Exception("first fail")
            return _mock_response("ok")
        with patch("httpx.post", side_effect=_side):
            result = client.call([{"role": "user", "content": "retry"}], retries=1)
            assert result == "ok"


def test_llm_retry_exhausted():
    """AG-05: 重试用完 → 抛出"""
    client = _llm_client()
    with patch("httpx.post", side_effect=Exception("fail")):
        import pytest
        with pytest.raises(Exception):
            client.call([{"role": "user", "content": "x"}], retries=0)


# ── AG-06~08: Agent1Parser ──

def test_agent1_parse_valid():
    """AG-06: 合法 COPYBOOK 字段"""
    llm = MagicMock()
    llm.call.return_value = json.dumps({
        "fields": [
            {"name": "WS-A", "level": 5, "pic": "9(4)", "length": 4, "offset": 0},
        ]
    })
    tree = Agent1Parser(llm).parse("text")
    assert "WS-A" in tree.flatten()


def test_agent1_parse_bad_json():
    """AG-07: 非法 JSON → parse_error"""
    llm = MagicMock()
    llm.call.return_value = "not json"
    tree = Agent1Parser(llm).parse("x")
    assert tree.copybook_name == "parse_error"


def test_agent1_parse_empty():
    """AG-08: JSON 缺 fields"""
    llm = MagicMock()
    llm.call.return_value = json.dumps({})
    tree = Agent1Parser(llm).parse("x")
    assert len(tree.fields) >= 0


# ── AG-09~11: Agent2Data ──

def test_agent2_design_normal():
    """AG-09: 正常 → TestSuite"""
    llm = MagicMock()
    llm.call.return_value = json.dumps({"test_cases": [{"id": "TC-1", "fields": {"A": 1}}]})
    from data.field_tree import FieldTree, Field
    suite = Agent2Data(llm).design(FieldTree(fields=[Field(name="A", level=5, pic="9(4)")]))
    assert suite is not None


def test_agent2_design_fallback():
    """AG-10: LLM 返回非法 JSON → try/except 进入 fallback"""
    llm = MagicMock()
    llm.call.return_value = "not-json"
    from data.field_tree import FieldTree
    suite = Agent2Data(llm).design(FieldTree(fields=[]))
    # json.loads 抛出 JSONDecodeError, 被 except 捕获, 返回 TC-FALLBACK
    assert len(suite.test_cases) >= 1
    assert suite.test_cases[0].id == "TC-FALLBACK"


def test_agent2_design_spark():
    """AG-11: spark_mode → SparkConfig"""
    llm = MagicMock()
    llm.call.return_value = json.dumps({"test_cases": []})
    from data.field_tree import FieldTree
    suite = Agent2Data(llm).design(FieldTree(fields=[]), spark_mode=True)
    assert suite.has_spark is True


# ── AG-12: Agent3Diagnostic ──

def test_agent3_analyze():
    """AG-12: MISMATCH → 诊断"""
    llm = MagicMock()
    llm.call.return_value = "rounding error"
    fr = FieldResult(field_name="BR-AMT", status="MISMATCH",
                     cobol_value="1500000", java_value="1499999.99")
    r = Agent3Diagnostic(llm).analyze(fr)
    assert isinstance(r, str) and len(r) > 0