"""线索闭环 + 系统自审计集成测试（需 PostgreSQL）。

覆盖 R7/R17/R18/R19：线索生成与分级、状态流转、底稿、审计哈希链、线索不可删。
"""

from __future__ import annotations

import pytest
from sqlalchemy import text
from sqlalchemy.exc import InternalError, ProgrammingError

from app.audit import service as audit
from app.clues import service as clue_svc
from app.clues.models import ClueStatus, ConfidenceTier


def _new_clue(session, score=0.9):
    return clue_svc.create_clue(
        session,
        title="疑似政企拆单",
        risk_domain="收入",
        scenario_code="R8",
        score=score,
        rationale="8 个客户金额集中在审批阈值边缘，且法人关联同一实控人",
        evidence={"contracts": 8, "threshold": 1000000},
        amount_involved=4800000,
        actor="system",
    )


def test_score_to_confidence_tier():
    assert clue_svc.score_to_tier(0.9) == ConfidenceTier.HIGH
    assert clue_svc.score_to_tier(0.6) == ConfidenceTier.MEDIUM
    assert clue_svc.score_to_tier(0.2) == ConfidenceTier.LOW


def test_clue_full_lifecycle(session):
    clue = _new_clue(session)
    assert clue.confidence == ConfidenceTier.HIGH
    assert clue.status == ClueStatus.NEW

    clue_svc.assign(session, clue, assignee="auditor_zhang", actor="manager_li")
    assert clue.status == ClueStatus.ASSIGNED
    assert clue.assignee == "auditor_zhang"

    paper = clue_svc.adjudicate(session, clue, confirmed=True, actor="auditor_zhang", note="属实，移交")
    assert clue.status == ClueStatus.CONFIRMED
    assert clue.feedback == "confirmed"
    assert paper.conclusion == "confirmed"
    assert paper.snapshot["score"] == 0.9

    # 继续闭环：确认 -> 移交 -> 销项
    clue_svc.transition(session, clue, ClueStatus.TRANSFERRED, actor="manager_li")
    clue_svc.transition(session, clue, ClueStatus.CLOSED, actor="manager_li")
    assert clue.status == ClueStatus.CLOSED


def test_illegal_transition_rejected(session):
    clue = _new_clue(session)
    with pytest.raises(clue_svc.IllegalTransitionError):
        # NEW 不能直接到 CLOSED
        clue_svc.transition(session, clue, ClueStatus.CLOSED, actor="x")


def test_audit_hash_chain_integrity(session):
    _new_clue(session)
    clue = _new_clue(session)
    clue_svc.assign(session, clue, "auditor_zhang", "manager_li")
    ok, broken = audit.verify_chain(session)
    assert ok is True
    assert broken is None


def test_clue_cannot_be_deleted(session):
    """R19：数据库触发器禁止物理删除线索。"""
    clue = _new_clue(session)
    session.flush()
    with pytest.raises((InternalError, ProgrammingError)):
        session.execute(text("DELETE FROM clue WHERE id = :i"), {"i": clue.id})
        session.flush()


def test_list_clues_filters(session):
    _new_clue(session, score=0.9)
    _new_clue(session, score=0.3)
    highs = clue_svc.list_clues(session, confidence=ConfidenceTier.HIGH)
    assert all(c.confidence == ConfidenceTier.HIGH for c in highs)