"""Unit tests for services.classifier_io — parser and router-JSON guard.

These are pure-function tests. They run without bootstrapping the rest of
the worker's imports.
"""

from __future__ import annotations

from services.classifier_io import looks_like_router_json, parse_classification


# ---------- parse_classification ----------


def test_empty_raw_returns_classification_failed():
    result = parse_classification("")
    assert result["action"] == "classification_failed"
    assert result["response"] == ""
    assert result["prompt"] == ""


def test_whitespace_only_returns_classification_failed():
    assert parse_classification("   \n\t  ")["action"] == "classification_failed"


def test_none_returns_classification_failed():
    assert parse_classification(None)["action"] == "classification_failed"  # type: ignore[arg-type]


def test_non_json_text_returns_classification_failed():
    assert parse_classification("그냥 평범한 답변입니다.")["action"] == "classification_failed"


def test_json_without_action_key_returns_classification_failed():
    assert parse_classification('{"foo": "bar", "baz": 1}')["action"] == "classification_failed"


def test_invalid_json_returns_classification_failed():
    assert parse_classification('{"action": "direct", broken')["action"] == "classification_failed"


def test_non_dict_json_returns_classification_failed():
    assert parse_classification("[1, 2, 3]")["action"] == "classification_failed"


def test_valid_direct_returns_unchanged():
    raw = '{"action": "direct", "response": "안녕!", "prompt": ""}'
    result = parse_classification(raw)
    assert result["action"] == "direct"
    assert result["response"] == "안녕!"


def test_valid_route_returns_unchanged():
    raw = '{"action": "route", "response": "분석 중", "prompt": "양자역학 설명"}'
    result = parse_classification(raw)
    assert result["action"] == "route"
    assert result["prompt"] == "양자역학 설명"


def test_valid_tools_returns_unchanged():
    raw = '{"action": "tools", "tool": "calendar", "operation": "today", "params": {}}'
    result = parse_classification(raw)
    assert result["action"] == "tools"
    assert result["tool"] == "calendar"


def test_json_embedded_in_surrounding_text_extracts():
    raw = 'Sure! {"action": "direct", "response": "hi", "prompt": ""} Done.'
    assert parse_classification(raw)["action"] == "direct"


def test_empty_does_not_become_direct():
    """Regression: empty classifier output must NOT silently become a direct
    action. The old behavior caused the worker's direct branch to re-call the
    classifier with the user's message, leaking router JSON to chat."""
    assert parse_classification("")["action"] != "direct"


def test_non_json_text_does_not_become_direct():
    """Regression: raw natural-language text must NOT become a direct action
    that streams the raw text to the user. The classifier prompt biases the
    model toward JSON output, so non-JSON output is a malfunction signal."""
    assert parse_classification("이건 평문 답변이야.")["action"] != "direct"


# ---------- looks_like_router_json ----------


def test_router_json_with_action_route_detected():
    assert looks_like_router_json('{"action": "route", "response": "...", "prompt": "..."}') is True


def test_router_json_with_action_direct_detected():
    assert looks_like_router_json('{"action": "direct", "response": "hi", "prompt": ""}') is True


def test_router_json_with_action_tools_detected():
    text = '{"action": "tools", "tool": "calendar", "operation": "today", "params": {}}'
    assert looks_like_router_json(text) is True


def test_router_json_with_action_clarify_detected():
    assert looks_like_router_json('{"action": "clarify", "response": "어떤 의미?", "prompt": ""}') is True


def test_router_json_with_action_classification_failed_detected():
    assert looks_like_router_json('{"action": "classification_failed"}') is True


def test_natural_text_not_detected():
    assert looks_like_router_json("안녕하세요! 무엇을 도와드릴까요?") is False


def test_empty_string_not_detected():
    assert looks_like_router_json("") is False


def test_whitespace_only_not_detected():
    assert looks_like_router_json("   \n  ") is False


def test_text_with_braces_but_no_json_not_detected():
    assert looks_like_router_json("이건 {중괄호 가} 있는 자연어 답변이에요.") is False


def test_unrelated_json_not_detected():
    assert looks_like_router_json('{"name": "이드", "version": "1.0"}') is False


def test_json_with_two_router_keys_detected():
    """Even without an `action` field, two router-shaped keys signal leakage."""
    assert looks_like_router_json('{"prompt": "do x", "tool": "calendar"}') is True


def test_json_with_one_router_key_not_detected():
    """A single router-like key in otherwise-normal JSON should not trip the guard."""
    assert looks_like_router_json('{"prompt": "사용자가 입력한 prompt"}') is False


def test_code_fenced_router_json_detected():
    text = '```json\n{"action": "route", "response": "...", "prompt": "..."}\n```'
    assert looks_like_router_json(text) is True


def test_unknown_action_value_with_other_router_keys_detected():
    """Unknown action value but other router keys present → still leaks shape."""
    text = '{"action": "weird", "tool": "calendar", "operation": "today"}'
    assert looks_like_router_json(text) is True


def test_actual_bug_payload_detected():
    """Verbatim production leak (Synology Chat 2026-05-02 08:16:25)."""
    text = (
        '{"action": "route", "response": "사용자님의 깊은 감정이 담긴 글이네요. '
        '이 글을 바탕으로 질문에 답하기 위해서는 자세한 분석이 필요해요. '
        '추론 모델에게 전달할게요!", "prompt": "노래 가사를 분석해주세요."}'
    )
    assert looks_like_router_json(text) is True


# ---------- combined: normal direct path stays out of fallback ----------


def test_normal_direct_response_takes_direct_path():
    """Spec contract: a normal direct response with non-empty natural text
    must be classified `direct` AND survive the leak guard, so the worker's
    direct-path elif fires (not the chat_fallback branch)."""
    raw = '{"action": "direct", "response": "안녕하세요! 무엇을 도와드릴까요?", "prompt": ""}'
    parsed = parse_classification(raw)
    assert parsed["action"] == "direct"
    assert parsed["response"]
    assert looks_like_router_json(parsed["response"]) is False
    # The two assertions above together replicate the elif condition in
    # worker.py: action=="direct" and response_text and not router-shaped.