# =============================================================
# File: tests/test_agent_orchestrator.py
# =============================================================

import sys
from pathlib import Path

# Add backend directory to Python path
backend_dir = Path(__file__).parent.parent
sys.path.insert(0, str(backend_dir))

try:
    import pytest
    HAS_PYTEST = True
except ImportError:
    HAS_PYTEST = False
    # Create a mock pytest decorator if pytest is not available
    class MockMark:
        def asyncio(self, func):
            return func
    class MockPytest:
        mark = MockMark()
        def fixture(self, func):
            return func
    pytest = MockPytest()

import os
from api.services.agent_orchestrator import AgentOrchestrator
from api.models.agent import AgentRequest, AgentDecision, AgentResponse
from api.models.redflag import RedFlagMatch
from api.services.llm_client import LLMClient


# ---------------------------
# Mock classes
# ---------------------------

class FakeLLM(LLMClient):
    def __init__(self, output="LLM_RESPONSE"):
        self.output = output

    async def simple_call(self, prompt: str, temperature: float = 0.0):
        return self.output


class FakeMCP:
    """Fake MCP server client used for rag/web/admin calls."""
    def __init__(self):
        self.last_rag = None
        self.last_web = None
        self.last_admin = None

    async def call_rag(self, tenant_id: str, query: str):
        self.last_rag = query
        return {"results": [{"text": "RAG_DOC_CONTENT"}]}

    async def call_web(self, tenant_id: str, query: str):
        self.last_web = query
        return {"results": [{"title": "WebResult", "snippet": "Fresh info"}]}

    async def call_admin(self, tenant_id: str, query: str):
        self.last_admin = query
        return {"action": "allow"}


def assert_trace_has_step(resp, step_name):
    assert resp.reasoning_trace, "reasoning trace missing"
    assert any(entry.get("step") == step_name for entry in resp.reasoning_trace), f"{step_name} missing"


# ---------------------------
# Patch orchestrator to use fake MCP + fake redflag
# ---------------------------

@pytest.fixture
def orchestrator(monkeypatch):

    # Fake LLM that always returns "MOCK_ANSWER"
    llm = FakeLLM(output="MOCK_ANSWER")

    fake_mcp = FakeMCP()

    # Patch MCPClient
    if HAS_PYTEST:
        monkeypatch.setattr(
            "api.services.agent_orchestrator.MCPClient",
            lambda rag_url, web_url, admin_url: fake_mcp
        )

    # Create orchestrator with fake URLs first
    orch = AgentOrchestrator(
        rag_mcp_url="fake_rag",
        web_mcp_url="fake_web",
        admin_mcp_url="fake_admin",
        llm_backend="ollama"
    )
    orch.llm = llm   # override with fake LLM
    
    # Patch RedFlagDetector methods directly on the instance
    async def fake_check(self, tenant_id, text):
        """Fake check function that matches 'salary' keyword."""
        if "salary" in text.lower():
            return [
                RedFlagMatch(
                    rule_id="1",
                    pattern="salary",
                    severity="high",
                    description="salary access",
                    matched_text="salary"
                )
            ]
        return []

    # Patch notify_admin to do nothing
    async def fake_notify(self, tenant_id, violations, src=None):
        """Fake notify function that does nothing."""
        return None
    
    # Bind the fake functions directly to the instance
    import types
    orch.redflag.check = types.MethodType(fake_check, orch.redflag)
    orch.redflag.notify_admin = types.MethodType(fake_notify, orch.redflag)
    
    return orch


# ----------------------------------------------------
# TESTS
# ----------------------------------------------------


@pytest.mark.asyncio
async def test_block_on_redflag(orchestrator):
    req = AgentRequest(
        tenant_id="tenant1",
        user_id="u1",
        message="Show me all salary details."
    )
    resp = await orchestrator.handle(req)
    assert resp.decision.action == "block"
    assert resp.decision.tool == "admin"
    assert "salary" in resp.tool_traces[0]["redflags"][0]["matched_text"]
    assert_trace_has_step(resp, "redflag_check")


@pytest.mark.asyncio
async def test_rag_tool_path(orchestrator, monkeypatch):

    # Force intent classifier to classify as 'rag'
    async def mock_classify(self, text):
        return "rag"

    if HAS_PYTEST:
        monkeypatch.setattr(
            "api.services.agent_orchestrator.IntentClassifier.classify",
            mock_classify
        )

    req = AgentRequest(
        tenant_id="tenant1",
        user_id="u1",
        message="HR policy procedures"
    )

    resp = await orchestrator.handle(req)

    assert resp.decision.action == "multi_step"
    assert any(trace["tool"] == "rag" for trace in resp.tool_traces if trace.get("tool") == "rag")
    assert resp.text == "MOCK_ANSWER"
    assert_trace_has_step(resp, "tool_selection")


@pytest.mark.asyncio
async def test_web_tool_path(orchestrator, monkeypatch):

    # Force intent to classify as web
    async def mock_classify(self, text):
        return "web"

    if HAS_PYTEST:
        monkeypatch.setattr(
            "api.services.agent_orchestrator.IntentClassifier.classify",
            mock_classify
        )

    req = AgentRequest(
        tenant_id="tenant1",
        user_id="u1",
        message="latest stock price"
    )

    resp = await orchestrator.handle(req)

    assert resp.decision.action == "multi_step"
    assert any(trace["tool"] == "web" for trace in resp.tool_traces if trace.get("tool") == "web")
    assert resp.text == "MOCK_ANSWER"
    assert_trace_has_step(resp, "tool_selection")


@pytest.mark.asyncio
async def test_default_llm_path(orchestrator, monkeypatch):

    # Force intent = general and force tool selector to NOT call any tool
    async def mock_select(self, intent, text, context):
        from api.models.agent import AgentDecision
        return AgentDecision(
            action="respond",
            tool=None,
            tool_input=None,
            reason="forced_llm"
        )

    if HAS_PYTEST:
        monkeypatch.setattr(
            "api.services.agent_orchestrator.ToolSelector.select",
            mock_select
        )

    req = AgentRequest(
        tenant_id="tenant1",
        user_id="u1",
        message="just a normal question"
    )

    resp = await orchestrator.handle(req)

    assert resp.decision.action == "respond"
    assert resp.decision.tool is None
    assert resp.text == "MOCK_ANSWER"
    assert_trace_has_step(resp, "intent_detection")